# US 2019/0174529 A1 · Multicast-based wireless communication method, terminal device, 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 2019/0174529 A1 - Document ID: US20190174529A1 - Status: Published application - Kind: A1 - Application number: 16/272,715 - Filed: 2019-02-11 - Published: 2019-06-06 - Earliest claimed: 2016-08-11 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co.,Ltd. - Inventors: Xiaolei Tie; Tong Ji; Meng Hua - Web page: https://patentgrep.com/patent/US20190174529A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - 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] - H04W 68/005: {Transmission of information for alerting of incoming communication} - H04W 76/11: Allocation or use of connection identifiers - H04W 72/30: Resource management for broadcast services - 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 the present invention provide a multicast-based wireless communication method, a terminal device, and a base station. The method includes: in a process of receiving a current multicast service, receiving, by a terminal device, downlink control information DCI transmitted by a base station, where the DCI is used to schedule a current multicast traffic channel MTCH, and the DCI includes indication information used to indicate that configuration information of the MTCH is modified in a next modification period MP or a current MP; and obtaining, by the terminal device, modified configuration information according to the indication information. System flexibility is improved according to the embodiments of the present invention. ## Claims ### Claim 1 A multicast-based wireless communication method, comprising: receiving, by a terminal device, downlink control information (DCI) transmitted by a base station, wherein: the DCI is used to schedule a current multicast traffic channel (MTCH), the DCI comprises indication information, and the indication information is used to indicate that configuration information of the current MTCH is modified in a next modification period (MP) or in a current MP; and obtaining, by the terminal device, modified configuration information of the current MTCH according to the indication information. ### Claim 2 (depends on 1) The method according to claim 1, wherein: the configuration information of the MTCH comprises configuration information of a physical downlink control channel (PDCCH) search space, and the PDCCH search space is used to transmit the DCI for scheduling the MTCH. ### Claim 3 (depends on 1) The method according to claim 1, wherein the indication information is further used to indicate that configuration information of another MTCH in a current cell of the base station is modified in the next MP or the current MP. ### Claim 4 (depends on 1) The method according to claim 1, wherein before the receiving, by a terminal device, DCI transmitted by a base station, the method further comprises: monitoring, by the terminal device, the search space of the DCI for scheduling the current MTCH on a physical downlink control channel (PDCCH), but skipping monitoring a search space of DCI for scheduling an MCCH. ### Claim 5 A multicast-based wireless communication method, comprising: generating, by a base station, downlink control information (DCI), wherein the DCI is used to schedule a first multicast traffic channel (MTCH), the DCI comprises indication information, and the indication information is used to indicate that configuration information of the first MTCH is modified in a next modification period (MP) or a current MP; and transmitting, by the base station, the DCI to a terminal device. ### Claim 6 (depends on 5) The method according to claim 5, wherein the configuration information of the MTCH comprises configuration information of physical downlink control channel (PDCCH) search space, and the PDCCH search space is used to transmit the DCI for scheduling the MTCH. ### Claim 7 (depends on 5) The method according to claim 5, wherein the indication information is further used to indicate that configuration information of a second MTCH in a current cell is modified in the next MP or the current MP. ### Claim 8 A terminal device, comprising: a memory that stores program code; a processor coupled to the processor; wherein the processor is configured to execute the stored program code to perform the steps of: receiving downlink control information (DCI) transmitted by a base station, wherein the DCI is used to schedule a current multicast traffic channel (MTCH), the DCI comprises indication information, and the indication information is used to indicate that configuration information of the current MTCH is modified in a next modification period (MP) or a current MP; and obtaining modified configuration information of the current MTCH according to the indication information. ### Claim 9 (depends on 8) The terminal device according to claim 8, wherein the configuration information of the MTCH comprises configuration information of a physical downlink control channel (PDCCH) search space, and the PDCCH search space is used to transmit the DCI for scheduling the MTCH. ### Claim 10 (depends on 8) The terminal device according to claim 8, wherein the indication information is further used to indicate that configuration information of another MTCH in a current cell of the base station is modified in the next MP or the current MP. ### Claim 11 (depends on 8) The terminal device according to claim 8, wherein when executing the store program codes, the processor further to performs: before receiving the DCI, monitoring the search space of the DCI for scheduling the current MTCH on a physical downlink control channel, but skiping monitoring a search space of DCI for scheduling an MCCH. ### Claim 12 A base station, comprising: a processor and a memory coupled to the processor; wherein the processor is configured to execute store program codes to perform: generating downlink control information (DCI), wherein the DCI is used to schedule a first multicast traffic channel (MTCH), the DCI comprises indication information, and the indication information is used to indicate that configuration information of the first MTCH is modified in a next modification period (MP) or a current MP; and transmitting the DCI to a terminal device. ### Claim 13 (depends on 12) The base station according to claim 12, wherein the configuration information of the MTCH comprises configuration information of physical downlink control channel (PDCCH) search space, and the PDCCH search space is used to transmit the DCI for scheduling the MTCH. ### Claim 14 (depends on 12) The base station according to claim 12, wherein the indication information is further used to indicate that configuration information of a second MTCH in a current cell is modified in the next MP or the current MP.