MBS service indication method and device, terminal equipment, and network equipment

Abstract

An embodiment of the present application provides an indication method and apparatus for an MBS service, a terminal device, and a network device, the method comprising: the terminal device sends identification information of an MBS service to a network device, wherein the MBS service is an MBS service expected by the terminal device or an MBS service being received; wherein the identification information of the MBS service is used for configuration of a dedicated downlink bandwidth part BWP of the terminal device and / or the identification information of the MBS service is used for determining a target cell to be switched by the terminal device.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of mobile communication technology, and specifically to a method and apparatus for indicating a multicast broadcast service (MBS) service, a terminal device, and a network device. Background Art

[0002] In the Long Term Evolution (LTE) system, a cell has only one bandwidth (i.e., system bandwidth), and the terminal device will work on this bandwidth in the cell. Unlike the LTE system, in the New Radio (NR) system, after the terminal device enters the Radio Resource Control (RRC) connected state, the network side configures multiple dedicated bandwidth parts (BWP) for the terminal device, and the terminal device can switch between these dedicated BWPs in the RRC connected state.

[0003] In the NR system, broadcast MBS services are supported. The terminal device can receive broadcast MBS services in RRC idle state, RRC inactive state or RRC connected state. After the terminal device enters the RRC connected state from the RRC idle state or RRC inactive state, the network side is not clear about the MBS services previously received by the terminal device. If a dedicated BWP is configured for the terminal device in the current way, the terminal device will not be able to receive the MBS services normally. Summary of the invention

[0004] The embodiments of the present application provide a method and apparatus for indicating an MBS service, a terminal device, and a network device.

[0005] The MBS service indication method provided in the embodiment of the present application includes:

[0006] The terminal device sends identification information of the MBS service to the network device, where the MBS service is the MBS service expected by the terminal device or the MBS service being received;

[0007] The identification information of the MBS service is used for configuration of a dedicated downlink BWP of the terminal device and / or the identification information of the MBS service is used for determining a target cell to be switched by the terminal device.

[0008] The MBS service indication method provided in the embodiment of the present application includes:

[0009] The network device receives identification information of an MBS service sent by a terminal device, where the MBS service is an MBS service expected by the terminal device or an MBS service being received;

[0010] The identification information of the MBS service is used by the network device to configure a dedicated downlink BWP for the terminal device and / or the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device.

[0011] The MBS service indication device provided in the embodiment of the present application is applied to a terminal device, and the device includes:

[0012] A communication unit, configured to send identification information of an MBS service to a network device, wherein the MBS service is an MBS service expected by the terminal device or an MBS service being received;

[0013] Among them, the identification information of the MBS service is used for configuration of the dedicated downlink BWP of the terminal device and / or the identification information of the MBS service is used to determine the target cell to be switched by the terminal device.

[0014] The MBS service indication device provided in the embodiment of the present application is applied to a network device, and the device includes:

[0015] A communication unit, configured to receive identification information of an MBS service sent by a terminal device, wherein the MBS service is an MBS service desired by the terminal device or an MBS service being received;

[0016] The identification information of the MBS service is used by the network device to configure a dedicated downlink BWP for the terminal device and / or the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device.

[0017] The terminal device provided in the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned MBS service indication method.

[0018] The network device provided in the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned MBS service indication method.

[0019] The chip provided in the embodiment of the present application is used to implement the above-mentioned MBS service indication method.

[0020] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the above-mentioned MBS service indication method.

[0021] The computer-readable storage medium provided in the embodiment of the present application is used to store a computer program, and the computer program enables a computer to execute the above-mentioned MBS service indication method.

[0022] The computer program product provided in the embodiment of the present application includes computer program instructions, and the computer program instructions enable a computer to execute the above-mentioned MBS service indication method.

[0023] The computer program provided in the embodiment of the present application, when executed on a computer, enables the computer to execute the above-mentioned MBS service indication method.

[0024] Through the above technical solution, the terminal device indicates to the network device the identification information of the MBS service that the terminal device expects or is receiving, so that the network device can configure a reasonable dedicated downlink BWP for the terminal device and / or correctly select the target cell to be switched according to the identification information of the MBS service, thereby ensuring that the terminal device can normally receive the MBS service. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

[0027] Figure 2 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 1 ;

[0028] Figure 3 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 2 ;

[0029] Figure 4 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 3 ;

[0030] Figure 5 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 4 ;

[0031] Figure 6 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 5 ;

[0032] Figure 7 This is a schematic diagram of the structure of the MBS service indication device provided in the embodiment of the present application. Figure 1 ;

[0033] Figure 8 This is a schematic diagram of the structure of the MBS service indication device provided in the embodiment of the present application. Figure 2 ;

[0034] Fig. 9 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0035] Fig.10 is a schematic structural diagram of a chip according to an embodiment of the present application;

[0036] Fig.11 It is a schematic block diagram of a communication system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, 5G communication system or future communication system, etc.

[0039] For example, the communication system 100 used in the embodiment of the present application is as follows: Figure 1 As shown. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal 120 (or referred to as a communication terminal, terminal). The network device 110 may provide communication coverage for a specific geographical area, and may communicate with terminals located within the coverage area. Optionally, the network device 110 may be an evolved base station (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network-side device in a 5G network, or a network device in a future communication system, etc.

[0040] The communication system 100 also includes at least one terminal 120 located within the coverage of the network device 110. As used herein, "terminal" includes but is not limited to connecting via a wired line, such as via a Public Switched Telephone Networks (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as, for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and / or another terminal configured to receive / send communication signals; and / or an Internet of Things (IoT) device. A terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communications System (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communications capabilities; PDAs that may include radiotelephones, pagers, Internet / Intranet access, Web browsers, notepads, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. A terminal may refer to an access terminal, User Equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a 5G network, or a terminal in a future evolved PLMN, etc.

[0041] Optionally, the terminals 120 may perform device-to-device (D2D) communication.

[0042] Optionally, the 5G communication system or 5G network may also be referred to as a New Radio (NR) system or NR network.

[0043] Figure 1 One network device and two terminals are shown exemplarily. Optionally, the communication system 100 may include multiple network devices and each network device may include another number of terminals within its coverage area, which is not limited in the embodiments of the present application.

[0044] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0045] It should be understood that the device with communication function in the network / system in the embodiment of the present application can be referred to as a communication device. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal 120 with communication functions. The network device 110 and the terminal 120 may be the specific devices described above and will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as a network controller, a mobile management entity and other network entities, which is not limited in the embodiments of the present application.

[0046] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions related to the embodiments of the present application are described below.

[0048] With the pursuit of speed, latency, high-speed mobility, energy efficiency and the diversity and complexity of services in future life, the Third Generation Partnership Project (3GPP) rd The 3rd Generation Partnership Project (3GPP) international standard organization has begun to develop 5G. The main application scenarios of 5G are: enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC).

[0049] On the one hand, eMBB still aims at users to obtain multimedia content, services and data, and its demand is growing rapidly. On the other hand, since eMBB may be deployed in different scenarios, such as indoors, in urban areas, and in rural areas, its capabilities and requirements vary greatly, so it cannot be generalized and must be analyzed in detail in combination with specific deployment scenarios. Typical applications of URLLC include: industrial automation, power automation, remote medical operations (surgery), traffic safety, etc. Typical features of mMTC include: high connection density, small data volume, latency-insensitive services, low cost and long service life of modules, etc.

[0050] In the early days of NR deployment, complete NR coverage was difficult to obtain, so the typical network coverage was wide-area LTE coverage and NR island coverage. In addition, a large number of LTEs are deployed below 6GHz, and there is little spectrum below 6GHz available for 5G. Therefore, NR must study spectrum applications above 6GHz, but high-frequency bands have limited coverage and fast signal fading. At the same time, in order to protect mobile operators' early investments in LTE, a tight interworking working mode between LTE and NR was proposed.

[0051] RRC Status

[0052] In order to reduce air interface signaling and quickly restore wireless connections and data services, 5G defines a new Radio Resource Control (RRC) state, namely the RRC inactive (RRC_INACTIVE) state. This state is different from the RRC idle (RRC_IDLE) state and the RRC active (RRC_ACTIVE) state.

[0053] 1) RRC_IDLE state (abbreviated as idle state): Mobility is based on UE cell selection and reselection, paging is initiated by the core network (CN), and the paging area is configured by the CN. There is no UE context on the base station side and no RRC connection.

[0054] 2) RRC_CONNECTED state (referred to as connected state): There is an RRC connection, and UE context exists on the base station side and the UE side. The network side knows the location of the UE at the specific cell level. Mobility is mobility controlled by the network side. Unicast data can be transmitted between the UE and the base station.

[0055] 3) RRC_INACTIVE state (abbreviated as inactive state): Mobility is based on UE cell selection and reselection, there is a connection between CN and NR, the UE context exists on a certain base station, paging is triggered by RAN, and the RAN-based paging area is managed by RAN. The network side knows the UE location based on the RAN paging area level.

[0056] Multimedia Broadcast Multicast Service (MBMS)

[0057] MBMS is a technology that transmits data from one data source to multiple terminal devices by sharing network resources. While providing multimedia services, this technology can effectively utilize network resources and achieve broadcast and multicast of multimedia services at a higher rate (such as 256kbps).

[0058] Since MBMS spectrum efficiency is low, it is not enough to effectively carry and support the operation of mobile TV services. Therefore, in LTE, 3GPP explicitly proposed to enhance the support capability for downlink high-speed MBMS services and determined the design requirements for the physical layer and air interface.

