Report Sending Method, Terminal, Base Station, Device, and Storage Medium

Abstract

The present application provides a report sending method, a terminal, a base station, an apparatus, and a storage medium. The method includes: determining an identifier of a second MRB set by a source base station for a QoS Flow of a target MBS service based on an identifier of a first MRB set by a target base station for the QoS Flow of the target MBS service; and sending a PDCP status report for the QoS Flow of the target MBS service to the target base station through a Packet Data Convergence Protocol PDCP entity corresponding to the identifier of the second MRB. The embodiment of the present application utilizes a PDCP entity established for the second MRB of the source base station before switching, thereby avoiding triggering the release and establishment process of the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

Description

Technical Field

[0001] (Cross - reference to Related Applications) This application claims priority to a Chinese patent application filed on October 21, 2021, with application number 202111228460.6 and invention title "Report Transmission Method, Terminal, Base Station, Device, and Storage Medium", the entire content of which is incorporated herein by reference in its entirety.

[0002] This application relates to the technical field of communications, and in particular, to a report transmission method, terminal, base station, device, and storage medium.

Background Art

[0003] Packet Data Convergence Protocol (PDCP) is a radio protocol layer. When transmitting data, a radio access network node and a terminal establish one PDCP entity for each radio bearer to process the data to be transmitted.

[0004] However, the identifiers of the Multicast Broadcast System Radio Bearers (MRBs) established by different Radio Access Network (RAN) nodes for the Quality of Service (QoS) flows of the same Multicast Broadcast System (MBS) session are different. This means that in the case of handover, the identity identifiers (IDs) of the MRBs assigned to the same MBS session by the source RAN node and the target RAN node are different. Then, when the terminal switches to the target RAN node, it is necessary to trigger the release and establishment of the PDCP entity. Further, if transmission is performed based on the source PDCP status report, it will cause loss of MBS service data.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Embodiments of the present application solve the defect that MBS service data in the prior art is likely to be lost, ensure lossless transmission based on the PDCP status report, and ensure the reliability of data transmission. To achieve this, a report transmission method, a terminal, a base station, a device, and a storage medium are provided.

Means for Solving the Problems

[0006] In a first aspect, embodiments of the present application provide a report transmission method applied to a terminal device. The method includes: determining, by a source base station, an identifier of a second multi-cast broadcast system radio bearer (MRB) set for a quality of service flow (QoS Flow) of a target multi-cast broadcast system (MBS) service based on an identifier of a first MRB set by a target base station for the QoS Flow of the target MBS service; transmitting, via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB, a PDCP status report for the QoS Flow of the target MBS service to the target base station.

[0007] Optionally, according to the report transmission method according to an embodiment of the present application, the transmitting, via the PDCP entity corresponding to the identifier of the second MRB, the PDCP status report for the QoS Flow of the target MBS service to the target base station includes: receiving, via the PDCP entity corresponding to the identifier of the second MRB, the QoS Flow of the target MBS service; Transmitting, to the target base station, a PDCP status report generated by a PDCP entity corresponding to the identifier of the second MRB, wherein the PDCP status report includes QoS Flow transmission information of the target MBS service.

[0008] Optionally, according to a report transmission method according to an embodiment of the present application, the method further includes: Receiving a mapping relationship between an identifier of a first MRB set by a target base station and an identifier of a second MRB set by a source base station, the mapping relationship being transmitted from the source base station. Determining an identifier of a second MRB set by the source base station for a QoS Flow of the target MBS service based on an identifier of a first multi-cast broadcast system radio bearer (MRB) set by the target base station for a service quality data flow (QoS Flow) of the target multi-cast broadcast system (MBS) service, includes determining an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service.

[0009] Optionally, according to a report transmission method according to an embodiment of the present application, the method further includes: Receiving a first mapping relationship and a second mapping relationship transmitted from the source base station, wherein the first mapping relationship includes a mapping relationship between a QoS Flow of the target MBS service and an identifier of a second MRB set by the source base station, the second mapping relationship includes a mapping relationship between a QoS Flow of the target MBS service and an identifier of a first MRB set by the target base station, and the second mapping relationship is transmitted by the target base station to the source base station. further including determining a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship. Based on the identifier of the first multicast broadcast system radio bearer (MRB) set by the target base station for the quality of service flow (QoS Flow) of the target multicast broadcast system (MBS) service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, including determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service based on the determined mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service.

[0010] In a second aspect, an embodiment of the present application further provides a report transmission method applied to a source base station. The method includes: instructing a terminal device about a mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service; where the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is used to determine, based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, and to instruct the terminal device to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via the PDCP entity corresponding to the identifier of the second MRB.

[0011] As an option, according to the report transmission method according to one embodiment of the present application, instructing the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service described above is receiving the mapping relationship between the identifier of the first MRB transmitted from the target base station and the identifier of the second MRB; including transmitting the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device.

[0012] As an option, according to the report transmission method according to one embodiment of the present application, instructing the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service described above is receiving the second mapping relationship transmitted from the target base station; including transmitting the second mapping relationship and the first mapping relationship to the terminal device, wherein the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for instructing the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB.

[0013] In a third aspect, the embodiment of the present application further provides a terminal device, the terminal device includes a memory, a transceiver, and a processor, The memory is for storing a computer program, the transceiver is for transmitting and receiving data under the control of the processor, and the processor reads the computer program in the memory and based on the identifier of a first multicast broadcast system radio bearer (MRB) set by a target base station for a quality of service data flow (QoS Flow) of a target multicast broadcast system (MBS) service, determining the identifier of a second MRB set by a source base station for the QoS Flow of the target MBS service; transmitting, via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB, a PDCP status report for the QoS Flow of the target MBS service to the target base station.

[0014] Optionally, according to a terminal device according to an embodiment of the present application, the transmitting, via the packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB, the PDCP status report for the QoS Flow of the target MBS service to the target base station includes: receiving, via the PDCP entity corresponding to the identifier of the second MRB, the QoS Flow of the target MBS service; transmitting, to the target base station, a PDCP status report generated by the PDCP entity corresponding to the identifier of the second MRB, where the PDCP status report includes QoS Flow transmission information of the target MBS service.

[0015] Optionally, according to a terminal device according to an embodiment of the present application, the operation further includes: receiving a mapping relationship between an identifier of a first MRB set by a target base station and an identifier of a second MRB set by a source base station, which is transmitted from the source base station. Based on the identifier of the first multicast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS Flow) of the target multicast broadcast system (MBS) service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, includes determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service.

[0016] Optionally, according to a terminal device according to an embodiment of the present application, the operation is receiving a first mapping relationship and a second mapping relationship transmitted from the source base station, where the first mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station, the second mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB set by the target base station, and the second mapping relationship is transmitted by the target base station to the source base station, further including determining a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship, Based on the identifier of the first multicast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS Flow) of the target multicast broadcast system (MBS) service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, Based on the determined mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0017] In a fourth aspect, an embodiment of the present application further provides a source base station, where the source base station includes a memory, a transceiver, and a processor. The memory is for storing a computer program, the transceiver is for transmitting and receiving data under the control of the processor, and the processor reads the computer program in the memory to instruct the terminal device about the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, where the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is used to execute an operation including determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, and instructing the terminal device to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via the PDCP entity corresponding to the identifier of the second MRB.

[0018] Optionally, according to a base station according to an embodiment of the present application, the above-mentioned instructing the terminal device about the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service is Receiving the mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station; including transmitting the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device.

