Communication method and device and storage medium

Abstract

The embodiment of the invention provides a communication method and device and a storage medium, relates to the technical field of communication, and is used for realizing reestablishment of a base station and a terminal in an inactive state. The method comprises the following steps: receiving a radio resource control (RRC) reestablishment request message sent by a terminal, and determining a network side state of the terminal; and under the condition of determining that the network side state of the terminal is an inactive state, in response to the RRC reestablishment request message, sending an RRC reconfiguration message to the terminal, the RRC reconfiguration message comprising a full configuration parameter, and the full configuration parameter being used for indicating reestablishment of the packet data convergence protocol connection.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method, device and storage medium. Background Art

[0002] In the business to business (ToB) service scenario, the inactivation detection mechanism of the base station enables the air interface wireless resources of the terminal (user equipment, UE) that has no data service for a certain period of time to be quickly released, allowing the base station to quickly rotate the limited air interface wireless resources among a large number of users and make efficient use of them.

[0003] When the base station and the terminal have inconsistent cognition of the current state of the terminal during the inactive state interaction, for example, the base station recognizes that the terminal is in the inactive state, while the terminal recognizes itself as being in the connected state, the terminal will trigger the re-establishment process. The current protocol does not support re-establishment in the inactive state. Summary of the invention

[0004] The present application provides a communication method for realizing re-establishment of a base station and a terminal in an inactive state.

[0005] In order to achieve the above purpose, this application adopts the following technical solutions:

[0006] In a first aspect, a communication method is provided, the method being applied to a first base station, the method comprising:

[0007] receiving a radio resource control (RRC) re-establishment request message sent by a terminal, and determining a network side state of the terminal;

[0008] When it is determined that the network side state of the terminal is in an inactive state, in response to the RRC re-establishment request message, an RRC reconfiguration message is sent to the terminal, the RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate the re-establishment of a packet data convergence protocol (PDCP) connection.

[0009] In a second aspect, a communication method is provided, the method being applied to a terminal, the method comprising:

[0010] Sending an RRC re-establishment request message to the first base station;

[0011] An RRC reconfiguration message sent by the first base station is received; when the network side state of the terminal is an inactive state, the RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate re-establishment of a packet data convergence protocol connection.

[0012] In a third aspect, a communication device is provided, where the device is applied to a first base station, and the device includes:

[0013] A receiving unit, configured to receive a radio resource control RRC re-establishment request message sent by a terminal and determine a network side state of the terminal;

[0014] The sending unit is used to send an RRC reconfiguration message to the terminal in response to an RRC reestablishment request message when determining that the network side state of the terminal is an inactive state. The RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate the reestablishment of the packet data convergence protocol connection.

[0015] In a fourth aspect, a communication device is provided, the device being applied to a terminal, the device comprising:

[0016] A sending unit, configured to send an RRC re-establishment request message to the first base station;

[0017] The receiving unit is used to receive an RRC reconfiguration message sent by the first base station; when the network side state of the terminal is in an inactive state, the RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate re-establishment of a packet data convergence protocol connection.

[0018] In a fifth aspect, a communication device is provided, comprising: a processor and a memory; the memory stores instructions executable by the processor; when the processor is configured to execute the instructions, the communication device implements the method provided in any one of the first aspect or the second aspect above.

[0019] In a sixth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer executes the method provided in either the first aspect or the second aspect.

[0020] In a seventh aspect, a computer program product comprising computer instructions is provided. When the computer instructions are executed on a computer, the computer executes the method provided in any one of the first aspect or the second aspect.

[0021] In an embodiment of the present application, when it is determined that the network side state of the terminal is in an inactive state, that is, when the first base station recognizes that the terminal is in an inactive state, the RRC reconfiguration message sent by the first base station to the terminal includes full configuration parameters to indicate the re-establishment of the packet data convergence protocol connection, so that the packet data convergence protocol sequence number (PDCP sequence number, PDCP SN) between the first base station and the terminal is consistent, thereby facilitating the re-establishment of the first base station and the terminal in the inactive state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0023] Figure 1 A schematic diagram of a process of releasing physical resources of an existing base station provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0025] Figure 3 A flow chart of a communication method provided in an embodiment of the present application;

[0026] Figure 4 A flowchart of another communication method provided in an embodiment of the present application;

[0027] Figure 5 A schematic diagram of a flow chart of re-establishment in an existing base station provided in an embodiment of the present application;

[0028] Figure 6 A flowchart of another communication method provided in an embodiment of the present application;

[0029] Figure 7 A schematic diagram of the overall process of re-establishment in an inactive state provided in an embodiment of the present application;

[0030] Figure 8 A flowchart of another communication method provided in an embodiment of the present application;

[0031] Fig. 9 A schematic diagram of an existing cross-base station re-establishment process provided in an embodiment of the present application;

[0032] Fig.10 A flowchart of another communication method provided in an embodiment of the present application;

[0033] Fig.11 A flowchart of another communication method provided in an embodiment of the present application;

[0034] Fig.12 A schematic diagram of the overall process of re-establishing across base stations in an inactive state provided in an embodiment of the present application;

[0035] Fig.13 A flowchart of another communication method provided in an embodiment of the present application;

[0036] Fig.14 A schematic diagram of the composition of a communication device provided in an embodiment of the present application;

[0037] Fig.15 A schematic diagram of another communication device provided in an embodiment of the present application;

[0038] Fig.16 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0043] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0044] When the base station detects that the terminal connected to the base station has no data service within a certain period of time, the base station will notify the terminal to enter the inactive state by sending an RRC Release message (RRC Release) to the terminal. However, when the wireless link is poor, the base station sends an RRC Release message, and the terminal fails to successfully receive the RRC Release message, then the base station recognizes that the terminal has entered the inactive state, and the base station immediately releases the physical resources of the distributed unit (DU) of the base station; while the terminal does not receive the RRC Release message, it recognizes that it is still in the connected state. When the terminal and the base station have inconsistent cognition of the current state of the terminal, when the terminal has uplink service, it continues to send uplink data in the connected state mode, and re-establishment will occur. At this time, the base station recognizes that the terminal is in the inactive state, and according to the current protocol, re-establishment cannot be achieved.

