Control information processing method, base station, and terminal
A control information processing method, a base station, and a terminal are provided. A base station determines jointly encoded control information for an uplink subframe, where the jointly encoded control information is control information obtained by jointly encoding first control information and second control information; and the base station sends the jointly encoded control information. A terminal receives jointly encoded control information sent by a base station, where the jointly encoded control information is for an uplink subframe, and is control information obtained by jointly encoding first control information and second control information; and the terminal performs clear channel assessment CCA based on the jointly encoded control information, and occupies, after finishing the CCA, the uplink subframe to send a signal. According to the present invention, control signaling overheads can be reduced.
1. A method, comprising:
receiving, by a terminal, jointly encoded control information for an uplink subframe from a base station, wherein the jointly encoded control information is jointly encoded first control information and second control information, the first control information comprises a first starting time indicating a starting position when the uplink subframe is available for the terminal to start signal transmission, and the second control information comprises a type of clear channel assessment (CCA) for the uplink subframe; and
in response to the jointly encoded control information, performing, by the terminal, listen before talk (LBT), and when the LBT succeeds, sending, by the terminal, a signal by occupying the uplink subframe; or
in response to the jointly encoded control information, sending, by the terminal, the signal by occupying the uplink subframe without performing LBT in the uplink subframe.
2. The method according to claim 1 , wherein:
the first control information indicates that a first starting time is the same as a second starting time, wherein the first starting time indicates a starting position when the uplink subframe is available for the terminal to start signal transmission, and the second starting time is a starting time of the uplink subframe; and
the second control information indicates that a type of CCA for the uplink subframe is a single timeslot-based CCA.
3. The method according to claim 2 , wherein:
sending, by the terminal, the signal by occupying the uplink subframe without performing LBT in the uplink subframe comprises: if the terminal occupies a channel before the second starting time, sending, by the terminal, the signal started at the second starting time without performing LBT in the uplink subframe; or
performing, by the terminal, the LBT comprises:
if the terminal does not occupy a channel before the second starting time, the terminal performs the single timeslot-based CCA before the second starting time, and sending, by the terminal, the signal by occupying the uplink subframe, comprises: sending, by the terminal, the signal started at the second starting time.
4. The method according to claim 1 , wherein:
the first control information indicates that a first starting time is the same as a second starting time, wherein the first starting time indicates a starting position when the uplink subframe is available for the terminal to start signal transmission, and the second starting time is a starting time of the uplink subframe; and
the second control information indicates that a type of CCA for the uplink subframe is random backoff-based CCA.
5. The method according to claim 4 , wherein:
sending, by the terminal, the signal by occupying the uplink subframe without performing LBT in the uplink subframe comprises: if the terminal occupies a channel before the second starting time, sending, by the terminal, the signal started at the second starting time without performing LBT in the uplink subframe; or
performing, by the terminal, the LBT comprises:
if the terminal does not occupy a channel before the second starting time, the terminal performs the random backoff-based CCA before the second starting time, and sending, by the terminal, the signal by occupying the uplink subframe, comprises: sending, by the terminal, the signal started at the second starting time.
6. The method according to claim 1 , wherein:
the first control information indicates that the first starting time is after a second starting time, wherein an interval between the first starting time and the second starting time is a third time, and the second starting time is a starting time of the uplink subframe; and
the second control information instructs the terminal to skip performing LBT and to send the signal by occupying the uplink subframe.
7. An apparatus, comprising:
a transmitter; a processor; and
a receiver configured to receive jointly encoded control information for an uplink subframe from a base station, wherein the jointly encoded control information is jointly encoded first control information and second control information, the first control information comprises a first starting time indicating a starting position when the uplink subframe is available for the terminal to start signal transmission, the second control information comprises a type of clear channel assessment (CCA) for the uplink subframe;
in response to the jointly encoded control information, the processor controls the receiver to perform listen before talk (LBT), and when the LBT succeeds, the transmitter is configured to send a signal by occupying the uplink subframe; or
in response to the jointly encoded control information, the transmitter is configured to send the signal by occupying the uplink subframe without performing LBT in the uplink subframe.
8. The apparatus according to claim 7 , wherein:
the first control information indicates that a first starting time is the same as a second starting time, wherein the first starting time indicates a starting position when the uplink subframe is available for the apparatus to start signal transmission, and the second starting time is a starting time of the uplink subframe; and
the second control information indicates that a type of CCA for the uplink subframe is a single timeslot-based CCA.
