Wireless communication method and apparatus for multicast / broadcast service

Abstract

The invention discloses a wireless communication method and a wireless communication device for a multicast / broadcast service (MBS), and the wireless communication method and the wireless communication device are used for the MBS. In one embodiment, the method is performed by a user equipment (UE), comprising providing assistance information to a base station for an MBS session, enabling the UE to receive MBS content in a radio resource control (RRC) inactive state, where the assistance information comprises UE capabilities and / or UE preferences.

Description

Technical Field

[0001] The present application relates to the field of wireless communication systems, and more specifically, to a wireless communication method and apparatus for multicast / broadcast service (MBS), for example, particularly to an MBS system. Background Art

[0002] In 3rd generation partnership project (3GPP) cellular networks, broadcast and multicast services can be delivered via a transport service called multimedia broadcast / multicast service (MBMS). A broadcast multicast service center (BM-SC) server is responsible for distributing media content to a group of subscribed users. When user equipment (UE) moves out of the network coverage, the UE may not be able to use MBMS because it can no longer establish uplink and downlink connections with the BM-SC server. MBMS is a point-to-multipoint (PTM) interface specification designed to efficiently provide broadcast and multicast services in 3GPP cellular networks. Examples of MBMS interface specifications include those described in the universal mobile telecommunication system (UMTS) and long term evolution (LTE) communication specifications. For broadcast transmissions across multiple cells, these specifications define transmissions in a single frequency network configuration. Typical applications of MBMS include mobile TV, news, radio stations, file transfers, emergency alerts, etc. When MBMS broadcasts a service, all cells within a multimedia broadcast / multicast service single frequency network (MBSFN) area will transmit the same MBMS service.

[0003] Users can access these services and obtain MBMS content through wireless communication devices (such as cellular phones, tablets, laptops, and other devices with wireless transceivers). These devices receive services by communicating with base stations in the communication system. The base stations provide wireless services to wireless communication devices (sometimes called mobile devices or UEs) located within the cell range. Users can access at least some multimedia services through UEs using point-to-point (PTP) connections or PTM transmissions. In 3GPP systems, PTP services can be provided through unicast technology, while PTM transmissions can be provided through MBMS communications and can be transmitted through MBSFN or single cell point to multipoint (SC-PTM) communications. In systems that comply with a revision of the 3GPP LTE communication specifications, MBMS can be provided through enhanced MBMS (eMBMS). Therefore, in LTE systems, MBMS services can be provided through unicast services, MBSFN, or SC-PTM.

[0004] In order to achieve resource-efficient multicast / broadcast service transmission, 3GPP developed NR broadcast / multicast under work item (WID) in Rel-17, aiming to support general MBS services on 5GS. The identified applicable scenarios include public safety and mission-critical communications, vehicle-to-everything (V2X) applications, IPTV, live video, wireless software transmission, Internet of Things (IoT) applications, etc. Rel-17 MBS has identified two transmission modes, where transmission mode 1 (only for multicast) can meet higher QoS service requirements, while transmission mode 2 (only for broadcast) focuses on lower QoS services. Given that Rel-17 MBS has provided basic functions to support MBS services, the main goal of Rel-18 should be to optimize the deployment of MBS, such as improving resource efficiency and capacity based on Rel-17 MBS.

[0005] In Rel-17, the Radio Access Network (RAN) only specifies that UEs in the RRC_CONNECTED state support multicast, which may not fully meet the needs of, for example, mission-critical services, especially for cells with a large number of UEs (see TR23.774). In addition, always keeping the UE in the RRC_CONNECTED state is not in line with power consumption optimization. Therefore, it is very important to support multicast for UEs in the RRC_INACTIVE state.

[0006] Therefore, there is an urgent need for a wireless communication method and apparatus for multicast / broadcast service (MBS). Summary of the invention

[0007] The purpose of the present application is to propose a wireless communication method and apparatus for multicast / broadcast service (MBS).

[0008] In a first aspect of the present application, a wireless communication method for multicast / broadcast service (MBS) is performed by a user equipment (UE), comprising: providing auxiliary information to a base station to allow the UE to receive MBS content of an MBS session in an inactive radio resource control (RRC) state, wherein the auxiliary information includes UE capabilities and / or UE preferences.

