WO2022155768A1

WO2022155768A1 - Communication method, device, and storage medium

Info

Publication number: WO2022155768A1
Application number: PCT/CN2021/072620
Authority: WO
Inventors: 卢飞; 王淑坤; 郭雅莉
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2022-07-28
Also published as: CN116615920A

Abstract

The embodiments of the present application provide a communication method, a device, and a storage medium. Said method comprises: a terminal device receiving first information, wherein the first information is used for indicating the length of first identifier information, and the first identifier information is used for the terminal device to request a multimedia broadcast multicast service; and the terminal device determining, according to the first information, at least one bit in temporary mobile group identifier information included in the first identifier information and/or at least one bit in identifier information of a first network included in the first identifier information, wherein the first network is a network that provides a service for the terminal device. The flexibility of configuration and the resource utilization rate are expected to be improved.

Description

Communication method, device and storage medium

technical field

The embodiments of the present application relate to communication technologies, and in particular, to a communication method, device, and storage medium.

Background technique

In addition to meeting the needs of ordinary users for mobile broadband Internet services, the ^5th generation (5G) wireless communication system can also provide dedicated access networks for vertical industries. The 3rd generation partnership project (3GPP) is in The 5G Rel-16 standard has added research and standardization of non-public network (NPN) scenario requirements and functions. NPN can be well integrated with the industrial Internet to achieve end-to-end resource isolation, provide dedicated access networks for vertical industries, restrict terminal devices in non-vertical industries from accessing dedicated networks or frequency bands, and ensure exclusive access to customer resources in vertical industries.

Multimedia broadcast multicast service (MBMS) is a point-to-multipoint transmission type service for multiple terminal devices, such as live broadcast service, part of public safety service, batch software update service, etc. Realize the sharing of network resources and improve the utilization rate of network resources, especially air interface resources.

However, how to apply the point-to-multipoint transmission mechanism to the NPN to improve network resource utilization has become a problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a communication method, device, and storage medium, so as to improve configuration flexibility and resource utilization.

In a first aspect, an embodiment of the present application may provide a communication method, which is applied to a terminal device, and the method includes:

The terminal device receives first information, where the first information is used to indicate the length of the first identification information, and the first identification information is used for the terminal device to request a multimedia broadcast multicast service;

The terminal device determines, according to the first information, at least one bit in the temporary mobility group identification information included in the first identification information, and/or at least one bit in the identification information of the first network included in the first identification information. A network is a network that provides services to the terminal device.

In the second aspect, the embodiments of the present application may further provide a communication method, which is applied to a network device, and the method includes:

The first network node determines the length of the first identification information, the first identification information is used by the terminal device to request the multimedia broadcast multicast service, and the first identification information includes at least one bit in the temporary mobile group identification information and/or the first network At least one bit in the identification information of the first network is a network that provides services for the terminal device;

The first network node sends first information to the terminal device, where the first information is used to indicate the length of the first identification information.

In a third aspect, the embodiments of the present application may further provide a terminal device, including:

a transceiver unit, configured to receive first information, where the first information is used to indicate the length of the first identification information, and the first identification information is used for the terminal device to request a multimedia broadcast multicast service;

a processing unit, configured to determine, according to the first information, at least one bit in the temporary mobile group identification information included in the first identification information, and/or at least one bit in the identification information of the first network included, the The first network is the network serving the terminal device.

In a fourth aspect, the embodiments of the present application may further provide a network device, including:

a processing unit, configured to determine the length of the first identification information, the first identification information is used for the terminal device to request the multimedia broadcast multicast service, the first identification information includes at least one bit in the temporary mobile group identification information and/or the first At least one bit in the identification information of the network, the first network is a network that provides services for the terminal device;

The transceiver unit is configured to send first information to the terminal device, where the first information is used to indicate the length of the first identification information.

In a fifth aspect, the embodiments of the present application may further provide a terminal device, including:

processors, memories, interfaces for communicating with network devices;

the memory stores computer-executed instructions;

The processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method as provided in any one of the first aspects.

In a sixth aspect, the embodiments of the present application may further provide a network device, including:

Processor, memory, interface for communication with terminal equipment;

the memory stores computer-executed instructions;

The processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method as provided in any one of the second aspects.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, are used to implement the communication method.

In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, are used to implement any one of the second aspect the communication method.

In a ninth aspect, an embodiment of the present application provides a program, which, when the program is executed by a processor, is used to execute the communication method according to any one of the above first aspects.

In a tenth aspect, an embodiment of the present application further provides a program, which, when the program is executed by a processor, is used to execute the communication method according to any one of the above second aspects.

Optionally, the above-mentioned processor may be a chip.

In an eleventh aspect, an embodiment of the present application provides a computer program product, including program instructions, where the program instructions are used to implement any one of the communication methods of the first aspect.

In a twelfth aspect, an embodiment of the present application provides a computer program product, including program instructions, where the program instructions are used to implement any one of the communication methods of the second aspect.

In a thirteenth aspect, an embodiment of the present application provides a chip, including: a processing module and a communication interface, where the processing module can execute the communication method of any one of the first aspect.

Further, the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to perform the first aspect. any one of the communication methods.

In a fourteenth aspect, an embodiment of the present application provides a chip, including: a processing module and a communication interface, where the processing module can execute any one of the methods of the second aspect.

Further, the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to perform the second aspect any one of the communication methods.

Description of drawings

Fig. 1 is a schematic diagram of a communication system provided by the application;

2 is a schematic diagram of a point-to-multipoint network architecture provided by the present application;

Fig. 3 is a schematic flow chart of the MBMS service establishment process;

Fig. 4 is an example diagram of the composition structure of TMGI;

Fig. 5 is an example diagram of the composition structure of NID;

Fig. 6 is a schematic flow chart of the communication method provided by the present application;

Fig. 7 is an example diagram of the structure of the first identification information provided by this application;

FIG. 8 is a schematic flowchart of Embodiment 1 of the communication method provided by the present application;

FIG. 9 is a schematic flowchart of Embodiment 2 of the communication method provided by the present application;

FIG. 10 is a schematic flowchart of Embodiment 3 of the communication method provided by this application;

11 is a schematic block diagram of an example of a communication device of the present application;

12 is a schematic structural diagram of an example of a terminal device of the present application;

FIG. 13 is a schematic structural diagram of an example of a network device of the present application.

