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WO2024032080A1 - 一种无线通信方法、通信装置及通信系统 - Google Patents

一种无线通信方法、通信装置及通信系统 Download PDF

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Publication number
WO2024032080A1
WO2024032080A1 PCT/CN2023/095400 CN2023095400W WO2024032080A1 WO 2024032080 A1 WO2024032080 A1 WO 2024032080A1 CN 2023095400 W CN2023095400 W CN 2023095400W WO 2024032080 A1 WO2024032080 A1 WO 2024032080A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal device
access network
rrc
radio access
network device
Prior art date
Application number
PCT/CN2023/095400
Other languages
English (en)
French (fr)
Inventor
沙桐
李秉肇
张海森
常俊仁
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2024032080A1 publication Critical patent/WO2024032080A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes

Definitions

  • the present application relates to the field of communication technology, and in particular, to a wireless communication method, communication device and communication system.
  • RRC radio resource control
  • the amount of data to be transmitted by the terminal equipment in the RRC inactive state is less than
  • the terminal device may not enter the RRC connected state, but may transmit data and/or signaling with the radio access network device in the RRC inactive state. This process is called small data transfer.
  • Multicast communication means that the same service and the same data are provided to a specific group of terminal devices at the same time.
  • the network side can send multicast services to the terminal device in the RRC connected state through a multicast session.
  • the network side can let the terminal device enter the RRC idle state or RRC inactive state to save energy consumption of the terminal device.
  • the network side notifies the terminal device in the RRC idle state or RRC inactive state through the group notification mechanism.
  • the terminal device can re-establish a connection with the network side after receiving the group notification. to receive data from a multicast session. Once the end device leaves the multicast session, the end device may stop monitoring group notifications related to the multicast session.
  • the network side pages a terminal device that has joined the multicast session and is in the RRC inactive state.
  • the terminal device may be in the process of transmitting small data, or it may not be in the process of transmitting small data. transmission process.
  • the specific operations that the terminal device needs to perform remain to be resolved.
  • Embodiments of the present application provide a wireless communication method, communication device, and communication system to ensure that terminal equipment saves unnecessary energy consumption during small data transmission, reduces terminal equipment processing complexity, and reduces signaling overhead.
  • embodiments of the present application provide a wireless communication method, which can be executed by a first terminal device or a module (such as a chip) applied to the first terminal device.
  • the method includes: a first terminal device receives a paging message, the paging message includes identification information of at least one multicast session, and the first terminal device is in an RRC inactive state; when the first condition is met, the first terminal device triggers RRC connection recovery process; wherein the first condition includes: the at least one multicast session includes a multicast session joined by the first terminal device, and the first terminal device is not in the process of small data transmission; or, the third One condition includes: the paging message also includes identification information of at least one terminal device, and the The at least one multicast session includes the multicast session joined by the first terminal device, the terminal device is not in the process of small data transmission, and the identification information of the at least one terminal device does not include the identification information of the first terminal device; the The small data transmission is the data and/or signaling transmission by the first terminal
  • the first terminal device if at least one multicast session in the paging message sent by the network side contains a multicast session joined by the first terminal device, it indicates that the network side has multicast session data that needs to be sent to the first terminal device.
  • the first terminal device You can request the network side to restore the RRC connection to receive data of the multicast session.
  • the first terminal device is currently in the process of small data transmission after receiving the paging message, it means that the first terminal device has sent an RRC recovery request message to the network side before receiving the paging message.
  • the radio access network device There is an available data/signaling transmission path with the first terminal device.
  • the wireless access network device knows the cell where the first terminal device resides.
  • the RRC recovery message can be sent to the first terminal device through the transmission path. Therefore, after receiving the paging message, if the first terminal device is currently in the process of small data transmission, it does not need to send an RRC recovery request message to the network side again, but can wait for the network side device to send an RRC recovery message.
  • the RRC recovery message may be in response to an RRC recovery request message sent by the first terminal device when triggering small data transmission, thereby saving unnecessary energy consumption, reducing processing complexity of the terminal device, and reducing signaling overhead.
  • the first terminal device triggers an RRC connection recovery process, including: the first terminal device sends an RRC recovery request message to the radio access network device.
  • the first terminal device determines not to trigger the RRC connection recovery process; wherein the second condition includes: the at least one multicast session includes the A multicast session is established, and the first terminal device is in the process of transmitting small data.
  • the radio access network device knows the cell where the first terminal device resides. Therefore, after receiving the paging message used to notify the activation of the multicast session, the first terminal device does not need to trigger RRC connection recovery. process, but waits for the wireless access network device to send an RRC recovery message to the first terminal device to make the first terminal device enter the RRC connection state, thereby saving unnecessary energy consumption, reducing the processing complexity of the terminal device, and reducing signaling. overhead.
  • the first terminal device sends indication information to the radio access network device.
  • the indication information indicates that data and/or signaling has arrived on the wireless bearer for non-small data transmission, or that the at least one multicast
  • the session includes the multicast session joined by the first terminal device, or the multicast session joined by the first terminal device has been activated.
  • the radio access network device can learn that the first terminal device has data or signaling arriving on the wireless bearer for non-small data transmission, or learn that the first terminal device desires to enter the RRC connection.
  • Receiving the multicast session in the state helps the wireless access network device determine whether to restore the first terminal device to the RRC connection state, which facilitates subsequent correct communication between the wireless access network device and the first terminal device. For example, if the first terminal device does not expect to enter the RRC connected state to receive the multicast session indicated in the paging message after receiving the paging message, or the multicast session has been released, the first terminal device may not send a request to the RRC connection state. When the radio access network device sends the indication information, the radio access network device does not need to let the first terminal device enter the RRC connection state.
  • the first terminal device when the third condition is met, enters the RRC idle state and triggers the RRC connection establishment process; wherein the third condition includes: the paging message also includes an identity of at least one terminal device.
  • the at least one multicast session includes the multicast session joined by the first terminal device, the terminal device is not in the process of small data transmission, and the identification information of the at least one terminal device includes the identification information of the first terminal device .
  • embodiments of the present application provide a wireless communication method, which can be executed by a terminal device or a module (such as a chip) applied to the terminal device.
  • the method includes: a terminal device determines whether to monitor a paging message for group notification based on the status of small data transmission, the terminal device is in an RRC inactive state, and the paging message contains identification information of at least one multicast session; wherein, The terminal device has joined one or more multicast sessions, and the small data transmission is a data and/or signaling transmission performed by the first terminal device in the RRC inactive state with a data amount lower than a preset threshold.
  • the terminal device decides to listen to the paging message for group notification or not to listen to the paging message for group notification according to the status of small data transmission, instead of always listening to the paging message for group notification, which helps to save money. Eliminate unnecessary energy consumption overhead, reduce the processing complexity of terminal equipment, and reduce signaling overhead.
  • the terminal device determines whether to monitor the paging message for group notification based on the status of small data transmission, including: when the terminal device is not transmitting small data, the terminal device monitors the paging message. .
  • the terminal device in the RRC inactive state when the terminal device in the RRC inactive state is not transmitting small data, it means that the wireless access network device does not know which cell the terminal device resides on, and there is no available link between the terminal device and the wireless access network device. Data/signaling path, so the terminal device needs to promptly determine whether the network side has sent a paging message to notify the activated multicast session by monitoring paging, so as to ensure that the data of the multicast session can be received in a timely manner.
  • the terminal device determines whether to monitor the paging message for group notification based on the status of small data transmission, including: when the terminal device is transmitting small data, the terminal device does not monitor the paging message. information.
  • the terminal device if the terminal device is currently in the process of transmitting small data, it means that the wireless access network device knows which cell the terminal device resides in, and there is an available data/signaling path between the terminal device and the wireless access network device.
  • the terminal device has already sent an RRC recovery request message to the network side. Therefore, if the network side needs to let the terminal device enter the RRC connection state to receive the multicast session, it can send an RRC recovery message to the terminal device. Therefore, the terminal device does not need to listen to notify the group. It broadcasts the paging message for which the session has been activated without decoding the data blocks on the physical downlink shared channel (PDSCH) carrying the paging message, thus saving unnecessary energy consumption and reducing the processing complexity of the terminal equipment. Reduce signaling overhead.
  • PDSCH physical downlink shared channel
  • the terminal device if the terminal device is transmitting small data, the paging message will not be monitored, including: when the terminal device is transmitting small data, and the terminal device does not support multicast reception in the RRC inactive state. session, the terminal device does not monitor the paging message.
  • the terminal device if the terminal device is currently in the process of small data transmission, it means that the wireless access network device knows which cell the terminal device resides on, and there is an available data/signaling path between the terminal device and the wireless access network device.
  • the terminal device has already sent an RRC recovery request message to the network side. Therefore, if the network side needs to let the terminal device enter the RRC connection state to receive the multicast session, it can send an RRC recovery message to the terminal device. And because the terminal device does not support receiving multicast sessions in the RRC inactive state, the terminal device needs to enter the RRC connected state before receiving the data of the multicast session. Therefore, the terminal device does not need to listen to the pager used to notify that the multicast session has been activated.
  • this solution can save unnecessary energy consumption, reduce the processing complexity of the terminal device, and reduce Signaling overhead.
  • the terminal device receives an RRC message, the RRC message includes identification information of the at least one multicast session, and the RRC message is used to notify that the at least one multicast session has been activated; when the at least one group The multicast session includes the multicast session joined by the terminal device, and the terminal device receives the multicast session joined by the terminal device in the RRC inactive state.
  • the RRC message also instructs the terminal device to remain in the RRC inactive state to receive the multicast session.
  • the paging message used for group notification is a broadcast message.
  • the paging message is sent in the initial bandwidth part. part, BWP). If the sum of the current BWP bandwidth range of the terminal device for small data transmission and the bandwidth range of the initial BWP exceeds the bandwidth supported by the terminal device (for example, the terminal device is a low-capacity terminal device), the terminal device cannot transmit and receive small data at the same time. Call message. If the terminal device wants to receive group paging during small data transmission, it needs to switch the BWP to the initial BWP to receive group paging, which will cause data packet loss during small data transmission.
  • the terminal device can receive the notification that the multicast session has been activated through dedicated signaling (ie, RRC message) on the BWP of small data transmission, instead of notifying that the multicast session has been activated through the paging message, so There is no need to perform BWP switching, packet loss can be avoided, and the implementation complexity of the terminal device can be reduced.
  • dedicated signaling ie, RRC message
  • the terminal device determines whether to listen to the paging message for group notification based on the status of small data transmission, including: when the terminal device is transmitting small data and the terminal device supports inactive RRC If the multicast session is received in a state, the terminal device monitors the paging message.
  • the terminal device If the terminal device is currently in the process of small data transmission, it means that the wireless access network device knows which cell the terminal device resides in, there is an available data/signaling path between the terminal device and the wireless access network device, and the terminal device has An RRC recovery request message has been sent to the network side. Therefore, if the network side needs to allow the terminal device to enter the RRC connection state to receive the multicast session, it can send an RRC recovery message to the terminal device to trigger the terminal device to enter the RRC connection state to receive the multicast session. Therefore, in general, the terminal device does not need to listen to the paging message used to notify that the multicast session has been activated, and only needs to wait for the RRC recovery message sent by the radio access network device.
  • the terminal device needs to monitor the paging message. This is because: the terminal device supports When receiving a multicast session in the RRC inactive state, the wireless access network device may not send an RRC recovery message to the terminal device to trigger the terminal device to enter the RRC connected state and receive multicast session data in the RRC connected state. Therefore, the terminal device needs to actively Monitor paging messages to know whether the multicast session has been activated to avoid missing the multicast session data sent by the network. When the terminal device monitors that the multicast session has been activated, it can receive multicast in the RRC inactive state. Session data.
  • the terminal device when the terminal device is transmitting small data and the terminal device supports receiving the multicast session in the RRC inactive state, the terminal device monitors the paging message, including: when the terminal device is transmitting small data. For data transmission, if the terminal device supports receiving multicast sessions in the RRC inactive state, and the cell where the terminal device resides supports providing multicast sessions for terminal devices in the inactive state, then the terminal device monitors the paging message.
  • embodiments of the present application provide a wireless communication method, which can be executed by a terminal device or a module (such as a chip) applied to the terminal device.
  • the method includes: a terminal device receives a first message, the first message includes identification information of at least one multicast session, and the terminal device is in an RRC inactive state; when the at least one multicast session includes a multicast to which the terminal device joins session, and the terminal device is in the process of small data transmission, the terminal device enters the RRC idle state and triggers the RRC connection establishment process; where the small data transmission is performed by the terminal device in the RRC inactive state.
  • the amount of data is lower than the preset Threshold data and/or signaling transmission.
  • At least one multicast session in the first message sent by the network side contains a multicast session joined by the terminal device, it indicates that the network side has multicast session data that needs to be sent to the terminal device, and the terminal device can request recovery from the network side.
  • RRC connection to receive data for the multicast session.
  • the terminal device is currently in the process of small data transmission after receiving the paging message, it means that the wireless access network device knows which cell the terminal device resides on, and there is an available link between the terminal device and the wireless access network device.
  • the terminal device has sent the paging message to the network side before receiving the paging message
  • the network side needs to let the terminal device enter the RRC connection state to receive the multicast session, it can send the RRC recovery message to the terminal device. Therefore, after receiving the paging message, if the terminal device is currently in the process of small data transmission, it does not need to send the RRC recovery request message to the network side again. Instead, it can directly enter the RRC idle state and trigger the RRC connection establishment process, so that it can It can quickly enter the RRC connection state and receive multicast session data, save unnecessary energy consumption, reduce the processing complexity of terminal equipment, and reduce signaling overhead.
  • the first message is an RRC message or a paging message.
  • embodiments of the present application provide a wireless communication method, which can be executed by a first radio access network device or a module (such as a chip) applied to the first radio access network device.
  • the method includes: a first radio access network device sending a second paging message indicating at least one multicast session activation; the first radio access network device receiving an indication from a first terminal device Information, the indication information includes a data indication indicating non-small data transmission, and/or a multicast cause value; wherein the at least one multicast session includes a multicast session joined by the first terminal device, and the first
  • the terminal device is in a radio resource control (RRC) inactive state and is in a small data transmission process; the first radio access network device is a serving radio access network device of the first terminal device.
  • RRC radio resource control
  • the first radio access network device can learn that the first terminal device has data arriving on the wireless bearer for non-small data transmission or learn that the first terminal device expects to enter the RRC connection state for reception.
  • the multicast session helps the first radio access network device determine whether to restore the RRC connection state of the first terminal device, and facilitates subsequent correct communication between the first radio access network device and the first terminal device, such as the first terminal.
  • the device receives multicast sessions in RRC connected state.
  • the first radio access network device after the first radio access network device receives the indication information from the first terminal device, it further includes: the first radio access network device sends an RRC recovery to the first terminal device. message, the RRC recovery message is used to recover the RRC connection of the first terminal device.
  • the method before the first radio access network device sends an RRC recovery message to the first terminal device, the method further includes: the first radio access network device sends an RRC recovery message to the first terminal device.
  • RRC release message the RRC release message is used to instruct the first terminal device to enter the RRC inactive state or the RRC idle state;
  • the first radio access network device receives the RRC recovery request message from the first terminal device , the RRC recovery request message is used to request to enter the RRC connection state; or, the first radio access network device receives an RRC establishment request message from the first terminal device, and the RRC establishment request message is used to request the establishment RRC connection.
  • the second paging message is also used to instruct the terminal device in the RRC connected state to receive the at least one multicast session; or, the second paging message is also used to instruct the At least one multicast session is a multicast session received by the terminal device in RRC connected state or RRC non-connected state.
  • the method before the first radio access network device sends the second paging message, the method further includes: the first radio access network device receives the first paging message, and the first paging message is The message is used to notify one or more multicast session activations; the second paging message is determined according to the first paging message.
  • the first radio access network device receiving the first paging message includes: the first radio access network device receiving all paging messages from the second radio access network device or the core network device.
  • the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the first paging message also includes information for paging a terminal device; the first wireless access network device sends a second paging message, including: the first wireless The access network device sends the second paging message according to the information for paging the terminal device.
  • the multicast cause value indicates that the at least one multicast session includes a multicast session joined by the first terminal device, or indicates that the multicast session joined by the first terminal device is activated. , or instruct the first terminal device to enter the RRC connected state to receive multicast.
  • the first radio access network device after the first radio access network device receives the instruction information from the first terminal device, it further includes: the first radio access network device sends context to the second radio access network device.
  • Request message the context request message is used to request the terminal device context of the first terminal device, and the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the first radio access network device receives the terminal device context of the first terminal device from the second radio access network device.
  • embodiments of the present application provide a wireless communication method, which can be executed by a first radio access network device or a module (such as a chip) applied to the first radio access network device.
  • the method includes: a first radio access network device receives a first paging message, the first paging message includes identifiers of one or more multicast sessions, and the first paging message is used to notify the one Or multiple multicast sessions are activated, and the first radio access network device is a first terminal device serving a radio access network device; wherein the first terminal device is in a radio resource control (RRC) inactive state and is in small data transmission Process; the first radio access network device obtains the multicast-related context of the first terminal device, and the multicast-related context includes an identifier of the multicast session joined by the first terminal device; The first radio access network device sends an RRC recovery message to the first terminal device.
  • the identifiers of the one or more multicast sessions include the identifiers of the multicast sessions joined by the first terminal device
  • the first radio access network device learns that the activated multicast session includes the multicast session joined by the first terminal device, and then restores the RRC connection of the first terminal device through the RRC recovery message, that is, the terminal device restores the RRC connection. state to facilitate subsequent correct communication between the first radio access network device and the first terminal device, for example, the first terminal device receives a multicast session in the RRC connected state.
  • the first radio access network device before the first radio access network device sends an RRC recovery message to the first terminal device, it further includes: determining a second paging message according to the first paging message, so The second paging message indicates activation of at least one multicast session, and the at least one multicast session includes the multicast session joined by the first terminal device; and the second paging message is sent.
  • the method before the first radio access network device sends an RRC recovery message to the first terminal device, the method further includes: the first radio access network device sends an RRC recovery message to the first terminal device.
  • RRC release message the RRC release message is used to instruct the first terminal device to enter the RRC inactive state or the RRC idle state;
  • the first radio access network device receives the RRC recovery request message from the first terminal device , the RRC recovery request message is used to request to enter the RRC connection state; or, the first radio access network device receives an RRC establishment request message from the first terminal device, and the RRC establishment request message is used to request the establishment RRC connection.
  • the first radio access network device receiving the first paging message includes: the first radio access network device receiving all paging messages from the second radio access network device or the core network device.
  • the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the first radio access network device obtains the multicast-related context of the first terminal device, including: the first radio access network device transmits the information to the second radio access network device.
  • Send a first context request message the first context request message is used to request to obtain the context of the first terminal device for small data transmission;
  • the first radio access network device receives data from the second radio access network Partial context of the first terminal device of the device. Partial context of the first terminal device includes context related to small data transmission and context related to the multicast.
  • Context the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the method further includes: the first radio access network device sending a second context request message to the second radio access network device, the second context request message being used to request Obtain the context of the first terminal device; the first radio access network device receives the terminal device context of the first terminal device from the second radio access network device.
  • the first radio access network device obtains the multicast-related context of the first terminal device, including: the first radio access network device receives a multicast message from the second radio access network device.
  • the terminal device context of the first terminal device, the terminal device context includes the multicast-related context, and the second radio access network device is the last serving radio of the first terminal device in the RRC connected state. Access network equipment.
  • embodiments of the present application provide a wireless communication method, which can be executed by a second radio access network device or a module (such as a chip) applied to the second radio access network device.
  • the method includes: the second radio access network device determines whether the identifier of the activated one or more multicast sessions includes the identifier of the multicast session joined by the first terminal device; when the activated one or more multicast sessions The identifier includes the identifier of the multicast session joined by the first terminal device, and the second radio access network device sends the terminal device context of the first terminal device to the first radio access network device; wherein,
  • the first terminal device is in a radio resource control (RRC) inactive state and is in a small data transmission process;
  • the first radio access network device is a serving radio access network device of the first terminal device;
  • the second radio access network device is a serving radio access network device of the first terminal device.
  • the network access device is the last serving radio access network device of the first terminal device in the RRC connection state.
  • the second radio access network device learns that the activated multicast session includes the multicast session joined by the first terminal device, and then sends the context of the first terminal device to the first radio access network device to facilitate the first radio access network device.
  • the network access device learns that the multicast session joined by the first terminal device has been activated, and then the first radio access network device can restore the terminal device to the RRC connection state to facilitate subsequent communication between the first radio access network device and the first terminal device. Correct communication between devices, such as the first terminal device receiving a multicast session in the RRC connected state.
  • the terminal device context includes a multicast-related context of the first terminal device.
  • the method before the second radio access network device sends the terminal device context of the first terminal device to the first radio access network device, the method further includes: the second radio access network device Receive a context request message from the first radio access network device, the context request message is used to request to obtain the context of the terminal device for small data transmission; the second radio access network device sends a request to the first radio access network device.
  • the radio access network device sends the partial context of the first terminal device, where the partial context of the first terminal device includes context related to small data transmission.
  • the method further includes: the second radio access network device sending a first paging message to the first radio access network device, the first paging message being used to notify The one or more multicast sessions are activated.
  • the first paging message includes identifiers of the one or more multicast sessions.
  • embodiments of the present application provide a wireless communication method, which can be executed by a first terminal device or a module (such as a chip) applied to the first terminal device.
  • the method includes: a first terminal device receiving a second paging message from a first wireless access network device, the second paging message indicating at least one multicast session activation; the first terminal device sending a message to the first wireless access network device.
  • the network access device sends indication information, where the indication information includes a non-small data transmission data indication and/or a multicast cause value; wherein the at least one multicast session includes a multicast session joined by the first terminal device,
  • the first terminal device is in a radio resource control (RRC) inactive state and is in a small data transmission process; the first radio access network device is a serving radio access network device of the first terminal device.
  • RRC radio resource control
  • the first terminal device sends indication information to the first wireless access network device, so that the first wireless access network device learns or learns that the first terminal device has data arriving on the wireless bearer for non-small data transmission based on the indication information.
  • the first terminal device expects to enter the RRC connection state to receive the multicast session, which will help the first radio access network device determine whether to let the first terminal device restore the RRC connection state, and facilitate the subsequent communication between the first radio access network device and the first terminal device. Correct communication between them, such as the first terminal device receiving a multicast session in the RRC connected state.
  • the method further includes: the first terminal device receiving RRC recovery from the first radio access network device. message, the RRC recovery message is used to recover the RRC connection of the first terminal device.
  • the method before the first terminal device receives the RRC recovery message from the first radio access network device, the method further includes: the first terminal device receives the RRC recovery message from the first radio access network device.
  • RRC release message of the device the RRC release message is used to instruct the first terminal device to enter the RRC inactive state or the RRC idle state;
  • the first terminal device sends an RRC recovery request to the first radio access network device message, the RRC recovery request message is used to request to enter the RRC connection state; or the first terminal device sends an RRC establishment request message to the first radio access network device, the RRC establishment request message is used to request the establishment RRC connection.
  • the second paging message is also used to instruct the terminal device in the RRC connected state to receive the at least one multicast session; or, the second paging message is also used to instruct the At least one multicast session is a multicast session received by the terminal device in RRC connected state or RRC non-connected state.
  • the multicast cause value indicates that the at least one multicast session includes a multicast session joined by the first terminal device, or indicates that the multicast session joined by the first terminal device is activated. , or instruct the first terminal device to enter the RRC connected state to receive multicast.
  • embodiments of the present application provide a communication device, which may be a terminal device or a module (such as a chip) applied in the terminal device.
  • the device has the function of implementing any implementation method of the above-mentioned first to seventh aspects. This function can be implemented by hardware, or it can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • embodiments of the present application provide a communication device, including a processor coupled to a memory.
  • the processor is configured to call a program stored in the memory to execute any implementation method in the above first to seventh aspects.
  • the memory may be located within the device or external to the device.
  • the processor can be one or more.
  • embodiments of the present application provide a communication device, including a processor and a memory; the memory is used to store computer instructions, and when the device is running, the processor executes the computer instructions stored in the memory, so that the device executes Any implementation method in the above first to seventh aspects.