[0045] The following is a description of the process of releasing physical resources by a base station in conjunction with the accompanying drawings. Here, the base station is taken as an example of a next generation base station (the next generation node B, gNB). Figure 1 As shown, a schematic diagram of a process of releasing physical resources of an existing base station provided in an embodiment of the present application is provided. The gNB includes a centralized unit (central unit, CU) and a distributed unit DU, wherein the gNB-CU includes a gNB-CU control unit control panel (gNB-CU-control plane, gNB-CU-CP) and a gNB-CU control unit user panel (gNB-CU-user plane, gNB-CU-UP).

[0046] First, the gNB-CU-CP sends a bearer context setup request to the gNB-CU-UP, which includes an inactivity timer (BEARER CONTEXT SETUP REQUEST (inactivity timer)).

[0047] After receiving the bearer context setup request, the gNB-CU-UP sends a bearer context setup response (BEARER CONTEXT SETUP RESPONSE) to the gNB-CU-CP.

[0048] The gNB-CU-UP then sends a BEARER CONTEXTINACTIVITY NOTIFICATION to the gNB-CU-CP.

[0049] After receiving the BCR Inactive Indication, the gNB-CU-CP decides to change the UE state to RRC-inactive. The gNB-CU-CP sends a BEARERCONTEXT MODIFICATION REQUEST (with suspend indication) to the gNB-CU-UP.

[0050] The gNB-CU-UP sends a BEARER CONTEXT MODIFICATION RESPONSE (report PDCP status for eg, data reporting) to the gNB-CU-CP. The BEARER CONTEXT MODIFICATION RESPONSE is used to report PDCP status for eg, data reporting.

[0051] The gNB-CU-CP sends a terminal context release command to the gNB-DU. The terminal context release command includes an RRCRelease message (UE CONTEXT RELEASE COMMAND (with RRC Release)).

[0052] The gNB-DU sends an RRC Release message to the UE, after which the gNB-DU sends a UE CONTEXT RELEASE COMPLETE message to the gNB-CU-CP.

[0053] It should be noted that the above Figure 1 The description is only exemplary. Figure 1 The description of can refer to the description in the related technology and will not be repeated here.

[0054] The current protocol does not support the re-establishment of the base station and the terminal in an inactive state, including the following problems:

[0055] Since the base station has recognized that the terminal is in an inactive state, that is, the network-side state of the terminal is in an inactive state, the wireless dedicated bearer of the terminal has been released, and the PDCP SN of the corresponding wireless dedicated bearer has also been cleared. At this time, the terminal will continue to use the previous PDCP SN according to the protocol. According to the current protocol, the PDCP SN on the base station side and the PDCP SN on the terminal side will not be aligned. If the normal re-establishment process is followed, it will lead to problems such as re-establishment failure or disconnection after re-establishment. Therefore, how to achieve the re-establishment of the base station and the terminal in an inactive state is a technical problem that needs to be solved urgently.

[0056] Based on this, an embodiment of the present application provides a communication method, an apparatus and a storage medium. When it is determined that the network side state of the terminal is in an inactivated state, that is, when the first base station recognizes that the terminal is in an inactivated state, the RRC reconfiguration message sent by the first base station to the terminal includes full configuration parameters to indicate the re-establishment of the packet data convergence protocol connection, so that the PDCP SN between the first base station and the terminal is consistent, thereby facilitating the re-establishment of the first base station and the terminal in the inactivated state.

[0057] The scheme of the embodiment of the present application is introduced below with reference to the accompanying drawings.

[0058] The technical solution provided in the embodiments of the present application can be applied to various mobile communication networks, for example, new radio (NR) mobile communication networks using fifth generation mobile communication technology (5th generation mobile networks, 5G), future mobile communication networks or multiple communication convergence systems, etc., and the embodiments of the present application are not limited to this.

[0059] Figure 2 FIG. 1 is a schematic diagram of a communication system provided in an embodiment of the present application. Figure 2 As shown, the communication system 10 includes multiple base stations (such as base station 21 and base station 22) and a terminal 31. The multiple base stations and the terminal may be connected via a wired network or a wireless network. The wired network or the wireless network may include a router, a switch, or other devices that facilitate communication between the multiple base stations and the terminal, which is not limited in the embodiment of the present application.

[0060] In some embodiments, the base station is used to provide wireless access services for multiple terminals. Specifically, a base station provides a service coverage area (also called a cell). The terminal entering the area can communicate with the base station through wireless signals to receive the wireless access service provided by the base station. For example, the terminal 31 accesses the base station 21 within the service coverage area of ​​the base station 21. After the terminal 31 moves to the service coverage area of ​​the base station 22, it disconnects from the base station 21 and accesses the base station 22. In the case where the terminal 31 moves from the service coverage area of ​​the base station 21 to the service coverage area of ​​the base station 22, the base station 22 can be understood as the current service base station of the terminal 31, and the base station 21 can be understood as the base station that has recently provided services to the terminal.

[0061] In some embodiments, there may be an overlap between the service coverage areas of base station 21 and base station 22, and a terminal in the overlapping area may receive wireless signals from multiple base stations.

