Data transmission method and device

Abstract

The present application provides a data transmission method and apparatus, including: an access network device receives first indication information sent by a terminal device, the first indication information indicating an identifier of a data packet of a multicast service received by the terminal device; the access network device determines a target data packet based on the first indication information; and the access network device transmits the target data packet to the terminal device. The terminal device reports the identifier of the data packet of the received multicast service, so that the access network device can determine a data packet of the multicast service that has been transmitted but not received by the terminal device based on the identifier. The access network device can retransmit the data packet that has not been received by the terminal device to the terminal device, so that the terminal device can receive the data packet of the multicast service that it has missed receiving.

Description

[Technical field]

[0001] This application claims priority to Chinese Patent Application No. 2021 / 071902, entitled "DATA TRANSMISSION METHOD AND APPARATUS," filed with the State Intellectual Property Office of the People's Republic of China on January 14, 2021, which is hereby incorporated by reference in its entirety.

[0002] The present application relates to the field of communications, and in particular to a data transmission method and device. [Background technology]

[0003] Multimedia broadcast multicast service (MBMS) or multicast / multicast broadcast service (MBS) is mainly applicable to services aimed at multiple user equipments (UEs), such as live broadcasting and scheduled program playback. Multicast transmission technology is a technology in which MBS services are transmitted to multiple UEs simultaneously through a base station. MBS services may be transmitted to UEs in unicast mode by a network device by establishing a UE-dedicated bearer, or may be transmitted to UEs in multicast mode by establishing a MBS service-dedicated bearer. When multiple UEs need to receive the MBS service, if the MBS service is transmitted in unicast mode, bearers dedicated to multiple UEs need to be established, and such a mode consumes resources, whereas if the MBS service is transmitted to UEs in multicast mode, only a MBS-dedicated bearer needs to be established, and all UEs involved in the service can receive the MBS through the bearer. This reduces air interface resources, improves spectrum utilization, and improves transmission efficiency.

[0004] However, in the multicast and broadcast service, the efficiency of sending a paging indication message from the core network to the base station and then to the UE is too low, and the paging indication message must be triggered for each UE in the group. In addition, the time when the core network / base station starts to send data of the multicast service is unclear. If the UE accesses the network after the core network or base station starts to send data of the multicast service, the UE may miss receiving data of the multicast service sent before the UE accesses the network.

[0005] Therefore, how to optimize the multicast service is a problem to be solved. Summary of the Invention

[0006] The present application provides a data transmission method and apparatus for retransmitting multicast service data that is missed because a terminal equipment does not access an access network device in a timely manner or because a terminal equipment does not receive the multicast service data in a timely manner. [Means for solving the problem]

[0007] According to a first aspect, there is provided a data transmission method. The method includes:

[0008] Referring to the first aspect, in some implementations of the first aspect, an access network device receives first indication information transmitted by a terminal equipment, the first indication information indicating an identifier of a data packet received by the terminal equipment and belonging to a multicast service, the access network device determines a target data packet based on the first indication information, and the access network device transmits the target data packet to the terminal equipment.

[0009] Based on the aforementioned solution, the terminal equipment reports the identifiers of the data packets of the multicast service, so that the access network device can determine the data packets of the multicast service that have been sent but not received by the terminal equipment, i.e. the target data packets, based on the identifier information, and the access network device can retransmit the target data packets to the terminal equipment, thus allowing the terminal equipment to receive the data packets of the multicast service that it has missed.

[0010] Referring to the first aspect, in some implementations of the first aspect, the identifier of a data packet belonging to a multicast service and received at a terminal device is a sequence number of a data packet belonging to a multicast service and received at the terminal device in Point to multipoint (PTM) mode.

[0011] Referring to the first aspect, in some implementations of the first aspect, the sequence number of the target data packet is of a multicast service and is smaller than the sequence number of a data packet received in PTM mode by the terminal equipment.

[0012] Referring to the first aspect, in some implementations of the first aspect, the sequence number of a data packet of a multicast service received in PTM mode at a terminal device is the sequence number of a first data packet of a multicast service received in PTM mode at a terminal device.

[0013] It should be understood that the terminal equipment can transmit to the access network device the sequence number of the first data packet of the multicast service received in PTM mode at the terminal equipment, the sequence number of the received data packet with the smallest sequence number, or the sequence numbers of all received data packets, which is not limited in this application.

[0014] Referring to the first aspect, in some implementations of the first aspect, the step of the access network device transmitting the target data packet to the terminal equipment includes the access network device transmitting the target data packet to the terminal equipment in a point-to-point (PTP) mode.

[0015] Referring to the first aspect, in some implementations of the first aspect, the access network device receives second indication information sent by the core network device, the second indication information indicating that the terminal equipment requires reception of data packets of a multicast service, the access network device generates target configuration information based on the second indication information, the target configuration information is configuration information of the multicast service of the terminal equipment, and the access network device transmits the target configuration information to the terminal equipment.

[0016] Referring to the first aspect, in some implementations of the first aspect, the configuration information of the multicast service of the terminal device includes PTM mode configuration information and PTP mode configuration information.

[0017] Referring to the first aspect, in some implementations of the first aspect, the access network device sends first request information to the core network device, and the first request information is used to request the core network device to send second indication information.

[0018] Referring to the first aspect, in some implementations of the first aspect, the access network device transmits second request information to the terminal equipment, and the second request information is used to request the terminal equipment to report the first indication information.

[0019] According to a second aspect, there is provided a data transmission method, comprising the steps of: a terminal device transmitting first indication information to an access network device, the first indication information indicating an identifier of a data packet received by the terminal device and being of a multicast service; and the terminal device receiving a target data packet transmitted by the access network device.

[0020] Based on the aforementioned solution, the terminal equipment reports the identifiers of the data packets of the multicast service, so that the access network device can determine the data packets of the multicast service that have been sent but not received by the terminal equipment, i.e. the target data packets, based on the identifier information, and the access network device can retransmit the target data packets to the terminal equipment, thus allowing the terminal equipment to receive the data packets of the multicast service that it has missed.

[0021] Referring to the second aspect, in some implementations of the second aspect, the identifier of a data packet belonging to a multicast service and received at a terminal device is a sequence number of a data packet belonging to a multicast service and received at the terminal device in PTM mode.

[0022] Referring to the second aspect, in some implementations of the second aspect, the sequence number of the target data packet is smaller than the sequence number of the data packet of the multicast service received in the terminal equipment in PTM mode.

[0023] Referring to the second aspect, in some implementations of the second aspect, the sequence number of a data packet of a multicast service received in PTM mode at a terminal device is the sequence number of a first data packet of the multicast service received in PTM mode at the terminal device.

[0024] It should be understood that the terminal equipment can transmit to the access network device the sequence number of the first data packet of the multicast service received in PTM mode at the terminal equipment, the sequence number of the received data packet with the smallest sequence number, or the sequence numbers of all received data packets, which is not limited in this application.

[0025] Referring to the second aspect, in some implementations of the second aspect, the terminal device receives the target data packet transmitted by the terminal device in a PTP mode.

[0026] Referring to the second aspect, in some implementations of the second aspect, a terminal device receives target configuration information transmitted by an access network device, and the target configuration information is configuration information of a multicast service of the terminal device.

[0027] Referring to the second aspect, in some implementations of the second aspect, the configuration information of the multicast service of the terminal device includes PTM mode configuration information and PTP mode configuration information.

[0028] Referring to the second aspect, in some implementations of the second aspect, the terminal equipment receives second request information sent by the access network device, and the second request information is used to request the terminal equipment to report the first indication information.

[0029] According to a third aspect, there is provided a data transmission method, comprising the steps of: a core network device generating first information, the first information including a service identifier of a multicast service and first parameter information, the first parameter information including at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal device in a first set of terminal devices, the first set of terminal devices including at least two terminal devices, and the core network device transmitting the first information to an access network device.

[0030] Based on the above-mentioned solution, the core network device generates first information, the first information includes a service identifier of the multicast service and at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal device, and then the core network device sends the first information to the access network device. The access network device can determine a paging occasion based on the first information, so that the access network device can deliver the second information at the paging time. Thus, the efficiency of sending a paging indication message is improved.

[0031] Referring to the third aspect, in some implementations of the third aspect, the first information further includes second parameter information, the second parameter information including at least one of common paging priority information and common tracking area identity list information for each terminal equipment in the second set of terminal equipment, the second set of terminal equipment including at least two terminal equipment, and the second set of terminal equipment belonging to the first set of terminal equipment.

[0032] Based on the above-mentioned solution, the first information includes at least one of the common paging priority information and the common tracking area identity list information of each terminal device in the set of the second terminal device, that is, the paging priority information or the common tracking area identity list information of all terminal devices in the set of the second terminal device is the same, so that the access network device only needs to deliver the second information once, so that each terminal device in the set of the second terminal device can receive the second information, which greatly improves the efficiency of sending the paging indication message and reduces the signaling cost.

[0033] According to a fourth aspect, there is provided a data transmission method. The method includes:

[0034] The method includes the steps of: an access network device receiving first information transmitted by a core network device, the first information including a service identifier of a multicast service and first parameter information, the first parameter information including at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal equipment in a first set of terminal equipment, the first set of terminal equipment including at least two terminal equipment; determining, by the access network device, a transmission time of second information based on the first information, the second information including service identifier information of the multicast service; and a step of the access network device transmitting the second information to the first terminal equipment at the transmission time of the second information, the first terminal equipment belonging to the first set of terminal equipment.

[0035] Based on the above-mentioned solution, the access network device receives the first information sent by the core network device, and the first information includes a service identifier of the multicast service and at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal device. The access network device can determine a paging occasion based on the first information, so that the access network device can deliver the second information at the paging time. Thus, the efficiency of sending the paging indication message is improved.

[0036] Referring to the fourth aspect, in some implementations of the fourth aspect, the first information further includes a second parameter, the second parameter information includes at least one of paging priority information and tracking area identity list information for each terminal equipment in the second set of terminal equipment, the tracking area identity list information of all terminal equipment in the second set of terminal equipment is the same, the second set of terminal equipment includes at least two terminal equipment, and the second set of terminal equipment belongs to the first set of terminal equipment.

[0037] Based on the above-mentioned solution, the first information includes at least one of the common paging priority information and the common tracking area identity list information of each terminal device in the set of the second terminal device, that is, the paging priority information or the common tracking area identity list information of all terminal devices in the set of the second terminal device is the same, so that the access network device only needs to centrally distribute the second information once, so that each terminal device in the set of the second terminal device can receive the second information, which greatly improves the efficiency of sending the paging indication message and reduces the signaling cost.

[0038] Referring to the fourth aspect, in some implementations of the fourth aspect, the second information is centrally transmitted by the access network device to terminal equipment in the second set of terminal equipment.

[0039] According to a fifth aspect, there is provided a data transmission method, comprising: a step of a core network device determining a transmission time of a data packet of a multicast service based on parameter information, the parameter information including at least one of delay information of the multicast service of a terminal device of the multicast group, reliability information of the multicast service of the terminal device of the multicast group, discontinuous reception cycle information of the terminal device of the multicast group, and a ratio of the number of terminal devices of the multicast group to the number of terminal devices of the multicast group accessing the access network device; and a step of the core network device transmitting the data packet of the multicast service to the access network device at the transmission time.

[0040] Based on the above-mentioned solution, the core network device determines the transmission time of the data packet of the multicast service based on the parameter information, so that the efficiency of transmitting the data of the multicast service can be improved and the flexibility of the data transmission of the multicast service can be enhanced.

[0041] Referring to the fifth aspect, in some implementations of the fifth aspect, the step of a core network device determining a transmission time of a data packet of a multicast service based on delay information of the multicast service of a terminal equipment of a multicast group includes:

[0042] The core network device determines the transmission time of the data packets of the multicast service based on the delay requirements of the multicast service of the terminal equipments in the multicast group.

[0043] Referring to the fifth aspect, in some implementations of the fifth aspect, the step of the core network device determining a transmission time of a data packet of the multicast service based on reliability information of the multicast service of a terminal equipment of the multicast group includes the core network device determining a transmission time of the data packet of the multicast service based on reliability requirements of the multicast service of the terminal equipment of the multicast group.

[0044] Referring to the fifth aspect, in some implementations of the fifth aspect, the step of the core network device determining a transmission time of a data packet of the multicast service based on discontinuous reception cycle information of a terminal equipment of the multicast group includes the core network device determining the transmission time of the data packet of the multicast service when the terminal equipment of the multicast group completes one discontinuous reception cycle.