[0059] 3GPP R9 introduced evolved MBMS (eMBMS) into LTE. eMBMS proposed the concept of Single Frequency Network (SFN), namely Multimedia Broadcast multicast service Single Frequency Network (MBSFN). MBSFN uses a unified frequency to send service data in all cells at the same time, but synchronization between cells must be guaranteed. This method can greatly improve the overall signal-to-noise ratio distribution of the cell, and the spectrum efficiency will also be greatly improved accordingly. eMBMS implements broadcast and multicast of services based on the IP multicast protocol.

[0060] In LTE or enhanced LTE (LTE-Advanced, LTE-A), MBMS has only a broadcast bearer mode, but no multicast bearer mode. In addition, the reception of MBMS services is applicable to terminal devices in an idle state or a connected state.

[0061] 3GPP R13 introduced the concept of Single Cell Point To Multipoint (SC-PTM), which is based on the MBMS network architecture.

[0062] MBMS introduces new logical channels, including Single Cell-Multicast Control Channel (SC-MCCH) and Single Cell-Multicast Transport Channel (SC-MTCH). SC-MCCH and SC-MTCH are mapped to Downlink Shared Channel (DL-SCH), and further, DL-SCH is mapped to Physical Downlink Shared Channel (PDSCH), where SC-MCCH and SC-MTCH are logical channels, DL-SCH is a transport channel, and PDSCH is a physical channel. SC-MCCH and SC-MTCH do not support Hybrid Automatic Repeat reQuest (HARQ) operation.

[0063] MBMS introduces a new type of System Information Block (SIB), namely SIB20. Specifically, the configuration information of SC-MCCH is transmitted through SIB20, and there is only one SC-MCCH in a cell. The configuration information of SC-MCCH includes: the modification period of SC-MCCH, the repetition period of SC-MCCH, and the radio frame and subframe for scheduling SC-MCCH. Further, 1) The boundary of the modification period of SC-MCCH satisfies SFN mod m = 0, where SFN represents the system frame number of the boundary, and m is the modification period of SC-MCCH configured in SIB20 (i.e., sc-mcch-ModificationPeriod). 2) The radio frame for scheduling SC-MCCH satisfies: SFN mod mcch-RepetitionPeriod = mcch-Offset, where SFN represents the system frame number of the radio frame, mcch-RepetitionPeriod represents the repetition period of SC-MCCH, and mcch-Offset represents the offset of SC-MCCH. 3) The subframe for scheduling SC-MCCH is indicated by sc-mcch-Subframe.

[0064] SC-MCCH is scheduled through the Physical Downlink Control Channel (PDCCH). On the one hand, a new Radio Network Temporary Identity (RNTI), namely the Single Cell RNTI (SC-RNTI), is introduced to identify the PDCCH (such as SC-MCCHPDCCH) used to schedule SC-MCCH. Optionally, the SC-RNTI is fixed to FFFC. On the other hand, a new RNTI, namely the Single Cell Notification RNTI (SC-N-RNTI), is introduced to identify the PDCCH (such as the notification PDCCH) used to indicate the change notification of SC-MCCH. Optionally, the SC-N-RNTI is fixed to FFFB; further, one of the 8 bits of DCI 1C can be used to indicate the change notification. In LTE, the configuration information of SC-PTM is based on the SC-MCCH configured by SIB20, and then the SC-MCCH configures the SC-MTCH, which is used to transmit service data.

[0065] Specifically, SC-MCCH only transmits one message (i.e., SCPTMConfiguration), which is used to configure the configuration information of SC-PTM. The configuration information of SC-PTM includes: Temporary Mobile Group Identity (TMGI), session id, group RNTI (G-RNTI), discontinuous reception (DRX) configuration information, and SC-PTM service information of neighboring cells. It should be noted that SC-PTM in R13 does not support the robust header compression (ROHC) function.

[0066] The downlink discontinuous reception of SC-PTM is controlled by the following parameters: onDurationTimerSCPTM, drx-InactivityTimerSCPTM, SC-MTCH-SchedulingCycle, and SC-MTCH-SchedulingOffset.

[0067] When [(SFN*10)+subframe number]modulo(SC-MTCH-SchedulingCycle)=SC-MTCH-SchedulingOffset is satisfied, the timer onDurationTimerSCPTM is started;

[0068] When receiving downlink PDCCH scheduling, start the timer drx-InactivityTimerSCPTM;

[0069] Downlink SC-PTM services are received only when the timer onDurationTimerSCPTM or drx-InactivityTimerSCPTM is running.

[0070] SC-PTM service continuity adopts the MBMS service continuity concept based on SIB15, namely the "SIB15+MBMSInterestIndication" mode. The service continuity of idle terminal devices is based on the concept of frequency priority.

[0071] According to the above description, the configuration of SC-PTM is based on SIB20 to configure SC-MCCH, and then configure SC-MTCH based on SC-MCCH. A cell has only one SC-MCCH, that is, after the terminal device reselects the cell, it needs to reacquire SC-MCCH, which will cause service interruption.

[0072] In the NR system, many scenarios need to support multicast and broadcast business requirements, such as the Internet of Vehicles and the Industrial Internet. Therefore, it is necessary to introduce MBMS in NR.

[0073] It should be noted that the MBMS service in the above solution includes but is not limited to multicast service, groupcast service, MBS service, etc. The embodiment of the present application takes the MBS service as an example for explanation, and the description of "MBS service" can also be replaced by "multicast service" or "groupcast service" or "broadcast service" or "MBMS service".

[0074] NR supports broadcast-type MBS services, MCCH is configured through BCCH, and MTCH is configured through MCCT. Among them, MCCH is used to transmit the configuration information of MBS services, and MTCH is used to transmit MBS service data. A cell has only one MCCH, which carries signaling (hereinafter referred to as MCCH signaling), and the configuration information of multiple MBS services is configured through MCCH signaling.

[0075] Terminal devices in RRC idle state, RRC inactive state, and RRC connected state can receive broadcast MBS services. In order to ensure the continuity of terminal devices in RRC connected state receiving broadcast MBS services, the terminal device needs to indicate the identification information of the MBS services that the terminal device is interested in or is receiving to the network side when in RRC connected state, so that the network side can give priority to the cell supporting the MBS service as the target cell for switching when making a switching decision.

[0076] In NR, unlike LTE, after the terminal device enters the RRC connected state, the network side configures multiple dedicated BWPs (such as up to 4 dedicated BWPs) for the terminal device. The terminal device can switch between these dedicated BWPs in the RRC connected state, for example, switching between BWPs is achieved based on mechanisms such as DCI or timers. The terminal device receives broadcast MBS services in the RRC idle state or the RRC inactive state. After entering the RRC connected state from the RRC idle state or the RRC inactive state, the network side is unclear about the MBS services previously received by the terminal device. If a dedicated BWP is configured for the terminal device in the current manner, the terminal device will not be able to receive the MBS services normally. To this end, the following technical solutions of the embodiments of the present application are proposed.

[0077] According to the technical solution of the embodiment of the present application, the terminal device reports the identification information of the MBS service that it is interested in or is receiving in the RRC idle state or the RRC inactive state, so as to facilitate the network side to configure a suitable dedicated BWP, avoid unnecessary BWP switching of the terminal device, and ensure the normal reception of the MBS service.

[0078] Figure 2 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 1 ,like Figure 2 As shown, the MBS service indication method includes the following steps:

[0079] Step 201: The terminal device sends identification information of the MBS service to the network device, and the network device receives the identification information of the MBS service sent by the terminal device, where the MBS service is the MBS service expected by the terminal device or the MBS service being received; wherein the identification information of the MBS service is used for the configuration of the dedicated downlink BWP of the terminal device and / or the identification information of the MBS service is used to determine the target cell to be switched by the terminal device.

[0080] In an embodiment of the present application, the identification information of the MBS service is used by the network device to configure a dedicated downlink BWP for the terminal device and / or the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device.

[0081] In an embodiment of the present application, the terminal device can receive the broadcast MBS service in the RRC idle state or the RRC inactive state or the RRC connected state. In the case where the terminal device receives the broadcast MBS service in the RRC idle state or the RRC inactive state, if the terminal device enters the RRC connected state from the RRC idle state or the RRC inactive state, the terminal device can send the identification information of the MBS service to the network device after entering the RRC connected state or during the process of entering the RRC connected state. The MBS service here refers to the MBS service that the terminal device expects or is receiving in the previous RRC idle state or the RRC inactive state, so that the network device can configure a dedicated downlink BWP for the terminal device and / or select a target cell to be switched for the terminal device according to the identification information of the MBS service indicated by the terminal device.

[0082] In the embodiment of the present application, the identification information of the MBS service may be but is not limited to TMGI, G-RNTI, etc.

[0083] In the embodiment of the present application, the description of “desired MBS service” may also be replaced by “MBS service of interest”.

[0084] The technical solutions of the embodiments of the present application are described in detail below in combination with different situations.

[0085] (I) Situation 1

[0086] After entering the RRC connection state, the terminal device sends the identification information of the MBS service to the network device through an RRC message.

[0087] Here, the RRC message can be an RRC message that has not been securely processed, or an RRC message that has been securely processed. It should be noted that the RRC message transmitted before the AS layer security activation is an RRC message that has not been securely processed, and the RRC message transmitted after the AS layer security activation is an RRC message that has been securely processed. Among them, the AS layer security activation is based on the security mode complete message as the judgment standard.

[0088] In one scenario, the MBS service is the MBS service that the terminal device expects or is receiving in the RRC idle state; before the terminal device enters the RRC connected state, the terminal device sends an RRC establishment request message to the network device, and the network device receives the RRC establishment request message sent by the terminal device; the network device sends an RRC establishment message to the terminal device, and the terminal device receives the RRC establishment message sent by the network device.