Detailed ways

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), universal mobile telecommunications system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5th generation, 5G) system or new wireless ( new radio, NR), etc.

FIG. 1 is a schematic diagram of a communication system 100 suitable for an embodiment of the present application.

As shown in FIG. 1 , the communication system 100 may include at least one network device, such as the network device 110 in FIG. 1 ; the communication system 100 may also include at least one terminal device, such as the terminal device 120 in FIG. 1 . Wherein, the terminal device 120 may be mobile or fixed. The network device 110 and the terminal device 120 communicate via a wireless link. The network device 110 may be an access network node in an NPN, and the NPN network provides network services for the terminal device 120 through the network device 110 .

The terminal device in this embodiment of the present application may be a user equipment (user equipment, UE), an access terminal, 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 device, A wireless communication device, user agent or user equipment. The terminal device may also 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 wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks or in the future evolution of the public land mobile network (PLMN) equipment, etc., which are not limited in this embodiment of the present application.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiments of the present application, the terminal device may also be a terminal device in an Internet of Things (IoT) system. IoT is an important part of the future development of information technology, and its main technical feature is that items pass through communication technology Connect with the network, so as to realize the intelligent network of human-machine interconnection and interconnection of things.

The network device in this embodiment of the present application may be a device for communicating with terminal devices, and the network device may be an evolved base station (evolutional nodeB, eNB or eNodeB) in an LTE system, or a cloud radio access network (cloud radio access network). radio access network (CRAN) scenario, or the network device may be a relay station, an access point, a vehicle-mounted device, a network device in a 5G network, or a network device in a future evolved PLMN network, etc. This application implements Examples are not limited.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second" and the like in the description, claims and the above-mentioned drawings of the embodiments of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

The related technologies and terms involved in this application are described below.

1. 5G point-to-multipoint network architecture

In the 5G system, a point-to-multipoint transmission mechanism will be introduced. The network architecture of this transmission mechanism can be shown in FIG. 2 . The service layer and/or the application layer include application function (application function, AF)/application server (application server, AS) node, multimedia broadcast service function (multimedia broadcast service function, MBSF)-control plane (control plane, CP) ) node, namely MBSF-C, MBSF-user plane (UP) node, namely MBSF-U, network exposure function (NEF) node. Among them, the AF/AS communicates with MBSF-C, MBSF-U, and NEF through the xMB-U/MB2-U, xMB-C/MB2-C, and N33 interfaces, respectively. And the AF/AS communicates with the transport layer multimedia broadcast (multimedia broadcast, MB)-user plane (user plane function, UPF) node (ie, MB-UPF) through the N6/MB2-U interface. The communication between MBSF-C and NEF and MBSF-U is through the xMB-C/MB2-C and Nmbsu interfaces respectively, and the policy control function (PCF) node and MB-session management between MBSF-C and the transport layer Function (session management function, SMF) nodes (ie MB-SMF) communicate between each other through Npcf and Nmbsmf interfaces. The MBSF-U communicates with the MB-UPF node of the transport layer through the N6 interface. Communication between the NEF and the PCF node and the MB-SMF node of the transport layer is performed through the Npcf and Nmbsmf interfaces respectively.

In the network architecture of the point-to-multipoint transmission mechanism shown in Figure 2, the transport layer includes PCF nodes, MB-SMF nodes, MB-UPF nodes, access and mobility management function (AMF) nodes, SMF nodes, UPF nodes, and radio access network (RAN) nodes. Among them, PCF communicates with MB-SMF and AMF through N7 and N15 interfaces respectively, and MB-SMF communicates with MB-UPF, SMF and AMF through N4, N16a and N11 interfaces respectively. The communication between MB-UPF and RAN Communication between SMF and AMF and UPF is carried out through N11 and N4 interfaces respectively, and communication between AMF and RAN is carried out through N2 interface. In the network architecture shown in FIG. 2, terminal devices (eg, UE1, UE2, and UE3) can communicate with the network after establishing a wireless connection with a RAN node.

The 5G core network (5G core, 5GC) supports the protocol data unit (PDU) connection service. The PDU connection service is the service of exchanging PDU data packets between the UE and the data network (DN); the PDU connection service passes through The UE initiates the establishment of a PDU session to achieve this. After a PDU session is established, a data transmission channel between the UE and the DN is established.

The subscription information of each single-network slice selection assistance information (S-NSSAI) may include a default DN name (DN name, DNN) and multiple DNNs. When the UE initiates a PDU session establishment request ( PDU session establishment request) does not provide the DNN of the S-NSSAI, the serving AMF will select the default DNN for its S-NSSAI; if there is no default DNN, the serving AMF will select the locally configured DNN for the S-NSSAI. If the DNN carried by the UE in the PDU session establishment request message is not supported by the network, and the AMF cannot select a suitable SMF by querying the NF repository function (NRF) node, the AMF will reject the PDU A connection request, carrying the reason value "DNN is not supported".

Each PDU session supports a PDU session type, that is, Internet Protocol (IP) version 4 (ie IPv4), IP version 6 (ie IPv6), IPv4v6, Ethernet (Ethernet), Unstructured (Unstructured) a kind of.

In the process of multicast data transmission, when a terminal establishes a PDU session, a PDU session is established for the same service, and this session can support both unicast data transmission of services and multicast data transmission of data.

In the data interface N3 interface between the core network and the RAN, a UE-specific N3 channel may be used, and both unicast data and multicast data for the UE are transmitted in this specific channel. A shared transmission channel may also be used, and the transmission channel is shared by multiple terminals for data transmission, and the multiple terminals may belong to the same group.

2. The process of establishing MBMS service

FIG. 3 is a schematic flowchart of an MBMS service establishment process, and the MBMS service establishment process includes but is not limited to the following steps:

Step 1, unified data repository (UDR), MB-SMF, MB-UPF and MBSF for multicast configuration, this step can refer to Figure 8.2.3-2 in 3GPP technical report TR 23.757;

Step 2, the UE performs the registration process, and performs the PDU session establishment process according to the DNN and S-NSSAI; in the UE registration process, the UE needs to provide the AMF with the multicast capability of the UE, and the AMF needs to select the AMF in the PDU session establishment process. Multicast capable SMF;

Step 3, the content provider makes a service announcement, and the announcement message may include a temporary mobile group identity (TMGI). An IP multicast address (IP multicast address) to which the UE can join the service may also be provided.