9. The apparatus according to claim 8 , wherein:
the transmitter being configured to send the signal by occupying the uplink subframe without performing LBT in the uplink subframe comprises: if the apparatus occupies a channel before the second starting time, sending, by the transmitter, the signal started at the second starting time without performing LBT in the uplink subframe; or
the processor controls the receiver to perform LBT, comprising: if the apparatus does not occupy a channel before the second starting time, the processor controls the receiver to perform the single timeslot-based CCA before the second starting time, and the transmitter being configured to send the signal by occupying the uplink subframe comprises: sending, by the transmitter, the signal started at the second starting time.
10. The apparatus according to claim 7 , wherein:
the first control information indicates that a first starting time is the same as a second starting time, wherein the first starting time indicates a starting position when the uplink subframe is available for the apparatus to start signal transmission, and the second starting time is a starting time of the uplink subframe; and
the second control information indicates that a type of CCA for the uplink subframe is random backoff-based CCA.
11. The apparatus according to claim 10 , wherein:
the transmitter being configured to send the signal by occupying the uplink subframe without performing LBT in the uplink subframe comprises: if the apparatus occupies a channel before the second starting time, sending, by the transmitter, the signal started at the second starting time without performing LBT in the uplink subframe; or
the processor controls the receiver to perform LBT, comprising: if the apparatus does not occupy a channel before the second starting time, the processor controls the receiver to perform the random backoff-based CCA before the second starting time, and the transmitter being configured to send the signal by occupying the uplink subframe comprises: sending, by the transmitter, the signal started at the second starting time.
12. The apparatus according to claim 7 , wherein:
the first control information indicates that the first starting time is after a second starting time, wherein an interval between the first starting time and the second starting time is a third time, and the second starting time is a starting time of the uplink subframe; and
the second control information instructs the apparatus to skip performing LBT and to send the signal by occupying the uplink subframe.
13. A non-transitory computer readable storage medium, comprising computer program codes which when executed by a computer processor cause the processor to facilitate performing:
receiving jointly encoded control information for an uplink subframe from a base station, wherein the jointly encoded control information is jointly encoded first control information and second control information, wherein the first control information comprises a first starting time, wherein the first starting time indicating a starting position when the uplink subframe is available for the terminal to start signal transmission, the second control information comprises a type of clear channel assessment (CCA) for the uplink subframe; and
in response to the jointly encoded control information, performing listen before talk (LBT), and when the LBT succeeds, sending a signal by occupying the uplink subframe; or
in response to the jointly encoded control information, sending the signal by occupying the uplink subframe without performing LBT in the uplink subframe.
14. The non-transitory computer readable storage medium according to claim 13 , wherein:
the first control information indicates that a first starting time is the same as a second starting time, wherein the first starting time indicates a starting position when the uplink subframe is available for the processor to facilitate signal transmission, and the second starting time is a starting time of the uplink subframe; and
the second control information indicates that a type of CCA for the uplink subframe is a single timeslot-based CCA.
15. The non-transitory computer readable storage medium according to claim 14 , wherein:
sending the signal by occupying the uplink subframe without performing LBT in the uplink subframe comprises: if the compute processor occupies a channel before the second starting time, sending the signal started at the second starting time without performing LBT in the uplink subframe; or
performing the LBT comprises:
if the processor does not occupy a channel before the second starting time, performing the single timeslot-based CCA before the second starting time, and sending the signal by occupying the uplink subframe comprises: sending the signal started at the second starting time.
16. The non-transitory computer readable storage medium according to claim 13 , wherein:
the first control information indicates that a first starting time is the same as a second starting time, wherein the first starting time indicates a starting position when the uplink subframe is available for the processor to facilitate signal transmission, and the second starting time is a starting time of the uplink subframe; and
the second control information indicates that a type of CCA for the uplink subframe is random backoff-based CCA.
17. The non-transitory computer readable storage medium according to claim 16 , wherein:
sending the signal by occupying the uplink subframe without performing LBT in the uplink subframe comprises: if the compute processor occupies a channel before the second starting time, sending the signal started at the second starting time; or
performing the LBT comprises:
if the processor does not occupy a channel before the second starting time, performing the random backoff-based CCA before the second starting time, and sending the signal by occupying the uplink subframe comprises: sending the signal started at the second starting time.