  • embodiments of the present application provide a communication device, including units or means for executing each step of any implementation method in the above-mentioned first to seventh aspects.
  • embodiments of the present application provide a communication device, including a processor and an interface circuit.
  • the processor is configured to communicate with other devices through the interface circuit and perform any implementation method in the above-mentioned first to seventh aspects.
  • the processor includes one or more.
  • embodiments of the present application further provide a chip system, including: a processor, configured to execute any implementation method in the above-mentioned first to seventh aspects.
  • embodiments of the present application further provide a computer-readable storage medium, in which instructions are stored, which, when run on a communication device, enable the above-described first to seventh aspects. Any implementation method of is executed.
  • embodiments of the present application further provide a computer program product.
  • the computer program product includes a computer program or instructions.
  • the computer program or instructions are run by a communication device, any one of the above-mentioned first to seventh aspects is enabled.
  • the implementation method is executed.
  • embodiments of the present application provide a communication system, including a first terminal device and a radio access network device.
  • the first terminal device is used for paging messages, the paging message includes identification information of at least one multicast session, and the first terminal device is in the RRC inactive state; when the first condition is met, the RRC connection recovery process is triggered; the The radio access network device is configured to send an RRC recovery message to the first terminal device.
  • the RRC recovery message is used to trigger the first terminal device to enter the RRC connected state; wherein the first condition includes: the at least one multicast session contains the multicast session joined by the first terminal device, and the first terminal device is not in the process of small data transmission; or, the first condition includes: the paging message also includes identification information of at least one terminal device, the The at least one multicast session includes the multicast session joined by the first terminal device, the terminal device is not in the process of small data transmission, and the identification information of the at least one terminal device does not include the identification information of the first terminal device; the The small data transmission is the data and/or signaling transmission by the first terminal device in the RRC inactive state with a data amount lower than a preset threshold.
  • the first terminal device is specifically configured to send an RRC recovery request message to the radio access network device.
  • the first terminal device is further configured to determine not to trigger the RRC connection recovery process when a second condition is met; wherein the second condition includes: the at least one multicast session contains the first The terminal device joins the multicast session, and the first terminal device is in the process of transmitting small data.
  • the first terminal device is also configured to send indication information to the radio access network device, the indication information indicating that data and/or signaling has arrived on the radio bearer for non-small data transmission, or the At least one multicast session includes a multicast session to which the first terminal device joins.
  • the first terminal device is also configured to enter the RRC idle state and trigger the RRC connection establishment process when a third condition is met; wherein the third condition includes: the paging message also includes at least one The identification information of the terminal device, the at least one multicast session includes the multicast session joined by the first terminal device, the terminal device is not in the process of small data transmission, and the identification information of the at least one terminal device includes the first terminal Identification information of the device.
  • embodiments of the present application provide a communication system, including a terminal device and a wireless access network device.
  • the radio access network device is configured to send a first message to the terminal device, where the first message includes identification information of at least one multicast session, and the terminal device is in an RRC inactive state; the terminal device is configured to when the at least A multicast session includes a multicast session joined by the terminal device, and the terminal device is in the process of small data transmission, enters the RRC idle state and triggers the RRC connection establishment process; wherein, the small data transmission is for the terminal device in the RRC non-RRC state.
  • the active state transmits data and/or signaling whose data amount is lower than the preset threshold.
  • the first message is an RRC message or a paging message.
  • embodiments of the present application provide a communication system, which includes a first radio access network device for implementing any method of the fourth aspect, and a first radio access network device for implementing any of the methods of the seventh aspect.
  • First terminal device for implementing any of the methods of the seventh aspect.
  • embodiments of the present application provide a communication system, which includes a first terminal device and a first radio access network device for implementing any of the methods described in the fifth aspect.
  • the first terminal device is configured to receive an RRC recovery message, and the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • embodiments of the present application provide a communication system, which includes a first radio access network device and a second radio access network device for implementing any of the methods described in the sixth aspect.
  • the first radio access network device is used for receiving the terminal device context of the first terminal device.
  • Figure 1 is a schematic diagram of the architecture of a communication system applied in an embodiment of the present application
  • Figure 2 is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3 is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3(a) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3(b) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3(c) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3(d) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3(e) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 3(f) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • Figure 5 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • FIG 1 is a schematic architectural diagram of a communication system applied in an embodiment of the present application.
  • the communication system 1000 includes a wireless access network 100 and a core network 200.
  • the communication system 1000 also includes the Internet 300.
  • the radio access network 100 may include at least one radio access network device, such as 110a and 110b in Figure 1, and may also include at least one terminal device, such as 120a-120j in Figure 1.
  • 110a is a base station
  • 110b is a micro station
  • 120a, 120e, 120f and 120j are mobile phones
  • 120b is a car
  • 120c is a gas pump
  • 120d is a home access point (HAP) arranged indoors or outdoors.
  • 120g is a laptop
  • 120h is a printer
  • 120i is a drone.
  • the same terminal device or wireless access network device can provide different functions in different application scenarios.
  • the mobile phones in Figure 1 include 120a, 120e, 120f and 120j.
  • Mobile phone 120a can access the base station 110a, connect to the car 120b, directly communicate with the mobile phone 120e and access the HAP.
  • the mobile phone 120b can access the HAP and communicate with the mobile phone 120a.
  • mobile phone 120f can be connected as micro station 110b, connected to laptop 120g, connected to printer 120h, and mobile phone 120j can control drone 120i.
  • the terminal equipment is connected to the wireless access network equipment, and the wireless access network equipment is connected to the core network.
  • the core network equipment and the radio access network equipment can be independent and different physical devices, or the functions of the core network equipment and the logical functions of the radio access network equipment can be integrated on the same physical device, or they can be one physical device. It integrates the functions of some core network equipment and some functions of wireless access network equipment.
  • Terminal devices and terminal devices and wireless access network devices and wireless access network devices may be connected to each other in a wired or wireless manner.
  • Figure 1 is only a schematic diagram.
  • the communication system may also include other network equipment, such as wireless relay equipment and wireless backhaul equipment, which are not shown in Figure 1 .
  • the radio access network equipment may be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a transmission reception point (TRP), or the next generation in the fifth generation (5th generation, 5G) mobile communication system.
  • Base stations nodeB, gNB
  • base stations in sixth generation (6th generation, 6G) mobile communication systems base stations in future mobile communication systems or access nodes in wireless fidelity (WiFi) systems, etc.
  • WiFi wireless fidelity
  • It can also be a module or unit that completes some functions of the base station. For example, it can be a centralized unit. (central unit, CU), or distributed unit (DU).
  • the wireless access network equipment may be a macro base station (110a in Figure 1), a micro base station or an indoor station (110b in Figure 1), or a relay node or donor node.
  • the embodiments of this application do not limit the specific technology and specific equipment form used by the wireless access network equipment.
  • Terminal equipment can also be called terminal, user equipment (UE), mobile station, mobile terminal, etc.
  • Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), and the Internet of Things (internet of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc.
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the terminal equipment.
  • Wireless access network equipment and terminal equipment can be fixed-position or removable. Wireless access network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the sky. The embodiments of this application do not limit the application scenarios of wireless access network equipment and terminal equipment.
  • radio access network equipment and terminal equipment may be relative.
  • the helicopter or drone 120i in Figure 1 may be configured as a mobile base station, for those terminal equipment 120j that accesses the radio access network 100 through 120i.
  • the terminal device 120i is a base station; but for the base station 110a, 120i is a terminal device, that is, communication between 110a and 120i is through a wireless air interface protocol.
  • communication between 110a and 120i can also be carried out through an interface protocol between base stations.
  • relative to 110a, 120i is also a base station. Therefore, both wireless access network equipment and terminal equipment can be collectively called communication devices.
  • 110a and 110b in Figure 1 can be called communication devices with the function of wireless access network equipment.
  • 120a-120j in Figure 1 can be called communication devices with the function of wireless access network equipment.
  • the functions of the wireless access network equipment can also be executed by modules (such as chips) in the wireless access network equipment, or can also be executed by a control subsystem that includes the functions of the wireless access network equipment.
  • the control subsystem here that contains wireless access network equipment functions can be the control center in the above application scenarios such as smart grid, industrial control, smart transportation, smart city, etc.
  • the functions of the terminal equipment can also be performed by modules in the terminal equipment (such as chips or modems), or can be performed by devices containing the functions of the terminal equipment.
  • RRC radio resource control
  • an RRC connection is established between the terminal device and the wireless access network device, and data can be transmitted between the terminal device and the wireless access network device.
  • the radio access network device can release the terminal device to the RRC idle state or the RRC inactive state.
  • the wireless access network device suspends the RRC connection and maintains the context information of the terminal device. Later, when it is necessary to restore to the RRC connection state, because the wireless access network equipment maintains the terminal equipment's With the following information, the terminal device can quickly restore to the RRC connection state.
  • the network can broadcast and send a paging message. After the terminal device receives the paging message, it can determine the content of the paging message. Whether to contain the identification information of the terminal device. If included, it indicates that the network is paging the terminal device, so the terminal device can trigger the establishment of an RRC connection and enter the RRC connection state.
  • the core network paging that is, the core network sends paging messages within the tracking area (tracking area, TA) indicated by the tracking area identity (TAI) list.
  • the TAI list includes one or more TAIs, one TAI identifies one TA, and one TA includes one or more cells. This paging message is also called a core network paging message.
  • RNA paging that is, the radio access network device sends paging messages within the range of RNA.
  • an RNA includes one or more cells, and the range of RNA is smaller than the range of TA.
  • This paging message is also called a RAN paging message or an RNA paging message.
  • the amount of data to be transmitted by the terminal equipment in the RRC inactive state is less than
  • the terminal device may not enter the RRC connected state, but may transmit data and/or signaling with the radio access network device in the RRC inactive state.
  • This process is called small data transfer. That is, small data transmission refers to the data and/or signaling transmission by the terminal device in the RRC inactive state with a data amount lower than a preset threshold.
  • the methods of small data transmission include but are not limited to the following two methods.
  • Method one is to transmit small data through the random access channel (RACH) process.
  • RACH random access channel
  • the terminal device can send uplink small data (also called SDT UL data) to the radio access network device in MSG3, and also send an RRC recovery request ( RRCResumeRequest) message.
  • uplink small data also called SDT UL data
  • RRCResumeRequest an RRC recovery request
  • the terminal device can send uplink small data to the radio access network device in MSGA, and also send an RRC recovery request message in MSGA.
  • Method two is to transmit small data through preconfigured grant (CG) resources.
  • CG preconfigured grant
  • the terminal device sends uplink small data to the radio access network device through CG resources, and also sends an RRC recovery request message.
  • the CG resource is configured by the radio access network device to the terminal device through an RRC release (RRCRelease) message.
  • the RRC recovery request message sent by the terminal device to the radio access network device is used to trigger RRC connection recovery for small data transmission.
  • the above small data transmission scheme allows terminal equipment in the RRC inactive state to send small data without entering the RRC connected state, reducing the risk of terminal equipment entering the RRC connected state for data transmission with a small amount of data. energy consumption expenses.
  • Multicast communication means that the same service and the same data are provided to a specific group of terminal devices at the same time.
  • the network side can send multicast services to the terminal device in the RRC connected state through a multicast session.
  • the network side can let the terminal device enter the RRC idle state or RRC inactive state to save energy consumption of the terminal device.
  • the network side The notification mechanism notifies terminal equipment in the RRC idle state or RRC inactive state. After receiving the group notification, the terminal equipment can re-establish a connection with the network side to receive multicast session data. Once the end device leaves the multicast session, the end device may stop monitoring group notifications related to the multicast session.
  • the network side pages a terminal device that has joined the multicast session and is in the RRC inactive state.
  • the terminal device may be in the process of transmitting small data, or it may not be in the process of transmitting small data. transmission process.
  • the specific operations that the terminal device needs to perform remain to be resolved.
  • FIG. 2 is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Step 201 The first terminal device receives a paging message.
  • the first terminal device is in an RRC inactive state.
  • the paging message is a paging message used for group notification.
  • the paging message contains identification information of at least one multicast session and notifies the terminal device of the activated multicast session.
  • the wireless access network device can use the group notification method to join the multicast session.
  • the terminal device in the RRC inactive state sends a paging message to notify the multicast session of activation.
  • the identification information of the multicast session in the paging message may indicate a specific multicast service within a specific public land mobile network (public land mobile network, PLMN).
  • the multicast session may be a multicast broadcast service (MBS) multicast session
  • the identification information of the multicast session may be a temporary mobile group identifier (TMGI).
  • Step 202 When the first condition is met, the first terminal device triggers the RRC connection recovery process.
  • the first condition includes: at least one multicast session in the paging message includes a multicast session joined by the first terminal device, and the first terminal device is not in the process of small data transmission (SDT procedure is not on-going).
  • the above-mentioned at least one multicast session includes a multicast session joined by the first terminal device, indicating that one or some multicast sessions joined by the first terminal device have been activated, or it is understood that there is data of the multicast session on the network side. needs to be sent to the first terminal device.
  • "not in the process of small data transmission” means that small data transmission is not currently performed, and both have the same meaning. In the process of small data transmission, it means that small data transmission is currently in progress, and they have the same meaning. A unified description is given here and will not be described in detail later.
  • the paging message includes TMGI_1, TMGI_2, TMGI_3 and TMGI_4, indicating that the multicast session identified by TMGI_1, TMGI_2, TMGI_3 and TMGI_4 has been activated. If the identification information of the multicast session that UE_1 has joined includes TMGI_5 and TMGI_6, then at least one multicast session in the paging message does not include the multicast session joined by the first terminal device, indicating that the network side does not need to send data for the multicast session. Give this UE_1.
  • the identification information of the multicast session that UE_1 has joined includes TMGI_1 and TMGI_6, then at least one multicast session in the paging message contains the multicast session joined by the first terminal device, indicating that the network side has multicast session data that needs to be sent to The UE_1. Specifically, the network side needs to send the data of the multicast session identified by TMGI_1 to UE_1.
  • the first terminal device triggers the RRC connection recovery process. Specifically, the first terminal device sends an RRC recovery request message to the radio access network device to request recovery from the RRC inactive state to the RRC connected state. After receiving the RRC recovery request message, the radio access network device may send the RRC recovery message to the first terminal device to trigger the first terminal device to recover from the RRC inactive state to the RRC connected state.
  • the wireless access network device knows the cell where the first terminal device resides.
  • the network side needs to let the first terminal device enter the RRC connection state to receive the multicast session, it can send the signal to the first terminal device through this transmission path.
  • the terminal device sends an RRC recovery message. Therefore, after receiving the paging message, if the first terminal device is currently in the process of small data transmission, it does not need to send an RRC recovery request message to the network side again, but can wait for the network side device to send an RRC recovery message.
  • the RRC recovery message The message may be in response to an RRC recovery request message sent by the first terminal device when triggering small data transmission, thereby saving unnecessary energy consumption, reducing processing complexity of the terminal device, and reducing signaling overhead.
  • the paging message further includes identification information of at least one terminal device, and the at least one terminal device refers to the terminal device that the core network needs to paging.
  • the identification information (UE-Identity) of at least one terminal device in the paging message includes the identification information of the first terminal device, it indicates that the core network is paging the first terminal device, and the identification information of the terminal device is the same as that of the core network.
  • Identification information associated with network paging When the identification information of at least one terminal device in the paging message does not include the identification information of the first terminal device, it indicates that the core network is not paging the first terminal device.
  • the identification information of at least one terminal device in the paging message does not include the identification information of the first terminal device. It can also be replaced/understood as: the identification information of at least one terminal device in the paging message is consistent with the first terminal device. The device identification information does not match.
  • the first condition of the above step 202 can be replaced by: at least one multicast session in the paging message contains the multicast session joined by the first terminal device, and the identification information of at least one terminal device in the paging message The identification information of the first terminal device is not included, and the first terminal device is not in the process of transmitting small data. That is, when the first terminal device is not in the process of small data transmission and is not paged by the core network, but is notified that a multicast session is activated, the first terminal device triggers the RRC connection recovery process, enters the RRC connection state, and subsequently receives The data sent by the network through this active multicast session.
  • the first terminal device determines not to trigger the RRC connection recovery process.
  • the second condition includes: at least one multicast session in the paging message includes a multicast session joined by the first terminal device, and the first terminal device is in the process of transmitting small data. That is, when the first terminal device determines that one or some multicast sessions of the first terminal device have been activated and the network needs to send data to the first terminal device through the activated multicast session, but the first terminal device is currently in During the small data transmission process, the first terminal device determines not to trigger the RRC connection recovery process. Specifically, when the first terminal device is in the RRC inactive state, it is determined not to send the RRC recovery request message.
  • the first terminal device is in the process of small data transmission and has sent an RRC recovery request message to the wireless access network device.
  • the first terminal device and the wireless access network There are already available signaling/data transmission links between devices. Which radio access network device the first terminal device maintains a connection with is known to the network side, so the first terminal device does not need to send an RRC recovery again. request messages, thereby saving signaling overhead. Since the radio access network device knows that the first terminal device is transmitting small data and needs to send the data of the multicast session to the first terminal device, the radio access network device can send the data to the first terminal device after the small data transmission of the first terminal device is completed.
  • the first terminal device sends an RRC recovery message to trigger the first terminal device to enter the RRC connection state, and then sends the multicast session data to the first terminal device in the RRC connection state, or the wireless access network device can also stop the first terminal device.
  • a terminal device transmits small data and sends an RRC recovery message to the first terminal device to trigger the first terminal device to enter the RRC connected state, and then sends multicast session data to the first terminal device in the RRC connected state.
  • the first The terminal device enters the RRC idle state and triggers the RRC connection establishment process.
  • the third condition includes: at least one multicast session in the paging message includes a multicast session joined by the first terminal device, and the identification information of at least one terminal device in the paging message includes the identification information of the first terminal device, And the first terminal device is not in the process of transmitting small data. That is, when the first terminal device is not in the process of small data transmission, but is paged by the core network and is notified that a multicast session is activated, the first terminal device enters the RRC idle state and triggers the RRC connection establishment process. Receives data sent by the network through this active multicast session.
  • the device may send indication information to the radio access network device, where the indication information indicates that at least one multicast session in the paging message includes a multicast session joined by one or some of the first terminal devices, or indicates that the first terminal device One or some joined multicast sessions in the device have been activated, or indicate the arrival of multicast services, or indicate the arrival of data and/or signaling on the wireless bearer for non-small data transmission (arrival of data and/or signaling mapped to radio bearers not configured for SDT).
  • the indication information may be carried in assistance information (UEAssistanceInformation) and sent to the radio access network device.
  • the indication information is non-SDT data indication information (nonSDT-DataIndication).
  • the radio access network device can learn that the first terminal device has data or signaling arriving on the wireless bearer for non-small data transmission, or learn that the first terminal device desires to enter the RRC connection.
  • Receiving the multicast session in the state helps the wireless access network device determine whether to restore the first terminal device to the RRC connection state, which facilitates subsequent correct communication between the wireless access network device and the first terminal device. For example, if the first terminal device does not expect to enter the RRC connected state to receive the multicast session indicated in the paging message after receiving the paging message, or the multicast session has been released, the first terminal device may not send a request to the RRC connection state. When the radio access network device sends the indication information, the radio access network device does not need to let the first terminal device enter the RRC connection state.
  • a terminal device in the RRC inactive state can determine whether to listen to a paging message for group notification based on the status of small data transmission.
  • the paging message contains identification information of at least one multicast session.
  • the terminal The device has joined one or more multicast sessions.
  • the terminal device decides to listen to the paging message for group notification or not to listen to the paging message for group notification based on the status of small data transmission, instead of always listening to the paging message for group notification, which helps to save money. Eliminate unnecessary energy consumption overhead, reduce the processing complexity of terminal equipment, and reduce signaling overhead.
  • the following describes different implementation methods for the terminal device to determine whether to listen to the paging message for group notification based on the status of small data transmission.
  • Implementation method one when the terminal device is not transmitting small data, the terminal device monitors paging messages.
  • the terminal device in the RRC inactive state when the terminal device in the RRC inactive state is not transmitting small data, it means that the wireless access network device does not know which cell the terminal device resides on, and there is no available link between the terminal device and the wireless access network device. Data/signaling path, so the terminal device needs to promptly determine whether the network side has sent a paging message to notify the activated multicast session by monitoring paging, so as to ensure that the data of the multicast session can be received in a timely manner.
  • Implementation method two when the terminal device is transmitting small data, the terminal device does not monitor the paging message.
  • the terminal device if the terminal device is currently in the process of small data transmission, it means that the wireless access network device knows which cell the terminal device resides on, and there is an available data/signaling path between the terminal device and the wireless access network device.
  • the terminal device has sent an RRC recovery request message to the network side, so if the network side needs to let the terminal device enter the RRC connection If the multicast session is received in a state, the RRC recovery message can be sent to the terminal device. Therefore, the terminal device does not need to listen to the paging message used to notify that the multicast session has been activated, and does not need to decode the data block on the PDSCH carrying the paging message, so that it can Save unnecessary energy consumption, reduce the processing complexity of terminal equipment, and reduce signaling overhead.
  • the wireless access network device can send RRC to the terminal device through this path.
  • the RRC message includes identification information of at least one multicast session
  • the RRC message is used to indicate that at least one multicast session has been activated
  • the RRC message also instructs the terminal device to remain in the RRC inactive state to receive multicast session.
  • the terminal device receives the joined multicast session in the RRC inactive state.
  • the paging message used for group notification is a broadcast message, which is sent on the initial bandwidth part (BWP).
  • the terminal device If the sum of the current BWP bandwidth range of the terminal device for small data transmission and the bandwidth range of the initial BWP exceeds the bandwidth supported by the terminal device (for example, the terminal device is a low-capacity terminal device), the terminal device cannot transmit and receive small data at the same time. Call message. If the terminal device wants to receive group paging during small data transmission, it needs to switch the BWP to the initial BWP to receive group paging, which will cause data packet loss during small data transmission.
  • the terminal device can receive the notification that the multicast session has been activated through dedicated signaling (ie, RRC message) on the BWP of small data transmission, instead of notifying that the multicast session has been activated through the paging message, so There is no need to perform BWP switching, packet loss can be avoided, and the implementation complexity of the terminal device can be reduced.
  • dedicated signaling ie, RRC message
  • Implementation method three when the terminal device is transmitting small data and the terminal device does not support receiving multicast sessions in the RRC inactive state, the terminal device does not monitor paging messages.
  • the terminal device if the terminal device is currently in the process of small data transmission, it means that the wireless access network device knows which cell the terminal device resides on, and there is an available data/signaling path between the terminal device and the wireless access network device.
  • the terminal device has already sent an RRC recovery request message to the network side. Therefore, if the network side needs to let the terminal device enter the RRC connection state to receive the multicast session, it can send an RRC recovery message to the terminal device. And because the terminal device does not support receiving multicast sessions in the RRC inactive state, the terminal device needs to enter the RRC connected state before receiving the data of the multicast session. Therefore, the terminal device does not need to listen to the pager used to notify that the multicast session has been activated.
  • this solution can save unnecessary energy consumption, reduce the processing complexity of the terminal device, and reduce Signaling overhead.
  • Implementation method four when the terminal device is transmitting small data and the terminal device supports receiving multicast sessions in the RRC inactive state, the terminal device monitors paging messages.
  • the terminal device If the terminal device is currently in the process of small data transmission, it means that the wireless access network device knows which cell the terminal device resides in, there is an available data/signaling path between the terminal device and the wireless access network device, and the terminal device has An RRC recovery request message has been sent to the network side. Therefore, if the network side needs to allow the terminal device to enter the RRC connection state to receive the multicast session, it can send an RRC recovery message to the terminal device to trigger the terminal device to enter the RRC connection state to receive the multicast session. Therefore, in general, the terminal device does not need to listen to the paging message used to notify that the multicast session has been activated, and only needs to wait for the RRC recovery message sent by the radio access network device.
  • the terminal device needs to monitor the paging message. This is because: the terminal device supports When receiving a multicast session in the RRC inactive state, the wireless access network device may not send an RRC recovery message to the terminal device to trigger the terminal device to enter the RRC connected state and receive multicast session data in the RRC connected state. Therefore, the terminal device needs to actively Monitor paging messages to know whether the multicast session has been activated to avoid missing the multicast session data sent by the network. When the terminal device monitors the multicast session If the session has been activated, the multicast session data can be received in the RRC inactive state.