[0089] In another application scenario, the MBS service is the MBS service expected by the terminal device or the MBS service being received when the terminal device is in an RRC inactive state; before the terminal device enters the RRC connected state, the terminal device sends an RRC recovery request message to the network device, and the network device receives the RRC recovery request message sent by the terminal device; wherein the RRC recovery process falls back to the RRC establishment process; the network device sends an RRC establishment message to the terminal device, and the terminal device receives the RRC establishment message sent by the network device.

[0090] In an optional manner, the terminal device sends identification information of the MBS service to the network device through a first RRC message, and the network device receives the identification information of the MBS service sent by the terminal device through the first RRC message, and the first RRC message is an RRC message that has not been security processed. In one example, the first RRC message is an RRC setup complete message; or, the first RRC message is an MBS Interest Indication message.

[0091] In another optional manner, the terminal device sends identification information of the MBS service to the network device through a second RRC message, and the network device receives the identification information of the MBS service sent by the terminal device through the second RRC message, and the second RRC message is a security-processed RRC message. In one example, the second RRC message is a security activation complete message; or, the second RRC message is a UE assistance information UEAssistanceInformation message; or, the second RRC message is an MBS indication message, such as an MBS interest indication (MBSInterestingIndication) message.

[0092] In an embodiment of the present application, after the terminal device enters the RRC connected state, the network device sends an RRC reconfiguration message to the terminal device, and the terminal device receives the RRC reconfiguration message sent by the network device. The RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

[0093] (II) Situation 2

[0094] After entering the RRC connection state, the terminal device sends the identification information of the MBS service to the network device through an RRC message.

[0095] In one scenario, the MBS service is the MBS service that the terminal device expects or is receiving when the terminal device is in an RRC inactive state; before the terminal device enters the RRC connected state, the terminal device sends an RRC recovery request message to the network device, and the network device receives the RRC recovery request message sent by the terminal device; the network device sends an RRC recovery message to the terminal device, and the terminal device receives the RRC recovery message sent by the network device, and then the terminal device enters the RRC connected state. After the terminal device enters the RRC connected state, the terminal device sends the identification information of the MBS service to the network device through an RRC recovery completion message, and the network device receives the identification information of the MBS service sent by the terminal device through the RRC recovery completion message.

[0096] In the above solution, optionally, the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service. Here, the first indication information can be implemented in the following ways:

[0097] Method I) The RRC recovery request message carries the first indication information; wherein, the value of the idle bit in the RRC recovery request message is used to represent the first indication information.

[0098] Method II) The RRC recovery request message carries the first indication information; wherein, the value of the recovery reason in the RRC recovery request message is used to characterize the first indication information.

[0099] Method III) The value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

[0100] Here, the logical channel identifier of the CCCH is carried in the packet header corresponding to the RRC recovery request message in the MAC TB.

[0101] In the above scheme, optionally, the RRC recovery message carries second configuration information, and the second configuration information is used to determine the BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell. Here, the bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device. Specifically, the bandwidth of the MBS BWP of the PCell is the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

[0102] In an embodiment of the present application, after the terminal device sends an RRC recovery completion message to the network device, the network device sends an RRC reconfiguration message to the terminal device, and the terminal device receives the RRC reconfiguration message sent by the network device. The RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

[0103] (III) Situation 3

[0104] After entering the RRC connection state, the terminal device sends the identification information of the MBS service to the network device through an RRC message.

[0105] In one scenario, the MBS service is the MBS service that the terminal device expects or is receiving in an RRC inactive state; before the terminal device enters the RRC connected state, the terminal device sends an RRC recovery request message to the network device, and the network device receives the RRC recovery request message sent by the terminal device; the network device sends an RRC recovery message to the terminal device, and the terminal device receives the RRC recovery message sent by the network device, and then the terminal device enters the RRC connected state. After the terminal device enters the RRC connected state, the terminal device sends the identification information of the MBS service to the network device through an RRC recovery completion message.

[0106] In the above solution, optionally, the terminal device may send first indication information to the network device, where the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service.

[0107] In an optional manner, the RRC recovery request message is used to determine first indication information, where the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service. Here, the first indication information can be implemented in the following ways:

[0108] Method I) The RRC recovery request message carries the first indication information; wherein, the value of the idle bit in the RRC recovery request message is used to represent the first indication information.

[0109] Method II) The RRC recovery request message carries the first indication information; wherein, the value of the recovery reason in the RRC recovery request message is used to characterize the first indication information.

[0110] Method III) The value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

[0111] Here, the logical channel identifier of the CCCH is carried in the packet header corresponding to the RRC recovery request message in the MAC TB.

[0112] In another optional embodiment, before the terminal device sends an RRC recovery request message to the network device, the method also includes: the terminal device sends MSG1 or MSGA to the network device, and the network device receives MSG1 or MSGA sent by the terminal device, and the MSG1 or MSGA is used to determine first indication information, and the first indication information is used to indicate at least one of the following: whether the terminal device is receiving a broadcast MBS service; identification information of the MBS service being received by the terminal device.

[0113] In the above scheme, the preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with whether the terminal device is receiving a broadcasted MBS service; and / or, the preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device. Here, optionally, the association is configured through a system broadcast message. Based on this, the terminal device determines the preamble code and / or RO resource corresponding to the MSG1 or MSGA according to whether the terminal device is receiving a broadcasted MBS service and / or the identification information of the received MBS service.

[0114] In the above scheme, optionally, the RRC recovery message carries second configuration information, and the second configuration information is used to determine the BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell. Here, the bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device. Specifically, the bandwidth of the MBS BWP of the PCell is the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

[0115] In an embodiment of the present application, after the terminal device sends an RRC recovery completion message to the network device, the network device sends an RRC reconfiguration message to the terminal device, and the terminal device receives the RRC reconfiguration message sent by the network device. The RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

[0116] (IV) Situation 4

[0117] Before the terminal device enters the RRC connection state, it sends the identification information of the MBS service to the network device through MSG1 or MSGA; the network device receives the identification information of the MBS service sent by the terminal device through MSG1 or MSGA.

[0118] Specifically, the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following:

[0119] Whether the terminal device is receiving a broadcast MBS service;

[0120] The identification information of the MBS service being received by the terminal device.

[0121] In the above scheme, the preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with whether the terminal device is receiving a broadcasted MBS service; and / or, the preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device. Here, optionally, the association is configured through a system broadcast message. Based on this, the terminal device determines the preamble code and / or RO resource corresponding to the MSG1 or MSGA according to whether the terminal device is receiving a broadcasted MBS service and / or the identification information of the received MBS service.

[0122] In the above scheme, for MSGA, including MSG1 and Payload (Payload is carried in PUSCH), the first indication information can be implicitly indicated by the preamble code and / or RO resources of MSG1, or the first indication information can also be carried in the Payload as an explicit indication.

[0123] In one scenario, the MBS service is the MBS service that the terminal device expects or is receiving when the terminal device is in an RRC inactive state; before the terminal device enters the RRC connected state, the terminal device sends identification information of the MBS service to the network device through MSG1 or MSGA, and the terminal device receives MSG2 sent by the network device; then, the terminal device sends an RRC recovery request message to the network device, and the network device receives the RRC recovery request message sent by the terminal device; the network device sends an RRC recovery message to the terminal device, and the terminal device receives the RRC recovery message sent by the network device, the RRC recovery message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP; then, the terminal device enters the RRC connected state. After the terminal device enters the RRC connected state, the terminal device sends an RRC recovery completion message to the network device.

[0124] For the solutions described in Cases 1 to 4 above, the network device can obtain the identification information of the MBS service sent by the terminal device, and the network device can configure a dedicated downlink BWP for the terminal device and / or select a target cell to be switched for the terminal device based on the identification information of the MBS service.

[0125] Wherein, for handover, the identification information of the MBS service is used by the network device to select a cell supporting the MBS service indicated by the identification information of the MBS service as the target cell for handover. Specifically, the network device selects the cell supporting the MBS service indicated by the identification information of the MBS service as the target cell for handover according to the identification information of the MBS service. Further, optionally, before the network device selects the cell supporting the MBS service indicated by the identification information of the MBS service as the target cell for handover, the cell and its neighboring cells exchange identification information about the MBS service supported by each cell or the MBS service being transmitted.

[0126] For the dedicated downlink BWP, the configuration information of the dedicated downlink BWP is reflected by the first configuration information in the above solution. The first configuration information in the solutions described in the above situations 1 to 4 is described below.

[0127] A) In an optional manner, the first configuration information is used to determine configuration information of a dedicated downlink BWP of a PCell, and the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

[0128] B) In another optional manner, the first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

[0129] Optionally, the network device sends second indication information to the terminal device, and the terminal device receives the second indication information sent by the network device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

[0130] In one example, if the terminal device receives a broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

[0131] In one example, if the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behaviors: monitoring the PDCCH encrypted by G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH; not monitoring the PDCCH encrypted by C-RNTI on the SCell and not receiving the PDSCH corresponding to the PDCCH. Furthermore, the bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0132] It should be noted that the “MBS service identification information” described in the above solution of the present application may refer to the identification information of one MBS service or the identification information of multiple MBS services (ie, a list of MBS identification information).

[0133] The technical solution of the embodiment of the present application is illustrated below in combination with specific application examples. It should be noted that in the following application examples, the terminal device is taken as UE and the network device is taken as gNB.

[0134] Application Example 1

[0135] Application Example 1 corresponds to Case 1 in the above solution, refer to Figure 3 , Figure 3 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 2 ,like Figure 3 As shown, the MBS service indication method includes the following steps:

[0136] Step 301: The UE is in RRC idle state and is receiving a broadcast MBS service.

[0137] Here, the identification information of the broadcast MBS service is TMGI-1.