[0062] In some embodiments, each of the multiple base stations (eg, base station 11) can be connected to multiple terminals, that is, one base station can provide network services to terminals in one cell, or can provide network services to terminals in multiple cells at the same time.

[0063] In some embodiments, each of the multiple base stations (e.g., base station 11) may be an evolution node B (eNB), a next generation node B (gNB), a transmission receive point (TRP), a transmission point (TP), and any other access node. According to the size of the service coverage area provided, the base station can be divided into a macro base station for providing macro cells (Macro cells), a micro base station for providing micro cells (Pico cells), and a femto base station for providing femto cells (Femto cells). With the continuous evolution of wireless communication technology, future base stations may also adopt other names.

[0064] In some embodiments, the terminal 31 may be a device with wireless transceiver functions, such as a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR) / virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The embodiments of the present invention do not limit the specific types of terminals.

[0065] It should be understood that Figure 2 is an exemplary structural diagram, Figure 2 The communication system shown includes an unlimited number of devices, for example, an unlimited number of base stations and an unlimited number of terminals. Figure 2 In addition to the equipment shown, Figure 2 The communication system shown may also include other devices, which is not limited thereto.

[0066] Next, if Figure 3 As shown, the embodiment of the present application provides a communication method, which is applied to a first base station, and the first base station can be Figure 2 The base station 22 shown in FIG. 1 comprises the following steps:

[0067] S101. Receive an RRC re-establishment request message sent by a terminal, and determine a network side status of the terminal.

[0068] In some embodiments, when the terminal needs to send uplink data, or when the terminal detects a radio link failure (RLF), the terminal sends an RRC re-establishment request message to the first base station to request to re-establish the RRC connection; accordingly, the first base station receives the RRC re-establishment request message sent by the terminal and determines the network side status of the terminal.

[0069] RLF refers to a communication failure of a call channel. When the voice (or data) quality of a mobile station (such as a terminal) deteriorates to an unacceptable level during communication and cannot be improved by radio frequency power or switching (for example, the mobile station leaves the coverage area), the mobile station forcibly disconnects the link or initiates call reestablishment.

[0070] As an example, the first base station determines the network side state of the terminal by attempting to obtain the context information of the terminal from its own database. If the context information of the terminal is not obtained, the network side state of the terminal is determined to be an inactive state. If the context information of the terminal is obtained, the network side state of the terminal is determined to be a connected state.

[0071] It should be understood that when the context information of the terminal is not obtained, it means that the first base station has released the context information of the terminal, so the network side state of the terminal is determined to be inactive. For the description of why the first base station releases the context information of the terminal, please refer to the following description of steps S201-S202, which will not be repeated here.

[0072] S102: When it is determined that the network side state of the terminal is an inactive state, in response to the RRC re-establishment request message, an RRC reconfiguration message is sent to the terminal.

[0073] In some embodiments, when it is determined that the network side state of the terminal is in an inactive state, that is, the first base station recognizes that the terminal is in an inactive state, in response to the RRC re-establishment request message, the RRC reconfiguration message sent by the first base station to the terminal includes a full configuration parameter (Full config), and the full configuration parameter is used to indicate the re-establishment of the packet data convergence protocol connection.

[0074] It should be understood that the network-side state of the terminal refers to the state of the terminal recognized by the base station, and the terminal-side state of the terminal refers to the state recognized by the terminal itself. From the above content, it can be seen that when the base station detects that the terminal has no data service within a certain period of time, the base station will notify the terminal to enter the inactive state by sending an RRC Release message to the terminal. However, when the wireless link is poor, the base station sends an RRC Release message, and the terminal fails to successfully receive the RRC Release message. The base station recognizes that the terminal has entered the inactive state, while the terminal recognizes that it is still in the connected state. That is, the network-side state of the terminal is inactive, and the terminal-side state of the terminal is connected. In this way, the terminal and the base station have inconsistent cognitions of the current state of the terminal.

[0075] In some embodiments, the full configuration parameter may also be called by other names, for example, full reconfiguration indication.

[0076] In some embodiments, the RRC reconfiguration message includes a full configuration parameter whose value is set to true.

[0077] based on Figure 3 In the embodiment shown, it should be understood that when it is determined that the network side state of the terminal is in an inactive state, it means that the first base station has released the context information of the terminal, the wireless dedicated bearer of the terminal has been released, and the PDCP SN of the data message layer of the corresponding wireless dedicated bearer has also been cleared. At this time, re-establishment is performed. Since the terminal will still use the previous PDCPSN for re-establishment, the PDCP SN on the terminal side is inconsistent with the PDCP SN on the first base station side, which may cause problems such as re-establishment failure or disconnection after re-establishment. Based on this, when it is determined that the network side state of the terminal is in an inactive state, the RRC reconfiguration message sent by the first base station to the terminal includes full configuration parameters to instruct the terminal to re-establish the PDCP connection. After sending the RRC reconfiguration message, the first base station will re-count its own PDCP SN from 0. After the terminal receives the RRC reconfiguration message, it determines that the RRC reconfiguration message includes all configuration parameters, and then re-establishes the PDCP connection. At this time, the PDCP SN of the terminal also starts counting from 0. In this way, the PDCP SN on the base station side and the terminal side are consistent, so that the terminal and the first base station will not have problems such as re-establishment failure or disconnection after re-establishment, thereby realizing the re-establishment of the base station and the terminal in an inactive state.

[0078] In some embodiments, the first base station includes a centralized unit (CU) and a distributed unit (DU), such as Figure 4 As shown, before step S101, the method further includes the following steps:

[0079] S201: When no message from a terminal is received within a preset time period, the distributed unit receives a context release indication sent by the centralized unit.

