# US 2022/0286918 A1 · MBMS Service Communication Method and Base Station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0286918 A1 - Document ID: US20220286918A1 - Status: Published application - Kind: A1 - Application number: 17/827,351 - Filed: 2022-05-27 - Published: 2022-09-08 - Earliest claimed: 2019-11-29 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Jun Wang; Mingzeng Dai; Qinghai Zeng - Web page: https://patentgrep.com/patent/US20220286918A1 ## 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 36/0009: {for a plurality of users or terminals, e.g. group communication or moving wireless networks (user group management H04W4/08; processing of subscriber group data H04W8/186)} - H04W 36/0007: {for multicast or broadcast services, e.g. MBMS (multicast or broadcast application services H04W4/06; resource management for broadcast services H04W72/30; connection management for selective distribution or broadcast H04W76/40)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of this application provide an MBMS service communication method and a base station, and relate to the communication field. The method includes: A source base station obtains first group identity information of an MBMS service of a terminal device in a neighboring cell; and the source base station sends the first group identity information to the terminal device. In this application, after moving to or accessing the neighboring cell, the terminal device may continue to receive service content and information of the MBMS service based on the first group identity information that is of the MBMS service in the neighboring cell and that is obtained from the source base station. ## Claims ### Claim 1 A communication method comprising: obtaining, by a source base station of a terminal device, first group identity information of a multimedia broadcast multicast service (MBMS) in a neighboring cell; and sending, by the source base station, the first group identity information to the terminal device, the first group identity information enabling the terminal device to receive the MBMS in the neighboring cell. ### Claim 2 (depends on 1) The method according to claim 1, wherein when the neighboring cell belongs to a target base station, obtaining the first group identity information of the MBMS in the neighboring cell comprises: requesting, by the source base station, group identity information of the MBMS in the neighboring cell from the target base station; and obtaining, by the source base station in response to requesting the group identity information of the MBMS, the first group identity information indicated by the target base station. ### Claim 3 (depends on 2) The method according to claim 2, wherein requesting the group identity information of the MBMS in the neighboring cell from the target base station comprises: sending, by the source base station, request information to the target base station, wherein the request information comprises second group identity information and indicates that the second group identity information is group identity information of the MBMS in a source cell, and the source cell belongs to the source base station; and obtaining the first group identity information indicated by the target base station comprises: receiving, by the source base station, first indication information sent by the target base station, wherein the first indication information indicates that the first group identity information is same as the second group identity information. ### Claim 4 (depends on 3) The method according to claim 3, wherein sending the first group identity information to the terminal device comprises: sending, by the source base station, third indication information to the terminal device, wherein the third indication information indicates that the first group identity information of the MBMS in the neighboring cell is same as the second group identity information of the MBMS in the source cell. ### Claim 5 (depends on 2) The method according to claim 2, wherein requesting, by the source base station, the group identity information of the MBMS in the neighboring cell from the target base station comprises: sending, by the source base station, request information to the target base station, wherein the request information comprises second group identity information and indicates that the second group identity information is group identity information of the MBMS in a source cell, and the source cell belongs to the source base station; and obtaining, by the source base station, the first group identity information indicated by the target base station comprises: receiving, by the source base station, second indication information sent by the target base station, wherein the second indication information comprises the first group identity information, and the first group identity information is different from the second group identity information. ### Claim 6 (depends on 5) The method according to claim 5, wherein the request information is sent by the source base station to the target base station after the source base station configures the second group identity information for the MBMS; the request information is sent after the terminal device accesses the source base station and before the source base station configures the second group identity information for the MBMS; or the request information is sent by the source base station to the target base station after the source base station determines, based on a measurement report reported by the terminal device, that the terminal device needs to perform cell handover. ### Claim 7 (depends on 1) The method according to claim 1, wherein the neighboring cell comprises a target cell, the target cell is determined based on a measurement report reported by the terminal device and is usable to serve the terminal device, and the measurement report comprises a measurement result of each terminal device in an MBMS service group to which the terminal device belongs. ### Claim 8 A base station comprising: a non-transitory memory and a processor, wherein the memory is coupled to the processor; and the memory stores program instructions; and when the program instructions are executed by the processor, the base station is caused to perform following: obtaining first group identity information of an multimedia broadcast multicast service (MBMS) service in a neighboring cell; and sending the first group identity information to a terminal device served by the base station, the first group identity information enabling the terminal device to receive the MBMS in the neighboring cell. ### Claim 9 (depends on 8) The base station according to claim 8, wherein when the neighboring cell belongs to a target base station, when the program instructions are executed by the processor, the base station is further caused to perform following: requesting group identity information of the MBMS in the neighboring cell from the target base