[0009] In a second aspect of the present application, a user equipment (UE) includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to execute the above method.

[0010] In a third aspect of the present application, a non-transitory machine-readable storage medium stores instructions, which, when executed by a computer, cause the computer to perform the above method.

[0011] In a fourth aspect of the present application, a chip includes a processor configured to call and run a computer program stored in a memory so that a device having the chip installed therein executes the above method.

[0012] In a fifth aspect of the present application, a computer readable storage medium stores a computer program, which enables a computer to execute the above method.

[0013] In a sixth aspect of the present application, a computer program product comprises a computer program, which enables a computer to execute the above method.

[0014] In a seventh aspect of the present application, a computer program enables a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or related technologies, the following briefly introduces the drawings to be described in the embodiments. Obviously, the drawings are only some embodiments of the present application, and ordinary technicians in this field can obtain other drawings based on these drawings without paying any price.

[0016] Figure 1This is a block diagram of one or more user equipment (UE) communicating with a base station (e.g., gNB) in a communication network system according to an embodiment of the present application.

[0017] Figure 2 It is a flowchart of a wireless communication method for MBS performed by a UE according to an embodiment of the present application.

[0018] Figure 3 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0019] Figure 4 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0020] Figure 5 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0021] Figure 6 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0022] Figure 7 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0023] Figure 8 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0024] Fig. 9 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0025] Fig.10 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0026] Fig.11 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0027] Fig.12 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0028] Fig.13 is a flowchart of a wireless communication method for MBS according to an embodiment of the present application.

[0029] Fig.14 is a system block diagram for wireless communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] The following is a detailed description of the technical content, structural features, objectives and effects of the present application in conjunction with the accompanying drawings. Specifically, the terms in the embodiments of the present application are only used to describe the purpose of specific embodiments, and are not intended to limit the present application.

[0031] At the RANP#94 meeting, the following R18 WID was approved. This work item aims to further enhance NR multicast / broadcast capabilities based on Rel-17 MBS. The objectives of Rel-18 include: 1. Specification of support for multicast reception by UEs in RRC_INACTIVE state [RAN2, RAN3]. Specification of PTM configuration for UEs receiving multicast in RRC_INACTIVE state [RAN2]. Study of the impact of UEs receiving multicast in RRC_INACTIVE state on mobility and state transitions [RAN2, RAN3]. 2. Specification of Uu signaling enhancements to enable UEs to share processing capabilities for MBS broadcast and unicast reception, including: UE capability and related auxiliary information reporting to indicate whether unicast reception and MBS broadcast reception in RRC_CONNECTED state are from the same operator or different operators [RAN2]. 3. Study and, if necessary, specify resource efficiency optimization for MBS reception in RAN sharing scenarios [RAN3].

[0032] In order to provide MBS services to more UEs in a cell, the RAN may enable UEs in an MBS multicast session to receive MBS session data in the RRC_INACTIVE state. This means that in the same cell and in the same MBS multicast session, some UEs may be in the RRC_INACTIVE state while others may be in the RRC_CONNECTED state. It is assumed that the network (NW) can select which UEs receive data in the RRC_INACTIVE state and which UEs receive data in the RRC_CONNECTED state, and can switch UEs between the two states during the multicast service reception, as described in the agreement reached by the RAN. It is assumed that the network can select which UEs are in the RRC_INACTIVE state and which UEs are in the RRC_CONNECTED state, and can switch UEs between the two states during the multicast service reception. On the other hand, RAN2 has also determined that it is up to the gNB to decide whether a multicast session can be received by a UE in the RRC_INACTIVE state. As for what information the gNB needs to obtain to make this decision (the relevant discussion is carried out in SA2), it remains to be further clarified. As mentioned above, the RRC state of a UE when receiving multicast services is affected by two factors: whether a certain multicast session can be received by a UE in the RRC_INACTIVE state. The network selects which UEs are in the RRC_INACTIVE state and which UEs are in the RRC_CONNECTED state. In this application, we use "Transmission Mode" to describe the RRC state of a UE when receiving multicast services, covering the above two factors. Therefore, the transmission mode is determined by the gNB. However, the gNB may need some auxiliary information to make this decision, which may come from the 5GC side, the UE side, or both. Several schemes have been discussed so far, involving how the UE provides auxiliary information to the gNB to help the gNB determine the transmission mode. In this application, we focus on one of the schemes, that is, the UE provides auxiliary information to the gNB by performing a registration procedure. The question we want to solve is: What factors cause the UE's initial preference (one of the auxiliary information provided by the UE to the gNB) to change? What process should be performed when the UE preference changes?

