WO2018127017A1

WO2018127017A1 - Communication method and network device

Info

Publication number: WO2018127017A1
Application number: PCT/CN2017/120202
Authority: WO
Inventors: 耿婷婷; 曾清海
Original assignee: 华为技术有限公司
Priority date: 2017-01-06
Filing date: 2017-12-29
Publication date: 2018-07-12
Also published as: CN108282798A; CN108282798B

Abstract

The present application provides a communication method and a network device, the method comprising: sending data transmission state report instruction information to a DU1 by means of a CU to instruct the DU1 to report data transmission state information between the DU1 and a UE; and sending, to a DU2 by means of the CU, configuration information of the UE and the data transmission state information between the DU1 and the UE reported by the DU1. Therefore, the switching of the UE from the DU1 to the DU2 is implemented, or a bearer of the UE under the DU1 is migrated to the DU2; moreover, the UE is oblivious to the process, so that the continuity of data transmission is improved.

Description

Communication method and network device

The present application claims the priority of the Chinese Patent Application, filed on Jan. 6, 2017, the application Serial No.

Technical field

The present application relates to communication technologies, and in particular, to a communication method and a network device.

Background technique

With the rapid development of wireless communication technology, New Radio Access Technology (NR) has emerged after Long Term Evolution (LTE) technology.

In the NR system, the NR cell includes a distributed architecture and a centralized architecture, and the distributed architecture includes a centralized unit (Central), and a plurality of distributed units (DUs). The CU can manage multiple DUs. When the UE moves in the NR cell, it may need to switch from one DU to another in order to obtain better data transmission service. The centralized architecture is similar to the traditional LTE network architecture, and the NR base station management The mobility of the User Equipment (UE), when the UE moves in the NR cell, may need to switch from one NR base station to another NR base station in order to obtain a better data transmission service.

In the NR system, each DU has an independent Radio Link Control (RLC) layer and/or a Medium Access Control (MAC) layer, and the UE moves within the NR cell. In the process of the DU handover, after receiving the handover indication, the UE disconnects the original DU and resets the RLC layer and/or the MAC layer on the UE side, and according to the handover indication, The data transmission can be continued after the target DU is successfully accessed. During the handover between DUs in a cell, the RLC layer and/or the MAC layer reset may cause an interruption of data transmission, thereby affecting the continuity of data transmission.

Summary of the invention

The application provides a communication method and network device to improve the continuity of data transmission.

A first aspect of the present application provides a communication method, including:

Receiving, by the second network device, data transmission status information, where the data transmission status information is used to indicate data transmission status information of the radio link control protocol stack and/or the medium access control protocol stack in the first network device; The network device has the same data transmission state information between the first network device and the UE as the first network device, and the second network device can perform data transmission with the UE according to the data transmission state information. In this process, the UE has no perception and improves the continuity of data transmission.

In one possible design, the data transmission status information includes information of data units that have not been transmitted by the first network device and/or information of untransmitted data units.

In a possible design, the information of the untransmitted data unit includes: sequence information of the untransmitted data unit;

The transmitted information of the data unit that has not received the feedback information includes at least one of the following: sequence information of the transmitted data unit that has not received the feedback information, data transmission timer, time information of the hybrid automatic repeat request HARQ process The data unit transmission confirmation information of the HARQ process, the acknowledgement information of the data unit, the maximum transmission state variable, the maximum reception state variable, the transmission state variable, the reception state variable, and the transmission window.

In one possible design, it also includes:

The second network device receives the configuration information of the UE, and the configuration information of the UE includes at least one of the following configuration parameters:

Control plane configuration parameters;

User plane configuration parameters.

In one possible design, it also includes:

The second network device receives the data unit that has not received the feedback information that has been sent by the first network device and/or the untransmitted data unit.

In a possible design, receiving a data unit and/or an unsent data unit that has been sent by the first network device and not receiving the feedback information includes:

Receiving, by the second network device, the data unit that is sent by the first network device that has not received the feedback information and/or the untransmitted data unit that is sent by the first network device;

or,

The second network device receives the data unit that has been sent by the first network device sent by the first network device and does not receive the feedback information, and/or the untransmitted data unit.

In one possible design, it also includes:

The second network device sends an acknowledgement message, where the acknowledgement message is used to indicate that the second network device and the UE are successfully established.

In one possible design, the second network device sends a confirmation message, including:

The second network device sends the confirmation information to the first network device;

The second network device sends an acknowledgement message to the third network device.

In a possible design, after the second network device sends the confirmation information to the first network device, the method further includes:

The second network device sends the link release indication information to the first network device, where the link release indication information is used to instruct the first network device to delete the configuration information and/or the data transmission status information of the UE.

