US Patent No. 10,893,541

CLEAR CHANNEL ASSESMENT (CCA) IN UNLICENSED WIRELESS SPECTRUM


Patent No. 10,893,541
Issue Date January 12, 2021
Title Clear Channel Assesment (cca) In Unlicensed Wireless Spectrum
Inventorship Chunhua You, Shanghai (CN)
Qufang Huang, Shanghai (CN)
Assignee HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)

Claim of US Patent No. 10,893,541

9. A terminal device, wherein the terminal device comprises:a receiver, configured to receive first configuration information and instruction information that are sent by a base station, wherein
the first configuration information and the instruction information are information obtained by the base station,
the first configuration information includes channel contention configuration information before uplink data is sent, the channel contention configuration information specifying at least one manner by which a terminal device contends for a current channel, wherein the first configuration information comprises duration information and time domain location information of a channel contention time,
wherein the time domain location of the channel contention time is located in a first subframe and an uplink resource carrying the uplink data is located in a second subframe that is next adjacent to the first subframe, and
the instruction information includes information that instructs the terminal device to send a channel occupancy indication signal on a last symbol of the first subframe, the channel occupancy indication signal indicating that a current channel belongs to a radio access technology user; and
a transmitter, configured to:
send the channel occupancy indication signal based on the first configuration information and the instruction information;
send second configuration information to the terminal device, wherein the second configuration information is configuration information of the channel occupancy indication signal, wherein the instruction information comprises information that instructs the base station to select the terminal device from a cell served by the base station as a terminal device that sends the channel occupancy indication signal, and the second configuration information comprises reference signal sequence information and bandwidth information of the channel occupancy indication signal; and
send duration information of a channel contention time in the first configuration information to the terminal device in a unicast or broadcast manner by using an RRC message, and send time domain location information of the channel contention time in the first configuration information and the instruction information to the terminal device in a unicast or broadcast manner by using a physical layer message; or send duration information and time domain location information of a channel contention time in the first configuration information to the terminal device in a unicast or broadcast manner by using the RRC message, and send the instruction information to the terminal device in a unicast or broadcast manner by using a physical layer message.