[0138] Step 302: The UE sends an RRC setup request (RRCSetupRequest) message to the gNB.

[0139] Here, the UE sends an RRC establishment request message to the gNB through SRB0.

[0140] Step 303: gNB sends an RRC Setup message to the UE.

[0141] Here, the gNB sends an RRC establishment message to the UE via SRB1.

[0142] Step 304: The UE enters the RRC connected state.

[0143] Step 305: The UE reports to the gNB the identification information of the MBS service that the UE is interested in or is receiving.

[0144] Here, the identification information of the MBS service that the UE is interested in or is receiving is, for example, TMGI-1.

[0145] It should be noted that the identification information of the MBS service that the UE is interested in or is receiving is not limited to one TMGI, but may also be a TMGI list.

[0146] In this embodiment of the present application, the UE reports the identification information of the MBS service that the UE is interested in or is receiving to the gNB in ​​the following ways:

[0147] Mode 1-1: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through an RRC Setup Complete message. Here, the RRC Setup Complete message (ie, MSG5) is transmitted through SRB1.

[0148] Mode 1-2: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through a new RRC message. Here, the new RRC message is, for example, an MBS Interest Indication message.

[0149] It should be noted that the above-mentioned method 1-1 and method 1-2 do not take security into consideration, that is, the RRC message carrying the identification information of the MBS service is not securely processed. Therefore, if there is no security issue, the above-mentioned method 1-1 or method 1-2 can be used to report the identification information of the MBS service.

[0150] Mode 2-1: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through a security activation completion (SecurityModeComplete) message.

[0151] Mode 2-2: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through a UE Assistance Information message.

[0152] Mode 2-3: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through a new RRC message. Here, the new RRC message is, for example, an MBS Interest Indication message.

[0153] It should be noted that the above-mentioned methods 2-1, 2-2 and 2-3 have taken security considerations into account, that is, the RRC message carrying the identification information of the MBS service is securely processed (that is, the RRC message is reported only after the AS layer is securely activated). Therefore, in the absence or presence of security issues, the above-mentioned method 2-1, method 2-2 or method 2-3 can be used to report the identification information of the MBS service.

[0154] Step 306: The gNB sends an RRCReconfiguration message to the UE, carrying the configuration information of the dedicated downlink BWP.

[0155] Here, after the gNB obtains the identification information of the MBS service that the UE is interested in or is receiving, it configures the configuration information of the dedicated downlink BWP through the RRC reconfiguration message, specifically:

[0156] When the gNB configures a dedicated DL BWP for the PCell for the UE, the bandwidth of the dedicated DL BWP includes the bandwidth of the initial DL BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell. Or,

[0157] The gNB can instruct the UE to receive MBS services on a certain SCell, and configure the bandwidth of the dedicated DL BWP of the Scell ​​to include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0158] Furthermore, if the UE receives broadcast MBS services on the SCell, the SCell cannot be deactivated and dormant BWP cannot be configured (i.e., the SCell cannot be in an activated state with sleep behavior). Alternatively, if the UE receives broadcast MBS services on the SCell, if the SCell is deactivated, or dormant BWP is configured and activated, the UE is only allowed to continue to monitor the G-RNTI-scrambled PDCCH and corresponding PDSCH reception in the cell, but cannot receive the C-RNTI-scrambled PDCCH and corresponding PDSCH reception. And the bandwidth of the first activated DL BWP of the SCell must include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0159] Step 307: The UE sends an RRCReconfigurationComplete message to the gNB.

[0160] Here, the UE sends an RRC reconfiguration complete message to the gNB via SRB1.

[0161] Application Example 2

[0162] Application Example 2 corresponds to Case 2 in the above solution, refer to Figure 4 , Figure 4 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 3 ,like Figure 4 As shown, the MBS service indication method includes the following steps:

[0163] Step 401: The UE is in an RRC inactive state and is receiving a broadcast MBS service.

[0164] Here, the identifier of the broadcast MBS service is TMGI-1.

[0165] Step 402: The UE sends an RRC resumption request (RRCResumeRequest) message to the target gNB, and the 1-bit indication information is used to indicate whether the UE is receiving MBS services.

[0166] Here, the UE sends an RRC recovery request message to the target gNB through SRB0.

[0167] Here, the RRC recovery request message is used to determine 1-bit indication information, and the 1-bit indication information is used to indicate whether the UE is receiving the MBS service. For example, the value of the 1-bit indication information is 1, which means that the UE is receiving the MBS service, and the value of the 1-bit indication information is 0, which means that the UE is not receiving the MBS service. There are several ways to implement the 1-bit indication information:

[0168] 1) The UE carries 1-bit indication information in the RRC recovery request message, for example, using a spare bit in the RRC recovery request message to indicate the 1-bit indication information.

[0169] 2) The UE indicates that it is receiving the broadcast MBS service through the LCID of the CCCH corresponding to the RRC recovery request message. For example, a new LCID is defined for the CCCH to indicate that the UE is receiving the broadcast MBS service when the UE initiates the RRC connection recovery. At this time, the LCID indicated in the corresponding packet header of the RLC PDU of the RRC recovery request message in the MAC TB is the newly defined LCID.

[0170] 3) The UE carries 1 bit of indication information in the RRC resume request message, for example, using the value of the resume cause (resume cause) in the RRC resume request message to indicate that the UE is receiving the broadcast MBS service.

[0171] Step 403: The target gNB sends an RRC recovery message to the UE, carrying the configuration information of the BWP of the PCell.

[0172] Here, the target gNB sends an RRC recovery message to the UE via SRB1.

[0173] Here, after the target gNB obtains the 1-bit indication information about the UE receiving the broadcast MBS service from the RRC recovery request message sent by the UE, it configures the BWP of the PCell for the UE through the RRC recovery (RRCResume) message. Specifically, the bandwidth of the first activated DL BWP of the PCell includes the bandwidth of the initial DL BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

[0174] It should be noted that the network side will not trigger the UE to perform a BWP switching operation before receiving 1-bit indication information of the MBS service that the UE is interested in or is receiving, at least for the PCell.

[0175] Step 404: The UE enters the RRC connected state.

[0176] Step 405: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through an RRC recovery complete (RRCResumeComplete) message.

[0177] Here, the UE sends an RRC recovery complete message via SRB1.

[0178] Step 406: The gNB sends an RRCReconfiguration message to the UE, carrying the configuration information of the dedicated downlink BWP.

[0179] Here, the gNB sends an RRC reconfiguration message to the UE via SRB1.

[0180] Here, after the gNB obtains the identification information of the MBS service that the UE is interested in or is receiving, it configures the configuration information of the dedicated downlink BWP through the RRC reconfiguration message, specifically:

[0181] When the gNB configures a dedicated DL BWP for the PCell for the UE, the bandwidth of the dedicated DL BWP includes the bandwidth of the initial DL BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell. Or,

[0182] The gNB can instruct the UE to receive MBS services on a certain SCell, and configure the bandwidth of the dedicated DL BWP of the Scell ​​to include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0183] Furthermore, if the UE receives broadcast MBS services on the SCell, the SCell cannot be deactivated and dormant BWP cannot be configured (i.e., the SCell cannot be in an activated state with sleep behavior). Alternatively, if the UE receives broadcast MBS services on the SCell, if the SCell is deactivated, or dormant BWP is configured and activated, the UE is only allowed to continue to monitor the G-RNTI-scrambled PDCCH and corresponding PDSCH reception in the cell, but cannot receive the C-RNTI-scrambled PDCCH and corresponding PDSCH reception. And the bandwidth of the first activated DL BWP of the SCell must include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0184] Step 407: The UE sends an RRCReconfigurationComplete message to the gNB.

[0185] Here, the UE sends an RRC reconfiguration complete message to the gNB via SRB1.

[0186] Application Example 3

[0187] Application Example 3 corresponds to Case 3 in the above solution, refer to Figure 5 , Figure 5 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 4 ,like Figure 5 As shown, the MBS service indication method includes the following steps:

[0188] Step 501: The UE is in an RRC inactive state and is receiving a broadcast MBS service.

[0189] Here, the identifier of the broadcast MBS service is TMGI-1.

[0190] Step 502: The UE receives a system broadcast message sent by the target gNB and configures the first association relationship and / or the second association relationship.

[0191] Here, "association relationship" can also be called "mapping relationship".

[0192] Here, the first association relationship is the association relationship between the preamble and / or RO (rach occasion) resources and whether the MBS service is in progress. The second association relationship is the association relationship between the preamble and / or RO (rach occasion) resources and the MBS service identifier (ie, the identifier information of the MBS service).

[0193] It should be noted that there is no order between the above steps 501 and 502.

[0194] Step 503: The UE sends MSG1 to the target gNB.

[0195] Here, the UE selects corresponding preamble and / or RO resources to send MSG1 according to whether the MBS service is currently being received and / or identification information of the received MBS service.

[0196] Step 504: The target gNB determines whether the UE is receiving the MBS service and / or the identification information of the MBS service being received based on the preamble and / or RO resources of MSG1.

[0197] Step 505: The target gNB sends MSG2 to the UE.

[0198] Step 506: The UE sends an RRC recovery request (RRCResumeRequest) message to the target gNB.

[0199] Here, the UE sends an RRC recovery request message to the target gNB through SRB0.

[0200] Step 507: The target gNB sends an RRC recovery message to the UE, carrying the configuration information of the BWP of the PCell.

[0201] Here, the target gNB sends an RRC recovery message to the UE via SRB1.