In a possible design, the second network device receives the data transmission status information, including:

Receiving, by the second network device, data transmission status information sent by the first network device;

or,

Receiving, by the second network device, data transmission status information that is sent by the first network device by using the third network device;

or,

The second network device receives data transmission status information sent by the UE.

In a possible design, the second network device receives the configuration information of the UE, including:

Receiving, by the second network device, configuration information of the UE sent by the first network device;

or,

Receiving, by the second network device, configuration information of the UE that is sent by the first network device by using the third network device;

or,

The second network device receives configuration information of the UE sent by the third network device.

A second aspect of the present application provides a communication method, including:

The first network device acquires data transmission status information, where the data transmission status information is used to indicate data transmission status information of the radio link control protocol stack and/or the medium access control protocol stack in the first network device; the first network device sends Data transfer status information. Thereby, the second network device is made to have the same data transmission state information between the first network device and the UE as the first network device, and the second network device can perform data transmission with the UE according to the data transmission state information. In this process, the UE has no perception and improves the continuity of data transmission.

In a possible design, the first network device sends data transmission status information, including:

The first network device sends data transmission status information to the second network device.

The first network device sends the data transmission status information to the second network device through the third network device.

In a possible design, before the first network device sends the data transmission status information to the second network device by using the third network device, the method further includes:

The first network device receives the data transmission status report indication information sent by the third network device.

In one possible design, it also includes:

The first network device sends the transmission resource information to the user equipment UE, where the transmission resource information includes the port number and/or the uplink transmission resource information, and is used to indicate that the UE performs the port and/or the uplink transmission resource information corresponding to the port number with the second network device. data transmission.

In one possible design, it also includes:

The first network device sends a timer suspension indication information to the UE, and the timer suspension indication information is used to instruct the UE to suspend its data transmission timer.

In a possible design, the timer suspension indication information further includes a port number for instructing the UE to listen to the port corresponding to the port number, and restarting the timer after the port receives the data unit.

In one possible design, it also includes:

The first network device receives the link release indication information, where the link release indication information is used to instruct the first network device to delete the configuration information and/or the data transmission status information of the UE.

In a possible design, the first network device receives the link release indication information, including:

Receiving, by the first network device, link release indication information sent by the second network device;

or,

The first network device receives the link release indication information sent by the third network device.

The third aspect of the present application provides a network device, including:

The network device provides an air interface for the user equipment UE, and the network device can interact with other network devices, where the network device includes a processor, a memory, and a communication port, and the processor, the memory, and the communication port are all connected through a bus; the memory storage computer executes instructions; The computer executing the memory storage executes instructions to cause the network device to perform data interaction with the other network device and the UE through the communication port to perform the communication method in any one of the above aspects or the first aspect.

A fourth aspect of the present application provides a network device, including:

The network device provides an air interface for the user equipment UE, and the network device can interact with other network devices, where the network device includes a processor, a memory, and a communication port, and the processor, the memory, and the communication port are all connected through a bus; the memory storage computer executes instructions; The computer executing the memory storage executes instructions to cause the network device to perform data interaction with the other network device and the UE through the communication port to perform the communication method in any of the possible aspects of the second aspect or the second aspect.

DRAWINGS

FIG. 1 is a schematic diagram of a scenario provided by the present application;

2 is a schematic diagram of another scenario provided by the present application;

FIG. 3 is a schematic diagram of still another scenario provided by the present application;

4 is a schematic diagram of still another scenario provided by the present application;

FIG. 5 is a schematic flowchart diagram of a communication method provided by the present application;

FIG. 6 is a schematic flowchart diagram of another communication method provided by the present application;

FIG. 7 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 8 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 9 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 10 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 11 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 12 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 13 is a schematic flowchart diagram of still another communication method provided by the present application;

FIG. 14 is a schematic structural diagram of a network device provided by the present application;

FIG. 15 is a schematic structural diagram of a network device provided by the present application.

detailed description

The terms "first", "second", "third", "fourth", etc. (if present) in the specification and claims of the present application and the above figures are used to distinguish similar objects without having to use To describe a specific order or order. It is to be understood that the data so used may be interchanged as appropriate, such that the application described herein can be implemented, for example, in a sequence other than those illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices. The term “and/or” in the present application is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B.

It should be understood that the technical solution of the present application can be applied to various communication systems, for example, a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, advanced long-term evolution (Advanced long term evolution, LTE-A for short) system, Universal Mobile Telecommunication System (UMTS) or 5G.