[0019] Optionally, according to a base station according to an embodiment of the present application, the above-mentioned indicating to the terminal device the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service is receiving a second mapping relationship transmitted from the target base station; including transmitting the second mapping relationship and the first mapping relationship to the terminal device, wherein the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for indicating the terminal device the mapping relationship between the identifier of the first MRB and the identifier of the second MRB.

[0020] In a fifth aspect, an embodiment of the present application further provides a report transmission device, and the device includes a determination module configured to determine an identifier of a second multicast broadcast system radio bearer (MRB) set by a source base station for the QoS Flow of the target MBS service based on an identifier of a first MRB set by a target base station for a service quality data flow (QoS Flow) of a target multicast broadcast system (MBS) service; A transmission module configured to transmit a PDCP status report for a QoS Flow of the target MBS service to the target base station via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB.

[0021] Optionally, according to a report transmission apparatus according to an embodiment of the present application, the fact that the transmission module is configured to transmit a PDCP status report for a QoS Flow of the target MBS service to the target base station via a PDCP entity corresponding to the identifier of the second MRB The transmission module is configured to receive a QoS Flow of the target MBS service via a PDCP entity corresponding to the identifier of the second MRB; The transmission module is configured to transmit a PDCP status report generated by a PDCP entity corresponding to the identifier of the second MRB to the target base station, and the PDCP status report includes QoS Flow transmission information of the target MBS service.

[0022] Optionally, according to a report transmission apparatus according to an embodiment of the present application, the apparatus Further includes a first receiving module configured to receive a mapping relationship between an identifier of a first multicast broadcast system radio bearer (MRB) set by a target base station and an identifier of a second MRB set by a source base station, the mapping relationship being transmitted from the source base station; The fact that the determination module is configured to determine an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service based on an identifier of a first MRB set by the target base station for a quality of service data flow (QoS Flow) of a target multicast broadcast system (MBS) service The determination module is configured to determine an identifier of a second multi-radio bearer (MRB) set by the source base station for the QoS flow of the target multi-cast broadcast system (MBS) service based on the mapping relationship and an identifier of a first MRB set by the target base station for the QoS flow of the target MBS service.

[0023] Optionally, according to a report transmission device according to an embodiment of the present application, the device A second receiving module configured to receive a first mapping relationship and a second mapping relationship transmitted from the source base station, where the first mapping relationship includes a mapping relationship between the QoS flow of the target MBS service and an identifier of a second MRB set by the source base station, the second mapping relationship includes a mapping relationship between the QoS flow of the target MBS service and an identifier of a first MRB set by the target base station, and the second mapping relationship further includes a second receiving module transmitted from the target base station to the source base station. The determination module is configured to determine a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship. The determination module is configured to determine an identifier of a second MRB set by the source base station for the QoS flow of the target MBS service based on an identifier of a first multi-cast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS flow) of the target multi-cast broadcast system (MBS) service. The determination module is configured to determine an identifier of a second MRB set by the source base station for the QoS flow of the target MBS service based on the determined mapping relationship and an identifier of a first MRB set by the target base station for the QoS flow of the target MBS service.

[0024] In a sixth aspect, an embodiment of the present application further provides a report transmission device, where the device includes an instruction module configured to instruct a terminal device of a mapping relationship between an identifier of a first MRB set by a target base station for a QoS Flow of a target MBS service and an identifier of a second MRB set by a source base station for the QoS Flow of the target MBS service, where the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the source base station determines the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, and the terminal device is instructed to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via a PDCP entity corresponding to the identifier of the second MRB.

[0025] Optionally, according to a report transmission device according to an embodiment of the present application, that the instruction module is configured to instruct a terminal device of a mapping relationship between an identifier of a first MRB set by a target base station for a QoS Flow of a target MBS service and an identifier of a second MRB set by a source base station for the QoS Flow of the target MBS service includes that the instruction module is configured to receive a mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station, and the instruction module is configured to transmit the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device.

[0026] As an option, according to the report transmission device according to one embodiment of the present application, the instruction module is configured to instruct the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service. The instruction module is configured to receive the second mapping relationship transmitted from the target base station. The instruction module is configured to transmit the second mapping relationship and the first mapping relationship to the terminal device, including. Here, the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, and the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB. The second mapping relationship and the first mapping relationship are for instructing the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB.

[0027] In a seventh aspect, the embodiment of the present application further provides a processor-readable storage medium storing a computer program for causing a processor to execute the steps in the report transmission method according to the first aspect as described above, or the steps in the report transmission method according to the second aspect as described above.

[0028] The report transmission method, terminal, base station, device, and storage medium according to the embodiment of the present application determine the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service. Further, by using the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, and transmitting the PDCP status report for the QoS Flow of the target MBS service to the target base station, it is possible to avoid triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensure lossless transmission based on the PDCP status report, and ensure the reliability of data transmission.

[0029] In the following, in order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the drawings necessary for the description of the embodiments or the prior art will be briefly described. Of course, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Brief Description of the Drawings

[0030]

Figure 1

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Embodiments for Carrying Out the Invention

[0031] The term "and / or" in the embodiments of the present application describes the relationship of related objects and indicates that three types of relationships may exist. For example, A and / or B may indicate three cases: when A exists alone, when A and B exist simultaneously, and when B exists alone. The symbol " / " usually indicates that the related objects before and after are in an "or" relationship.

[0032] The term "plurality" in the embodiments of the present application means two or more, and other quantifiers are similar to this.

[0033] Hereinafter, with reference to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Of course, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0034] The embodiments of the present application provide a report transmission method and device to ensure lossless transmission based on the PDCP status report and ensure the reliability of data transmission.

[0035] Here, the method and the device are based on the concept of the same application, and the principles of solving problems of the method and the device are similar. Therefore, the implementation of the device and the method can be referred to each other, and the overlapping points will not be described.

[0036] The technical solution according to the embodiment of the present application is applicable to various systems, especially 5G systems. For example, applicable systems include Global System of Mobile Communication (GSM), Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA (registered trademark)), General Packet Radio Service (GPRS) system, Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Long Term Evolution Advanced (LTE-A) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) system, 5G New Radio (NR) system, etc. Each of these various systems includes terminal devices and network devices. The system may also include a core network part such as an evolved packet system (EPS), 5G system (5GS), etc.

[0037] First, the following content will be described.

[0038] (1) Regarding the multicast and the Multicast Broadcast Service Radio Bearer (MRB) identifier In a wireless communication system, multiple terminal devices (UE: User Equipment) may request the same downlink service data. In such a case, in order to reduce wireless resource consumption as much as possible, the industry has proposed multicast and broadcast mechanisms in which the network transmits a single downlink data using specific wireless resources and multiple UEs are allowed to receive this single downlink data simultaneously. On the other hand, conventionally, the fact that downlink data can only be received by one UE is called the unicast mechanism. The part of the wireless communication system that supports multicast and broadcast is called the multicast broadcast system (MBS: Multicast Broadcast System).

[0039] In a communication system, different data has different quality of service (QoS: Quality of Service) needs, but one UE may receive data packets with different QoS needs simultaneously. Data packets with the same QoS needs form one QoS flow and are identified by a QoS flow identifier (QFI: QoS Flow ID). However, in radio transmission, in order to perform differentiated scheduling, the radio access network (RAN: Radio Access Network) can set up multiple radio bearers to bear these QoS flows. Each radio bearer has its own configuration information and uses a radio bearer identifier as the unique identifier. The RAN node notifies these radio bearer identifiers and the corresponding configuration information to the UE via radio signaling.