[0080] The context release indication is used to indicate the release of the context information of the terminal. The preset duration may be preset by the protocol or may be pre-configured by a network administrator, and the embodiment of the present application does not limit this.

[0081] It should be understood that when no message is received from the terminal within the preset time period, it means that the terminal has no data service within the preset time period. In order to improve the utilization rate of air interface wireless resources, the centralized unit can send a context release indication to the distributed unit to instruct the distributed unit to release the context information of the terminal, so that the air interface wireless resources occupied by the terminal with no data service within the preset time period can be released, so that the first base station can quickly rotate the limited air interface wireless resources among users, thereby improving the utilization rate of air interface wireless resources.

[0082] In some embodiments, the context release indication includes a terminal identifier, and the terminal identifier is used to uniquely indicate a terminal, for example, it may be a media access control (MAC) address of the terminal, so that the distributed unit releases the context information of the corresponding terminal according to the terminal identifier.

[0083] S202. In response to the context release indication, the distributed unit releases the context information of the terminal and sends an RRC release message to the terminal.

[0084] The RRC release message is used to instruct the terminal to release the RRC connection.

[0085] It should be understood that when the distributed unit releases the context information of the terminal and sends an RRC release message to the terminal, it is to instruct the terminal to release the RRC connection so that the terminal enters an inactive state, so that the first base station and the terminal both recognize that the terminal is in an inactive state, that is, to make the first base station and the terminal have consistent cognition of the current state of the terminal.

[0086] In some embodiments, the receiving of the RRC re-establishment request message sent by the terminal in the above step S101 may be that the distributed unit receives the RRC re-establishment request message sent by the terminal.

[0087] In some embodiments, when the original serving cell of the UE and the target cell when the UE is reestablished are in the same gNB (that is, when the terminal is reestablished within the network coverage of the same base station), refer to Figure 5 , is a schematic diagram of a flow chart of re-establishment in an existing base station provided in an embodiment of the present application. Figure 5 As shown, in addition to the problems described in the above background technology, there is also the following problem, that is, since the gNB has the context information of the UE during re-establishment, for the interaction between the gNB-DU and the gNB-CU, Figure 5 In the flowchart shown, message 9 uses a terminal context modification request (UE CONTEXT MODFICATION REQUEST). However, for reestablishment in an inactive state, since the gNB-DU has released the stored terminal context information, it cannot respond to the gNB-CU's context modification request for the terminal, that is, it cannot use UE CONTEXT MODFICATION REQUEST for interaction, that is, the existing protocol cannot support reestablishment in an inactive state within the base station.

[0088] It should be noted that Figure 5 The interaction process among UE, gNB-DU and gNB-CU in the current standard protocol is exemplified. The specific interaction process and corresponding description can refer to the corresponding description in the relevant technology and will not be repeated here.

[0089] Based on the above problems, Figure 6 As shown, after step S101, the method may further include the following steps:

[0090] S301. A distributed unit receives a context establishment request message sent by a centralized unit.

[0091] The context establishment request message is used to request the establishment of context information of the terminal. The context establishment request message may include at least one of the following: an identity document (ID) of the terminal, a size of the ID of the terminal, a list of inactive timing advances (TA) of the terminal, an identifier of an encryption algorithm, etc.

[0092] It should be noted that the content included in the context establishment request message shown above is only exemplary. For the specific content included in the context establishment request message, reference can be made to the description of UE CONTEXTMODFICATION REQUEST in the relevant technology, which will not be repeated here.

[0093] S302: In response to the context establishment request message, the distributed unit sends a context establishment response message to the centralized unit.

[0094] The context establishment response message is used to indicate that the context information of the terminal has been established. The context establishment response message includes at least one of the following: the terminal ID in AMF and Next Generation Application Protocol (NGAP) (AMF UE NGAP ID), the terminal ID in Radio Access Network (RAN) and NGAP (RAN UE NGAP ID), etc.

[0095] It should be understood that after receiving the RRC re-establishment request message sent by the terminal, the DU cannot respond to the above because the DU has released the context information of the terminal. Figure 5 The message 9 shown in FIG. 9 indicates that the CU cannot respond to the terminal context modification request (UE CONTEXT MODFICATION REQUEST) from the DU, and the DU cannot support the re-establishment in the inactive state.

[0096] Based on this, the embodiment of the present application proposes that, when the DU has released the context information of the terminal, the CU sends a context establishment request message (UE CONTEXT SETUP REQUEST) to the DU, replacing the above Figure 5 Message 9 shown in the figure requests to re-establish the context of the terminal, and then DU sends a context establishment response message (UE CONTEXT SETUPRESPONSE) to CU to indicate that CU has established the context of the terminal, which solves the current process control problem that UE CONTEXTMODFICATION REQUEST cannot be continued to be used according to the protocol, thereby supporting the subsequent re-establishment of the terminal and the base station in an inactive state, so as to facilitate the re-establishment of the terminal and the base station in an inactive state.

[0097] A communication method provided in an embodiment of the present application is illustrated below with reference to a specific example. Figure 7 FIG. 1 is a schematic diagram of an overall process of reestablishing in an inactive state provided by an embodiment of the present application. Taking the first base station as a gNB as an example, see Figure 7, when the gNB-CU detects that the UE has no data service within a preset time, the gNB-CU sends a UE Context Release Command to the gNB-DU to instruct the gNB-DU to release the UE's context information. After receiving the UE Context Release Command, the gNB-DU releases the UE's context and sends an RRC Release message (RRCRelease) to the UE to instruct the UE to release the RRC connection. Due to poor wireless link and other reasons, the UE fails to successfully receive the RRC Release message, and the gNB-DU recognizes that the RRC Release message has been sent successfully and recognizes that the UE has entered an inactive state. Since the UE fails to successfully receive the RRC Release message, the UE still recognizes that it remains in a connected state.