[0045] Referring to the fifth aspect, in some implementations of the fifth aspect, the step of the core network device determining a transmission time of a data packet of the multicast service based on a ratio of the number of terminal equipment of the multicast group to the number of terminal equipment of the multicast group that is in the multicast group and accessing the access network device includes the core network device determining a transmission time of a data packet of the multicast service when the ratio of the number of terminal equipment of the multicast group to the number of terminal equipment of the multicast group that is in the multicast group and accessing the access network device is greater than a preset threshold.

[0046] According to a sixth aspect, a data transmission device is provided, comprising: a transceiver module configured to receive first indication information transmitted by a terminal device, the first indication information indicating identifiers of data packets of a multicast service received at the terminal device; and a processing module configured to determine a target data packet based on the first indication information. The transceiver module is further configured to transmit the target data packet to the terminal device.

[0047] For the beneficial effects brought about by the aforementioned data transmission device, please refer to the specific description of the first aspect, and for the sake of brevity, the details will not be described again here.

[0048] Referring to the sixth aspect, in some implementations of the sixth aspect, the identifier of a data packet belonging to a multicast service and received at the terminal equipment is a sequence number of a data packet belonging to a multicast service and received at the terminal equipment in point-to-multipoint PTM mode.

[0049] Referring to the sixth aspect, in some implementations of the sixth aspect, the sequence number of the target data packet is of a multicast service and is smaller than the sequence number of a data packet received in PTM mode by the terminal equipment.

[0050] Referring to the sixth aspect, in some implementations of the sixth aspect, the sequence number of a data packet of a multicast service received in PTM mode at a terminal device is the sequence number of a first data packet of a multicast service received in PTM mode at a terminal device.

[0051] Referring to the sixth aspect, in some implementations of the sixth aspect, the transceiver module is specifically configured to transmit the target data packet to the terminal equipment in a point-to-point PTP mode.

[0052] Referring to the sixth aspect, in some implementations of the sixth aspect, the transceiver module is specifically configured to receive second indication information sent by the core network device, the second indication information indicating that the terminal device needs to receive data packets of the multicast service. The processing module is specifically configured to generate target configuration information based on the second indication information, the target configuration information being configuration information of the multicast service of the terminal device. The transceiver module is further specifically configured to transmit the target configuration information to the terminal device.

[0053] Referring to the sixth aspect, in some implementations of the sixth aspect, the configuration information of the multicast service of the terminal device includes PTM mode configuration information and PTP mode configuration information.

[0054] Referring to the sixth aspect, in some implementations of the sixth aspect, the transceiver module is further configured to transmit first request information to the core network device, where the first request information is used to request the core network device to transmit second instruction information.

[0055] Referring to the sixth aspect, in some implementations of the sixth aspect, the transceiver module is further configured to transmit second request information to the terminal equipment, and the second request information is used to request the terminal equipment to report the first indication information.

[0056] According to a seventh aspect, there is provided a data transmission apparatus, comprising: a transceiver module configured to transmit first indication information to an access network device, the first indication information indicating an identifier of a data packet received at a terminal equipment, the data packet being of a multicast service, and to receive a target data packet transmitted by the access network device.

[0057] For the beneficial effects brought about by the aforementioned data transmission device, please refer to the specific description of the second aspect, and for the sake of brevity, the details will not be described again here.

[0058] Referring to the seventh aspect, in some implementations of the seventh aspect, the identifier of a data packet belonging to a multicast service and received at a terminal device is a sequence number of a data packet belonging to a multicast service and received at the terminal device in PTM mode.

[0059] Referring to the seventh aspect, in some implementations of the seventh aspect, the sequence number of the target data packet is of a multicast service and is smaller than the sequence number of a data packet received in PTM mode by the terminal equipment.

[0060] Referring to the seventh aspect, in some implementations of the seventh aspect, the sequence number of a data packet of a multicast service received in PTM mode at a terminal device is the sequence number of a first data packet of the multicast service received in PTM mode at the terminal device.

[0061] Referring to the seventh aspect, in some implementations of the seventh aspect, the transceiver module is specifically configured to receive the target data packet transmitted by the terminal equipment in a PTP mode.

[0062] Referring to the seventh aspect, in some implementations of the seventh aspect, the transceiver module is further specifically configured to receive target configuration information transmitted by the access network device, wherein the target configuration information is configuration information of a multicast service of the terminal equipment.

[0063] Referring to the seventh aspect, in some implementations of the seventh aspect, the configuration information of the multicast service of the terminal device includes PTM mode configuration information and PTP mode configuration information.

[0064] Referring to the seventh aspect, in some implementations of the seventh aspect, the transceiver module is further specifically configured to receive second request information transmitted by the access network device, wherein the second request information is used to request the terminal equipment to report the first indication information.

[0065] According to an eighth aspect, a data transmission apparatus is provided, comprising: a processing module configured to generate first information, the first information including a service identifier of a multicast service and first parameter information, the first parameter information including at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal device in a first set of terminal devices, the first set of terminal devices including at least two terminal devices, and a transceiver module configured to transmit the first information to an access network device.

[0066] For the beneficial effects brought about by the aforementioned data transmission device, please refer to the specific description of the third aspect, and for the sake of brevity, the details will not be described again here.

[0067] Referring to the eighth aspect, in some implementations of the eighth aspect, the first information further includes second parameter information, the second parameter information including at least one of common paging priority information and common tracking area identity list information for each terminal device in the second set of terminal devices, the second set of terminal devices including at least two terminal devices, and the second set of terminal devices belonging to the first set of terminal devices.

[0068] According to a ninth aspect, a data transmission apparatus is provided, comprising: a transceiver module configured to receive first information transmitted by a core network device, the first information including service identifier information of a multicast service and first parameter information, the first parameter information including at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal equipment in a first set of terminal equipment, the first set of terminal equipment including at least two terminal equipment; and a processing module configured to determine a transmission time of second information to an access network device based on the first information, the second information including service identifier information of the multicast service. The transceiver module is further configured to transmit the second information to the first terminal equipment, the first terminal equipment belonging to the first set of terminal equipment.

[0069] Referring to the ninth aspect, in some implementations of the ninth aspect, the first information further includes a second parameter, the second parameter information includes at least one of paging priority information and tracking area identity list information for each terminal equipment in the second set of terminal equipment, the tracking area identity list information of all terminal equipment in the second set of terminal equipment is the same, the second set of terminal equipment includes at least two terminal equipment, and the second set of terminal equipment belongs to the first set of terminal equipment.

[0070] Referring to the ninth aspect, in some implementations of the ninth aspect, the second information is centrally transmitted by the access network device to terminal equipment in the second set of terminal equipment.

[0071] For the beneficial effects brought about by the aforementioned data transmission device, please refer to the specific description of the fourth aspect, and for the sake of brevity, the details will not be described again here.

[0072] According to a tenth aspect, a data transmission device is provided, comprising: a processing module configured to determine a transmission time of a data packet of a multicast service based on parameter information, the parameter information including at least one of delay information of the multicast service of terminal equipment of the multicast group, reliability information of the multicast service of terminal equipment of the multicast group, discontinuous reception cycle information of terminal equipment of the multicast group, and a ratio of the number of terminal equipment of the multicast group to the number of terminal equipment of the multicast group accessing the access network device. The core network device transmits the data packet of the multicast service to the access network device at the transmission time.

[0073] For the beneficial effects brought about by the aforementioned data transmission device, please refer to the specific description of the fifth aspect, and for the sake of brevity, the details will not be described again here.

[0074] Referring to the tenth aspect, in some implementations of the tenth aspect, the processing module is specifically configured to determine a transmission time of a data packet of a multicast service for a terminal device of the multicast group based on a delay requirement of the multicast service.

[0075] Referring to the tenth aspect, in some implementations of the tenth aspect, the processing module is further configured to determine a transmission time of a data packet of the multicast service based on a reliability requirement of the multicast service of a terminal equipment of the multicast group.

[0076] Referring to the tenth aspect, in some implementations of the tenth aspect, the processing module is further configured to determine a transmission time of a data packet of the multicast service when a terminal device of the multicast group completes one discontinuous reception cycle.

[0077] Referring to the tenth aspect, in some implementations of the tenth aspect, the processing module is further configured to determine a transmission time of a data packet of the multicast service when a ratio of a number of terminal devices of a multicast group accessing the access network device to a number of terminal devices of the multicast group is greater than a preset threshold.

[0078] According to an eleventh aspect, there is provided a data transmission device including a processor. The processor may be coupled to a memory and configured to execute instructions in the memory to implement the data transmission method in any one of the first to fifth aspects and possible implementations of the first to fifth aspects. Optionally, the data transmission device further includes the memory. Optionally, the data transmission device further includes a communication interface, the processor is coupled to the communication interface, and the communication interface is configured to input and / or output information. The information includes at least one of instructions and data.

[0079] In one embodiment, the data transmission device is a network device. When the data transmission device is a network device, the communication interface may be a transceiver or an input / output interface.

[0080] In another embodiment, the data processing device is a chip or chip system. When the data transmission device is a chip or chip system, the communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, an associated circuit, etc. on the chip or chip system. Alternatively, the processor may be a processing circuit or a logic circuit.

[0081] In another embodiment, the data transmission apparatus is a chip or chip system configured within a network device.

[0082] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0083] According to a twelfth aspect, there is provided a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a communication device, the data processing device is enabled to perform a data transmission method according to any one of the first to fifth aspects and possible implementations of the first to fifth aspects.

[0084] According to a thirteenth aspect, there is provided a computer program product comprising instructions which, when executed by a computer, enable a communication device to perform the data transmission methods provided in the first to fifth aspects. [Brief description of the drawings]

[0085] [Figure 1] 1 is a schematic diagram of a wireless communication system 100 applicable to an embodiment of the present application. [Diagram 2] 1 is a schematic diagram of a wireless communication system 200 applicable to an embodiment of the present application. [Diagram 3] 3 is a schematic flow diagram of a data transmission method 300 according to an embodiment of the present application. [Figure 4] 4 is a schematic interaction diagram of a data transmission method 400 according to an embodiment of the present application. [Diagram 5] 5 is a schematic interaction diagram of a data transmission method 500 according to an embodiment of the present application. [Figure 6A] 6 is a schematic interaction diagram of a data transmission method 600 according to an embodiment of the present application. [Figure 6B] 6 is a continuation of the schematic interaction diagram of a data transmission method 600 according to an embodiment of the present application. [Figure 7] 7 is a schematic block diagram of a communication device 700 applicable to an embodiment of the present application. [Figure 8] 8 is a schematic diagram of the architecture of a communication device 800 applicable to an embodiment of the present application. [Figure 9] 9 is a schematic diagram of the structure of a communication device 900 applicable to an embodiment of the present application. [Figure 10] 1 is a schematic diagram of the architecture of a communication device 1000 applicable to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0086] The technical solutions of the present application are described below with reference to the accompanying drawings.

[0087] The technical solutions in the embodiments of the present application are applicable to various communication systems, such as a 5th generation (5G) system or new radio (NR) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, and a universal mobile telecommunication system (UMTS).

[0088] In order to facilitate understanding of the embodiments of the present application, a communication system used in the embodiments of the present application will be described in detail with reference to FIG. 1 and FIG.

[0089] 1 is a schematic diagram of a wireless communication system 100 applicable to an embodiment of the present application. As shown in FIG. 1, the wireless communication system 100 may include at least one access network device, such as an access network device 111 shown in FIG. 1. The wireless communication system 100 may further include at least one terminal equipment, such as a terminal equipment 121 to a terminal equipment 123 shown in FIG. 1. Both the access network device and the terminal equipment may be configured with multiple antennas, and the access network device and the terminal equipment may communicate with each other using a multi-antenna technology.

[0090] 2 is a schematic diagram of a wireless communication system 200 applicable to an embodiment of the present application. As shown in FIG. 2, the wireless communication system 200 includes a terminal device 210, an access network device 220, and a core network device 230. The terminal device 210 is an example, and the communication system 200 may include multiple terminal devices.

[0091] It should be understood that Figures 1 and 2 are merely examples for illustrative purposes and that the present application is not limited thereto.

[0092] It should be further appreciated that the terminal equipment may be a user equipment, an access terminal, a UE unit, a UE station, a mobile station, a remote station, a remote terminal, a mobile device, a UE terminal, a terminal, a wireless communication device, a multimedia device, a streaming media device, a UE proxy, a UE device, etc. The access terminal may 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, another processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal in a future 5G network, a terminal in a future evolved Public land mobile network (PLMN) network, etc.