  • Implementation method five when the terminal device is transmitting small data, the terminal device supports receiving multicast sessions in the RRC inactive state, and the cell where the terminal device resides supports providing multicast sessions for the terminal device in the inactive state, then the terminal device Listen for paging messages.
  • the multicast session provided by the cell where the terminal device resides is a multicast session that the terminal device has joined in the inactive state. Since the terminal device supports receiving multicast sessions in the RRC inactive state, and the current resident cell supports sending the multicast session to the terminal device in the RRC inactive state, the radio access network device may not send RRC recovery to the terminal device. message to trigger the terminal device to enter the RRC connection state and receive the data of the multicast session in the RRC connection state. Therefore, the terminal device needs to actively monitor the paging message to know whether the multicast session has been activated to avoid missing the multicast session issued by the network. The data. When the terminal device detects that the multicast session has been activated, it can receive the data of the multicast session in the RRC inactive state.
  • FIG. 3 is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Step 301 The terminal device receives the first message.
  • the first message may be a paging message or an RRC message.
  • the specific content and implementation method of the paging message are the same as the specific content and implementation method of the paging message in step 201, and reference can be made to the foregoing description.
  • the RRC message When the first message is an RRC message, the RRC message includes identification information of at least one multicast session, the RRC message is used to indicate that at least one multicast session has been activated, and the RRC message is a unicast message or dedicated signaling.
  • Step 302 When at least one multicast session includes a multicast session joined by the terminal device, and the terminal device is in the process of transmitting small data, the terminal device enters the RRC idle state and triggers the RRC connection establishment process.
  • At least one multicast session in the first message contains a multicast session joined by the terminal device, it indicates that one or some multicast sessions joined by the terminal device have been activated, or it is understood that the network side has data needs for the multicast session. sent to the terminal device.
  • At least one multicast session in the first message sent by the network side contains a multicast session joined by the terminal device, it indicates that the network side has multicast session data that needs to be sent to the terminal device, and the terminal device can request recovery from the network side.
  • RRC connection to receive data for the multicast session.
  • the terminal device is currently in the process of small data transmission after receiving the paging message, it means that the wireless access network device knows which cell the terminal device resides on, and there is an available link between the terminal device and the wireless access network device. In the data/signaling path, the terminal device has sent an RRC recovery request message to the network side before receiving the paging message.
  • the network side needs to let the terminal device enter the RRC connection state to receive the multicast session, it can send RRC to the terminal device. Recovery message. Therefore, after receiving the paging message, if the terminal device is currently in the process of small data transmission, it does not need to send the RRC recovery request message to the network side again. Instead, it can directly enter the RRC idle state and trigger the RRC connection establishment process, so that it can It can quickly enter the RRC connection state and receive multicast session data, save unnecessary energy consumption, reduce the processing complexity of terminal equipment, and reduce signaling overhead.
  • the terminal device Since the terminal device will move in the RRC inactive state, if the wireless access network device currently connected to the terminal device (also known as the serving access network device (serving gNB), the receiving access network device (receving gNB), or the third A radio access network device) is not the last serving radio access network device (last serving gNB, also called anchor access network device) (anchor gNB) or the second radio access network device), after the terminal device triggers the small data transmission process, the first radio access network device will execute the process of retrieving the terminal device context (retrieve UE context). The first radio access network device sends a retrieval terminal device context request message to the second radio access network device, which indicates a small data transmission (SDT) request. The second radio access network device decides whether to relocate the terminal device context (UE context). relocation).
  • serving gNB serving access network device
  • receiving gNB receiving access network device
  • third A radio access network device the last serving radio access network device
  • anchor gNB also called anchor access network device
  • the last serving wireless access network device or anchor access network device refers to the wireless access network device or terminal that finally provides services to the terminal device in the RRC connected state before the terminal device enters the RRC inactive state.
  • Scenario 1 small data transmission with context relocation (SDT with UE context relocation).
  • the complete terminal device context is sent to the first radio access network device, which is called small data transmission with context relocation.
  • the uplink small data is sent from the first radio access network device to the user plane function (UPF) network element.
  • the first radio access network device may send an RRC release (RRCRelease) message to the terminal device to release the terminal device to the RRC inactive state or the RRC idle state.
  • RRC release RRCRelease
  • the first radio access network device may send an RRC recovery (RRCResume) message to the terminal device to return the terminal device to the RRC connection state.
  • Scenario 2 small data transmission without context relocation (SDT without UE context relocation).
  • the second radio access network device decides not to relocate the complete terminal device context, it sends a partial terminal device context (partial UE context) to the first radio access network device, which contains the SDT radio chain required to handle the small data transmission.
  • Radio link control (RLC) context information which is called small data transmission without context relocation.
  • the second radio access network device maintains a packet data convergence protocol (PDCP) entity, and the first radio access network device establishes an SDT-related RLC context and forwards small data/signaling to the second radio access network device.
  • the network access device is then sent to the core network by the second radio access network device.
  • PDCP packet data convergence protocol
  • Figure 3(a) is a schematic flow chart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Step 301a The first terminal device sends an RRC recovery request message to the first radio access network device.
  • the RRC recovery request message is used to trigger Small Data Transfer (SDT).
  • SDT Small Data Transfer
  • the RRC recovery request message is carried in the random access message 3 (MSG3) or the random access message A (MSGA) sent by the first terminal device.
  • RRC recovery request message may also change, such as being called an RRC message, an RRC request message, etc.
  • the first terminal device supports receiving multicast services in an RRC inactive state, and the first terminal device joins one or more multicast sessions.
  • Multicast session, multicast service, and multicast in this application may be replaced with each other in some places and have the same meaning.
  • Step 302a The first radio access network device sends a context request message to the second radio access network device.
  • the context request message is also called a RETRIEVE UE CONTEXT REQUEST message, a context retrieval request message or a retrieval request message, etc.
  • a unified explanation is given here and will not be repeated later.
  • the context request message is used to request to obtain context related to small data transmission of the first terminal device, which is also called small data transmission context.
  • Step 303a The second radio access network device sends the partial context (PARTIAL UE CONTEXT) of the first terminal device to the first radio access network device.
  • the partial context includes a context for small data transmission (SDT related context).
  • SDT related context a context for small data transmission
  • the small data transmission context of the first terminal device is part of the terminal device context of the first terminal device.
  • the terminal device context of the first terminal device is also called the full context of the first terminal device (full UE context). .
  • the partial context is carried in a partial context transmission (PARTIAL UE CONTEXT TRANSTER) message and sent to the first radio access network device.
  • PARTIAL UE CONTEXT TRANSTER partial context transmission
  • Step 304a The first radio access network device receives the first paging message.
  • the first paging message comes from the second radio access network device or the core network device.
  • the first paging message may also be called a RAN multicast group paging message.
  • the first paging message may also be called multicast group paging.
  • AMF access and mobility management function
  • the first paging message includes identifiers of one or more multicast sessions, and the first paging message is used to notify activation of one or more multicast sessions.
  • the first paging message also includes information for paging the terminal device, which may be the location where paging is sent, information for determining the location where paging is sent, or information for determining paging timing (paging). occasion), the information used to page the terminal device is determined based on the identity of the terminal device joining the at least one multicast session. For example, the information for paging the terminal device is the value of the terminal device's identifier 5G-S-TMSI modulo 1024.
  • Step 305a The first radio access network device sends a second paging message.
  • the second paging message is obtained according to the first paging message.
  • the second paging message indicates that at least one multicast session is activated. That is to say, it indicates that at least one multicast session is in the active state or is in the active state, or indicates that at least one multicast session changes from the inactive state to the active state. This is explained uniformly here and will not be described in detail later.
  • the at least one multicast session may be the same as the one or more multicast sessions in the first paging message, or a subset of the one or more multicast sessions in the first paging message.
  • the first radio access network device may receive a first paging message from the second radio access network device and another first paging message from the core network device, and then receive the first paging message from the second radio access network device respectively.
  • the second paging message is also used to instruct the terminal device in the RRC connected state to receive the at least one multicast session. That is, the terminal device in the RRC connected state can receive the at least one multicast session, and the terminal device in the RRC non-connected state cannot receive the at least one multicast session. Or it can also be understood that the at least one multicast session is a multicast session provided for the terminal device in the RRC connected state. Or it can also be understood that the at least one multicast session is a multicast session received by the terminal device in the RRC connected state.
  • the second paging message includes a first multicast session identifier list
  • the first multicast session identifier list indicates the identifier of at least one activated multicast session
  • the second paging message is also used to indicate that the at least one multicast session is in an RRC connection.
  • Multicast sessions received by terminal devices in connected state or RRC non-connected state that is, the second paging message also indicates whether each multicast session in the at least one multicast session is received by the terminal device in the RRC connected state or in the non-RRC connected state.
  • the second paging message includes a second multicast session identifier list.
  • the second multicast session identifier list includes an identifier of at least one activated multicast session and indication information corresponding to each multicast session.
  • the indication information It is used to indicate that the multicast session is a multicast session received in RRC connected state or RRC non-connected state.
  • the RRC non-connected state can be RRC inactive state and/or RRC idle state.
  • the indication information is 1-bit information
  • the second multicast session identifier list includes the identifier of multicast session 1, the identifier of multicast session 2, the indication information corresponding to multicast session 1, and the indication information corresponding to multicast session 2, and the indication information corresponding to multicast session 1 is 0, and the indication information corresponding to multicast session 2 is 1.
  • multicast session 1 is received by the terminal device in the non-RRC connected state
  • multicast session 2 is received by the terminal device in the RRC connected state.
  • whether the indication information is included can also be used to indicate whether the multicast session is a multicast session received in the RRC connected state or the RRC non-connected state. For example, when the second multicast session identifier list contains the identifier of multicast session 1 and includes the group If the indication information corresponding to multicast session 1 is displayed, it means that the multicast session 1 is a multicast session received in a non-RRC connected state; when the second multicast session identifier list contains the identifier of multicast session 1, it means that the multicast session 1 It is a multicast session received in RRC connected state.
  • the first radio access network device Since the first radio access network device does not have a complete terminal device context, after receiving the first paging message, the first radio access network device does not know which terminal device joins or wants to receive the indication in the first paging message. of active multicast sessions. Therefore, the first radio access network device may notify the terminal device of multicast session activation by sending a first paging message, and when the second paging message includes information for paging the terminal device (for example, for determining a paging opportunity information), the first wireless access network device determines the location to send the first paging message according to the second paging message; when the second paging message does not include information for paging the terminal device, the first wireless access network device The access network equipment sends the first paging message on all paging occasions of at least one default paging cycle.
  • the first radio access network device when the first radio access network device expects the terminal device to enter the RRC connection state to receive the above-mentioned activated multicast session, the first radio access network device cannot determine whether the terminal device in the SDT process joins or wants to The terminal device receives the activated multicast session, so it cannot directly send an RRC recovery message to the terminal device to instruct the terminal device to enter the RRC connected state.
  • the terminal device and/or the first radio access network device may support multicast in the RRC inactive state, or may only support multicast in the RRC connected state, which is not limited by the present invention.
  • Step 306a The first terminal device sends indication information to the first radio access network device.
  • the first terminal device monitors paging, and if a second paging message is received and the second paging message indicates that at least one multicast session joined by the first terminal device is activated, then the first terminal device sends indication information to the first radio access network device.
  • the indication information includes a data indication indicating non-small data transmission, and/or a multicast cause value.
  • the multicast cause value is also called a multicast cause value, or a multicast-related cause value.
  • the multicast cause value can also be understood as an RRC recovery cause value related to multicast.
  • non-small data transmission data indication (nonSDT-DataIndication) is used to indicate that during the small data transmission process, data and/or signaling has arrived on the radio bearer for non-small data transmission.
  • the above data and/or signaling arrival can be understood as uplink data and/or signaling arriving or about to arrive at the first terminal device, and can also be understood as downlink data and/or signaling arriving or about to arrive at the first terminal device. .
  • the multicast cause value may indicate that the at least one multicast session includes a multicast session joined by the first terminal device, or the multicast session joined by the first terminal device is activated, or the first terminal device enters an RRC connection. state to receive multicast.
  • the multicast cause value can also be a multicast-related access type, such as MBS-access.
  • the indication information may be in user assistance information (UE assistant information, UAI), or The latter is the information carried in UAI.
  • UE assistant information UAI
  • UAI user assistance information
  • the first terminal device is in the SDT process.
  • Step 307a The first radio access network device sends a context request message to the second radio access network device according to the instruction information.
  • the first radio access network device When the first radio access network device receives the indication information, it determines that the multicast session of the first terminal device is activated, that is, the first terminal device expects to enter the RRC connection state to receive the activated multicast session. Therefore, the first radio access network device The network device sends a context request message to the second radio access network device to request the complete context of the first terminal device.
  • Step 308a The second radio access network device sends the terminal device context of the first terminal device to the first radio access network device.
  • the terminal device context is the complete context of the terminal device (full UE context).
  • the terminal device context is carried in a context response message and sent to the first radio access network device.
  • the context response message is also called a RETRIEVE UE CONTEXT RESPONSE message, a context retrieval response message or a retrieval response message, etc.
  • a unified explanation is given here and will not be repeated later.
  • Step 309a The first radio access network device sends an RRC recovery message to the first terminal device.
  • the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • the first terminal device when the first terminal device performs small data transmission, if the first terminal device receives the second paging message indicating that one or some of the multicast sessions it has joined are activated, and the first terminal device is instructed to receive the group in the RRC connected state broadcast session, the first terminal device sends indication information to the first radio access network device, so that the first radio access network device determines that the first terminal device is a terminal device that expects to enter the RRC connection state to receive the activated multicast session, Therefore, after retrieving the complete context of the terminal device from the last serving access network device (the second radio access network device), the first terminal device is instructed to restore the RRC connection state, which can avoid unnecessary signaling overhead and contribute to The first terminal device enters the RRC connection state faster and starts receiving the multicast session.
  • Figure 3(b) is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Step 301b The first terminal device sends an RRC recovery request message to the first radio access network device.
  • the RRC recovery request message is used to trigger SDT.
  • the RRC recovery request message is carried in the random access message 3 (MSG3) or the random access message A (MSGA) sent by the first terminal device.
  • RRC recovery request message may also change, such as being called an RRC message, an RRC request message, etc.
  • the first terminal device supports receiving multicast services in an RRC inactive state, and the first terminal device joins one or more multicast sessions.
  • Step 302b The first radio access network device sends a context request message to the second radio access network device.
  • the context request message is used to request to obtain the context of the first terminal device for small data transmission.
  • One possible implementation manner is that the context request message includes a small data transmission indication field.
  • Step 303b The second radio access network device sends part of the context of the first terminal device to the first radio access network device, including the small data transmission context and the multicast-related context.
  • the small data transmission context and the multicast-related context of the first terminal device are part of the terminal device context of the first terminal device, and the terminal device context is also called the complete context of the first terminal device.
  • the multicast-related context may include the identifier of the multicast session that the first terminal device joins, or may include the identifier of the multicast session that the first terminal device joins, and optionally also includes the point-to-multipoint number of the multicast session. (point to multipoint, PTM) configuration.
  • PTM point to multipoint
  • Step 304b The first radio access network device receives the first paging message.
  • the first paging message comes from the second radio access network device or the core network device.
  • the first paging message includes identifiers of one or more multicast sessions, and the first paging message is used to notify activation of one or more multicast sessions.
  • the one or more multicast sessions are also the activated multicast sessions, or a subset of the activated multicast sessions.
  • Step 305b The first radio access network device sends a second paging message to the first terminal device.
  • the first radio access network device Since the first radio access network device has obtained the multicast-related context of the first terminal device, it knows the multicast session joined by the first terminal device. If the identifiers of one or more multicast sessions in the first paging message include the identifiers of the multicast sessions that the first terminal device joins, a second paging message is sent to the first terminal device, and the second paging message The message indicates that at least one multicast session is activated, and the at least one multicast session includes a multicast session joined by the first terminal device.
  • the second paging message is determined based on the first paging message, or it can be understood that the second paging message is triggered by the first paging message.
  • the second paging message may be the same as the first paging message, or may be different.
  • Step 306b The first radio access network device sends a context request message to the second radio access network device.
  • the first radio access network device determines that the activated at least one multicast session includes the multicast session joined by the first terminal device, and then the first radio access network device sends a context request message to the second radio access network device to The complete context of the first terminal device is requested.
  • Step 307b The second radio access network device sends the terminal device context of the first terminal device to the first radio access network device.
  • the terminal device context is the complete context of the first terminal device.
  • the terminal device context is carried in a context response message and sent to the first radio access network device.
  • Step 308b The first radio access network device sends an RRC recovery message to the first terminal device.
  • the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • part of the context sent by the second radio access network device to the first radio access network device also includes multicast-related context.
  • the broadcast-related context can determine that one or some multicast sessions joined by the first terminal device are activated, so that when the first radio access network device expects the first terminal device to enter the RRC connected state to receive the activated multicast session , so that after retrieving the complete terminal device context from the last serving access network device (the second radio access network device), the first terminal device is instructed to restore the RRC connection state, which can avoid unnecessary signaling overhead and help The first terminal device enters the RRC connected state more quickly and starts receiving the multicast session.
  • Figure 3(c) is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Steps 301c to 306c are the same as steps 301a to 306a in the embodiment of Figure 3(a).
  • Step 307c The first radio access network device sends a context confirmation message to the second radio access network device according to the instruction information.
  • the first radio access network device When the first radio access network device receives the indication information, it determines that the multicast session of the first terminal device is activated, that is, the identifier of at least one multicast session in the second paging message includes that the first terminal device has joined Therefore, the first radio access network device sends a context confirmation message to the second radio access network device to request the end of the small data transmission of the first terminal device.
  • This context confirmation message is also called RETRIEVE UE CONTEXT CONFIRM. message, context retrieval confirmation message, retrieval confirmation message, or other name.
  • Step 308c The second radio access network device sends a context failure message to the first radio access network device.
  • the context failure message is also called a RETRIEVE UE CONTEXTFAILURE message, a context retrieval failure message, a retrieval failure message, or other names.
  • the above context failure message is used to end the small data transmission of the first terminal device.
  • the context failure message includes an encapsulated RRC release message, which is used to instruct the first terminal device to release the RRC inactive state or the RRC idle state.
  • Step 309c The first radio access network device sends an RRC release message to the first terminal device.
  • the first terminal device releases to the RRC inactive state or the RRC idle state according to the RRC release message.
  • Step 310c The first terminal device sends an RRC recovery request message or an RRC establishment request message to the first radio access network device.
  • the RRC recovery request message is used to indicate entering (or recovering) to the RRC connected state.
  • the RRC establishment request message is used to request the establishment of an RRC connection.
  • Step 311c The first radio access network device sends an RRC recovery message to the first terminal device.
  • the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • the first terminal device receives the RRC recovery message and enters the RRC connection state.
  • the first radio access network device Before the first radio access network device sends the RRC recovery message to the first terminal device, the first radio access network device obtains the context of the first terminal device from the second radio access network device.
  • the existing non-SDT data arrival process can be reused on the radio access network device side. SDT is ended first and then the terminal device is allowed to enter the RRC connection state, which is more compatible with the existing process.
  • Figure 3(d) is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Steps 301d to 305d are the same as steps 301b to 305b in the embodiment of Figure 3(b).
  • Steps 306d to 310d are the same as steps 307c to 311c in the embodiment of Figure 3(c).
  • the existing non-SDT data arrival process can be reused on the radio access network device side. SDT is ended first and then the terminal device is allowed to enter the RRC connection state, which is more compatible with the existing process.
  • Figure 3(e) is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Steps 301e to 303e are the same as steps 301a to 303a in the embodiment of Figure 3(a).
  • Step 304e The second radio access network device sends the terminal device context of the first terminal device to the first radio access network device.
  • the second radio access network device determines that at least one multicast session is activated, and determines that the terminal devices joining the at least one multicast session include the first terminal device, and then sends the first terminal device to the first radio access network device.
  • the terminal device context
  • the terminal device context of the first terminal device is also called the complete context of the first terminal device.
  • the terminal device context of the first terminal device includes a multicast-related context of the first terminal device.
  • the multicast-related context may include the identifier of the multicast session that the first terminal device joins, or may include the identifier of the multicast session that the first terminal device joins, and optionally also includes the PTM configuration of the multicast session.
  • Step 305e The first radio access network device receives the first paging message.
  • the first paging message comes from the second radio access network device or the core network device.
  • the first paging message includes identifiers of one or more multicast sessions, and the first paging message is used to notify activation of one or more multicast sessions.
  • the one or more multicast sessions are also the activated multicast sessions, or a subset of the activated multicast sessions.
  • Step 306e The first radio access network device sends a second paging message to the first terminal device.
  • This step is optional.
  • the first radio access network device Since the first radio access network device has obtained the terminal device context of the first terminal device, it determines the one or more terminals that the first terminal device has joined based on the above-mentioned first paging message and the terminal device context of the first terminal device. Some multicast sessions are activated, and then a second paging message is sent to the first terminal device. The second paging message instructs the first terminal device to enter the RRC connected state to receive the multicast service.
  • the second paging message may be the same as the first paging message, or may be different.
  • Step 307e The first radio access network device sends an RRC recovery message to the first terminal device.
  • the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • step 307e can also be replaced by step 308d to step 310d in the embodiment of Figure 3(d).
  • the above solution can avoid unnecessary inclusion of multicast-related context in the partial context transmission triggered by SDT, because the multicast session received by the terminal device may not be activated during the SDT process, which can reduce the cost of wireless access network equipment. signaling overhead on the interface.
  • the second radio access network device is a network device that saves the complete context of the terminal device, it can be judged that there is a multicast session that the first terminal device has joined or wants to receive. Under the condition that at least one multicast session is activated, the terminal device context of the first terminal device is sent to the first radio access network device, thereby reducing signaling overhead and storage overhead of the first radio access network device.
  • Figure 3(f) is a schematic flowchart of a wireless communication method provided by an embodiment of the present application. The method includes the following steps:
  • Step 301f The first terminal device sends an RRC recovery request message to the first radio access network device.
  • the RRC recovery request message is used to trigger SDT.
  • the RRC recovery request message is carried in the random access message 3 (MSG3) or the random access message A (MSGA) sent by the first terminal device.
  • RRC recovery request message may also change, such as being called an RRC message, an RRC request message, etc.
  • the first terminal device supports receiving multicast services in an RRC inactive state, and the first terminal device joins one or more multicast sessions.
  • Step 302f The first radio access network device sends a context request message to the second radio access network device.
  • the context request message is used to obtain the context of the first terminal device.
  • Step 303f The second radio access network device sends the terminal device context of the first terminal device to the first radio access network device.
  • the terminal device context of the first terminal device is also called the complete context of the first terminal device.
  • the terminal device context includes a multicast-related context.
  • the multicast-related context may include an identifier of a multicast session that the first terminal device joins, or may include an identifier of a multicast session that the first terminal device joins. Options also include PTM configuration for multicast sessions.
  • Step 304f The first radio access network device receives the first paging message.
  • the first paging message comes from the second radio access network device or the core network device.
  • the first paging message includes identifiers of one or more multicast sessions, and the first paging message instructs the terminal equipment joining the one or more multicast sessions to enter the RRC connected state to receive multicast.
  • the one or more multicast sessions are also the activated multicast sessions, or a subset of the activated multicast sessions.
  • Step 305f The first radio access network device sends an RRC recovery message to the first terminal device.
  • the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • the first radio access network device determines that the multicast session joined by the first terminal device is activated according to the multicast-related context of the first terminal device and the first paging message, and then sends an RRC recovery message to the first terminal device.
  • step 305f can also be replaced by step 308d to step 310d in the embodiment of Figure 3(d).
  • the first terminal device is triggered to enter the RRC connection state, thereby helping the first terminal device to correctly receive the multicast service of the multicast session.
  • the first terminal device if the first terminal device supports receiving multicast (or multicast service) in the RRC inactive state, that is, the first terminal device joins the multicast session, if the first terminal device is transmitting small data During this period, a paging message is received, and the paging message is used to instruct the first terminal device to remain in the RRC inactive state to receive multicast services, then the first terminal device remains in the RRC inactive state according to the paging message, and in Receive multicast services when RRC is inactive.
