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WO2021062767A1 - 基于非竞争的两步随机接入方法、装置、终端及存储介质 - Google Patents

基于非竞争的两步随机接入方法、装置、终端及存储介质 Download PDF

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Publication number
WO2021062767A1
WO2021062767A1 PCT/CN2019/109690 CN2019109690W WO2021062767A1 WO 2021062767 A1 WO2021062767 A1 WO 2021062767A1 CN 2019109690 W CN2019109690 W CN 2019109690W WO 2021062767 A1 WO2021062767 A1 WO 2021062767A1
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WIPO (PCT)
Prior art keywords
message
pdcch
random access
grant
rnti
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PCT/CN2019/109690
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English (en)
French (fr)
Inventor
石聪
Original Assignee
Oppo广东移动通信有限公司
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 Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2019/109690 priority Critical patent/WO2021062767A1/zh
Priority to CN201980095149.3A priority patent/CN113875311B/zh
Publication of WO2021062767A1 publication Critical patent/WO2021062767A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA

Definitions

  • the transceiver is configured to monitor the message B in the listening window of the message B;
  • the base station When the base station fails to receive the load of message A in the non-contention-based two-step random access process, it sends message B for scheduling uplink resources to the UE to retransmit the load. After receiving the message B, the UE sends the message B according to the message B’s instructions and scheduling retransmit the load to the base station, thereby realizing the retransmission scheduling of the load in message A to complete the two-step random access process based on non-competition, and improve the access of the two-step random process based on non-competition. Entry success rate.
  • Fig. 1 is a block diagram of a communication system provided by an exemplary embodiment of the present application
  • Fig. 2 is a flowchart of a two-step random access method based on non-competition provided by an exemplary embodiment of the present application;
  • Fig. 3 is a flowchart of a two-step random access method based on non-competition provided by another exemplary embodiment of the present application;
  • FIG. 4 is a flowchart of a two-step random access method based on non-competition provided by another exemplary embodiment of the present application;
  • Fig. 5 is a flowchart of a two-step random access method based on non-competition provided by another exemplary embodiment of the present application;
  • Fig. 6 is a block diagram of a two-step random access device based on non-competition provided by an exemplary embodiment of the present application;
  • Fig. 7 is a block diagram of a two-step random access device based on non-competition provided by another exemplary embodiment of the present application.
  • FIG. 8 is a block diagram of a two-step random access device based on non-competition provided by another exemplary embodiment of the present application.
  • FIG. 9 is a block diagram of a two-step random access device based on non-competition provided by another exemplary embodiment of the present application.
  • Fig. 10 is a block diagram of a communication device provided by an exemplary embodiment of the present application.
  • the number of terminals 20 is usually multiple, and one or more terminals 20 may be distributed in a cell managed by each access network device 11.
  • the terminal 20 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of UE, MS (Mobile Station, mobile station), etc. .
  • the devices mentioned above are collectively referred to as terminals.
  • the access network device 11 and the terminal 20 communicate with each other through a certain aerial technology, such as a Uu interface.
  • the terminal 20 may access the cell by connecting to the access network device 11 of the cell, and the terminal 20 and the access network device 11
  • the process of connecting is called a random access process.
  • cell A and cell B are different cells
  • the terminal 20 enters cell B from cell A, it needs to switch the connection with the access network device 11 of cell A to the access network device 11 of cell B
  • the process in which the terminal 20 switches between different access network devices 11 is called a non-contention-based random access process.
  • the non-competition-based random access process includes a non-competition-based four-step random access process and a non-competition-based two-step random access process.
  • the technical solution of the embodiment of the present application can be applied to a non-competition-based two-step random access process. During the access process, it can also be applied to other non-competition-based random access processes in subsequent evolution, which is not limited in the embodiment of the present application.
  • the UE sends a message 1 including a random access preamble to the base station.
  • the base station After receiving the message 1, the base station sends a message 2 including a random access response to the UE, and the UE receives After message 2, message 3 including identity information (or other payload) is sent to the base station.
  • message 3 including identity information (or other payload) is sent to the base station.
  • the base station After receiving message 3, the base station sends message 4 including an access resolution message to the UE.
  • the message 1 and message 3 sent by the UE to the base station are combined into message A, and the message 2 and message 2 sent by the base station to the UE Message 4 is merged into message B described below.
  • the following exemplary embodiments of the present application only take the non-contention-based random access method as the non-contention-based two-step random access method and the application of the UE to access the base station as an example for illustration.
  • personnel will easily think of using the non-competition-based random access method provided by this application as other non-competition-based random access methods for subsequent evolution, and applying it to other terminals to access other access methods.
  • networked equipment such as MS accessing base stations, etc.
  • these extension schemes should be included in the protection scope of this application.
  • FIG. 2 shows a flowchart of a two-step random access method based on non-contention provided by an exemplary embodiment of the present application.
  • This method can be applied to the system architecture shown in Figure 1.
  • the method can include the following steps (201 ⁇ 208):
  • Step 201 the UE sends a message A.
  • message A is mainly configured in the handover (HandOver, HO) command message.
  • the handover command is used to control the UE to perform cell handover, that is, the UE and the cell
  • the connection between the base stations of A is switched to the connection between the UE and the base stations of cell B.
  • Message A includes: random access preamble and payload.
  • the random access preamble is a dedicated random access preamble configured by the network for the UE.
  • the payload is transmitted on the dedicated uplink shared data channel PUSCH configured by the base station for the UE. It mainly includes the handover command completion message and possible user plane data.
  • the UE After the MAC layer generates the MAC PDU corresponding to the payload of message A, the UE stores the MAC PDU (Media Access Control Protocol Data Unit, the protocol data unit of the media access control layer) in a fixed HARQ (Hybrid Auto Repeat Request, hybrid). Automatic retransmission request) buffer (buffer), such as message A buffer (or message 3 buffer).
  • the HARQ process ID that transmits the MAC PDU is a fixed HARQ process ID, such as HARQ process ID 0.
  • Step 202 The base station receives message A.
  • step 203 the base station judges whether the load transmitted in the PUSCH of the message A is successfully received; if so, step 204 is executed; if not, step 207 is executed.
  • Step 204 When the base station fails to successfully receive the load, it sends a message B for retransmitting the load.
  • the base station After receiving message A, the base station decodes or decodes message A.
  • the base station sends message B to the UE to schedule the retransmission of the load.
  • Message B is the response of the base station to message A, and message B is used to directly or indirectly schedule uplink resources for retransmission of the load, so as to achieve the purpose of retransmission of the load.
  • message A includes the UE-specific random access preamble
  • the base station can Identify the UE according to message A, and obtain the C-RNTI of the UE. Therefore, regardless of whether the base station can decode the load transmitted in the PUSCH, the base station can send a message B to the UE.
  • the message B includes a random access response and a random access method.
  • Step 205 The terminal monitors the message B in the listening window of the message B.
  • the UE after the UE finishes sending message A, it will start a message B listening window.
  • the UE can blindly check the PDCCH (Physical Downlink Control Channel), where: PDCCH is scrambled through RNTI (Radio Network Temporary Identifier), that is, PDCCH is addressed through RNTI.
  • PDCCH Physical Downlink Control Channel
  • RNTI Radio Network Temporary Identifier
  • step 204 can be implemented after step 201, after step 202, or after step 203.
  • the drawing of step 204 after step 201 in FIG. 2 is only an exemplary description. The application is not limited.
  • Step 206 The terminal retransmits the payload.
  • the terminal After receiving the message B sent by the base station, the terminal can retransmit the load according to the uplink resources directly or indirectly scheduled by the message B to complete the non-contention-based two-step random access process, that is, the UE completes the cell handover.
  • Step 207 When the base station successfully receives the load, it sends a message B for indicating permission to access the base station.
  • the message B used to indicate permission to access the base station does not carry the UL grant.
  • Step 208 The terminal receives message B.
  • the technical solution provided by the embodiments of the present application when the base station fails to successfully receive the load of the message A in the non-contention-based two-step random access process, it sends the uplink resource for scheduling to the UE to achieve load control. Retransmitted message B. After receiving the message B, the UE retransmits the load to the base station according to the instructions and scheduling of the message B, thereby realizing the retransmission scheduling of the load in the message A to complete the two-step random access based on non-contention The process improves the access success rate of a two-step random process based on non-competition.