[0093] An access network device is a device capable of communicating with a terminal device, and may be a base station, a relay station, or an access point. The base station may be a base transceiver station (BTS) in a Global System for Mobile Communication (GSM) or Code division multiple access (CDMA) network, a Node base station (NB) in a Wideband code division multiple access (WCDMA) system, an Evolutional NB (eNB or eNodeB) in a Long Term Evolution (LTE), a radio controller in a Cloud radio access network (CRAN) scenario, a base station device in a future 5G network, or an access network device in a future evolved PLMN network, or a wearable device or an in-vehicle device.

[0094] A Core network (CN) device may be a CN device corresponding to different devices in different systems. For example, in 3G, a core device may correspond to a Serving GPRS support node (SGSN) and / or a Gateway GPRS Support Node (GGSN) of a General Packet Radio Service (GPRS) technology. In 4G, a core device may correspond to a Mobility management entity (MME) and / or a Serving gateway (S-GW). In 5G, a core device may correspond to, for example, an Access and Mobility Management Function (AMF), a Session Management Function (SMF), or a User plane Function (UPF).

[0095] In order to facilitate understanding of the embodiments of the present application, the following first provides a brief description of related art in the present application.

[0096] (1) UE operation state In 4G systems, the radio resource control (RRC) connection state is classified into an RRC connected state and an RRC idle state. When the UE is powered on and has no connection to the wireless network, the UE is in the idle state. When the UE has data to be transmitted / received, the UE needs to establish a connection to the wireless network, that is, the UE needs to enter a connected state to transmit and receive data.

[0097] Compared to 4G networks, 5G inherits the concepts of RRC idle and RRC connected states. In addition, another state, the RRC inactive state, is introduced in 5G. The three RRC states may be transitioned between each other. The three RRC states are described below.

[0098] RRC connected state: The UE establishes an RRC connection, the UE can transmit and receive dedicated data, and discontinuous reception (DRX) may be used based on the UE activity to reduce air interface resources and UE power consumption.

[0099] RRC idle state RRC_IDLE: The UE has no RRC connection, and the UE performs cell selection and reselection, monitors the paging channel, and performs Tracking area update (TAU).

[0100] RRC Inactive State (RRC_INACTIVE): The RRC inactive state is a new state in 5G that allows the UE to quickly return to a connected state.

[0101] 2. Paging The paging function is initiated by the network side. The purpose of sending Paging to the UE by the gNB and the corresponding state of the UE are listed in Table 1.

[0102] [Table 1]

[0103] The content of the paging message is transmitted to the UE by scrambling the physical downlink control channel (PDCCH) using a paging radio network temporary identifier (P-RNTI) to indicate the physical downlink shared channel (PDSCH) resource location. The content of the paging message is transmitted to the UE via the PDSCH resource location, and the PDSCH resource is indicated by the PDCCH scrambled using the P-RNTI. That is, to obtain the paging message, the UE first needs to wake up periodically to monitor the PDCCH channel scrambled using the P-RNTI, and then needs to analyze the downlink control information (DCI) to further obtain the time-frequency location of the PDSCH channel. Finally, the UE analyzes the content of the paging message in the corresponding PDSCH.

[0104] A UE in RRC_IDLE / INACITVE state "wakes up" to receive Paging messages only during predefined periods, and the frequency domain resources occupied by the Paging messages are specified by the PDCCH scrambled with P-RNTI (0xFFFE). During other periods the UE is in sleep state to reduce power consumption and extend UE battery life.

[0105] Paging may be initiated by the core network or by the access network. A short message such as systemInfoModification may be used to specify which fields are carried in the paging. If the paging message carries systemInfoModification, the paging message is used to inform the UE of the system information modification. Table 2 describes the contents represented by different bits in the short message.

[0106] [Table 2]

[0107] 3. Multicast / Multicast Service Configuration Information The configuration information of the multicast / multicast service is configured by the network and sent to the UE. The UE receives the service data of the multicast / multicast service involved through the configuration information. The configuration information of the multicast and multicast service may include, but is not limited to: Service Class: MBS Service / Session ID, Temporary Mobile Group Identifier, corresponding scheduling information and DRX, G-RNTI, and power allocation for physical and logical channels; and Cell level: Protocol stack / radio bearer, where the configuration of the radio bearer may include corresponding configurations of a packet data convergence protocol layer, a radio link control layer, a medium access control layer, and a physical layer.

[0108] Considering NR functionality, the bandwidth of the Bandwidth part (BWP) or MBS service reception is also required. If encryption and / or integrity-based initial protection is applied, the relevant configurations must also be delivered.

[0109] 4. Multicast service reception Currently, the 3GPP standard considers that a base station may transmit multicast services to a UE in Point to Point (PTP) mode and Point to Multi-Point (PTM) mode. The PTM mode is used to transmit multicast services to multiple UEs simultaneously, and the PTP mode is used to transmit data to only one UE. The base station can dynamically use the two modes to transmit data to the same UE. The PDCP layer is shared between the two modes.

[0110] In the prior art, the UE first joins a multicast group, and the UE is released to be in an idle or inactive state before the service starts. When the group needs to transmit data, the CN must trigger a notification to the UE. For example, the CN may use a paging process to notify the UE. When the UE is paged, the UE accesses the network, the CN transmits multicast-related information and the UE associated with the multicast service to the base station serving the UE, and the base station configures an MBS RB for the UE based on the information to receive the multicast service. However, sending a paging message from the CN to the UE via the base station is too inefficient, and a paging message needs to be triggered for each UE in the group. In addition, the CN or the base station cannot determine the appropriate start time to transmit the multicast data. Furthermore, if the CN or the base station starts transmitting multicast data and new UEs access the network during this period, it is unclear how to handle the multicast data that these UEs have missed receiving.

[0111] The triggered paging message for each UE in the group may carry at least one of the following information:

[0112] 1. UE paging identity The UE paging identifier may be the non-access stratum identifier of the UE, for example, 5G-S-TMSI in a 5G communication system. The UE paging identifier has two functions in a 5G communication system. In one aspect, the UE paging identifier needs to be sent to the UE via a UE paging message, so that the UE determines whether the UE has been paged based on the identifier. In another aspect, the access network device needs to calculate a paging occasion based on the identifier. According to 3GPP TS 3804, the calculation of the paging occasion of the UE is related to the result of the non-access stratum identifier mod 1024 (e.g., 5G-S-TMSI mod 1024) of the UE and the DRX cycle used by the UE. The DRX cycle used by the UE is determined based on the Non-Access Stratum (NAS) DRX cycle applied by the UE and the default DRX cycle in the system broadcast. For example, the DRX cycle used by the UE may be determined according to Equation 1 and Equation 2, where Equation 1 represents a method for determining the system frame number of the paging frame, and Equation 2 represents a method for determining the PO index according to the index (i_s). (SFN+PF_offset)mod T=(T div N)×(UE_ID mod N)(Formula 1) i_s=floor(UE_ID / N)mod Ns(Formula 2)

[0113] SFN is the system frame number. PF_offset is the offset used for paging frame (PF) determination. T is the UE DRX cycle (T is determined by the shortest UE specific DRX value, if the DRX value is configured by the RRC layer and / or higher layers, the DRX value is the default DRX value broadcasted in the system information, in RRC idle state (RRC_IDLE), if the UE specified DRX value is not configured by higher layers, the default value applies). N is the total number of paging frames in T. Ns is the number of paging opportunities in PF. UE_ID is the result of 5G-S-TMSI mod 1024.

[0114] 2. UE DRX cycle (optional) The UE DRX cycle is a DRX cycle applied by the UE NAS layer. The UE DRX is an optional function. If the UE NAS layer does not apply a DRX cycle, the paging message does not include the DRX cycle.

[0115] 3. Paging area information (optional) The paging area information may include, for example, a tracking area identity list (TAI list). The paging area information is used by the access network device to send paging only in cells related to the tracking area identity list when the access network device determines paging. For example, an access network device corresponds to 10 cells, and the 10 cells belong to TA 1, TA 2, and TA 3, respectively. If the paging area information carries TA 1, the access network device will send paging messages only in cells that have a corresponding relationship with TA 1.

[0116] 4.UE capability information (optional) Currently, the UE capability information only includes information about the frequency bands supported by the UE, and is used by the access network device to send a paging message when the access network device decides to send the paging message, and the paging message only exists in the frequency bands supported by the UE and only exists in the cells in the TAI list. If the paging message does not carry the UE capability information, the base station will send the paging message to all cells in the TA list.

[0117] 5. Paging priority (optional) The paging priority is used by the base station to determine the priority of sending a paging message, ie, whether to send the paging message with priority when there is a large number of paging messages in the system.

[0118] In view of this, the present application provides a data transmission method, thereby improving the efficiency of paging messages, determining an appropriate time for a CN or a base station to transmit multicast data, and during the process of transmitting multicast data by a CN or a base station, enabling a UE that has accessed a CN or a base station to receive multicast data that it has previously missed, thereby optimizing multicast services.

[0119] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the embodiments provided in the present application will be described in detail with reference to the accompanying drawings.

[0120] 3 is a schematic flow chart of a data transmission method 300 according to an embodiment of the present application. The method 300 may include the following steps.

[0121] In S301, an access network device receives paging indication information sent by a core network device and sends a paging message to a terminal device.

[0122] For example, after receiving the paging indication information sent by the core network device, the access network device may send a paging message to the terminal equipment in the multicast group based on the paging indication information. The paging indication information includes dedicated information and common information of the terminal equipment in the multicast group. The dedicated information includes at least one of paging identifier, discontinuous reception cycle information, and capability information of each terminal equipment. The common information includes at least one of the same paging priority information and tracking area identity list information of each terminal equipment. The access network device obtains a paging opportunity based on the dedicated information and the common information, and sends a paging message to the terminal equipment in the multicast group on the paging opportunity.

[0123] At S302, a core network device determines a transmission time of data of a multicast service.

[0124] For example, one multicast group may include multiple terminal devices, and these terminal devices cannot access the access network device at the same time. Therefore, before transmitting the data of the multicast service to the access network device, the core network device determines the transmission time of the data of the multicast service. In this way, the data of the multicast service can be distributed flexibly.

[0125] At S303, the access network device retransmits to the terminal equipment data packets that belong to the multicast service and have not been received by the terminal equipment.

[0126] For example, when an access network device distributes data of a multicast service and when a terminal equipment is accessing the access network device, the terminal equipment reports an identifier of a data packet of the received multicast service to the access network device, and the access network device distributes data that belongs to the multicast service and has been distributed but not received by the terminal equipment based on the identifier reported by the terminal equipment.

[0127] Step 301 is described in detail below. Figure 4 is a schematic interaction diagram of a data transmission method 400 according to an embodiment of the present application. The method 400 may include the following steps:

[0128] At S401, a core network device generates first information.

[0129] For example, the core network device may generate the first information.

[0130] In one possible embodiment, the first information may include paging indication information, the first information including a service identifier of the multicast service and first parameter information. The first parameter information includes at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal device in the first set of terminal devices, the first set of terminal devices including at least two terminal devices. The first information further includes second parameter information, the second parameter information including at least one of common paging priority information, and common tracking area identity list information of each terminal device in the second set of terminal devices. The second set of terminal devices includes at least two terminal devices, the second set of terminal devices belonging to the first set of terminal devices.

[0131] Specifically, when the multicast group has data to be transmitted, the core network device needs to notify the terminal equipment that has joined the multicast group that the multicast service is about to start, so that the terminal equipment accesses the access network device to obtain the service. The notification may be sent in a paging procedure. In this embodiment of the present application, the core network device generates first information, and the first information includes a service identifier of the multicast service, and first parameter information. The service identifier of the multicast service is used to notify the access network device of the service identifier for triggering paging. The first parameter information includes at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal equipment in the first set of terminal equipment. The first set of terminal equipment includes at least one terminal equipment. In addition, the terminal equipment in the first set of terminal equipment is a terminal equipment that has joined the multicast group but is in an RRC idle state. In addition, the first information may further include second parameter information. The second parameter information includes at least one of common paging priority information and common tracking area identity list information of each terminal equipment in the second terminal equipment set. The second terminal equipment set includes at least one terminal equipment, and the second terminal equipment set belongs to the first terminal equipment set. The second parameter information is information of the common part of all terminal equipment in the second terminal equipment set, that is, the paging priority information or tracking area identity list information of all terminal equipment in the second terminal equipment set is the same. The content of the first information is shown in Table 3 and includes information on the UE paging identifier (5G-S-TMSI), UE DRX cycle, tracking area list (TA list) information, and paging capability information.