[0040] When a UE switches between two RAN nodes, due to changes in the channel environment, the settings of the radio bearers also need to be adaptively changed. At this time, the target RAN node after the switch notifies the UE, via the radio bearer identifier, of what changes need to be made to the settings of each radio bearer. The multicast mechanism is no exception. Its service data is transmitted via a multicast broadcast system radio bearer (MRB: MBS Radio Bearer), and the RAN node also notifies the UE, via radio signaling, of the identifier of the MRB and the corresponding configuration information. The identifier of the MRB is called the MRB ID.

[0041] In the multicast mechanism, considering aspects such as management, maintenance, and security protection of data, when multiple UEs are connected to the same RAN node and receive the same multicast service data flow, for this same service data flow, the RAN node must instruct all UEs to establish MRBs with exactly the same identifier and settings. That is, the MRB ID is global at the RAN node and is valid for all UEs receiving the MBS service. However, according to the prior art, the MRB ID is assigned independently by each RAN node. Therefore, the MRB IDs assigned by different RAN nodes for the same service data flow may be different.

[0042] (2) Regarding the PDCP status report after the switch The Packet Data Convergence Protocol (PDCP) is a radio protocol layer. When transmitting data, the radio access network (RAN) node and the UE establish one PDCP entity for each radio bearer to process the data to be transmitted. After handover, the UE must release the old DRB and establish a new DRB, thereby releasing the old PDCP entity and establishing a new PDCP entity. In this case, the PDCP status report becomes unavailable, and furthermore, lossless transmission of user data cannot be ensured in this way.

[0043] The DRB is used only for a single UE. The target base station can easily assign the same DRB ID to the UE so that lossless transmission based on the PDCP status report can be achieved during handover.

[0044] The MRB is used for MBS service transmission. Different from the DRB used only for a single UE, the MBS service carried by the MRB can be received by multiple UEs. Therefore, before a certain UE performs handover, the corresponding MBS service may have been transmitted at the target base station for some time, and the MRB ID used there may be different from the MRB ID used at the source base station. After this UE switches to the target base station, it can only receive the MBS service using the existing MRB (with a different MRB ID from that of the source base station).

[0045] When the identifiers of the MRBs established by different RAN nodes for the same QoS flow of an MBS session are different, when the base station and the UE switch to the target cell, they trigger the release and establishment of the PDCP entity. In the case of existing unicast, the lossless transmission mechanism based on the PDCP status report cannot operate, and further data loss will occur. To overcome this defect, the embodiments of the present application propose a report transmission method, apparatus, terminal device, base station, and storage medium, which can effectively ensure lossless transmission based on the PDCP status report and improve the reliability of data transmission.

[0046] FIG. 1 is a flowchart part 1 of a report transmission method according to an embodiment of the present application. As shown in FIG. 1, the embodiment of the present application provides a report transmission method, and its execution body may be a terminal device such as a mobile phone. The method includes step 101 and step 102.

[0047] In step 101, based on the identifier of the first multi-cast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS Flow) of the target multi-cast broadcast system (MBS) service, the source base station determines the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0048] Specifically, in the embodiments of the present application, after switching to the target base station, the identifier of the first MRB established by the terminal device for the QoS Flow of the target MBS service is different from the identifier of the second MRB in the source base station of the QoS Flow of the target MBS service. Therefore, the terminal device has to release the old DRB and establish a new DRB. As a result, the terminal device needs to establish a new PDCP entity, which causes data loss. To overcome this defect, after the terminal device determines the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, it can find the identifier of the second MRB corresponding to the identifier of the first MRB. The second MRB is the MRB set by the source base station for the QoS Flow of the target MBS service. Furthermore, the terminal device can continue to use the PDCP entity of the QoS Flow of the target MBS service for the second MRB in the source base station, that is, the PDCP entity corresponding to the identifier of the second MRB.

[0049] In step 102, a PDCP status report for the QoS Flow of the target MBS service is transmitted to the target base station via the packet data convergence protocol PDCP entity corresponding to the identifier of the second MRB.

[0050] Specifically, in the embodiments of the present application, the terminal device can determine to continue using the corresponding PDCP entity set by the source base station for the QoS Flow of the target MBS service, ensuring that the lossless transmission mechanism based on the PDCP status report operates normally and ensuring the reliability of data transmission.

[0051] Specifically, in the embodiments of the present application, the terminal device, based on the mapping relationship between the corresponding MRB ID (identifier of the second MRB) in the source cell and the corresponding MRB ID (identifier of the first MRB) in the target cell of the same MBS QoS Flow (QoS Flow of the target MBS service) of the MBS session, can continue to use the PDCP entity set by the source base station for the QoS Flow of the target MBS service for the first MRB corresponding in the target cell at the target base station. When switching to the target cell, the process of releasing and establishing the PDCP entity corresponding to such an MRB can be avoided, and thus lossless transmission of the multicast service can be realized.

[0052] Specifically, in the embodiments of the present application, for the QoS Flow of the target MBS service, the identifiers of the radio bearers for bearing the QoS Flow of the target MBS service before and after the switching of the terminal device are associated. In this way, at the time of switching, the target base station can instruct the UE to continue to use the PDCP entity before the switching, and there is no need to release the old PDCP entity and establish a new PDCP entity. Further, after the UE completes the switching, the PDCP entity on the UE side can report a PDCP status report to the target base station to notify which downlink PDCP data packets have already been successfully received before the switching and which downlink PDCP data packets are still not successfully received among the PDCP entities on the target base station side. The PDCP entity on the target base station side can intentionally perform PDCP retransmission based on this status report, and thus lossless transmission of user data is ensured.

[0053] The report transmission method according to the embodiment of the present application determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service. Further, by using the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, and transmitting the PDCP status report for the QoS Flow of the target MBS service to the target base station, it is possible to avoid triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensure lossless transmission based on the PDCP status report, and ensure the reliability of data transmission.

[0054] Optionally, in one embodiment, transmitting the PDCP status report for the QoS Flow of the target MBS service to the target base station via the packet data convergence protocol PDCP entity corresponding to the identifier of the second MRB described above includes: Receiving the QoS Flow of the target MBS service via the PDCP entity corresponding to the identifier of the second MRB; and Transmitting the PDCP status report generated by the PDCP entity corresponding to the identifier of the second MRB to the target base station, where the PDCP status report includes the QoS Flow transmission information of the target MBS service.

[0055] Specifically, before the handover, that is, when still connected to the source base station, the UE may receive the QoS Flow of the target MBS service via the PDCP entity corresponding to the identifier of the second MRB set by the source base station. After the UE has performed the handover, the UE may continue to use the PDCP entity before the handover to send a PDCP status report for the QoS Flow of the target MBS service to the target base station. That is, the PDCP entity on the UE side may report a PDCP status report to the target base station to notify which downlink PDCP data packets have already been successfully received before the handover and which downlink PDCP data packets have not yet been successfully received among the PDCP entities of the target base station. The PDCP entity on the target base station side may intentionally perform PDCP retransmission based on this status report, thereby ensuring lossless transmission of user data.