  • the DCI in message B is scrambled by C-RNTI, and the DCI schedules downlink transmission;
  • the DCI in message B is scrambled by MsgB-RNTI (such as RA-RNTI), and the DCI schedules downlink transmission.
  • MsgB-RNTI such as RA-RNTI
  • the DCI in message B is scrambled by C-RNTI, and the DCI schedules uplink transmission.
  • the above-mentioned method may include the following steps:
  • Step 201 the UE sends a message A.
  • Message A includes: random access preamble and payload, where the random access preamble is a dedicated random access preamble configured by the network for the UE, and the payload is transmitted on the dedicated uplink shared data channel PUSCH configured by the network for the UE. It mainly includes the handover command completion message and possible user plane data.
  • the UE After the MAC layer generates the MAC PDU corresponding to the message A payload, the UE saves the MAC PDU in a MAC PDU in a fixed HARQ buffer, such as the message A buffer (or the message 3 buffer).
  • the HARQ process ID that transmits the MAC PDU is a fixed HARQ process ID, such as HARQ process ID 0.
  • Step 202 The base station receives message A.
  • step 203 the base station judges whether the load transmitted in the PUSCH of the message A is successfully received; if so, step 204 is executed; if not, step 207 is executed.
  • Step 2041 The base station determines the C-RNTI of the UE according to the UE-specific random access preamble.
  • the base station can determine the C-RNTI of the UE according to the UE-specific random access preamble.
  • the C-RNTI can be used to address the PDCCH, that is, it can be scrambled. PDCCH.
  • Step 2042 The base station sends a message B, where the message B is a PDCCH scrambled by C-RNTI.
  • the PDCCH includes DCI (Downlink Control Information, downlink control command), which is used to schedule downlink transmission.
  • DCI is the downlink control information sent by the base station to the UE.
  • the DCI can be used to schedule uplink transmission or Can be used to schedule downlink transmission.
  • the base station When DCI is used for scheduling downlink transmission, the base station sends downlink information to the UE on the downlink resources scheduled by the DCI; when the DCI is used for scheduling uplink transmission, the UE sends uplink information to the base station on the uplink resources scheduled by the DCI.
  • Step 2051 the UE monitors the message B in the listening window of the message B;
  • the UE receives message B, obtains DCI according to the PDCCH in message B, and receives downlink data according to DCI scheduling.
  • the UE will start a listening window after sending message A. In this listening window, the UE can blindly detect the PDCCH.
  • the PDCCH is scrambled by C-RNTI, and the DCI contained in the PDCCH contains DA (Downlink Assignment, downlink assignment), the DA is scheduled for PDSCH (Physical Downlink Shared Channel, physical downlink shared channel).
  • DA Downlink Assignment, downlink assignment
  • PDSCH Physical Downlink Shared Channel, physical downlink shared channel
  • Step 2043 The base station sends a MAC PDU on the downlink resource scheduled by the PDCCH.
  • the base station sends the MAC PDU on the downlink resources scheduled by the DCI in the PDCCH.
  • Step 2052 The UE receives and decodes the MAC PDU.
  • the MAC PDU may include TAC (Timing Alignment Command), or TAC and UL grant (Up Link grant, uplink scheduling resource). ), can also include fallback RAR (fallback RAR).
  • TAC Transmission Alignment Command
  • TAC and UL grant Up Link grant, uplink scheduling resource
  • fallback RAR fallback RAR
  • the TAC and UL grant can carry the same MAC CE (Media Access Control Control Element, Media Access Control Element) in the MAC PDU. It can also be carried in different MAC CEs in MAC PDU.
  • TAC is a timing alignment command used to align the time domain timing of the base station and the UE.
  • the UL grant is used to schedule uplink resources for retransmission of the load.
  • the MAC PDU includes TAC and UL grant, or the MAC PDU includes a fallback RAR, it indicates that the UE needs to retransmit the load.
  • Step 206 If the MAC PDU carries a UL grant, the UE retransmits the load on the uplink resource scheduled by the UL grant.
  • the UE After the UE decodes the MAC PDU, if the MAC PDU carries the UL grant, it indicates that the UE needs to retransmit the load to the base station, and the UE retransmits the load according to the uplink resource scheduled by the UL grant.
  • the MAC layer of the UE obtains the stored MAC PDU from the message A buffer (or the message 3 buffer) storing the payload, and transmits the MAC PDU in the UL grant.
  • Step 207 When the base station successfully receives the load, it sends a message B for indicating permission to access the base station.
  • the message B used to indicate permission to access the base station is also a PDCCH scrambled by using C-RNTI, and the DCI in the PDCCH is used to schedule downlink transmission.
  • the MAC PDU sent by the downlink transmission scheduled by the DCI includes TAC, but does not include UL grant or fallback RAR, it means that the base station has successfully received the load. At this time, the UE does not need to retransmit the load, and the UE clears it for transmission. After loading the HARQ buffer, the non-contention-based two-step random access process can be completed.
  • the technical solution provided by the embodiments of this application carries a PDCCH including DCI in message B.
  • the base station sends a MAC PDU on the downlink resources scheduled by the DCI, and the UE decodes the MAC PDU after receiving the MAC PDU. Determine whether to retransmit the load according to the content of the MAC PDU indicated by the decoding result, and provide a method to determine whether the load needs to be retransmitted. If the load needs to be retransmitted, the UE retransmits the load to the base station to achieve non-contention based The two-step random access process.
  • steps 2041 to 2043 can be implemented alternatively to the above method, which may include the following steps: As shown in Figure 4:
  • msgB-RNTI is the temporary wireless network identifier corresponding to message B.
  • the base station determines the msgB-RNTI of the UE according to the random access time-frequency resource position used by the UE to transmit the dedicated random access preamble, and the msgB-RNTI can scramble the PDCCH.
  • the base station determines the C-RNTI of the UE according to the UE-specific random access preamble, and the C-RNTI can scramble the PDCCH. That is, when the base station successfully receives the load, it uses the C-RNTI to scramble the PDCCH; when the base station fails to receive the load, it uses the msgB-RNTI to scramble the PDCCH.
  • the calculation method of msgB-RNTI is the same as the calculation method of RA-RNTI.
  • RA-RNTI is a temporary wireless network identification in a four-step random access mechanism based on non-competition.
  • the RA-RNTI is determined by the PRACH (Physical Random Access Channel) time-frequency resource location that carries message 1.
  • PRACH Physical Random Access Channel
  • the calculation formula of the msgB-RNTI is as follows:
  • the TAC and UL grant can carry the same MAC CE (Media Access Control Control Element, Media Access Control Element) in the MAC PDU. It can also be carried in different MAC CEs in MAC PDU.
  • TAC is a time alignment command used to align the time domain timing of the base station and the UE.
  • the MAC PDU includes TAC and UL grant, or the MAC PDU includes a fallback RAR, it indicates that the UE needs to retransmit the load.
  • Step 201 the UE sends a message A.
  • Message A includes: random access preamble and payload, where the random access preamble is a dedicated random access preamble configured by the network for the UE, and the payload is transmitted on the dedicated uplink shared data channel PUSCH configured by the network for the UE. It mainly includes the handover command completion message and possible user plane data.
  • the UE After the payload generates a MAC PDU at the MAC layer, the UE saves the MAC PDU in a MAC PDU in a fixed HARQ buffer, such as the message A buffer (or the message 3 buffer).
  • the HARQ process ID that transmits the MAC PDU is a fixed HARQ process ID, such as HARQ process ID 0.
  • step 203 the base station judges whether the load transmitted in the PUSCH of the message A is successfully received; if so, step 204 is executed; if not, step 207 is executed.
  • the UE will start a listening window after sending message A. In this listening window, the UE can blindly detect the PDCCH.
  • the PDCCH is scrambled by C-RNTI, and the DCI contained in the PDCCH includes UL grant.
  • the UE retransmits the load on the uplink resource scheduled by the UL grant.
  • Step 208 The terminal receives message B.
  • the technical solution of the present application is introduced and explained only from the perspective of the interaction between the base station and the UE.
  • the above steps performed by the base station can be separately implemented as a two-step random access method based on non-competition on the base station side, and the steps performed by the UE concerned can be separately implemented as a two-step random access method based on non-contention on the UE side.
  • FIG. 6 shows a block diagram of a non-contention-based two-step random access device provided by an exemplary embodiment of the present application.