  • multicast or multicast service
  • the terminal device (or the first terminal device) includes corresponding hardware structures and/or software modules that perform each function.
  • the units and method steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driving the hardware depends on the specific application scenarios and design constraints of the technical solution.
  • Figures 4 and 5 are schematic structural diagrams of possible communication devices provided by embodiments of the present application. These communication devices can be used to implement the functions of the terminal equipment in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments.
  • the communication device may be one of the terminal devices 120a-120j shown in Figure 1, or may be a module (such as a chip) applied to the terminal device.
  • the communication device 400 shown in FIG. 4 includes a processing unit 410 and a transceiver unit 420.
  • the communication device 400 is used to implement the functions of the terminal device in the above method embodiment.
  • the transceiving unit 420 is used to receive a paging message, the paging message includes identification information of at least one multicast session, and the first terminal device is in RRC inactive state; the processing unit 410 is configured to trigger the RRC connection recovery process when a first condition is met; wherein the first condition includes: the at least one multicast session includes a multicast session joined by the first terminal device, And the first terminal device is not in the process of small data transmission; or, the first condition includes: the paging message also includes identification information of at least one terminal device, and the at least one multicast session includes the first terminal device joining multicast session, the terminal device is not in the process of small data transmission, and the identification information of the at least one terminal device does not include the identification information of the first terminal device; the small data transmission is for the first terminal device when RRC is inactive The data amount is lower than the preset threshold and/or signaling is transmitted in a state.
  • the processing unit 410 is configured to send an RRC recovery request message to the radio access network device through the transceiver unit 420.
  • the processing unit 410 is also configured to determine not to trigger the RRC connection when the second condition is met.
  • the transceiver unit 420 is also configured to send indication information to the radio access network device.
  • the indication information indicates that data and/or signaling has arrived on the wireless bearer for non-small data transmission, or that at least one
  • the multicast session includes the multicast session joined by the first terminal device, or the multicast session joined by the first terminal device has been activated.
  • the processing unit 410 is also configured to enter the RRC idle state and trigger the RRC connection establishment process when a third condition is met; wherein the third condition includes: the paging message also includes at least one terminal device
  • the identification information of the at least one multicast session includes the multicast session joined by the first terminal device, the terminal device is not in the process of small data transmission, and the identification information of the at least one terminal device includes the first terminal device. Identification information.
  • the processing unit 410 is used for the terminal device to determine whether to monitor the paging message for group notification according to the status of small data transmission.
  • the terminal device is in RRC non- In the active state, the paging message contains identification information of at least one multicast session; wherein the terminal device has joined one or more multicast sessions, and the small data transmission is data performed by the first terminal device in the RRC inactive state.
  • the amount of data and/or signaling is below a preset threshold.
  • the processing unit 410 is specifically configured to monitor the paging message when the terminal device is not transmitting small data.
  • the processing unit 410 is specifically configured to not monitor the paging message when the terminal device is transmitting small data.
  • the processing unit 410 is specifically configured to not monitor the paging message when the terminal device is transmitting small data and the terminal device does not support receiving the multicast session in the RRC inactive state.
  • the transceiver unit 420 is configured to receive an RRC message.
  • the RRC message includes identification information of the at least one multicast session.
  • the RRC message is used to indicate that the at least one multicast session has been activated; when the At least one multicast session includes the multicast session joined by the terminal device, and the terminal device receives the multicast session joined by the terminal device in the RRC inactive state.
  • the processing unit 410 is specifically configured to monitor the paging message when the terminal device is transmitting small data and the terminal device supports receiving a multicast session in the RRC inactive state.
  • the processing unit 410 is specifically used when a terminal device is transmitting small data, the terminal device supports receiving a multicast session in the RRC inactive state, and the cell where the terminal device resides supports being in the inactive state.
  • the active terminal device provides a multicast session and listens to the paging message.
  • the transceiving unit 420 is used to receive the first message, the first message includes the identification information of at least one multicast session, and the terminal device is in the RRC inactive state.
  • the processing unit 410 is configured to enter the RRC idle state and trigger the RRC connection establishment process when the at least one multicast session includes the multicast session joined by the terminal device, and the terminal device is in the process of small data transmission; wherein, the Small data transmission refers to the transmission of data and/or signaling by the terminal device in the RRC inactive state with a data amount lower than a preset threshold.
  • the first message is an RRC message or a paging message.
  • the processing unit 410 is used to control the transceiver unit 420 to send a second paging message, where the second paging message indicates at least one group Activating the broadcast session; receiving indication information from the first terminal device, the indication information including an indication indicating non-small data transmission data, and/ Or a multicast cause value; wherein the at least one multicast session includes a multicast session joined by the first terminal device, and the first terminal device is in the Radio Resource Control (RRC) inactive state and is in the process of small data transmission;
  • RRC Radio Resource Control
  • the first radio access network device is a serving radio access network device of the first terminal device.
  • the processing unit 410 is also configured to control the transceiver unit 420 to send an RRC recovery message to the first terminal device after receiving the instruction information from the first terminal device.
  • the RRC recovery message is used to restore the RRC connection of the first terminal device.
  • the processing unit 410 is also configured to control the transceiver unit 420 to send an RRC release message to the first terminal device before sending the RRC recovery message to the first terminal device.
  • the RRC release message is To instruct the first terminal device to enter the RRC inactive state or the RRC idle state; the first radio access network device receives an RRC recovery request message from the first terminal device, and the RRC recovery request message is used to request Enter the RRC connection state; or, receive an RRC establishment request message from the first terminal device, where the RRC establishment request message is used to request the establishment of an RRC connection.
  • the second paging message is also used to instruct the terminal device in the RRC connected state to receive the at least one multicast session; or, the second paging message is also used to instruct the At least one multicast session is a multicast session received by the terminal device in RRC connected state or RRC non-connected state.
  • the processing unit 410 is also configured to control the transceiver unit 420 to receive a first paging message before sending the second paging message, where the first paging message is used to notify one or more multicast Session activation; and determining the second paging message according to the first paging message.
  • the processing unit 410 is configured to control the transceiver unit 420 to receive the first paging message, specifically including: receiving the first paging message from the second radio access network device or the core network device. message, the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the first paging message also includes information for paging the terminal device; the processing unit 410 is also used to control the transceiver unit 420 to send the second paging message, specifically including: The second paging message is sent according to the information for paging the terminal device.
  • the multicast cause value indicates that the at least one multicast session includes a multicast session joined by the first terminal device, or indicates that the multicast session joined by the first terminal device is activated. , or instruct the first terminal device to enter the RRC connected state to receive multicast.
  • the processing unit 410 is also configured to control the transceiver unit 420 to send a context request message to the second radio access network device after receiving the instruction information from the first terminal device, where the context request message is used to Request the terminal device context of the first terminal device, and the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connection state; receive the message from the second radio access network device.
  • the terminal device context of the first terminal device of the network device is also configured to control the transceiver unit 420 to send a context request message to the second radio access network device after receiving the instruction information from the first terminal device, where the context request message is used to Request the terminal device context of the first terminal device, and the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connection state; receive the message from the second radio access network device.
  • the terminal device context of the first terminal device of the network device is also configured to control the transceiver unit 420 to send a context request message to the second radio access network device after receiving
  • the transceiver unit 420 is used to receive a first paging message, where the first paging message includes one or more multicast The identifier of the session, the first paging message is used to notify the activation of the one or more multicast sessions, and the first radio access network device is a first terminal device serving the radio access network device; wherein, the The first terminal device is in the Radio Resource Control (RRC) inactive state and is in the process of small data transmission; the processing unit 410 is configured to obtain the multicast-related context of the first terminal device, where the multicast-related context includes the The identifier of the multicast session joined by the first terminal device; the transceiver unit 420 is also configured to send an RRC recovery message to the first terminal device, and the identifier of the one or more multicast sessions includes the first terminal device The identifier of the joined multicast session. The RRC recovery message is used to recover the first terminal device. RRC connection.
  • RRC Radio Resource Control
  • the processing unit 410 is also configured to determine a second paging message according to the first paging message before the transceiver unit 420 sends the RRC recovery message to the first terminal device, and the The second paging message indicates the activation of at least one multicast session, and the at least one multicast session includes the multicast session joined by the first terminal device; the transceiving unit 420 is also configured to send the second paging message.
  • the transceiver unit 420 is further configured to send an RRC release message to the first terminal device before sending the RRC recovery message to the first terminal device, where the RRC release message is used to indicate that the The first terminal device enters the RRC inactive state or the RRC idle state; receives an RRC recovery request message from the first terminal device, the RRC recovery request message is used to request to enter the RRC connected state; or, receives an RRC recovery request message from the first terminal device.
  • the transceiver unit 420 is configured to receive a first paging message, specifically including: receiving the first paging message from a second radio access network device or a core network device, the The second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the processing unit 410 is configured to obtain the multicast-related context of the first terminal device, specifically including: sending a first context request to the second radio access network device through the transceiver unit 420. message, the first context request message is used to request to obtain the context of the first terminal device for small data transmission; receive part of the context of the first terminal device from the second radio access network device, the Part of the context of the first terminal device includes context related to small data transmission and context related to the multicast.
  • the second radio access network device is the last serving radio access network of the first terminal device in the RRC connected state. equipment.
  • the transceiver unit 420 is further configured to send a second context request message to the second radio access network device, where the second context request message is used to request to obtain the information of the first terminal device.
  • Context receiving a terminal device context of the first terminal device from the second radio access network device.
  • the processing unit 410 is configured to obtain the multicast-related context of the first terminal device, specifically including: receiving the first terminal from the second radio access network device through the transceiver unit 420.
  • the terminal device context of the device, the terminal device context includes the multicast-related context, and the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connected state.