Step 4, in order to join the multicast service, the UE initiates a PDU session modification process, and the UE carries the multicast address or TMGI in the PDU session modification request message;

Step 5, the AMF sends the Nsmf_PDU session update SM context message, namely the Nsmf_PDUSession_UpdateSMContext message, to the SMF, which carries the SM context identifier (identifier, ID) SM context ID and the PDU session modification request message sent by the UE in step 4.

Step 6, the SMF needs to check with the UDR whether the UE can use the multicast service, and obtain the MB-SMF identifier, that is, the MB-SMF ID;

Step 7, UDR returns MB-SMF ID to SMF;

Step 8, after the SMF obtains the MB-SMF ID, the SMF sends a multicast quality of service (quality of service, QoS) request message to the MB-SMF;

Step 9, the MB-SMF returns a multicast QoS response message to the SMF, and the message includes a QoS message corresponding to the multicast QoS flow (QoS flow);

Step 10, SMF sends a Namf_Communication_N1N2 information forwarding message to AMF, namely Namf_Communication_N1N2MessageTransfer message, the message carries N2SM information, and N1SM container, namely N1SM container, wherein N2SM information also includes PDU Session ID (PDU Session ID), and more Multicast Context ID (Multicast Context ID), Multicast Group ID (TMGI, Multicast IP address), MB-SMF ID, Multicast QoS flow information (QoS flow ID and corresponding QoS information), and N1SM container also includes PDU session The modification command (PDU Session Modification Command) message includes the PDU Session ID and multicast information in the PDU Session Modification Command message. The details of the multicast information include the Multicast Context ID, the multicast QoS flow information, and the multicast address;

If SMF is configured to support unicast fallback mechanism, SMF also needs to provide the corresponding relationship between unicast QoS flow and multicast QoS flow in N2SM information and N1SM container;

In step 11, the AMF sends an N2 session modification request message to the RAN, and the message carries the content of the N2SM information in step 10; the RAN determines whether the group resource has been allocated based on the multicast group ID; if not, the RAN also needs to perform group resource allocation. distribute;

Step 12, the RAN performs RRC resource reconfiguration and forwards the N1SM container to the UE;

Step 13, the RAN allocates group resources; the RAN sends a multicast sending request message to the AMF, and the message carries the MB-SMF ID information and the multicast group ID; if the RAN uses unicast to receive multicast services, the RAN allocates downlink GTP- U TEID and downlink IP address, and carry it to AMF in the multicast sending request message;

Step 14, the AMF selects the MB-SMF according to the MB-SMF ID, and sends a multicast sending request message to the selected MB-SMF, which carries the multicast group ID and the downlink GTP-U TEID and downlink IP address allocated in step 13. ;

Step 15, if the downlink GTP-U TEID and the downlink IP address are carried in the steps 13 and 14, the MB-SMF needs to send the N4 session modification request message to the MB-UPF; the downlink GTP-U TEID and the downlink IP address are carried in the message;

Step 16, the MB-UPF sends an N4 session modification response message to the MB-SMF;

Step 17, the MB-SMF returns a multicast sending response message to the AMF;

Step 18, the AMF returns a multicast sending response message to the RAN;

Step 19, the RAN returns an N2 response message to the AMF; the N2 response message does not carry the downlink tunnel information;

In step 20, the AMF sends an N2 response message to the SMF, and the SMF decides to use the shared tunnel to transmit the multicast service, so there is no need to interact with the UPF;

Step 21, MB-UPF receives multicast data from content provider or MBF-U; MB-UPF sends multicast data to RAN;

Step 22: The RAN decides whether to use a point-to-point (PTP) transmission mode or a point-to-multi-point (PTM) transmission mode to send multicast data to the UE.

In order to request the UE to join the multicast service, the UE sends a PDU session modification request message in the above step 4. The PDU session modification request message carries TMGI. The format of TMGI is shown in Figure 4, which includes the MBMS service of 6-digit hexadecimal number. ID, and a 3-digit mobile country code (MCC) and a 2- or 3-digit mobile network code (MNC). The MCC and the MNC can identify a public land mobile network (PLMN), that is, an MCC and an MNC form a PLMN ID. A TMGI can uniquely identify an MBMS bearer entity (MBMS bear instance).

In NPN, an independent NPN (stand-alone NPN, SNPN) can be identified by a PLMN ID and a network identifier (NID). The NID contains a total of 11 hexadecimal digits, and the format is shown in Figure 5. The NID includes an allocation mode of 1 hexadecimal number and an NID value of 10 hexadecimal digits.

If the MBMS service is supported in the NPN, the TMGI sent by the terminal equipment in the NPN when requesting to join the multicast service needs to include the NID of the NPN, so as to be able to identify the NPN, however, the NID contains a total of 11 hexadecimal digits , the terminal equipment sends MBMS service ID and network identifier (including PMLN ID and NID) to request MBMS service signaling overhead is relatively large. Considering that the NPN network IDs in some operator networks are not exhausted, and/or the types of MBMS services provided are few, there may be unused bits such as NIDs and/or MBMS service IDs. Therefore, this application proposes that the network provides the terminal device with length information of the first identification information (the first identification information is used to request MBMS services), so that the terminal device can determine the length of the first identification information according to the length information, which can improve resource utilization. , to increase the flexibility of network configuration.

The solution of the present application will be described below with reference to the accompanying drawings.

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

S610, the network node determines the length of the first identification information.

The first identification information is used by the terminal device to request the MBMS service. The network node is a node in the first network. The first network provides network services for the terminal device.

In the first embodiment, the network node determines the N digits in the TMGI included in the first identification information, where the TMGI includes K digits, and N≤K.

For example, the network node may determine the number of MBMS service IDs according to the number of MBMS services, and one MBMS service ID identifies one type of MBMS service. For example, the number of MBMS services only needs 4 hexadecimal digits to indicate different MBMS service IDs, and 2 bits are not used in the 6-digit MBMS service ID. Therefore, the network node can determine that the first identification information includes 4 bits in the MBMS service ID. That is to say, the number of digits of the MBMS service ID in the TMGI identifier included in the first identifier information is 4 digits, but the present application is not limited to this.

