# US 2019/0174270 A1 · Service transmission method and wireless communications device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174270 A1 - Document ID: US20190174270A1 - Status: Published application - Kind: A1 - Application number: 16/271,885 - Filed: 2019-02-11 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Baokun SHAN; Yinghui YU; Li CHEN - Web page: https://patentgrep.com/patent/US20190174270A1 ## CPC - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Embodiments can provide a transmission method and a wireless communications device. For achieving such, a multicast coverage level of a multicast service can be determined by a group communication application server. The multicast coverage level may be a coverage level used when a network device corresponding to the cell transmits the service in multicast mode. A multicast transmission indicator can be sent, by the group communication application server, to a network device of the multicast service through a BM-SC, an MME, and an MCE. The multicast coverage level indication information may correspond to the multicast coverage level. According to the method and the wireless communications device provided, a network element in a core network may determine a multicast coverage level based on a coverage level of a subscription terminal ## Claims ### Claim 1 A service transmission method, comprising: determining, by a group communication service application server (GCS AS), a multicast coverage level of a multicast service, wherein the multicast coverage level is a coverage level used when a network device corresponding to a cell transmits the service in multicast mode; and sending, by the GCS AS, a multicast transmission indication to a network device of the multicast service through a broadcast/multicast service center (BM-SC), a mobility management entity (MME), and a multimedia broadcast multicast coordination entity (MCE), wherein the multicast transmission indicator carries multicast coverage level indication information, and the multicast coverage level indication information corresponds to the multicast coverage level. ### Claim 2 (depends on 1) The method according to claim 1, wherein determining, by the GCS AS, the multicast coverage level of a multicast service comprises: obtaining, by the GCS AS, a coverage level of a subscription terminal, wherein the subscription terminal is a terminal device that subscribes to the multicast service; and determining, by the GCS AS, the multicast coverage level based on the coverage level of the subscription terminal. ### Claim 3 (depends on 2) The method according to claim 2, wherein obtaining, by the GCS AS, the coverage level of the subscription terminal comprises: when registration information sent by the subscription terminal carries the coverage level of the subscription terminal, obtaining, by the GCS AS, the coverage level of the subscription terminal from the registration information; or determining, by the GCS AS, the coverage level of the subscription terminal based on a first transmission parameter used when the subscription terminal reports the registration information. ### Claim 4 (depends on 1) The method according to claim 1, wherein determining, by the GCS AS, the multicast coverage level of the service comprises: determining, by the GCS AS, the multicast coverage level based on subscription information of the service. ### Claim 5 A service transmission method, comprising: receiving, by a network device, a multicast transmission indicator, wherein the multicast transmission indicator is configured for instructing the network device to send a specified service in multicast mode; determining, by the network device, a service coverage level of the specified service, wherein the service coverage level is a coverage level used when the specified service is sent in multicast mode; and sending, by the network device, the specified service in multicast mode based on a transmission parameter corresponding to the service coverage level. ### Claim 6 (depends on 5) The method according to claim 5, wherein determining, by the network device, the service coverage level based on the coverage level indication information comprises: determining, by the network device, a multicast coverage level corresponding to the coverage level indication information; and when the network device supports the multicast coverage level, using, by the network device, the multicast coverage level as the service coverage level. ### Claim 7 (depends on 5) The method according to claim 5, wherein determining, by the network device, the service coverage level based on the coverage level indication information comprises: determining, by the network device, a multicast coverage level corresponding to the coverage level indication information; and when the network device does not support the multicast coverage level, selecting, by the network device, one coverage level from one or more supported coverage levels as the service coverage level, wherein the one or more supported coverage levels are coverage levels supported by the network device. ### Claim 8 (depends on 7) The method according to claim 7, wherein selecting, by the network device, one coverage level from one or more supported coverage levels as the service coverage level comprises: when the one or more supported coverage levels are all higher than the multicast coverage level, selecting, by the network device, one coverage level having a lowest level from the one or more supported coverage levels as the service coverage level. ### Claim 9 (depends on 7) The method according to claim 7, wherein selecting, by the network device, one coverage level from one or more supported coverage levels as the service coverage level comprises: when the multicast coverage level is higher than any of the one or more supported coverage levels, selecting, by the network device, one coverage level having a highest level from the one or more supported coverage levels as the service coverage level. ### Claim 10 (depends on 8) The method according to claim 8, wherein determining, by the network device, the service coverage level comprises: sending, by the network device, a coverage level reporting notification to each terminal device; receiving, by the network device, a coverage level of a subscription terminal reported by the subscription terminal in response to the coverage level reporting notification, wherein the subscription terminal is a terminal device that subscribes to the specified service; and determining, by the network device, the service coverage level based on the coverage level of the subscription terminal. ### Claim 11 A group communication service application server (GCS AS), comprising: a processor, configured to determine a multicast coverage level of a multicast service, wherein the multicast coverage level is a coverage level used when a network device corresponding to a cell transmits the service in multicast mode; and a transmitter, configured to send a multicast transmission indication to a network device of the multicast service through a broadcast/multicast service center (BM-SC), a mobility management entity (MME), and a multimedia broadcast multicast service coordination entity (MCE), wherein the multicast coverage level indication information corresponds to the multicast coverage level determined by the processor. ### Claim 12 (depends on 11) The group communication application server according to claim 11, wherein the processor is further configured to: obtain a coverage level of a subscription terminal, wherein the subscription terminal is a terminal device that subscribes to the multicast service; and determine the multicast coverage level based on the coverage level of the subscription terminal. ### Claim 13 (depends on 12) The group communication application server according to claim 12, wherein the processor is further configured to: when registration information sent by the subscription terminal carries the coverage level of the subscription terminal, obtain the coverage level of the subscription terminal from the registration information; or determine the coverage level of the subscription terminal based on a first transmission parameter used when the subscription terminal reports the registration information. ### Claim 14 A network device, comprising: a receiver, configured to receive a multicast transmission indicator, wherein the multicast transmission indicator is configured for instructing the network device to send a specified service in multicast mode; a processor, configured to determine a service coverage level of the specified service, wherein the service coverage level is a coverage level used when the specified service is sent in multicast mode; and a transmitter, configured to send the specified service in multicast mode based on a transmission parameter corresponding to the service coverage level. ### Claim 15 (depends on 14) The network device according to claim 14, wherein the processor is further configured to: determine a multicast coverage level corresponding to the coverage level indication information; and when the network device supports the multicast coverage level, use the multicast coverage level as the service coverage level; or when the network device does not support the multicast coverage level, select one coverage level from the one or more supported coverage levels as the service coverage level, wherein the one or more supported coverage levels are coverage levels supported by the network device. ### Claim 16 (depends on 15) The network device according to claim 15, wherein the processor is further configured to: when one or more supported coverage levels are all higher than the multicast coverage level, select one coverage level having a lowest level from the one or more supported coverage levels as the service coverage level; or when the multicast coverage level is higher than any of the one or more support coverage levels, select one coverage level having a highest level from the one or more supported coverage levels as the service coverage level. ### Claim 17 (depends on 14) The network device according to claim 14, wherein the transmitter is further configured to send a coverage level reporting notification to each terminal device; the receiver is further configured to receive a coverage level of a subscription terminal reported by the subscription terminal in response to the coverage level reporting notification, wherein the subscription terminal is a terminal device that subscribes to the specified service; and the processor is further configured to determine the service coverage level based on the coverage level of the subscription terminal.