[0033] In some embodiments of this application, we focus on the UE side and discuss how and what MBS assistance information the UE should provide to the radio access network (RAN) to support the UE to receive MBS content in the RRC inactive state. This application consists of two parts. The first part discusses what information the UE needs to report to the gNB to assist the gNB in ​​determining the transmission mode. The second part discusses the message types that can be used to transmit UE reports.

[0034] Figure 1One or more user equipment (UE) 10 and a base station (e.g., gNB) 20 for communication in a communication network system 40 according to one embodiment of the present application are described. The communication network system 40 includes one or more UEs 10 and base stations 20. One or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to perform the functions, processes, and / or methods described in the present application. The various layers of the wireless interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 for storing various information to support the operation of the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21 for sending and / or receiving wireless signals.

[0035] The processor 11 or 21 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices. The memory 12 or 22 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and / or other storage devices. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When the embodiment is implemented in software, the technology described herein may use modules (such as procedures, functions, etc.) to perform the functions. These modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be integrated inside the processor 11 or 21, or may be located outside the processor 11 or 21. When the memory is located outside the processor, it can be communicated with the processor 11 or 21 through various known communication methods.

[0036] In some embodiments, the processor 11 is configured to provide auxiliary information to the base station to support the MBS session, so as to allow the UE to receive MBS content of the MBS session in a radio resource control (RRC) inactive state, wherein the auxiliary information includes UE capabilities and / or UE preferences. In some embodiments, the MBS refers to multicast.

[0037] Figure 2The present invention is a flowchart of a wireless communication method 200 for multicast / broadcast service (MBS) performed by a user equipment (UE) according to an embodiment of the present application. In some embodiments, the wireless communication method 200 for MBS performed by the UE includes: step 202: providing auxiliary information to a base station to support an MBS session, so as to allow the UE to receive MBS content of the MBS session in an inactive state of radio resource control (RRC), wherein the auxiliary information includes UE capabilities and / or UE preferences. In some embodiments, MBS refers to multicast.

[0038] In some embodiments, the UE provides the auxiliary information to the base station through at least one of the following or a combination thereof: a UE registration process; a UE auxiliary information reporting process; a UE capability information reporting process; an MBS interest indication process; and a small data transmission process. In some embodiments, during the UE registration process, the UE informs the base station of the UE capabilities and / or UE preferences so that the base station can make a decision based on the UE capabilities and / or UE preferences, which involves, for a multicast service, whether the UE receives the multicast service in an RRC connected state or in an RRC inactive state. In some embodiments, during the UE registration process, the UE indicates that it can receive MBS multicast using a transmission mode in an RRC inactive state, and / or the UE indicates its connection state preference for wishing to receive an MBS session. In some embodiments, the UE capabilities and / or UE preferences are transmitted via an uplink message, which includes: an RRC establishment request; an RRC establishment completion including a registration request; an uplink information transmission including an identity response; an uplink information transmission including an authentication response; an uplink information transmission including a security mode completion; a security mode completion; or an RRC reconfiguration completion.

[0039] In some embodiments, during the UE assistance information reporting process, when the UE reports the UE assistance information message, the UE receives an indication from the base station in the RRC reconfiguration message. In some embodiments, the UE capability and / or UE preference for supporting multicast reception is added to the inactive related information element of the UE assistance information message. In some embodiments, during the UE capability information reporting process, when the UE reports the UE capability information message, the UE receives an indication from the base station in the UE capability inquiry message. In some embodiments, the UE capability and / or UE preference for supporting multicast reception is added to the inactive related information element of the UE capability information message.