In Embodiment 2, the network node determines M digits in the NID included in the first identification information, where the NID includes L digits, and M≤L.

Optionally, the first network is an NPN.

For example, the network node can determine the number of NIDs according to the number of existing NPNs, and one NID can represent one NPN. For example, the number of existing NPNs only needs 7 hexadecimal digits to indicate different NPNs, and 4 bits are not used in the 11-bit NID. Therefore, the network node can determine that the first identification information includes the 7-digit hexadecimal number in the NID. However, the present application is not limited to this.

Embodiment 3. The above-mentioned Embodiments 1 and 2 may be implemented in combination, and the network device may determine the N digits in the TMGI included in the first identification information, and the M digits in the NID included in the first identification information.

S620: The network node sends first information to the terminal device, where the first information is used to indicate the length of the first identification information.

Accordingly, the terminal device receives the first information from the network node. After determining the length of the first identification information in S610, the network node notifies the terminal device through the first information in S620, so that the terminal device determines the first identification information.

In the case where Embodiment 1 is adopted in S610, the first information includes first indication information, and the first indication information is used to indicate that the first identification information includes N digits in the TMGI.

Optionally, the N-bit number is a continuous N-bit number starting from the nth bit in the TMGI. Wherein, n is specified by the protocol, pre-configured by the network, or indicated by the first information, 0<n≤K, and n is an integer.

For example, the first indication information indicates N, and the protocol stipulates that N is the N digits from the lowest order to the highest order of TMGI. After receiving the first indication information, the terminal device can determine that the first identification information includes the low N digits of TMGI. . Alternatively, the protocol may stipulate that the starting bit of the N-digit number is the highest bit, and the N-digit number is the N-digit number from the highest to the lowest bit. Still alternatively, the protocol may specify that n is a bit other than the least significant bit and the most significant bit. This application does not limit this.

For another example, before sending the first information, the network device may configure the value of n for the terminal device through configuration information (for example, a radio resource control (radio resource control, RRC) message, etc.). However, the present application is not limited to this.

For another example, the first indication information indicates the identifier n of the start bit and the number of consecutive bits N. After receiving the first indication information, the terminal device may determine the N digits in the TMGI. For example, TMGI includes 11-digit hexadecimal numbers, the lowest digit in TMGI is 0, and the digit increases sequentially from low digit to high digit, and the highest digit is 10. The first indication information indicates that the identifier of the start bit is n=8, N=5, then the terminal device can determine, according to the first indication information, that the first identifier information includes the number of digits with the identifier of 8 in the TMGI as the start bit. 5 consecutive digits from high to low. However, the present application is not limited to this.

In the case where Embodiment 2 is adopted in S610, the first information includes second indication information, and the second indication information is used to indicate that the first identification information includes M digits in the NID.

Optionally, the M-bit number is a continuous M-bit number with the m-th bit of the NID as the starting bit. Wherein, m is specified by the protocol, pre-configured by the network, or indicated by the first information, 0<m≤L, and m is an integer.

The specific implementation manner is similar to the above-mentioned determination of the N-bit number in the TMGI, and the M-bit number in the NID can be determined with reference to the above description, which is not repeated here for brevity.

In the case where Embodiment 3 is adopted in S610, the first information includes the above-mentioned first indication information and second indication information.

It should be noted that the above-mentioned N number of digits may be referred to as the truncated length of TMGI, and the M number of digits may be referred to as the truncated length of NID, but the present application is not limited thereto.

As an example and not limitation, the number of digits indicated by the first indication information and/or the second indication information may be the number of binary digits, the number of decimal digits, or the number of hexadecimal digits.

One binary bit is 1 bit, and the value can be 0 or 1, the first indication information can indicate N bits, and the second indication information indicates M bits; one decimal bit is a value from 0 to 9, the first The indication information may indicate N decimal digits, and the second indication information may indicate M decimal digits; a hexadecimal digit takes a value from 0 to F, and the first indication information may indicate N hexadecimal digits, The second indication information indicates M hexadecimal digits.

S630: The terminal device determines first identification information according to the first information.

The terminal device determines, according to the first information, at least one bit in the temporary mobility group identification information included in the first identification information, and/or at least one bit in the identification information of the first network included, where the first network is for The network in which the terminal equipment provides services.

In the case where the first information includes the first indication information, the terminal device may determine, according to the first indication information, that the first identification information includes N consecutive bits starting with the nth bit in the TMGI.

In the case where the first information includes the second indication information, the terminal device may determine, according to the second indication information, that the first identification information includes M consecutive bits starting with the mth bit in the NID.

For example, the first information includes first indication information, the first indication information indicates N=7, the terminal device may determine that the first identification information includes the lower 7 digits of TMGI according to the first indication information, and the terminal device may determine the first identification The message includes the lower 7 digits in the TMGI. Optionally, the terminal device may by default include all the digits of the NID in the first identification information, and the first identification information includes 18 digits in total, including the lower 7 digits of the TMGI and all the digits of the NID. However, the present application is not limited to this.

For another example, the first information includes first indication information and second indication information, the first indication information indicates N=8, the second indication information indicates M=6, and the terminal device may determine the first identification information according to the first indication information It includes the lower 8 digits of the TMGI, and it is determined according to the second indication information that the first identification information includes the lower 6 digits of the NID. Therefore, the first identification information may include a total of 14 digits, including the lower 8 digits of the TMGI and the lower 6 digits of the NID. The format of the first identification information may be as shown in FIG. 7 , but the present application is not limited thereto.

S640, the terminal device sends an MBMS service request message, where the MBMS service request message includes the first identification information.

After determining the first identification information in S630, the terminal device may request the MBMS service by sending an MBMS service request message to the network. The MBMS service request message includes the first identification information. After receiving the MBMS service request message, the node in the network can determine the MBMS service requested by the terminal device according to the first identification information.

As an example and not limitation, the MBMS service request message is a PDU session modification request message.