[0132] [Table 3]

[0133] In another possible embodiment, the first information may include a service identifier of the multicast service and the first parameter information. The first parameter information may include at least one paging index value, and may not need to carry the UE NAS layer identifier. The paging index value is calculated based on the NAS layer identifier of the terminal equipment. For example, the paging index value may be obtained by 5G-S-TMSI mod 1024.

[0134] In a first possible implementation, it should be understood that if the results of the non-access stratum identifier mod 1024 (i.e. the paging index below) and the used DRX cycle (the value of the DRX cycle being a value smaller than the NAS stratum DRX cycle and the default DRX cycle of the cell) of two terminals in the second set of terminal equipment are the same, the paging occasions calculated by the two terminal equipments will be the same. Therefore, it is not necessary for the core network device to transmit to the access network device the non-access stratum identifiers of all terminal equipments and the optional DRX cycles corresponding to all terminal equipments in order for the access network device to be able to calculate the paging occasions. For all terminal equipments having the same results of the non-access stratum identifier mod 1024 and the same NAS stratum DRX cycle, the core network device needs to inform the access network device of only one record thereof.

[0135] Further, the first parameter information may further include at least one of information regarding a NAS layer DRX cycle corresponding to the paging index value, information regarding a tracking area list (TA list), or paging capability information, so that the access network device can send the first message based on the paging index value.

[0136] Optionally, for terminal devices having the same paging index (5G-S-TMSI mod 1024), if the discontinuous reception cycle (DRX cycle) information (if DRX cycle information exists, DRX cycle information is considered, if DRX cycle information does not exist, DRX cycle information is not considered), tracking area list (TA list) information, and paging capability information (if paging capability information exists, paging capability information is considered, if paging capability information does not exist, paging capability information is not considered) of at least two terminal devices are the same, the first parameter may carry the related parameters of only one terminal device. As shown in Table 4, the paging indexes of terminal device a, terminal device b, and terminal device c are the same. However, the DRX cycle information, tracking area list information, and paging capability information of terminal device a are the same as those of terminal device c. In this case, the first parameter may carry parameter information of only terminal device a or only terminal device c. Similarly, the first parameter may carry parameter information of only terminal device e or only terminal device g.

[0137] [Table 4]

[0138] Optionally, for associated terminal devices with the same paging index and the same DRX cycle, the first parameter may include parameter information of only one group of terminal devices, so that the core network device may send only one record information. The tracking area list (TA list) information may be a combination of the tracking area list (TA list) information of all associated terminal devices. In addition, the paging capability information may alternatively be a set of paging capability information of all associated terminal devices, or may not carry paging capability information. As shown in Table 5, since the paging index information and DRX cycle information of the terminal device a are the same as the terminal device d, the tracking area list information and paging capabilities of the terminal device a and the terminal device d may be integrated, thereby obtaining a first parameter including paging index information x, DRX cycle information DRX 1 (320), tracking area list information TA 1, TA 2, and TA 3, and paging capability information Band1, Band2, and Band3. In addition, the paging index information and DRX cycle information of the terminal device b are the same as the terminal device c. In this case, the tracking area list information and paging capabilities of terminal device b and terminal device c may be integrated to obtain a first parameter including paging index information x, tracking area list information TA1, TA2, and TA3.

[0139] [Table 5]

[0140] The result obtained by the combination is shown in Table 6. Based on the result of the combination, the core network device needs to send only two records to the access network device. For example, the core network device may send information corresponding to other columns than the first column of Table 6 to the access network device.

[0141] [Table 6]

[0142] It should be understood that if the tracking area lists (TA lists) corresponding to all paging indexes have the same TAI, the same TAI may be transmitted as a common tracking area identity list (TAI list), and the common tracking area identity list is independent of the paging index set. Therefore, the tracking area identity list actually corresponding to each paging index may be a combination of the common tracking area identity list and the tracking area identity list corresponding to each paging index individually.

[0143] It should be further understood that there may be only one paging priority for the entire paging message, and the paging priority does not need to be set for each terminal device or each paging index.

[0144] In addition, optionally, in the two embodiments described above, if the core network device expects the access network device to transmit paging information carrying a service identifier of the multicast service at all configured paging times, the core network device may not carry information such as paging identity or paging index information of the terminal equipment and DRX cycle information used for calculating paging occasions. For example, if the first information only carries tracking area list information and does not carry paging identity or paging index information of the terminal equipment, the access network device may transmit a paging message at all configured paging times in all cells related to the tracking area list.

[0145] At S402, the core network device sends first information to the access network device.

[0146] For example, after generating the first information, the core network device may transmit the first information to the access network device.

[0147] At S403, the access network device determines a transmission time of the second information.

[0148] For example, after receiving the first information, the access network device may determine a time to deliver second information, where the second information includes service identifier information of the multicast service.

[0149] In one possible embodiment, after receiving the first information, the access network device can calculate all paging occasions based on the paging identifiers of each terminal equipment included in the first parameter information and the discontinuous reception cycle information corresponding to the paging identifiers. A paging occasion is a time when the access network device transmits the second information to the terminal equipment in the multicast group. The access network device may transmit the second information carrying the service identifier on the paging occasions corresponding to each terminal. In addition, the access network device may centrally transmit the second information to the terminal equipment in the second terminal equipment set based on the common information, that is, the access network device needs to transmit the second information to the terminal equipment in the second terminal equipment set only once.

[0150] In another possible embodiment, after receiving the first information, the access network device may calculate a paging occasion corresponding to each paging index (see Equation 1 and Equation 2 above), i.e., a time when the second information is delivered, based on the paging index information included in the first parameter information and the DRX cycle information that may be carried in the first parameter information. The access network device transmits the second information carrying a service identifier on such a paging occasion. Optionally, the area information for transmitting the second information may be determined based on the TA list information corresponding to the paging index, and the frequency band information for transmitting the second information may be determined based on the paging capability information corresponding to the paging index. If the paging capability information does not exist, the access network device may transmit the second information to all cells included in the TA list. If the first information includes a common tracking area identity list corresponding to the paging index, for each paging index, the access network device may determine that the tracking area for transmitting the paging by the paging index is the union of the common tracking area list and the tracking area list corresponding to the paging index.

[0151] Optionally, in the two embodiments described above, if the core network device does not carry information used for calculating the paging occasion, for example, if the core network device does not carry paging identity information or paging index information or terminal equipment DRX cycle information, and the first information can only carry tracking area list information and does not carry terminal equipment paging identity information or paging index information, the access network device may send a paging message on all configured paging occasions in all cells related to the tracking area list. All configured paging occasions in cells refer to paging occasions configured in a cell system broadcast and used for paging.

[0152] At S404, the access network device transmits second information to the first terminal equipment.

[0153] For example, the access network device may transmit the second information to the first terminal equipment, where the first terminal equipment belongs to the first set of terminal equipment. Alternatively, the access network device may transmit the second information to the first terminal equipment on a paging occasion determined based on the paging occasion determined by the first information. Furthermore, when the first information includes the second parameter, the access network device may transmit the second information to the terminal equipment in the second set of terminal equipment in a centralized manner, that is, the access network device needs to transmit the second information to the terminal equipment in the second set of terminal equipment only once.

[0154] Specifically, after receiving the first information, the access network device may send second information, i.e., send a paging message, to the first terminal equipment at the paging occasion. When the first information includes a second parameter, the access network device may send a piece of second information to the terminal equipment in the set of the second terminal equipment based on the second parameter in the first information. After receiving the message, the terminal equipment checks the service identifier of the multicast service. If the terminal equipment participates in the multicast service, the terminal equipment initiates a connection establishment process to access the access network device. Furthermore, the terminal equipment may initiate a request information of the multicast service to the core network device, and the core network device may determine that the terminal equipment has accessed the network based on the request information.

[0155] Based on the above-mentioned solution, the access network device can determine a paging occasion based on the first information, and send the second information to all terminal equipments monitoring the paging time, where the second information carries a service identifier. This overcomes the problem that the efficiency is excessively low due to the need for the access network device to send the paging indication information to each terminal equipment in the multicast group individually, reduces the number of paging indication information sent by the core network to the access network device, and reduces the signaling transmission. Therefore, the transmission efficiency of the paging indication information is greatly improved.

[0156] Step 303 is described in detail below. Figure 5 is a schematic interaction diagram of a data transmission method 500 according to an embodiment of the present application. The method 500 may include the following steps:

[0157] In S501, a terminal device sends first indication information to an access network device.

[0158] For example, the terminal equipment may send first indication information to the access network device, the first indication information indicating an identifier of a data packet that is of a multicast service and that has been received by the terminal equipment, thereby informing the access network device of the identifier of the data packet that is of the multicast service and that has been received by the terminal equipment.

[0159] Specifically, after receiving the target configuration information, the terminal device initializes a receiving window to facilitate receiving the multicast service. In other words, the terminal device receives the PDCP data packets of the multicast service in PTM mode based on the PTM mode configuration information, determines the receiving status of the PDCP data packets received in PTM mode, and sends the first indication information, i.e., sends the identifiers of the data packets of the multicast service and received in PTM mode to the access network device. Specifically, the terminal device may send the first indication information using a PDCP status report, or may report the first indication information to the access network device using RRC signaling. The mode of sending the first indication information by the terminal device is not limited in the present application.

[0160] For example, after receiving the target configuration information, the terminal device receives data packets of a multicast service in PTM mode based on the G-RNTI, performs data processing, and then sends an identifier of the data packet to the access network device. The identifier of the data packet of the multicast service received at the terminal device may be a sequence number of the data packet of the multicast service received at the terminal device in PTM mode, and may further be a sequence number of the first data packet of the multicast service received at the terminal device in PTM mode.

[0161] It should be understood that the terminal equipment can transmit to the access network device the sequence number of the first data packet of the multicast service received in PTM mode at the terminal equipment, the sequence number of the received data packet with the smallest sequence number, or the sequence numbers of all received data packets, which is not limited in this application.

[0162] Optionally, before receiving the first indication information, the access network device may send second request information to the terminal equipment, where the second request information is used to request the terminal equipment to report the first indication information.

[0163] In one possible embodiment, before the access network device receives the first indication information of the terminal equipment, the access network device may receive second indication information sent by the core network device, where the second indication information indicates that the terminal equipment needs to receive data packets of the multicast service. This helps the access network device to determine that the terminal equipment needs to receive data packets of the multicast service. The second indication information may be carried in signaling related to the terminal, for example, a PDU session establishment message for the terminal, an initial context setup message, and an initial context modification message. Specifically, the second indication information may indicate a QoS flow corresponding to the multicast service that needs to be received by the terminal. Alternatively, the second indication information may be carried in a multicast service establishment message. For example, the indication information is a multicast service establishment message carrying a UE identifier, where the UE identifier indicates that the UE needs to receive the multicast service.

[0164] Optionally, before receiving the second instruction information, the access network device may send first request information to the core network device, where the first request information is used to request the core network device to deliver the second instruction information.

[0165] In another possible embodiment, the core network device may transmit to the access network device information about the cell and third indication information, the third indication information indicating that the terminal in the first state and in the cell receives the multicast service. For example, the third indication information indicates whether the terminal in the first state receives the multicast service in the cell, indicates the number of terminals in the first state receiving the multicast service in the cell, or indicates terminal identities of terminals in the first state receiving the multicast service in the cell. The first state may be an RRC idle state, an RRC inactive state, or a combination of an RRC idle state and an RRC inactive state. The third indication information may also be carried in a multicast service establishment message or in a signaling related to the terminal equipment, such as a protocol data unit session establishment message for the terminal equipment, an initial context setup message, and an initial context modification message. The second indication information and the third indication information may be carried in the same message or in different messages. Alternatively, the second indication information and the third indication information may be transmitted independently. For example, only the second instruction information is sent and the third instruction information is not sent, or only the third instruction information is sent and the second instruction information is not sent. The present application is not limited thereto.

[0166] Optionally, because the access network device needs to determine whether the terminal equipment needs to receive data packets of the multicast service, the access network device needs to send first request information to request the core network device to deliver second indication information, where the second indication information indicates that the terminal equipment needs to receive data packets of the multicast service.

[0167] Further, after receiving the second indication information, the access network device may determine target configuration information.

[0168] For example, the access network device determines that the terminal equipment needs to receive data packets of a multicast service, and configures target configuration information for the terminal equipment, where the target configuration information is configuration information of the multicast service of the terminal equipment, and the configuration information further includes PTM mode configuration information and PTP mode configuration information, where the PTM mode uses G-RNTI to receive the multicast data, and the PTP mode uses C-RNTI to receive the multicast data.

