# US 2021/0242927 A1 · Method for determining frame timing, network device, and terminal device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242927 A1 - Document ID: US20210242927A1 - Status: Published application - Kind: A1 - Application number: 17/239,493 - Filed: 2021-04-23 - Published: 2021-08-05 - Earliest claimed: 2018-12-11 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Hai TANG - Web page: https://patentgrep.com/patent/US20210242927A1 ## CPC - H04B 7/088: {using beam selection} - H04W 48/10: using broadcasted information - H04W 48/12: using downlink control channel - Y02D 30/70: in wireless communication networks - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method for determining frame timing, a terminal device and a network device are provided. The method for determining frame timing includes that: a terminal device receives beam-specific information sent by a network device through a beam, here, the beam-specific information includes a sequence number of a time-domain location where a synchronization signal is sent through the beam; the terminal device determines a time-domain offset between the synchronization signal and the frame timing according to a correspondence of a sequence number of the beam, the sequence number of the time-domain location where the synchronization signal is sent and the time-domain offset; and the terminal device determines the frame timing according to the time-domain offset. ## Claims ### Claim at position 1 1-14. (canceled) ### Claim 15 A method for signal transmission, comprising: generating, by a network device, a respective beam-specific information corresponding to each of a plurality of beams, wherein the beam-specific information comprises a control channel time-frequency region indication field, a first beam-specific information of a first beam of the plurality of beams is used to indicate a configuration parameter of the first beam and the configuration parameter of the first beam is used for at least one terminal device in coverage of the first beam to acquire a size and location of a time-frequency region of a first control channel corresponding to the first beam; and sending, by the network device, corresponding beam-specific information to terminal devices in a same cell through each beam. ### Claim 16 (depends on 15) The method of claim 15, wherein the first control channel comprises a common search space and a User Equipment (UE)-specific search space, and wherein the common search space is used to carry common information of the first beam, the UE-specific search space is used to carry specific information of each of the at least one terminal device in the coverage of the first beam, and each terminal device communicates with the network device through the first beam. ### Claim 17 (depends on 15) The method of claim 15, further comprising: allocating, by the network device, different User Equipment (UE)-specific codes for different terminal devices among the at least one terminal device in the coverage of the first beam, wherein a first terminal device of the at least one terminal device corresponds to a first UE-specific code; and scrambling, by the network device, first control signaling corresponding to the first terminal device in the first control channel, according to the first UE-specific code. ### Claim 18 (depends on 17) The method of claim 17, further comprising: determining, by the network device, a location and size of a UE-specific search space corresponding to the first terminal device in the first control channel, according to the size of the first control channel and the first UE-specific code. ### Claim 19 A method for signal transmission, comprising: receiving, by a first terminal device, first beam-specific information, wherein the first beam-specific information comprises a control channel time-frequency region indication field and is used to indicate a configuration parameter of a first beam of a plurality of beams, each of the plurality of beams is used to send corresponding beam-specific information to terminal devices in a same cell, and the first terminal device is located in coverage of the first beam; and determining, by the first terminal device, a size and location of a time-frequency region of a first control channel corresponding to the first beam, according to the control channel time-frequency region indication field. ### Claim 20 (depends on 19) The method of claim 19, wherein the first control channel comprises a common search space and a User Equipment (UE)-specific search space; and the method further comprises: determining, by the first terminal device, common information of the first beam according to the common search space; and determining, by the first terminal device, specific information of the first terminal device according to the UE-specific search space. ### Claim 21 (depends on 19) The method of claim 19, wherein different terminal devices in the coverage of the first beam have different User Equipment (UE)-specific codes, the first terminal device corresponds to a first UE-specific code; and the method further comprises: descrambling, by the first terminal device, first control signaling corresponding to the first terminal device in the first control channel, according to the first UE-specific code. ### Claim 22 (depends on 21) The method of claim 21, further comprising: determining, by the first terminal device, a location and size of a UE-specific search space corresponding to the first terminal device in the first control channel, according to the size of the first control channel and the first UE-specific code. ### Claim 23 A terminal device, comprising: a processor; and a transceiver coupled with the processor, wherein the processor is configured to receive, through the transceiver, first beam-specific information, wherein the first beam-specific information comprises a control channel time-frequency region indication field and is used to indicate a configuration parameter of a first beam of a plurality of beams, each of the plurality of beams is used to send corresponding beam-specific information to terminal devices in a same cell, and the terminal device is located in coverage of the first beam; and determine a size and location of a time-frequency region of a first control channel corresponding to the first beam, according to the control channel time-frequency region indication field. ### Claim 24 (depends on 23) The terminal device of claim 23, wherein the first control channel comprises a common search space and a User Equipment (UE)-specific search space; and the processor is configured to: determine common information of the first beam according to the common search space; and determine specific information of the terminal device according to the UE-specific search space. ### Claim 25 (depends on 23) The terminal device of claim 23, wherein different terminal devices in the coverage of the first beam have different User Equipment (UE)-specific codes, the terminal device corresponds to a first UE-specific code; and the processor is configured to: descramble, according to the first UE-specific code, first control signaling corresponding to the terminal device in the first control channel. ### Claim 26 (depends on 25) The terminal device of claim 25, wherein the processor is configured to determine, according to the size of the first control channel and the first UE-specific code, a location and size of a UE-specific search space corresponding to the terminal device in the first control channel.