It should also be understood that in the present application, user equipment (User Equipment, UE for short) includes but is not limited to a mobile station (Mobile Station, MS: Mobile Terminal), a mobile terminal (Mobile Telephone), a mobile phone ( The handset device can communicate with one or more core networks via a Radio Access Network (RAN). For example, the user device can be a mobile phone (or "cellular" phone) or a computer with wireless communication capabilities, etc., and the user device can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.

It should be understood that the specific type of the network device is not limited, for example, it may be a common base station (such as a NodeB or an eNB), may be a radio remote module, may be a pico, or may be a relay. It can be a centralized network element (Centralized Unit (CU), which can be a distributed network unit (DU), and can be a transmission point (Tra nsmission Point, TP for short) or a transmission receiving point (Transmission). Reception Point (TRP), which can be DU and TP, or any other wireless access device. In this application, the network device may have a Radio Resource Control (RRC) protocol stack function and/or all or part of a Layer 2 protocol stack function, or the network device may have an RRC protocol stack function and/or all or part of layer 2 Protocol stack and physical layer protocol stack functions. The function of the Layer 2 protocol stack may include at least one of a function in a Packet Data Convergence Protocol (PDCP), an RLC, and a MAC. That is, the layer two protocol stack may be one of PDCP, or RLC, or MAC, or PDCP and RLC, or PDCP and MAC, or RLC and MAC, or PDCP and RLC and MAC. For example, the CU is a network device having RRC and/or PDCP functions, the DU is a network device having at least an RLC/MAC protocol stack function, and the base station is a network device having an RRC, PDCP, RLC, MAC, and/or PHY protocol stack function; The CU, DU, and base station are just an exemplary name and are not limited to this name.

In the present application, the network device is CU or DU as an example, and is not limited to this.

FIG. 1 is a schematic diagram of a scenario provided by the present application. As shown in FIG. 1 , the scenario includes a CU, a DU, and a TRP. FIG. 1 shows two DUs, which are respectively DU1 and DU2, and the CU manages DU1 and DU2. Each DU manages multiple TRPs. In FIG. 1, three DUs are managed by each DU as an example, and each TRP has multiple beams.

FIG. 2 is a schematic diagram of another scenario provided by the present application. As shown in FIG. 2 , the scenario shown in FIG. 2 includes two CUs, namely, CU1 and CU2, where CU1 manages DU1. , CU2 manages DU2.

FIG. 3 is a schematic diagram of still another scenario provided by the present application. As shown in FIG. 3, FIG. 3 is based on the embodiment shown in FIG. 1. The function of the CU and the function of the DU1 are deployed in the same network device (such as a base station). .

4 is a schematic diagram of still another scenario provided by the present application. As shown in FIG. 4, FIG. 4 is based on the embodiment shown in FIG. 2, and the function of the CU1 and the function of the DU1 are deployed in the same network device, such as the base station 1. The function of CU2 and the function of DU2 are deployed in the same network device, such as base station 2.

The technical solution will be described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

FIG. 5 is a schematic flowchart of a communication method provided by the present application. As shown in FIG. 5, the embodiment is applied to the scenario shown in FIG. 1. In this implementation, the first network device uses the DU1 as an example, and the second network device Taking DU2 as an example, the third network device takes the CU as an example. The method in this embodiment is as follows:

S500: The CU determines to switch from DU1 to DU2 according to the measurement report, or determines to migrate the bearer under the DU1 to the DU2.

The bearer of the DU1 is migrated to the DU2, and the part of the bearer under the DU1 is migrated to the DU2.

Among them, a possible implementation:

The UE measures the channel quality between DU1 and DU2 and obtains a measurement report. Report the measurement report to the CU. The CU determines whether the UE switches from DU1 to DU2 according to the measurement report, or determines whether to migrate the bearer under DU1 to DU2. If it is determined to switch from DU1 to DU2, or it is determined to migrate the bearer under DU1 to DU2, then S502 is performed.

Another possible implementation:

DU1 and DU2 measure the channel quality with the UE, respectively, and obtain a measurement report. DU1 and DU2 report the measurement report to the CU. The CU determines whether the UE switches from DU1 to DU2 according to the measurement report, or determines whether to migrate the bearer under DU1 to DU2. If it is determined to switch from DU1 to DU2, or it is determined to migrate the bearer under DU1 to DU2, then S502 is performed.

S502: The CU sends a data transmission status report indication information to the DU1.

The data transmission status reporting indication information is used to indicate that the data transmission status between the UE and the UE is reported by the DU1.

Optionally, the data transmission status information is used to indicate data transmission status information of the radio link control and/or the medium access control protocol stack in the DU1. The data transmission status information includes, but is not limited to, at least one of the following: information of a data unit in which the DU1 has transmitted but not received feedback information of the UE to the UE; and information of the data unit that the DU1 has not transmitted to the UE. The data unit is a Protocol Data Unit (PDU) or a Service Data Unit (SDU).