[0040] In some embodiments, the MBS interest indication procedure is used to notify the base station that the UE is receiving or interested in receiving MBS broadcast services when it is in the RRC connected state, and to inform the base station about the priority between MBS broadcast and unicast and multicast MRB reception. In some embodiments, when the UE is in the RRC connected state, the UE triggers the MBS interest indication procedure in the following situations: after successfully establishing / restoring the connection; when entering or leaving the broadcast service area; when the MBS broadcast session starts or stops; when the interest changes; when the priority between MBS broadcast reception and unicast / multicast reception changes; when the PCell broadcast SIB21 changes; when the SCell's SIB20 is received through dedicated signaling; when a handover occurs. In some embodiments, the UE capability and / or UE preference for supporting multicast reception is added to the inactive related information element of the MBS interest indication message.

[0041] In some embodiments, during the small data transmission process, the UE transmits auxiliary information to the base station without entering the RRC connected state. In some embodiments, when the UE is in the RRC inactive state and wishes to transmit auxiliary information to the base station, the UE triggers the small data transmission process and sends the auxiliary information during the small data transmission process.

[0042] Auxiliary information provided by UE to gNB for transmission mode determination:

[0043] The UE can provide two types of information: UE capabilities and UE preferences.

[0044] UE capabilities:

[0045] The applicability of the receive transmission mode in RRC inactive state depends on several factors. One important factor is whether the UE has the ability to receive multicast services in RRC inactive state. A typical issue is backward compatibility. Some UEs support Rel-17 MBS but cannot receive 5 MBS data in RRC inactive state. If such UEs join an MBS multicast session and are located in a cell, the MBS data needs to be transmitted in RRC connected state using Rel-17 transmission mode. Therefore, the first type of information that the UE needs to report to the gNB is the UE capability.

[0046] UE Preferences:

[0047] The second type of information that the UE can report is the UE preference. The UE may prefer to receive MBS data in RRC Inactive state to reduce battery consumption, or in RRC Connected state to improve service quality. Therefore, the UE can report its preference to the gNB to assist the gNB in ​​making a decision. If the UE indicates that it does not want to receive in RRC Inactive state, and the NG-RAN follows the UE preference, the number of UEs that can receive MBS sessions in a cell will be more limited, but the reliability of the transmission will be improved.

[0048] Message used by UE to transmit assistance information to gNB:

[0049] The UE can transmit UE reports through five messages / procedures. The auxiliary information can be transmitted through any one or a combination of the following.

[0050] During UE registration:

[0051] Figure 3 It is described that in some embodiments, during the UE registration procedure, the UE may indicate its capability to receive MBS multicast using the transmission mode in the RRC inactive state. The UE may also indicate its preference as to the connection state in which it wishes to receive MBS sessions. The standard for the UE registration procedure is defined in the TS 23.502 specification (e.g., the Initial UE Attach procedure). In theory, the UE capabilities and UE preferences may be transmitted in any uplink message sent by the UE to the gNB, such as: RRC SETUP REQUEST; RRC SETUP COMPLETE including REGISTRATION REQUEST; ULTRA LINK INFORMATION TRANSMISSION including IDENTITY RESPONSE; INITIAL CONTEXT SETUP REQUEST; SECURITY MODE COMPLETE; or RRC RECONFIGURATION COMPLETE.

[0052] UE assistance information:

[0053] UE Assistance Information message is used to indicate UE assistance information to the network. Figure 4 , the steps of the process are as follows: During the UE assistance information reporting procedure, the gNB may send an indication in the RRC reconfiguration message to request the UE to include inactive related information about the capability to support multicast reception when reporting UE assistance information.

[0054] If an inactive related information element about the UE capability to support multicast reception is added to the UE assistance information message, the ASN.1 shall contain the UE capability.

[0055] UE capability information:

[0056] The UE reports UE capability information to the gNB in ​​two ways. The first way is during the UE initial attachment process, during which the UE reports some important UE capability information, such as the network capabilities supported by the UE. This process belongs to the NAS (non-access layer protocol) process. The second way is the UE capability query and report process. This process is as follows: Figure 5 shown.