[0202] Here, after the target gNB obtains the 1-bit indication information about the UE receiving the broadcast MBS service from the RRC recovery request message sent by the UE, it configures the BWP of the PCell for the UE through the RRC recovery (RRCResume) message. Specifically, the bandwidth of the first activated DL BWP of the PCell includes the bandwidth of the initial DL BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

[0203] It should be noted that the network side will not trigger the UE to perform a BWP switching operation before receiving 1-bit indication information of the MBS service that the UE is interested in or is receiving, at least for the PCell.

[0204] Step 508: The UE enters the RRC connected state.

[0205] Step 509: The UE reports the identification information of the MBS service that the UE is interested in or is receiving through an RRC resume complete (RRCResumeComplete) message.

[0206] Here, the UE sends an RRC recovery complete message via SRB1.

[0207] Step 510: The gNB sends an RRCReconfiguration message to the UE, carrying the configuration information of the dedicated downlink BWP.

[0208] Here, the gNB sends an RRC reconfiguration message to the UE via SRB1.

[0209] Here, after the gNB obtains the identification information of the MBS service that the UE is interested in or is receiving, it configures the configuration information of the dedicated downlink BWP through the RRC reconfiguration message, specifically:

[0210] When the gNB configures a dedicated DL BWP for the PCell for the UE, the bandwidth of the dedicated DL BWP includes the bandwidth of the initial DL BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell. Or,

[0211] The gNB can instruct the UE to receive MBS services on a certain SCell, and configure the bandwidth of the dedicated DL BWP of the Scell ​​to include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0212] Furthermore, if the UE receives broadcast MBS services on the SCell, the SCell cannot be deactivated and dormant BWP cannot be configured (i.e., the SCell cannot be in an activated state with sleep behavior). Alternatively, if the UE receives broadcast MBS services on the SCell, if the SCell is deactivated, or dormant BWP is configured and activated, the UE is only allowed to continue to monitor the G-RNTI-scrambled PDCCH and corresponding PDSCH reception in the cell, but cannot receive the C-RNTI-scrambled PDCCH and corresponding PDSCH reception. And the bandwidth of the first activated DL BWP of the SCell must include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0213] Step 511: The UE sends an RRCReconfigurationComplete message to the gNB.

[0214] Here, the UE sends an RRC reconfiguration complete message to the gNB via SRB1.

[0215] Application Example 4

[0216] Application Example 4 corresponds to Case 4 in the above solution, refer to Figure 6 , Figure 6 This is a flow chart of the MBS service indication method provided in the embodiment of the present application. Figure 5 ,like Figure 6 As shown, the MBS service indication method includes the following steps:

[0217] Step 601: The UE is in an RRC inactive state and is receiving a broadcast MBS service.

[0218] Here, the identifier of the broadcast MBS service is TMGI-1.

[0219] Step 602: The UE receives a system broadcast message sent by the target gNB and configures a first association relationship and / or a second association relationship.

[0220] Here, "association relationship" can also be called "mapping relationship".

[0221] Here, the first association relationship is the association relationship between the preamble and / or RO (rach occasion) resources and whether the MBS service is in progress. The second association relationship is the association relationship between the preamble and / or RO (rach occasion) resources and the MBS service identifier (ie, the identifier information of the MBS service).

[0222] It should be noted that there is no order between the above steps 501 and 502.

[0223] Step 603: The UE sends MSG1 to the target gNB.

[0224] Here, the UE selects corresponding preamble and / or RO resources to send MSG1 according to whether the MBS service is currently being received and / or identification information of the received MBS service.

[0225] Step 604: The target gNB determines whether the UE is receiving the MBS service and / or the identification information of the MBS service being received based on the preamble and / or RO resources of MSG1.

[0226] Step 605: The target gNB sends MSG2 to the UE.

[0227] Step 606: The UE sends an RRC recovery request (RRCResumeRequest) message to the target gNB.

[0228] Here, the UE sends an RRC recovery request message to the target gNB through SRB0.

[0229] Step 607: The target gNB sends an RRC recovery message to the UE, carrying the configuration information of the dedicated downlink BWP.

[0230] Here, the target gNB sends an RRC recovery message to the UE via SRB1.

[0231] Here, after the gNB obtains the identification information of the MBS service that the UE is interested in or is receiving, it configures the configuration information of the dedicated downlink BWP through the RRC recovery message, specifically:

[0232] When the gNB configures a dedicated DL BWP for the PCell for the UE, the bandwidth of the dedicated DL BWP includes the bandwidth of the initial DL BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell. Or,

[0233] The gNB can instruct the UE to receive MBS services on a certain SCell, and configure the bandwidth of the dedicated DL BWP of the Scell ​​to include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0234] Furthermore, if the UE receives broadcast MBS services on the SCell, the SCell cannot be deactivated and dormant BWP cannot be configured (i.e., the SCell cannot be in an activated state with sleep behavior). Alternatively, if the UE receives broadcast MBS services on the SCell, if the SCell is deactivated, or dormant BWP is configured and activated, the UE is only allowed to continue to monitor the G-RNTI-scrambled PDCCH and corresponding PDSCH reception in the cell, but cannot receive the C-RNTI-scrambled PDCCH and corresponding PDSCH reception. And the bandwidth of the first activated DL BWP of the SCell must include the bandwidth of the initial DL BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0235] Step 608: The UE enters the RRC connected state.

[0236] Step 609: The UE sends an RRC recovery complete (RRCResumeComplete) message.

[0237] Here, the UE sends an RRC recovery complete message via SRB1.

[0238] Step 610: The gNB sends an RRCReconfiguration message to the UE.

[0239] Step 611: The UE sends an RRCReconfigurationComplete message to the gNB.

[0240] Here, the UE sends an RRC reconfiguration complete message to the gNB via SRB1.

[0241] Figure 7 This is a schematic diagram of the structure of the MBS service indication device provided in the embodiment of the present application. Figure 1 , applied to terminal devices, such as Figure 7 As shown, the MBS service indication device includes:

[0242] The communication unit 701 is configured to send identification information of an MBS service to a network device, where the MBS service is an MBS service expected by the terminal device or an MBS service being received;

[0243] The identification information of the MBS service is used for configuration of a dedicated downlink BWP of the terminal device and / or the identification information of the MBS service is used for determining a target cell to be switched by the terminal device.

[0244] In an optional manner, the communication unit 701 is used to send identification information of the MBS service to the network device through a first RRC message, and the first RRC message is an RRC message that has not been security processed.

[0245] In an optional manner, the first RRC message is an RRC establishment completion message; or,

[0246] The first RRC message is an MBS indication message.

[0247] In an optional manner, the communication unit 701 is used to send identification information of the MBS service to the network device through a second RRC message, and the second RRC message is a security-processed RRC message.

[0248] In an optional manner, the second RRC message is a security activation completion message; or,

[0249] The second RRC message is a UE assistance information UEAssistanceInformation message; or,

[0250] The second RRC message is an MBS indication message.

[0251] In an optional manner, the MBS service is an MBS service expected by the terminal device or an MBS service being received in an RRC idle state;

[0252] The communication unit 701 is further configured to send an RRC establishment request message to the network device; and receive an RRC establishment message sent by the network device.

[0253] In an optional manner, the MBS service is an MBS service expected by the terminal device or an MBS service being received in an RRC inactive state;

[0254] The communication unit 701 is further used to send an RRC recovery request message to the network device; wherein the RRC recovery process falls back to the RRC establishment process; and receive the RRC establishment message sent by the network device.

[0255] In an optional manner, the communication unit 701 is configured to send identification information of the MBS service to the network device via an RRC recovery complete message.

[0256] In an optional manner, the communication unit 701 is further used to send an RRC recovery request message to the network device; and receive the RRC recovery message sent by the network device.

[0257] In an optional manner, the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service.

[0258] In an optional manner, the RRC recovery request message carries the first indication information; wherein,

[0259] The value of the idle bit in the RRC recovery request message is used to represent the first indication information; or,

[0260] The value of the recovery reason in the RRC recovery request message is used to represent the first indication information.

[0261] In an optional manner, the value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

[0262] In an optional manner, the logical channel identifier of the CCCH is carried in a packet header corresponding to the RRC recovery request message in the MACTB.

[0263] In an optional manner, the communication unit 701 is further configured to send MSG1 or MSGA to the network device, where the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following:

[0264] Whether the terminal device is receiving a broadcast MBS service;

[0265] The identification information of the MBS service being received by the terminal device.

[0266] In an optional manner, the RRC recovery message carries second configuration information, and the second configuration information is used to determine the BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

[0267] In an optional manner, the bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

[0268] In an optional manner, the communication unit 701 is further used to receive an RRC reconfiguration message sent by the network device, where the RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine configuration information of the dedicated downlink BWP.

[0269] In an optional manner, the communication unit 701 is configured to send identification information of the MBS service to the network device via MSG1 or MSGA.

[0270] In an optional manner, the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following:

[0271] Whether the terminal device is receiving a broadcast MBS service;

[0272] The identification information of the MBS service being received by the terminal device.

[0273] In an optional manner, the communication unit 701 is further used to send an RRC recovery request message to the network device; receive an RRC recovery message sent by the network device, the RRC recovery message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

[0274] In an optional manner, the preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with whether the terminal device is receiving a broadcast MBS service; and / or,

[0275] The preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device.

[0276] In an optional manner, the association relationship is configured through a system broadcast message.

[0277] In an optional manner, the device further includes:

[0278] The determining unit 702 is configured to determine the preamble code and / or RO resource corresponding to the MSG1 or MSGA according to whether the broadcast MBS service is being received and / or the identification information of the received MBS service.