[0056] Optionally, in one embodiment, the method further includes receiving a mapping relationship between the identifier of the first MRB set by the target base station and the identifier of the second MRB set by the source base station, which is transmitted from the source base station. Determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service based on the identifier of the first multi-cast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS Flow) of the target multi-cast broadcast system (MBS) service includes determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service.

[0057] As an option, when a handover occurs, in the settings of the target base station, the correspondence relationship between the MRB ID (identifier of the second MRB) corresponding to the same MBS QoS Flow (QoS Flow of the target MBS service) of the MBS session in the source cell and the MRB ID (identifier of the first MRB) corresponding to the target cell may be indicated.

[0058] Specifically, before transmission, the terminal device may receive in advance the mapping relationship between the identifier of the first MRB set by the target base station and the identifier of the second MRB set by the source base station, which is transferred by the source base station from the target base station, and based on the mapping relationship, determine the identifier of the second MRB corresponding to the identifier of the first MRB, and further determine the PDCP entity to be continuously used.

[0059] Specifically, after receiving the mapping relationship between the identifier of the first MRB set by the target base station and the identifier of the second MRB set by the source base station, based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the terminal device can determine the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0060] As an option, in one embodiment, the method includes: receiving the first mapping relationship and the second mapping relationship transmitted from the source base station, where the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB set by the target base station, and the second mapping relationship is transmitted by the target base station to the source base station; further comprising determining a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship. Based on the identifier of the first multicast broadcast system radio bearer (MRB) set by the target base station for the quality of service (QoS) flow of the target multicast broadcast system (MBS) service, determining the identifier of the second MRB set by the source base station for the QoS flow of the target MBS service is including determining the identifier of the second MRB set by the source base station for the QoS flow of the target MBS service based on the determined mapping relationship and the identifier of the first MRB set by the target base station for the QoS flow of the target MBS service.

[0061] Optionally, when a handover occurs, the UE may determine the correspondence between the corresponding MRB ID (identifier of the second MRB) in the source cell and the corresponding MRB ID (identifier of the first MRB) in the target cell for the same MBS QoS flow (QoS flow of the target MBS service) of the MBS session based on the received first mapping relationship (mapping relationship between the QoS flow of the target MBS service and the identifier of the second MRB) and the second mapping relationship (mapping relationship between the QoS flow of the target MBS service and the identifier of the first MRB).

[0062] Specifically, before transmission, the terminal device pre-receives the first mapping relationship transmitted from the source base station, and then accesses the source base station to receive MBS service data via the corresponding MRB in the source cell. After the terminal device switches to the target base station, the source base station can receive the second mapping relationship transmitted from the target base station, and the terminal device receives the second mapping relationship from the target base station transferred from the source base station, and based on the first mapping relationship and the second mapping relationship, determines the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, and based on this mapping relationship, determines the identifier of the second MRB corresponding to the identifier of the first MRB, and further can determine the PDCP entity that can still be used.

[0063] Specifically, after the terminal device receives the mapping relationship between the identifier of the first MRB set by the target base station and the identifier of the second MRB set by the source base station, based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the terminal device can determine the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0064] The report transmission method according to the embodiment of the present application determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, and further uses the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, and transmits the PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0065] Figure 2 is the second flowchart of the report transmission method according to the embodiment of the present application. As shown in Figure 2, the embodiment of the present application provides a report transmission method applied to a source base station, and the method includes step 201.

[0066] In step 201, the terminal device is instructed about the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0067] Here, the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, to determine the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, and through the PDCP entity corresponding to the identifier of the second MRB, to instruct the terminal device to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station.

[0068] Specifically, in the embodiments of the present application, after switching to the target base station, the identifier of the first MRB established by the terminal device for the QoS Flow of the target MBS service is different from the identifier of the second MRB in the source base station of the QoS Flow of the target MBS service. Therefore, the terminal device has to release the old DRB and establish a new DRB. As a result, the terminal device needs to establish a new PDCP entity, causing data loss. To overcome this defect, after the terminal device determines the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the source base station can instruct the terminal device to find the identifier of the second MRB corresponding to the identifier of the first MRB, that is, to instruct the mapping relationship between the identifier of the first MRB and the identifier of the second MRB. The second MRB is the MRB set by the source base station for the QoS Flow of the target MBS service. Further, the terminal device can continue to use the PDCP entity of the QoS Flow of the target MBS service for the second MRB in the source base station, that is, the PDCP entity corresponding to the identifier of the second MRB. In the embodiments of the present application, the terminal device determines to continue to use the corresponding PDCP entity set by the source base station for the QoS Flow of the target MBS service, ensuring that the lossless transmission mechanism based on the PDCP status report operates normally and ensuring the reliability of data transmission.

[0069] As an option, the source base station transmits the above mapping relationship to the terminal device, whereby the terminal device, based on the correspondence relationship (target mapping relationship) between the corresponding MRB ID (identifier of the second MRB) in the source cell and the corresponding MRB ID (identifier of the first MRB) in the target cell of the same MBS QoS Flow (QoS Flow of the target MBS service) of the MBS session, can continue to use the PDCP entity set by the source base station for the QoS Flow of the target MBS service for the MRB corresponding to the target cell at the target base station, and when switching to the target cell, the process of releasing and establishing the PDCP entity corresponding to such an MRB can be avoided, and thus lossless transmission of the multicast service can be realized.

[0070] Specifically, in the embodiments of the present application, for the QoS Flow of the target MBS service, the identifiers of the radio bearers for bearing the QoS Flow of the target MBS service before and after the switching of the terminal device are associated, so that at the time of switching, the target base station can instruct the UE to continue to use the PDCP entity before the switching, and there is no need to release the old PDCP entity and establish a new PDCP entity. Further, after the UE completes the switching, the PDCP entity on the UE side can report a PDCP status report to the target base station to notify which downlink PDCP data packets have already been successfully received before the switching and which downlink PDCP data packets are still not successfully received among the PDCP entities on the target base station side. The PDCP entity on the target base station side can intentionally perform PDCP retransmission based on this status report, and thus lossless transmission of user data is ensured.

[0071] The report transmission method according to the embodiment of the present application instructs the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, so that the terminal device can, based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, determine the identifier of the second MRB set by the source base station for the same QoS Flow. Further, by using the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, and transmitting the PDCP status report for the QoS Flow of the target MBS service to the target base station, it is possible to avoid triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensure lossless transmission based on the PDCP status report, and ensure the reliability of data transmission.

[0072] Optionally, in one embodiment, instructing the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service includes receiving the mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station, and transmitting the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device.

[0073] Specifically, the source base station may first receive the mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted by the target base station via the Xn interface. After receiving the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, the source base station can forward it to the terminal device.

[0074] As an option, in one embodiment, instructing the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service is receiving the second mapping relationship transmitted from the target base station; including transmitting the second mapping relationship and the first mapping relationship to the terminal device, wherein the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for instructing the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB.

[0075] As an option, the source base station can transmit the first mapping relationship and the second mapping relationship to the terminal device, so that the terminal device can determine the mapping relationship between the identifier of the first MRB and the identifier of the second MRB. Further, based on the mapping relationship between the MRB ID (identifier of the second MRB) corresponding in the source cell and the MRB ID (identifier of the first MRB) corresponding in the target cell of the same MBS QoS Flow (QoS Flow of the target MBS service) of the MBS session, at the target base station, for the MRB corresponding in the target cell, the PDCP entity set by the source base station for the QoS Flow of the target MBS service can continue to be used, and the process of releasing and establishing the PDCP entity corresponding to the MRB when switching to the target cell is avoided, and thus lossless transmission of the multicast service can be realized.