[0169] In one possible embodiment, after being informed by the core network device that the terminal equipment needs to receive data packets of the multicast service, the access network device configures, for the terminal equipment, configuration information of a Multimedia broadcast multicast service radio bearer (MRB) MRB for receiving data of the multicast service. Furthermore, the MRB configuration information includes PTM mode configuration information and PTP mode configuration information. The PTM configuration information may include G-RNTI configuration information, RLC configuration information and other configuration information. The PTP mode configuration information may include RLC configuration information and other configuration information. Optionally, the access network device further configures control information of a PDCP reception window of the MRB of the terminal equipment, so that the terminal equipment can set an initial position of the PDCP reception window of the MRB based on the control information.

[0170] In another possible embodiment, the access network device determines based on the third indication information that there is a terminal device in the second state that receives the multicast service, and the access network device determines that the target configuration information includes PTM configuration information, so that the access network device transmits the multicast service to the terminal devices in the second state in the cell based on the PTM configuration. Since the terminal devices in the second state do not have an uplink feedback channel, the access network device cannot know the channel state of these terminal devices and can only perform PTM scheduling based on the cell edge coverage. Alternatively, if it is determined based on the third indication information that none of the terminal devices in the second state receives the multicast service, the access network device may perform PTM or PTP scheduling based on the terminal devices that are not in the first state (terminal devices in the RRC connected state). The third indication information may be used to avoid scheduling problems caused by a situation in which the access network device does not know whether there is a terminal device in the second state in the cell. For example, if there are no terminal devices in the second state in the cell, but the access network device does not know that there are no terminal devices, then according to a conservative policy, only terminal devices at the edge of the cell can be scheduled, resulting in low scheduling efficiency.

[0171] Further, after determining the target configuration information of the terminal equipment, the access network device transmits the target configuration information to the terminal equipment.

[0172] In one possible embodiment, the initial sequence number of the PDCP receiving window of the unicast service starts from 0. However, in the case of a multicast service, it is not always appropriate that the initial sequence number of the PDCP receiving window of the multicast service starts from 0, since the multicast service may already be in transmission when the terminal equipment accesses the multicast service. In this case, if the access network device configures a control parameter of the receiving window for the terminal equipment, the terminal equipment may adjust the position of the receiving window by changing the control parameter. For example, if the access network device informs the terminal equipment that the initial sequence number of the receiving window of the multicast service is 100, the terminal equipment may directly set the initial sequence number of the receiving window of the multicast service to 100, and the access network device may change the initial position of the receiving window using data packets that are of the multicast service and are buffered by the MRB. For example, during data packet transmission, the sequence number of the data packet transmitted by the access network device using the multicast service is 150, but data packets with sequence numbers between 130 and 150 are still stored in the buffer. In this case, the terminal equipment may be informed to change the initial position of the receiving window to 130. In this way, the access network device can transmit data packets with sequence numbers 130 to 150 to the terminal equipment in PTP mode. This situation may also occur in the handover process. For example, when the UE is handed over from another base station to the current base station, the data transmitted before the UE receives the first data packet from the current base station in PTM mode and after the UE receives the last data packet from another station need to be transmitted to the UE in PTP mode.

[0173] In another possible embodiment, if the access network device determines based on the third indication information that the terminal equipment in the second state receives the multicast service, the step of the access network device transmitting the target configuration information to the terminal equipment after the access network device determines the target configuration information of the terminal equipment includes a step of transmitting the target configuration information to the terminal equipment in the second state via a broadcast channel or a multicast control channel (MCCH), where the terminal equipment in the second state can only receive the service in the PTM manner and cannot perform auxiliary transmission in the PTP mode, or a step of transmitting the target configuration information to the terminal equipment via dedicated signaling before the terminal equipment in the second state enters the second state. It should be understood that since the terminal equipment in the second state can only receive the service in the PTM manner and cannot perform auxiliary transmission in the PTP mode, the terminal equipment in this state cannot perform the subsequent step of retransmitting the data packet to the terminal equipment.

[0174] At S502, the access network device determines a target data packet.

[0175] For example, after receiving the first indication information, the access network device determines a target data packet based on the first indication information.

[0176] Specifically, after receiving sequence numbers of data packets of a multicast service and received in PTM mode by a terminal equipment, the access network device determines, based on the sequence numbers, data packets that need to be transmitted to the terminal equipment in PTP mode, i.e., target data packets.

[0177] At S503, the access network device transmits a targeted data packet to the terminal equipment.

[0178] For example, after determining the target data packet, the access network device transmits the target data packet to the terminal equipment.

[0179] For example, if the terminal equipment indicates through the first indication information that the first data packet belongs to a multicast service and that the sequence number of the first data packet received by the terminal equipment in PTM mode is 15, the access network device uses the data packets with sequence numbers 1 to 14 as target data packets and transmits the target data packets to the terminal equipment in PTP mode.

[0180] It should be understood that in this embodiment of the present application, the terminal equipment can access the access network during the period when the access network device transmits the data packets of the multicast service and receive the data packets of the multicast service. Alternatively, the terminal equipment may receive the data packets of the multicast service while accessing the access network device, which is performed during the process when the access network device transmits the data packets of the multicast service. This is not limited in the present application.

[0181] Based on the aforementioned solution, the terminal equipment feeds back identifiers of data packets belonging to a multicast service and received in PTM mode to the access network device, and the access network device can determine the data packets sent in PTM mode but not received by the terminal equipment, i.e., target data packets, based on the identifier information reported by the terminal equipment, and send the target data packets in PTP mode to the terminal equipment. In this way, the terminal equipment can receive the missed data packets belonging to a multicast service and sent by the access network device, because the terminal equipment accesses the access network device in the process of sending the data packets of the multicast service, or the terminal equipment starts receiving the data packets when the access network device sends the data packets of the multicast service.

[0182] 6A and 6B are schematic interaction diagrams of a data transmission method 600 according to an embodiment of the present application. The method 600 may include the following steps.

[0183] In S601, a first terminal device and a second terminal device join a multicast service.

[0184] For example, the first terminal device and the second terminal device can obtain a service identifier of the multicast service or a multicast address of the multicast service in advance, and send non-access stratum signaling to a core network device to request joining a multicast group, or use the joining process of the Internet Group Management Protocol to join the multicast service based on the multicast address of the multicast service.

[0185] At S602, a core network device generates first information.

[0186] For example, the core network device can generate first information, and the first information may include paging indication information, and the first information includes a service identifier of a multicast service, and first parameter information, and the first parameter information includes at least one of paging identification information, discontinuous reception cycle information, and capability information of each terminal device in the first set of terminal devices, and the first set of terminal devices includes at least two terminal devices. In addition, the first information may further include second parameter information, and the second parameter information includes at least one of common paging priority information, and common tracking area identity list information of each terminal device in the second set of terminal devices, and the second set of terminal devices includes at least two terminal devices, and the second set of terminal devices belongs to the first set of terminal devices. For a specific description of the first information, please refer to the description of the first information in S401. For the sake of brevity, details will not be described again here in this application.

[0187] At S603, the core network device sends first information to the access network device.

[0188] For example, after generating the first information, the core network device may transmit the first information to the access network device.

[0189] At S604, the access network device determines a transmission time of the second information.

[0190] For example, after receiving the first information, the access network device may determine the transmission time of the second information. For a specific description of the step of determining the transmission time of the second information by the access network device, please refer to the description of the step of determining the transmission time of the first information in step S403. For the sake of brevity, the details will not be described again here in this application.

[0191] At S605, the access network device transmits second information to the first terminal equipment and the second terminal equipment.

[0192] For example, the access network device may transmit the second information to the first terminal equipment and the second terminal equipment.

[0193] Specifically, after receiving the first information, the access network device transmits the first information, i.e., transmits a paging message, to the first terminal equipment and the second terminal equipment in the multicast group at the paging occasion. The access network device may centrally transmit the second information to the terminal equipment in the second set of terminal equipment according to the second parameter in the first information, i.e., the access network device needs to transmit the second information to the terminal equipment in the second set of terminal equipment only once.

[0194] At S606, the first terminal device establishes a network connection to the access network device.

[0195] For example, after receiving the first information, the first terminal equipment may check the service identifier of the multicast service. If the first terminal equipment participates in the multicast service, the first terminal equipment may initiate a connection establishment process to access the access network device. Furthermore, the first terminal equipment may initiate a request information of the multicast service to the core network device, and the core network device may determine that the first terminal equipment has accessed the network based on the request information.

[0196] At S607, the core network device sends the third information to the access network device.

[0197] For example, the core network device may send third information to the access network device, where the third information includes parameter information of the multicast service.

[0198] Specifically, after confirming that the first terminal equipment is accessing the network, the core network device configures transmission parameters of the multicast service for the access network device and sends the parameter information of the multicast service to the access network device. For example, the access network device may send a quality of service information parameter of the multicast service to be transmitted to the access network device, and notify the access network device that the first terminal equipment needs to receive the data of the multicast service. In addition, the access network device may configure an MRB for receiving the multicast service for the first terminal equipment based on the parameter information of the multicast service, and after receiving the multicast service data distributed by the core network device, the access network device may send the multicast service data to the first terminal equipment through the MRB.

[0199] At S608, the core network device determines a transmission time of the fourth information.

[0200] For example, the core network device may determine a transmission time of the fourth information, where the fourth information includes data of a multicast service, i.e., the core network device may determine a transmission time of the data of the multicast service to be transmitted to the access network device.

[0201] In one possible embodiment, the core network device may determine the transmission time of the fourth information based on the delay requirement of the multicast service of the terminal equipment in the multicast group. For services with high delay requirements, the access network device may wait until the transmission time of the fourth information is earlier than the delay requirement before transmitting data of the multicast service to the access network device, thereby reserving time for the access network device to deliver data to the terminal equipment. For services with low delay requirements, the access network device may start transmission when the access ratio of the terminal equipment accessing the access network device reaches a preset threshold.

[0202] In another possible embodiment, the core network device may determine the transmission time of the fourth information based on the reliability requirements of the multicast service of the terminal equipment in the multicast group. For a service that does not require packet loss, the access network device may transmit the fourth information after all the terminal equipment in the multicast group have accessed the access network device.

[0203] In another possible embodiment, the access network device may determine the transmission time of the fourth information based on the discontinuous reception cycle information of the terminal equipment in the multicast group. Generally, the terminal equipment accesses the access network device after receiving the paging indication message only once in the discontinuous reception cycle, and the core network device transmits the fourth information after the discontinuous reception cycle ends. In this case, the terminal equipment that receives the paging indication message has basically already accessed the access network device.

[0204] In another possible embodiment, the core network device may determine the transmission time of the fourth information based on the ratio of the number of terminal equipments in the multicast group that are accessing the access network device to the number of terminal equipments in the multicast group. The core network device may transmit the fourth information after a certain ratio of the terminal equipments access the access network device. For example, if 95% of the terminal equipments in the multicast group access the access network device, the core network may transmit the fourth information to the access network device. The ratio may be a preset fixed ratio, or may be a ratio configured based on an operation management and maintenance platform. This is not limited in the present application.

[0205] It should be understood that the core network device may alternatively transmit the fourth information to the access network device, and the access network device may determine a transmission time for delivering the fourth information. For example, the access network device may deliver the fourth information based on a requirement of the multicast service of the terminal equipment.

[0206] At S609, the core network device sends the fourth information to the access network device.

[0207] For example, after determining the transmission time of the fourth information, the core network device may transmit the fourth information to the access network device.

[0208] At S610, the access network device transmits the fourth information to the first terminal equipment.

[0209] For example, after receiving the fourth information sent by the core network device, the access network device sends the fourth information to the first terminal equipment.

[0210] At S611, a second terminal device establishes a network connection to an access network device.

[0211] For example, the second terminal device may initiate an establishment process to access the access network device, and may also initiate request information for a multicast service to the core network device, and the core network device may determine that the second terminal device has accessed the network based on the request information.

[0212] At S612, the access network device sends the fifth information to the core network device.

[0213] Optionally, since the access network device needs to determine whether the second terminal equipment needs to receive the data packets of the multicast service, the access network device needs to send fifth information to request the core network device to deliver sixth information, thereby indicating that the second terminal equipment needs to receive the data packets of the multicast service.

[0214] Specifically, the access network device may send fifth information to the core network device, where the fifth information is used to request the core network device to deliver sixth information, where the sixth information indicates that the second terminal equipment needs to receive data packets of the multicast service, and helps the access network device to determine that the second terminal equipment needs to receive data packets of the multicast service.