  • the device 600 has the function of realizing the above-mentioned method embodiment on the UE side, and the function can be realized by hardware, or by hardware executing corresponding software.
  • the apparatus 600 may include: a sending module 610, a monitoring module 620, and a retransmission module 630.
  • the sending module 610 is configured to send a message A, the message A includes: a random access preamble and a payload, where the random access preamble is a UE-specific random access preamble, and the payload is on the UE-specific uplink shared channel PUSCH transmission.
  • the monitoring module 620 is configured to monitor the message B in the monitoring window of the message B.
  • the retransmission module 630 is configured to retransmit the load when the message B is used to schedule the retransmission of the load.
  • the device 600 further includes a receiving module 640: the receiving module 640 is configured to: when the message B is a downlink control channel PDCCH scrambled by the cell radio network temporary identifier C-RNTI, And when the PDCCH schedules downlink transmission, the protocol data unit MAC PDU of the media intervention control layer is received according to the downlink resource scheduled by the PDCCH; the retransmission module 630 is configured to carry the uplink scheduling authorization UL in the MAC PDU When granting, the load is retransmitted on the uplink resource scheduled by the UL grant.
  • the receiving module 640 is configured to: when the message B is a downlink control channel PDCCH scrambled by the cell radio network temporary identifier C-RNTI, And when the PDCCH schedules downlink transmission, the protocol data unit MAC PDU of the media intervention control layer is received according to the downlink resource scheduled by the PDCCH; the retransmission module 630 is configured to carry the uplink scheduling authorization UL in the MAC PDU When granting
  • the apparatus 600 further includes a receiving module 640: the receiving module 640 is configured to: when the message B is the downlink control channel PDCCH scrambled by the wireless network temporary identifier msgB-RNTI of the message B And when the PDCCH schedules downlink transmission, it receives the protocol data unit MAC PDU of the media intervention control layer according to the downlink resource scheduled by the PDCCH; the retransmission module 630 is configured to carry the uplink scheduling authorization in the MAC PDU When the UL grant, the load is retransmitted on the uplink resource scheduled by the UL grant.
  • the receiving module 640 is configured to: when the message B is the downlink control channel PDCCH scrambled by the wireless network temporary identifier msgB-RNTI of the message B And when the PDCCH schedules downlink transmission, it receives the protocol data unit MAC PDU of the media intervention control layer according to the downlink resource scheduled by the PDCCH; the retransmission module 630 is configured to carry the uplink scheduling
  • the calculation method of the msgB-RNTI is the same as the calculation method of the random access wireless network temporary identifier RN-RNTI.
  • the MAC PDU also carries: a timing alignment command TAC.
  • the retransmission module 630 is further configured to: when the message B is a downlink control channel PDCCH scrambled by the cell radio network temporary identification C-RNTI, and the PDCCH is used for scheduling uplink transmission, according to the The UL grant indicated by the PDCCH retransmits the payload; wherein the hybrid automatic repeat request HARQ process ID associated with the UL grant is the same as the fixed HARQ process ID used by the payload, or the PDCCH carries a new data indication, so The new data indication is used to indicate retransmission.
  • the technical solution provided by the embodiments of the present application sends a message B for scheduling uplink resources to the UE to retransmit the load when the base station fails to successfully receive the load, and the UE sends the message B to the base station after receiving the message B.
  • the load is retransmitted, thereby realizing the retransmission scheduling of the load to complete the two-step random access process based on non-competition, and improve the access success rate of the two-step random process based on non-competition.
  • FIG. 8 shows a block diagram of a two-step random access device based on non-contention provided by an exemplary embodiment of the present application.
  • the device 800 has the function of realizing the above method embodiment on the base station side, and the function can be realized by hardware, or by hardware executing corresponding software.
  • the device 800 may include: a message receiving module 810 and a message sending module 820.
  • the message receiving module 810 is configured to receive message A, the message A includes: a random access preamble and a payload, where the random access preamble is a UE-specific random access preamble, and the payload is on the UE-specific uplink shared channel PUSCH Upload
  • the message sending module 820 includes: an identification determining module 821, configured to determine the message B wireless network temporary identifier msgB-RNTI of the UE according to the random access preamble;
  • the module 822 is used to send message B, the message B is a downlink control channel PDCCH scrambled by the wireless network temporary identifier msgB-RNTI of the message B, and the downlink control information DCI in the PDCCH is used to schedule downlink transmission;
  • data retransmission module 823 configured to receive a protocol data unit MAC PDU of the media intervention control layer on the downlink resource scheduled by the PDCCH, where the MAC PDU carries an uplink scheduling authorization UL grant.
  • the technical solution provided by the embodiments of the present application sends a message B for scheduling uplink resources to the UE to retransmit the load when the base station fails to successfully receive the load, and the UE sends the message B to the base station after receiving the message B.
  • the load is retransmitted, thereby realizing the retransmission scheduling of the load to complete the two-step random access process based on non-competition, and improve the access success rate of the two-step random process based on non-competition.
  • FIG. 10 shows a block diagram of a communication device provided by an exemplary embodiment of the present application.
  • the communication device may be the access network device 11 in the block diagram of the communication system shown in FIG. 1, such as a base station, which is used to execute the aforementioned two-step random access method based on non-competition on the base station side; or it may be as shown in FIG.
  • the terminal 20 in the block diagram of the communication system, such as a UE is used to execute the aforementioned two-step random access method based on non-contention on the UE side.
  • a base station such as a base station
  • the terminal 20 in the block diagram of the communication system such as a UE, is used to execute the aforementioned two-step random access method based on non-contention on the UE side.
  • the receiver 1002 and the transmitter 1003 may be implemented as a transceiver 1006, which may be a communication chip.
  • the memory 1004 can be implemented by any type of volatile or non-volatile storage device or a combination thereof.
  • the volatile or non-volatile storage device includes but is not limited to: RAM (Random-Access Memory, random access memory) And ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory) Storage), flash memory or other solid-state storage technology, CD-ROM, DVD (Digital Video Disc, high-density digital video disc) or other optical storage, tape cartridges, magnetic tape, disk storage or other magnetic storage devices. among them:
  • the processor 1001 is configured to retransmit the payload according to the message B monitored by the transceiver.
  • the transceiver 1006 is configured to: when the message B is a downlink control channel PDCCH scrambled by the message B radio network temporary identifier msgB-RNTI, and the PDCCH is used for scheduling downlink transmission, according to the PDCCH
  • the scheduled downlink resource receives the protocol data unit MAC PDU of the media intervention control layer; the processor 1001 is configured to, when the uplink scheduling authorization UL grant is carried in the MAC PDU, reproduce the uplink resource scheduled by the UL grant Pass the load.
  • the MAC PDU also carries: a timing alignment command TAC.
  • the processor is configured to, when the message B is a downlink control channel PDCCH scrambled by the cell radio network temporary identifier C-RNTI, and the PDCCH is used to schedule uplink transmission, according to the indication of the PDCCH UL grants retransmission of the payload; wherein, the PDCCH carries a new data indication, and the new data indication is used to indicate retransmission.
  • the message B is a downlink control channel PDCCH scrambled by the cell radio network temporary identifier C-RNTI
  • the PDCCH is used to schedule uplink transmission, according to the indication of the PDCCH UL grants retransmission of the payload; wherein, the PDCCH carries a new data indication, and the new data indication is used to indicate retransmission.