[0057] When the network needs to obtain the radio access capability information of the UE, the network will initiate the process to the UE in the RRC connected state.

[0058] Please refer to Figure 6 , during the UE capability information reporting procedure, the gNB may send an indication in the UE capability query message to request the UE to include inactive related information about the capability to support multicast reception when reporting the UE capability information.

[0059] The current UE capability information ASN.1 specification is defined in the TS 38.331 standard.

[0060] If an inactive related information element about the UE capability to support multicast reception is added to the UE Capability Information message, the ASN.1 shall contain the UE capability.

[0061] MBS Indication of Interest:

[0062] In Rel-17, the MBS interest indication process is as follows: Figure 7 shown.

[0063] The purpose of this procedure is to inform the network that the UE is receiving or interested in receiving MBS broadcast services when it is in RRC connected state, and to report to the network the priority between MBS broadcast and unicast / multicast MRB reception.

[0064] A UE supporting MBS may trigger this process in the following situations in the RRC connected state, including: after successfully establishing / restoring a connection; when entering or leaving a broadcast service area; when an MBS broadcast session starts or stops; when interests change; when the priority between MBS broadcast reception and unicast / multicast reception changes; when PCell broadcast SIB21 changes; when SIB20 of SCell is received through dedicated signaling; and when a handover occurs.

[0065] Information related to the UE's capability of supporting multicast reception may be added to the MBS interest indication message.

[0066] If the MBS interest indication message adds an element of information related to the UE's capability to support multicast reception, the ASN.1 will include the UE capability.

[0067] Small Data Transmission (SDT) process:

[0068] The above three methods all require the UE to be in the RRC connected state to transmit auxiliary information to the gNB. This section will discuss a method that can be transmitted without entering the RRC connected state.

[0069] NR Small Data Transmission (SDT) was introduced and standardized in R17. The main motivations for introducing this work item (WI) are as follows:

[0070] NR supports RRC Inactive state, and UEs with infrequent (periodic or aperiodic) data transmission are usually kept in RRC Inactive state by the network. Until Rel-16, RRC Inactive state did not support data transmission. Therefore, the UE needs to restore the connection (i.e. enter RRC Connected state) to transmit any downlink (MT) or uplink (MO) data. Even for extremely small and infrequent data packets, each transmission still requires the connection to be established and then released back to the Inactive state. This leads to unnecessary power consumption and signaling overhead.

[0071] Therefore, relevant information can be regarded as small data and transmitted during the SDT process.

[0072] The existing SDT processes are as follows: 4-step RA-SDT, 2-step RA-SDT and CG-SDT processes, respectively. Figure 8 , Fig. 9 and Fig.10 shown.

[0073] In some embodiments, when the UE is in the RRC inactive state and wishes to transmit auxiliary information to the gNB, the UE may trigger an SDT process and transmit the auxiliary information during the SDT process, such as Fig.11 , Fig.12 and Fig.13 shown.

[0074] In summary, in some embodiments of this application, we focus on the UE side and discuss how and what MBS assistance information the UE should provide to the RAN to support the UE to receive MBS content in the RRC inactive state. This application consists of two parts. The first part discusses what information the UE reports to the gNB to assist the gNB in ​​determining the transmission mode. The second part discusses which messages can be used to transmit UE reports. This is a new requirement introduced in R18 MBS, and there is no such requirement in previous versions.

[0075] Fig.147 is a block diagram of an exemplary wireless communication system 700 according to an embodiment of the present application. The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. Fig.14 A system 700 is shown, which includes a radio frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory / storage device 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are coupled to each other at least as shown. The application circuit 730 may include circuits, such as but not limited to one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors, such as a graphics processor, an application processor. The processor may be coupled to a memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems to run on the system.

[0076] While the present disclosure has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. A wireless communication method for a multicast / broadcast service MBS, performed by a user equipment UE, characterized in that: include: The auxiliary information is provided to the base station to allow the UE to receive the MBS content of the MBS session in a radio resource control (RRC) inactive state, wherein the auxiliary information includes UE capability and / or UE preference.