[0098] When the UE has uplink data (messages) to send or detects RLF, the UE sends an RRC Reestabishment Request message to the gNB-DU. After receiving the RRC Reestabishment Request message, the gNB-DU sends an Initial UL RRC Message Transfer to the gNB-CU. Then the gNB-CU sends a DL RRC Message Transfer to the gNB-DU. Then the gNB-DU sends an RRC Reestabishment message to the UE. After the RRC reestablishment is completed, the UE sends an RRC Reestabishment Complete message to the gNB-DU to indicate that the gNB-DU RRC reestablishment is complete.

[0099] Then the gNB-DU sends an UL RRC Message Transfer (UL RRC Message Transfer ULRRC) to the gNB-CU. After receiving the UL RRC Message Transfer, the gNB-CU sends a DL RRC Message Transfer (DL RRC MessageTransfer) to the gNB-DU. At this point, the gNB-CU recognizes that the current scenario is a re-establishment in the UE inactive state, so the gNB-CU sends a UE context setup request message to the gNB-DU. The gNB-DU sends a UE context setup response message to the gNB-CU, and then the gNB-CU sends a DLRRC Message Transfer to the gNB-DU.

[0100] After the gNB-DU receives the DLRRC message, it determines that the UE is in an inactive state because the UE context has been released before. The gNB-DU sends an RRC Reconfiguration message (RRC Reconfiguration) to the UE. The RRC Reconfiguration message includes the full configuration parameter Full config (carries Full config).

[0101] After receiving the RRC reconfiguration message, the UE re-establishes the PDCP connection with the gNB based on the full configuration parameters included in the RRC reconfiguration message, and then sends an RRC reconfiguration complete message (RRC ReconfigurationComplete) to the gNB-DU to indicate that the gNB has completed the RRC reconfiguration.

[0102] After receiving the RRC Reconfiguration Complete message, the gNB-DU determines that the UE has completed the RRC reconfiguration and then sends an ULRRC Message Transfer to the gNB-CU.

[0103] In this way, the re-establishment of the UE in the inactive state is completed.

[0104] The above embodiment is described by taking as an example that the cell selected by the terminal during re-establishment and the cell connected before re-establishment are both cells within the service coverage area of ​​the first base station.

[0105] In some embodiments, when the terminal is reestablished, the service coverage area of ​​the second base station is moved to the service coverage area of ​​the first base station, that is, the reestablishment is performed across base stations, such as Figure 8 As shown, a communication method provided in an embodiment of the present application may further include the following steps after step S101:

[0106] S401: When determining that the network side state of the terminal is an inactive state, send context request information to a second base station.

[0107] The context request information is used to request the context information of the terminal, the second base station is the base station that most recently provided services to the terminal, which can be understood as the base station that provided services to the terminal for the last time, and the first base station can be understood as the base station that currently provides services to the terminal.

[0108] It should be understood that since the first base station is not the base station that has recently provided services to the terminal, the first base station does not store the context information related to the terminal. Therefore, when the first base station receives the RRC re-establishment request information sent by the terminal and determines that the network side state of the terminal is in an inactive state,

[0109] The first base station sends context request information to the second base station to request context information of the terminal.

[0110] S402: Receive context response information sent by the second base station.

[0111] The context response information includes full configuration parameters, and the full configuration parameters are used to instruct to re-establish a packet data convergence protocol connection.

[0112] After receiving the context request information sent by the first base station, the second base station has released the context information of the terminal and has recognized that the network side status of the terminal is inactive. Therefore, the context response information sent by the second base station to the first base station includes full configuration parameters, indicating that the first base station has a risk of resource misalignment.

[0113] After the first base station receives the context response information sent by the second base station, the first base station determines that there is a risk of resource misalignment with the terminal based on the full configuration parameters included in the context response information. In order to successfully re-establish with the terminal in an inactive state, the first base station stores the full configuration parameters so that when responding to the RRC re-establishment request information of the terminal later, the RRC reconfiguration message sent to the terminal includes the full configuration parameters to instruct the terminal to re-establish the packet data convergence protocol connection, thereby realizing the re-establishment of the base station and the terminal in an inactive state.

[0114] In some embodiments, when the original serving cell of the UE and the target cell of the UE re-establishment are not in the same gNB (i.e., cross-base station re-establishment), see Fig. 9 , is a flow chart of an existing cross-base station re-establishment provided in an embodiment of the present application. When the last serving gNB recognizes that the network side status of the UE is in an inactive state, when the last serving gNB receives the UE's re-establishment request (Retrieve UE Context Request), there is a problem of data transmission without a data radio bearer (DRB). That is, since the last serving gNB has recognized that the terminal is in an inactive state, the DRB information has been released. Fig. 9 The data transmission indication (message 6, XN-U Address Indication) sent by the gNB (i.e., the current serving base station) to the Last Serving gNB shown in the figure cannot continue to transmit data back according to the DRB. In other words, there is a problem of data transmission without DRB data when reestablishing across base stations in the inactive state.

[0115] It should be noted that Fig. 9The interaction process between UE, gNB, Last Serving gNB and access and mobility management function (AMF) network element in the current standard protocol is shown as an example. The specific interaction process and corresponding description can refer to the description in the relevant technology and will not be repeated here. Fig.10 As shown, after step S102, the method may further include the following steps:

[0116] S501. Send an address indication request message to a second base station.

[0117] The address indication request message is used to request a forwarding address for data reverse transmission.