It should be noted that, the communication method provided by the embodiment shown in FIG. 6 can be applied to NPN, PLMN or other networks, which is not limited in this application.

According to the above solution, the network can determine the length of the first identification information according to network conditions, and notify the terminal device through the first information, so that the terminal device can determine the length of the first identification information according to the first information. It can improve the flexibility of network configuration. The length of the first identification information is shortened according to the actual situation of the network, which can reduce signaling overhead and improve resource utilization.

Example 1

The network node in the communication method shown in FIG. 6 may be a RAN node. FIG. 8 is a schematic flowchart of Embodiment 1 of the present application.

S810, the RAN node determines the length of the first identification information.

Optionally, the RAN node may be a next generation RAN (next generation-RAN, NG-RAN) in the 5G system.

For a specific implementation manner, reference may be made to the description in S610 in FIG. 6 , which is not repeated here for brevity.

S820: The RAN node sends a first message to the terminal device, where the first message includes the first information.

Accordingly, the terminal device receives the first message from the RAN node.

In an implementation manner, the first message is a system message sent by the RAN node.

For example, after the RAN node determines the length of the first identification information in S810, the RAN node may include the first information in a broadcast system information block (system information block, SIB). But the application is not limited to this.

In another embodiment, the first message is an RRC release message or an RRC reconfiguration message sent by the RAN node.

For example, before S820, an RRC connection is established between the terminal device and the RAN node, and an access layer security connection is established. For example, the RAN node sends a security mode command to the terminal device, and the terminal device sends a network device to the network device. A secure mode complete message is sent to complete the access layer secure connection establishment. Afterwards, the RAN node sends an RRC release message to the terminal device, where the RRC release message includes the first information, or the RAN node sends an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message includes the first information. However, the present application is not limited to this.

S830, the terminal device determines first identification information according to the first information.

For a specific implementation manner, reference may be made to the description in S630, which is not repeated here for brevity.

After determining the first identification information, the terminal device may send an MBMS service request message including the first identification information to the network to request the MBMS service.

According to the above solution, the RAN node can carry the first information through the SIB, the RRC release message or the RRC reconfiguration message, so that the terminal device can determine the length of the first identification information according to the first information. It can improve the flexibility of network configuration. The length of the first identification information is shortened according to the actual situation of the network, which can reduce signaling overhead and improve resource utilization.

Embodiment 2

In the communication method shown in FIG. 6, the network node may be an AMF node. FIG. 9 is a schematic flowchart of Embodiment 2 of the present application.

S910, the terminal device sends a registration request message to the AMF node.

Correspondingly, the AMF node receives the registration request message, and determines that the terminal device requests to register with the first network, where the first network is the network where the AMF node is located.

S920, an authentication process is performed between the terminal device and the network.

S930, the AMF node sends a security mode command message to the terminal device.

Correspondingly, the terminal device receives the security mode command message from the AMF node to establish a non-access stratum (non-access stratum, NAS) security connection.

S940, the terminal device sends a security mode completion message to the AMF node

Correspondingly, the AMF node receives the security mode completion message from the terminal device, thereby completing the NAS security connection.

S950, the AMF node sends a registration acceptance message to the terminal device, where the registration acceptance message includes the first information.

Accordingly, the terminal device receives the registration accept message from the AMF node. After the NAS security connection between the terminal device and the network is established, the AMF node sends the first information to the terminal device in a registration acceptance message, which can ensure the security of the first information. This enables the terminal device to determine the first identification information after receiving the first information, so that the terminal device can request the MBMS service according to the first identification information.

S960, the terminal device sends a registration completion message to the AMF node.

Accordingly, the AMF node receives the registration complete message from the terminal device. Thus, the registration of the terminal device to the first network is completed.

According to the above solution, the AMF node can carry the first information through the registration accept message, so that the terminal device can determine the length of the first identification information according to the first information. It can improve the flexibility of network configuration. The length of the first identification information is shortened according to the actual situation of the network, which can reduce signaling overhead and improve resource utilization.

Embodiment 3

In the communication method shown in FIG. 6, the network node may be an SMF node. FIG. 10 is a schematic flowchart of Embodiment 3 of the present application.

S1010, an authentication process is performed between the terminal device and the network.

The terminal device completes the authentication process between the terminal device and the network by exchanging information with the AMF node.

S1020, the terminal device sends a PDU session establishment request message to the SMF node.

Accordingly, the SMF node receives the PDU Session Request message from the middle terminal device. The SMF node determines that the terminal device requests the establishment of a PDU session

S1030, the SMF node sends a PDU session establishment accept message to the terminal device, where the session establishment accept message includes the first information.

Accordingly, the terminal device receives the PDU session establishment accept message from the SMF node. The terminal device may determine the first identification information according to the first information in the PDU session establishment message. So that the terminal device can request the MBMS service according to the first identification information.

According to the above solution, the SMF node can carry the first information through the PDU session accept message, so that the terminal device can determine the length of the first identification information according to the first information. It can improve the flexibility of network configuration. The length of the first identification information is shortened according to the actual situation of the network, which can reduce signaling overhead and improve resource utilization.

In the above, the methods provided by the embodiments of the present application are described in detail with reference to FIG. 2 to FIG. 10 . Hereinafter, the device provided by the embodiment of the present application will be described in detail with reference to FIG. 11 to FIG. 13 .

FIG. 11 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in FIG. 11 , the communication apparatus 1100 may include a processing unit 1110 and a transceiver unit 1120 .

In a possible design, the communication apparatus 1100 may correspond to the terminal device in the above method embodiment, that is, the UE, or a chip configured (or used in) the terminal device.

It should be understood that the communication apparatus 1100 may correspond to a terminal device in the communication method provided according to the embodiment of the present application, and the communication apparatus 1100 may include a terminal for executing the methods shown in FIG. 6 , FIG. 8 , FIG. 9 , and FIG. 10 . The unit of the method that the device executes. In addition, each unit in the communication device 1100 and the above-mentioned other operations and/or functions are respectively for realizing the corresponding flow of the communication method shown in FIG. 6 , FIG. 8 , FIG. 9 , and FIG. 10 .

It should also be understood that when the communication device 1100 is a chip configured (or used in) a terminal device, the transceiver unit 1120 in the communication device 1100 may be an input/output interface or circuit of the chip, and the processing in the communication device 1100 Unit 1110 may be a processor in a chip.