Optionally, the information of the data unit that the DU1 does not send to the UE includes, but is not limited to, sequence information of the untransmitted data unit.

Optionally, the information of the data unit that the DU1 sends to the UE but does not receive the feedback information of the UE includes, but is not limited to, at least one of the following: sequence information of the data unit that has not received the feedback information that has been sent, and data transmission timing Time information of the Hybrid Automatic Repeat Request (HARQ) process, the data unit transmission confirmation information of the HARQ process, the acknowledgement information of the data unit, the maximum transmission state variable, the maximum reception state variable, and the transmission state variable , receive state variables and transfer windows.

Optionally, the data transmission timer may be a reordering timer of the RLC or the MAC, or may be a HARQ Round Trip Time (RTT) timer.

S504: The DU1 sends data transmission status information to the CU.

Thereby, the CU is made to obtain data transmission status information between the DU1 and the UE.

S506: The CU sends the foregoing data transmission status information to the DU2.

Thereby, the DU2 is made to obtain the data transmission status information between the DU1 and the UE.

S508: The CU sends configuration information of the UE to the DU2.

The configuration information of the UE includes at least one of the following configuration parameters: a control plane configuration parameter; and a user plane configuration parameter.

The control plane configuration parameter includes configuration parameters of a function of the RRC protocol stack; the user plane configuration parameter includes at least one of configuration parameters of a function of a protocol stack such as PDCP, RLC, and MAC.

Optionally, the execution order of S508 and S502-S506 is not limited, and S508 may be performed before S502-S506, may be performed after S502-S506, or may be performed between any two steps S502-S506, Therefore, the application is not limited.

S510: The DU2 establishes a control plane entity and/or a user plane entity of the UE according to the data transmission state information and/or the configuration information of the UE.

S512: The CU sends, to the DU2, a data unit that has not received the feedback information that has been sent by the DU1 and/or an untransmitted data unit.

S514: The DU2 performs data transmission with the UE.

The DU2 transmits to the UE the data unit that has not received the feedback information that has been sent by the above DU1 and/or the untransmitted data unit.

In this embodiment, the CU sends a data transmission status report indication information to the DU1, and instructs the DU1 to report the data transmission status information between the UE and the UE. The CU sends the configuration information of the UE to the DU2 and the data transmission status information reported by the DU1 and the UE. Thereby, the DU2 is made to obtain the same configuration information of the UE as the DU1 and the data transmission status information between the DU1 and the UE. The DU2 performs data transmission with the UE according to the configuration information of the UE and the data transmission status information between the DU1 and the UE. Therefore, the UE is switched from the DU1 to the DU2, or the UE's bearer under the DU1 is migrated to the DU2, and the UE is not aware in the process, thereby improving the continuity of data transmission.

It is to be understood that the network device may perform some or all of the steps in the above embodiments, and the steps or operations are merely examples, and the present application may also perform other operations or variations of various operations. Further, the various steps may be performed in a different order as presented in the above embodiments, and it is possible that not all of the operations in the above embodiments are performed.

FIG. 6 is a schematic flowchart of another communication method provided by the present application. FIG. 6 is based on the method embodiment shown in FIG. 5, and further includes:

S516: The DU2 sends an acknowledgement message to the CU.

The confirmation message is used to indicate that the connection establishment of the DU2 and the UE is successful.

The methods for determining that the connection between the DU2 and the UE is successfully established include, but are not limited to, the following possible implementation manners:

One possible implementation is:

The CU sends the transmission resource information between the UE and the DU2 to the DU1. The DU1 sends the transmission resource information and/or the status report indication information to the UE, where the transmission resource information includes the port number and/or the uplink transmission resource information, and is used to indicate that the UE sends the resource information through the port corresponding to the port number and/or the uplink. The data transmission is performed by the DU2, and the status indication information is used to indicate that the UE reports the feedback information of the data unit sent by the received DU1 according to the transmission resource information. After receiving the transmission resource information, the UE sends feedback information of the data unit transmitted by the DU1 but not sent, the feedback information sent to the DU1 last time, and/or the feedback information of the data unit sent by the subsequent DU2 through the port number. The port and/or uplink transmission resource information is sent to the DU2. After receiving the feedback information sent by the UE, the DU2 determines that the connection between the DU2 and the UE is successfully established. In this possible implementation, S516 is performed after S510.

