Methods and apparatuses for receiving and sending control channel
Embodiments of the present invention disclose methods and apparatuses for receiving and sending a control channel, and are applicable to the field of communications technologies. In the embodiments of the present invention, a base station carries scheduling information of a user equipment of an R11 system in both the PDCCH region and the E-PDCCH region of a downlink subframe. In this way, the user equipment needs to detect the control channel within the PDCCH region and the E-PDCCH region, so that resources of the two regions are available to the user equipment of the R11 system. Moreover, the user equipment detects only the control channel of the first type in the PDCCH region, and detects control channels of the other type in the E-PDCCH region. The method in the embodiments of the present invention does not increase the number of control channel detections.
1. A method for receiving a control channel, comprising:
detecting, by a terminal device, a control channel of a first type within a physical downlink control channel (PDCCH) region in a downlink subframe in a carrier; and
detecting, by the terminal device, a control channel of a second type within an evolved physical downlink control channel (E-PDCCH) region in the downlink subframe containing the PDCCH region, wherein the control channel of the first type is different from the control channel of the second type;
wherein the control channel of the first type is a control channel of a common search space and the control channel of the first type is not a control channel of a search space specific to the terminal device, and the control channel of the second type is a control channel of the search space specific to the terminal device and the control channel of the second type is not a control channel of the common search space, and wherein the common search space is used to transmit control information common for terminal devices in a cell, and the search space specific to the terminal device is used to transmit scheduling indication signaling of uplink or downlink data transmission of the terminal device.
2. The method according to claim 1 , wherein: a sum of the number of detections of the control channel of the first type in the PDCCH region and the number of detections of the control channel of the second type in the E-PDCCH region is not greater than a preset number of detections.
3. The method according to claim 1 , wherein:
at least one aggregation format covered by the control channel of the first type is different from aggregation formats covered by the control channel of the second type.
4. The method according to claim 3 , wherein
at least one of an aggregation level and/or at least one of a format of control channel elements varies between the control channel of the first type and the control channel of the second type.
5. The method according to claim 3 , wherein: a size of resources of the aggregation formats covered by the control channel of the second type is not smaller than a size of resources of the aggregation formats covered by the control channel of the first type.
6. The method according to claim 1 , wherein
a downlink control information format (DCI format) transmitted over the control channel of the first type is different from a DCI format transmitted over the control channel of the second type.
7. The method according to claim 6 , wherein
the DCI format transmitted over the control channel of the first type is an uplink scheduling (UL_grant) control signaling format, and the DCI format transmitted over the control channel of the second type is a downlink scheduling (DL_grant) control signaling format; or
the DCI format transmitted over the control channel of the first type is a DL_grant control signaling format, and the DCI format transmitted over the control channel of the second type is an UL_grant control signaling format.
8. The method according to claim 6 , wherein:
a size of the DCI format transmitted over the control channel of the first type is the same as a size of the DCI format transmitted over the control channel of the second type.
9. The method according to claim 1 , wherein: before detecting the control channel in the PDCCH region and the E-PDCCH region, the method further comprises:
receiving, by the terminal device, configuration information from a base station, wherein the configuration information indicates the control channel of the second type.
10. The method according to claim 9 , wherein: the configuration information is carried on signaling specific for the terminal device.
11. An apparatus, comprising
a non-transitory computer readable storage medium including executable instructions; and
a processor;
wherein the executable instructions, when executed by the processor, cause the processor to:
detect a control channel of a first type within a physical downlink control channel (PDCCH) region in a downlink subframe in a carrier; and
detect a control channel of a second type within an evolved physical downlink control channel (E-PDCCH) region in the downlink subframe containing the PDCCH region,
wherein the control channel of the first type is different from the control channel of the second type;
wherein the control channel of the first type is a control channel of a common search space and the control channel of the first type is not a control channel of a search space specific to the terminal device, and the control channel of the second type is a control channel of the search space specific to the terminal device and the control channel of the second type is not a control channel of the common search space, and wherein the common search space is used to transmit control information common for terminal devices in a cell, and the search space specific to the terminal device is used to transmit scheduling indication signaling of uplink or downlink data transmission of the terminal device.
12. The apparatus according to claim 11 , wherein:
at least one aggregation format covered by the control channel of the first type is different from aggregation formats covered by the control channel of the second type.
13. The apparatus according to claim 11 , wherein a downlink control information format (DCI format) transmitted over the control channel of the first type is different from a DCI format transmitted over the control channel of the second type, wherein
the DCI format transmitted over the control channel of the first type is an uplink scheduling (UL_grant) control signaling format, and the DCI format transmitted over the control channel of the second type is a downlink scheduling (DL_grant) control signaling format; or
the DCI format transmitted over the control channel of the first type is a DL_grant control signaling format, and the DCI format transmitted over the control channel of the second type is an UL_grant control signaling format.
14. A terminal device, comprising:
a transceiver, and a processor communicatively connected with the transceiver, wherein
the processor is configured to:
detect a control channel of a first type within a physical downlink control channel (PDCCH) region in a downlink subframe in a carrier; and
detect a control channel of a second type within an evolved physical downlink control channel (E-PDCCH) region in the downlink subframe containing the PDCCH region,
wherein the control channel of the first type is different from the control channel of the second type;
wherein the control channel of the first type is a control channel of a common search space and the control channel of the first type is not a control channel of a search space specific to the terminal device, and the control channel of the second type is a control channel of the search space specific to the terminal device and the control channel of the second type is not a control channel of the common search space, and wherein the common search space is used to transmit control information common for terminal devices in a cell, and the search space specific to the terminal device is used to transmit scheduling indication signaling of uplink or downlink data transmission of the terminal device.
15. The terminal device according to claim 14 , wherein:
at least one aggregation format in the aggregation formats covered by the control channel of the first type is different from aggregation formats covered by the control channel of the second type.
16. The terminal device according to claim 15 , wherein
at least one of an aggregation level and/or at least one of a format of control channel elements varies between the control channel of the first type and the control channel of the second type.
17. The terminal device according to claim 15 , wherein: a size of resources of the aggregation formats covered by the control channel of the second type is not smaller than a size of resources of the aggregation formats covered by the control channel of the first type.
18. The terminal device according to claim 14 , wherein
a downlink control information format (DCI format) transmitted over the control channel of the first type is different from a DCI format transmitted over the control channel of the second type.
19. The terminal device according to claim 18 , wherein
the DCI format transmitted over the control channel of the first type is an uplink scheduling (UL_grant) control signaling format, and the DCI format transmitted over the control channel of the second type is a downlink scheduling (DL_grant) control signaling format; or
the DCI format transmitted over the control channel of the first type is a DL_grant control signaling format, and the DCI format transmitted over the control channel of the second type is an UL_grant control signaling format.
20. The terminal device according to claim 18 , wherein:
a size of the DCI format transmitted over the control channel of the first type is the same as a size of the DCI format transmitted over the control channel of the second type.
21. The terminal device according to claim 14 , wherein:
the transceiver is configured to receive configuration information from a base station, wherein the configuration information indicates the control channel of the second type.
22. The terminal device according to claim 21 , wherein: the configuration information is carried on signaling specific for the terminal device.
23. The terminal device according to claim 14 , wherein: a sum of the number of detections of the control channel of the first type in the PDCCH region and the number of detections of the control channel of the second type in the E-PDCCH region is not greater than a preset number of detections.