[0279] In an optional manner, the first configuration information is used to determine configuration information of a dedicated downlink BWP of the PCell, and the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

[0280] In an optional manner, the first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

[0281] In an optional manner, the communication unit 701 is further used to receive second indication information sent by the network device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

[0282] In an optional manner, if the terminal device receives a broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

[0283] In an optional manner, if the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behavior:

[0284] Monitoring the PDCCH scrambled by the G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH;

[0285] The SCell does not monitor the PDCCH scrambled by the C-RNTI and does not receive the PDSCH corresponding to the PDCCH.

[0286] In an optional manner, the bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0287] In an optional manner, the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device, including:

[0288] The identification information of the MBS service is used by the network device to select a cell supporting the MBS service indicated by the identification information of the MBS service as a target cell for handover.

[0289] In an optional manner, before the network device selects a cell supporting the MBS service indicated by the identification information of the MBS service as a target cell for switching, the cell and its neighboring cells exchange identification information about the MBS services supported by each cell or the MBS services being transmitted.

[0290] Those skilled in the art should understand that the relevant description of the above-mentioned MBS service indication device in the embodiment of the present application can be understood by referring to the relevant description of the MBS service indication method in the embodiment of the present application.

[0291] Figure 8 This is a schematic diagram of the structure of the MBS service indication device provided in the embodiment of the present application. Figure 2 , applied to network equipment, such as Figure 8 As shown, the MBS service indication device includes:

[0292] The communication unit 801 is configured to receive identification information of an MBS service sent by a terminal device, where the MBS service is an MBS service desired by the terminal device or an MBS service being received;

[0293] The identification information of the MBS service is used by the network device to configure a dedicated downlink BWP for the terminal device and / or the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device.

[0294] In an optional manner, the communication unit 801 is used to receive identification information of the MBS service sent by the terminal device through a first RRC message, and the first RRC message is an RRC message that has not been security processed.

[0295] In an optional manner, the first RRC message is an RRC establishment completion message; or,

[0296] The first RRC message is an MBS indication message.

[0297] In an optional manner, the communication unit 801 is used to receive identification information of the MBS service sent by the terminal device through a second RRC message, and the second RRC message is an RRC message that has been security processed.

[0298] In an optional manner, the second RRC message is a security activation completion message; or,

[0299] The second RRC message is a UE assistance information UEAssistanceInformation message; or,

[0300] The second RRC message is an MBS indication message.

[0301] In an optional manner, the MBS service is an MBS service expected by the terminal device or an MBS service being received in an RRC idle state;

[0302] The communication unit 801 is further used to receive an RRC establishment request message sent by the terminal device; and send an RRC establishment message to the terminal device.

[0303] In an optional manner, the MBS service is the MBS service expected by the terminal device or the MBS service being received when the terminal device is in an RRC inactive state; the communication unit 801 is further used to receive an RRC recovery request message sent by the terminal device; wherein the RRC recovery process falls back to the RRC establishment process; and an RRC establishment message is sent to the terminal device.

[0304] In an optional manner, the communication unit 801 is used to receive identification information of the MBS service sent by the terminal device through an RRC recovery completion message.

[0305] In an optional manner, the communication unit 801 is further used to receive an RRC recovery request message sent by the terminal device; and send an RRC recovery message to the terminal device.

[0306] In an optional manner, the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service.

[0307] In an optional manner, the RRC recovery request message carries the first indication information; wherein,

[0308] The value of the idle bit in the RRC recovery request message is used to represent the first indication information; or,

[0309] The value of the recovery reason in the RRC recovery request message is used to represent the first indication information.

[0310] In an optional manner, the value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

[0311] In an optional manner, the logical channel identifier of the CCCH is carried in a packet header corresponding to the RRC recovery request message in the MACTB.

[0312] In an optional manner, the communication unit 801 is further used to receive MSG1 or MSGA sent by the terminal device, where the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following:

[0313] Whether the terminal device is receiving a broadcast MBS service;

[0314] The identification information of the MBS service being received by the terminal device.

[0315] In an optional manner, the RRC recovery message carries second configuration information, and the second configuration information is used to determine the BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

[0316] In an optional manner, the bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

[0317] In an optional manner, the communication unit 801 is further used to send an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

[0318] In an optional manner, the communication unit 801 is used to receive identification information of the MBS service sent by the terminal device through MSG1 or MSGA.

[0319] In an optional manner, the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following:

[0320] Whether the terminal device is receiving a broadcast MBS service;

[0321] The identification information of the MBS service being received by the terminal device.

[0322] In an optional manner, the communication unit 801 is further used to receive an RRC recovery request message sent by the terminal device; send an RRC recovery message to the terminal device, the RRC recovery message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

[0323] In an optional manner, the preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with whether the terminal device is receiving a broadcast MBS service; and / or,

[0324] The preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device.

[0325] In an optional manner, the association relationship is configured through a system broadcast message.

[0326] In an optional manner, the first configuration information is used to determine configuration information of a dedicated downlink BWP of the PCell, and the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

[0327] In an optional manner, the first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

[0328] In an optional manner, the communication unit 801 is further used to send second indication information to the terminal device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

[0329] In an optional manner, if the terminal device receives a broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

[0330] In an optional manner, if the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behavior:

[0331] Monitoring the PDCCH scrambled by the G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH;

[0332] The SCell does not monitor the PDCCH scrambled by the C-RNTI and does not receive the PDSCH corresponding to the PDCCH.

[0333] In an optional manner, the bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

[0334] In an optional manner, the device further includes:

[0335] The selection unit 802 is configured to select, according to the identification information of the MBS service, a cell supporting the MBS service indicated by the identification information of the MBS service as a target cell for handover.

[0336] In an optional manner, before the network device selects a cell supporting the MBS service indicated by the identification information of the MBS service as a target cell for switching, the cell and its neighboring cells exchange identification information about the MBS services supported by each cell or the MBS services being transmitted.

[0337] Those skilled in the art should understand that the relevant description of the above-mentioned MBS service indication device in the embodiment of the present application can be understood by referring to the relevant description of the MBS service indication method in the embodiment of the present application.

[0338] Fig. 9 900 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device may be a terminal device or a network device. Fig. 9 The communication device 900 shown includes a processor 910, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0339] Alternatively, if Fig. 9 As shown, the communication device 900 may further include a memory 920. The processor 910 may call and run a computer program from the memory 920 to implement the method in the embodiment of the present application.

[0340] The memory 920 may be a separate device independent of the processor 910 , or may be integrated into the processor 910 .

[0341] Alternatively, if Fig. 9 As shown, the communication device 900 may further include a transceiver 930, and the processor 910 may control the transceiver 930 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

[0342] The transceiver 930 may include a transmitter and a receiver. The transceiver 930 may further include an antenna, and the number of antennas may be one or more.

[0343] Optionally, the communication device 900 may specifically be a network device of an embodiment of the present application, and the communication device 900 may implement corresponding processes implemented by the network device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0344] Optionally, the communication device 900 may specifically be a mobile terminal / terminal device of an embodiment of the present application, and the communication device 900 may implement the corresponding processes implemented by the mobile terminal / terminal device in each method of the embodiment of the present application, which will not be described again for the sake of brevity.

[0345] Fig.10 It is a schematic structural diagram of the chip of an embodiment of the present application. Fig.10 The chip 1000 shown includes a processor 1010, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0346] Alternatively, if Fig.10 As shown, the chip 1000 may further include a memory 1020. The processor 1010 may call and run a computer program from the memory 1020 to implement the method in the embodiment of the present application.

[0347] The memory 1020 may be a separate device independent of the processor 1010 , or may be integrated into the processor 1010 .

[0348] Optionally, the chip 1000 may further include an input interface 1030. The processor 1010 may control the input interface 1030 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0349] Optionally, the chip 1000 may further include an output interface 1040. The processor 1010 may control the output interface 1040 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0350] Optionally, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0351] Optionally, the chip can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0352] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0353] Fig.11 1 is a schematic block diagram of a communication system 1100 provided in an embodiment of the present application. Fig.11 As shown, the communication system 1100 includes a terminal device 1110 and a network device 1120 .

[0354] Among them, the terminal device 1110 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 1120 can be used to implement the corresponding functions implemented by the network device in the above method. For the sake of brevity, they are not repeated here.

[0355] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined and performed. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0356] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0357] It should be understood that the above-mentioned memory is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0358] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0359] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0360] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0361] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0362] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0363] Optionally, the computer program product can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0364] The embodiment of the present application also provides a computer program.

[0365] Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods in the embodiments of the present application. For the sake of brevity, they are not described here.

[0366] Optionally, the computer program can be applied to the mobile terminal / terminal device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0367] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0368] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0369] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0370] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0371] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0372] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0373] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for indicating a multicast multicast service (MBS) service, the method comprising: The terminal device sends identification information of the MBS service to the network device, where the MBS service is the MBS service expected by the terminal device or the MBS service being received; The identification information of the MBS service is used for configuration of a dedicated downlink bandwidth part BWP of the terminal device and / or the identification information of the MBS service is used for determining a target cell to be switched by the terminal device; The terminal device sends the identification information of the MBS service to the network device, including: The terminal device sends the identification information of the MBS service to the network device through an RRC recovery completion message; Before the terminal device sends the RRC recovery complete message, the method further includes: The terminal device sends an RRC recovery request message to the network device; wherein the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service; The terminal device receives the RRC recovery message sent by the network device.

2. The method according to claim 1, wherein: The terminal device sends the identification information of the MBS service to the network device, including: The terminal device sends identification information of the MBS service to the network device through a first RRC message, and the first RRC message is an RRC message that has not been security processed.

3. The method according to claim 2, wherein: The first RRC message is an RRC setup complete message; or, The first RRC message is an MBS indication message.

4. The method according to claim 1, wherein: The terminal device sends the identification information of the MBS service to the network device, including: The terminal device sends identification information of the MBS service to the network device through a second RRC message, and the second RRC message is a security-processed RRC message.