Optionally, the communication apparatus 1100 may further include a processing unit 1110, and the processing unit 1110 may be configured to process instructions or data to implement corresponding operations.

Optionally, the communication device 1100 may further include a storage unit 1130, the storage unit 1130 may be used to store instructions or data, and the processing unit 1110 may execute the instructions or data stored in the storage unit, so as to enable the communication device to implement corresponding operations , the transceiver unit 1120 in the communication device 1100 in the communication device 1100 may correspond to the transceiver 1210 in the terminal device 1200 shown in FIG. 12 , and the storage unit 1130 may correspond to the terminal device 1200 shown in FIG. 12 . in the memory.

It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

It should also be understood that when the communication apparatus 1100 is a terminal device, the transceiver unit 1120 in the communication apparatus 1100 may be implemented through a communication interface (such as a transceiver or an input/output interface), for example, it may correspond to the terminal shown in FIG. 12 . The transceiver 1210 in the device 1200, the processing unit 1110 in the communication device 1100 may be implemented by at least one processor, for example, may correspond to the processor 1220 in the terminal device 1200 shown in FIG. The processing unit 1110 may be implemented by at least one logic circuit.

In another possible design, the communication device 1100 may correspond to the network node in the above method embodiments, for example, or a chip configured (or used in) the network node.

It should be understood that the communication device 1100 may correspond to a network node in the communication method according to the embodiment of the present application, and the communication device 1100 may include a network for performing the methods shown in FIG. 6 , FIG. 8 , FIG. 9 , and FIG. 10 . The unit of the method that the node executes. In addition, each unit in the communication device 1100 and the above-mentioned other operations and/or functions are respectively to implement the corresponding flow of the methods shown in FIG. 6 , FIG. 8 , FIG. 9 , and FIG. 10 .

It should also be understood that when the communication device 1100 is a chip configured (or used in) a network node, the transceiver unit in the communication device 1100 is an input/output interface or circuit in the chip, and the processing unit in the communication device 1100 1110 may be a processor in a chip.

Optionally, the communication apparatus 1100 may further include a storage unit 1130, which may be used to store instructions or data, and the processing unit may execute the instructions or data stored in the storage unit 1130 to enable the communication apparatus to implement corresponding operations. The storage unit 1130 in the communication device 1100 may correspond to the memory in the network node 1300 shown in FIG. 13 .

It should also be understood that when the communication device 1100 is a network node, the transceiver unit 1120 in the communication device 1100 may be implemented through a communication interface (such as a transceiver or an input/output interface), for example, it may correspond to the network shown in FIG. 13 . The transceiver 1310 in the node 1300, the processing unit 1110 in the communication device 1100 may be implemented by at least one processor, for example, may correspond to the processor 1320 in the network device 1300 shown in FIG. The processing unit 1110 may be implemented by at least one logic circuit.

FIG. 12 is a schematic structural diagram of a terminal device 1200 provided by an embodiment of the present application. The terminal device 1200 can be applied in the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiments. As shown, the terminal device 1200 includes a processor 1220 and a transceiver 1210 . Optionally, the terminal device 1200 further includes a memory. The processor 1220, the transceiver 1210 and the memory can communicate with each other through an internal connection path to transmit control and/or data signals, the memory is used to store computer programs, and the processor 1220 is used to execute the computer in the memory. program to control the transceiver 1210 to send and receive signals.

The above-mentioned processor 1220 can be combined with the memory to form a processing device, and the processor 1220 is configured to execute the program codes stored in the memory to realize the above-mentioned functions. During specific implementation, the memory can also be integrated in the processor 1220 or independent of the processor 1220 . The processor 1220 may correspond to the processing unit in FIG. 11 .

The transceiver 1210 described above may correspond to the transceiver unit in FIG. 11 . The transceiver 1210 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Among them, the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that the terminal device 1200 shown in FIG. 12 can implement the methods shown in FIG. 6 , FIG. 8 , FIG. 9 , and FIG. 10 involving various processes of the terminal device. The operations and/or functions of each module in the terminal device 1200 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

The above-mentioned processor 1220 may be used to perform the actions described in the foregoing method embodiments that are implemented inside the terminal device, and the transceiver 1210 may be used to execute the actions described in the foregoing method embodiments that the terminal device sends to or receives from the network node. action. For details, please refer to the descriptions in the foregoing method embodiments, which will not be repeated here.

Optionally, the above-mentioned terminal device 1200 may further include a power supply for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, the terminal device 1200 may also include one or more of an input unit, a display unit, an audio circuit, a camera, a sensor, etc., and the audio circuit may also include a speaker, a microphone, etc. Wait.

FIG. 13 is a schematic structural diagram of a network device provided by an embodiment of the present application. The network device 1300 may be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiments. As shown, the network device 1300 includes a processor 1320 and a transceiver 1310. Optionally, the network device 1300 further includes a memory. The processor 1320, the transceiver 1310 and the memory can communicate with each other through an internal connection path to transmit control and/or data signals, the memory is used to store computer programs, and the processor 1320 is used to execute the computer in the memory. program to control the transceiver 1310 to send and receive signals.

It should be understood that the network device 1300 shown in FIG. 13 can implement the methods shown in FIG. 6 , FIG. 8 , FIG. 9 , and FIG. 10 involving various processes of the network device. The operations and/or functions of each module in the network device 1300 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

It should be understood that the network device 1300 shown in FIG. 13 is only a possible architecture of the network device, and should not constitute any limitation to the present application. The methods provided in this application may be applicable to network devices of other architectures. For example, network equipment including CU, DU, and AAU, etc. This application does not limit the specific architecture of the network device.

An embodiment of the present application further provides a processing apparatus, including a processor and an interface, where the processor is configured to execute the method in any of the foregoing method embodiments.

It should be understood that the above-mentioned processing device may be one or more chips. For example, the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or a It is a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips.

In the implementation process, each step of the above-mentioned method can be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature 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. To avoid repetition, detailed description is omitted here.

It should be noted that the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The aforementioned processors may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components . The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature 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.

It can be understood that the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts 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 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 (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

For the method provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is executed by one or more processors, makes the device including the processor The method in the above embodiment is performed.