[0118] It should be understood that data transmission during terminal switching is a key technical issue. In order to achieve lossless data transmission and save wireless resources of the air interface, the data that has not been sent by the source side base station (i.e., the second base station) needs to be transferred to the target side base station (i.e., the first base station) for processing during the switching process. This operation is called data forwarding or data reverse transmission (Data Forwarding).

[0119] When the terminal switches from connecting to the second base station to connecting to the first base station, data back transmission is required. Before data back transmission is performed, the first base station needs to know the forwarding address of data back transmission. Therefore, after the first base station sends an RRC reconfiguration message to the terminal, when receiving the RRC reconfiguration completion message fed back by the terminal, the first base station sends an address indication request message to the second base station.

[0120] In some embodiments, the address indication request message carries a data radio bearer list to trigger the second base station to set an endmark on the DRB reverse transmission channel between the second base station and the first base station.

[0121] It should be understood that when the address indication request message carries a data radio bearer list, it means that the first base station wants to use DRB for data backhaul. However, the second base station has released the context information of the terminal and no longer has the DRB data of the terminal, so it is impossible to use DRB for data backhaul. Therefore, after receiving the address indication request message, the second base station sets an end symbol on the DRB backhaul channel between the second base station and the first base station, and directly terminates the corresponding DRB data backhaul to solve the problem of data backhaul without DRB data when reestablishing across base stations in an inactive state.

[0122] In some embodiments, the address indication request message is an XN-U address indication request message (XN-U AddressIndication).

[0123] In some embodiments, Fig.11 As shown, after step S501, the method further includes the following steps:

[0124] S502: Receive a reverse transmission end instruction sent by the second base station.

[0125] The reverse transmission end instruction is used to instruct the first base station to stop reverse transmission of DRB data.

[0126] Exemplarily, taking the address indication request message as an XN-U address indication request message, that is, when the XN-U Address Indication received by the second base station carries a data forwarding response DRB list (Data Forwarding Response DRB List), the second base station sends a reverse transmission end instruction to the first base station to instruct the first base station to stop DRB data reverse transmission. Correspondingly, the first base station receives the reverse transmission end instruction sent by the second base station.

[0127] S503: In response to the reverse transmission end instruction, stop the DRB data reverse transmission.

[0128] In this way, the first base station stops performing DRB data backtransmission, that is, the first base station and the second base station stop performing data backtransmission using DRB, thereby solving the problem of data backtransmission without DRB data when reestablishing across base stations in an inactive state.

[0129] In some embodiments, when the first base station stops performing DRB data backtransmission, the first base station performs data backtransmission with the second base station at a protocol data unit (PDU Session) level.

[0130] based on Fig.10 and Fig.11 In the embodiment shown, when the address indication request message carries a data radio bearer list, the second base station sets an end symbol on the DRB reverse transmission channel between the second base station and the first base station, and / or the second base station sends a reverse transmission end instruction to the first base station, so that the first base station stops performing DRB data reverse transmission, thereby solving the problem of data reverse transmission without DRB data when re-establishing across base stations in an inactive state.

[0131] The following is a specific example of the above Figure 8 and Fig.10 The embodiments shown are for illustration purposes only. Fig.12 FIG. 1 is a schematic diagram of the overall process of reestablishing a cross-base station in an inactive state provided by an embodiment of the present application. Fig.12, when the second base station does not detect the data service of the terminal within the preset time, the second base station sends an RRC release message (RRC Release) to the terminal to instruct the terminal to release the RRC connection. Due to reasons such as poor wireless link, the terminal fails to successfully receive the RRC release message, and the second base station recognizes that the RRC release message is sent successfully and recognizes that the terminal has entered an inactive state. Since the terminal fails to successfully receive the RRC release message, the terminal still recognizes that it remains in a connected state.

[0132] When the terminal has uplink data (message) to send or detects RLF, the terminal triggers the re-establishment process because the terminal and the second base station have inconsistent cognition of the current state of the terminal. According to the protocol, the terminal will reselect the cell according to the signal strength of each campus at this time. When the reselected target cell is within the service coverage area of ​​the first base station, after determining the target cell, the terminal sends an RRC re-establishment request message (RRCReestabishment Request) to the first base station where the target cell is located to request to re-establish the RRC connection.

[0133] After receiving the RRC re-establishment request message, the first base station does not store the context information of the terminal, that is, does not obtain the context information of the terminal. Therefore, the first base station sends a context request message (Retrieve UE Context Request) to the second base station to request to obtain the context information of the terminal.

[0134] When the second base station receives the context request information, since the second base station has released the context information of the terminal, the second base station determines that the current scenario is a cross-base station re-establishment in an inactive state, and determines that there is a PDCP SN inconsistency problem between the first base station and the terminal at this time, that is, there is a risk of resource misalignment. Therefore, the second base station sends a context response message (Retrieve UE Context Response) to the first base station, and the context response message carries full configuration parameters (carries Full config) to prompt the first base station that there is a risk of resource misalignment.

[0135] After receiving the context response information, the first base station sends an RRC reconstruction message (RRC Reestabishment) to the terminal. After the RRC reconstruction is completed, the terminal sends an RRC reconstruction completion message (RRC Reestabishment complete) to the first base station to indicate that the RRC reconstruction of the first base station is completed.

[0136] Since the above-mentioned context response information carries full configuration parameters, the first base station determines that there is a risk of resource misalignment of the terminal on the second base station side. Based on this, regardless of the high or low protocol version of the first base station and the terminal, the first base station carries full configuration parameters (carriesFull config) in the first RRC reconfiguration message (RRC Reconfiguration) sent in this re-establishment, and sets the value of the full configuration parameter to True to solve the problem of inconsistent PDCP SN between the terminal and the first base station during cross-base station re-establishment in an inactive state. After the terminal re-establishes the PDCP connection based on the full configuration parameters, it sends an RRC reconfiguration completion message (RRC Reconfiguration complete) to the first base station to indicate that the first base station has completed the RRC reconfiguration.

