Method for sending control information, apparatus, and system
A method for sending control information includes: determining, by a network device based on a first time-frequency domain resource for sending first control information, at least one information field included in the first control information; determining, by the network device, a quantity of bits of the first control information based on the at least one information field; and sending, by the network device, the first control information to a user terminal on the first time-frequency domain resource based on the quantity of bits of the first control information. The present application can improve data transmission efficiency.
1. A method for sending control information, the method comprising:
determining, by a network device, at least one information field comprised in first control information based on a first time-frequency domain resource for sending the first control information;
determining, by the network device, a quantity of bits of the first control information based on the at least one information field; and
sending, by the network device, the first control information to a user terminal on the first time-frequency domain resource based on the quantity of bits of the first control information;
wherein the first time-frequency domain resource is a time-frequency domain resource beyond a first time region;
wherein the at least one information field comprises a second information field;
wherein information carried in the second information field indicates:
a time-frequency domain resource not occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink data channel; and
wherein the first time region is a time region to which first two symbols in a downlink subframe belong, or is a time region to which first three symbols in a downlink subframe belong, or is a physical downlink control channel (PDCCH) region.
2. The method according to claim 1 , wherein the information carried in the second information field indicates the time-frequency domain resource occupied by the downlink control channel, and the information carried in the second information field comprises:
control channel elements (CCEs) occupied by the downlink control channel which carries downlink control information (DCI) in a transmission time period, wherein the transmission time period is shorter than or equal to 0.5 ms (milliseconds).
3. The method according to claim 1 , wherein the first time-frequency domain resource is a time-frequency domain resource in a transmission time period that is shorter than or equal to 0.5 ms (milliseconds).
4. A method for detecting control information, the method comprising:
determining, by a user terminal, at least one information field comprised in first control information based on a first time-frequency domain resource for detecting the first control information;
determining, by the user terminal, a quantity of bits of the first control information based on the at least one information field;
detecting, by the user terminal, the first control information on the first time-frequency domain resource based on the quantity of bits of the first control information; and
receiving, by the user terminal, the first control information after detecting the first control information;
wherein the first time-frequency domain resource is a time-frequency domain resource beyond a first time region;
wherein the at least one information field comprises a second information field;
wherein information carried in the second information field indicates:
a time-frequency domain resource not occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink data channel; and
wherein the first time region is a time region to which first two symbols in a downlink subframe belong, or is a time region to which first three symbols in a downlink subframe belong, or is a physical downlink control channel (PDCCH) region.
5. The method according to claim 4 , wherein the information carried in the second information field indicates the time-frequency domain resource occupied by the downlink control channel, and the information carried in the second information field comprises:
control channel elements (CCEs) occupied by the downlink control channel which carries downlink control information (DCI) in a transmission time period, wherein the transmission time period is shorter than or equal to 0.5 ms (milliseconds).
6. The method according to claim 4 , wherein the first time-frequency domain resource is a time-frequency domain resource in a transmission time period that is shorter than or equal to 0.5 ms (milliseconds).
7. A network device, comprising:
a processor, configured to:
determine, based on a first time-frequency domain resource for sending first control information, at least one information field comprised in the first control information; and
determine a quantity of bits of the first control information based on the at least one information field; and
a sending circuit, configured to send the first control information to a user terminal on the first time-frequency domain resource based on the quantity of bits of the first control information;
wherein the first time-frequency domain resource is a time-frequency domain resource beyond a first time region;
wherein the at least one information field comprises a second information field;
wherein information carried in the second information field indicates:
a time-frequency domain resource not occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink control channel; or
a time-frequency domain resource occupied by a downlink data channel, and
wherein the first time region is a time region to which first two symbols in a downlink subframe belong, or is a time region to which first three symbols in a downlink subframe belong, or is a physical downlink control channel (PDCCH) region.
8. The network device according to claim 7 , wherein the information carried in the second information field indicates the time-frequency domain resource occupied by the downlink control channel, and the information carried in the second information field comprises:
control channel elements (CCEs) occupied by the downlink control channel which carries downlink control information (DCI) in a transmission time period, wherein the transmission time period is shorter than or equal to 0.5 ms (milliseconds).
9. The network device according to claim 7 , wherein the first time-frequency domain resource is a time-frequency domain resource in a transmission time period that is shorter than or equal to 0.5 ms (milliseconds).
10. A user terminal, comprising:
a processor, configured to:
determine, based on a first time-frequency domain resource for detecting first control information, at least one information field comprised in the first control information; wherein
determine a quantity of bits of the first control information based on the at least one information field;
detect the first control information on the first time-frequency domain resource based on the quantity of bits of the first control information; and
a receiving circuit, configured to receive the first control information after the processor detects the first control information;
wherein the first time-frequency domain resource is a time-frequency domain resource beyond a first time region;
wherein the at least one information field comprises a second information field;
wherein information carried in the second information field indicates:
a time-frequency domain resource not occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink control channel, or
a time-frequency domain resource occupied by a downlink data channel; and
wherein the first time region is a time region to which first two symbols in a downlink subframe belong, or is a time region to which first three symbols in a downlink subframe belong, or is a physical downlink control channel (PDCCH) region.
11. The user terminal according to claim 10 , wherein the information carried in the second information field indicates the time-frequency domain resource occupied by the downlink control channel, and the information carried in the second information field comprises:
control channel elements (CCEs) occupied by the downlink control channel which carries downlink control information (DCI) in a transmission time period, wherein the transmission time period is shorter than or equal to 0.5 ms (milliseconds).
12. The user terminal according to claim 10 , wherein the first time-frequency domain resource is a time-frequency domain resource in a transmission time period that is shorter than or equal to 0.5 ms (milliseconds).