[0076] Specifically, the source base station first receives the second mapping relationship transmitted by the target base station via the Xn interface, and after receiving the second mapping relationship, the source base station can transfer it to the terminal device.

[0077] Specifically, the source base station establishes one MRB (corresponding to the identifier of the second MRB) for the QoS Flow of the target MBS service in the MBS session. Then, the source base station can use the MRB to transmit MBS service data via radio. Furthermore, the source base station transmits the first mapping relationship to the terminal device, and the terminal device can access the source base station and receive MBS service data via the corresponding MRB in the source cell. After the terminal device switches to the target base station, the source base station receives the second mapping relationship transmitted from the target base station and transfers it to the terminal device, and the terminal device can receive the second mapping relationship from the target base station transferred from the source base station.

[0078] Then, based on the first mapping relationship and the second mapping relationship, determine the mapping relationship between the identifier of the first MRB and the identifier of the second MRB. Based on this mapping relationship, determine the identifier of the second MRB corresponding to the identifier of the first MRB, and further continue to determine the available PDCP entity.

[0079] The report transmission method according to the embodiment of the present application instructs the terminal device about the mapping relationship between the identifier of the first MRB and the identifier of the second MRB. Based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, the terminal device determines the identifier of the second MRB set by the source base station for the same QoS Flow. Furthermore, by using the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, and transmitting the PDCP status report for the QoS Flow of the target MBS service to the target base station, it is possible to avoid triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report and ensuring the reliability of data transmission.

[0080] Optionally, FIG. 3 is a flowchart part 3 of the report transmission method according to the embodiment of the present application. As shown in FIG. 3, the embodiment of the present application provides a report transmission method. In the setting of the target base station, it is possible to instruct the target mapping relationship between the identifier of the second MRB corresponding in the source cell and the identifier of the first MRB corresponding in the target cell for the QoS Flow of the target MBS service. The method includes the following steps 1 to 8.

[0081] In step 1, the core network instructs base station 1 (source base station) to establish an MBS session.

[0082] In step 2, base station 1 can establish one MRB for one QoS Flow of one target MBS service in the MBS session and identify it with MRB ID 1 (identifier of the second MRB). Then, base station 1 starts transmitting MBS service data via the radio using the MRB.

[0083] In step 3, the base station 1 sets the mapping relationship between the MBS session for the UE and the QoS Flow identifier and the MRB of the target MBS service.

[0084] In step 4, the UE accesses the base station 1 and receives MBS service data via the above MRB.

[0085] In step 5, at a certain point, due to the movement of the UE or the like, the base station 1 decides to switch the UE to the base station 2, and thus starts the switching preparation process for the base station 2. The target base station (base station 2) allocates an MRB for the QoS Flow of the same target MBS service of the same service and designates the MRB ID 2 (the identifier of the first MRB), and the target base station (base station 2) transmits the target mapping relationship between the MRB ID 2 corresponding to the QoS Flow of the target MBS service and the MRB ID 1 to the source base station (base station 1) via the Xn interface.

[0086] In step 6, the base station 1 transparently transmits the target mapping relationship to the UE.

[0087] In step 7, following the instruction of the network, the UE switches from the base station 1 to the base station 2, determines that the QoS Flow of the same target MBS service is mapped to the MRB ID 2 at the target base station, and thus continues to use the PDCP entity for the MRB ID 1 to receive data at the target base station.

[0088] In step 8, the UE executes the lossless transmission process for switching based on the PDCP status report, and reports the PDCP data reception status at the MRB ID 1 at the source base station as the status of the MRB ID 2 to the target base station via the PDCP status report.

[0089] As an option, FIG. 4 is a flowchart of the fourth report transmission method according to the embodiment of the present application. As shown in FIG. 4, the embodiment of the present application provides a report transmission method. The UE can determine the target mapping relationship between the identifier of the second MRB corresponding to the QoS Flow of the target MBS service in the source cell and the identifier of the first MRB corresponding to the target cell based on the received first mapping relationship and the second mapping relationship. The method includes the following steps 1 to 9.

[0090] In step 1, the core network instructs the base station 1 (source base station) to establish an MBS session.

[0091] In step 2, the base station 1 can establish one MRB for one QoS Flow of the target MBS service in the MBS session and identify it with the MRB ID 1 (identifier of the second MRB). Then, the base station 1 starts to transmit MBS service data via the radio using the MRB.

[0092] In step 3, the base station 1 sets an MBS session for the UE and a first mapping relationship between the QoS Flow identifier of the target MBS service and the MRB.

[0093] In step 4, the UE accesses the base station 1 and receives MBS service data via the above MRB.

[0094] In step 5, at a certain point, due to the movement of the UE or the like, the base station 1 decides to switch the UE to the base station 2, and thus starts the switching preparation process for the base station 2. The target base station (base station 2) allocates an MRB to the QoS Flow of the same target MBS service of the same service and designates the MRB ID 2 (identifier of the first MRB). The target base station (base station 2) transmits the second mapping relationship between the QoS Flow of the target MBS service and the MRB ID 2 to the source base station (base station 1) via the Xn interface.

[0095] In step 6, as a relay, the base station 1 transmits the MBS session in the base station 2 and the second mapping relationship between the QoS Flow of the target MBS service and the MRB ID 2 to the UE via an RRC message.

[0096] In step 7, the UE obtains the mapping relationship between the MRB ID1 and the MRB ID2 based on the settings of the base station 1 and the base station 2.

[0097] In step 8, following the instruction of the network, the UE switches from the base station 1 to the base station 2, determines that the QoS Flow of the same target MBS service is mapped to the MRB ID 2 at the target base station, and thus continues to use the PDCP entity for the above MRB ID 1 to receive data at the target base station.

[0098] In step 9, the UE executes the lossless transmission process for switching based on the PDCP status report, and reports the PDCP data reception status at the MRB ID 1 in the source base station as the status of the MRB ID 2 to the target base station via the PDCP status report.

[0099] The report transmission method according to the embodiment of the present application determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, and further uses the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit the PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0100] The terminal device according to the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the name of the terminal device may be different. For example, in a 5G system, the terminal device can be called a user equipment (UE). The wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device such as a mobile phone (or called a "cellular" phone) or a computer having a mobile terminal device. For example, it is a portable, pocket-sized, handheld, computer-integrated, or in-vehicle mobile device that exchanges language and / or data with the wireless access network. Examples include devices such as personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, and personal digital assistants (PDA). The wireless terminal device can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, and is not limited in the embodiment of the present application.

[0101] The network device according to the embodiment of the present application may be a base station that can include a plurality of cells for providing services to terminals. Depending on specific application scenarios, the base station may also be referred to as an access point, or may be a device that communicates with wireless terminal devices via one or more sectors on an air interface in an access network, or may have other names. The network device can be used to exchange received air frames and Internet Protocol (IP) packets with each other as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also adjust the attribute management of the air interface. For example, the network device according to the embodiment of the present application may be a network device (BTS: Base Transceiver Station) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), or may be a network device (NodeB) in a Wide-band Code Division Multiple Access (WCDMA (registered trademark)), or may be an evolved network device (eNB or e-NodeB: evolutional Node B) in a Long Term Evolution (LTE) system, or may be a 5G base station (gNB) in a 5G network architecture (next generation system), or may be a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiment of the present application.In some network structures, network devices may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may be geographically separated and arranged.