[0137] In order to perform data forwarding, the first base station sends an address indication request message (XN-U AddressIndication) to the second base station. If the address indication request message carries a data radio bearer list (If carriesData Forwarding Response DRB List), it means that the first base station wants to perform data forwarding with DRB. However, the second base station has released the context information of the terminal and no longer has the DRB data of the terminal, so it is impossible to perform data forwarding with DRB. In this regard, the second base station identifies that the current scenario is a cross-base station re-establishment in an inactive state. The second base station sets an endmark on each DRB channel (per DRB) to directly terminate the DRB data forwarding, so as to solve the problem of data forwarding without DRB during cross-base station re-establishment in an inactive state.

[0138] The second base station sends a sequence number status transmission (SN Status Tranfer) to the first base station. After receiving the sequence number status transmission, the first base station sends a path switch request message (Path Switch Request) to the AMF network element. The first base station then receives a path switch request response message (Path Switch Request Response) sent by the AMF network element. Then the first base station sends a terminal context release message (UE Context Release) to the second base station to indicate that the second base station has released the context information of the terminal.

[0139] In some embodiments, Fig.13 As shown, the embodiment of the present application provides a communication method, which is applied to a terminal, and the terminal may be the above Figure 2 The terminal 31 shown in FIG. 3 comprises the following steps:

[0140] S601. Send an RRC re-establishment request message to a first base station.

[0141] For a description of why the terminal sends the RRC re-establishment request message to the first base station, reference may be made to the corresponding description in the above step S101, which will not be repeated here.

[0142] S602: Receive an RRC reconfiguration message sent by the first base station.

[0143] In some embodiments, when the network side state of the terminal is an inactive state, the RRC reconfiguration message includes full configuration parameters, where the full configuration parameters are used to instruct to re-establish a packet data convergence protocol connection.

[0144] For the description of step S601 - step S602 , reference may be made to the above description of step S101 - step S102 , which will not be repeated here.

[0145] The above mainly introduces the solution provided by the present application from the perspective of interaction between various nodes. It is understandable that each node, such as a terminal or a first base station, includes a hardware structure and / or software module corresponding to each function in order to implement the above functions. It should be easily appreciated by those skilled in the art that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0146] Fig.14 FIG. 1 is a schematic diagram showing the composition of a communication device provided in an embodiment of the present application. Fig.14 As shown, the communication device 70 includes a receiving unit 701 and a sending unit 702 .

[0147] The communication device 70 may be the first base station or a chip in the first base station. When the communication device 70 is used to implement the function of the first base station in the above embodiment, each unit is specifically used to implement the following functions.

[0148] The receiving unit 701 is configured to receive a radio resource control RRC re-establishment request message sent by a terminal and determine a network side state of the terminal.

[0149] The sending unit 702 is used to send an RRC reconfiguration message to the terminal in response to the RRC reestablishment request message when determining that the network side state of the terminal is in an inactive state. The RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate the reestablishment of the packet data convergence protocol connection.

[0150] In some embodiments, the sending unit 702 is specifically configured to determine that the network side state of the terminal is an inactive state when the context information of the terminal is not obtained.

[0151] In some embodiments, the receiving unit 701 is further configured to receive a context release indication when no message from the terminal is received within a preset time period.

[0152] The sending unit 702 is further configured to release the context information of the terminal in response to the context release indication, and send an RRC release message to the terminal, where the RRC release message is used to instruct the terminal to release the RRC connection.

[0153] In some embodiments, the receiving unit 701 is further configured to receive a context establishment request message, where the context establishment request message is used to request to establish context information of the terminal.

[0154] The sending unit 702 is further configured to send a context establishment response message in response to the context establishment request message, where the context establishment response message is used to indicate that the context information of the terminal has been established.

[0155] In some embodiments, the sending unit 702 is further used to send context request information to the second base station when determining that the network side state of the terminal is in an inactive state, the context request information is used to request context information of the terminal, and the second base station is the base station that has recently provided services to the terminal.

[0156] The receiving unit 701 is further configured to receive context response information sent by the second base station, where the context response information includes full configuration parameters, and the full configuration parameters are used to instruct to re-establish a packet data convergence protocol connection.

[0157] In some embodiments, the sending unit 702 is also used to send an address indication request message to the second base station, where the address indication request message is used to request a forwarding address for data reverse transmission, and the address indication request message carries a data radio bearer DRB list to trigger the second base station to set an end symbol on the DRB reverse transmission channel between the second base station and the first base station.

[0158] In some embodiments, the receiving unit 701 is further used to receive a reverse transmission end instruction sent by the second base station, where the reverse transmission end instruction is used to instruct the first base station to stop reverse transmission of DRB data.

[0159] The sending unit 702 is further configured to stop the DRB data backtransmission in response to the backtransmission end instruction.

[0160] In some embodiments, the address indication request message is an XN-U address indication request message.

[0161] Fig.15FIG. 1 is a schematic diagram showing the composition of another communication device provided in an embodiment of the present application. Fig.15 As shown, the communication device 80 includes a sending unit 801 and a receiving unit 802 .

[0162] The communication device 80 may be the above-mentioned terminal or a chip in the terminal. When the communication device 80 is used to implement the functions of the terminal in the above-mentioned embodiment, each unit is specifically used to implement the following functions.

[0163] The sending unit 801 is configured to send an RRC re-establishment request message to the first base station.

[0164] The receiving unit 802 is used to receive an RRC reconfiguration message sent by the first base station; when the network side state of the terminal is inactive, the RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate re-establishment of a packet data convergence protocol connection.