  • the processing unit 410 is used to determine whether the identifier of one or more activated multicast sessions includes the group joined by the first terminal device.
  • the identifier of the multicast session; the transceiver unit 420 is configured to send the identifier of the multicast session to the first wireless access network device when the identifier of the activated one or more multicast sessions includes the identifier of the multicast session joined by the first terminal device.
  • the terminal device context of the first terminal device wherein the first terminal device is in the Radio Resource Control (RRC) inactive state and is in a small data transmission process; the first radio access network device is the first terminal device A serving radio access network device, and the second radio access network device is the last serving radio access network device of the first terminal device in the RRC connection state.
  • RRC Radio Resource Control
  • the terminal device context includes a multicast-related context of the first terminal device.
  • the transceiver unit 420 is further configured to receive the context from the first radio access network device before sending the terminal device context of the first terminal device to the first radio access network device.
  • Request message the context request message is used to request to obtain the context of the terminal device for small data transmission; send part of the context of the first terminal device to the first radio access network device, the first terminal device Part of the context includes context related to small data transmission.
  • the method further includes: the second radio access network device sending a first paging message to the first radio access network device, the first paging message being used to notify The one or more multicast sessions are activated.
  • the first paging message includes identifiers of the one or more multicast sessions.
  • the processing unit 410 is used to control the transceiver unit 420 to receive the second paging message from the first radio access network device.
  • the paging message indicates that at least one multicast session is activated; sending indication information to the first radio access network device, the indication information including a data indication indicating non-small data transmission, and/or a multicast cause value; wherein the at least one group
  • the broadcast session includes a multicast session joined by the first terminal device, the first terminal device is in the radio resource control RRC inactive state and is in the process of small data transmission; the first radio access network device is the third A terminal device is a service wireless access network device.
  • the processing unit 410 is further configured to control the transceiver unit 420 to receive an RRC recovery message from the first radio access network device after sending the instruction information to the first radio access network device, the The RRC recovery message is used to restore the RRC connection of the first terminal device.
  • the processing unit 410 is also configured to control the transceiver unit 420 to receive an RRC release from the first radio access network device before receiving the RRC recovery message from the first radio access network device.
  • the RRC release message is used to instruct the first terminal device to enter the RRC inactive state or the RRC idle state; send an RRC recovery request message to the first radio access network device, the RRC recovery request message is used to Request to enter the RRC connection state; or, send an RRC establishment request message to the first radio access network device, where the RRC establishment request message is used to request to establish an RRC connection.
  • the second paging message is also used to instruct the terminal device in the RRC connected state to receive the at least one multicast session; or, the second paging message is also used to instruct the At least one multicast session is a multicast session received by the terminal device in RRC connected state or RRC non-connected state.
  • the multicast cause value indicates that the at least one multicast session includes a multicast session joined by the first terminal device, or indicates that the multicast session joined by the first terminal device is activated. , or instruct the first terminal device to enter the RRC connected state to receive multicast.
  • the communication device 500 includes a processor 510 and an interface circuit 520 .
  • the processor 510 and the interface circuit 520 are coupled to each other.
  • the interface circuit 520 may be a transceiver or an input-output interface.
  • the communication device 500 may also include a memory 530 for storing instructions executed by the processor 510 or input data required for the processor 510 to run the instructions or data generated after the processor 510 executes the instructions.
  • the processor 510 is used to realize the function of the above processing unit 410
  • the interface circuit 520 is used to realize the function of the above transceiver unit 420.
  • the terminal device chip implements the functions of the terminal device in the above method embodiment.
  • the terminal equipment chip receives information from other modules in the terminal equipment (such as radio frequency modules or antennas), and the information is sent by the wireless access network equipment to the terminal equipment; or, the terminal equipment chip sends information to other modules in the terminal equipment (such as Radio frequency module or antenna) sends information, which is sent by the terminal device to the wireless access network device.
  • the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), or an application-specific integrated circuit. (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor can be a microprocessor or any conventional processor.
  • the method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory In memory, register, hard disk, mobile hard disk, compact disc read-only memory (CD-ROM) or any other form of storage medium well known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage media may be located in an ASIC.
  • the ASIC may be located in the radio access network device or the terminal device.
  • the processor and the storage medium may also exist as discrete components in the radio access network device or the terminal device.
  • the computer program product includes one or more computer programs or instructions.
  • a computer program (English: Computer Program) refers to a set of instructions that instruct each step of an electronic computer or other device with message processing capabilities. It is usually written in a certain programming language and runs on a certain target architecture. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, a wireless access network device, a terminal device, or other programmable devices.
  • the computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another.
  • the computer program or instructions may be transmitted from a website, computer, A server or data center transmits via wired or wireless means to another website site, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media.
  • the available media may be magnetic media, such as floppy disks, hard disks, and tapes; optical media, such as digital video optical disks; or semiconductor media, such as solid-state hard drives.
  • the computer-readable storage medium may be volatile or nonvolatile storage media, or may include both volatile and nonvolatile types of storage media.
  • “at least one” refers to one or more, and “plurality” refers to two or more.
  • “And/or” describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the related objects before and after are an “or” relationship; in the formula of this application, the character “/” indicates that the related objects before and after are a kind of "division” Relationship.

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Abstract

本申请提供一种无线通信方法、通信装置及通信系统。该方法中，第一终端设备在收到该寻呼消息之后，如果当前处于小数据传输过程，则无需再次向网络侧发送RRC恢复请求消息，而是可以等待网络侧设备发送RRC恢复消息，从而可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。

Description

一种无线通信方法、通信装置及通信系统
相关申请的交叉引用
本申请要求在2022年08月09日提交中国专利局、申请号为202210952890.0、申请名称为“一种无线通信方法、通信装置及通信系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种无线通信方法、通信装置及通信系统。
背景技术
目前，终端设备有三种无线资源控制(radio resource control，RRC)状态，分别是RRC连接态(RRC_connected)，RRC空闲态(RRC_idle)和RRC非激活态(RRC_inactive)。
对于处于RRC非激活态的终端设备，为了避免在业务流量较小的情况下进入RRC连接态带来的终端设备的能耗增加，当处于RRC非激活态的终端设备要传输的数据量低于预设阈值时，终端设备可以不进入RRC连接态，而是在RRC非激活态下与无线接入网设备进行数据和/或信令的传输。该过程称为小数据传输。
组播通信是指相同的服务和相同的数据同时提供给一组特定的终端设备。一般地，网络侧可以通过组播会话向处于RRC连接态的终端设备发送组播业务。当网络侧没有要发送给终端设备的组播会话数据时，网络侧可以让终端设备进入RRC空闲态或RRC非激活态以节约终端设备的能耗。当组播会话被激活或者组播会话的数据到达时，网络侧通过组通知机制通知处于RRC空闲态或RRC非激活态的终端设备，终端设备接收到组通知后可以重新与网络侧建立连接，以接收组播会话的数据。一旦终端设备离开该组播会话，终端设备可以停止监控与该组播会话相关的组通知。
一种场景中，当组播会话激活后，网络侧寻呼加入该组播会话且处于RRC非激活态的终端设备，此时该终端设备有可能处于小数据传输过程，也有可能没有处于小数据传输过程。此时，终端设备具体需要执行何种操作，有待解决。
发明内容
本申请实施例提供一种无线通信方法、通信装置及通信系统，用以保障终端设备在小数据传输过程中节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
第一方面，本申请实施例提供一种无线通信方法，该方法可以由第一终端设备或应用于第一终端设备的模块(如芯片)来执行。该方法包括：第一终端设备接收寻呼消息，该寻呼消息包括至少一个组播会话的标识信息，该第一终端设备处于RRC非激活态；当满足第一条件，该第一终端设备触发RRC连接恢复流程；其中，该第一条件包括：该至少一个组播会话中包含该第一终端设备加入的组播会话，且该第一终端设备不处于小数据传输过程中；或者，该第一条件包括：该寻呼消息还包括至少一个终端设备的标识信息，该 至少一个组播会话中包含该第一终端设备加入的组播会话，该终端设备不处于小数据传输过程中，且该至少一个终端设备的标识信息不包括该第一终端设备的标识信息；该小数据传输为该第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
上述方案，如果网络侧发送的寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，表明网络侧有组播会话的数据需要发送给第一终端设备，第一终端设备可以向网络侧请求恢复RRC连接以接收组播会话的数据。然而，若第一终端设备收到寻呼消息后，当前处于小数据传输过程，则表明第一终端设备在收到寻呼消息之前已经向网络侧发送过RRC恢复请求消息，无线接入网设备和第一终端设备之间有可用的数据/信令传输通路，无线接入网设备已知第一终端设备驻留的小区，因此如果网络侧需要让第一终端设备进入RRC连接态接收组播会话，则可以通过该传输通路向第一终端设备发送RRC恢复消息。因此，第一终端设备在收到该寻呼消息之后，如果当前处于小数据传输过程，则无需再次向网络侧发送RRC恢复请求消息，而是可以等待网络侧设备发送RRC恢复消息，该RRC恢复消息可以是响应于第一终端设备在触发小数据传输时发送的RRC恢复请求消息，从而可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种可能的实现方法中，该第一终端设备触发RRC连接恢复流程，包括：该第一终端设备向无线接入网设备发送RRC恢复请求消息。
一种可能的实现方法中，当满足第二条件，该第一终端设备确定不触发RRC连接恢复流程；其中，该第二条件包括：该至少一个组播会话中包含该第一终端设备加入的组播会话，且该第一终端设备处于小数据传输过程中。
上述方案，当第一终端设备正在进行小数据传输，表明第一终端设备已经向无线接入网设备发送过RRC恢复请求消息，无线接入网设备和第一终端设备之间有可用的数据/信令传输通路，无线接入网设备已知第一终端设备驻留的小区，因此第一终端设备在收到用于通知组播会话激活的寻呼消息后，可以不需要再触发RRC连接恢复流程，而是等待无线接入网设备向第一终端设备发送RRC恢复消息以使第一终端设备进入RRC连接态，从而可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种可能的实现方法中，该第一终端设备向无线接入网设备发送指示信息，该指示信息指示非小数据传输的无线承载上有数据和/或信令到达，或者该至少一个组播会话中包含该第一终端设备加入的组播会话，或者该第一终端设备加入的组播会话已经激活。
上述方案，根据第一终端设备发送的指示信息，无线接入网设备可以获知第一终端设备在非小数据传输的无线承载上有数据或信令到达，或者获知第一终端设备期望进入RRC连接态接收组播会话，有助于无线接入网设备判断是否要让第一终端设备恢复RRC连接态，便于后续无线接入网设备与第一终端设备之间的正确通信。比如，如果第一终端设备在收到寻呼消息后，不期望进入RRC连接态接收该寻呼消息中指示的组播会话，或已经释放了该组播会话，则第一终端设备可以不向无线接入网设备发送该指示信息，无线接入网设备就不需要让第一终端设备进入RRC连接态。
一种可能的实现方法中，当满足第三条件，该第一终端设备进入RRC空闲态并触发RRC连接建立流程；其中，该第三条件包括：该寻呼消息还包括至少一个终端设备的标识信息，该至少一个组播会话中包含该第一终端设备加入的组播会话，该终端设备不处于小数据传输过程中，且该至少一个终端设备的标识信息包括该第一终端设备的标识信息。
第二方面，本申请实施例提供一种无线通信方法，该方法可以由终端设备或应用于终端设备的模块(如芯片)来执行。该方法包括：终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，该终端设备处于RRC非激活态，该寻呼消息包含至少一个组播会话的标识信息；其中，该终端设备加入了一个或多个组播会话，该小数据传输为该第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
上述方案，终端设备根据小数据传输的状态决定监听用于组通知的寻呼消息或不监听用于组通知的寻呼消息，而不是始终监听用于组通知的寻呼消息，有助于节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种可能的实现方法中，该终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，包括：当终端设备未在进行小数据传输，则终端设备监听该寻呼消息。
上述方案，当处于RRC非激活态的终端设备未在进行小数据传输，表明无线接入网设备不知道终端设备驻留在哪个小区上，终端设备和无线接入网设备之间也没有可用的数据/信令通路，因此终端设备需要通过监听寻呼的方式，及时地判断网络侧是否发送了用于通知已经激活的组播会话的寻呼消息，以保证能够及时接收组播会话的数据。
一种可能的实现方法中，该终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，包括：当终端设备正在进行小数据传输，则该终端设备不监听该寻呼消息。
上述方案，若终端设备当前处于小数据传输过程，则表明无线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息，因此终端设备不需要监听用于通知组播会话已经激活的寻呼消息，无需解码承载寻呼消息的物理下行共享信道(physical downlink shared channel，PDSCH)上的数据块，从而可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种可能的实现方法中，该终端设备正在进行小数据传输，则不监听该寻呼消息，包括：当终端设备正在进行小数据传输，且该终端设备不支持在RRC非激活态接收组播会话，则该终端设备不监听该寻呼消息。
该方案，若终端设备当前处于小数据传输过程，则表明无线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息。并且由于该终端设备不支持在RRC非激活态接收组播会话，因此终端设备需要进入到RRC连接态才接收组播会话的数据，进而终端设备可以不监听用于通知组播会话已经激活的寻呼消息，无需解码承载寻呼消息的PDSCH上的数据块，而是等待网络侧主动通知终端设备进入RRC连接态，因而该方案可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种可能的实现方法中，该终端设备接收RRC消息，该RRC消息包括该至少一个组播会话的标识信息，该RRC消息用于通知该至少一个组播会话已经被激活；当该至少一个组播会话中包含该终端设备加入的组播会话，该终端设备在RRC非激活态下接收该终端设备加入的组播会话。可选的，该RRC消息还指示终端设备保持在RRC非激活态接收组播会话。
用于组通知的寻呼消息是广播消息，该寻呼消息是在初始(initial)带宽部分(bandwidth  part，BWP)上发送的。若终端设备当前进行小数据传输的BWP带宽范围与initial BWP的带宽范围的总和超出终端设备支持的带宽(例如该终端设备为低能力终端设备)，则终端设备不能同时进行小数据传输和接收寻呼消息。如果终端设备在小数据传输过程中要接收组寻呼，则需要将BWP切换到initial BWP上以接收组寻呼，这会导致小数据传输过程中的数据丢包。但通过上述方案，终端设备可以在小数据传输的BWP上通过专用信令(即RRC消息)接收用于通知组播会话已经激活的通知，而不是通过寻呼消息通知组播会话已经激活，因此无需进行BWP切换，可以避免丢包，以及降低终端设备的实现复杂度。
一种可能的实现方法中，该终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，包括：当终端设备正在进行小数据传输，且该终端设备支持在RRC非激活态接收组播会话，则该终端设备监听该寻呼消息。
若终端设备当前处于小数据传输过程，则表明无线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息，以触发终端设备进入RRC连接态接收组播会话，因此一般情况下，终端设备可以不需要监听用于通知组播会话已经激活的寻呼消息，只需要等待无线接入网设备发送的RRC恢复消息。然而，在该方案中，若终端设备正在进行小数据传输，且该终端设备支持在RRC非激活态接收组播会话，则该终端设备需要监听该寻呼消息，这是因为：由于终端设备支持在RRC非激活态接收组播会话，因而无线接入网设备可能不向终端设备发送RRC恢复消息以触发终端设备进入RRC连接态并在RRC连接态接收组播会话的数据，因此终端设备需要主动监听寻呼消息，以获知组播会话是否已经被激活，避免错过网络下发的组播会话的数据，当终端设备监听到组播会话已经被激活，则可以在RRC非激活态下接收组播会话的数据。
一种可能的实现方法中，该当终端设备正在进行小数据传输，且该终端设备支持在RRC非激活态接收组播会话，则该终端设备监听该寻呼消息，包括：当终端设备正在进行小数据传输，该终端设备支持在RRC非激活态接收组播会话，且该终端设备驻留的小区支持为处于非激活态的终端设备提供组播会话，则该终端设备监听该寻呼消息。
上述方案，需要保证该终端设备驻留的小区支持为处于非激活态的终端设备提供组播会话的情况下，终端设备在监听寻呼消息，以避免终端设备做无效的监听，有助于节约不必要的能耗开销。
第三方面，本申请实施例提供一种无线通信方法，该方法可以由终端设备或应用于终端设备的模块(如芯片)来执行。该方法包括：终端设备接收第一消息，该第一消息包括至少一个组播会话的标识信息，该终端设备处于RRC非激活态；当该至少一个组播会话中包含该终端设备加入的组播会话，且该终端设备处于小数据传输过程中，该终端设备进入RRC空闲态并触发RRC连接建立流程；其中，该小数据传输为该终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
上述方案，如果网络侧发送的第一消息中的至少一个组播会话包含终端设备加入的组播会话，表明网络侧有组播会话的数据需要发送给终端设备，终端设备可以向网络侧请求恢复RRC连接以接收组播会话的数据。然而，若终端设备收到寻呼消息后，当前处于小数据传输过程，则表明线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备在收到寻呼消息之前已经向网络侧发送 过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息。因此，终端设备在收到该寻呼消息之后，如果当前处于小数据传输过程，则无需再次向网络侧发送RRC恢复请求消息，而是可以直接进入RRC空闲态并触发RRC连接建立流程，从而可以实现快速进入RRC连接态并接收组播会话的数据，以及可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种可能的实现方法中，第一消息是RRC消息或寻呼消息。
第四方面，本申请实施例提供一种无线通信方法，该方法可以由第一无线接入网设备或应用于第一无线接入网设备的模块(如芯片)来执行。该方法包括：第一无线接入网设备发送第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活；所述第一无线接入网设备接收来自第一终端设备的指示信息，所述指示信息包括指示非小数据传输数据指示，和/或组播原因值；其中，所述至少一个组播会话中包括所述第一终端设备加入的组播会话，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备。
上述方案，根据第一终端设备发送的指示信息，第一无线接入网设备可以获知第一终端设备在非小数据传输的无线承载上有数据到达或获知第一终端设备期望进入RRC连接态接收组播会话，有助于第一无线接入网设备判断是否让第一终端设备恢复RRC连接态，便于后续第一无线接入网设备与第一终端设备之间的正确通信，比如第一终端设备在RRC连接态下接收组播会话。
一种可能的实现方法中，所述第一无线接入网设备接收来自第一终端设备的指示信息之后，还包括：所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
一种可能的实现方法中，所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息之前，还包括：所述第一无线接入网设备向所述第一终端设备发送RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；所述第一无线接入网设备接收来自所述第一终端设备的RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，所述第一无线接入网设备接收来自所述第一终端设备的RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
一种可能的实现方法中，所述第二寻呼消息还用于指示处于RRC连接态的终端设备接收所述至少一个组播会话；或者，所述第二寻呼消息还用于指示所述至少一个组播会话为处于RRC连接态或RRC非连接态终端设备接收的组播会话。