Another possible implementation is:

The CU sends to the DU2 a data unit in which the DU1 does not receive the feedback information of the UE and/or a data unit in which the DU1 is not transmitted to the UE. The DU2 sends the foregoing data unit to the UE. After receiving the data unit, the UE sends feedback information to the DU2. The DU2 receives the feedback information sent by the UE, and determines that the connection between the DU2 and the UE is successfully established. In this possible implementation, S516 is performed after S514.

S518: The CU sends a link release indication information to the DU1.

The link release indication information is used to instruct the DU1 to delete configuration information and/or data transmission status information of the UE.

S520: The DU1 deletes configuration information and/or data transmission status information of the UE.

In this embodiment, the CU sends an acknowledgment message to the CU, so that the CU learns that the connection between the UE and the UE is successfully established, thereby instructing the DU1 to delete the configuration information and/or the data transmission status information of the UE.

FIG. 7 is a schematic flowchart of still another communication method provided by the present application. FIG. 7 is based on the method embodiment shown in FIG. 5 or FIG. 6 , and further includes S 522.

S522: The DU1 sends a timer suspension indication message to the UE.

The timer suspension indication information is used to instruct the UE to suspend its data transmission timer.

Optionally, the data transmission timer may be a reordering timer of the RLC or the MAC, or may be a HARQ RTT timer.

Optionally, the timer suspension indication information may further include a port number, configured to instruct the UE to listen to the port corresponding to the port number, and restart the timer after the port receives the data.

The execution sequence of S522 is performed after S502, and the application is not limited thereto.

In this embodiment, the timer suspension indication information is sent to the UE through the DU1, so that the UE suspends its data transmission timer.

8 is a schematic flowchart of still another communication method provided by the present application. FIG. 8 is different from FIG. 5 to FIG. 7 in that, in any of the embodiments shown in FIG. 5 to FIG. 7, the data transmission state is sent to the CU through the DU1. Information, the CU then forwards the data transmission status information to the DU2, so that the DU2 obtains the data transmission status information. In the embodiment shown in FIG. 7, the data transmission status information is directly transmitted to the DU2 through the DU1 so that the DU2 obtains the data transmission status information. That is, S504 and S506 in Figs. 5 to 7 are replaced by S504' in Fig. 7, and S504': DU1 transmits data transmission state information to DU2.

FIG. 9 is a schematic flowchart of still another communication method provided by the present application. FIG. 9 is applied to the scenario shown in FIG. 2, and FIG. 9 is different from the embodiment shown in FIG. 5 to FIG. 8. The CU is equivalent to the CU1 in FIG. The communication between the CU and the DU2 is forwarded through the CU2. The remaining steps are similar, as described in detail in FIG. 5 to FIG. 8 , and details are not described herein again.

10 is a schematic flowchart of still another communication method provided by the present application. FIG. 10 is applied to the embodiment shown in FIG. 3 or the scenario shown in FIG. 4, and the flow is as follows:

S1000: The first network device determines to switch from the first network device to the second network device according to the measurement report, or determines to migrate the bearer under the first network device to the second network device.

The bearer of the first network device is migrated to the second network device. It can be understood that part of the bearer under the first network device is migrated to the second network device.

Among them, a possible implementation:

The UE measures channel quality with the first network device and the second network device, and obtains a measurement report. The measurement report is reported to the first network device. The first network device determines, according to the measurement report, whether the UE switches from the first network device to the second network device, or determines to migrate the bearer under the first network device to the second network device. If yes, execute S1002.

Another possible implementation:

The first network device and the second network device respectively measure channel quality with the UE, and obtain a measurement report. The second network device will report the measurement report to the first network device. The first network device determines, according to the measurement report, whether the UE switches from the first network device to the second network device, or determines to migrate the bearer under the first network device to the second network device. If it is determined to switch from the first network device to the second network device, or to determine to migrate the bearer under the first network device to the second network device, then perform S1002.

S1002: The first network device sends the foregoing data transmission status information to the second network device.

Thereby, the second network device is caused to obtain data transmission status information between the first network device and the UE.

Optionally, the data transmission status information may be used to indicate data transmission status information of the radio link control and/or the medium access control protocol stack in the first network device.

The data transmission status information includes, but is not limited to, at least one of the following: information that the first network device sends to the UE but does not receive the feedback information of the UE; the data unit that is not sent by the first network device to the UE information. The data unit is a PDU or an SDU.

Optionally, the information that the first network device does not send to the data unit of the UE includes, but is not limited to, sequence information of the untransmitted data unit.

Optionally, the information of the data unit that the first network device sends to the UE but does not receive the feedback information of the UE includes, but is not limited to, at least one of the following: sequence information of the data unit that has not received the feedback information that has been sent, The data transmission timer, the time information of the HARQ process, the data unit transmission confirmation information of the HARQ process, the acknowledgement information of the data unit, the maximum transmission state variable, the maximum reception state variable, the transmission state variable, the reception state variable, and the transmission window.