[0102] FIG. 5 is a schematic diagram of the structure of a terminal device according to an embodiment of the present application. As shown in FIG. 5, the terminal device includes a memory, a transceiver, and a processor.

[0103] The transceiver 500 is used to transmit and receive data under the control of the processor 510.

[0104] Here, in FIG. 5, the bus architecture may include any number of interconnected buses and bridges. Specifically, various circuits of one or more processors represented by the processor 510 and the memory represented by the memory 520 are integrally linked. The bus architecture can also integrally link various other circuits such as, for example, peripheral devices, voltage regulators, and power management circuits. Since these are all well-known in the art, they will not be further described in this specification. The bus interface provides an interface. The transceiver 500 may be a plurality of elements, that is, it includes a transmitter and a receiver, and provides a unit for communicating with various other devices in the transmission medium. These transmission media include transmission media such as wireless channels, wired channels, and optical cables. For different user devices, the user interface 530 may be an interface that can be externally or internally connected to the necessary devices. The devices to be connected include, but are not limited to, keypads, displays, speakers, microphones, joysticks, etc.

[0105] The processor 510 manages the bus architecture and normal processing, and the memory 520 can store data used when the processor 510 executes operations.

[0106] Optionally, the processor 510 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may adopt a multi-core architecture.

[0107] The processor is used to execute any method applicable to the terminal device according to the embodiments of the present application according to the obtained executable instructions by calling a computer program stored in the memory. The processor and the memory may be physically separated and arranged.

[0108] Specifically, the processor 510 reads the computer program in the memory, Based on the identifier of the first multicast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS Flow) of the target multicast broadcast system (MBS) service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service; Transmitting a PDCP status report for the QoS Flow of the target MBS service to the target base station via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB.

[0109] The terminal device according to the embodiment of the present application determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, and further uses the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit the PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0110] Optionally, the processor 510 further receives the QoS Flow of the target MBS service via the PDCP entity corresponding to the identifier of the second MRB, and transmits the PDCP status report generated by the PDCP entity corresponding to the identifier of the second MRB to the target base station, where the PDCP status report includes the QoS Flow transmission information of the target MBS service, and is used to execute.

[0111] Optionally, the processor 510 further is used to execute receiving the mapping relationship between the identifier of the first MRB set by the target base station and the identifier of the second MRB set by the source base station transmitted from the source base station, Based on the identifier of the first multicast broadcast system radio bearer MRB set by the target base station for the quality of service data flow QoS Flow of the target multicast broadcast system MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service is Based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0112] Optionally, the processor 510 further receives a first mapping relationship and a second mapping relationship transmitted from the source base station, where the first mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station, the second mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB set by the target base station, and the second mapping relationship is transmitted by the target base station to the source base station, is used to execute determining a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship, Based on the identifier of the first multicast broadcast system radio bearer (MRB) set by the target base station for the quality of service data flow (QoS Flow) of the target multicast broadcast system (MBS) service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service means Based on the determined mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service.

[0113] The terminal device according to the embodiment of the present application determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, and further uses the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit the PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0114] FIG. 6 is a schematic diagram of the structure of the source base station according to the embodiment of the present application. As shown in FIG. 6, the source base station includes a memory, a transceiver, and a processor.

[0115] The transceiver 600 is used to transmit and receive data under the control of the processor 610.

[0116] Here, in FIG. 6, the bus architecture may include any number of interconnected buses and bridges. Specifically, various circuits such as one or more processors represented by processor 610 and memory represented by memory 620 are integrally linked. The bus architecture can also integrally link various other circuits such as, for example, peripheral devices, voltage regulators, power management circuits, etc. Since these are all well-known in the art, they will not be further described herein. The bus interface provides an interface. The transceiver 600 may be a plurality of elements, that is, it includes a transmitter and a receiver, and provides a unit for communicating with various other devices in the transmission medium. These transmission media include transmission media such as wireless channels, wired channels, optical cables, etc. The processor 610 manages the bus architecture and normal processing, and the memory 620 can store data used when the processor 610 executes operations.

[0117] The processor 610 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may adopt a multi-core architecture.

[0118] Specifically, the processor 610 reads the computer program in the memory, and is used to execute an instruction to the terminal device on the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service. Here, the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is used to instruct the terminal device to determine the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, and to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via the PDCP entity corresponding to the identifier of the second MRB.

[0119] The source base station according to the embodiment of the present application instructs the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, so that the terminal device determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, and further uses the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0120] Specifically, the processor 610 is further used to receive the mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station, and transmit the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device.

[0121] Specifically, the processor 610 is further used to Receiving a second mapping relationship transmitted from the target base station; Used to execute transmitting the second mapping relationship and the first mapping relationship to the terminal device; Here, the first mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for instructing the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB.

[0122] The source base station according to the embodiment of the present application instructs the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, so that the terminal device can, based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, determine the identifier of the second MRB set by the source base station for the same QoS Flow, and further utilize the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit the PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0123] It should be noted that the above terminal device or source base station according to the embodiment of the present application can implement all the method steps of the above-described method embodiment, and can achieve the same technical effects. Here, the same parts and details of the beneficial effects in the above method embodiment in this embodiment are omitted.

[0124] FIG. 7 is a schematic diagram of the structure of a report transmission device according to an embodiment of the present application. As shown in FIG. 7, the report transmission device includes a determination module 710 and a transmission module 720.

[0125] The determination module 710 is configured to determine an identifier of a second multi-cast broadcast system radio bearer (MRB) set by a source base station for a quality of service (QoS) flow of the target multi-cast broadcast system (MBS) service based on an identifier of a first MRB set by a target base station for a QoS flow of the target MBS service.

[0126] The transmission module 720 is configured to transmit a PDCP status report for the QoS flow of the target MBS service to the target base station via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB.

[0127] The report transmission device according to the embodiment of the present application determines an identifier of a second MRB set by a source base station for the same QoS flow based on an identifier of a first MRB set by a target base station for a QoS flow of the MBS service. Further, by using a PDCP entity corresponding to the identifier of the second MRB, that is, a PDCP entity established for the second MRB of the source base station before the handover, and transmitting a PDCP status report for the QoS flow of the target MBS service to the target base station, it is possible to avoid triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensure lossless transmission based on the PDCP status report, and ensure the reliability of data transmission.

[0128] Optionally, the transmitting module 720 is configured to transmit a PDCP status report for a QoS Flow of the target MBS service to the target base station via a packet data convergence protocol (PDCP) entity corresponding to an identifier of the second MRB. The transmitting module 720 is configured to receive a QoS Flow of the target MBS service via a PDCP entity corresponding to an identifier of the second MRB. The transmitting module 720 is configured to transmit a PDCP status report generated by a PDCP entity corresponding to an identifier of the second MRB to the target base station, where the PDCP status report includes QoS Flow transmission information of the target MBS service.

[0129] Optionally, the apparatus further includes a first receiving module configured to receive a mapping relationship between an identifier of a first multicast broadcast system radio bearer (MRB) set by a target base station and an identifier of a second MRB set by a source base station, the mapping relationship being transmitted from the source base station. The determining module 710 is configured to determine an identifier of a second MRB set by the source base station for a QoS Flow of the target MBS service based on an identifier of a first MRB set by the target base station for a QoS Flow of a target multicast broadcast system (MBS) service. The determining module 710 is configured to determine an identifier of a second MRB set by the source base station for a QoS Flow of the target MBS service based on the mapping relationship and an identifier of a first MRB set by the target base station for a QoS Flow of the target MBS service.