5. The method according to claim 4, wherein: The second RRC message is a security activation completion message; or, The second RRC message is a UE assistance information UEAssistanceInformation message; or, The second RRC message is an MBS indication message.

6. The method according to any one of claims 2 to 5, wherein: The MBS service is an MBS service that the terminal device expects or is receiving in an RRC idle state; Before the terminal device enters the RRC connected state, the method further includes: The terminal device sends an RRC establishment request message to the network device; The terminal device receives the RRC establishment message sent by the network device.

7. The method according to any one of claims 2 to 5, wherein: The MBS service is an MBS service that the terminal device expects or is receiving when the terminal device is in an RRC inactive state; Before the terminal device enters the RRC connected state, the method further includes: The terminal device sends an RRC recovery request message to the network device; wherein the RRC recovery process falls back to the RRC establishment process; The terminal device receives the RRC establishment message sent by the network device.

8. The method according to claim 1, wherein: The RRC recovery request message carries the first indication information; wherein, The value of the idle bit in the RRC recovery request message is used to represent the first indication information; or, The value of the recovery reason in the RRC recovery request message is used to represent the first indication information.

9. The method according to claim 1, wherein: The value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

10. The method according to claim 9, wherein: The logical channel identifier of the CCCH is carried in the packet header corresponding to the RRC recovery request message in the MAC TB.

11. The method according to claim 1, wherein: Before the terminal device sends the RRC recovery request message to the network device, the method further includes: The terminal device sends MSG1 or MSGA to the network device, where the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

12. The method according to any one of claims 1, 8 to 11, wherein: The RRC recovery message carries second configuration information, where the second configuration information is used to determine BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

13. The method according to claim 12, wherein: The bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

14. The method according to any one of claims 2 to 5, wherein: The method further comprises: The terminal device receives an RRC reconfiguration message sent by the network device, where the RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine configuration information of the dedicated downlink BWP.

15. The method according to claim 1, wherein: The terminal device sends the identification information of the MBS service to the network device, including: The terminal device sends the identification information of the MBS service to the network device through MSG1 or MSGA.

16. The method according to claim 15, wherein: The MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

17. The method according to claim 15 or 16, wherein: After the terminal device sends MSG1 or MSGA, the method further includes: The terminal device sends an RRC recovery request message to the network device; The terminal device receives an RRC recovery message sent by the network device, where the RRC recovery message carries first configuration information, and the first configuration information is used to determine configuration information of the dedicated downlink BWP.

18. The method according to any one of claims 11, 15 and 16, wherein: The preamble code and / or RO resource corresponding to MSG1 or MSGA is associated with whether the terminal device is receiving a broadcast MBS service; and / or, The preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device.

19. The method according to claim 18, wherein: The association relationship is configured through a system broadcast message.

20. The method according to claim 19, wherein: The method further comprises: The terminal device determines the preamble code and / or RO resource corresponding to the MSG1 or MSGA according to whether the broadcast MBS service is being received and / or the identification information of the received MBS service.

21. The method according to claim 14, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the PCell, where the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

22. The method according to claim 14, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

23. The method according to claim 22, wherein: The method further comprises: The terminal device receives second indication information sent by the network device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

24. The method according to claim 22 or 23, wherein: If the terminal device receives the broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

25. The method according to claim 22 or 23, wherein: If the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behaviors: Monitoring the PDCCH scrambled by the G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH; The SCell does not monitor the PDCCH scrambled by the C-RNTI and does not receive the PDSCH corresponding to the PDCCH.

26. The method according to claim 25, wherein: The bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

27. A method for indicating an MBS service, the method comprising: The network device receives identification information of an MBS service sent by a terminal device, where the MBS service is an MBS service expected by the terminal device or an MBS service being received; The identification information of the MBS service is used by the network device to configure a dedicated downlink BWP for the terminal device and / or the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device; The network device receives the identification information of the MBS service sent by the terminal device, including: The network device receives the identification information of the MBS service sent by the terminal device through the RRC recovery completion message; Before the network device receives the RRC recovery completion message sent by the terminal device, the method further includes: The network device receives an RRC recovery request message sent by the terminal device; wherein the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service; The network device sends an RRC recovery message to the terminal device.

28. The method according to claim 27, wherein: The network device receives the identification information of the MBS service sent by the terminal device, including: The network device receives identification information of the MBS service sent by the terminal device through a first RRC message, where the first RRC message is an RRC message that has not been security processed.

29. The method according to claim 28, wherein: The first RRC message is an RRC setup complete message; or, The first RRC message is an MBS indication message.

30. The method of claim 27, wherein: The network device receives the identification information of the MBS service sent by the terminal device, including: The network device receives identification information of the MBS service sent by the terminal device through a second RRC message, where the second RRC message is a security-processed RRC message.

31. The method according to claim 30, wherein: The second RRC message is a security activation completion message; or, The second RRC message is a UE assistance information UEAssistanceInformation message; or, The second RRC message is an MBS indication message.

32. The method according to any one of claims 28 to 31, wherein: The MBS service is an MBS service that the terminal device expects or is receiving in an RRC idle state; The method further comprises: The network device receives an RRC establishment request message sent by the terminal device; The network device sends an RRC establishment message to the terminal device.

33. The method according to any one of claims 28 to 31, wherein: The MBS service is an MBS service that the terminal device expects or is receiving in an RRC inactive state; The method further comprises: The network device receives an RRC recovery request message sent by the terminal device; wherein the RRC recovery process falls back to the RRC establishment process; The network device sends an RRC establishment message to the terminal device.

34. The method of claim 27, wherein: The RRC recovery request message carries the first indication information; wherein, The value of the idle bit in the RRC recovery request message is used to represent the first indication information; or, The value of the recovery reason in the RRC recovery request message is used to represent the first indication information.

35. The method of claim 27, wherein: The value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

36. The method of claim 35, wherein: The logical channel identifier of the CCCH is carried in the packet header corresponding to the RRC recovery request message in the MAC TB.

37. The method of claim 27, wherein: Before the network device receives the RRC recovery request message sent by the terminal device, the method further includes: The network device receives MSG1 or MSGA sent by the terminal device, where the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

38. The method according to any one of claims 27, 34 to 37, wherein: The RRC recovery message carries second configuration information, where the second configuration information is used to determine BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

39. The method of claim 38, wherein: The bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

40. The method according to any one of claims 28 to 31, wherein: The method further comprises: The network device sends an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine configuration information of the dedicated downlink BWP.

41. The method of claim 27, wherein: The network device receives the identification information of the MBS service sent by the terminal device, including: The network device receives the identification information of the MBS service sent by the terminal device through MSG1 or MSGA.

42. The method according to claim 41, wherein: The MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

43. The method according to claim 41 or 42, wherein: After the network device receives the MSG1 or MSGA sent by the terminal device, the method further includes: The network device receives an RRC recovery request message sent by the terminal device; The network device sends an RRC recovery message to the terminal device, where the RRC recovery message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

44. The method according to any one of claims 37, 41, and 42, wherein: The preamble code and / or RO resource corresponding to MSG1 or MSGA is associated with whether the terminal device is receiving a broadcast MBS service; and / or, The preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device.

45. The method of claim 44, wherein: The association relationship is configured through a system broadcast message.

46. ​​The method of claim 40, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the PCell, where the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

47. The method of claim 40, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

48. The method of claim 47, wherein: The method further comprises: The network device sends second indication information to the terminal device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

49. The method according to claim 47 or 48, wherein: If the terminal device receives the broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

50. The method of claim 47 or 48, wherein: If the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behaviors: Monitoring the PDCCH scrambled by the G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH; The SCell does not monitor the PDCCH scrambled by the C-RNTI and does not receive the PDSCH corresponding to the PDCCH.

51. The method of claim 50, wherein: The bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

52. The method according to any one of claims 27 to 31, 34 to 37, 39, 41, 42, 45 to 48, 51, wherein The method further comprises: The network device selects, according to the identification information of the MBS service, a cell supporting the MBS service indicated by the identification information of the MBS service as a target cell for handover.

53. The method of claim 52, wherein: Before the network device selects the cell supporting the MBS service indicated by the identification information of the MBS service as the target cell for handover, the cell and its neighboring cells exchange identification information about the MBS service supported by each cell or the MBS service being transmitted.

54. An MBS service indication device, applied to a terminal device, comprising: A communication unit, configured to send identification information of an MBS service to a network device, wherein the MBS service is an MBS service expected by the terminal device or an MBS service being received; The identification information of the MBS service is used for configuration of a dedicated downlink bandwidth part BWP of the terminal device and / or the identification information of the MBS service is used for determining a target cell to be switched by the terminal device; The communication unit is configured to send identification information of the MBS service to the network device through an RRC recovery completion message; The communication unit is also used to send an RRC recovery request message to the network device; receive the RRC recovery message sent by the network device; wherein the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service.

55. The apparatus of claim 54, wherein: The communication unit is used to send identification information of the MBS service to the network device through a first RRC message, where the first RRC message is an RRC message that has not been security processed.

56. The apparatus of claim 55, wherein: The first RRC message is an RRC setup complete message; or, The first RRC message is an MBS indication message.

57. The apparatus of claim 54, wherein: The communication unit is used to send the identification information of the MBS service to the network device through a second RRC message, where the second RRC message is a security-processed RRC message.

58. The apparatus of claim 57, wherein: The second RRC message is a security activation completion message; or, The second RRC message is a UE assistance information UEAssistanceInformation message; or, The second RRC message is an MBS indication message.

59. The device according to any one of claims 55 to 58, wherein The MBS service is an MBS service that the terminal device expects or is receiving in an RRC idle state; The communication unit is further used to send an RRC establishment request message to the network device; and receive the RRC establishment message sent by the network device.