S1004: The first network device sends configuration information of the UE to the second network device.

The configuration information of the UE includes at least one of the following configuration parameters: a control plane configuration parameter and a user plane configuration parameter.

The control plane configuration parameter includes a configuration parameter of a function of the RRC protocol stack; the user control plane configuration parameter includes a configuration parameter of a function of the RRC protocol stack; and the user plane configuration parameter includes a protocol stack such as a PDCP, an RLC, and a MAC. At least one of the configuration parameters of the function.

S1006: The second network device establishes a control plane entity and/or a user plane entity of the UE according to the data transmission state information and/or the configuration information of the UE.

S1008: The first network device sends, to the second network device, a data unit that has not received the feedback information that has been sent by the first network device, and/or an untransmitted data unit.

S1010: The second network device performs data transmission with the UE.

The second network device sends, to the UE, the data unit that has not received the feedback information that has been sent by the first network device, and/or the untransmitted data unit.

In this embodiment, the first network device sends the data transmission status information and/or the configuration information of the UE to the second network device, so that the second network device obtains the configuration information of the UE and the first network that are the same as the first network device. Data transmission status information between the device and the UE. The second network device performs data transmission with the UE according to the configuration information of the UE and/or the data transmission status information between the first network device and the UE. Thereby, the UE is switched from the first network device to the second network device, or the bearer of the UE under the first network device is migrated to the second network device, and in the process, the UE is not aware, and the continuity of data transmission is improved.

FIG. 11 is a schematic flowchart of still another communication method provided by the present application. FIG. 11 is based on the method embodiment shown in FIG. 10, and further includes:

S1012: The second network device sends the acknowledgement information to the first network device.

The confirmation message is used to indicate that the connection between the second network device and the UE is successfully established.

One possible implementation is:

The first network device sends the transmission resource information and/or the status report indication information to the UE, where the transmission resource information includes the port number and/or the uplink transmission resource information, and is used to indicate that the UE sends the port corresponding to the port number and/or the uplink. The resource information is transmitted with the second network device, where the status report indication information is used to instruct the UE to report the feedback information of the data unit sent by the first network device that has been received according to the transmission resource information. After receiving the transmission resource information, the UE sends the unsent feedback information of the data unit sent by the first network device that has been received or the feedback information sent to the first network device last time, and/or the data sent by the subsequent second network device. The feedback information of the unit is sent to the second network device by using the port corresponding to the port number and/or the uplink sending resource information. After receiving the feedback information sent by the UE, the second network device determines that the connection between the second network device and the UE is successfully established.

Another possible implementation is:

The first network device sends, to the second network device, a data unit that does not receive the feedback information of the UE by the first network device and/or a data unit that is not sent by the first network device to the UE. The second network device sends the foregoing data unit to the UE. After receiving the data unit, the UE sends feedback information to the second network device, and the second network device receives the feedback information sent by the UE, and determines that the second network device and the UE are successfully established. .

S1014: The second network device sends link release indication information to the first network device.

The link release indication information is used to instruct the first network device to delete configuration information and/or data transmission status information of the UE.

S1016: The first network device deletes configuration information and/or data transmission status information of the UE.

In this embodiment, the second network device sends the acknowledgement information to the first network device to indicate that the second network device and the UE are successfully established, and the second network device sends the link release indication information to the first network device to indicate the first The network device deletes configuration information and/or data transmission status information of the UE.

FIG. 12 is a schematic flowchart of still another communication method provided by the present application. FIG. 12 is based on the method embodiment shown in FIG. 10 or FIG. 11 , and further includes S1018, which is illustrated by FIG. 10 .

S1018: The first network device sends a timer suspension indication message to the UE.

Optionally, the data transmission timer may be a reordering timer of the RLC or the MAC, or may be a HARQ RTT timer. Optionally, the timer suspension indication information may further include a port number, configured to instruct the UE to listen to the port corresponding to the port number, and restart the timer after the port receives the data.

The execution order of S1018 is performed after S1012, and the application does not limit this.

In this embodiment, the timer suspension indication information is sent to the UE by the first network device, so that the UE suspends its data transmission timer.

FIG. 13 is a schematic flowchart of still another communication method provided by the present application. FIG. 13 is applied to a scenario of multiple connections. The steps in this embodiment are as follows:

S1301: The CU acquires data transmission status information sent by the DU1.

Among them, one possible implementation is:

The DU1 periodically feeds back the data transmission status information to the CU. Therefore, the CU can periodically acquire the data transmission status information of the DU1.