一种可能的实现方法中，所述第一无线接入网设备发送第二寻呼消息之前，还包括：所述第一无线接入网设备接收第一寻呼消息，所述第一寻呼消息用于通知一个或多个组播会话激活；根据所述第一寻呼消息，确定所述第二寻呼消息。
一种可能的实现方法中，所述第一无线接入网设备接收第一寻呼消息，包括：所述第一无线接入网设备接收来自第二无线接入网设备或核心网设备的所述第一寻呼消息，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，所述第一寻呼消息中还包括用于寻呼终端设备的信息；所述第一无线接入网设备发送第二寻呼消息，包括：所述第一无线接入网设备根据所述用于寻呼终端设备的信息，发送所述第二寻呼消息。
一种可能的实现方法中，所述组播原因值指示所述至少一个组播会话中包含所述第一终端设备加入的组播会话，或者指示所述第一终端设备加入的组播会话激活，或者指示所述第一终端设备进入RRC连接态接收组播。
一种可能的实现方法中，所述第一无线接入网设备接收来自第一终端设备的指示信息之后，还包括：所述第一无线接入网设备向第二无线接入网设备发送上下文请求消息，所述上下文请求消息用于请求所述第一终端设备的终端设备上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备；所述第一无线接入网设备接收来自所述第二无线接入网设备的所述第一终端设备的终端设备上下文。
第五方面，本申请实施例提供一种无线通信方法，该方法可以由第一无线接入网设备或应用于第一无线接入网设备的模块(如芯片)来执行。该方法包括：第一无线接入网设备接收第一寻呼消息，所述第一寻呼消息中包括一个或多个组播会话的标识，所述第一寻呼消息用于通知所述一个或多个组播会话激活，所述第一无线接入网设备是第一终端设备服务无线接入网设备；其中，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备获取所述第一终端设备的组播相关的上下文，所述组播相关的上下文中包括所述第一终端设备加入的组播会话的标识；所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息，所述一个或多个组播会话的标识中包括所述第一终端设备加入的组播会话的标识，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
上述方案，第一无线接入网设备获知激活的组播会话中包括第一终端设备加入的组播会话，则通过RRC恢复消息恢复第一终端设备的RRC连接，也即终端设备恢复到RRC连接态，便于后续第一无线接入网设备与第一终端设备之间的正确通信，比如第一终端设备在RRC连接态下接收组播会话。
一种可能的实现方法中，所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息之前，还包括：根据所述第一寻呼消息，确定第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活，所述至少一个组播会话包括所述第一终端设备加入的组播会话；发送所述第二寻呼消息。
一种可能的实现方法中，所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息之前，还包括：所述第一无线接入网设备向所述第一终端设备发送RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；所述第一无线接入网设备接收来自所述第一终端设备的RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，所述第一无线接入网设备接收来自所述第一终端设备的RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
一种可能的实现方法中，所述第一无线接入网设备接收第一寻呼消息，包括：所述第一无线接入网设备接收来自第二无线接入网设备或核心网设备的所述第一寻呼消息，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，所述第一无线接入网设备获取所述第一终端设备的组播相关的上下文，包括：所述第一无线接入网设备向第二无线接入网设备发送第一上下文请求消息，所述第一上下文请求消息用于请求获取所述第一终端设备的上下文进行小数据传输；所述第一无线接入网设备接收来自所述第二无线接入网设备的所述第一终端设备的部分上下文，所述第一终端设备的部分上下文包括小数据传输相关的上下文和所述组播相关的 上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，所述方法还包括：所述第一无线接入网设备向所述第二无线接入网设备发送第二上下文请求消息，所述第二上下文请求消息用于请求获取所述第一终端设备的上下文；所述第一无线接入网设备接收来自所述第二无线接入网设备的所述第一终端设备的终端设备上下文。
一种可能的实现方法中，所述第一无线接入网设备获取第一终端设备的组播相关的上下文，包括：所述第一无线接入网设备接收来自第二无线接入网设备的所述第一终端设备的终端设备上下文，所述终端设备上下文中包括所述组播相关的上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
第六方面，本申请实施例提供一种无线通信方法，该方法可以由第二无线接入网设备或应用于第二无线接入网设备的模块(如芯片)来执行。该方法包括：第二无线接入网设备判断激活的一个或多个组播会话的标识中是否包括第一终端设备加入的组播会话的标识；当激活的所述一个或多个组播会话的标识中包括所述第一终端设备加入的组播会话的标识，所述第二无线接入网设备向第一无线接入网设备发送所述第一终端设备的终端设备上下文；其中，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
上述方案，第二无线接入网设备获知激活的组播会话中包括第一终端设备加入的组播会话，则向第一无线接入网设备发送第一终端设备的上下文，便于第一无线接入网设备获知该第一终端设备加入的组播会话已经激活，进而第一无线接入网设备可以将终端设备恢复到RRC连接态，便于后续第一无线接入网设备与第一终端设备之间的正确通信，比如第一终端设备在RRC连接态下接收组播会话。
一种可能的实现方法中，所述终端设备上下文中包括所述第一终端设备的组播相关的上下文。
一种可能的实现方法中，所述第二无线接入网设备向第一无线接入网设备发送所述第一终端设备的终端设备上下文之前，还包括：所述第二无线接入网设备接收来自所述第一无线接入网设备的上下文请求消息，所述上下文请求消息用于请求获取所述终端设备的上下文进行小数据传输；所述第二无线接入网设备向所述第一无线接入网设备发送所述第一终端设备的部分上下文，所述第一终端设备的部分上下文包括小数据传输相关的上下文。
一种可能的实现方法中，所述方法还包括：所述第二无线接入网设备向所述第一无线接入网设备发送第一寻呼消息，所述第一寻呼消息用于通知所述一个或多个组播会话激活。
一种可能的实现方法中，所述第一寻呼消息包括所述一个或多个组播会话的标识。
第七方面，本申请实施例提供一种无线通信方法，该方法可以由第一终端设备或应用于第一终端设备的模块(如芯片)来执行。该方法包括：第一终端设备接收来自第一无线接入网设备的第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活；所述第一终端设备向第一无线接入网设备发送指示信息，所述指示信息包括非小数据传输数据指示，和/或组播原因值；其中，所述至少一个组播会话中包括所述第一终端设备加入的组播会话，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备。
上述方案，第一终端设备向第一无线接入网设备发送指示信息，使得第一无线接入网设备根据该指示信息获知第一终端设备在非小数据传输的无线承载上有数据到达或获知第一终端设备期望进入RRC连接态接收组播会话，有助于第一无线接入网设备判断是否让第一终端设备恢复RRC连接态，便于后续第一无线接入网设备与第一终端设备之间的正确通信，比如第一终端设备在RRC连接态下接收组播会话。
一种可能的实现方法中，所述第一终端设备向第一无线接入网设备发送指示信息之后，还包括：所述第一终端设备接收来自所述第一无线接入网设备的RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
一种可能的实现方法中，所述第一终端设备接收来自所述第一无线接入网设备的RRC恢复消息之前，还包括：所述第一终端设备接收来自所述第一无线接入网设备的RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；所述第一终端设备向所述第一无线接入网设备发送RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，所述第一终端设备向所述第一无线接入网设备发送RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
一种可能的实现方法中，所述第二寻呼消息还用于指示处于RRC连接态的终端设备接收所述至少一个组播会话；或者，所述第二寻呼消息还用于指示所述至少一个组播会话为处于RRC连接态或RRC非连接态终端设备接收的组播会话。
一种可能的实现方法中，所述组播原因值指示所述至少一个组播会话中包含所述第一终端设备加入的组播会话，或者指示所述第一终端设备加入的组播会话激活，或者指示所述第一终端设备进入RRC连接态接收组播。
第八方面，本申请实施例提供一种通信装置，该装置可以是终端设备或应用于终端设备中的模块(如芯片)。该装置具有实现上述第一方面至第七方面的任意实现方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第九方面，本申请实施例提供一种通信装置，包括与存储器耦合的处理器，该处理器用于调用所述存储器中存储的程序，以执行上述第一方面至第七方面中的任意实现方法。该存储器可以位于该装置之内，也可以位于该装置之外。且该处理器可以是一个或多个。
第十方面，本申请实施例提供一种通信装置，包括处理器和存储器；该存储器用于存储计算机指令，当该装置运行时，该处理器执行该存储器存储的计算机指令，以使该装置执行上述第一方面至第七方面中的任意实现方法。
第十一方面，本申请实施例提供一种通信装置，包括用于执行上述第一方面至第七方面中的任意实现方法的各个步骤的单元或手段(means)。
第十二方面，本申请实施例提供一种通信装置，包括处理器和接口电路，所述处理器用于通过接口电路与其它装置通信，并执行上述第一方面至第七方面中的任意实现方法。该处理器包括一个或多个。
第十三方面，本申请实施例还提供一种芯片系统，包括：处理器，用于执行上述第一方面至第七方面中的任意实现方法。
第十四方面，本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在通信装置上运行时，使得上述第一方面至第七方面中的任意实现方法被执行。
第十五方面，本申请实施例还提供一种计算机程序产品，该计算机程序产品包括计算机程序或指令，当计算机程序或指令被通信装置运行时，使得上述第一方面至第七方面中的任意实现方法被执行。
第十六方面，本申请实施例提供一种通信系统，包括第一终端设备和无线接入网设备。该第一终端设备，用于寻呼消息，该寻呼消息包括至少一个组播会话的标识信息，该第一终端设备处于RRC非激活态；当满足第一条件，触发RRC连接恢复流程；该无线接入网设备，用于向该第一终端设备发送RRC恢复消息，该RRC恢复消息用于触发该第一终端设备进入RRC连接态；其中，该第一条件包括：该至少一个组播会话中包含该第一终端设备加入的组播会话，且该第一终端设备不处于小数据传输过程中；或者，该第一条件包括：该寻呼消息还包括至少一个终端设备的标识信息，该至少一个组播会话中包含该第一终端设备加入的组播会话，该终端设备不处于小数据传输过程中，且该至少一个终端设备的标识信息不包括该第一终端设备的标识信息；该小数据传输为该第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
一种可能的实现方法中，该第一终端设备，具体用于向无线接入网设备发送RRC恢复请求消息。
一种可能的实现方法中，该第一终端设备，还用于当满足第二条件，确定不触发RRC连接恢复流程；其中，该第二条件包括：该至少一个组播会话中包含该第一终端设备加入的组播会话，且该第一终端设备处于小数据传输过程中。
一种可能的实现方法中，该第一终端设备，还用于向无线接入网设备发送指示信息，该指示信息指示非小数据传输的无线承载上有数据和/或信令到达，或者该至少一个组播会话中包含该第一终端设备加入的组播会话。
一种可能的实现方法中，该第一终端设备，还用于当满足第三条件，进入RRC空闲态并触发RRC连接建立流程；其中，该第三条件包括：该寻呼消息还包括至少一个终端设备的标识信息，该至少一个组播会话中包含该第一终端设备加入的组播会话，该终端设备不处于小数据传输过程中，且该至少一个终端设备的标识信息包括该第一终端设备的标识信息。
第十七方面，本申请实施例提供一种通信系统，包括终端设备和无线接入网设备。该无线接入网设备，用于向该终端设备发送第一消息，该第一消息包括至少一个组播会话的标识信息，该终端设备处于RRC非激活态；该终端设备，用于当该至少一个组播会话中包含该终端设备加入的组播会话，且该终端设备处于小数据传输过程中，进入RRC空闲态并触发RRC连接建立流程；其中，该小数据传输为该终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
一种可能的实现方法中，该第一消息是RRC消息或寻呼消息。
第十八方面，本申请实施例提供一种通信系统，该通信系统包括用于实现第四方面任一方法的第一无线接入网设备，和用于实现第七方面任一所述方法的第一终端设备。
第十九方面，本申请实施例提供一种通信系统，该通信系统包括第一终端设备，和用于实现第五方面任一所述方法的第一无线接入网设备。所述第一终端设备，用于接收RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
第二十方面，本申请实施例提供一种通信系统，该通信系统包括第一无线接入网设备，和用于实现第六方面任一所述方法的第二无线接入网设备。所述第一无线接入网设备，用 于接收第一终端设备的终端设备上下文。
附图说明
图1为本申请实施例应用的通信系统的架构示意图；
图2为本申请实施例提供的一种无线通信方法的流程示意图；
图3为本申请实施例提供的一种无线通信方法的流程示意图；
图3(a)为本申请实施例提供的一种无线通信方法的流程示意图；
图3(b)为本申请实施例提供的一种无线通信方法的流程示意图；
图3(c)为本申请实施例提供的一种无线通信方法的流程示意图；
图3(d)为本申请实施例提供的一种无线通信方法的流程示意图；
图3(e)为本申请实施例提供的一种无线通信方法的流程示意图；
图3(f)为本申请实施例提供的一种无线通信方法的流程示意图；
图4为本申请实施例提供的一种通信装置示意图；
图5为本申请实施例提供的一种通信装置示意图。
具体实施方式
图1为本申请实施例应用的通信系统的架构示意图。通信系统1000包括无线接入网100和核心网200，可选的，通信系统1000还包括互联网300。其中，无线接入网100可以包括至少一个无线接入网设备，如图1中的110a和110b，还可以包括至少一个终端设备，如图1中的120a-120j。其中，110a是基站，110b是微站，120a、120e、120f和120j是手机，120b是汽车，120c是加油机，120d是布置在室内或室外的家庭接入节点(home access point，HAP)，120g是笔记本电脑，120h是打印机，120i是无人机。其中，同一个终端设备或无线接入网设备，在不同应用场景中可以提供不同的功能。比如，图1中的手机有120a、120e、120f和120j，手机120a可以接入基站110a，连接汽车120b，与手机120e直连通信以及接入到HAP，手机120b可以接入HAP以及与手机120a直连通信，手机120f可以接入为微站110b，连接笔记本电脑120g，连接打印机120h，手机120j可以控制无人机120i。
终端设备与无线接入网设备相连，无线接入网设备与核心网连接。核心网设备与无线接入网设备可以是独立的不同的物理设备，也可以是将核心网设备的功能与无线接入网设备的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的无线接入网设备的功能。终端设备和终端设备之间以及无线接入网设备和无线接入网设备之间可以通过有线或无线的方式相互连接。图1只是示意图，该通信系统中还可以包括其它网络设备，如还可以包括无线中继设备和无线回传设备，在图1中未画出。
无线接入网设备可以是基站(base station)、演进型基站(evolved NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、第五代(5th generation，5G)移动通信系统中的下一代基站(next generation NodeB，gNB)、第六代(6th generation，6G)移动通信系统中的基站、未来移动通信系统中的基站或无线保真(wireless fidelity，WiFi)系统中的接入节点等；也可以是完成基站部分功能的模块或单元，例如，可以是集中式单元 (central unit，CU)，也可以是分布式单元(distributed unit，DU)。无线接入网设备可以是宏基站(如图1中的110a)，也可以是微基站或室内站(如图1中的110b)，还可以是中继节点或施主节点等。本申请的实施例对无线接入网设备所采用的具体技术和具体设备形态不做限定。
终端设备也可以称为终端、用户设备(user equipment，UE)、移动台、移动终端等。终端设备可以广泛应用于各种场景，例如，设备到设备(device-to-device，D2D)、车物(vehicle to everything，V2X)通信、机器类通信(machine-type communication，MTC)、物联网(internet of things，IOT)、虚拟现实、增强现实、工业控制、自动驾驶、远程医疗、智能电网、智能家具、智能办公、智能穿戴、智能交通、智慧城市等。终端设备可以是手机、平板电脑、带无线收发功能的电脑、可穿戴设备、车辆、无人机、直升机、飞机、轮船、机器人、机械臂、智能家居设备等。本申请的实施例对终端设备所采用的具体技术和具体设备形态不做限定。
无线接入网设备和终端设备可以是固定位置的，也可以是可移动的。无线接入网设备和终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对无线接入网设备和终端设备的应用场景不做限定。
无线接入网设备和终端设备的角色可以是相对的，例如，图1中的直升机或无人机120i可以被配置成移动基站，对于那些通过120i接入到无线接入网100的终端设备120j来说，终端设备120i是基站；但对于基站110a来说，120i是终端设备，即110a与120i之间是通过无线空口协议进行通信的。当然，110a与120i之间也可以是通过基站与基站之间的接口协议进行通信的，此时，相对于110a来说，120i也是基站。因此，无线接入网设备和终端设备都可以统一称为通信装置，图1中的110a和110b可以称为具有无线接入网设备功能的通信装置，图1中的120a-120j可以称为具有终端设备功能的通信装置。
在本申请的实施例中，无线接入网设备的功能也可以由无线接入网设备中的模块(如芯片)来执行，也可以由包含有无线接入网设备功能的控制子系统来执行。这里的包含有无线接入网设备功能的控制子系统可以是智能电网、工业控制、智能交通、智慧城市等上述应用场景中的控制中心。终端设备的功能也可以由终端设备中的模块(如芯片或调制解调器)来执行，也可以由包含有终端设备功能的装置来执行。
为便于理解本申请实施例的方案，下面先介绍本申请实施例中涉及的名词或术语。该名词或术语也作为本发明的一部分。
一、终端设备的状态
目前，终端设备有三种无线资源控制(radio resource control，RRC)状态，分别是RRC连接态(RRC_connected)，RRC空闲态(RRC_idle)和RRC非激活态(RRC_inactive)。
RRC连接态下，终端设备与无线接入网设备之间建立了RRC连接，终端设备与无线接入网设备之间可以进行数据传输。当没有数据传输时，无线接入网设备可以将终端设备释放到RRC空闲态或RRC非激活态。
RRC空闲态下，终端设备与无线接入网设备之间没有建立RRC连接，终端设备与无线接入网设备之间一般不进行数据传输。
RRC非激活态下，无线接入网设备挂起(suspend)RRC连接并维护终端设备的上下文信息。后续当需要恢复到RRC连接态时，由于无线接入网设备中维护有终端设备的上 下文信息，终端设备可以快速恢复到RRC连接态。
二、寻呼
由于终端设备具有移动性，当终端设备处于RRC空闲态或RRC非激活态，网络为了找到该终端设备，可以广播发送寻呼消息，终端设备收到寻呼消息后，可以判断该寻呼消息中是否包含该终端设备的标识信息。如果包含，表明网络在寻呼该终端设备，因此该终端设备可以触发建立RRC连接，进入RRC连接态。
目前存在两种寻呼方式。一种是核心网寻呼，即核心网在跟踪区标识(tracking area identity，TAI)列表指示的跟踪区域(tracking area，TA)内发送寻呼消息。其中，TAI列表中包括一个或多个TAI，一个TAI标识一个TA，一个TA包括一个或多个小区。该寻呼消息也称为核心网寻呼消息。
另一种是基于RAN的通知区域(RAN-based notification area，RNA)寻呼，即无线接入网设备在RNA的范围内发送寻呼消息。其中，一个RNA包括一个或多个小区，并且RNA的范围要小于TA的范围。该寻呼消息也称为RAN寻呼消息或RNA寻呼消息。
三、小数据传输(small data transmission，SDT)
对于处于RRC非激活态的终端设备，为了避免在业务流量较小的情况下进入RRC连接态带来的终端设备的能耗增加，当处于RRC非激活态的终端设备要传输的数据量低于预设阈值时，终端设备可以不进入RRC连接态，而是在RRC非激活态下与无线接入网设备进行数据和/或信令的传输。该过程称为小数据传输。也即，小数据传输指的是终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
小数据传输的方式包括但不限于以下两种方法。
方法一，通过随机接入信道(random access channel，RACH)过程进行小数据传输。
一种方式中，如果该RACH过程是四步RACH，则终端设备可以在MSG3中向无线接入网设备发送上行小数据(也称为SDT UL data)，以及还在MSG3中发送RRC恢复请求(RRCResumeRequest)消息。
另一种方式中，如果该RACH过程是两步RACH，则终端设备可以在MSGA中向无线接入网设备发送上行小数据，以及还在MSGA中发送RRC恢复请求消息。
方法二，通过预配置授权(configured grant，CG)资源进行小数据传输。
终端设备通过CG资源向无线接入网设备发送上行小数据，以及还发送RRC恢复请求消息。该CG资源是无线接入网设备通过RRC释放(RRCRelease)消息中配置给终端设备的。
上述方法一、方法二中，终端设备向无线接入网设备发送的RRC恢复请求消息，用于触发用于小数据传输的RRC连接恢复。
上述小数据传输的方案，使得处于RRC非激活态的终端设备，不需要进入RRC连接态就可以发送小数据，降低了终端设备为了数据量较小的数据传输而进入RRC连接态导致的终端设备的能耗开销。
四、组播通信
组播通信是指相同的服务和相同的数据同时提供给一组特定的终端设备。一般地，网络侧可以通过组播会话向处于RRC连接态的终端设备发送组播业务。当网络侧没有要发送给终端设备的组播会话数据时，网络侧可以让终端设备进入RRC空闲态或RRC非激活态以节约终端设备的能耗。当组播会话被激活或者组播会话的数据到达时，网络侧通过组 通知机制通知处于RRC空闲态或RRC非激活态的终端设备，终端设备接收到组通知后可以重新与网络侧建立连接，以接收组播会话的数据。一旦终端设备离开该组播会话，终端设备可以停止监控与该组播会话相关的组通知。
一种场景中，当组播会话激活后，网络侧寻呼加入该组播会话且处于RRC非激活态的终端设备，此时该终端设备有可能处于小数据传输过程，也有可能没有处于小数据传输过程。此时，终端设备具体需要执行何种操作，有待解决。
图2为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤201，第一终端设备接收寻呼消息。
该第一终端设备处于RRC非激活态。
该寻呼消息是用于组通知的寻呼消息，该寻呼消息中包含至少一个组播会话的标识信息，通知终端设备已经激活的组播会话。当核心网向无线接入网设备通知组播会话已经被激活，或无线接入网设备收到了组播会话的数据时，无线接入网设备可以采用组通知的方式，向加入该组播会话的处于RRC非激活态的终端设备发送寻呼消息，以通知组播会话激活。其中，该寻呼消息中的组播会话的标识信息，可以指示特定公共陆地移动网络(public land mobile network，PLMN)内的特定组播业务。
一种实现方法中，该组播会话可以是组播广播业务(multicast broadcast service，MBS)组播会话，该组播会话的标识信息可以是临时移动组标识(temporary mobile group identifier，TMGI)。
步骤202，当满足第一条件，第一终端设备触发RRC连接恢复流程。
一种实现方法中，该第一条件包括：寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，且第一终端设备不处于小数据传输过程中(SDT procedure is not on-going)。其中，上述至少一个组播会话中包含第一终端设备加入的组播会话，表明该第一终端设备加入的某个或某些组播会话已经激活，或者理解为网络侧有组播会话的数据需要发送给该第一终端设备。本申请实施例中，不处于小数据传输过程中，指的是当前没有进行小数据传输，二者具有相同含义。处于小数据传输过程中，指的是当前正在进行小数据传输，二者具有相同含义。这里做统一描述，后续不赘述。
例如，寻呼消息中包括TMGI_1、TMGI_2、TMGI_3和TMGI_4，表明TMGI_1、TMGI_2、TMGI_3和TMGI_4所标识的组播会话已经激活。如果UE_1已经加入的组播会话的标识信息包括TMGI_5和TMGI_6，则寻呼消息中的至少一个组播会话不包含第一终端设备加入的组播会话，表明网络侧没有组播会话的数据需要发送给该UE_1。如果UE_1已经加入的组播会话的标识信息包括TMGI_1和TMGI_6，则寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，表明网络侧有组播会话的数据需要发送给该UE_1。具体的，网络侧需要向UE_1发送TMGI_1所标识的组播会话的数据。
其中，该第一终端设备触发RRC连接恢复流程，具体可以是：第一终端设备向无线接入网设备发送RRC恢复请求消息，用于请求从RRC非激活态恢复到RRC连接态。无线接入网设备收到RRC恢复请求消息，可以向第一终端设备发送RRC恢复消息，以触发第一终端设备从RRC非激活态恢复到RRC连接态。
上述方案，如果网络侧发送的寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，表明网络侧有组播会话的数据需要发送给第一终端设备，第一终端设备可以向网络侧请求恢复RRC连接以接收组播会话的数据。然而，若第一终端设备收到寻呼消 息后，当前处于小数据传输过程，则表明第一终端设备在收到寻呼消息之前已经向网络侧发送过RRC恢复请求消息，无线接入网设备和第一终端设备之间有可用的数据/信令传输通路，无线接入网设备已知第一终端设备驻留的小区，因此如果网络侧需要让第一终端设备进入RRC连接态接收组播会话，则可以通过该传输通路向第一终端设备发送RRC恢复消息。因此，第一终端设备在收到该寻呼消息之后，如果当前处于小数据传输过程，则无需再次向网络侧发送RRC恢复请求消息，而是可以等待网络侧设备发送RRC恢复消息，该RRC恢复消息可以是响应于第一终端设备在触发小数据传输时发送的RRC恢复请求消息，从而可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
一种实现方法中，上述寻呼消息中还包括至少一个终端设备的标识信息，该至少一个终端设备指的是核心网需要寻呼的终端设备。当寻呼消息中的至少一个终端设备的标识信息(UE-Identity)包括该第一终端设备的标识信息，表明核心网正在寻呼该第一终端设备，所述终端设备的标识信息是与核心网寻呼相关联的标识信息。当寻呼消息中的至少一个终端设备的标识信息不包括该第一终端设备的标识信息，表明核心网没有在寻呼该第一终端设备。所述寻呼消息中的至少一个终端设备的标识信息不包括该第一终端设备的标识信息也可以替换为/理解为，所述寻呼消息中的至少一个终端设备的标识信息与第一终端设备的标识信息不匹配(match)。
一种实现方法中，上述步骤202的第一条件可以替换为：寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，寻呼消息中的至少一个终端设备的标识信息不包括第一终端设备的标识信息，并且第一终端设备不处于小数据传输过程中。也即，当第一终端设备不处于小数据传输过程中，没有被核心网寻呼，但被通知有组播会话激活，则第一终端设备触发RRC连接恢复流程，进入RRC连接态，后续接收网络通过该激活的组播会话发送的数据。
又一种实现方法中，如果不满足上述第一条件，但满足第二条件，则第一终端设备确定不触发RRC连接恢复流程。该第二条件包括：上述寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，且第一终端设备处于小数据传输过程中。也即，当第一终端设备确定第一终端设备的某个或某些组播会话已经激活且网络需要通过该激活的组播会话向第一终端设备发送数据，但该第一终端设备当前处于小数据传输过程中，则第一终端设备确定不触发RRC连接恢复流程。具体的，当第一终端设备处于RRC非激活态，则确定不发送RRC恢复请求消息。这是因为：根据前面介绍的小数据传输的流程可知，第一终端设备处于小数据传输的过程中，已经向无线接入网设备发送过RRC恢复请求消息，第一终端设备和无线接入网设备之间已经保持有可用的信令/数据传输链路，第一终端设备与哪个无线接入网设备保持连接，对于网络侧是可知的，因此第一终端设备不需要再重复发送一次RRC恢复请求消息，从而可以节约信令开销。由于无线接入网设备知晓第一终端设备正在进行小数据传输，且需要向第一终端设备发送组播会话的数据，则无线接入网设备可以在第一终端设备的小数据传输完成之后向第一终端设备发送RRC恢复消息，用于触发第一终端设备进入RRC连接态，然后向处于RRC连接态的第一终端设备发送组播会话的数据，或者无线接入网设备也可以先停止第一终端设备的小数据传输，并向第一终端设备发送RRC恢复消息，用于触发第一终端设备进入RRC连接态，然后向处于RRC连接态的第一终端设备发送组播会话的数据。
又一种实现方法中，如果不满足上述第一条件、第二条件，但满足第三条件，则第一 终端设备进入RRC空闲态并触发RRC连接建立流程。该第三条件包括：上述寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，上述寻呼消息中的至少一个终端设备的标识信息包括第一终端设备的标识信息，并且第一终端设备不处于小数据传输过程中。也即，当第一终端设备不处于小数据传输过程中，但被核心网寻呼，以及还被通知有组播会话激活，则第一终端设备进入RRC空闲态并触发RRC连接建立流程，后续接收网络通过该激活的组播会话发送的数据。
一种可能的实现方法中，不管满足上述第一条件、第二条件还是第三条件，表明上述寻呼消息中的至少一个组播会话包含第一终端设备加入的组播会话，因此第一终端设备可以向无线接入网设备发送指示信息，该指示信息指示上述寻呼消息中的至少一个组播会话包含第一终端设备中的某个或某些加入的组播会话，或者指示第一终端设备中的某个或某些加入的组播会话已经激活，或者指示组播业务到达，或者指示非小数据传输的无线承载上有数据和/或信令到达(arrival of data and/or signaling mapped to radio bearers not configured for SDT)。可选的，该指示信息可以携带于辅助信息(UEAssistanceInformation)中发送至无线接入网设备。可选的，该指示信息是非SDT数据指示信息(nonSDT-DataIndication)。
上述方案，根据第一终端设备发送的指示信息，无线接入网设备可以获知第一终端设备在非小数据传输的无线承载上有数据或信令到达，或者获知第一终端设备期望进入RRC连接态接收组播会话，有助于无线接入网设备判断是否要让第一终端设备恢复RRC连接态，便于后续无线接入网设备与第一终端设备之间的正确通信。比如，如果第一终端设备在收到寻呼消息后，不期望进入RRC连接态接收该寻呼消息中指示的组播会话，或已经释放了该组播会话，则第一终端设备可以不向无线接入网设备发送该指示信息，无线接入网设备就不需要让第一终端设备进入RRC连接态。
下面介绍关于终端设备是否需要监听寻呼消息的一个实施例。
一种实现方法中，处于RRC非激活态的终端设备可以根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，该寻呼消息包含至少一个组播会话的标识信息，该终端设备加入了一个或多个组播会话。关于该寻呼消息的详细描述可以参考前述步骤201中的描述。该方案，终端设备根据小数据传输的状态决定监听用于组通知的寻呼消息或不监听用于组通知的寻呼消息，而不是始终监听用于组通知的寻呼消息，有助于节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
下面介绍终端设备根据小数据传输的状态判断是否监听用于组通知的寻呼消息的不同实现方法。
实现方法一，当终端设备未在进行小数据传输，则终端设备监听寻呼消息。
该方案，当处于RRC非激活态的终端设备未在进行小数据传输，表明无线接入网设备不知道终端设备驻留在哪个小区上，终端设备和无线接入网设备之间也没有可用的数据/信令通路，因此终端设备需要通过监听寻呼的方式，及时地判断网络侧是否发送了用于通知已经激活的组播会话的寻呼消息，以保证能够及时接收组播会话的数据。
实现方法二，当终端设备正在进行小数据传输，则终端设备不监听寻呼消息。