[0215] At S613, the core network device sends sixth information to the access network device.

[0216] For example, the core network device may transmit the sixth information to the access network device.

[0217] Optionally, the core network device may send sixth information to the access network device based on the fifth information.

[0218] At S614, the access network device determines target configuration information.

[0219] For example, the access network device determines that a second terminal device needs to receive data packets of a multicast service, and configures target configuration information for the second terminal device, where the target configuration information is configuration information of the multicast service of the second terminal device, and the configuration information further includes PTM mode configuration information and PTP mode configuration information. For a specific description of the target configuration information, please refer to the description of the target configuration information in step 501. For the sake of brevity, the details will not be described again here in this application.

[0220] At S615, the access network device transmits the target configuration information to the second terminal equipment.

[0221] For example, after determining the target configuration information of the second terminal device, the access network device may send the target configuration information to the second terminal device. For a specific description of the sending of the target configuration information, please refer to the description of the sending of the target configuration information in step 501. For the sake of brevity, the details will not be described again here in this application.

[0222] At S616, the access network device transmits the seventh information to the second terminal equipment.

[0223] Optionally, the access network device may send seventh information to the second terminal equipment, and the seventh information is used to request the second terminal equipment to report eighth information. The eighth information indicates an identifier of a data packet of the multicast service received by the second terminal equipment, thereby notifying the access network device of an identifier of a data packet of the multicast service received by the second terminal equipment. For a specific description of the eighth information, please refer to the description of the first indication information in step 501. For the sake of brevity, the details will not be described again here in this application.

[0224] At S617, the second terminal equipment transmits eighth information to the access network device.

[0225] For example, the second terminal equipment may transmit eighth information to the access network device, thereby informing the access network device of an identifier of a data packet that is of the multicast service and that has been received by the second terminal equipment.

[0226] Optionally, the second terminal equipment may transmit eighth information to the access network device based on the seventh information.

[0227] At S618, the access network device determines a target data packet.

[0228] For example, the access network device receives the seventh information and determines the target data packet based on the seventh information.

[0229] Specifically, after receiving an identifier of a data packet belonging to a multicast service and received in PTM mode at a second terminal equipment, the access network device may determine, based on the identifier, a data packet that needs to be transmitted in PTP mode to the second terminal equipment, i.e. a target data packet.

[0230] At S619, the access network device transmits the target data packet to the second terminal equipment.

[0231] For example, after determining the target data packet, the access network device may transmit the target data packet to a second terminal equipment.

[0232] For a specific description of the sending of the target data packet, please refer to the description of the sending of the target data packet in step 503. For the sake of brevity, the details will not be described again here in this application.

[0233] Based on the above-mentioned solution, the access network device can send the same paging message to the terminal equipment in the set of the second terminal equipment containing the common information based on the common information in the first information, thereby avoiding sending different paging messages to different terminal equipment. This greatly improves the paging message transmission efficiency. In addition, the core network device determines the transmission time of the third information, so that the core network device can transmit the data of the multicast service to the access network device at a more appropriate time. This improves the flexibility of the transmission of the data of the multicast service by the core network device or the access network device. In addition, the second terminal device feeds back the identifiers of the data packets of the multicast service and received in PTM mode to the access network device, so that the access network device can determine the data packets that have been transmitted but not received by the second terminal equipment based on the identifiers, and retransmit such data packets in PTP mode to the second terminal equipment. Thus, the second terminal equipment can receive the data packets of the multicast service that it has missed. Thus, the effect of multicast service optimization is achieved.

[0234] The embodiments described in this specification may be independent solutions or may be combined based on internal logic, all of which are within the protection scope of this application.

[0235] In the method embodiments described above, it will be understood that the methods and operations performed by the terminal equipment may alternatively be performed by components (e.g., chips or circuits) used in the terminal equipment, and the methods and operations performed by the network device may alternatively be performed by components (e.g., chips or circuits) used in the network device.

[0236] Above, the method provided in the embodiment of the present application has been described in detail with reference to Figures 3 to 6A and 6B. Hereinafter, the communication device provided in the embodiment of the present application will be described in detail with reference to Figures 7 to 10. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment. Therefore, for contents that are not described in detail, please refer to the above-mentioned method embodiment. For the sake of brevity, the details will not be described again here.

[0237] The above mainly describes the solutions provided in the embodiments of the present application from the perspective of the interactions between network elements. It will be understood that, to implement the functions described above, each network element, such as a transmitting device or a receiving device, includes a corresponding hardware structure and / or software module for performing each function. Those skilled in the art may recognize that each unit and algorithm step in the present application can be realized by hardware, or a combination of computer software and hardware, with reference to the examples described in the embodiments disclosed herein. Whether the function is performed by hardware or by hardware driven by computer software depends on the specific application and design constraints of the technical solution. Those skilled in the art may implement the described functions using various methods for each specific application, but it should not be considered that such implementation goes beyond the scope of the present application.

[0238] In the embodiment of the present application, the division into functional modules may be performed in the transmitting device and the receiving device based on the above-mentioned method example. For example, each functional module may be obtained through a division corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module may be implemented in the form of hardware or in the form of a software functional module. It should be noted that in the embodiment of the present application, the module division is an example and is merely a logical division of functions. In the actual implementation, another division method may be used. In the following, an example in which each functional module is obtained by division based on each corresponding function is used for explanation.

[0239] 7 is a schematic block diagram of a communication device according to an embodiment of the present application. The communication device 700 includes a transceiver unit 710 and a processing unit 720. The transceiver unit 710 can implement corresponding communication functions, and the processing unit 720 is configured to perform data processing. The transceiver unit 710 may be referred to as a communication interface or a communication unit.

[0240] Optionally, the communication device 700 may further include a storage unit. The storage unit may be configured to store instructions and / or data. The processing unit 720 may read the instructions and / or data in the storage unit so that the communication device can perform the method embodiments described above.

[0241] The communication device 700 may be configured to perform the operations performed by the terminal device in the above-mentioned method embodiments, in which case the communication device 700 may be a terminal device or a component that may be configured within the terminal device, the transceiver unit 710 being configured to perform the reception / transmission related operations at the terminal device side in the above-mentioned method embodiments, and the processing unit 720 being configured to perform the processing related operations at the terminal device side in the above-mentioned method embodiments.

[0242] Alternatively, the communication device 700 may be configured to perform the operations performed by the network device in the above-mentioned method embodiments, in which case the communication device 700 may be a network device or a component that may be configured within a network device, with the transceiver unit 710 configured to perform the receive / transmit related operations at the network device side in the above-mentioned method embodiments, and the processing unit 720 configured to perform the processing related operations at the network device side in the above-mentioned method embodiments.

[0243] In one design, communications apparatus 700 is configured to perform operations performed by the first terminal device in the embodiment shown in FIG. 4, with transceiver unit 710 configured to perform S404.

[0244] In one example, the communications device 700 is configured to perform the operations performed by the terminal equipment in the embodiment shown in FIG. 5, and the transceiver unit 710 is configured to perform S501 and S503.

[0245] In yet another example, the communications device 700 is configured to perform the operations performed by the first terminal equipment in the embodiment shown in Figures 6A and 6B, and the transceiver unit 710 is configured to perform S601, S605, S606, and S610.

[0246] In yet another example, the communications device 700 is configured to perform the operations performed by a second terminal device in the embodiment shown in Figures 6A and 6B, and the transceiver unit 710 is configured to perform S601, S605, S611, S615, S617, and S619.

[0247] The communication device 700 may perform steps or procedures performed by the terminal equipment in the method 400, the method 500, and the method 600 based on the embodiments of the present application. The communication device 700 may include units configured to perform the methods performed by the terminal equipment in the method 400 of Figure 4, the method 500 of Figure 5, and the method 600 of Figures 6A and 6B. In addition, the units in the communication device 700 and other operations and / or functions described above may be used separately to perform the corresponding procedures of the method 400 of Figure 4, the method 500 of Figure 5, and the method 600 of Figures 6A and 6B.

[0248] When the communications device 700 is configured to perform the method 400 of FIG. 4, the transceiver unit 710 may be configured to perform step 404 of the method 400 .

[0249] When the communications device 700 is configured to perform the method 500 of FIG. 5, the transceiver unit 710 may be configured to perform steps 501 and 503 of the method 500 .

[0250] When the communication device 700 is used as a first terminal device and configured to perform the method 600 of FIGS. 6A and 6B, the transceiver unit 710 may be configured to perform steps 601, 605, 606, and 610 of the method 600.

[0251] When the communications device 700 is used as a second terminal device and configured to perform the method 600 of Figures 6A and 6B, the transceiver unit 710 may be configured to perform steps 601, 605, 611, 615, 617, and 619 of the method 600.

[0252] It should be understood that the specific processes of the units performing the aforementioned corresponding steps have been described in detail in the aforementioned method embodiments, and will not be described in detail here for the sake of brevity.

[0253] In another design, the communications apparatus 700 is configured to perform the operations performed by the access network device in the embodiment shown in FIG. 4, wherein the transceiver unit 710 is configured to perform S402 and S404, and the processing unit 720 is configured to perform S403.

[0254] In one example, the communications apparatus 700 is configured to perform the operations performed by the core network device in the embodiment shown in FIG. 4, where the transceiver unit 710 is configured to perform S402 and the processing unit 720 is configured to perform S401.

[0255] In yet another example, the communications apparatus 700 is configured to perform the operations performed by the access network device in the embodiment shown in FIG. 5, the transceiver unit 710 is configured to perform S501 and S503, and the processing unit 720 is configured to perform S502.

[0256] In yet another example, the communications apparatus 700 is configured to perform the operations performed by the access network device in the embodiment shown in Figures 6A and 6B, and the transceiver unit 710 is configured to perform S601, S603, S605-S607, S609-S613, S615-S617, and S619, and the processing unit 720 is configured to perform S604, S614, and S618.

[0257] In yet another example, the communications apparatus 700 is configured to perform the operations performed by the core network device in the embodiment shown in Figures 6A and 6B, the transceiver unit 710 is configured to perform S601, S603, S607, S609, S612, and S613, and the processing unit 720 is configured to perform S602 and S608.

[0258] The communication device 700 may perform steps or procedures performed by the access network devices and the core network devices in the method 400, the method 500, and the method 600 according to the embodiments of the present application. The communication device 700 may include units configured to perform the methods performed by the access network devices and the core network devices in the method 400 of FIG. 4, the method 500 of FIG. 5, and the method 600 of FIG. 6A and FIG. 6B. In addition, the units in the communication device 700 and other operations and / or functions described above may be used separately to perform the corresponding procedures of the method 400 of FIG. 4, the method 500 of FIG. 5, and the method 600 of FIG. 6A and FIG. 6B.

[0259] When the communications apparatus 700 is used as an access network device and configured to perform the method 400 of FIG. 4, the transceiver unit 710 may be configured to perform steps 402 and 404 of the method 400, and the processing unit 720 may be configured to perform step 403 of the method 400.

[0260] When the communications apparatus 700 is used as a core network device and configured to perform the method 400 of FIG. 4, the transceiver unit 710 may be configured to perform step 402 of the method 400, and the processing unit 720 may be configured to perform step 401 of the method 400.

[0261] When the communications apparatus 700 is used as an access network device and configured to perform the method 500 of FIG. 5, the transceiver unit 710 may be configured to perform steps 501 and 503 of the method 500, and the processing unit 720 may be configured to perform step 502 of the method 500.

[0262] When the communications apparatus 700 is used as an access network device and configured to perform the method 600 of Figures 6A and 6B, the transceiver unit 710 may be configured to perform steps 601, 603, 605-607, 609-613, 614, 615-617, and 619 of the method 600, and the processing unit 720 may be configured to perform steps 604, 614, and 618 of the method 600.

[0263] When the communications apparatus 700 is used as a core network device and configured to perform the method 600 of Figures 6A and 6B, the transceiver unit 710 may be configured to perform steps 601, 603, 607, 609, 612, and 613 of the method 600, and the processing unit 720 may be configured to perform steps 602 and 608 of the method 600.

[0264] The processing unit 720 in the above-mentioned embodiments may be implemented by at least one processor or processor-related circuitry. The transceiver unit 710 may be implemented by a transceiver or a transceiver-related circuitry. The transceiver unit 710 may also be referred to as a communication unit or a communication interface. The storage unit may be implemented by at least one memory.