[0165] It should be noted that Fig.14 and Fig.15 The units in the system may also be referred to as modules, for example, the sending unit may be referred to as a sending module. Fig.14 and Fig.15 In the illustrated embodiment, the names of the various units may not be the names shown in the figure. For example, the sending unit may also be called a communication unit, and the receiving unit may also be called a communication unit.

[0166] Fig.14 and Fig.15 If each unit in the embodiment is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods of each embodiment of the present application. The storage medium for storing computer software products includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0167] When the communication device 70 or the communication device 80 implements the functions of the integrated modules in the form of hardware, the present application provides a schematic diagram of the structure of the communication device. Fig.16As shown, the communication device 90 includes: a processor 902 , a communication interface 903 , and a bus 904 . Optionally, the communication device 90 may further include a memory 901 .

[0168] The processor 902 may be a processor that implements or executes various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present application. The processor 902 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present application. The processor 902 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0169] The communication interface 903 is used to connect with other devices via a communication network, such as Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0170] The memory 901 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0171] As a possible implementation, the memory 901 may exist independently of the processor 902, and the memory 901 may be connected to the processor 902 via a bus 904 for storing instructions or program codes. When the processor 902 calls and executes the instructions or program codes stored in the memory 901, the communication method provided in the embodiment of the present application can be implemented.

[0172] In another possible implementation, the memory 901 may also be integrated with the processor 902 .

[0173] The bus 904 may be an extended industry standard architecture (EISA) bus, etc. The bus 904 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.16 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0174] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and conciseness of the description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the base station or terminal is divided into different functional modules to complete all or part of the functions described above.

[0175] The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the above method embodiment can be completed by computer instructions to instruct the relevant hardware, and the program can be stored in the above computer-readable storage medium. When the program is executed, it may include the processes of the above method embodiments. The computer-readable storage medium can be the memory or memory of any of the above embodiments. The above computer-readable storage medium can also be an external storage device of the above first base station or terminal, such as a plug-in hard disk, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. equipped on the above first base station or terminal. Further, the above computer-readable storage medium can also include both the internal storage unit of the above first base station or terminal and an external storage device. The above computer-readable storage medium is used to store the above computer program and other programs and data required by the above first base station or terminal. The above computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0176] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program product is run on a computer, the computer is enabled to execute any one of the communication methods provided in the above embodiments.

[0177] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other changes to the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit can implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0178] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0179] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: Applied to a first base station, the method includes: Receiving a radio resource control (RRC) re-establishment request message sent by a terminal, and determining a network side state of the terminal; When it is determined that the network side state of the terminal is an inactive state, in response to the RRC re-establishment request message, an RRC reconfiguration message is sent to the terminal, the RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate the re-establishment of a packet data convergence protocol connection.

2. The method according to claim 1, characterized in that: The determining the network side status of the terminal includes: In the case where the context information of the terminal is not obtained, it is determined that the network side state of the terminal is an inactive state.

3. The method according to claim 1, characterized in that The first base station includes a centralized unit and a distributed unit; before the receiving terminal sends a radio resource control RRC re-establishment request message, the method further includes: When no message from the terminal is received within a preset time period, the distributed unit receives a context release indication sent by the centralized unit; In response to the context release indication, the distributed unit releases the context information of the terminal and sends an RRC release message to the terminal, where the RRC release message is used to instruct the terminal to release the RRC connection.

4. The method according to claim 1, characterized in that The first base station includes a centralized unit and a distributed unit; after the receiving terminal sends a radio resource control RRC re-establishment request message and determines the network side state of the terminal, the method further includes: The distributed unit receives a context establishment request message sent by the centralized unit, where the context establishment request message is used to request establishment of context information of the terminal; In response to the context establishment request message, the distributed unit sends a context establishment response message to the centralized unit, where the context establishment response message is used to indicate that the context information of the terminal has been established.

5. The method according to claim 2, characterized in that: Before sending the RRC reconfiguration message to the terminal, the method further includes: When determining that the network side state of the terminal is an inactive state, sending context request information to a second base station, where the context request information is used to request context information of the terminal, and the second base station is a base station that has recently provided services to the terminal; Receive context response information sent by the second base station, where the context response information includes full configuration parameters, and the full configuration parameters are used to instruct to re-establish the packet data convergence protocol connection.

6. The method according to claim 5, characterized in that After sending the RRC reconfiguration message to the terminal, the method further includes: An address indication request message is sent to the second base station, where the address indication request message is used to request a forwarding address for data reverse transmission, and the address indication request message carries a data radio bearer DRB list to trigger the second base station to set an end symbol on the DRB reverse transmission channel between the second base station and the first base station.

7. The method according to claim 6, characterized in that After sending the address indication request message to the second base station, the method further includes: receiving a reverse transmission end instruction sent by the second base station, where the reverse transmission end instruction is used to instruct the first base station to stop reverse transmission of DRB data; In response to the reverse transmission end instruction, the DRB data reverse transmission is stopped.

8. The method according to claim 6, characterized in that The address indication request message is an XN-U address indication request message.

9. A communication method, characterized in that: Applied to a terminal, the method comprises: Sending an RRC re-establishment request message to the first base station; An RRC reconfiguration message is received from the first base station; when the network side state of the terminal is an inactive state, the RRC reconfiguration message includes full configuration parameters, and the full configuration parameters are used to indicate re-establishment of a packet data convergence protocol connection.

10. A communication device, characterized in that: include: a processor and a memory for storing instructions executable by the processor; The processor is configured to execute the instructions so that the communication device performs the method according to any one of claims 1 to 9.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is enabled to execute the method according to any one of claims 1 to 9.

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