# US 2020/0403685 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 2020/0403685 A1 - Document ID: US20200403685A1 - Status: Published application - Kind: A1 - Application number: 17/013,382 - Filed: 2020-09-04 - Published: 2020-12-24 - 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/US20200403685A1 ## 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 1 A method for determining frame timing, comprising: receiving, by a terminal device, beam-specific information through a beam, the beam-specific information comprising a control channel time-frequency region indication field, the control channel time-frequency region indication field being used to indicate a size of a time-frequency region of a control channel sent through the beam; and determining, by the terminal device, the size of the time-frequency region of the control channel according to the control channel time-frequency region indication field. ### Claim 2 (depends on 1) The method of claim 1, wherein the beam-specific information further comprises a system bandwidth indication field, and the method further comprises: determining, by the terminal device, according to the system bandwidth indication field, a total bandwidth occupied by a signal received through the beam and a frequency-domain offset between a central frequency point of the total bandwidth and a central frequency point of a cell. ### Claim 3 (depends on 1) The method of claim 1, wherein the beam is a beam of a plurality of beams in a cell where the terminal device is, and synchronization signals sent through different beams have different time-frequency offsets relative to the frame timing. ### Claim 4 (depends on 1) The method of claim 1, wherein the receiving, by the terminal device, the beam-specific information through the beam comprises: searching, by the terminal device, a search region belonging to the terminal device to acquire the beam-specific information. ### Claim 5 A method for determining frame timing, comprising: determining, by a network device, a time-domain location where a synchronization signal is sent through a beam of a plurality of beams; and sending, by the network device, the synchronization signal and beam-specific information to a terminal device, wherein the beam-specific information comprises a control channel time-frequency region indication field, the control channel time-frequency region indication field is used to indicate a size of a time-frequency region of a control channel sent through the beam. ### Claim 6 (depends on 5) The method of claim 5, wherein the beam-specific information further comprises a system bandwidth indication field, and the system bandwidth indication field is used to instruct the terminal device to determine, according to the system bandwidth indication field, a total bandwidth occupied by a signal received through the beam and a frequency-domain offset between a central frequency point of the total bandwidth and a central frequency point of a cell. ### Claim 7 (depends on 5) The method of claim 5, wherein synchronization signals sent through different beams have different time-frequency offsets relative to the frame timing. ### Claim 8 A terminal device, comprising: a processor; and a transceiver coupled with the processor, wherein the processor is configured to receive, through the transceiver, beam-specific information through a beam, the beam-specific information comprising a control channel time-frequency region indication field, the control channel time-frequency region indication field being used to indicate a size of a time-frequency region of a control channel sent through the beam; and determine the size of the time-frequency region of the control channel according to the control channel time-frequency region indication field. ### Claim 9 (depends on 8) The terminal device of claim 8, wherein the beam-specific information further comprises a system bandwidth indication field, and the processor is configured to: determine, according to the system bandwidth indication field, a total bandwidth occupied by a signal received through the beam and a frequency-domain offset between a central frequency point of the total bandwidth and a central frequency point of a cell. ### Claim 10 (depends on 8) The terminal device of claim 8, wherein the beam is a beam of a plurality of beams in a cell where the terminal device is, and synchronization signals sent through different beams have different time-frequency offsets relative to the frame timing. ### Claim 11 (depends on 8) The terminal device of claim 8, wherein the processor is configured to search a search region belonging to the terminal device to acquire, through the transceiver, the beam specific information. ### Claim 12 A network device, comprising: a processor; a transceiver coupled with the processor, wherein the processor is configured to determine a time-domain location where a synchronization signal is sent through a beam of a plurality of beams; and send, through the transceiver, the synchronization signal and beam-specific information to a terminal device, wherein the beam-specific information comprises a control channel time-frequency region indication field, the control channel time-frequency region indication field is used to indicate a size of a time-frequency region of a control channel sent through the beam. ### Claim 13 (depends on 12) The network device of claim 12, wherein the beam-specific information further comprises a system bandwidth indication field, and the system bandwidth indication field is used to instruct the terminal device to determine, according to the system bandwidth indication field, a total bandwidth occupied by a signal received through the beam and a frequency-domain offset between a central frequency point of the total bandwidth and a central frequency point of a cell. ### Claim 14 (depends on 12) The network device of claim 12, wherein synchronization signals sent through different beams have different time-frequency offsets relative to the frame timing.