[0265] As shown in Fig. 8, an embodiment of the present application further provides a communication device 800. The communication device 800 includes a processor 810. The processor 810 is coupled to a memory 820. The memory 820 is configured to store a computer program or instructions and / or data. The processor 810 is configured to execute the computer program or instructions and / or data stored in the memory 820 such that the method in the above-mentioned method embodiment is performed.

[0266] Optionally, the communications device 800 includes one or more processors 810 .

[0267] Optionally, as shown in FIG. 8, the communications device 800 may further include a memory 820 .

[0268] Optionally, the communications device 800 may include one or more memories 820 .

[0269] Optionally, memory 820 may be integrated with processor 810 or located separately.

[0270] 8, the communication device 800 may further include a transceiver 830, which is configured to receive and / or transmit signals. For example, the processor 810 is configured to control the transceiver 830 to receive and / or transmit signals.

[0271] In the solution, the communication device 800 is configured to perform the operations performed by the terminal equipment in the method embodiments described above.

[0272] For example, the processor 810 is configured to perform processing-related operations performed by the terminal equipment in the above-mentioned method embodiments, and the transceiver 830 is configured to perform reception / transmission-related operations performed by the terminal equipment in the above-mentioned method embodiments.

[0273] In another solution, the communications device 800 is configured to perform the operations performed by a core network device or an access network device in the method embodiments described above.

[0274] For example, the processor 810 is configured to perform processing-related operations performed by a core network device or an access network device in the method embodiments described above, and the transceiver 830 is configured to perform transceiver-related operations performed by a core network device or an access network device in the method embodiments described above.

[0275] An embodiment of the present application further provides a communication device 900. The communication device 900 may be a terminal device or a chip. The communication device 900 may be configured to perform the operations performed by the terminal device in the above-mentioned method embodiments.

[0276] When the communication device 900 is a terminal device, FIG. 9 is a simplified schematic diagram of the structure of the terminal device. As shown in FIG. 9, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input / output device. The processor is mainly configured to process communication protocols and communication data, control the terminal device, execute software programs, process data of the software programs, and the like. The memory is mainly configured to store software programs and data. The radio frequency circuit is mainly configured to perform conversion between baseband signals and radio frequency signals, and process radio frequency signals. The antenna is mainly configured to receive and transmit radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, a display, or a keyboard, is mainly configured to receive data input by a user and output data to the user. Note that some types of terminal devices may not have input / output devices.

[0277] When data needs to be transmitted, after performing baseband processing on the data to be transmitted, the processor outputs the baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal, and then transmits the radio frequency signal to the outside in the form of electromagnetic waves through an antenna. When data needs to be transmitted to a terminal device, the radio frequency circuit receives a radio frequency signal through an antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, FIG. 9 shows only one memory and one processor. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium, a storage device, etc. The memory may be located independently of the processor, or may be integrated with the processor. This is not limited in this embodiment of the present application.

[0278] In this embodiment of the present application, the antenna and the radio frequency circuit having the transceiver functionality may be considered as a transceiver unit of the terminal equipment, and the processor having the processing functionality may be considered as a processing unit of the terminal equipment.

[0279] 9, the terminal device includes a transceiver unit 910 and a processing unit 920. The transceiver unit 910 may also be referred to as a transceiver, a transceiver machine, a transceiver device, etc. The processing unit 920 may also be referred to as a processor, a processing board, a processing module, a processing device, etc.

[0280] Optionally, components in the transceiver unit 910 configured to perform a receiving function may be considered as a receiving unit, and components in the transceiver unit 910 configured to perform a transmitting function may be considered as a transmitting unit. In other words, the transceiver unit 910 includes a receiving unit and a transmitting unit. The transceiver unit may also be referred to as a transceiver machine, a transceiver, a transceiver circuit, etc. The receiving unit may also be referred to as a receiver machine, a receiver, a receiving circuit, etc. The transmitting unit may also be referred to as a transmitting device, a transmitter, a transmitting circuit, etc.

[0281] For example, in one embodiment, the processing unit 920 is configured to perform terminal device side processing operations, for example, the transceiver unit 910 is configured to perform the transmitting and receiving operations in step 404 of FIG.

[0282] In another example, in one embodiment, the transceiver unit 910 is configured to perform the transmitting and receiving operations in steps 501 and 503 of FIG.

[0283] In another example, in one embodiment, the transceiver unit 910 is configured to perform the transmitting and receiving operations in steps 601, 605, 606, and 610 of FIG. 6A.

[0284] In another example, in one embodiment, the transceiver unit 910 is configured to perform the transmitting and receiving operations in steps 601, 605, 611, 615, 617, and 619 of Figures 6A and 6B.

[0285] It should be understood that Fig. 9 is merely an example and is not limiting, and the terminal equipment including the transceiver unit and the processing unit may not rely on the structure shown in Fig. 9.

[0286] When the communication device 900 is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input / output circuit or a communication interface. The processing unit may be a processor, a microprocessor, or an integrated circuit integrated on the chip.

[0287] An embodiment of the present application further provides a communication device 1000. The communication device 1000 may be an access network device or a core network device, or may be a chip. The communication device 1000 may be configured to perform the operations performed by the access network device or the core network device in the above-mentioned method embodiments.

[0288] When the communication device 1000 is an access network device, for example a base station, FIG. 10 is a simplified schematic diagram of the structure of the base station. The base station includes a part 1010 and a part 1020. The part 1010 is mainly configured to transmit and receive radio frequency signals and perform conversion between radio frequency signals and baseband signals. The part 1020 is mainly configured to perform baseband processing, control of the base station, etc. The part 1010 may be generally called a transceiver unit, a transceiver machine, a transceiver circuit, a transceiver, etc. The part 1020 is usually a control center of the base station, may be generally called a processing unit, and is configured to control the base station to perform processing operations on the network device side in the above-mentioned method embodiment.

[0289] The transceiver unit in the portion 1010 may be referred to as a transceiver machine, a transceiver, etc. The transceiver unit includes an antenna and a radio frequency circuit, and the radio frequency circuit is mainly configured to perform radio frequency processing. Optionally, a component in the portion 1010 configured to perform a receiving function may be considered as a receiving unit, and a component in the portion 1010 configured to perform a transmitting function may be considered as a transmitting unit. In other words, the portion 1010 includes a receiving unit and a transmitting unit. The receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc. The transmitting unit may be referred to as a transmitting device, a transmitter, a transmitting circuit, etc.

[0290] The portion 1020 may include one or more boards, each of which may include one or more processors and one or more memories. The processor is configured to read and execute a program in the memory to implement baseband processing functions to control the base station. If there are multiple boards, the boards may be interconnected to increase processing power. In optional implementations, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may share one or more processors simultaneously.

[0291] For example, in one embodiment, the transceiver unit in portion 1010 is configured to perform the transceiver-related steps performed by the access network device in the embodiment shown in Figure 4. Portion 1020 is configured to perform the processing-related steps performed by the access network device in the embodiment shown in Figure 4.

[0292] For example, in yet another embodiment, the transceiver unit in portion 1010 is configured to perform the transceiver-related steps performed by the access network device in the embodiment shown in Figure 5. Portion 1020 is configured to perform the processing-related steps performed by the access network device in the embodiment shown in Figure 5.

[0293] For example, in yet another embodiment, the transceiver unit in portion 1010 is configured to perform the transceiver-related steps performed by the access network device in the embodiment shown in Figures 6A and 6B, and portion 1020 is configured to perform the processing-related steps performed by the access network device in the embodiment shown in Figures 6A and 6B.

[0294] It should be understood that Figure 10 is merely an example and not a limitation, and a network device including a transceiver unit and a processing unit may not rely on the structure shown in Figure 10.

[0295] When the communication device 1000 is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input / output circuit or a communication interface. The processing unit is a processor, a microprocessor, or an integrated circuit integrated on the chip.

[0296] An embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions used to implement the method performed by the terminal equipment or the method performed by the network device in the above-mentioned method embodiments.

[0297] For example, when the computer program is executed by a computer, the computer is enabled to perform the method performed by the terminal equipment or the method performed by the network device in the method embodiments described above.

[0298] An embodiment of the present application further provides a computer program product including instructions, which, when executed by a computer, enable the computer to perform the terminal equipment-performed method or the network device-performed method in the method embodiments described above.

[0299] An embodiment of the present application further provides a communication system, which includes the network device and the terminal equipment in the above-mentioned embodiment.

[0300] For convenience and brevity of description, it is clearly understood by those skilled in the art that the relevant content description and advantageous effects of any communication device provided above should refer to the corresponding method embodiments provided above, and details are not repeated here.

[0301] In an embodiment of the present application, a terminal equipment or a network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called a primary memory). The operating system in the operating system layer may be one or more computer operating systems that implement service processing by using processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer may include applications such as a browser, an address book, a word processing software, and an instant communication software.

[0302] The specific structure of the execution entity of the method provided in the embodiment of the present application is not particularly limited in the embodiment of the present application, as long as the program recording the code of the method provided in the embodiment of the present application can be executed to perform communication according to the method provided in the embodiment of the present application. For example, the method provided in the embodiment of the present application may be executed by a terminal device, a network device, or a function module in a terminal device or a network device that can call and execute a program.

[0303] Aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used herein may encompass a computer program accessible from any computer-readable component, carrier, or media.

[0304] The computer readable storage medium may be any available medium accessible by a computer, or a data storage device that integrates one or more available media, such as a server or a data center. The available medium (or computer readable medium) may include various media that can store program code, such as, but not limited to, magnetic media or magnetic storage devices (e.g., floppy disks, hard disks (e.g., removable hard disks), or magnetic tapes), optical media (e.g., optical disks, compact discs (CDs) or digital versatile discs (DVDs)), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), cards, sticks, or key drives), or semiconductor media (e.g., solid state disks (SSDs), USB flash drives, read-only memory (ROM) or random access memory (RAM)).

[0305] Various storage media described herein may refer to one or more devices and / or other machine-readable media configured to store information. The term "machine-readable medium" can include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0306] It should be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), another general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc.

[0307] It will also be understood that the memory described in the embodiments of the present application may be volatile or non-volatile memory, or may include volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory may be random access memory (RAM). For example, the RAM may be used as an external cache. By way of example and not limitation, RAM may include several forms such as 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), synchlink dynamic random access memory (synchlink DRAM, SLDRAM), and direct rambus random access memory (direct rambus RAM, DR RAM).

[0308] It should be noted that if the processor is a general-purpose processor, a DSP, ASIC, FPGA, or another programmable logic device, discrete gate or transistor logic device, or discrete hardware components, memory (storage module) may be integrated with the processor.

[0309] It should be further noted that memory as described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0310] In some embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely examples. For example, the division into units described above is merely a logical division of functions, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In addition, the illustrated or described mutual couplings, direct couplings, or communication connections may be realized through some interfaces. Indirect couplings or communication connections between apparatuses or units may be implemented in electronic, mechanical, or other forms.

[0311] The aforementioned units described as separate parts may or may not be physically separated, and the parts shown as units may or may not be physical units, and may be located in one place or distributed among multiple network units. To implement the solutions provided in this application, some or all of the units may be selected based on actual requirements.

[0312] In addition, the functional units in the embodiments of the present application may be integrated into one unit, each of the units may exist physically alone, or two or more units may be integrated into one unit.

[0313] All or part of the above embodiments may be implemented using software, hardware, firmware, or any combination thereof.

[0314] When software is used to implement the embodiments, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. For example, the computer may be a personal computer, a server, or a network device. The computer instructions may be stored in a computer-readable storage medium or transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired (e.g., coaxial cable, optical fiber, or digital subscriber line (DSL)) or wireless (e.g., infrared, radio, or microwave) manner. For the computer-readable storage medium, please refer to the above description.

[0315] The above description is merely a specific implementation of the present application, and is not intended to limit the scope of protection of the present application. Any variations or replacements that are easily conceived by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims. [Explanation of symbols]

[0316] 100 Wireless communication system 111 Access Network Devices 121 Terminal Equipment 122 Terminal Equipment 123 Terminal Equipment 200 Wireless communication system 210 Terminal Equipment 220 Access Network Devices 230 Core Network Devices 300 Data Transmission Method 400 Data Transmission Method 500 Data Transmission Method 600 Data Transmission Method 700 Communication Equipment 710 Transceiver Unit 720 Processing Unit 800 Communication Equipment 810 Processor 820 Memory 830 Transceiver 900 Communication Equipment 910 Transceiver Unit 920 Processing Unit 1000 Communication Equipment 1010 parts 1020 parts

Claims

1. A step of receiving first information by an access network device, the first information including service identifier information of a multicast service, first parameter information, and second parameter information, the first parameter information including a paging index value of at least one terminal device in a first set of terminal devices, the first set of terminal devices including at least two terminal devices, the second parameter information including a common tracking area identity list, a TAI list, of each terminal device in a second set of terminal devices, the second set of terminal devices including at least one terminal device, the second set of terminal devices belonging to the first set of terminal devices; determining, by the access network device, a transmission time of second information based on the first information, the second information including the service identifier information of the multicast service; A data transmission method comprising: a step of transmitting, by the access network device, the second information to a first terminal equipment at the transmission time of the second information, the first terminal equipment belonging to the set of the first terminal equipment.