60. The device according to any one of claims 55 to 58, wherein: The MBS service is an MBS service that the terminal device expects or is receiving in an RRC inactive state; The communication unit is further used to send an RRC recovery request message to the network device; wherein the RRC recovery process falls back to the RRC establishment process; and receive the RRC establishment message sent by the network device.

61. The apparatus of claim 54, wherein: The RRC recovery request message carries the first indication information; wherein, The value of the idle bit in the RRC recovery request message is used to represent the first indication information; or, The value of the recovery reason in the RRC recovery request message is used to represent the first indication information.

62. The apparatus of claim 54, wherein: The value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

63. The device according to claim 62, wherein The logical channel identifier of the CCCH is carried in the packet header corresponding to the RRC recovery request message in the MAC TB.

64. The apparatus of claim 54, wherein: The communication unit is further used to send MSG1 or MSGA to the network device, where the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

65. The device according to any one of claims 54, 61 to 64, wherein The RRC recovery message carries second configuration information, where the second configuration information is used to determine BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

66. The apparatus of claim 65, wherein: The bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

67. The device according to any one of claims 55 to 58, wherein The communication unit is further used to receive an RRC reconfiguration message sent by the network device, where the RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

68. The apparatus of claim 54, wherein: The communication unit is used to send the identification information of the MBS service to the network device through MSG1 or MSGA.

69. The apparatus of claim 68, wherein: The MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

70. The device according to claim 68 or 69, wherein The communication unit is further used to send an RRC recovery request message to the network device; receive an RRC recovery message sent by the network device, wherein the RRC recovery message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

71. The device according to any one of claims 64, 68, and 69, wherein: The preamble code and / or RO resource corresponding to MSG1 or MSGA is associated with whether the terminal device is receiving a broadcast MBS service; and / or, The preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device.

72. The apparatus of claim 71, wherein: The association relationship is configured through a system broadcast message.

73. The apparatus of claim 72, wherein: The device also includes: The determining unit is used to determine the preamble code and / or RO resource corresponding to the MSG1 or MSGA according to whether the broadcast MBS service is being received and / or the identification information of the received MBS service.

74. The apparatus of claim 67, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the PCell, where the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

75. The apparatus of claim 67, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

76. The apparatus of claim 75, wherein: The communication unit is further used to receive second indication information sent by the network device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

77. The apparatus of claim 75 or 76, wherein: If the terminal device receives the broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

78. The apparatus of claim 75 or 76, wherein: If the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behaviors: Monitoring the PDCCH scrambled by the G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH; The SCell does not monitor the PDCCH scrambled by the C-RNTI and does not receive the PDSCH corresponding to the PDCCH.

79. The apparatus of claim 78, wherein: The bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

80. An MBS service indication device, applied to a network device, comprising: A communication unit, configured to receive identification information of an MBS service sent by a terminal device, wherein the MBS service is an MBS service desired by the terminal device or an MBS service being received; The identification information of the MBS service is used by the network device to configure a dedicated downlink BWP for the terminal device and / or the identification information of the MBS service is used by the network device to select a target cell to be switched for the terminal device; The communication unit is configured to receive identification information of the MBS service sent by the terminal device through an RRC recovery completion message; The communication unit is further used to receive an RRC recovery request message sent by the terminal device; and send an RRC recovery message to the terminal device; wherein the RRC recovery request message is used to determine first indication information, and the first indication information is used to indicate whether the terminal device is receiving a broadcast MBS service.

81. The apparatus of claim 80, wherein: The communication unit is used to receive identification information of the MBS service sent by the terminal device through a first RRC message, where the first RRC message is an RRC message that has not been security processed.

82. The apparatus of claim 81, wherein: The first RRC message is an RRC setup complete message; or, The first RRC message is an MBS indication message.

83. The apparatus of claim 80, wherein: The communication unit is used to receive identification information of the MBS service sent by the terminal device through a second RRC message, where the second RRC message is a security-processed RRC message.

84. The apparatus of claim 83, wherein: The second RRC message is a security activation completion message; or, The second RRC message is a UE assistance information UEAssistanceInformation message; or, The second RRC message is an MBS indication message.

85. The device according to any one of claims 81 to 84, wherein The MBS service is an MBS service that the terminal device expects or is receiving in an RRC idle state; The communication unit is also used to receive an RRC establishment request message sent by the terminal device; and send an RRC establishment message to the terminal device.

86. The device according to any one of claims 81 to 84, wherein The MBS service is the MBS service expected by the terminal device or the MBS service being received when the terminal device is in an RRC inactive state; the communication unit is also used to receive an RRC recovery request message sent by the terminal device; wherein the RRC recovery process falls back to the RRC establishment process; and an RRC establishment message is sent to the terminal device.

87. The apparatus of claim 80, wherein: The RRC recovery request message carries the first indication information; wherein, The value of the idle bit in the RRC recovery request message is used to represent the first indication information; or, The value of the recovery reason in the RRC recovery request message is used to represent the first indication information.

88. The apparatus of claim 80, wherein: The value of the logical channel identifier of the CCCH corresponding to the RRC recovery request message is used to represent the first indication information.

89. The apparatus of claim 88, wherein: The logical channel identifier of the CCCH is carried in the packet header corresponding to the RRC recovery request message in the MAC TB.

90. The apparatus of claim 80, wherein: The communication unit is further used to receive MSG1 or MSGA sent by the terminal device, where the MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

91. The device according to any one of claims 80, 87 to 90, wherein The RRC recovery message carries second configuration information, where the second configuration information is used to determine BWP configuration information of the PCell, wherein the bandwidth of the first activated downlink BWP of the PCell includes the bandwidth of the initial downlink BWP of the PCell and / or the bandwidth of the MBS BWP of the PCell.

92. The apparatus of claim 91, wherein: The bandwidth of the MBS BWP of the PCell is determined by the network device according to the bandwidth of the MBS BWP corresponding to the MBS service identifier indicated by the terminal device.

93. The device according to any one of claims 81 to 84, wherein: The communication unit is further used to send an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

94. The apparatus of claim 80, wherein: The communication unit is used to receive the identification information of the MBS service sent by the terminal device through MSG1 or MSGA.

95. The apparatus of claim 94, wherein: The MSG1 or MSGA is used to determine first indication information, where the first indication information is used to indicate at least one of the following: Whether the terminal device is receiving a broadcast MBS service; The identification information of the MBS service being received by the terminal device.

96. The device according to claim 94 or 95, wherein: The communication unit is also used to receive an RRC recovery request message sent by the terminal device; send an RRC recovery message to the terminal device, the RRC recovery message carries first configuration information, and the first configuration information is used to determine the configuration information of the dedicated downlink BWP.

97. The device according to any one of claims 90, 94 and 95, wherein: The preamble code and / or RO resource corresponding to MSG1 or MSGA is associated with whether the terminal device is receiving a broadcast MBS service; and / or, The preamble code and / or RO resource corresponding to the MSG1 or MSGA is associated with the identification information of the MBS service received by the terminal device.

98. The apparatus of claim 97, wherein: The association relationship is configured through a system broadcast message.

99. The apparatus of claim 93, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the PCell, where the bandwidth of the dedicated downlink BWP of the PCell includes the bandwidth of an initial downlink BWP of the PCell and / or the bandwidth of an MBS BWP of the PCell.

100. The apparatus of claim 93, wherein: The first configuration information is used to determine configuration information of a dedicated downlink BWP of the SCell, and the bandwidth of the dedicated downlink BWP of the SCell includes the bandwidth of an initial downlink BWP of the SCell and / or the bandwidth of an MBS BWP of the SCell.

101. The device according to claim 100, wherein The communication unit is further used to send second indication information to the terminal device, where the second indication information is used to instruct the terminal device to receive the broadcast MBS service on the SCell.

102. The device according to claim 100 or 101, wherein: If the terminal device receives the broadcast MBS service on the SCell, the SCell is in an activated state or in an activated state with non-dormancy behavior.

103. The device according to claim 100 or 101, wherein: If the terminal device receives a broadcast MBS service on the SCell, and the SCell is in a deactivated state or in an activated state with dormancy behavior, the terminal device has the following behaviors: Monitoring the PDCCH scrambled by the G-RNTI on the SCell and receiving the PDSCH corresponding to the PDCCH; The SCell does not monitor the PDCCH scrambled by the C-RNTI and does not receive the PDSCH corresponding to the PDCCH.

104. The device according to claim 103, wherein The bandwidth of the first activated downlink BWP of the SCell includes the bandwidth of the initial downlink BWP of the SCell and / or the bandwidth of the MBS BWP of the SCell.

105. The device of any one of claims 80, 87 to 90, 92, 94, 95, 98, 99, 100, 101 or 104, wherein: The device also includes: The selection unit is configured to select, according to the identification information of the MBS service, a cell supporting the MBS service indicated by the identification information of the MBS service as a target cell for handover.

106. The apparatus of claim 105, wherein: Before the network device selects the cell supporting the MBS service indicated by the identification information of the MBS service as the target cell for handover, the cell and its neighboring cells exchange identification information about the MBS service supported by each cell or the MBS service being transmitted.

107. A terminal device comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 1 to 26.

108. A network device comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 27 to 53.

109. A chip, comprising: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 26.

110. A chip, comprising: A processor, configured to call and run a computer program from a memory so that a device equipped with the chip executes a method as claimed in any one of claims 27 to 53.

111. A computer-readable storage medium for storing a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 26.

112. A computer-readable storage medium for storing a computer program, wherein the computer program causes a computer to execute the method as claimed in any one of claims 27 to 53.

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