station; and obtaining, in response to requesting the group identity information of the MBMS, the first group identity information, indicated by the target base station. ### Claim 10 (depends on 9) The base station according to claim 9, wherein when the program instructions are executed by the processor, the base station is further caused to perform following: sending request information to the target base station, wherein the request information comprises second group identity information and indicates that the second group identity information is group identity information of the MBMS in a source cell, and the source cell belongs to the base station; and obtaining the first group identity information indicated by the target base station comprises: receiving first indication information sent by the target base station, wherein the first indication information indicates that the first group identity information is same as the second group identity information. ### Claim 11 (depends on 10) The base station according to claim 10, wherein when the program instructions are executed by the processor, the base station is further caused to perform following: sending third indication information to the terminal device, wherein the third indication information indicates that the first group identity information of the MBMS in the neighboring cell is the same as the second group identity information of the MBMS in the source cell. ### Claim 12 (depends on 9) The base station according to claim 9, wherein when the program instructions are executed by the processor, the base station is further caused to perform following: sending request information to the target base station, wherein the request information comprises second group identity information and indicates that the second group identity information is group identity information of the MBMS in a source cell, and the source cell belongs to the base station; and obtaining the first group identity information indicated by the target base station comprises: receiving second indication information sent by the target base station, wherein the second indication information comprises the first group identity information, and the first group identity information is different from the second group identity information. ### Claim 13 (depends on 12) The base station according to claim 12, wherein the request information is sent by the base station to the target base station after the base station configures the second group identity information for the MBMS; the request information is sent after the terminal device accesses the base station and before the base station configures the second group identity information for the MBMS; or the request information is sent by the base station to the target base station after the base station determines, based on a measurement report reported by the terminal device, that the terminal device needs to perform cell handover. ### Claim 14 (depends on 8) The base station according to claim 8, wherein the neighboring cell comprises a target cell, the target cell is determined based on a measurement report reported by the terminal device and is usable to serve the terminal device, and the measurement report comprises a measurement result of each terminal device in an MBMS service group to which the terminal device belongs. ### Claim 15 A base station comprising: a non-transitory memory and a processor, wherein the memory is coupled to the processor; and the memory stores program instructions; and when the program instructions are executed by the processor, the base station is caused to perform following: receiving request information sent by a source base station, wherein the request information requests, from the base station, group identity information of an multimedia broadcast multicast service (MBMS) in a neighboring cell of the base station; and indicating first group identity information of the MBMS in the neighboring cell to the source base station based on the request information. ### Claim 16 (depends on 15) The base station according to claim 15, wherein when the program instructions are executed by the processor, the base station is further caused to perform following: sending first indication information to the source base station when the base station detects that the first group identity information configured for the MBMS exists, wherein the first indication information comprises the first group identity information. ### Claim 17 (depends on 15) The base station according to claim 15, wherein when the program instructions are executed by the processor, the base station is further caused to perform following: when the base station does not detect group identity information configured for the MBMS, configuring the first group identity information for the MBMS, and sending second indication information to the source base station, wherein the second indication information comprises the first group identity information. ### Claim 18 (depends on 15) The base station according to claim 15, wherein the request information comprises second group identity information and indicates that the second group identity information is group identity information of the MBMS in a source cell; and when the program instructions are executed by the processor, the base station is further caused to perform following: determining, based on the request information, whether the first group identity information of the MBMS in the neighboring cell is same as the second group identity information; and when the group identity information is the same as the second group identity information, sending third indication information to the source base station, wherein the third indication information indicates that the first group identity information is the same as the second group identity information. ### Claim 19 (depends on 15) The base station according to claim 15, wherein the request information comprises second group identity information and indicates that the second group identity information is group identity information of the MBMS in a source cell; and when the program instructions are executed by the processor, the base station is further caused to perform following: determining, based on the request information, whether the first group identity information of the MBMS in the neighboring cell is same as the second group identity information; when the first group identity information is different the second group identity information, configuring the first group identity information for the MBMS; and sending fourth indication information to the source base station, wherein the fourth indication information comprises the first group identity information. ### Claim 20 (depends on 15) The base station according to claim 15, wherein the first group identity information comprises a group radio network temporary identifier (G-RNTI), or the first group identity information is a temporary mobile group identity (TMGI).