2. The method of claim 1 , wherein the paging index value is calculated based on a non-access stratum identifier of the terminal device.

3. 3. The method according to claim 1 or 2, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal device.

4. A terminal device in the first set of terminal devices is a terminal device that has joined a first multicast group, is in an RRC idle state, and is capable of receiving the multicast service; 4. The method according to any one of claims 1 to 3.

5. The method according to any one of claims 1 to 4, wherein the second parameter information is a common part of all terminal devices in the second set of terminal devices.

6. The method according to claim 1 , wherein the second information is transmitted to all terminal devices in the second set of terminal devices.

7. If the paging index values ​​and tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries a paging index value of one terminal device of the at least two terminal devices; 7. The method according to any one of claims 1 to 6.

8. If the paging index value, the discontinuous reception cycle information, and the tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries the paging index value and the discontinuous reception cycle information of one terminal device of the at least two terminal devices; 7. The method according to any one of claims 1 to 6.

9. The method according to claim 1 , wherein the second information is a paging message.

10. A method according to any one of claims 1 to 8, wherein the first parameter information further includes discontinuous reception cycle information of at least one terminal device in a first set of terminal devices.

11. receiving, by an access network device, first information transmitted by a core network device, the first information including service identifier information of a multicast service and second parameter information, the first information including no paging index value and discontinuous reception cycle information of any terminal device in a first set of terminal devices, the second parameter information including a common tracking area identity list, a TAI list of each terminal device in a second set of terminal devices, the second set of terminal devices including at least one terminal device, the second set of terminal devices belonging to the first set of terminal devices, and the first set of terminal devices including at least two terminal devices; determining, by the access network device, a transmission time of second information based on the first information, the transmission time of the second information being all configured paging times, all configured paging times being paging occasions configured in a cell system broadcast and used for paging, and the second information including the service identifier information of the multicast service; A data transmission method comprising: a step of transmitting, by the access network device, the second information to a first terminal equipment at the transmission time of the second information, the first terminal equipment belonging to the set of the first terminal equipment.

12. The method of claim 11, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal device.

13. 13. The method of claim 12, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal device.

14. A terminal device in the first set of terminal devices is a terminal device that has joined a first multicast group, is in an RRC idle state, and is capable of receiving the multicast service; 14. The method according to any one of claims 11 to 13.

15. 15. The method according to claim 11, wherein the second parameter information is a common part of all terminal devices in the second set of terminal devices.

16. The method according to any one of claims 11 to 15, wherein the second information is a paging message.

17. A step of determining first information by a core network device, the first information including service identifier information of a multicast service, first parameter information, and second parameter information, the first parameter information including a paging index value of at least one terminal device in a first set of terminal devices, the second parameter information including a common tracking area identity list, a TAI list, of each terminal device in a second set of terminal devices, the second set of terminal devices including at least one terminal device, the second set of terminal devices belonging to the first set of terminal devices, the first set of terminal devices including at least two terminal devices, the first information is for determining a transmission time of the second information, and the second information includes the service identifier information of the multicast service; and transmitting the first information by the core network device to an access network device.

18. The method of claim 17, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal device.

19. 20. The method of claim 18, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal device.

20. 20. The method according to claim 17, wherein the second parameter information is a common part of all terminal devices in the second set of terminal devices.

21. If the paging index values ​​and tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries a paging index value of one terminal device of the at least two terminal devices; 21. The method according to any one of claims 17 to 20.

22. If the paging index value, the discontinuous reception cycle information, and the tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries the paging index value and the discontinuous reception cycle information of one terminal device of the at least two terminal devices; 21. The method according to any one of claims 17 to 20.

23. 23. The method according to any one of claims 17 to 22, wherein the second information is a paging message.

24. A method according to any one of claims 17 to 23, wherein the first parameter information further includes discontinuous reception cycle information of at least one terminal device in a first set of terminal devices.

25. A step of determining first information by a core network device, the first information including service identifier information of a multicast service, and second parameter information, the first information does not include paging index values ​​and discontinuous reception cycle information of any terminal equipment in a first set of terminal equipment, the second parameter information including a common tracking area identity list, a TAI list, of each terminal equipment in a second set of terminal equipment, the second set of terminal equipment including at least one terminal equipment, the second set of terminal equipment belonging to the first set of terminal equipment, the first set of terminal equipment including at least two terminal equipment, the first information is for determining a transmission time of second information, the transmission times of the second information being all configured paging times, the all configured paging times being paging occasions configured in a cell system broadcast and used for paging, and the second information including the service identifier information of the multicast service. and transmitting the first information by the core network device to an access network device.

26. 26. The method of claim 25, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal device.

27. 27. The method of claim 26, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal device.

28. A terminal device in the first set of terminal devices is a terminal device that has joined a first multicast group, is in an RRC idle state, and is capable of receiving the multicast service; 28. The method according to any one of claims 25 to 27.

29. 29. The method according to any one of claims 25 to 28, wherein the second parameter information is a common part of all terminal devices in the second set of terminal devices.

30. 29. The method of any one of claims 25 to 28, wherein the second information is a paging message.

31. A transceiver module configured to receive first information, the first information including service identifier information of a multicast service, first parameter information, and second parameter information, the first parameter information including a paging index value of at least one terminal device in a first set of terminal devices, the first set of terminal devices including at least two terminal devices, the second parameter information including a common tracking area identity list, a TAI list, of each terminal device in a second set of terminal devices, the second set of terminal devices including at least one terminal device, the second set of terminal devices belonging to the first set of terminal devices; and a processing module configured to determine a transmission time of second information based on the first information, the second information including the service identifier information of the multicast service; A data transmission device, wherein the transceiver module is further configured to transmit the second information to a first terminal device belonging to the first set of terminal devices at the transmission time of the second information.

32. The data transmission device of claim 31, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal equipment.

33. A data transmission device as claimed in claim 31 or 32, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal equipment.

34. A terminal device in the first set of terminal devices is a terminal device that has joined a first multicast group, is in an RRC idle state, and is capable of receiving the multicast service.

34. A data transmission device according to any one of claims 31 to 33.

35. A data transmission device according to any one of claims 31 to 34, wherein the second parameter information is information of a common portion of all terminal devices in the set of the second terminal devices.

36. A data transmission device described in any one of claims 31 to 35, wherein the second information is transmitted to all terminal equipment in the set of the second terminal equipment.

37. If the paging index values ​​and tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries a paging index value of one terminal device of the at least two terminal devices.

37. A data transmission device according to any one of claims 31 to 36.

38. If the paging index value, the discontinuous reception cycle information, and the tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries the paging index value and the discontinuous reception cycle information of one terminal device of the at least two terminal devices.

38. Data transmission device according to any one of claims 31 to 37.

39. A data transmission device as claimed in any one of claims 31 to 38, wherein the second information is a paging message.

40. A data transmission device as described in any one of claims 31 to 39, wherein the first parameter information further includes discontinuous reception cycle information of at least one terminal device in a first set of terminal devices.

41. A transceiver module configured to receive first information transmitted by a core network device, the first information including service identifier information of a multicast service and second parameter information, the first information including no paging index value and discontinuous reception cycle information of any terminal equipment in a first set of terminal equipment, the second parameter information including a common tracking area identity list, a TAI list of each terminal equipment in a second set of terminal equipment, the second set of terminal equipment including at least one terminal equipment, the second set of terminal equipment belonging to the first set of terminal equipment, and the first set of terminal equipment including at least two terminal equipment; and a processing module configured to determine a transmission time of second information based on the first information, the transmission time of the second information being all configured paging times, the all configured paging times being paging occasions configured in a cell system broadcast and used for paging, and the second information including the service identifier information of the multicast service; A data transmission device, wherein the transceiver module is further configured to transmit the second information to a first terminal device belonging to the first set of terminal devices at the transmission time of the second information.

42. The data transmission device of claim 41, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal equipment.

43. A data transmission device as described in claim 42, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal equipment.

44. A terminal device in the first set of terminal devices is a terminal device that has joined a first multicast group, is in an RRC idle state, and is capable of receiving the multicast service.

44. Data transmission device according to any one of claims 41 to 43.

45. A data transmission device according to any one of claims 41 to 44, wherein the second parameter information is information of a common portion of all terminal devices in the set of the second terminal devices.

46. ​​A data transmission device as claimed in any one of claims 41 to 45, wherein the second information is a paging message.

47. A processing module configured to determine first information, the first information including service identifier information of a multicast service, first parameter information, and second parameter information, the first parameter information including a paging index value of at least one terminal device in a first set of terminal devices, the second parameter information including a common tracking area identity list, a TAI list, of each terminal device in a second set of terminal devices, the second set of terminal devices including at least one terminal device, the second set of terminal devices belonging to the first set of terminal devices, the first set of terminal devices including at least two terminal devices, the first information is for determining a transmission time of second information, and the second information includes the service identifier information of the multicast service; and a transceiver module configured to transmit the first information to an access network device.

48. The data transmission device of claim 47, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal equipment.

49. A data transmission device as described in claim 48, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal equipment.

50. A data transmission device according to any one of claims 47 to 49, wherein the second parameter information is information of a common portion of all terminal devices in the set of the second terminal devices.

51. If the paging index values ​​and tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries a paging index value of one terminal device of the at least two terminal devices. Data transmission device according to any one of claims 47 to 50.

52. If the paging index value, the discontinuous reception cycle information, and the tracking area identity list information of the at least two terminal devices in the first set of terminal devices are the same, the first parameter information carries the paging index value and the discontinuous reception cycle information of one terminal device of the at least two terminal devices.

52. A data transmission device according to any one of claims 47 to 51.

53. A data transmission device as claimed in any one of claims 47 to 52, wherein the second information is a paging message.

54. A data transmission device as described in any one of claims 47 to 53, wherein the first parameter information further includes discontinuous reception cycle information of at least one terminal device in a first set of terminal devices.

55. A processing module configured to determine first information, the first information including service identifier information of a multicast service, and second parameter information, the first information not including paging index values ​​and discontinuous reception cycle information of any terminal equipment in a first set of terminal equipment, the second parameter information including a common tracking area identity list, a TAI list, of each terminal equipment in a second set of terminal equipment, the second set of terminal equipment including at least one terminal equipment, the second set of terminal equipment belonging to the first set of terminal equipment, the first set of terminal equipment including at least two terminal equipment, the first information is for determining a transmission time of second information, the transmission times of the second information being all configured paging times, the all configured paging times being paging occasions configured in a cell system broadcast and used for paging, and the second information including the service identifier information of the multicast service; a transceiver module configured to transmit the first information to an access network device.

56. The data transmission device of claim 55, wherein the paging index value is calculated based on a non-access stratum identifier of the terminal equipment.

57. A data transmission device as described in claim 56, wherein the paging index value is a non-access stratum identifier mod 1024 of the terminal equipment.

58. A terminal device in the first set of terminal devices is a terminal device that has joined a first multicast group, is in an RRC idle state, and is capable of receiving the multicast service.

58. Data transmission device according to any one of claims 55 to 57.

59. A data transmission device according to any one of claims 55 to 58, wherein the second parameter information is information of a common portion of all terminal devices in the set of the second terminal devices.

60. A data transmission device as claimed in any one of claims 55 to 59, wherein the second information is a paging message.

61. A communication device for data transmission, comprising:

17. A communications device comprising a processor configured to execute computer instructions stored in a memory, such that a method according to any one of claims 1 to 16 is performed.

62. A communication device for data transmission, comprising:

31. A communications device comprising a processor configured to execute computer instructions stored in a memory such that a method according to any one of claims 17 to 30 is performed.

63. 17. A computer-readable storage medium having a computer program stored thereon, the computer program causing, when executed by a computer, to perform the method according to any one of claims 1 to 16.

64. A computer-readable storage medium, the computer-readable storage medium storing a computer program, the computer program causing, when executed by a computer, the method of any one of claims 17 to 30 to be performed.

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