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Abstract

本申请公开了一种基于非竞争的两步随机接入方法、装置、设备及存储介质,属于移动通信技术领域。所述方法包括:UE发送消息A;基站接收消息A;基站判断是否成功接收消息A的PUSCH中传输的载荷;当基站未能成功接收载荷时,发送用于重传载荷的消息B;终端在消息B的监听窗口中,监听消息B;终端重传载荷;当基站成功接收载荷时,基站发送用于指示允许接入基站的消息B;终端接收消息B。本申请提供的技术方案,通过向UE发送用于实现对载荷重传的消息B,UE接收到消息B后向基站重传载荷,从而实现了对载荷的重传调度,以完成基于非竞争的两步随机接入过程,提高了基于非竞争的两步随机过程的接入成功率。

Description

基于非竞争的两步随机接入方法、装置、终端及存储介质 技术领域
本申请涉及移动通信领域,特别涉及一种基于非竞争的两步随机接入方法、装置、终端及存储介质。
背景技术
RACH(Random Access Channel,随机接入信道)是在接入网设备与UE(User Equipment,用户终端)初始接入过程中非常重要的信道。LTE(Long-Term Evolution,长期演进)使用基于非竞争的四步随机接入机制,在NR(New Radio,新空口)系统中的某些使用场景下会简化为基于非竞争的两步随机接入机制。
基于非竞争的两步随机接入机制,主要包括:UE采用消息A(MsgA)将随机接入前导码(preamble)与载荷(payload)共同发送给接入网设备,而接入网设备也会采用消息B(MsgB)将接入解决消息发送给UE。当接入网设备只解调出随机接入前导码且未能时,接入网设备需要调度载荷的重传。
在基于非竞争的四步随机接入机制中,重传调度基于TC-RNT1(Temporary Cell Radio Network Temporary Identifier,临时小区无线网络临时标识),然而,基于非竞争的两步随机接入机制中,UE并没有TC-RNT1,因此在基于非竞争的两步随机接入机制如何完成载荷的重传调度是亟待解决的问题。
发明内容
本申请实施例提供了一种基于非竞争的两步随机接入方法、装置、终端及存储介质,可以解决相关技术中基于非竞争的两步随机接入机制如何完成载荷的重传调度的技术问题。所述技术方案如下:
根据本申请的一个方面,提供了一种基于非竞争的两步随机接入方法,所述方法应用于UE中,所述方法包括:
发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的PUSCH(Physical Uplink Shared Channel,物理上行共享信道)上传输;
在消息B的监听窗口中,监听所述消息B;
根据所述消息B重传所述载荷。
根据本申请的一个方面,提供了一种基于非竞争的两步随机接入装置,所述装置包括:
发送模块,用于发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的PUSCH上传输;
监听模块,用于在消息B的监听窗口中,监听所述消息B;
重传模块,用于根据所述消息B重传所述载荷。
根据本申请的一个方面,一种通信设备,所述通信设备包括处理器和与所述处理器相连的收发器;其中:
所述收发器,用于发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的上行共享信道PUSCH上传输;
所述收发器,用于在消息B的监听窗口中,监听所述消息B;
所述处理器,用于根据所述收发器监听到的所述消息B重传所述载荷。
根据本申请的一个方面,提供了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至少一条指令、至少一段程序、代码集或指令集,所述至少一条指令、所述至少一段程序、所述代码集或所述指令集由处理器加载并执行以实现如上述基于非竞争的两步随机接入方法。
根据本申请的一个方面,提供了一种芯片,所述芯片包括可编程逻辑电路和/或程序指令,当所述芯片运行时,用于实现如上述基于非竞争的两步随机接入方法。
根据本申请的一个方面,提供了一种计算机程序产品,所述计算机程序产品包括一个或多个计算机程序,所述计算机程序被处理器执行时,用于实现如上述基于非竞争的两步随机接入方法。
本申请提供的技术方案至少具有如下技术效果:
在基站未能成功接收基于非竞争的两步随机接入过程中消息A的载荷时,通过向UE发送用于调度上行资源以实现对载荷重传的消息B,UE接收到消息B后根据消息B的指示及调度向基站重传载荷,从而实现了对消息A中的载荷的重传调度,以完成基于非竞争的两步随机接入过程,提高了基于非竞争的两步随机过程的接入成功率。
附图说明
为了更清楚地说明本申请实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是本申请一个示例性实施例提供的通信系统的框图;
图2是本申请一个示例性实施例提供的基于非竞争的两步随机接入方法的流程图;
图3是本申请另一个示例性实施例提供的基于非竞争的两步随机接入方法的流程图;
图4是本申请又一个示例性实施例提供的基于非竞争的两步随机接入方法的流程图;
图5是本申请再一个示例性实施例提供的基于非竞争的两步随机接入方法的流程图;
图6是本申请一个示例性实施例提供的基于非竞争的两步随机接入装置的框图;
图7是本申请另一个示例性实施例提供的基于非竞争的两步随机接入装置的框图;
图8是本申请又一个示例性实施例提供的基于非竞争的两步随机接入装置的框图;
图9是本申请再一个示例性实施例提供的基于非竞争的两步随机接入装置的框图;
图10是本申请一个示例性实施例提供的通信设备的框图。
具体实施方式
这里将详细地对示例性实施例进行说明,其示例表示在附图中。下面的描述涉及附图时,除非另有表示,不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反,它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
图1示出了本申请一个示例性实施例提供的通信系统的框图。如图1所示,该通信系统可以包括:接入网10和终端20。
接入网10中包括若干个接入网设备11。接入网10在5G NR系统中可以称为NG-RAN(New Generation-Radio Access Network,新一代无线接入网);接入网设备11可以是基站,该基站11是一种部署在接入网10中为终端20提供无线通信功能的装置,基站11包括各种形式的宏基站,微基站,中继站,接入点等等。在采用不同的无线接入技术的系统中,具备基站功能的设备的名称可能会有所不同,例如在LTE系统中,称为eNB(evolved NodeB);在5G NR系统中,称为gNodeB或者gNB(next generation NodeB)。随着通信技术的演进,“基站”这一描述可能会变化。为方便本申请实施例中,上述为终端20提供无线通信功能的装置统称为接入网设备。
终端20的数量通常为多个,每一个接入网设备11所管理的小区内可以分布一个或多个终端20。终端20可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其他处理设备,以及各种形式的UE、MS(Mobile Station,移动台)等等。为方便描述,上面提到的设备统称为终端。接入网设备11与终端20之间通过某种空中技术互相通信,例如Uu接口。
在终端20与接入网设备11的通信过程中,终端20一旦发现一个小区,就可能通过与该小区的接入网设备11连接的方式接入该小区,终端20与该接入网设备11连接的过程被称为随机接入过程。假设小区A和小区B是不同的小区,终端20从小区A进入小区B时,需要将与小区A的接入网设备11之间的连接,切换为与小区B的接入网设备11之间的连接,终端20在不同的接入网设备11之间进行切换的过程被称为基于非竞争的随机接入过程。
目前,基于非竞争的随机接入过程包括基于非竞争的四步随机接入过程和基于非竞争的两步随机接入过程,本申请实施例的技术方案可以应用于基于非竞争的两步随机接入过程中,但也可以适用于后续演进的其他基于非竞争的随机接入过程,本申请实施例对此不作限定。
本申请实施例中的“5G NR系统”也可以称为5G系统或者NR系统,但本领域技术人员可以理解其含义。本申请实施例描述的技术方案可以适用于5G NR系统,也可以适用于5G NR系统后续的演进系统,本申请实施例对此不作限定。
在传统的基于非竞争的四步随机接入机制中,UE向基站发送包括随机接入前导码的消息1,基站接收到消息1后向UE发送包括随机接入响应的消息2,UE接收到消息2后向基站发送包括身份信息(或其他载荷)的消息3,基站接收到消息3后向UE发送包括接入解决消息的消息4。其中,身份信息是UE ID(User Equipment Identify,用户设备身份信息),例如UE ID可以是C-RNTI(Cell Radio Network Temporary Identifier,小区无线网络临时标识),也可以是TC-RNTI,还可以RA-RNTI(Random Access Radio Network Temporary Identifier,随机接入无线网络临时标识)等。
在基于非竞争的两步随机接入机制中,可以将基于非竞争的四步随机接入机制中,UE发送给基站的消息1和消息3合并为消息A,基站发送给UE的消息2和消息4合并为下文所述的消息B。
需要说明的是,下面本申请示例性实施例仅以基于非竞争的随机接入方法为基于非竞争的两步随机接入方法,以及应用于UE接入基站为例进行举例说明,本领域技术人员在了解本申请的技术方案后,将很容易想到将本申请提供的基于非竞争的随机接入方法为后续演进的其他基于非竞争的随机接入方法,以及应用于其他终端接入其他接入网设备的情况,如MS接入基站等,但应当将这些扩展方案纳入本申请的保护范围。