According to the methods provided by the embodiments of the present application, the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores program codes, and when the program codes are executed by one or more processors, the processing includes the processing The device of the controller executes the method in the above-mentioned embodiment.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the aforementioned one or more network devices. The system may further include one or more of the aforementioned terminal devices.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into Another system, or some features can be ignored, or not implemented. On the other hand, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of modules may be in electrical, mechanical or other forms.

In the specific implementation of the above-mentioned terminal equipment and network equipment, it should be understood that the processor may be a central processing unit (English: Central Processing Unit, referred to as: CPU), or other general-purpose processors, digital signal processors (English: Digital Signal Processor, referred to as: DSP), application specific integrated circuit (English: Application Specific Integrated Circuit, referred to as: ASIC) and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps in combination with the method disclosed in the present application can be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

All or part of the steps for implementing the above method embodiments may be completed by program instructions related to hardware. The aforementioned program can be stored in a readable memory. When the program is executed, the steps including the above method embodiments are executed; and the aforementioned memory (storage medium) includes: read-only memory (English: read-only memory, abbreviated as: ROM), RAM, flash memory, hard disk, Solid state drive, magnetic tape (English: magnetic tape), floppy disk (English: floppy disk), optical disc (English: optical disc) and any combination thereof.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

A communication method, characterized in that the method comprises:

The terminal device receives first information, where the first information is used to indicate the length of the first identification information, and the first identification information is used by the terminal device to request a multimedia broadcast multicast service;

The terminal device determines, according to the first information, at least one bit in the temporary mobility group identification information included in the first identification information, and/or at least one bit in the identification information of the first network included, The first network is a network serving the terminal device.
The method according to claim 1, wherein the first information includes first indication information, and the first indication information is used to indicate that the first identification information includes the temporary mobile group identification information. N digits, wherein the temporary mobile group identifier includes K digits, N and K are positive integers, and N≤K.
The method according to claim 2, wherein the N-digit number is a continuous N-digit number with the n-th bit in the temporary mobile identification information as a starting position,

Wherein, the n is specified by the protocol, preconfigured or indicated by the first information, 0<n≤K, and n is an integer.
The method according to any one of claims 1 to 3, wherein the first information includes second indication information, and the second indication information is used to indicate that the first identification information includes the first identification information. M digits in the identification information of a network, wherein the identification information of the first network includes L digits, M and L are positive integers, and M≤L.
The method according to claim 4, wherein the M number of digits is a continuous M number of digits with the mth position in the identification information of the first network as a starting position,

Wherein, the m is specified by the protocol, pre-configured or indicated by the first information, 0<m≤L, and m is an integer.
The method according to any one of claims 1 to 5, wherein the number of digits is the number of binary digits, the number of decimal digits, or the number of hexadecimal digits.
The method according to any one of claims 1 to 6, wherein the first information comes from an access network node.
The method of claim 7, wherein the first information is carried in one or more of the following messages from the access network node:

System messages, RRC release messages and RRC reconfiguration messages.
The method according to claim 7 or 8, wherein the terminal device receives the first information, comprising:

The terminal device receives the first information after establishing a secure connection with the access network node.
The method according to any one of claims 1 to 6, wherein the first information comes from an access and mobility management function AMF node.
The method of claim 10, wherein the first information is carried in a registration accept message from the AMF node.
The method according to claim 10 or 11, wherein the terminal device receives the first information, comprising:

The terminal device receives the first information after establishing a secure connection with the AMF node.
The method according to any one of claims 1 to 6, wherein the first information comes from a session management function (SMF) node.
The method according to claim 13, wherein the first information is carried in a protocol data unit (PDU) session establishment accept message from the SMF node.
The method according to any one of claims 1 to 14, wherein the first network is a non-public network.
A communication method, characterized in that it is applied to a terminal device, the method comprising:

The first network node determines the length of the first identification information, the first identification information is used for the terminal device to request the multimedia broadcast multicast service, and the first identification information includes at least one bit in the temporary mobile group identification information and/or the first identification information. At least one bit in the identification information of a network, the first network is a network that provides services for the terminal device;

The first network node sends first information to the terminal device, where the first information is used to indicate the length of the first identification information.
The method according to claim 16, wherein the first information includes first indication information, and the first indication information is used to indicate that the first identification information includes the temporary mobile group identification information. N digits, wherein the temporary mobile group identifier includes K digits, N and K are positive integers, and N≤K.
The method according to claim 17, wherein the N-digit number is a continuous N-digit number with the nth bit in the temporary mobile identification information as a starting bit,

Wherein, the n is specified by the protocol, preconfigured or indicated by the first information, 0<n≤K, and n is an integer.
The method according to any one of claims 16 to 18, wherein the first information includes second indication information, and the second indication information is used to indicate that the first identification information includes the first identification information. M digits in the identification information of a network, wherein the identification information of the first network includes L digits, M and L are positive integers, and M≤L.
The method according to claim 19, wherein the M number of digits is a continuous M number of digits with the mth position in the identification information of the first network as a starting position,

Wherein, the m is specified by the protocol, pre-configured or indicated by the first information, 0<m≤L, and m is an integer.
The method according to any one of claims 16 to 20, wherein the number of digits is the number of binary digits, the number of decimal digits, or the number of hexadecimal digits.
The method according to any one of claims 16 to 21, wherein the first network node is an access network node of the first network.
The method according to claim 22, wherein the first information is carried in one or more of the following messages sent by the access network node:

System messages, RRC release messages and RRC reconfiguration messages.
The method according to claim 22 or 23, wherein the first information sent by the first network node to the terminal device comprises:

After establishing a secure connection with the terminal device, the access network node sends the first information to the terminal device.
21. The method according to any one of claims 16 to 21, wherein the first network node is an Access and Mobility Management Function AMF node.
The method according to claim 25, wherein the first information is carried in a registration accept message sent by the AMF node.
The method according to claim 25 or 26, wherein the first information sent by the first network node to the terminal device comprises:

After establishing a secure connection with the terminal device, the AMF node sends the first information to the terminal device.
The method according to any one of claims 16 to 21, wherein the first network node is a session management function SMF node.
The method according to claim 28, wherein the first information is carried in a protocol data unit (PDU) session establishment accept message sent by the SMF node.
The method of any one of claims 16 to 29, wherein the first network is a non-public network.
A communication device, characterized in that it is applied to terminal equipment, the device comprising:

a transceiver unit, configured to receive first information, where the first information is used to indicate the length of the first identification information, and the first identification information is used by the terminal device to request a multimedia broadcast multicast service;

A processing unit, configured to determine, according to the first information, at least one bit in the temporary mobile group identification information included in the first identification information, and/or at least one bit in the identification information of the first network included in the first identification information , the first network is a network that provides services for the terminal device.
The apparatus according to claim 31, wherein the first information includes first indication information, and the first indication information is used to indicate that the first identification information includes the temporary mobile group identification information. N digits, wherein the temporary mobile group identifier includes K digits, N and K are positive integers, and N≤K.
The device according to claim 32, wherein the N-digit number is a continuous N-digit number with the n-th bit in the temporary mobile identification information as a starting bit,

Wherein, the n is specified by the protocol, preconfigured or indicated by the first information, 0<n≤K, and n is an integer.
The apparatus according to any one of claims 31 to 33, wherein the first information includes second indication information, and the second indication information is used to indicate that the first identification information includes the first identification information. M digits in the identification information of a network, wherein the identification information of the first network includes L digits, M and L are positive integers, and M≤L.
The device according to claim 34, wherein the M number of bits is a continuous M number of bits with the mth bit in the identification information of the first network as a starting bit,

Wherein, the m is specified by the protocol, pre-configured or indicated by the first information, 0<m≤L, and m is an integer.
The device according to any one of claims 31 to 35, wherein the number of digits is the number of binary digits, the number of decimal digits, or the number of hexadecimal digits.
The apparatus according to any one of claims 31 to 36, wherein the first information comes from an access network node.
The apparatus of claim 37, wherein the first information is carried in one or more of the following messages from the access network node:

System messages, RRC release messages and RRC reconfiguration messages.
The device according to claim 37 or 38, characterized in that,

The transceiver unit is specifically configured to receive the first information after the terminal device establishes a secure connection with the access network node.
The apparatus according to any one of claims 31 to 36, wherein the first information comes from an access and mobility management function AMF node.
The apparatus of claim 37, wherein the first information is carried in a registration accept message from the AMF node.
The device according to claim 40 or 41, characterized in that,

The transceiver unit is specifically configured to receive the first information after the terminal device establishes a secure connection with the AMF node.
The apparatus according to any one of claims 31 to 36, wherein the first information comes from a session management function (SMF) node.
The apparatus of claim 43, wherein the first information is carried in a protocol data unit (PDU) session establishment accept message from the SMF node.
The apparatus of any one of claims 31 to 44, wherein the first network is a non-public network.
A communication device, comprising:

a processing unit, configured to determine the length of the first identification information, the first identification information is used for the terminal device to request the multimedia broadcast multicast service, and the first identification information includes at least one bit in the temporary mobile group identification information and/or at least one bit in the identification information of the first network, where the first network is a network that provides services for the terminal device;

A transceiver unit, configured to send first information to the terminal device, where the first information is used to indicate the length of the first identification information.
The apparatus according to claim 46, wherein the first information includes first indication information, and the first indication information is used to indicate that the first identification information includes the temporary mobile group identification information. N digits, wherein the temporary mobile group identifier includes K digits, N and K are positive integers, and N≤K.
The device according to claim 47, wherein the N-digit number is a continuous N-digit number with the nth bit in the temporary mobile identification information as a starting bit,

Wherein, the n is specified by the protocol, preconfigured or indicated by the first information, 0<n≤K, and n is an integer.
The apparatus according to any one of claims 46 to 48, wherein the first information includes second indication information, and the second indication information is used to indicate that the first identification information includes the first identification information. M digits in the identification information of a network, wherein the identification information of the first network includes L digits, M and L are positive integers, and M≤L.
The device according to claim 49, wherein the M number of bits is a continuous M number of bits with the mth bit in the identification information of the first network as a starting bit,

Wherein, the m is specified by the protocol, pre-configured or indicated by the first information, 0<m≤L, and m is an integer.
The device according to any one of claims 46 to 50, wherein the number of digits is the number of binary digits, the number of decimal digits, or the number of hexadecimal digits.
The apparatus according to any one of claims 46 to 51, wherein the first network node is an access network node of the first network.
The apparatus according to claim 52, wherein the first information is carried in one or more of the following messages sent by the access network node:

System messages, RRC release messages and RRC reconfiguration messages.
The device of claim 52 or 53, wherein:

The transceiver unit is specifically configured to send the first information to the terminal device after the access network node establishes a secure connection with the terminal device.
The apparatus of any one of claims 46 to 51, wherein the first network node is an Access and Mobility Management Function AMF node.
The apparatus according to claim 55, wherein the first information is carried in a registration accept message sent by the AMF node.
The device according to claim 55 or 56, characterized in that,

The transceiver unit is specifically configured to send the first information to the terminal device after the AMF node establishes a secure connection with the terminal device.
51. The apparatus of any one of claims 46 to 51, wherein the first network node is a session management function (SMF) node.
The apparatus according to claim 58, wherein the first information is carried in a protocol data unit (PDU) session establishment accept message sent by the SMF node.
The apparatus of any one of claims 46 to 59, wherein the first network is a non-public network.
A communication device, comprising:

Processor, memory, interface for communication with terminal equipment;

the memory stores computer-executable instructions;

The processor executes computer-implemented instructions stored in the memory, causing the processor to perform the communication method of any one of claims 1 to 30.
A computer-readable storage medium, characterized by comprising a computer program that, when executed by one or more processors, causes an apparatus comprising the processors to perform the method according to any one of claims 1 to 30 method.
A computer program product, characterized in that the computer program product comprises: a computer program, which, when the computer program is executed, causes a computer to execute the method according to any one of claims 1 to 30.
A chip, characterized in that it includes at least one processor and a communication interface;

The communication interface is used to receive signals input to the chip or signals output from the chip, and the processor communicates with the communication interface and executes a logic circuit or executes code instructions for implementing as in claims 1 to 30 The method of any one.