该方案，若终端设备当前处于小数据传输过程，则表明无线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接 态接收组播会话，则可以向终端设备发送RRC恢复消息，因此终端设备不需要监听用于通知组播会话已经激活的寻呼消息，无需解码承载寻呼消息的PDSCH上的数据块，从而可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
针对上述实现方法二，由于终端设备正在进行小数据传输，因此终端设备和无线接入网设备之间存在可用的数据/信令通路，因此无线接入网设备可以通过该通路向终端设备发送RRC消息，该RRC消息包括至少一个组播会话的标识信息，该RRC消息用于指示至少一个组播会话已经被激活，可选的，该RRC消息还指示终端设备保持在RRC非激活态接收组播会话。当至少一个组播会话中包含终端设备加入的组播会话，终端设备在RRC非激活态下接收加入的组播会话。用于组通知的寻呼消息是广播消息，该寻呼消息是在初始(initial)带宽部分(bandwidth part，BWP)上发送的。若终端设备当前进行小数据传输的BWP带宽范围与initial BWP的带宽范围的总和超出终端设备支持的带宽(例如该终端设备为低能力终端设备)，则终端设备不能同时进行小数据传输和接收寻呼消息。如果终端设备在小数据传输过程中要接收组寻呼，则需要将BWP切换到initial BWP上以接收组寻呼，这会导致小数据传输过程中的数据丢包。但通过上述方案，终端设备可以在小数据传输的BWP上通过专用信令(即RRC消息)接收用于通知组播会话已经激活的通知，而不是通过寻呼消息通知组播会话已经激活，因此无需进行BWP切换，可以避免丢包，以及降低终端设备的实现复杂度。
实现方法三，当终端设备正在进行小数据传输，且终端设备不支持在RRC非激活态接收组播会话，则终端设备不监听寻呼消息。
该方案，若终端设备当前处于小数据传输过程，则表明无线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息。并且由于该终端设备不支持在RRC非激活态接收组播会话，因此终端设备需要进入到RRC连接态才接收组播会话的数据，进而终端设备可以不监听用于通知组播会话已经激活的寻呼消息，无需解码承载寻呼消息的PDSCH上的数据块，而是等待网络侧主动通知终端设备进入RRC连接态，因而该方案可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
实现方法四，当终端设备正在进行小数据传输，且终端设备支持在RRC非激活态接收组播会话，则终端设备监听寻呼消息。
若终端设备当前处于小数据传输过程，则表明无线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息，以触发终端设备进入RRC连接态接收组播会话，因此一般情况下，终端设备可以不需要监听用于通知组播会话已经激活的寻呼消息，只需要等待无线接入网设备发送的RRC恢复消息。然而，在该方案中，若终端设备正在进行小数据传输，且该终端设备支持在RRC非激活态接收组播会话，则该终端设备需要监听该寻呼消息，这是因为：由于终端设备支持在RRC非激活态接收组播会话，因而无线接入网设备可能不向终端设备发送RRC恢复消息以触发终端设备进入RRC连接态并在RRC连接态接收组播会话的数据，因此终端设备需要主动监听寻呼消息，以获知组播会话是否已经被激活，避免错过网络下发的组播会话的数据，当终端设备监听到组播会 话已经被激活，则可以在RRC非激活态下接收组播会话的数据。
实现方法五，当终端设备正在进行小数据传输，终端设备支持在RRC非激活态接收组播会话，且终端设备驻留的小区支持为处于非激活态的终端设备提供组播会话，则终端设备监听寻呼消息。
其中，该终端设备驻留的小区为处于非激活态的终端设备提供的组播会话，是该终端设备已经加入的组播会话。由于终端设备支持在RRC非激活态接收组播会话，且当前驻留小区支持将该组播会话发送给处于RRC非激活态的终端设备，因而无线接入网设备可能不向终端设备发送RRC恢复消息以触发终端设备进入RRC连接态并在RRC连接态接收组播会话的数据，因此终端设备需要主动监听寻呼消息，以获知组播会话是否已经被激活，避免错过网络下发的组播会话的数据。当终端设备监听到组播会话已经被激活，则可以在RRC非激活态下接收组播会话的数据。
上述方案，需要保证该终端设备驻留的小区支持为处于非激活态的终端设备提供组播会话的情况下，终端设备在监听寻呼消息，以避免终端设备做无效的监听，有助于节约不必要的能耗开销。
图3为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301，终端设备接收第一消息。
该第一消息可以是寻呼消息或RRC消息。
当第一消息是寻呼消息，该寻呼消息的具体内容和实现方式，与上述步骤201中的寻呼消息的具体内容和实现方式相同，可以参考前述描述。
当第一消息是RRC消息，该RRC消息包括至少一个组播会话的标识信息，RRC消息用于指示至少一个组播会话已经被激活，该RRC消息是一个单播消息或专用信令。
步骤302，当至少一个组播会话中包含终端设备加入的组播会话，且终端设备处于小数据传输过程中，终端设备进入RRC空闲态并触发RRC连接建立流程。
当第一消息中的至少一个组播会话中包含终端设备加入的组播会话，表明该终端设备加入的某个或某些组播会话已经激活，或者理解为网络侧有组播会话的数据需要发送给该终端设备。
上述方案，如果网络侧发送的第一消息中的至少一个组播会话包含终端设备加入的组播会话，表明网络侧有组播会话的数据需要发送给终端设备，终端设备可以向网络侧请求恢复RRC连接以接收组播会话的数据。然而，若终端设备收到寻呼消息后，当前处于小数据传输过程，则表明线接入网设备已知终端设备驻留在哪个小区上，终端设备和无线接入网设备之间存在可用的数据/信令通路，终端设备在收到寻呼消息之前已经向网络侧发送过RRC恢复请求消息，因此如果网络侧需要让终端设备进入RRC连接态接收组播会话，则可以向终端设备发送RRC恢复消息。因此，终端设备在收到该寻呼消息之后，如果当前处于小数据传输过程，则无需再次向网络侧发送RRC恢复请求消息，而是可以直接进入RRC空闲态并触发RRC连接建立流程，从而可以实现快速进入RRC连接态并接收组播会话的数据，以及可以节约不必要的能耗开销，降低终端设备处理复杂度，降低信令开销。
由于终端设备在RRC非激活态会进行移动，如果终端设备当前接入的无线接入网设备(也称为服务接入网设备(serving gNB)，接收接入网设备(receving gNB)，或第一无线接入网设备)不是最后服务无线接入网设备(last serving gNB,也称为锚点接入网设备 (anchor gNB)或第二无线接入网设备)，则终端设备在触发小数据传输流程后，第一无线接入网设备会执行检索终端设备上下文(retrieve UE context)流程。第一无线接入网设备向第二无线接入网设备发送检索终端设备上下文请求消息，其中指示小数据传输(SDT)请求，第二无线接入网设备决定是否重新定位终端设备上下文(UE context relocation)。
其中，最后服务无线接入网设备或锚点接入网设备，指的是终端设备进入到RRC非激活态之前，在RRC连接态最后为该终端设备提供服务的无线接入网设备或该终端设备最后接入的无线接入网设备，或者理解为，保持该终端设备与核心网之间连接的无线接入网设备。
情形一，有上下文重定位的小数据传输(SDT with UE context relocation)。
如果第二无线接入网设备决定重新定位完整的终端设备上下文，则将完整的终端设备上下文发送给第一无线接入网设备，这称为有上下文重定位的小数据传输。这种情况下，上行小数据从第一无线接入网设备发送给用户面功能(user plane funciton，UPF)网元。小数据传输结束后，第一无线接入网设备可以向终端设备发送RRC释放(RRCRelease)消息，将终端设备释放到RRC非激活态或RRC空闲态。如果小数据传输过程中有下行非小数据/信令到达，或上行非小数据到达，第一无线接入网设备可以向终端设备发送RRC恢复(RRCResume)消息让终端设备回到RRC连接态。
情形二，无上下文重定位的小数据传输(SDT without UE context relocation)。
如果第二无线接入网设备决定不重新定位完整的终端设备上下文，则向第一无线接入网设备发送部分终端设备上下文(partial UE context)，其中包含处理小数据传输所需的SDT无线链路控制(radio link control，RLC)上下文信息，这称为无上下文重定位的小数据传输。第二无线接入网设备保持分组数据汇聚协议(packet data convergence protocol，PDCP)实体，而第一无线接入网设备会建立SDT相关的RLC上下文，将小数据/信令转发给第二无线接入网设备，然后由第二无线接入网设备发送给核心网。
下面结合图3(a)至图3(e)的实施例，介绍当终端设备在RRC非激活态下进行小数据传输时，如果该终端设备加入的某个或某些组播会话被激活，也即有组播业务需要传输，如何定义终端设备、第一无线接入网设备以及第二无线接入网设备的行为。其中，以下图3(a)至图3(e)的实施例是针对上述情形二，以下图3(f)是针对上述情形一。
需要说明的是，以下图3(a)至图3(f)的实施例均可以独立实施，也可以去前述图2或图3实施例相结合实施例，本申请对此不限定。
图3(a)为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301a，第一终端设备向第一无线接入网设备发送RRC恢复请求消息。
该RRC恢复请求消息用于触发小数据传输(SDT)。
比如，该RRC恢复请求消息承载在第一终端设备发送的随机接入消息3(MSG3)或随机接入消息A(MSGA)中。
需要说明的是，该RRC恢复请求消息的名称也可以发生变化，比如称为RRC消息、RRC请求消息等。
该第一终端设备支持在RRC非激活态下接收组播业务，且该第一终端设备加入了一个或多个组播会话。本申请中的组播会话、组播业务、组播在一些地方可以相互替换，其表示相同含义。
步骤302a，第一无线接入网设备向第二无线接入网设备发送上下文请求消息。
该上下文请求消息也称为检索UE上下文请求(RETRIEVE UE CONTEXT REQUEST)消息、上下文检索请求消息或检索请求消息等。这里做统一说明，后面不再赘述。
该上下文请求消息用于请求获取该第一终端设备的小数据传输相关的上下文，也称为小数据传输上下文。
步骤303a，第二无线接入网设备向第一无线接入网设备发送该第一终端设备的部分上下文(PARTIAL UE CONTEXT)。
所述部分上下文包括用于小数据传输的上下文(SDT related context)。
该第一终端设备的小数据传输上下文是该第一终端设备的终端设备上下文中的部分内容，该第一终端设备的终端设备上下文也称为该第一终端设备的完整上下文(full UE context)。
示例性的，所述部分上下文携带在部分上下文传输(PARTIAL UE CONTEXT TRANSTER)消息中发送至第一无线接入网设备。
步骤304a，第一无线接入网设备收到第一寻呼消息。
该第一寻呼消息来自第二无线接入网设备或核心网设备。示例性地，如果该第一寻呼消息来自第二无线接入网设备，该第一寻呼消息也可以称为RAN多播组寻呼(RAN multicast group paging)消息。示例性地，如果该第一寻呼消息来自接入与移动性管理功能(access and mobility management function，AMF)网元，该第一寻呼消息也可以称为多播组寻呼(multicast group paging)消息。这里做统一说明，后续不赘述。
该第一寻呼消息中包括一个或多个组播会话的标识，该第一寻呼消息用于通知一个或多个组播会话激活。可选的，该第一寻呼消息还包括用于寻呼终端设备的信息，可以是发送寻呼的位置，也可以是用于确定发送寻呼位置的信息或用于确定寻呼时机(paging occasion)的信息，该用于寻呼终端设备的信息是根据加入该至少一个组播会话的终端设备的标识确定的。示例性的，该用于寻呼终端设备的信息为终端设备的标识5G-S-TMSI对1024取模后的值。
步骤305a，第一无线接入网设备发送第二寻呼消息。
该第二寻呼消息是根据第一寻呼消息得到的。该第二寻呼消息指示至少一个组播会话激活。也即指示至少一个组播会话处于激活状态或为激活状态，或指示至少一个组播会话从非激活状态转化为激活状态，这里统一说明，后面不赘述。该至少一个组播会话可以与第一寻呼消息中的一个或多个组播会话相同，或者是第一寻呼消息中的一个或多个组播会话的子集。在另一种实现方法中，第一无线接入网设备可以从第二无线接入网设备接收一个第一寻呼消息，以及从核心网设备接收另一个第一寻呼消息，然后分别从该两个第一寻呼消息中获取部分组播会话的标识，并根据获取到的组播会话的标识生成第二寻呼消息。
一种可能的方式中，第二寻呼消息还用于指示处于RRC连接态的终端设备接收该至少一个组播会话。也即处于RRC连接态的终端设备可以接收该至少一个组播会话，处于RRC非连接态的终端设备不能接收该至少一个组播会话。或者也可以理解为：该至少一个组播会话是为RRC连接态的终端设备提供的组播会话。或者也可以理解为：该至少一个组播会话是终端设备在RRC连接态接收的组播会话。示例性地，第二寻呼消息包括第一组播会话标识列表，该第一组播会话标识列表指示至少一个激活的组播会话的标识，该第一组播会话标识列表指示的组播会话是在RRC连接态接收的组播会话。
又一种可能的方式中，第二寻呼消息还用于指示该至少一个组播会话为处于RRC连 接态或RRC非连接态终端设备接收的组播会话。也即第二寻呼消息还指示了该至少一个组播会话中的每个组播会话是由终端设备在RRC连接态接收，还是由终端设备在非RRC连接态接收。示例性地，第二寻呼消息包括第二组播会话标识列表，该第二组播会话标识列表包括至少一个激活的组播会话的标识以及每个组播会话对应的指示信息，该指示信息用于指示该组播会话为RRC连接态或RRC非连接态接收的组播会话，RRC非连接态可以为RRC非激活态和/或RRC空闲态。比如以指示信息是1比特信息为例，当指示信息为1表示组播会话为RRC连接态接收的组播会话，当指示信息为0表示组播会话为非RRC连接态接收的组播会话。假设第二组播会话标识列表包括组播会话1的标识、组播会话2的标识、组播会话1对应的指示信息以及组播会话2对应的指示信息，且组播会话1对应的指示信息为0，组播会话2对应的指示信息为1，因此组播会话1由处于非RRC连接态的终端设备接收，组播会话2由处于RRC连接态的终端设备接收。此外，还可以用是否包含指示信息来指示组播会话为RRC连接态或RRC非连接态接收的组播会话，比如当第二组播会话标识列表中包含组播会话1的标识以及包括该组播会话1对应的指示信息，则表示该组播会话1为非RRC连接态接收的组播会话；当第二组播会话标识列表中包含组播会话1的标识，则表示该组播会话1为RRC连接态接收的组播会话。
由于第一无线接入网设备没有完整的终端设备上下文，第一无线接入网设备收到第一寻呼消息后，并不知道哪个终端设备加入或想要接收该第一寻呼消息中指示的激活的组播会话。因此，第一无线接入网设备可以通过发送第一寻呼消息来通知终端设备组播会话激活，当第二寻呼消息中包括用于寻呼终端设备的信息(例如用于确定寻呼时机的信息)时，第一无线接入网设备根据第二寻呼消息确定发送第一寻呼消息的位置；当第二寻呼消息中不包括用于寻呼终端设备的信息时，第一无线接入网设备在至少一个默认寻呼周期的所有寻呼时机(paging occasion)上发送第一寻呼消息。
这种场景下，当第一无线接入网设备期望终端设备进入RRC连接态接收上述激活的组播会话时，由于第一无线接入网设备不能确定SDT过程中的终端设备是加入或想要接收激活的组播会话的终端设备，因此不能直接向终端设备发送RRC恢复消息指示终端设备进入RRC连接态。此处，终端设备和/或第一无线接入网设备可以支持RRC非激活态的组播，也可以仅支持RRC连接态的组播，本发明不限定。
步骤306a，第一终端设备向第一无线接入网设备发送指示信息。
第一终端设备监听寻呼，如果收到第二寻呼消息，且上述第二寻呼消息指示第一终端设备加入的至少一个组播会话激活，则向第一无线接入网设备发送指示信息，该指示信息包括指示非小数据传输数据指示，和/或组播原因值。其中，组播原因值也称为组播的原因值，或组播相关的原因值，组播原因值也可以理解为与组播相关的RRC恢复原因值。
具体的，非小数据传输数据指示(nonSDT-DataIndication)，用于指示在小数据传输过程中，非小数据传输的无线承载上有数据和/或信令到达。上述数据和/或信令到达可以理解为有上行数据和/或信令到达或即将到达该第一终端设备，也可以理解为有下行数据和/或信令到达或即将到达该第一终端设备。
具体的，该组播原因值可以指示上述至少一个组播会话中包含该第一终端设备加入的组播会话，或者该第一终端设备加入的组播会话激活，或者第一终端设备进入RRC连接态接收组播。该组播原因值也可以为组播相关的接入类型，例如MBS-access。
示例性地，该指示信息可以为用户辅助信息(UE assistant information，UAI)中，或 者是承载在UAI中的信息。
第一终端设备处于SDT过程。
步骤307a，第一无线接入网设备根据指示信息，向第二无线接入网设备发送上下文请求消息。
第一无线接入网设备收到指示信息，则确定该第一终端设备的组播会话被激活，也即第一终端设备期望进入RRC连接态接收激活的组播会话，因此第一无线接入网设备向第二无线接入网设备发送上下文请求消息，以请求该第一终端设备的完整的上下文。
步骤308a，第二无线接入网设备向第一无线接入网设备发送该第一终端设备的终端设备上下文。
该终端设备上下文即为该终端设备的完整上下文(full UE context)。
示例性地，该终端设备上下文携带于上下文响应消息中发送至第一无线接入网设备。该上下文响应消息也称为检索UE上下文响应(RETRIEVE UE CONTEXT RESPONSE)消息、上下文检索响应消息或检索响应消息等。这里做统一说明，后面不再赘述。
步骤309a，第一无线接入网设备向第一终端设备发送RRC恢复消息。
该RRC恢复消息用于恢复第一终端设备的RRC连接。
上述方案，在第一终端设备进行小数据传输时，若该第一终端设备收到第二寻呼消息指示加入的某个或某些组播会话被激活，且指示在RRC连接态接收该组播会话，则该第一终端设备向第一无线接入网设备发送指示信息，从而第一无线接入网设备确定第一终端设备是期望进入RRC连接态接收激活的组播会话的终端设备，从而向最后服务接入网设备(第二无线接入网设备)检索到终端设备的完整上下文后，指示该第一终端设备恢复RRC连接态，能够避免不必要的信令开销，并有助于该第一终端设备更快地进入RRC连接态开始接收组播会话。
图3(b)为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301b，第一终端设备向第一无线接入网设备发送RRC恢复请求消息。
该RRC恢复请求消息用于触发SDT。
比如，该RRC恢复请求消息承载在第一终端设备发送的随机接入消息3(MSG3)或随机接入消息A(MSGA)中。
需要说明的是，该RRC恢复请求消息的名称也可以发生变化，比如称为RRC消息、RRC请求消息等。
该第一终端设备支持在RRC非激活态下接收组播业务，且该第一终端设备加入了一个或多个组播会话。
步骤302b，第一无线接入网设备向第二无线接入网设备发送上下文请求消息。
该上下文请求消息用于请求获取该第一终端设备的上下文以用于小数据传输。一种可能的实现方式为，该上下文请求消息中包括小数据传输指示字段。
步骤303b，第二无线接入网设备向第一无线接入网设备发送该第一终端设备的部分上下文，包括小数据传输上下文和组播相关的上下文。
该第一终端设备的小数据传输上下文和组播相关的上下文是该第一终端设备的终端设备上下文中的部分内容，该终端设备上下文也称为该第一终端设备的完整上下文。
该组播相关的上下文中可以为该第一终端设备加入的组播会话的标识，或者包括该第一终端设备加入的组播会话的标识，可选的还包括组播会话的点对多点(point to multipoint， PTM)配置。
步骤304b，第一无线接入网设备收到第一寻呼消息。
该第一寻呼消息来自第二无线接入网设备或核心网设备。
该第一寻呼消息中包括一个或多个组播会话的标识，该第一寻呼消息用于通知一个或多个组播会话激活。该一个或多个组播会话也即为激活的组播会话，或激活的组播会话的子集。
步骤305b，第一无线接入网设备向第一终端设备发送第二寻呼消息。
由于第一无线接入网设备获取到了该第一终端设备的组播相关的上下文，因此知晓该第一终端设备加入的组播会话。如果第一寻呼消息中的一个或多个组播会话的标识包括该第一终端设备加入的组播会话的标识，则向该第一终端设备发送第二寻呼消息，该第二寻呼消息指示至少一个组播会话激活，该至少一个组播会话包括第一终端设备加入的组播会话。
该第二寻呼消息是根据第一寻呼消息确定的，或者理解为，该第二寻呼消息是由第一寻呼消息触发的。该第二寻呼消息可以与第一寻呼消息可以相同，也可以不同。
步骤306b，第一无线接入网设备向第二无线接入网设备发送上下文请求消息。
第一无线接入网设备确定激活的至少一个组播会话中包括该第一终端设备加入的组播会话，则第一无线接入网设备向第二无线接入网设备发送上下文请求消息，以请求该第一终端设备的完整的上下文。
步骤307b，第二无线接入网设备向第一无线接入网设备发送该第一终端设备的终端设备上下文。
该终端设备上下文即为该第一终端设备的完整上下文。
示例性地，该终端设备上下文携带于上下文响应消息中发送至第一无线接入网设备。
步骤308b，第一无线接入网设备向第一终端设备发送RRC恢复消息。
该RRC恢复消息用于恢复第一终端设备的RRC连接。
上述方案，在无上下文重定位的SDT场景下，第二无线接入网设备向第一无线接入网设备发送的部分上下文中还包括组播相关的上下文，第一无线接入网设备根据组播相关的上下文能够确定该第一终端设备加入的某个或某些组播会话被激活，从而当第一无线接入网设备期望第一终端设备进入RRC连接态接收激活的组播会话的情况下，从而向最后服务接入网设备(第二无线接入网设备)检索到完整终端设备上下文后，指示该第一终端设备恢复RRC连接态，能够避免不必要的信令开销，并有助于该第一终端设备更快地进入RRC连接态开始接收组播会话。
图3(c)为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301c至步骤306c，同图3(a)实施例的步骤301a至步骤306a。
步骤307c，第一无线接入网设备根据指示信息，向第二无线接入网设备发送上下文确认消息。
第一无线接入网设备收到指示信息，则确定该第一终端设备的组播会话被激活，也即第二寻呼消息中的至少一个组播会话的标识中包括该第一终端设备加入的组播会话的标识，因此第一无线接入网设备向第二无线接入网设备发送上下文确认消息，以请求结束该第一终端设备的小数据传输。
该上下文确认消息也称为检索UE上下文确认(RETRIEVE UE CONTEXT CONFIRM) 消息、上下文检索确认消息、检索确认消息或者其它名称。
步骤308c，第二无线接入网设备向第一无线接入网设备发送上下文失败消息。
该上下文失败消息也称为检索UE上下文失败(RETRIEVE UE CONTEXTFAILURE)消息、上下文检索失败消息、检索失败消息或者其它名称。
上述上下文失败消息用于结束该第一终端设备的小数据传输。
该上下文失败消息中包括封装的RRC释放消息，用于指示将第一终端设备释放到RRC非激活态或RRC空闲态。
步骤309c，第一无线接入网设备向第一终端设备发送RRC释放消息。
第一终端设备根据该RRC释放消息，释放到RRC非激活态或RRC空闲态。
步骤310c，第一终端设备向第一无线接入网设备发送RRC恢复请求消息或RRC建立请求消息。
RRC恢复请求消息用于指示进入(或恢复)到RRC连接态。
RRC建立请求消息用于请求建立RRC连接。
步骤311c，第一无线接入网设备向第一终端设备发送RRC恢复消息。
该RRC恢复消息用于恢复第一终端设备的RRC连接。
第一终端设备收到RRC恢复消息，进入RRC连接态。
在第一无线接入网设备向第一终端设备发送RRC恢复消息之前，第一无线接入网设备从第二无线接入网设备获取该第一终端设备的上下文。
上述方案，在无上下文重定位的小数据传输过程中，若该第一终端设备加入的某个或某些组播会话被激活，且第一无线接入网设备指示进入RRC连接态接收激活的组播会话，则在无线接入网设备侧可以复用现有的非SDT数据到达的流程，先结束SDT再让终端设备进入RRC连接态，和现有流程兼容性较好。
图3(d)为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301d至步骤305d，同图3(b)实施例的步骤301b至步骤305b。
步骤306d至步骤310d，同图3(c)实施例的步骤307c至步骤311c。
上述方案，在无上下文重定位的小数据传输过程中，若该第一终端设备加入的某个或某些组播会话被激活，且第一无线接入网设备指示进入RRC连接态接收激活的组播会话，则在无线接入网设备侧可以复用现有的非SDT数据到达的流程，先结束SDT再让终端设备进入RRC连接态，和现有流程兼容性较好。
图3(e)为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301e至步骤303e，同图3(a)实施例的步骤301a至步骤303a。
步骤304e，第二无线接入网设备向第一无线接入网设备发送第一终端设备的终端设备上下文。
第二无线接入网设备确定至少一个组播会话被激活，且确定加入该至少一个组播会话的终端设备中包括第一终端设备，则向第一无线接入网设备发送该第一终端设备的终端设备上下文。
该第一终端设备的终端设备上下文也称为该第一终端设备的完整上下文。
可选的，该第一终端设备的终端设备上下文中包括该第一终端设备的组播相关的上下文。该组播相关的上下文中可以为该第一终端设备加入的组播会话的标识，或者包括该第一终端设备加入的组播会话的标识，可选的还包括组播会话的PTM配置。
步骤305e，第一无线接入网设备收到第一寻呼消息。
该第一寻呼消息来自第二无线接入网设备或核心网设备。
该第一寻呼消息中包括一个或多个组播会话的标识，该第一寻呼消息用于通知一个或多个组播会话激活。该一个或多个组播会话也即为激活的组播会话，或激活的组播会话的子集。
上述步骤304e与步骤305e之间的先后顺序不限。
步骤306e，第一无线接入网设备向第一终端设备发送第二寻呼消息。
该步骤为可选步骤。
由于第一无线接入网设备获取到了该第一终端设备的终端设备上下文，因此根据上述第一寻呼消息和第一终端设备的终端设备上下文，确定该第一终端设备加入的某个或某些组播会话被激活，进而向该第一终端设备发送第二寻呼消息，该第二寻呼消息指示该第一终端设备进入RRC连接态接收组播业务。
该第二寻呼消息可以与第一寻呼消息可以相同，也可以不同。
步骤307e，第一无线接入网设备向第一终端设备发送RRC恢复消息。
该RRC恢复消息用于恢复第一终端设备的RRC连接。
一种实现方法中，该步骤307e也可以替换为图3(d)实施例中的步骤308d至步骤310d。
上述方案，可以避免在由SDT触发的部分上下文传输中不必要地包含组播相关的上下文，因为SDT过程中不一定有终端设备接收的组播会话被激活，如此可以降低无线接入网设备之间接口上的信令开销。在无上下文重定位的SDT场景下，由于第二无线接入网设备是保存了终端设备完整上下文的网络设备，因此可以当判断在第一终端设备加入的或者想要接收的组播会话中有至少一个组播会话被激活的条件下，再向第一无线接入网设备发送第一终端设备的终端设备上下文，从而降低信令开销和第一无线接入网设备的存储开销。
图3(f)为本申请实施例提供的一种无线通信方法的流程示意图。该方法包括以下步骤：
步骤301f，第一终端设备向第一无线接入网设备发送RRC恢复请求消息。
该RRC恢复请求消息用于触发SDT。
比如，该RRC恢复请求消息承载在第一终端设备发送的随机接入消息3(MSG3)或随机接入消息A(MSGA)中。
需要说明的是，该RRC恢复请求消息的名称也可以发生变化，比如称为RRC消息、RRC请求消息等。
该第一终端设备支持在RRC非激活态下接收组播业务，且该第一终端设备加入了一个或多个组播会话。
步骤302f，第一无线接入网设备向第二无线接入网设备发送上下文请求消息。
该上下文请求消息用于获取该第一终端设备的上下文。
步骤303f，第二无线接入网设备向第一无线接入网设备发送该第一终端设备的终端设备上下文。
该第一终端设备的终端设备上下文也称为该第一终端设备的完整上下文。
该终端设备上下文中包括组播相关的上下文，该组播相关的上下文中可以为该第一终端设备加入的组播会话的标识，或者包括该第一终端设备加入的组播会话的标识，可选的还包括组播会话的PTM配置。
步骤304f，第一无线接入网设备收到第一寻呼消息。
该第一寻呼消息来自第二无线接入网设备或核心网设备。
该第一寻呼消息中包括一个或多个组播会话的标识，该第一寻呼消息指示加入该一个或多个组播会话的终端设备进入RRC连接态接收组播。该一个或多个组播会话也即为激活的组播会话，或激活的组播会话的子集。
步骤305f，第一无线接入网设备向第一终端设备发送RRC恢复消息。
该RRC恢复消息用于恢复第一终端设备的RRC连接。
第一无线接入网设备根据第一终端设备的组播相关的上下文以及第一寻呼消息，确定第一终端设备加入的组播会话被激活，进而向第一终端设备发送RRC恢复消息。
一种实现方法中，该步骤305f也可以替换为图3(d)实施例中的步骤308d至步骤310d。
上述方案，在有上下文重定位的小数据传输过程中，若该第一终端设备加入的某个或某些组播会话被激活，且第一无线接入网设备指示进入RRC连接态接收激活的组播会话，则触发该第一终端设备进入RRC连接态，从而有助于该第一终端设备正确接收组播会话的组播业务。
在另一个实施例中，若第一终端设备支持在RRC非激活态接收组播(或组播业务)，也即第一终端设备加入了组播会话，如果第一终端设备在进行小数据传输期间收到了寻呼消息，且该寻呼消息用于指示该第一终端设备保持在RRC非激活态接收组播业务，则第一终端设备根据该寻呼消息保持在RRC非激活态，并在RRC非激活态下接收组播业务。
可以理解的是，为了实现上述实施例中功能，终端设备(或第一终端设备)包括了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本申请中所公开的实施例描述的各示例的单元及方法步骤，本申请能够以硬件或硬件和计算机软件相结合的形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用场景和设计约束条件。
图4和图5为本申请的实施例提供的可能的通信装置的结构示意图。这些通信装置可以用于实现上述方法实施例中终端设备的功能，因此也能实现上述方法实施例所具备的有益效果。在本申请的实施例中，该通信装置可以是如图1所示的终端设备120a-120j中的一个，也可以是应用于终端设备的模块(如芯片)。
图4所示的通信装置400包括处理单元410和收发单元420。通信装置400用于实现上述方法实施例中终端设备的功能。
当通信装置400用于实现上述方法实施例中第一终端设备的功能，收发单元420，用于接收寻呼消息，该寻呼消息包括至少一个组播会话的标识信息，该第一终端设备处于RRC非激活态；处理单元410，用于当满足第一条件，触发RRC连接恢复流程；其中，该第一条件包括：该至少一个组播会话中包含该第一终端设备加入的组播会话，且该第一终端设备不处于小数据传输过程中；或者，该第一条件包括：该寻呼消息还包括至少一个终端设备的标识信息，该至少一个组播会话中包含该第一终端设备加入的组播会话，该终端设备不处于小数据传输过程中，且该至少一个终端设备的标识信息不包括该第一终端设备的标识信息；该小数据传输为该第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
一种可能的实现方法中，处理单元410，用于通过收发单元420向无线接入网设备发送RRC恢复请求消息。
一种可能的实现方法中，处理单元410，还用于当满足第二条件，确定不触发RRC连 接恢复流程；其中，该第二条件包括：该至少一个组播会话中包含该第一终端设备加入的组播会话，且该第一终端设备处于小数据传输过程中。
一种可能的实现方法中，收发单元420，还用于向无线接入网设备发送指示信息，该指示信息指示非小数据传输的无线承载上有数据和/或信令到达，或者该至少一个组播会话中包含该第一终端设备加入的组播会话，或者该第一终端设备加入的组播会话已经激活。
一种可能的实现方法中，处理单元410，还用于当满足第三条件，进入RRC空闲态并触发RRC连接建立流程；其中，该第三条件包括：该寻呼消息还包括至少一个终端设备的标识信息，该至少一个组播会话中包含该第一终端设备加入的组播会话，该终端设备不处于小数据传输过程中，且该至少一个终端设备的标识信息包括该第一终端设备的标识信息。
当通信装置400用于实现上述方法实施例中终端设备的功能，处理单元410，用于终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，该终端设备处于RRC非激活态，该寻呼消息包含至少一个组播会话的标识信息；其中，该终端设备加入了一个或多个组播会话，该小数据传输为该第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
一种可能的实现方法中，处理单元410，具体用于当终端设备未在进行小数据传输，则监听该寻呼消息。
一种可能的实现方法中，处理单元410，具体用于当终端设备正在进行小数据传输，则不监听该寻呼消息。
一种可能的实现方法中，处理单元410，具体用于当终端设备正在进行小数据传输，且该终端设备不支持在RRC非激活态接收组播会话，则不监听该寻呼消息。
一种可能的实现方法中，收发单元420，用于接收RRC消息，该RRC消息包括该至少一个组播会话的标识信息，该RRC消息用于指示该至少一个组播会话已经被激活；当该至少一个组播会话中包含该终端设备加入的组播会话，该终端设备在RRC非激活态下接收该终端设备加入的组播会话。
一种可能的实现方法中，处理单元410，具体用于当终端设备正在进行小数据传输，且该终端设备支持在RRC非激活态接收组播会话，则监听该寻呼消息。
一种可能的实现方法中，处理单元410，具体用于当终端设备正在进行小数据传输，该终端设备支持在RRC非激活态接收组播会话，且该终端设备驻留的小区支持为处于非激活态的终端设备提供组播会话，则监听该寻呼消息。
当通信装置400用于实现上述方法实施例中终端设备的功能，收发单元420，用于接收第一消息，该第一消息包括至少一个组播会话的标识信息，该终端设备处于RRC非激活态；处理单元410，用于当该至少一个组播会话中包含该终端设备加入的组播会话，且该终端设备处于小数据传输过程中，进入RRC空闲态并触发RRC连接建立流程；其中，该小数据传输为该终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
一种可能的实现方法中，第一消息是RRC消息或寻呼消息。