请参考图2,其示出了本申请一个示例性实施例提供的基于非竞争的两步随机接入方法的流程图。该方法可以应用于图1所示系统构架中。该方法可以包括如下几个步骤(201~208):
步骤201,UE发送消息A。
由于基于非竞争的两步随机接入机制经常用于小区切换过程中,因此消息A主要在切换(HandOver,HO)命令消息中配置,该切换命令用于控制UE进行小区切换,即将UE与小区A的基站之间的连接,切换为UE与小区B的基站之间的连接。
消息A中包括:随机接入前导码和载荷,其中,随机接入前导码为网络配置给UE的专用随机接入前导码,载荷在基站配置给UE的专用上行共享数据信道PUSCH上传输,载荷主要包括切换命令完成消息以及可能的一些用户面数据。
MAC层对应生成消息A的载荷对应的MAC PDU之后,UE将该MAC PDU(Media Access Control Protocol Data Unit,媒体接入控制层的协议数据单元)保存在一个固定的HARQ(Hybrid Auto Repeat Request,混合自动重传请求)缓冲区(buffer)中,如消息A缓冲区(或消息3缓冲区)。传输该MAC PDU的HARQ进程号为一个固定的HARQ进程号,比如HARQ process ID 0。
步骤202,基站接收消息A。
步骤203,基站判断是否成功接收消息A的PUSCH中传输的载荷;若是,则执行步骤204;若否,则执行步骤207。
步骤204,当基站未能成功接收载荷时,发送用于重传载荷的消息B。
基站接收到消息A后,即对消息A进行解码或解码,当基站没有解码出PUSCH时,即 未能成功接收载荷时,基站会向UE发送用于调度载荷重传的消息B。消息B为基站对消息A的响应,消息B用于直接或间接调度用于重传载荷的上行资源,从而实现对载荷进行重传的目的。
需要说明的一点是,因为消息A中包括UE专用的随机接入前导码,所以即便基站未能接收到在PUSCH中传输的载荷,即基站未能解码出在PUSCH中传输的载荷,基站也可以根据消息A识别该UE,得到该UE的C-RNTI。因此,不管基站是否能解码出PUSCH中传输的载荷,基站都可以向UE发送消息B,可选地,消息B中包括随机接入响应和随机接入方法。
步骤205,终端在消息B的监听窗口中,监听消息B。
本申请实施例中,UE在发送完消息A之后,会启动一个消息B的监听窗口,在该消息B监听窗口中,UE可以盲检PDCCH(Physical Downlink Control Channel,物理下行控制信道),其中,PDCCH是通过RNTI(Radio Network Temporary Identifier,无线网络临时标识)加扰的,即PDCCH是通过RNTI进行寻址的。
需要说明的是,步骤204既可以在步骤201之后实施,也可以在步骤202之后实施,还可以在步骤203之后实施,附图2将步骤204绘制在步骤201之后只是一种示例性描述,本申请对此不作限定。
步骤206,终端重传载荷。
终端接收到基站发送的消息B之后,即可以根据消息B直接或间接调度的上行资源,重传载荷,以完成基于非竞争的两步随机接入过程,即使得UE完成小区切换。
步骤207,当基站成功接收载荷时,发送用于指示允许接入基站的消息B。
示例性的,用于指示允许接入基站的消息B中未携带有UL grant。
步骤208,终端接收消息B。
综上所述,本申请实施例提供的技术方案,在基站未能成功接收基于非竞争的两步随机接入过程中消息A的载荷时,通过向UE发送用于调度上行资源以实现对载荷重传的消息B,UE接收到消息B后根据消息B的指示及调度向基站重传载荷,从而实现了对消息A中的载荷的重传调度,以完成基于非竞争的两步随机接入过程,提高了基于非竞争的两步随机过程的接入成功率。
上述消息B用于调度载荷的重传时,至少存在如下三种不同的实现方式:
一、消息B中的DCI采用C-RNTI来加扰,且DCI调度下行传输;
二、消息B中的DCI采用MsgB-RNTI(比如RA-RNTI)来加扰,且DCI调度下行传输。
三、消息B中的DCI采用C-RNTI来加扰,且DCI调度上行传输。
下面对三种不同的实现方式中进行阐述。
针对上述第一种可能的实施方式中,如图3所示,上述方法可以包括如下几个步骤:
步骤201,UE发送消息A。
由于基于非竞争的两步随机接入机制主要用于RRC连接态小区切换过程中,因此消息A主要在切换(Handover,HO)命令消息中配置,该切换命令用于控制UE进行小区切换,即将UE与小区A的基站之间的连接,切换为UE与小区B的基站之间的连接。
消息A中包括:随机接入前导码和载荷,其中,随机接入前导码为网络配置给UE的专用随机接入前导码,载荷在网络配置给UE的专用上行共享数据信道PUSCH上传输,载荷主要包括切换命令完成消息以及可能的一些用户面数据。
MAC层生成对应消息A载荷的MAC PDU之后,UE将该MAC PDU保存在一个MAC PDU保存在一个固定的HARQ缓冲区中,如消息A缓存区(或消息3缓冲区)。传输该MAC PDU的HARQ进程号为一个固定的HARQ进程号,比如HARQ process ID 0。
步骤202,基站接收消息A。
步骤203,基站判断是否成功接收消息A的PUSCH中传输的载荷;若是,则执行步骤204;若否,则执行步骤207。
步骤2041,基站根据UE专用的随机接入前导码确定UE的C-RNTI。
C-RNTI是在切换命令中配置的。由于随机接入前导码是UE专用的前导码,因此,基站可以根据UE专用的随机接入前导码确定UE的C-RNTI,该C-RNTI可以用于对PDCCH进行寻址,即可以加扰PDCCH。
步骤2042,基站发送消息B,其中,消息B为采用C-RNTI进行加扰的PDCCH。
本申请实施例中,PDCCH中包括DCI(Downlink Control Information,下行控制命令),该DCI用于调度下行传输,DCI是基站发送给UE的下行控制信息,该DCI既可以用于调度上行传输,也可以用于调度下行传输。
当DCI用于调度下行传输时,由基站在DCI调度的下行资源上向UE发送下行信息;当DCI用于调度上行传输时,由UE在DCI调度的上行资源上向基站发送上行信息。
本申请实施例中,PDCCH中的DCI用于调度下行传输。
步骤2051,UE在消息B的监听窗口中,监听消息B;
UE接收消息B,根据消息B中的PDCCH得到DCI,根据DCI调度来接收下行数据。
UE在发送完消息A后会启动一个监听窗口,在该监听窗口中,UE可以盲检PDCCH,本申请实施例中,PDCCH采用C-RNTI进行加扰,且PDCCH中包含的DCI中包含有DA(Downlink Assignment,下行分配),该DA中调度PDSCH(Physical Downlink Shared Channel,物理下行共享信道)。
步骤2043,基站在PDCCH调度的下行资源上发送MAC PDU。
基站在PDCCH中的DCI调度的下行资源上发送MAC PDU。
步骤2052,UE接收并解码出MAC PDU。
本申请实施例对MAC PDU中包含的内容不作限定,可选地,该MAC PDU中可以包括TAC(Timing Alignment Command,定时对齐命令),也可以包括TAC和UL grant(Up Link grant,上行调度资源),还可以包括回退RAR(fallback RAR)。
在一种示例中,当该MAC PDU中包括TAC和UL grant时,TAC和UL grant既可以携 带在MAC PDU中的相同的MAC CE(Media Access Control Control Element,媒体接入控制层的控制单元)中,也可以携带在MAC PDU中的不同的MAC CE中。其中,TAC是一种定时对齐命令,用于对齐基站与UE的时域定时。
可选地,UL grant用于调度用于重传载荷的上行资源。
在另一种示例中,当该MAC PDU包括回退RAR时,回退RAR用于指示UE需要重传载荷,回退RAR中至少包括UL grant、TAC和TC-RNTI。
示例性地,若该MAC PDU中包括TAC和UL grant,或者,该MAC PDU中包括回退RAR,则表示需要UE重传载荷。
步骤206,若MAC PDU携带有UL grant,则UE在UL grant调度的上行资源上重传载荷。
当UE解码出MAC PDU之后,若该MAC PDU中携带有UL grant,则表示需要UE向基站重传载荷,UE根据UL grant调度的上行资源重传载荷。
UE的MAC层从保存载荷的消息A缓冲区(或消息3缓冲区)中获得保存的MAC PDU,并在UL grant中传输该MAC PDU。
步骤207,当基站成功接收载荷时,发送用于指示允许接入基站的消息B。
示例性地,用于指示允许接入基站的消息B,也是采用C-RNTI进行加扰的PDCCH,PDCCH中的DCI用于调度下行传输。
示例性地,该DCI调度的下行传输所发送的MAC PDU中包括TAC,而不包括UL grant或回退RAR,则表示基站成功接收载荷,此时不需要UE重传载荷,UE清除用于传输载荷的HARQ缓冲区后即可完成基于非竞争的两步随机接入过程。
步骤208,终端接收消息B。
综上所述,本申请实施例提供的技术方案,通过在消息B中携带包括DCI的PDCCH,基站在DCI调度的下行资源上发送MAC PDU,UE接收到MAC PDU后对该MAC PDU进行解码,根据解码结果指示的MAC PDU中包括的内容的不同决定是否重传载荷,提供了一种判断是否需要重传载荷的方法,若需要重传载荷,则UE向基站重传载荷以实现基于非竞争的两步随机接入过程。
在针对第二种可能的实施方式中,在基于图3所示实施例的基础上,当基站未能成功接收载荷时,步骤2041至步骤2043可替换实现成为上述方法可以包括如下几个步骤,如图4所示:
步骤204a,基站根据UE专用的随机接入前导码确定UE的msgB-RNTI(message B Radio Network Temporary Identifier,消息B的无线网络临时标识)。
msgB-RNTI是消息B对应的无线网络临时标识。当基站未成功接收载荷时,基站根据UE用于传输专用的随机接入前导码的随机接入时频资源位置确定UE的msgB-RNTI,该msgB-RNTI可以加扰PDCCH。当基站成功接收载荷时,基站根据UE专用的随机接入前导码确定UE的C-RNTI,该C-RNTI可以加扰PDCCH。也即,基站在成功接收载荷时,使用C-RNTI加扰PDCCH;基站在未成功接收载荷时,使用msgB-RNTI加扰PDCCH。
可选地,msgB-RNTI的计算方式与RA-RNTI的计算方式相同。RA-RNTI是基于非竞争的四步随机接入机制中的一种无线网络临时标识,RA-RNTI由承载消息1的PRACH(Physical Random Access Channel,物理随机接入信道)时频资源位置确定。当msgB-RNTI的计算方式与RN-RNTI的计算方式相同时,该msgB-RNTI的计算公式如下:
msgB-RNTI=1+s_id+14×t_id+14×f_id+14×80×8×ul_carrier_id
其中,s_id是指定PRACH(Physical Random Access Channel,物理随机接入信道)的第一个OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)符号的索引(0≤s_id<14),t_id是系统帧中指定PRACH的第一个时隙的索引(0≤t_id<80),f_id是索引频域中指定的PRACH的值(0≤f_id<8),ul_carrier_id是用于消息A(或消息1)传输的UL(Uplink,上行)载波(0表示NUL(Normal Uplink,正常上行)载波,1表示SUL(Supplementary Uplink,补充上行)载波)。
步骤204b,基站发送消息B,其中,消息B是采用MsgB-RNTI进行加扰的PDCCH。
本申请实施例中,PDCCH中包括DCI(Downlink Control Information,下行控制命令),该DCI用于调度下行传输,DCI是基站发送给UE的下行控制信息,该DCI既可以用于调度上行传输,也可以用于调度下行传输。
当DCI用于调度下行传输时,由基站在DCI调度的下行资源上向UE发送下行信息;当DCI用于调度上行传输时,由UE在DCI调度的上行资源上向基站发送上行信息。
本申请实施例中,PDCCH中的DCI用于调度下行传输。
步骤205a,UE在消息B的监听窗口中,UE既监听msgB-RATI加扰的PDCCH,又同时监听C-RNTI加扰的PDCCH。
UE在发送完消息A后会启动一个监听窗口,在该监听窗口中,UE可以盲检PDCCH。本申请实施例中,当基站未能成功接收载荷时,PDCCH采用msgB-RNTI进行加扰,当基站成功接收载荷时,PDCCH采用C-RNTI加扰。UE在消息B的监听窗口中既监听消息msgB-RATI加扰的PDCCH,又同时监听C-RNTI加扰的PDCCH,若UE监听到msgB-RNTI加扰的PDCCH,则意味着UE需要重传载荷;若UE监听到C-RNTI加扰的PDCCH,则意味着网络成功接收到msgA。
UE接收消息B,根据消息B中的PDCCH得到DCI,根据DCI调度来接收下行数据。PDCCH中包含的DCI中包含有DA,该DA中调度PDSCH。
步骤204c,基站在PDCCH调度的下行资源上发送MAC PDU。
本申请实施例对MAC PDU中包含的内容不作限定,可选地,该MAC PDU中可以包括TAC(Timing Alignment Command,定时对齐命令),也可以包括TAC和UL grant(Up Link grant,上行调度资源),还可以包括回退RAR(fallback RAR)。
在一种示例中,当该MAC PDU中包括TAC和UL grant时,TAC和UL grant既可以携带在MAC PDU中的相同的MAC CE(Media Access Control Control Element,媒体接入控制层的控制单元)中,也可以携带在MAC PDU中的不同的MAC CE中。其中,TAC是一种时间对齐命令,用于对齐基站与UE的时域定时。
可选地,UL grant用于调度用于重传载荷的上行资源。
在另一种示例中,当该MAC PDU包括回退RAR时,回退RAR用于指示UE需要重传载荷,回退RAR中至少包括UL grant、TAC和TC-RNTI。
示例性地,若该MAC PDU中包括TAC和UL grant,或者,该MAC PDU中包括回退RAR,则表示需要UE重传载荷。
与上一实施例相比,UE不需要解码MAC PDU即可根据MsgB-RNTI确定是否需要重传载荷。若基站成功接收载荷,则消息B中的PDCCH是采用C-RNTI加扰的;若基站未能成功接收载荷,则消息B中的PDCCH是采用msgB-RNTI加扰的。当UE接收到消息B,即可根据该消息B中的PDCCH的加扰方式确定是否需要重传载荷。若UE需要向基站重传载荷,则UE根据MAC PDU携带的UL grant调度的上行资源重传载荷。
综上所述,本申请实施例提供的技术方案,通过根据基站是否成功接收载荷采用不同的方式对PDCCH加扰,若基站成功接收载荷,采用C-RNTI对PDCCH加扰,若基站未能成功接收载荷,采用msgB-RNTI对PDCCH加扰,从而UE在接收到包括PDCCH的消息B时,不需要通过解码即可确定是否需要重传载荷,提升了确定是否重传载荷的速度。
在针对第二种可能的实施方式中,如图5所示,上述方法包括如下几个步骤:
步骤201,UE发送消息A。
由于基于非竞争的两步随机接入机制经常用于小区切换过程中,因此消息A主要在切换(HandOver,HO)命令消息中配置,该切换命令用于控制UE进行小区切换,即将UE与小区A的基站之间的连接,切换为UE与小区B的基站之间的连接。
消息A中包括:随机接入前导码和载荷,其中,随机接入前导码为网络配置给UE的专用随机接入前导码,载荷在网络配置给UE的专用上行共享数据信道PUSCH上传输,载荷主要包括切换命令完成消息以及可能的一些用户面数据。
载荷在MAC层对应生成MAC PDU之后,UE将该MAC PDU保存在一个MAC PDU保存在一个固定的HARQ缓冲区中,如消息A缓冲区(或消息3缓冲区)。传输该MAC PDU的HARQ进程号为一个固定的HARQ进程号,比如HARQ process ID 0。
步骤202,基站接收消息A。
步骤203,基站判断是否成功接收消息A的PUSCH中传输的载荷;若是,则执行步骤204;若否,则执行步骤207。
步骤204A,基站根据UE专用的随机接入前导码确定UE的C-RNTI。
步骤204B,基站发送消息B,其中,消息B是采用C-RNTI加扰的PDCCH。
本申请实施例中,PDCCH中包括DCI,该DCI用于调度下行传输,DCI是基站发送给UE的下行控制信息,该DCI中包括UL grant,该UL grant用于调度上行资源。
可选地,该DCI中还可以包含一个指示上行定时对齐的指令,即TAC。
在一个示例中,当DCI包含的HARQ进程ID与载荷使用的HARQ进程ID相同时,UE确定UL grant用于调度上行资源重传载荷,可选地,所述载荷使用的HARQ进程ID为固定 的HARQ进程ID。
在另一个示例中,DCI中携带有新数据指示(NDI),且该新数据指示用于指示重传时,UE确定UL grant用于调度上行资源重传载荷。例如,NDI的比特值为0时,则该NDI用于指示重传;或者,该NDI的比特值为1时,则该NDI用于指示重传。需要说明的是,此处并未使用NDI的取值翻转来指示重传。
步骤205,UE在消息B的监听窗口中,监听消息B;
UE接收消息B,根据消息B中的PDCCH得到DCI,根据DCI调度来接收下行数据。
UE在发送完消息A后会启动一个监听窗口,在该监听窗口中,UE可以盲检PDCCH,本申请实施例中,PDCCH采用C-RNTI进行加扰,且PDCCH中包含的DCI中包含有UL grant。
步骤206,UE根据UL grant调度的上行资源重传载荷。
消息A的PDSCH中传输的载荷保存在一个固定的HARQ缓冲区中,如消息A缓冲区。
UE在UL grant调度的上行资源上重传载荷。
步骤207,当基站成功接收载荷时,发送用于指示允许接入基站的消息B。
示例性地,用于指示允许接入基站的消息B,也是采用C-RNTI进行加扰的PDCCH,PDCCH中的DCI中包括TAC。
步骤208,终端接收消息B。
综上所述,本申请实施例提供的技术方案,通过在DCI中携带UL grant,基站发送给UE的消息B中包括包含DCI的PDCCH,从而UE在接收到DCI后,根据该DCI中的UL grant调度的上行资源重传载荷,扩展了一种载荷重传的方式,以完成基于非竞争的两步随机接入过程,进一步提高了基于非竞争的两步随机过程的接入成功率。
需要说明的一点是,在上述方法实施例中,仅从基站和UE交互的角度,对本申请技术方案进行了介绍说明。上述有关基站执行的步骤,可以单独实现成为基站侧基于非竞争的两步随机接入方法,上述有关UE执行的步骤,可以单独实现成为UE侧基于非竞争的两步随机接入方法。
下述为本申请装置实施例,可以用于执行本申请方法实施例。对于本申请装置实施例中未披露的细节,请参照本申请方法实施例。
请参考图6,其示出了本申请一个示例性实施例提供的基于非竞争的两步随机接入装置的框图。该装置600具有实现上述UE侧的方法实施例的功能,该功能可以由硬件实现,也可以由硬件执行相应的软件实现。该装置600可以包括:发送模块610、监听模块620和重传模块630。
发送模块610,用于发送消息A,所述消息A包括:随机接入前导码和载荷,其中随机接入前导码为UE专用的随机接入前导码,载荷在UE专用的上行共享信道PUSCH上传输。
