Downlink control information sending method, downlink control information detection method, and device
A downlink control information sending method, a downlink control information detection method, and a device are provided. The method includes: receiving, by a terminal device, first signaling, where the first signaling includes configuration information of search space; determining, by the terminal device based on the configuration information, a frequency domain resource or a CCE resource occupied by the search space; and detecting, by the terminal device, downlink control information in the search space. A network device may configure the search space to occupy any frequency domain resource or CCE resource. The terminal device determines, based on the first signaling, the search space configured by the network device, and obtains the downlink control information in a timely manner. This effectively improves data transmission efficiency, and in particular, resolves a problem that downlink control information of duration less than 1 ms cannot be obtained in a timely manner.
1. A downlink control information detection method comprising:
receiving, by a terminal device, first signaling comprising configuration information of search space located within a control channel area;
determining, by the terminal device based on the configuration information of the search space, a frequency domain resource or a control channel element (CCE) resource occupied by the search space;
receiving, by the terminal device, third signaling indicating that the control channel area occupies N short resource blocks,
wherein N is evenly divided by 3, and
wherein each short resource block occupies 12 subcarriers in a frequency domain and one or two symbols in a time domain; and
detecting, by the terminal device, downlink control information in the search space.
2. The method according to claim 1 , wherein the configuration information of the search space indicates an aggregation level and a search space start point identifier.
3. The method according to claim 1 , wherein before determining the control channel area, the method further comprises:
receiving, by the terminal device, second signaling indicating a resource occupied by the control channel area,
wherein the second signaling comprises N CCEG information fields, an i th information field in the N CCEG information fields indicates that H CCEs, in a control channel element group (CCEG), i−1 of the CCEs are configured for the control channel area,
wherein i is a positive integer not greater than N CCEG and the i−1 CCEs of the CCEG consist of G CCEs, and
wherein G is a positive integer, and H is equal to G.
4. A downlink control information sending method comprising:
determining, by a network device, a control channel area, wherein search space is located in the control channel area;
sending, by the network device, a first signaling comprising configuration information of the search space located within the control channel area,
wherein the configuration information indicates a frequency domain resource or a control channel element (CCE) resource occupied by the search space; and
sending, by the network device, third signaling indicating that the control channel area occupies N short resource blocks,
wherein N can be exactly divided by 3, and
wherein each short resource block occupies 12 subcarriers in frequency domain and occupies one or two symbols in time domain; and
sending, by the network device, downlink control information in the search space.
5. The method according to claim 4 , wherein the configuration information of the search space indicates an aggregation level and a search space start point identifier.
6. The method according to claim 4 , further comprising:
sending, by the network device, second signaling indicating a resource occupied by the control channel area,
wherein the second signaling comprises N CCEG information fields, an i th information field in the N CCEG information fields indicates that H CCEs, in a control channel element group (CCEG), i−1 of the CCEs are configured for the control channel area,
wherein i is a positive integer not greater than N CCEG the i−1 CCEs of the CCEG consist of G CCEs, and
wherein G is a positive integer, and H is equal to G.
7. A terminal device comprising:
a processor;
a receiver configured to cooperate with the processor to receive first signaling comprising configuration information of search space located within a control channel area; and
the processor configured to
determine, based on the configuration information of the search space, a frequency domain resource or a control channel element (CCE) resource occupied by the search space; and
receiving third signaling indicating that the control channel area occupies N short resource blocks,
wherein N is evenly divided by 3, and
wherein each short resource block occupies 12 subcarriers in a frequency domain and one or two symbols in a time domain; and
detecting downlink control information in the search space.
8. The terminal device according to claim 7 , wherein the configuration information of the search space indicates an aggregation level and a search space start point identifier.
9. The terminal device according to claim 7 , wherein the receiver is further configured to cooperate with the processor to receive second signaling indicating a resource occupied by the control channel area,
wherein the second signaling comprises N CCEG information fields, an i th information field in the N CCEG information fields indicates that H CCEs, in a control channel element group (CCEG), i−1 of the CCEs are configured for the control channel area,
wherein i is a positive integer not greater than N CCEG and the i−1 CCEs of the CCEG consist of G CCEs, and
wherein G is a positive integer, and H is equal to G.
10. A network device comprising:
a processor;
a transmitter; and
the processor configured to determine a control channel area, wherein search space is located in the control channel area, and the processor is further configured to cooperate with the transmitter to
send first signaling comprising configuration information of the search space located within the control channel area,
wherein the configuration information indicates a frequency domain resource or a control channel element (CCE) resource occupied by the search space;
send third signaling indicating that the control channel area occupies N short resource blocks,
wherein N can be exactly divided by 3, and
wherein each short resource block occupies 12 subcarriers in frequency domain and occupies one or two symbols in time domain; and
send downlink control information in the search space.
11. The network device according to claim 10 , wherein the configuration information of the search space indicates an aggregation level and a search space start point identifier.
12. The network device according to claim 10 , wherein the processor is further configured to cooperate with the transmitter to
send second signaling indicating a resource occupied by the control channel area,
wherein the second signaling comprises N CCEG information CCEG fields, an i th information field in the N CCEG information fields indicates that H CCEs, in a control channel element group (CCEG), i−1 of the CCEs are configured for the control channel area,
wherein i is a positive integer not greater than N CCEG and the i−1 CCEs of the CCEG consist of G CCEs, and
wherein G is a positive integer, and H is equal to G.