当通信装置400用于实现上述方法实施例中第一无线接入网设备的功能，处理单元410，用于控制收发单元420发送第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活；接收来自第一终端设备的指示信息，所述指示信息包括指示非小数据传输数据指示，和/ 或组播原因值；其中，所述至少一个组播会话中包括所述第一终端设备加入的组播会话，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备。
一种可能的实现方法中，处理单元410，还用于控制收发单元420接收来自第一终端设备的指示信息之后，向所述第一终端设备发送RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
一种可能的实现方法中，处理单元410，还用于控制收发单元420向所述第一终端设备发送RRC恢复消息之前，向所述第一终端设备发送RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；所述第一无线接入网设备接收来自所述第一终端设备的RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，接收来自所述第一终端设备的RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
一种可能的实现方法中，所述第二寻呼消息还用于指示处于RRC连接态的终端设备接收所述至少一个组播会话；或者，所述第二寻呼消息还用于指示所述至少一个组播会话为处于RRC连接态或RRC非连接态终端设备接收的组播会话。
一种可能的实现方法中，处理单元410，还用于控制收发单元420发送第二寻呼消息之前，接收第一寻呼消息，所述第一寻呼消息用于通知一个或多个组播会话激活；以及根据所述第一寻呼消息，确定所述第二寻呼消息。
一种可能的实现方法中，处理单元410，用于控制收发单元420接收第一寻呼消息，具体包括：用于接收来自第二无线接入网设备或核心网设备的所述第一寻呼消息，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，所述第一寻呼消息中还包括用于寻呼终端设备的信息；处理单元410，还用于控制收发单元420发送第二寻呼消息，具体包括：用于根据所述用于寻呼终端设备的信息，发送所述第二寻呼消息。
一种可能的实现方法中，所述组播原因值指示所述至少一个组播会话中包含所述第一终端设备加入的组播会话，或者指示所述第一终端设备加入的组播会话激活，或者指示所述第一终端设备进入RRC连接态接收组播。
一种可能的实现方法中，处理单元410，还用于控制收发单元420接收来自第一终端设备的指示信息之后，向第二无线接入网设备发送上下文请求消息，所述上下文请求消息用于请求所述第一终端设备的终端设备上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备；接收来自所述第二无线接入网设备的所述第一终端设备的终端设备上下文。
当通信装置400用于实现上述方法实施例中第一无线接入网设备的功能，收发单元420，用于接收第一寻呼消息，所述第一寻呼消息中包括一个或多个组播会话的标识，所述第一寻呼消息用于通知所述一个或多个组播会话激活，所述第一无线接入网设备是第一终端设备服务无线接入网设备；其中，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；处理单元410，用于获取所述第一终端设备的组播相关的上下文，所述组播相关的上下文中包括所述第一终端设备加入的组播会话的标识；收发单元420，还用于向所述第一终端设备发送RRC恢复消息，所述一个或多个组播会话的标识中包括所述第一终端设备加入的组播会话的标识，所述RRC恢复消息用于恢复所述第一终端设备 的RRC连接。
一种可能的实现方法中，处理单元410，还用于在收发单元420向所述第一终端设备发送RRC恢复消息之前，根据所述第一寻呼消息，确定第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活，所述至少一个组播会话包括所述第一终端设备加入的组播会话；收发单元420，还用于发送所述第二寻呼消息。
一种可能的实现方法中，收发单元420，还用于向所述第一终端设备发送RRC恢复消息之前，向所述第一终端设备发送RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；接收来自所述第一终端设备的RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，接收来自所述第一终端设备的RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
一种可能的实现方法中，收发单元420，用于接收第一寻呼消息，具体包括：用于接收来自第二无线接入网设备或核心网设备的所述第一寻呼消息，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，处理单元410，用于获取所述第一终端设备的组播相关的上下文，具体包括：用于通过收发单元420向第二无线接入网设备发送第一上下文请求消息，所述第一上下文请求消息用于请求获取所述第一终端设备的上下文进行小数据传输；接收来自所述第二无线接入网设备的所述第一终端设备的部分上下文，所述第一终端设备的部分上下文包括小数据传输相关的上下文和所述组播相关的上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，收发单元420，还用于向所述第二无线接入网设备发送第二上下文请求消息，所述第二上下文请求消息用于请求获取所述第一终端设备的上下文；接收来自所述第二无线接入网设备的所述第一终端设备的终端设备上下文。
一种可能的实现方法中，处理单元410，用于获取第一终端设备的组播相关的上下文，具体包括：用于通过收发单元420接收来自第二无线接入网设备的所述第一终端设备的终端设备上下文，所述终端设备上下文中包括所述组播相关的上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
当通信装置400用于实现上述方法实施例中第二无线接入网设备的功能，处理单元410，用于判断激活的一个或多个组播会话的标识中是否包括第一终端设备加入的组播会话的标识；收发单元420，用于当激活的所述一个或多个组播会话的标识中包括所述第一终端设备加入的组播会话的标识，向第一无线接入网设备发送所述第一终端设备的终端设备上下文；其中，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
一种可能的实现方法中，所述终端设备上下文中包括所述第一终端设备的组播相关的上下文。
一种可能的实现方法中，收发单元420，还用于在向第一无线接入网设备发送所述第一终端设备的终端设备上下文之前，接收来自所述第一无线接入网设备的上下文请求消息，所述上下文请求消息用于请求获取所述终端设备的上下文进行小数据传输；向所述第一无线接入网设备发送所述第一终端设备的部分上下文，所述第一终端设备的部分上下文包括小数据传输相关的上下文。
一种可能的实现方法中，所述方法还包括：所述第二无线接入网设备向所述第一无线接入网设备发送第一寻呼消息，所述第一寻呼消息用于通知所述一个或多个组播会话激活。
一种可能的实现方法中，所述第一寻呼消息包括所述一个或多个组播会话的标识。
当通信装置400用于实现上述方法实施例中第一终端设备的功能，处理单元410，用于控制收发单元420接收来自第一无线接入网设备的第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活；向第一无线接入网设备发送指示信息，所述指示信息包括指示非小数据传输数据指示，和/或组播原因值；其中，所述至少一个组播会话中包括所述第一终端设备加入的组播会话，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备。
一种可能的实现方法中，处理单元410，还用于控制收发单元420向第一无线接入网设备发送指示信息之后，接收来自所述第一无线接入网设备的RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
一种可能的实现方法中，处理单元410，还用于控制收发单元420接收来自所述第一无线接入网设备的RRC恢复消息之前，接收来自所述第一无线接入网设备的RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；向所述第一无线接入网设备发送RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，向所述第一无线接入网设备发送RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
一种可能的实现方法中，所述第二寻呼消息还用于指示处于RRC连接态的终端设备接收所述至少一个组播会话；或者，所述第二寻呼消息还用于指示所述至少一个组播会话为处于RRC连接态或RRC非连接态终端设备接收的组播会话。
一种可能的实现方法中，所述组播原因值指示所述至少一个组播会话中包含所述第一终端设备加入的组播会话，或者指示所述第一终端设备加入的组播会话激活，或者指示所述第一终端设备进入RRC连接态接收组播。
有关上述处理单元410和收发单元420更详细的描述，可以直接参考上述方法实施例中相关描述直接得到，这里不加赘述。
如图5所示，通信装置500包括处理器510和接口电路520。处理器510和接口电路520之间相互耦合。可以理解的是，接口电路520可以为收发器或输入输出接口。可选的，通信装置500还可以包括存储器530，用于存储处理器510执行的指令或存储处理器510运行指令所需要的输入数据或存储处理器510运行指令后产生的数据。
当通信装置500用于实现上述方法实施例时，处理器510用于实现上述处理单元410的功能，接口电路520用于实现上述收发单元420的功能。
当上述通信装置为应用于终端设备的芯片时，该终端设备芯片实现上述方法实施例中终端设备的功能。该终端设备芯片从终端设备中的其它模块(如射频模块或天线)接收信息，该信息是无线接入网设备发送给终端设备的；或者，该终端设备芯片向终端设备中的其它模块(如射频模块或天线)发送信息，该信息是终端设备发送给无线接入网设备的。
可以理解的是，本申请的实施例中的处理器可以是中央处理单元(Central Processing Unit，CPU)，还可以是其它通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其它可编程逻辑器件、晶体管逻辑器件，硬件部件 或者其任意组合。通用处理器可以是微处理器，也可以是任何常规的处理器。
本申请的实施例中的方法步骤可以通过硬件的方式来实现，也可以由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器、闪存、只读存储器、可编程只读存储器、可擦除可编程只读存储器、电可擦除可编程只读存储器、寄存器、硬盘、移动硬盘、致密光盘只读存储器(compact disc read-only memory，CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于无线接入网设备或终端设备中。当然，处理器和存储介质也可以作为分立组件存在于无线接入网设备或终端设备中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序或指令。计算机程序(英语：Computer Program)是指一组指示电子计算机或其他具有消息处理能力设备每一步动作的指令，通常用某种程序设计语言编写，运行于某种目标体系结构上。在计算机上加载和执行所述计算机程序或指令时，全部或部分地执行本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、无线接入网设备、终端设备或者其它可编程装置。所述计算机程序或指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机程序或指令可以从一个网站站点、计算机、服务器或数据中心通过有线或无线方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是集成一个或多个可用介质的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，例如，软盘、硬盘、磁带；也可以是光介质，例如，数字视频光盘；还可以是半导体介质，例如，固态硬盘。该计算机可读存储介质可以是易失性或非易失性存储介质，或可包括易失性和非易失性两种类型的存储介质。
在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A，B可以是单数或者复数。在本申请的文字描述中，字符“/”，一般表示前后关联对象是一种“或”的关系；在本申请的公式中，字符“/”，表示前后关联对象是一种“相除”的关系。
可以理解的是，在本申请的实施例中涉及的各种数字编号仅为描述方便进行的区分，并不用来限制本申请的实施例的范围。上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定。

Claims (54)

  1. 一种无线通信方法，其特征在于，包括：
    第一终端设备接收寻呼消息，所述寻呼消息包括至少一个组播会话的标识信息，所述第一终端设备处于无线资源控制RRC非激活态；
    当满足第一条件，所述第一终端设备触发RRC连接恢复流程；
    其中，所述第一条件包括：所述至少一个组播会话中包含所述第一终端设备加入的组播会话，且所述第一终端设备不处于小数据传输过程中；或者，
    所述第一条件包括：所述寻呼消息还包括至少一个终端设备的标识信息，所述至少一个组播会话中包含所述第一终端设备加入的组播会话，所述终端设备不处于小数据传输过程中，且所述至少一个终端设备的标识信息不包括所述第一终端设备的标识信息；
    所述小数据传输为所述第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
  2. 如权利要求1所述的方法，其特征在于，所述第一终端设备触发RRC连接恢复流程，包括：
    所述第一终端设备向无线接入网设备发送RRC恢复请求消息。
  3. 如权利要求1或2所述的方法，其特征在于，所述方法还包括：
    当满足第二条件，所述第一终端设备确定不触发RRC连接恢复流程；
    其中，所述第二条件包括：所述至少一个组播会话中包含所述第一终端设备加入的组播会话，且所述第一终端设备处于小数据传输过程中。
  4. 如权利要求1至3中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备向无线接入网设备发送指示信息，所述指示信息指示非小数据传输的无线承载上有数据和/或信令到达，或者所述至少一个组播会话中包含所述第一终端设备加入的组播会话。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    当满足第三条件，所述第一终端设备进入RRC空闲态并触发RRC连接建立流程；
    其中，所述第三条件包括：所述寻呼消息还包括至少一个终端设备的标识信息，所述至少一个组播会话中包含所述第一终端设备加入的组播会话，所述终端设备不处于小数据传输过程中，且所述至少一个终端设备的标识信息包括所述第一终端设备的标识信息。
  6. 一种无线通信方法，其特征在于，包括：
    终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，所述终端设备处于无线资源控制RRC非激活态，所述寻呼消息包含至少一个组播会话的标识信息；
    其中，所述终端设备加入了一个或多个组播会话，所述小数据传输为所述第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
  7. 如权利要求6所述的方法，其特征在于，所述终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，包括：
    当所述终端设备未在进行小数据传输，则所述终端设备监听所述寻呼消息。
  8. 如权利要求6所述的方法，其特征在于，所述终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，包括：
    当所述终端设备正在进行小数据传输，则所述终端设备不监听所述寻呼消息。
  9. 如权利要求8所述的方法，其特征在于，所述当所述终端设备正在进行小数据传输，则所述终端设备不监听所述寻呼消息，包括：
    当所述终端设备正在进行小数据传输，且所述终端设备不支持在RRC非激活态接收组播会话，则所述终端设备不监听所述寻呼消息。
  10. 如权利要求8或9所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收RRC消息，所述RRC消息包括所述至少一个组播会话的标识信息，所述RRC消息用于指示所述至少一个组播会话已经被激活；
    当所述至少一个组播会话中包含所述终端设备加入的组播会话，所述终端设备在RRC非激活态下接收所述终端设备加入的组播会话。
  11. 如权利要求6所述的方法，其特征在于，所述终端设备根据小数据传输的状态，判断是否监听用于组通知的寻呼消息，包括：
    当所述终端设备正在进行小数据传输，且所述终端设备支持在RRC非激活态接收组播会话，则所述终端设备监听所述寻呼消息。
  12. 如权利要求11所述的方法，其特征在于，所述终端设备正在进行小数据传输，且所述终端设备支持在RRC非激活态接收组播会话，则所述终端设备监听所述寻呼消息，包括：
    当所述终端设备正在进行小数据传输，所述终端设备支持在RRC非激活态接收组播会话，且所述终端设备驻留的小区支持为处于非激活态的终端设备提供组播会话，则所述终端设备监听所述寻呼消息。
  13. 一种无线通信方法，其特征在于，包括：
    终端设备接收第一消息，所述第一消息包括至少一个组播会话的标识信息，所述终端设备处于无线资源控制RRC非激活态；
    当所述至少一个组播会话中包含所述终端设备加入的组播会话，且所述终端设备处于小数据传输过程中，所述终端设备进入RRC空闲态并触发RRC连接建立流程；
    其中，所述小数据传输为所述终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
  14. 如权利要求13所述的方法，其特征在于，所述第一消息是RRC消息或寻呼消息。
  15. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1至5中任一项所述的方法，或用于实现如权利要求6至12中任一项所述的方法，或用于实现如权利要求13或14所述的方法。
  16. 一种通信系统，其特征在于，包括第一终端设备和无线接入网设备；
    所述第一终端设备，用于寻呼消息，所述寻呼消息包括至少一个组播会话的标识信息，所述第一终端设备处于无线资源控制RRC非激活态；当满足第一条件，触发RRC连接恢复流程；
    所述无线接入网设备，用于向所述第一终端设备发送RRC恢复消息，所述RRC恢复消息用于触发所述第一终端设备进入RRC连接态；
    其中，所述第一条件包括：所述至少一个组播会话中包含所述第一终端设备加入的组播会话，且所述第一终端设备不处于小数据传输过程中；或者，
    所述第一条件包括：所述寻呼消息还包括至少一个终端设备的标识信息，所述至少一个组播会话中包含所述第一终端设备加入的组播会话，所述终端设备不处于小数据传输过程中，且所述至少一个终端设备的标识信息不包括所述第一终端设备的标识信息；
    所述小数据传输为所述第一终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
  17. 如权利要求16所述的系统，其特征在于，所述第一终端设备，具体用于向无线接入网设备发送RRC恢复请求消息。
  18. 如权利要求16或17所述的系统，其特征在于，所述第一终端设备，还用于当满足第二条件，确定不触发RRC连接恢复流程；
    其中，所述第二条件包括：所述至少一个组播会话中包含所述第一终端设备加入的组播会话，且所述第一终端设备处于小数据传输过程中。
  19. 如权利要求16至18中任一项所述的系统，其特征在于，所述第一终端设备，还用于向无线接入网设备发送指示信息，所述指示信息指示非小数据传输的无线承载上有数据和/或信令到达，或者所述至少一个组播会话中包含所述第一终端设备加入的组播会话。
  20. 如权利要求16至19中任一项所述的系统，其特征在于，所述第一终端设备，还用于当满足第三条件，进入RRC空闲态并触发RRC连接建立流程；
    其中，所述第三条件包括：所述寻呼消息还包括至少一个终端设备的标识信息，所述至少一个组播会话中包含所述第一终端设备加入的组播会话，所述终端设备不处于小数据传输过程中，且所述至少一个终端设备的标识信息包括所述第一终端设备的标识信息。
  21. 一种通信系统，其特征在于，包括终端设备和无线接入网设备；
    所述无线接入网设备，用于向所述终端设备发送第一消息，所述第一消息包括至少一个组播会话的标识信息，所述终端设备处于无线资源控制RRC非激活态；
    所述终端设备，用于当所述至少一个组播会话中包含所述终端设备加入的组播会话，且所述终端设备处于小数据传输过程中，进入RRC空闲态并触发RRC连接建立流程；
    其中，所述小数据传输为所述终端设备在RRC非激活态进行的数据量低于预设阈值的数据和/或信令的传输。
  22. 如权利要求21所述的系统，其特征在于，所述第一消息是RRC消息或寻呼消息。
  23. 一种无线通信方法，其特征在于，包括：
    第一无线接入网设备发送第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活；
    所述第一无线接入网设备接收来自第一终端设备的指示信息，所述指示信息包括指示非小数据传输数据指示，和/或组播原因值；其中，所述至少一个组播会话中包括所述第一终端设备加入的组播会话，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备。
  24. 如权利要求23所述的方法，其特征在于，所述第一无线接入网设备接收来自第一终端设备的指示信息之后，还包括：
    所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
  25. 如权利要求24所述的方法，其特征在于，所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息之前，还包括：
    所述第一无线接入网设备向所述第一终端设备发送RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；
    所述第一无线接入网设备接收来自所述第一终端设备的RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，所述第一无线接入网设备接收来自所述第一终端设备的RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
  26. 如权利要求23至25中任一项所述的方法，其特征在于，所述第二寻呼消息还用于指示处于RRC连接态的终端设备接收所述至少一个组播会话；或者，
    所述第二寻呼消息还用于指示所述至少一个组播会话为处于RRC连接态或RRC非连接态终端设备接收的组播会话。
  27. 如权利要求23至26中任一项所述的方法，其特征在于，所述第一无线接入网设备发送第二寻呼消息之前，还包括：
    所述第一无线接入网设备接收第一寻呼消息，所述第一寻呼消息用于通知一个或多个组播会话激活；
    根据所述第一寻呼消息，确定所述第二寻呼消息。
  28. 如权利要求27所述的方法，其特征在于，所述第一无线接入网设备接收第一寻呼消息，包括：
    所述第一无线接入网设备接收来自第二无线接入网设备或核心网设备的所述第一寻呼消息，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
  29. 如权利要求27或28所述的方法，其特征在于，所述第一寻呼消息中还包括用于寻呼终端设备的信息；
    所述第一无线接入网设备发送第二寻呼消息，包括：
    所述第一无线接入网设备根据所述用于寻呼终端设备的信息，发送所述第二寻呼消息。
  30. 如权利要求23至29中任一项所述的方法，其特征在于，
    所述组播原因值指示所述至少一个组播会话中包含所述第一终端设备加入的组播会话，或者指示所述第一终端设备加入的组播会话激活，或者指示所述第一终端设备进入RRC连接态接收组播。
  31. 如权利要求23至30中任一项所述的方法，其特征在于，所述第一无线接入网设备接收来自第一终端设备的指示信息之后，还包括：
    所述第一无线接入网设备向第二无线接入网设备发送上下文请求消息，所述上下文请求消息用于请求所述第一终端设备的终端设备上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备；
    所述第一无线接入网设备接收来自所述第二无线接入网设备的所述第一终端设备的终端设备上下文。
  32. 一种无线通信方法，其特征在于，包括：
    第一无线接入网设备接收第一寻呼消息，所述第一寻呼消息中包括一个或多个组播会话的标识，所述第一寻呼消息用于通知所述一个或多个组播会话激活，所述第一无线接入网设备是第一终端设备服务无线接入网设备；其中，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；
    所述第一无线接入网设备获取所述第一终端设备的组播相关的上下文，所述组播相关 的上下文中包括所述第一终端设备加入的组播会话的标识；
    所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接，所述一个或多个组播会话的标识中包括所述第一终端设备加入的组播会话的标识。
  33. 如权利要求32所述的方法，其特征在于，所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息之前，还包括：
    根据所述第一寻呼消息，确定第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活，所述至少一个组播会话包括所述第一终端设备加入的组播会话；
    发送所述第二寻呼消息。
  34. 如权利要求32或33所述的方法，其特征在于，所述第一无线接入网设备向所述第一终端设备发送RRC恢复消息之前，还包括：
    所述第一无线接入网设备向所述第一终端设备发送RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；
    所述第一无线接入网设备接收来自所述第一终端设备的RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，所述第一无线接入网设备接收来自所述第一终端设备的RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
  35. 如权利要求32至34中任一项所述的方法，其特征在于，所述第一无线接入网设备接收第一寻呼消息，包括：
    所述第一无线接入网设备接收来自第二无线接入网设备或核心网设备的所述第一寻呼消息，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
  36. 如权利要求32至35中任一项所述的方法，其特征在于，所述第一无线接入网设备获取所述第一终端设备的组播相关的上下文，包括：
    所述第一无线接入网设备向第二无线接入网设备发送第一上下文请求消息，所述第一上下文请求消息用于请求获取所述第一终端设备的上下文进行小数据传输；
    所述第一无线接入网设备接收来自所述第二无线接入网设备的所述第一终端设备的部分上下文，所述第一终端设备的部分上下文包括小数据传输相关的上下文和所述组播相关的上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
  37. 如权利要求36所述的方法，其特征在于，所述方法还包括：
    所述第一无线接入网设备向所述第二无线接入网设备发送第二上下文请求消息，所述第二上下文请求消息用于请求获取所述第一终端设备的上下文；
    所述第一无线接入网设备接收来自所述第二无线接入网设备的所述第一终端设备的终端设备上下文。
  38. 如权利要求32至35中任一项所述的方法，其特征在于，所述第一无线接入网设备获取第一终端设备的组播相关的上下文，包括：
    所述第一无线接入网设备接收来自第二无线接入网设备的所述第一终端设备的终端设备上下文，所述终端设备上下文中包括所述组播相关的上下文，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
  39. 一种无线通信方法，其特征在于，包括：
    第二无线接入网设备判断激活的一个或多个组播会话的标识中是否包括第一终端设备加入的组播会话的标识；
    当激活的所述一个或多个组播会话的标识中包括所述第一终端设备加入的组播会话的标识，所述第二无线接入网设备向第一无线接入网设备发送所述第一终端设备的终端设备上下文；
    其中，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备，所述第二无线接入网设备是所述第一终端设备在RRC连接态的最后服务无线接入网设备。
  40. 如权利要求39所述的方法，其特征在于，所述终端设备上下文中包括所述第一终端设备的组播相关的上下文。
  41. 如权利要求39或40所述的方法，其特征在于，所述第二无线接入网设备向第一无线接入网设备发送所述第一终端设备的终端设备上下文之前，还包括：
    所述第二无线接入网设备接收来自所述第一无线接入网设备的上下文请求消息，所述上下文请求消息用于请求获取所述终端设备的上下文进行小数据传输；
    所述第二无线接入网设备向所述第一无线接入网设备发送所述第一终端设备的部分上下文，所述第一终端设备的部分上下文包括小数据传输相关的上下文。
  42. 如权利要求39至41中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二无线接入网设备向所述第一无线接入网设备发送第一寻呼消息，所述第一寻呼消息用于通知所述一个或多个组播会话激活。
  43. 如权利要求42所述的方法，其特征在于，所述第一寻呼消息包括所述一个或多个组播会话的标识。
  44. 一种无线通信方法，其特征在于，包括：
    第一终端设备接收来自第一无线接入网设备的第二寻呼消息，所述第二寻呼消息指示至少一个组播会话激活；
    所述第一终端设备向第一无线接入网设备发送指示信息，所述指示信息包括指示非小数据传输数据指示，和/或组播原因值；其中，所述至少一个组播会话中包括所述第一终端设备加入的组播会话，所述第一终端设备处于无线资源控制RRC非激活态且处于小数据传输过程；所述第一无线接入网设备是所述第一终端设备的服务无线接入网设备。
  45. 如权利要求44所述的方法，其特征在于，所述第一终端设备向第一无线接入网设备发送指示信息之后，还包括：
    所述第一终端设备接收来自所述第一无线接入网设备的RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
  46. 如权利要求45所述的方法，其特征在于，所述第一终端设备接收来自所述第一无线接入网设备的RRC恢复消息之前，还包括：
    所述第一终端设备接收来自所述第一无线接入网设备的RRC释放消息，所述RRC释放消息用于指示所述第一终端设备进入RRC非激活态或RRC空闲态；
    所述第一终端设备向所述第一无线接入网设备发送RRC恢复请求消息，所述RRC恢复请求消息用于请求进入RRC连接态；或者，所述第一终端设备向所述第一无线接入网设备发送RRC建立请求消息，所述RRC建立请求消息用于请求建立RRC连接。
  47. 如权利要求44至46中任一项所述的方法，其特征在于，所述第二寻呼消息还用于 指示处于RRC连接态的终端设备接收所述至少一个组播会话；或者，
    所述第二寻呼消息还用于指示所述至少一个组播会话为处于RRC连接态或RRC非连接态终端设备接收的组播会话。
  48. 如权利要求44至47中任一项所述的方法，其特征在于，
    所述组播原因值指示所述至少一个组播会话中包含所述第一终端设备加入的组播会话，或者指示所述第一终端设备加入的组播会话激活，或者指示所述第一终端设备进入RRC连接态接收组播。
  49. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求23至31中任一项所述的方法，或用于实现如权利要求32至38中任一项所述的方法，或用于实现如权利要求39至43中任一项所述的方法，或用于实现如权利要求44至48中任一项所述的方法。
  50. 一种通信系统，其特征在于，包括用于实现如权利要求23至31中任一项所述方法的第一无线接入网设备，和用于实现如权利要求44至48中任一项所述方法的第一终端设备。
  51. 一种通信系统，其特征在于，包括第一终端设备，和用于实现如权利要求32至38中任一项所述方法的第一无线接入网设备；
    所述第一终端设备，用于接收RRC恢复消息，所述RRC恢复消息用于恢复所述第一终端设备的RRC连接。
  52. 一种通信系统，其特征在于，包括第一无线接入网设备，和用于实现如权利要求39至43中任一项所述方法的第二无线接入网设备；
    所述第一无线接入网设备，用于接收第一终端设备的终端设备上下文。
  53. 一种计算机程序产品，其特征在于，包括计算机程序，当所述计算机程序被通信装置执行时，实现如权利要求1至5中任一项所述的方法，或用于实现如权利要求6至12中任一项所述的方法，或用于实现如权利要求13或14所述的方法，或用于实现如权利要求23至31中任一项所述的方法，或用于实现如权利要求32至38中任一项所述的方法，或用于实现如权利要求39至43中任一项所述的方法，或用于实现如权利要求44至48中任一项所述的方法。
  54. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序或指令，当所述计算机程序或指令被通信装置执行时，实现如权利要求1至5中任一项所述的方法，或用于实现如权利要求6至12中任一项所述的方法，或用于实现如权利要求13或14所述的方法，或用于实现如权利要求23至31中任一项所述的方法，或用于实现如权利要求32至38中任一项所述的方法，或用于实现如权利要求39至43中任一项所述的方法，或用于实现如权利要求44至48中任一项所述的方法。
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