Detecting a control channel in a search space
地域：
Guangdong
摘要
This application provides a control channel detection method, apparatus, and device. The method includes: A terminal device determines that resources of at least two candidate control channels overlap, where any two of the at least two candidate control channels are located in different search spaces; and the terminal device detects only at least one first candidate control channel in the at least two candidate control channels. This improves control channel detection reliability.
說明書
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This application is a continuation of International Application No. PCT/CN2019/108695, filed on Sep. 27, 2019, which claims priority to Chinese Patent Application No. 201811142738.6, filed on Sep. 28, 2018. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.
This application relates to the field of communications technologies, and in particular, to a control channel detection method, apparatus, and device.
In a wireless communication process, a base station may configure a plurality of search spaces for a terminal device, and each search space includes a plurality of candidate control channels. The terminal device may detect, in the plurality of search spaces, a downlink control channel sent by the base station.
Candidate control channels included in different search spaces configured by the base station for the terminal device may use a same resource (overlapping resource). For example, a candidate control channel 1 in a search space set 1 and a candidate control channel 4 in a search space set 2 use a same resource. After detecting a control channel on the overlapping resource, the terminal device cannot determine a search space to which the control channel belongs. Because different search spaces correspond to different control channel formats, the terminal device cannot determine a format of the control channel, and consequently cannot correctly parse the received control channel. This causes relatively low control channel detection reliability.
權(quán)利要求
What is claimed is:1. A control channel detection method, comprising:determining, by a terminal device, that resources of a first candidate control channel and a second candidate control channel overlap, wherein the first candidate control channel and the second candidate control channel are located in different search spaces, a type of the search space in which the first candidate control channel is located is common search space, and a type of the search space in which the second candidate control channel is located is specific search space; and detecting, by the terminal device, only the first candidate control channel. 2. The method according to claim 1 , whereindownlink control information (DCI) carried on the first candidate control channel and the second candidate control channel does not comprise a carrier indicator field, and the first candidate control channel and the second candidate control channel comprise downlink control information having a same format. 3. The method according to claim 1 whereineach of the first candidate control channel and the second candidate control channel comprises a candidate control channel in a second downlink control information format, and the second downlink control information format is a DCI format 0_0 or a DCI format 1_0. 4. The method according to claim 1 , whereinsearch spaces in which the first candidate control channel and the second candidate control channel are located are associated with a same control-resource set; and wherein the resources of the first candidate control channel and the second candidate control channel overlapping comprises the first candidate control channel and the second candidate control channel occupying at least one same control channel element (CCE). 5. The method according to claim 1 , wherein the first candidate control channel and the second candidate control channel meet at least one of the following conditions:the first candidate control channel and the second candidate control channel comprise a same start control channel element index; the first candidate control channel and the second candidate control channel have a same payload size; or cyclic redundancy codes (CRC) of the first candidate control channel and the second candidate control channel are scrambled by using a cell radio network temporary identifier (C-RNTI) or a configured scheduling radio network temporary identifier (CS-RNTI). 6. A control channel detection method, comprising:sending, by a network device, a second control channel, wherein the second control channel is a control channel in a first candidate control channel and a second candidate control channel, resources of the first candidate control channel and the second candidate control channel overlap, and the first candidate control channel and the second candidate control channel are located in different search spaces, a type of the search space in which the first candidate control channel is located is common search space, and a type of the search space in which the second candidate control channel is located is specific search space; and sending, by the network device, a first data channel, wherein the first data channel is scheduled through the second control channel. 7. The method according to claim 6 , wherein the method further comprises:skipping sending, by the network device, a candidate control channel other than the first candidate control channel in the first candidate control channel and the second candidate control channel. 8. The method according to claim 7 , whereindownlink control information (DCI) carried on each of the first candidate control channel and the second candidate control channel does not comprise a carrier indicator field, and the first candidate control channel and the second candidate control channel comprise a same downlink control information format. 9. The method according to claim 8 , whereineach of the first candidate control channel and the second candidate control channel comprises a candidate control channel in a second downlink control information format, and the second downlink control information format is a DCI format 0_0 or a DCI format 1_0. 10. The method according to claim 7 , whereinsearch spaces in which the first candidate control channel and the second candidate control channel are located are associated with a same control-resource set; and wherein the resources of the first candidate control channel and the second candidate control channel overlapping comprises the first candidate control channel and the second candidate control channel occupying at least one same control channel element (CCE). 11. An apparatus, comprising:one or more processors, and a memory configure to store program instructions; wherein, when executed by the one or more processors, the instructions cause the apparatus to: determine that resources of a first candidate control channel a second candidate control channel overlap, wherein the first candidate control channel and the second candidate control channel are located in different search spaces, a type of the search space in which the first candidate control channel is located is common search space, and a type of the search space in which the second candidate control channel is located is specific search space; and detect only the first candidate control channel. 12. The apparatus according to claim 11 , whereindownlink control information (DCI) carried on the first candidate control channel and the second candidate control channel does not comprise a carrier indicator field, and the first candidate control channel and the second candidate control channel comprise a same downlink control information format. 13. The apparatus according to claim 12 , whereineach of the first candidate control channel and the second candidate control channel comprises a candidate control channel in a second downlink control information format, and the second downlink control information format is a DCI format 0_0 or a DCI format 1_0. 14. The apparatus according to claim 11 , whereinsearch spaces in which the first candidate control channel and the second candidate control channel are located are associated with a same control-resource set; and wherein the resources of the first candidate control channel and the second candidate control channel overlapping comprises the first candidate control channel and the second candidate control channel occupying at least one same control channel element (CCE). 15. The apparatus according to claim 11 , wherein the first candidate control channel and the second candidate control channel meet at least one of the following conditions:the first candidate control channel and the second candidate control channel comprise a same start control channel element index; the first candidate control channel and the second candidate control channel have a same payload size; or cyclic redundancy codes (CRC) of the first candidate control channel and the second candidate control channel are scrambled by using a cell radio network temporary identifier (C-RNTI) or a configured scheduling radio network temporary identifier (CS-RNTI). 16. An apparatus, comprising:one or more processors, and a memory configure to store program instructions; wherein, when executed by the one or more processors, the instructions cause the apparatus to: send a second control channel, wherein the second control channel is a control channel in a first candidate control channel and a second candidate control channel, resources of the first candidate control channel and the second candidate control channel overlap, and the first candidate control channel and the second candidate control channel are located in different search spaces, a type of the search space in which the first candidate control channel is located is common search space, and a type of the search space in which the second candidate control channel is located is specific search space; and send a first data channel, wherein the first data channel is scheduled through the second control channel. 17. The apparatus according to claim 16 , wherein the instructions cause the apparatus further to:skip sending a candidate control channel other than the at least one first candidate control channel in the first candidate control channel and the second candidate control channel. 18. The apparatus according to claim 17 , whereindownlink control information (DCI) carried on each of the first candidate control channel and the second candidate control channel does not comprise a carrier indicator field, and the first candidate control channel and the second candidate control channel comprise a same downlink control information format. 19. The apparatus according to claim 18 , whereineach of the first candidate control channel and the second candidate control channel comprises a candidate control channel in a second downlink control information format, and the second downlink control information format is a DCI format 0_0 or a DCI format 1_0. 20. The apparatus according to claim 17 , whereinsearch spaces in which the first candidate control channel and the second candidate control channel are located are associated with a same control-resource set; and wherein the resources of the first candidate control channel and the second candidate control channel overlapping comprises the first candidate control channel and the second candidate control channel occupying at least one same control channel element (CCE).
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