Another possible implementation is:

The CU performs a handover decision to determine to increase the data transmission between the DU2 and the UE, and then sends a data transmission status report indication indication to the DU1, and the CU receives the data transmission status information sent by the DU1.

Another possible implementation is:

The CU determines to increase the data transmission between the DU2 and the UE according to the measurement report, and sends a data transmission status report indication indication to the DU1, and the CU receives the data transmission status information sent by the DU1.

S1302: The CU configures configuration information of the UE for the DU2.

The CU can be configured to configure the configuration information of the UE by using the RRC message.

Optionally, the UE configuration information configured by the CU in the DU2 may be the same as or different from the UE configuration information configured in the DU1.

The execution order of S1101 and S1102 is not limited.

S1303: The CU sends configuration information to the UE.

The CU may send configuration information of the UE by using an RRC message.

Further, the configuration information may include transmission resource information configured to the UE.

The transmission resource information includes a port number, and is used to instruct the UE to receive data sent by the DU2 corresponding to the port number. DU2 and DU1 can transmit different Channel State Information-Reference Signals (CSI-RS) or other port signals for the UE to distinguish data of different ports.

S1304: The UE establishes a layer 2 or layer 1 entity corresponding to the port number according to the configuration information, and performs data transmission on the port corresponding to the port number.

Optionally, in the foregoing embodiment, when the CU selects the TRP of the DU2, the timing between the TRPs is preferentially less than one CP. Therefore, after the UE receives the layer 2 or layer 1 parameters, the default UE and the TRP of the DU2 are The Time Advanced (TA) is 0 or the same as TA1 between the UE and the TPR of the DU1, and the acquisition process of the TA is not required.

FIG. 14 is a schematic structural diagram of a network device provided by the present application. As shown in FIG. 14, the network device 1400 includes: a processor 1401, a memory 1402, and a communication port 1403. The communication port may be a receiver or a transmitter.

The network device 1400 provides an air interface for the UE, and the network device 1400 can interact with other network devices. The network device 1400 includes a processor 1401, a memory 1402, and a communication port 1403. The processor 1401, the memory 1402, and the communication port 1403 all pass through the bus. The storage 1402 stores the computer execution instructions; the processor 1403 executes the memory stored computer execution instructions, so that the network device performs data interaction with the other network devices and the UE through the communication port 1403 to perform any of the above-mentioned FIGS. The communication method of the embodiment.

15 is a schematic structural diagram of a network device provided by the present application. As shown in FIG. 15, the network device 1500 includes: a processor 1501, a memory 1502, and a communication port 1503. The communication port may be a receiver or a transmitter.

The network device 1500 provides an air interface for the UE, and the network device 1500 can interact with other network devices. The network device 1500 includes a processor 1501, a memory 1502, and a communication port 1503. The processor 1501, the memory 1502, and the communication port 1503 all pass through the bus. Connected; the memory 1502 stores computer execution instructions; the processor 1503 executes the memory stored computer execution instructions to cause the network device to perform data interaction with other network devices and the UE through the communication port 1503 to perform any of the above-described FIGS. The communication method of the embodiment.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A communication method, comprising:

The second network device receives the data transmission status information, where the data transmission status information is used to indicate data transmission status information of the radio link control protocol stack and/or the medium access control protocol stack in the first network device;

The second network device performs data transmission with the UE according to the data transmission status information.
The method according to claim 1, wherein the data transmission status information comprises information of data units that have not been received by the first network device and/or information of untransmitted data units.
The method according to claim 2, wherein the information of the untransmitted data unit comprises: sequence information of the untransmitted data unit;

The information of the transmitted data unit that does not receive the feedback information includes at least one of the following: sequence information of the transmitted data unit that has not received the feedback information, a data transmission timer, and a hybrid automatic repeat request HARQ Time information of the process, data unit transmission confirmation information of the HARQ process, acknowledgement information of the data unit, maximum transmission state variable, maximum reception state variable, transmission state variable, reception state variable, and transmission window.
The method according to claim 2 or 3, further comprising:

The second network device receives the configuration information of the UE, and the configuration information of the UE includes at least one of the following configuration parameters:

Control plane configuration parameters;

User plane configuration parameters.
The method of any of claims 2-4, further comprising:

The second network device receives a data unit that has not received feedback information that has been sent by the first network device, and/or an untransmitted data unit.
The method according to claim 5, wherein the receiving the data unit that has not received the feedback information that has been sent by the first network device and/or the unsent data unit comprises:

Receiving, by the second network device, a data unit that is sent by the first network device and that is not received by the first network device, and/or a data unit that is not sent;

or,

The second network device receives a data unit that is sent by the first network device and has not received feedback information and/or an untransmitted data unit that is sent by the first network device.
The method of any of claims 1-6, further comprising:

The second network device sends an acknowledgment message, where the acknowledgment message is used to indicate that the second network device and the UE are successfully established.
The method according to claim 7, wherein the second network device sends the confirmation information, including:

Sending, by the second network device, the acknowledgement information to the first network device;
The method according to claim 7, wherein the second network device sends the confirmation information, including:

The second network device sends the confirmation information to the third network device.
The method according to claim 8, wherein after the second network device sends the confirmation information to the first network device, the method further includes:

The second network device sends link release indication information to the first network device, where the link release indication information is used to instruct the first network device to delete configuration information of the UE and/or the data transmission. status information.
The method according to any one of claims 1-10, wherein the receiving, by the second network device, data transmission status information comprises:

Receiving, by the second network device, the data transmission status information sent by the first network device;

or,

Receiving, by the second network device, the data transmission state information that is sent by the first network device by using the third network device;

or,

The second network device receives the data transmission status information sent by the UE.
The method according to claim 4, wherein the receiving, by the second network device, the configuration information of the UE comprises:

Receiving, by the second network device, configuration information of the UE that is sent by the first network device;

or,

Receiving, by the second network device, configuration information of the UE that is sent by the first network device by using a third network device;

or,

The second network device receives configuration information of the UE that is sent by the third network device.
A communication method, comprising:

The first network device acquires data transmission status information, where the data transmission status information is used to indicate data transmission status information of the radio link control protocol stack and/or the medium access control protocol stack in the first network device;

The first network device sends the data transmission status information.
The method according to claim 13, wherein the data transmission status information comprises information of a data unit that has not received feedback information that has been transmitted by the first network device and/or information of an untransmitted data unit.
The method according to claim 14, wherein the information of the untransmitted data unit comprises: sequence information of the untransmitted data unit;

The information of the transmitted data unit that does not receive the feedback information includes at least one of the following: sequence information of the transmitted data unit that has not received the feedback information, a data transmission timer, and a hybrid automatic repeat request HARQ Time information of the process, data unit transmission confirmation information of the HARQ process, acknowledgement information of the data unit, maximum transmission state variable, maximum reception state variable, transmission state variable, reception state variable, and transmission window.
The method according to claim 13, wherein the transmitting, by the first network device, the data transmission status information comprises:

The first network device sends the data transmission status information to the second network device.
The method according to claim 13, wherein the transmitting, by the first network device, the data transmission status information comprises:

The first network device sends the data transmission status information to the second network device by using the third network device.
The method according to claim 17, wherein before the sending, by the third network device, the data transmission status information to the second network device, the first network device further includes:

The first network device receives the data transmission status report indication information sent by the third network device.
The method of any of claims 13-18, further comprising:

The first network device sends the transmission resource information to the user equipment UE, where the transmission resource information includes a port number and/or uplink transmission resource information, and is used to indicate that the UE passes the port corresponding to the port number and/or the The uplink sending resource information and the second network device perform data transmission.
The method of claim 19, further comprising:

The first network device sends a timer suspension indication information to the UE, where the timer suspension indication information is used to instruct the UE to suspend its data transmission timer.
The method according to claim 20, wherein the timer suspension indication information further includes a port number, configured to instruct the UE to listen to a port corresponding to the port number, and receive a data unit at the port. Then restart the timer.
The method according to any one of claims 13 to 21, further comprising:

The first network device receives the link release indication information, where the link release indication information is used to instruct the first network device to delete the configuration information of the UE and/or the data transmission state information.
The method according to claim 22, wherein the receiving, by the first network device, the link release indication information comprises:

Receiving, by the first network device, the link release indication information sent by the second network device;

or,

The first network device receives the link release indication information sent by the third network device.
A network device, comprising:

The network device provides an air interface for the user equipment UE, and the network device can interact with other network devices, the network device includes a processor, a memory, and a communication port, the processor, the memory, and the communication port All being connected by a bus; the memory storing computer executing instructions; the processor executing the computer-executed instructions stored by the memory, such that the network device performs data interaction with other network devices and UEs through the communication port The communication method according to any one of claims 1 to 12.
A network device, comprising:

The network device provides an air interface for the user equipment UE, and the network device can interact with other network devices, the network device includes a processor, a memory, and a communication port, the processor, the memory, and the communication port All being connected by a bus; the memory storing computer executing instructions; the processor executing the computer-executed instructions stored by the memory, such that the network device performs data interaction with other network devices and UEs through the communication port The communication method according to any one of claims 13 to 23.