2. The wireless communication method according to claim 1, characterized in that: MBS refers to Multicast.

3. The wireless communication method according to claim 1 or 2, characterized in that: The UE provides the auxiliary information to the base station by at least one of the following or a combination thereof: UE registration process; UE assistance information reporting process; UE capability information reporting process; MBS Indication of Interest process; and Small data transfer process.

4. The wireless communication method according to claim 2 or 3, characterized in that: In the UE registration process, the UE indicates receiving MBS multicast using the transmission mode in the RRC inactive state, and / or the UE indicates a preference for a connection state in which an MBS session is desired to be received.

5. The wireless communication method according to claim 3 or 4, characterized in that: During the UE registration process, the UE informs the base station of the UE capabilities and / or the UE preferences so that the base station makes a decision based on the UE capabilities and / or the UE preferences, wherein the decision involves whether the UE receives the multicast service in the RRC connected state or in the RRC inactive state for the multicast service.

6. The wireless communication method according to any one of claims 2 to 5, characterized in that: The UE capability and / or the UE preference are transmitted in an uplink message, and the uplink message includes an RRC establishment request, an RRC establishment completion including a registration request, an uplink information transmission including an identity response, an uplink information transmission including an authentication response, an uplink information transmission including a security mode completion, a security mode completion, or an RRC reconfiguration completion.

7. The wireless communication method according to any one of claims 2 to 6, characterized in that: In the UE assistance information reporting process, when the UE reports the UE assistance information message, the UE receives an indication from the base station in an RRC reconfiguration message.

8. The wireless communication method according to claim 7, characterized in that: The UE capability and / or the UE preference regarding supporting multicast reception in the RRC inactive state is added to the inactivity related information element IE of the UE assistance information message.

9. The wireless communication method according to any one of claims 2 to 8, characterized in that: In the UE capability information reporting process, when the UE reports a UE capability information message, the UE receives an indication from the base station in a UE capability inquiry message.

10. The wireless communication method according to claim 9, characterized in that: The UE capability and / or the UE preference regarding supporting multicast reception in the RRC inactive state is added to the Inactive Related Information Element IE of the UE Capability Information message.

11. The wireless communication method according to any one of claims 2 to 10, characterized in that: The MBS interest indication procedure is used to notify the base station that the UE is receiving or is interested in receiving an MBS broadcast service in an RRC connected state, and to notify the base station about the priority between MBS broadcast and unicast and multicast MRB reception.

12. The wireless communication method according to claim 11, characterized in that: The UE starts the MBS interest indication process after successfully establishing / restoring the connection, entering or leaving the broadcast service area, when the MBS broadcast session starts or stops, when the interest changes, when the priority between MBS broadcast reception and unicast / multicast reception changes, when the PCell broadcast SIB21 changes, when the SIB20 of the SCell is received through dedicated signaling, or when switching.

13. The wireless communication method according to claim 11 or 12, characterized in that: The UE capability and / or the UE preference regarding supporting multicast reception in the RRC inactive state is added to the inactivity related information element IE of the MBS interest indication message.

14. The wireless communication method according to any one of claims 2 to 13, characterized in that: In the small data transmission process, the UE transmits the auxiliary information to the base station without entering an RRC connected state.

15. The wireless communication method according to any one of claims 2 to 14, characterized in that: When the UE wishes to transmit the auxiliary information to the base station in the RRC inactive state, the UE triggers the small data transmission process, and the auxiliary information is transmitted in the small data transmission process.

16. A user equipment, characterized in that: include: Memory; Transceiver; as well as a processor connected to the memory and the transceiver; The processor is configured to execute the method according to any one of claims 1 to 15.

17. A non-transitory machine-readable storage medium, characterized in that Instructions are stored which, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 15.

18. A chip, characterized in that: include: The processor is configured to call and run the computer program stored in the memory so that the device on which the chip is installed executes the method according to any one of claims 1 to 15.

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

20. A computer program product, characterized in that It comprises a computer program causing a computer to execute the method according to any one of claims 1 to 15.

21. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 15.

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