[0130] Optionally, the apparatus A second receiving module configured to receive a first mapping relationship and a second mapping relationship transmitted from the source base station, where the first mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and an identifier of a second MRB set by the source base station, the second mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and an identifier of a first MRB set by the target base station, and the second mapping relationship further includes a second receiving module transmitted by the target base station to the source base station. The determining module 710 is further configured to determine a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship. The determining module 710 is configured to determine an identifier of a second multi-cast broadcast system radio bearer (MRB) set by the source base station for the QoS Flow of the target MBS service based on an identifier of a first multi-cast broadcast system radio bearer (MRB) set by the target base station for the QoS Flow of the target multi-cast broadcast system (MBS) service. The determining module 710 includes being configured to determine an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service based on the determined mapping relationship and an identifier of a first MRB set by the target base station for the QoS Flow of the target MBS service.

[0131] The report transmission device according to the embodiment of the present application determines the identifier of the second MRB set by the source base station for the same QoS Flow based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service. Further, by using the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, and transmitting the PDCP status report for the QoS Flow of the target MBS service to the target base station, the process of releasing and establishing the PDCP entity corresponding to the second MRB is avoided when switching to the target base station, lossless transmission based on the PDCP status report is ensured, and the reliability of data transmission is ensured.

[0132] The report transmission device according to the embodiment of the present application can implement all the method steps realized by the embodiment of the above-described method and can achieve the same technical effects. Here, the same parts and details of the beneficial effects as those of the embodiment of the above method in this embodiment are omitted.

[0133] It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods. Also, in each embodiment of the present application, each functional unit can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0134] FIG. 8 is a schematic diagram of the structure of the report transmission device according to the embodiment of the present application (Part 2). As shown in FIG. 8, the report transmission device includes an instruction module 810. Here, The indication module 810 is configured to indicate to the terminal device the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service. Here, the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is used to instruct the terminal device to determine, based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, and to transmit, via the PDCP entity corresponding to the identifier of the second MRB, a PDCP status report for the QoS Flow of the target MBS service to the target base station.

[0135] The report transmission device according to the embodiment of the present application indicates to the terminal device the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, so that the terminal device determines, based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, the identifier of the second MRB set by the source base station for the same QoS Flow. Further, by using the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station, it is possible to avoid triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensure lossless transmission based on the PDCP status report, and ensure the reliability of data transmission.

[0136] As an option, the instruction module 810 may be configured to instruct the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service. The instruction module 810 may be configured to receive the mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station. The instruction module 810 may be configured to transmit the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device.

[0137] As an option, the instruction module 810 may be configured to instruct the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service. The instruction module 810 may be configured to receive the second mapping relationship transmitted from the target base station. The instruction module 810 may be configured to transmit the second mapping relationship and the first mapping relationship to the terminal device, where the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for instructing the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB. Here, the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for instructing the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB.

[0138] The report transmission device according to the embodiment of the present application instructs the terminal device of the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, so that the terminal device can, based on the identifier of the first MRB set by the target base station for the QoS Flow of the MBS service, determine the identifier of the second MRB set by the source base station for the same QoS Flow, and further utilize the PDCP entity corresponding to the identifier of the second MRB, that is, the PDCP entity established for the second MRB of the source base station before the handover, to transmit the PDCP status report for the QoS Flow of the target MBS service to the target base station, thereby avoiding triggering the process of releasing and establishing the PDCP entity corresponding to the second MRB when switching to the target base station, ensuring lossless transmission based on the PDCP status report, and ensuring the reliability of data transmission.

[0139] The report transmission device according to the embodiment of the present application can implement all the method steps realized by the embodiment of the above method and achieve the same technical effects. Here, the same parts and details of the beneficial effects as those of the embodiment of the above method in this embodiment are omitted.

[0140] It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods. Also, in each embodiment of the present application, each functional unit can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0141] The above integrated unit can be implemented in the form of a software function unit and, when sold or used as an independent product, can be stored in a processor-readable storage medium. Based on such an understanding, the technical solution of the present application may, in essence, or in a part that contributes to the prior art, or all or part of the technical means, be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or some of the steps of the method described in each embodiment of the present application. The above storage medium includes various media capable of storing program codes, such as a USB disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0142] It should be noted that the above device according to the embodiment of the present application can implement all the method steps realized by the embodiment of the above method and can achieve the same technical effects. Here, the details of the same parts and beneficial effects as those in the embodiment of the above method in this embodiment are omitted.

[0143] On the other hand, the embodiment of the present application further provides a processor-readable storage medium storing a computer program for causing a processor to execute the method according to each of the above embodiments, and the method includes determining, by a source base station, an identifier of a second multi-cast broadcast system radio bearer (MRB) set for a quality of service (QoS) flow of the target multi-cast broadcast system (MBS) service based on an identifier of a first MRB set by a target base station for a QoS flow of the target MBS service; Transmitting, via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB, a PDCP status report for the QoS Flow of the target MBS service to the target base station, or instructing the terminal device about a mapping relationship between an identifier of a first MRB set by the target base station for the QoS Flow of the target MBS service and an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service, wherein the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is used to instruct the terminal device to determine, based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, and transmit, via the PDCP entity corresponding to the identifier of the second MRB, a PDCP status report for the QoS Flow of the target MBS service to the target base station.

[0144] The processor-readable storage medium may be any available medium or data storage device accessible by the processor, including but not limited to magnetic memory (e.g., flexible disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid state drive (SSD)), etc.

[0145] As will be understood by those skilled in the art, the embodiments of the present application can be provided as a method, a system, or a computer program product. Accordingly, the present application can adopt an embodiment that is entirely in hardware, an embodiment that is entirely in software, or an embodiment that combines software and hardware. And the present application can adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to magnetic disk memory, optical memory, etc.) containing computer-usable program code.

[0146] The present application will be described with reference to the flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer-executable instructions. These computer-executable instructions are provided to the processor of a general-purpose computer, a dedicated computer, an embedded processor, or other programmable data processing device to generate a machine, so that the functions specified in one or more flows in the flowchart and / or one or more blocks in the block diagram are realized by the instructions executed by the processor of the computer or other programmable data processing device.

[0147] These processor-executable instructions can be stored in a processor-readable memory that can operate a computer or other programmable data processing device in a specific manner, and a product including instruction means can also be generated by the instructions stored in the processor-readable memory. The instruction means realizes the functions specified in one or more flows in the flowchart and / or one or more blocks in the block diagram.

[0148] These processor-executable instructions can also be loaded onto a computer or other programmable data processing device to cause the computer or other programmable device to perform a series of operational steps to generate a process implemented on the computer. Thereby, the instructions executed on the computer or other programmable device provide steps for realizing the functions specified by one or more flows in the flowchart and / or one or more blocks in the block diagram.

[0149] Of course, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these changes and modifications of the present application are included within the scope of the claims of the present application and its equivalent technical scope, the present application is also intended to include these changes and modifications.