监听模块620,用于在消息B的监听窗口中,监听所述消息B。
重传模块630,用于当所述消息B用于调度对所述载荷进行重传时,重传所述载荷。
可选地,如图7所示,所述装置600还包括接收模块640:所述接收模块640,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;所述重传模块630,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
可选地,如图7所示,所述装置600还包括接收模块640:所述接收模块640,用于当所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,且所述PDCCH调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;所述重传模块630,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
可选地,所述msgB-RNTI的计算方式与随机接入无线网络临时标识RN-RNTI的计算方式相同。
可选地,所述MAC PDU中还携带有:定时对齐命令TAC。
可选地,所述TAC与所述UL grant携带在所述MAC PDU中的相同或不同的媒体介入控制层的控制单元MAC CE;或,所述TAC与所述UL grant携带在所述MAC PDU中的回退随机接入响应回退RAR。
可选地,所述重传模块630还用于:当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;其中,所述UL grant关联的混合自动重传请求HARQ进程ID与所述载荷使用的固定HARQ进程ID相同,或者,所述PDCCH携带新数据指示,所述新数据指示用于指示重传。
综上所述,本申请实施例提供的技术方案,在基站未能成功接收载荷时,通过向UE发送用于调度上行资源以实现对载荷重传的消息B,UE接收到消息B后向基站重传载荷,从而实现了对载荷的重传调度,以完成基于非竞争的两步随机接入过程,提高了基于非竞争的两步随机过程的接入成功率。
请参考图8,其示出了本申请一个示例性实施例提供的基于非竞争的两步随机接入装置的框图。该装置800具有实现上述基站侧的方法实施例的功能,该功能可以由硬件实现,也可以由硬件执行相应的软件实现。该装置800可以包括:消息接收模块810、消息发送模块820。
消息接收模块810,用于接收消息A,所述消息A包括:随机接入前导码和载荷,其中随机接入前导码为UE专用的随机接入前导码,载荷在UE专用的上行共享信道PUSCH上传输;
消息发送模块820,用于当未能成功接收所述载荷时,发送消息B,所述消息B用于调度对所述载荷进行重传。
可选地,如图9所示,所述消息发送模块820包括:标识确定模块821,用于根据所述 随机接入前导码确定所述UE的小区无线网络临时标识C-RNTI;信息发送模块822,用于发送消息B,所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,所述PDCCH中的下行控制信息DCI用于调度下行传输;数据发送模块823,用于在所述PDCCH调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU,所述MAC PDU携带有上行调度授权UL grant。
可选地,如图9所示,所述消息发送模块820包括:标识确定模块821,用于根据所述随机接入前导码确定所述UE的消息B无线网络临时标识msgB-RNTI;信息发送模块822,用于发送消息B,所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,所述PDCCH中的下行控制信息DCI用于调度下行传输;数据重传模块823,用于在所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU,所述MAC PDU携带有上行调度授权UL grant。
可选地,所述msgB-RNTI的计算方式与随机接入无线网络临时标识RN-RNTI的计算方式相同。
可选地,所述MAC PDU中还携带有:定时对齐命令TAC。
可选地,所述TAC与所述UL grant携带在所述MAC PDU中的相同或不同的媒体介入控制层的控制单元MAC CE;或,所述TAC与所述UL grant携带在所述MAC PDU中的回退随机接入响应回退RAR。
可选地,所述消息发送模块820包括:标识确定模块821,用于根据所述随机接入前导码确定所述UE的小区无线网络临时标识C-RNTI;数据发送模块824,用于发送消息B,所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,所述PDCCH用于调度下行传输,所述PDCCH指示的UL grant用于调度上行传输;其中,所述UL grant关联的HARQ进程ID与所述载荷使用的固定HARQ进程ID相同,或者,所述PDCCH携带新数据指示,所述新数据指示用于指示重传。
综上所述,本申请实施例提供的技术方案,在基站未能成功接收载荷时,通过向UE发送用于调度上行资源以实现对载荷重传的消息B,UE接收到消息B后向基站重传载荷,从而实现了对载荷的重传调度,以完成基于非竞争的两步随机接入过程,提高了基于非竞争的两步随机过程的接入成功率。
需要说明的是,本申请实施例提供的装置,在实现其功能时,仅以上述各功能模块的划分进行举例说明,实际应用中,可以根据需要而将上述功能分配由不同的功能模块完成,即将装置的内部结构划分成不同的功能模块,以完成以上描述的全部或者部分功能。另外,上述实施例提供的装置与方法实施例属于同一构思,其具体实现过程详见方法实施例,这里不再赘述。
请参考图10,其示出了本申请一个示例性实施例提供的通信设备的框图。例如,该通信设备可以是图1所示通信系统的框图中的接入网设备11,如基站,用于执行上述基站侧基于 非竞争的两步随机接入方法;也可以是图1所示通信系统的框图中的终端20,如UE,用于执行上述UE侧基于非竞争的两步随机接入方法。具体来讲:
处理器1001包括一个或者一个以上处理核心,处理器1001通过运行软件程序以及模块,从而执行各种功能应用以及信息处理。
接收器1002和发射器1003可以实现为一个收发器1006,该收发器可以是一块通信芯片。
存储器1004通过总线1005与处理器1001相连。
此外,存储器1004可以由任何类型的易失性或非易失性存储设备或者它们的组合实现,易失性或非易失性存储设备包括但不限于:RAM(Random-Access Memory,随机存储器)和ROM(Read-Only Memory,只读存储器)、EPROM(Erasable Programmable Read-Only Memory,可擦写可编程只读存储器)、EEPROM(Electrically Erasable Programmable Read-Only Memory,电可擦写可编程只读存储器)、闪存或其他固态存储其技术,CD-ROM、DVD(Digital Video Disc,高密度数字视频光盘)或其他光学存储、磁带盒、磁带、磁盘存储或其他磁性存储设备。其中:
所述收发器1006,用于发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的上行共享信道PUSCH上传输。
所述收发器1006,用于在消息B的监听窗口中,监听所述消息B。
所述处理器1001,用于根据所述收发器监听到的所述消息B重传所述载荷。
可选地,所述收发器1006,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;所述处理器1001,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
可选地,所述收发器1006,用于当所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;所述处理器1001,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
可选地,所述msgB-RNTI的计算方式与随机接入无线网络临时标识RN-RNTI的计算方式相同。
可选地,所述MAC PDU中还携带有:定时对齐命令TAC。
可选地,所述TAC与所述UL grant携带在所述MAC PDU中的相同或不同的媒体介入控制层的控制单元MAC CE;或,所述TAC与所述UL grant携带在所述MAC PDU中的回退随机接入响应回退RAR。
可选地,所述处理器1001,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;其中,所述UL grant关联的混合自动重传请求HARQ进程ID与所述载 荷使用的HARQ进程ID相同。
可选地,所述处理器,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;其中,所述PDCCH携带新数据指示,所述新数据指示用于指示重传。
本申请实施例中,还提供了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至少一条指令、至少一段程序、代码集或指令集,所述至少一条指令、所述至少一段程序、所述代码集或指令集由所述处理器加载并执行以实现上述UE侧的基于非竞争的两步随机接入方法。
本申请实施例中,还提供了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至少一条指令、至少一段程序、代码集或指令集,所述至少一条指令、所述至少一段程序、所述代码集或指令集由所述处理器加载并执行以实现上述基站侧的基于非竞争的两步随机接入方法。