Description of Reference Numerals

[0150] 500 Transceiver 510 Processor 520 Memory 530 User Interface 600 Transceiver 610 Processor 620 Memory 710 Decision Module 720 Transmission Module 810 Instruction Module

Claims

1. A report transmission method applied to a terminal device, comprising: Based on an identifier of a first multicast broadcast system radio bearer (MRB) set by a target base station for a quality of service data flow (QoS Flow) of a target multicast broadcast system (MBS) service, a source base station determines an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service; Transmitting a PDCP status report for the QoS Flow of the target MBS service to the target base station via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB. The report transmission method is characterized by the above.

2. The step of transmitting, via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB, a PDCP status report for the QoS Flow of the target MBS service to the target base station, as described above, includes: Receiving the QoS Flow of the target MBS service via a PDCP entity corresponding to the identifier of the second MRB; Transmitting a PDCP status report generated by the PDCP entity corresponding to the identifier of the second MRB to the target base station, wherein the PDCP status report includes QoS Flow transmission information of the target MBS service. The report transmission method according to Claim 1.

3. Further comprising receiving a mapping relationship between an identifier of a first MRB set by a target base station and an identifier of a second MRB set by the source base station, which is transmitted from the source base station; Based on an identifier of a first multicast broadcast system radio bearer (MRB) set by a target base station for a quality of service data flow (QoS Flow) of a target multicast broadcast system (MBS) service, the step of determining an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service includes: Based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, characterized by including this The report transmission method according to claim 1.

4. Receiving the first mapping relationship and the second mapping relationship transmitted from the source base station, where the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB set by the target base station, and the second mapping relationship is transmitted by the target base station to the source base station Further including determining the mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship Based on the identifier of the first multicast broadcast system radio bearer MRB set by the target base station for the quality of service data flow QoS Flow of the target multicast broadcast system MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service means Based on the mapping relationship between the identifier of the first MRB and the identifier of the second MRB, and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, determining the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, characterized by including this The report transmission method according to claim 1.

5. A report transmission method applied to a source base station, including instructing the terminal device of the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service Here, the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, and the source base station determines the identifier of the second MRB set for the QoS Flow of the target MBS service, and is used to instruct the terminal device to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via the PDCP entity corresponding to the identifier of the second MRB. Report transmission method. **Claim 6** Instructing the terminal device about the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service includes: Receiving the mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station; Transmitting the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device. The report transmission method according to claim 5. **Claim 7** Instructing the terminal device about the mapping relationship between the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service and the identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service includes: Receiving the second mapping relationship transmitted from the target base station; Transmitting the second mapping relationship and the first mapping relationship to the terminal device, where the first mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes the mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for instructing the terminal device about the mapping relationship between the identifier of the first MRB and the identifier of the second MRB. The report transmission method according to claim 5.

8. A determination module configured to determine an identifier of a second multicast broadcast system radio bearer (MRB) set by a source base station for a quality of service flow (QoS Flow) of a target multicast broadcast system (MBS) service based on an identifier of a first MRB set by a target base station for the QoS Flow of the target MBS service; A transmission module configured to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via a packet data convergence protocol (PDCP) entity corresponding to the identifier of the second MRB, characterized by comprising: A report transmission device.

9. The fact that the transmission module is configured to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via a PDCP entity corresponding to the identifier of the second MRB means that: The transmission module is configured to receive the QoS Flow of the target MBS service via a PDCP entity corresponding to the identifier of the second MRB; and The transmission module is configured to transmit a PDCP status report generated by a PDCP entity corresponding to the identifier of the second MRB to the target base station, the PDCP status report including QoS Flow transmission information of the target MBS service, characterized by comprising: The report transmission device according to claim 8.

10. Further comprising a first receiving module configured to receive a mapping relationship between an identifier of a first MRB set by a target base station and an identifier of a second MRB set by the source base station, transmitted from the source base station. The determination module is configured to determine an identifier of a second multi-cast broadcast system radio bearer (MRB) set by a source base station for a quality of service data flow (QoS Flow) of a target multi-cast broadcast system (MBS) service based on an identifier of a first MRB set by the target base station for the QoS Flow of the target MBS service. The determination module is configured to determine an identifier of a second MRB set by a source base station for a QoS Flow of the target MBS service based on the mapping relationship and the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service. The report transmission device according to claim 8 or 9. **Claim 11** A second receiving module configured to receive a first mapping relationship and a second mapping relationship transmitted from the source base station, where the first mapping relationship includes a mapping relationship between a QoS Flow of the target MBS service and an identifier of a second MRB set by the source base station, the second mapping relationship includes a mapping relationship between a QoS Flow of the target MBS service and an identifier of a first MRB set by the target base station, and the second mapping relationship further includes a second receiving module transmitted by the target base station to the source base station. The determination module is configured to determine a mapping relationship between the identifier of the first MRB and the identifier of the second MRB based on the first mapping relationship and the second mapping relationship. The determination module is configured to determine an identifier of a second multi-cast broadcast system radio bearer (MRB) set by a source base station for a quality of service data flow (QoS Flow) of a target multi-cast broadcast system (MBS) service based on an identifier of a first MRB set by the target base station for the QoS Flow of the target MBS service. The determination module is configured to determine an identifier of a second MRB set by a source base station for a QoS Flow of the target MBS service based on a mapping relationship between an identifier of the first MRB and an identifier of the second MRB, and an identifier of the first MRB set by a target base station for the QoS Flow of the target MBS service, characterized by including this. The report transmission device according to claim 8 or 9.

12. including an instruction module configured to instruct a terminal device of a mapping relationship between an identifier of a first MRB set by a target base station for a QoS Flow of a target MBS service and an identifier of a second MRB set by a source base station for the QoS Flow of the target MBS service, wherein the mapping relationship between the identifier of the first MRB and the identifier of the second MRB is used to determine, based on the identifier of the first MRB set by the target base station for the QoS Flow of the target MBS service, an identifier of the second MRB set by the source base station for the QoS Flow of the target MBS service, and to instruct the terminal device to transmit a PDCP status report for the QoS Flow of the target MBS service to the target base station via a PDCP entity corresponding to the identifier of the second MRB, characterized by this. Report transmission device.

13. The fact that the instruction module is configured to instruct a terminal device of a mapping relationship between an identifier of a first MRB set by a target base station for a QoS Flow of a target MBS service and an identifier of a second MRB set by a source base station for the QoS Flow of the target MBS service is the instruction module is configured to receive a mapping relationship between the identifier of the first MRB and the identifier of the second MRB transmitted from the target base station; the instruction module is configured to transmit the mapping relationship between the identifier of the first MRB and the identifier of the second MRB to the terminal device, characterized by including this. The report transmission device according to claim 12.

14. The indication module is configured to indicate to the terminal device a mapping relationship between an identifier of a first MRB set by the target base station for a QoS Flow of a target MBS service and an identifier of a second MRB set by the source base station for the QoS Flow of the target MBS service, The indication module is configured to receive a second mapping relationship transmitted from the target base station, The indication module includes being configured to transmit the second mapping relationship and the first mapping relationship to the terminal device, wherein the first mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the second MRB, the second mapping relationship includes a mapping relationship between the QoS Flow of the target MBS service and the identifier of the first MRB, and the second mapping relationship and the first mapping relationship are for indicating to the terminal device a mapping relationship between the identifier of the first MRB and the identifier of the second MRB. The report transmission device according to claim 12.

15. A processor-readable storage medium, characterized in that a computer program for causing a processor to execute the method according to any one of claims 1 to 7 is stored therein.

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