本申请实施例中,还提供了一种芯片,所述芯片包括可编程逻辑电路和/或程序指令,当所述芯片运行时,用于实现如上述UE侧的基于非竞争的两步随机接入方法。
本申请实施例中,还提供了一种芯片,所述芯片包括可编程逻辑电路和/或程序指令,当所述芯片运行时,用于实现如上述基站侧的基于非竞争的两步随机接入方法。
本申请实施例中,还提供了一种计算机程序产品,当该计算机程序产品被UE的处理器执行时,其用于实现上述UE侧的基于非竞争的两步随机接入方法。
本申请实施例中,还提供了一种计算机程序产品,当该计算机程序产品被基站的处理器执行时,其用于实现上述基站侧的基于非竞争的两步随机接入方法。
应当理解的是,在本文中提及的“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这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
以上所述仅为本申请的示例性实施例,并不用以限制本申请,凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。

Claims (25)

  1. 一种基于非竞争的两步随机接入方法,其特征在于,所述方法应用于用户设备UE中,所述方法包括:
    发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的上行共享信道PUSCH上传输;
    在消息B的监听窗口中,监听所述消息B;
    根据所述消息B重传所述载荷。
  2. 根据权利要求1所述的方法,其特征在于,所述当所述消息B用于调度所述载荷进行重传时,重传所述载荷,包括:
    当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;
    在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
  3. 根据权利要求1所述的方法,其特征在于,所述当所述消息B用于调度所述载荷进行重传时,重传所述载荷,包括:
    当所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;
    在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
  4. 根据权利要求3所述的方法,其特征在于,所述msgB-RNTI的计算方式与随机接入无线网络临时标识RN-RNTI的计算方式相同。
  5. 根据权利要求2至4任一项所述的方法,其特征在于,所述MAC PDU中还携带有:定时对齐命令TAC。
  6. 根据权利要求5所述的方法,其特征在于,
    所述TAC与所述UL grant携带在所述MAC PDU中的相同或不同的媒体介入控制层的控制单元MAC CE;
    或,
    所述TAC与所述UL grant携带在所述MAC PDU中的回退随机接入响应回退RAR。
  7. 根据权利要求1所述的方法,其特征在于,所述当所述消息B用于调度所述载荷进行重传时,重传所述载荷,包括:
    当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;
    其中,所述UL grant关联的混合自动重传请求HARQ进程ID与所述载荷使用的HARQ进程ID相同。
  8. 根据权利要求1所述的方法,其特征在于,所述根据所述消息B重传所述载荷,包括:
    当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;
    其中,所述PDCCH携带新数据指示,所述新数据指示用于指示重传。
  9. 一种基于非竞争的两步随机接入装置,其特征在于,所述装置包括:
    发送模块,用于发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的上行共享信道PUSCH上传输;
    监听模块,用于在消息B的监听窗口中,监听所述消息B;
    重传模块,用于根据所述消息B重传所述载荷。
  10. 根据权利要求9所述的装置,其特征在于,所述装置还包括接收模块:
    所述接收模块,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;
    所述重传模块,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
  11. 根据权利要求9所述的装置,其特征在于,所述装置还包括接收模块:
    所述接收模块,用于当所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;
    所述重传模块,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
  12. 根据权利要求11所述的装置,其特征在于,所述msgB-RNTI的计算方式与随机接入无线网络临时标识RN-RNTI的计算方式相同。
  13. 根据权利要求10至12任一项所述的装置,其特征在于,所述MAC PDU中还携带有:定时对齐命令TAC。
  14. 根据权利要求13所述的装置,其特征在于,
    所述TAC与所述UL grant携带在所述MAC PDU中的相同或不同的媒体介入控制层的控制单元MAC CE;
    或,
    所述TAC与所述UL grant携带在所述MAC PDU中的回退随机接入响应回退RAR。
  15. 根据权利要求9所述的装置,其特征在于,所述重传模块还用于:
    当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;
    其中,所述UL grant关联的混合自动重传请求HARQ进程ID与所述载荷使用的HARQ进程ID相同。
  16. 根据权利要求9所述的装置,其特征在于,所述重传模块还用于:
    当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;
    其中,所述PDCCH携带新数据指示,所述新数据指示用于指示重传。
  17. 一种通信设备,其特征在于,所述通信设备包括处理器和与所述处理器相连的收发器;其中:
    所述收发器,用于发送消息A,所述消息A包括:随机接入前导码和载荷,所述随机接入前导码为所述UE专用的随机接入前导码,所述载荷在所述UE专用的上行共享信道PUSCH上传输;
    所述收发器,用于在消息B的监听窗口中,监听所述消息B;
    所述处理器,用于根据所述收发器监听到的所述消息B重传所述载荷。
  18. 根据权利要求17所述的通信设备,其特征在于,
    所述收发器,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体 介入控制层的协议数据单元MAC PDU;
    所述处理器,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
  19. 根据权利要求17所述的通信设备,其特征在于,
    所述收发器,用于当所述消息B为消息B无线网络临时标识msgB-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度下行传输时,根据所述PDCCH调度的下行资源接收媒体介入控制层的协议数据单元MAC PDU;
    所述处理器,用于在所述MAC PDU中携带有上行调度授权UL grant时,在所述UL grant调度的上行资源上重传所述载荷。
  20. 根据权利要求19所述的通信设备,其特征在于,所述msgB-RNTI的计算方式与随机接入无线网络临时标识RN-RNTI的计算方式相同。
  21. 根据权利要求18至20任一项所述的通信设备,其特征在于,所述MAC PDU中还携带有:定时对齐命令TAC。
  22. 根据权利要求21所述的通信设备,其特征在于,
    所述TAC与所述UL grant携带在所述MAC PDU中的相同或不同的媒体介入控制层的控制单元MAC CE;
    或,
    所述TAC与所述UL grant携带在所述MAC PDU中的回退随机接入响应回退RAR。
  23. 根据权利要求17所述的通信设备,其特征在于,
    所述处理器,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;
    其中,所述UL grant关联的混合自动重传请求HARQ进程ID与所述载荷使用的HARQ进程ID相同。
  24. 根据权利要求17所述的通信设备,其特征在于,
    所述处理器,用于当所述消息B为小区无线网络临时标识C-RNTI加扰的下行控制信道PDCCH,且所述PDCCH用于调度上行传输时,根据所述PDCCH指示的UL grant重传所述载荷;
    其中,所述PDCCH携带新数据指示,所述新数据指示用于指示重传。
  25. 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质中存储有至少一条指令、至少一段程序、代码集或指令集,所述至少一条指令、所述至少一段程序、所述代码集或所述指令集由处理器加载并执行以实现如权利要求1至7任一所述的基于非竞争的两步随机接入方法。
PCT/CN2019/109690 2019-09-30 2019-09-30 基于非竞争的两步随机接入方法、装置、终端及存储介质 WO2021062767A1 (zh)

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