Method and apparatus for allocating control channel candidates
The present application provides a method and an apparatus for allocating control channel candidates, which relate to the communications field, and can allocate control channel candidates at different aggregation levels to K ePDCCH sets and reduce complexity of blind detection performed by a UE. The method includes: determining K sets for transmitting a control channel, where each set in the K sets includes at least one physical resource block pair; and allocating control channel candidates at each aggregation level to at least one set in the K sets according to at least one of aggregation levels supported by the control channel to be transmitted, the number of control channel candidates corresponding to each aggregation level, the K sets for transmitting the control channel, and types of the sets.
1. A method for allocating control channel candidates, comprising:
determining, by a base station, K sets for transmitting a control channel, wherein each of the K sets comprises at least one physical resource block pair, and K is a positive integer greater than 0; and
allocating, by the base station, control channel candidates to at least one set of the K sets according to aggregation levels supported by the control channel, a quantity of control channel candidates corresponding to each aggregation level, the K sets for transmitting the control channel, and types of the K sets, wherein the types of the K sets comprise one or both of a localised transmission mode and a distributed transmission mode, and a quantity of sets of the localised transmission mode is K L , and a quantity of sets of the distributed transmission mode is K D , K L +K D =K, wherein K L and K D are integers greater than or equal to 0.
2. The method according to claim 1 , wherein the aggregation levels supported by the control channel comprise one or more of the following types:
aggregation levels supported by the localised transmission mode, aggregation levels supported by the distributed transmission mode, and aggregation levels supported by both the localised transmission mode and the distributed transmission mode.
3. The method according to claim 2 , wherein K L is a positive integer and K D =0, and the allocating of the control channel candidates, comprises:
allocating all control channel candidates at the aggregation levels supported by the localised transmission mode to at least one of the K L sets.
4. The method according to claim 2 , wherein K D is a positive integer and K L =0, and the allocating of the control channel candidates, comprises:
allocating all control channel candidates at the aggregation levels supported by the distributed transmission mode to at least one of the K D sets.
5. The method according to claim 2 , wherein both K L and K D are positive integers, and the allocating of the control channel candidates, comprises:
allocating all control channel candidates at the aggregation levels supported by both the localised transmission mode and the distributed transmission mode to at least one of the K L sets and at least one of the K D sets.
6. The method according to claim 5 , wherein the aggregation levels supported by both the localised transmission mode and the distributed transmission mode comprise a first aggregation level and a second aggregation level, and wherein:
at least one half of all control channel candidates at the first aggregation level supported by both the localised transmission mode and the distributed transmission mode are allocated to at least one of the K L sets; and
at least one half of all control channel candidates at the second aggregation level supported by both the localised transmission mode and the distributed transmission mode are allocated to at least one of the K D sets.
7. The method according to claim 6 , wherein:
when the aggregation levels supported by both the localised transmission mode and the distributed transmission mode comprise aggregation level 1, aggregation level 2, aggregation level 4, and aggregation level 8, the first aggregation level comprises aggregation level 1 and aggregation level 2, and the second aggregation level comprises aggregation level 4 and aggregation level 8; or
when the aggregation levels supported by both the localised transmission mode and the distributed transmission mode comprise aggregation level 2, aggregation level 4, aggregation level 8, and aggregation level 16, the first aggregation level comprises aggregation level 2 and aggregation level 4, and the second aggregation level comprises aggregation level 8 and aggregation level 16.
8. The method according to claim 5 , wherein at each aggregation level:
according to a ratio between quantities of sets used for the aggregation level in the K L or K D sets, quantities of control channel candidates allocated to the K L and K D sets are determined, at each aggregation level; or
according to a ratio between total quantities of physical resource blocks of sets used for the aggregation level in the K L and K D sets, quantities of control channel candidates allocated to the K L and K D sets are determined; or
according to a ratio of a quantity of physical resource blocks of each set used for the aggregation level in the K L or K D sets, a quantity of control channel candidates allocated to each set are determined.
9. The method according to claim 2 , wherein the allocating of the control channel candidates, comprises:
allocating all control channel candidates at an aggregation level supported by only the the localised transmission mode to at least one set of the K L sets; or
allocating all control channel candidates at an aggregation level supported by only the distributed transmission mode to at least one set of the K D sets.
10. The method according to claim 9 , wherein
a quantity of control channel candidates allocated to each of the at least one set of the K L or K D sets at the aggregation level is determined according to a quantity of sets used for the aggregation level in the K L or K D sets; or
a quantity of control channel candidates allocated to each of the at least one set of the K L or K D sets at the aggregation level is determined according to a ratio of a quantity of physical resource blocks of each set used for the aggregation level in the K L or K D sets.
11. The method according to claim 1 , wherein at each aggregation level:
when a quantity of control channel candidates configured for the K L sets is greater than 1 and K L is greater than 1, a quantity of control channel candidates in each set is determined according to a quantity of physical resource blocks comprised in each set that can support the aggregation level in the K L sets or a quantity of sets that can support the aggregation level in the K L sets, or
when a quantity of control channel candidates configured for the K D sets is greater than 1 and K D is greater than 1, a quantity of control channel candidates in each set is determined according to a quantity of physical resource blocks comprised in each set that can support the aggregation level in the K D sets or a quantity of sets that can support the aggregation level in the K D sets.
12. An apparatus for allocating control channel candidates, comprising a processor and a non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores a program, and when the program is executed by the processor, the following steps are performed:
determining K sets for transmitting a control channel, wherein each of the K sets comprises at least one physical resource block pair, and K is a positive integer greater than 0; and
allocating control channel candidates to at least one set of the K sets according to aggregation levels supported by the control channel, a quantity of control channel candidates corresponding to each aggregation level, the K sets for transmitting the control channel, and types of the K sets, wherein the types of the K sets comprise one or both of a localised transmission mode and a distributed transmission mode, and a quantity of sets of the localised transmission mode is K L , and a quantity of sets of the distributed transmission mode is K D , K L +K D =K, wherein K L and K D are integers greater than or equal to 0.
13. The apparatus according to claim 12 , wherein the aggregation levels supported by the control channel comprise one or more of the following types:
aggregation levels supported by the localised transmission mode, aggregation levels supported by the distributed transmission mode, and aggregation levels supported by both the localised transmission mode and the distributed transmission mode.
14. The apparatus according to claim 13 , wherein K L is a positive integer and K D =0, and the allocating of the control channel candidates, comprises:
allocating all control channel candidates at the aggregation levels supported by the localised transmission mode to at least one of the K L sets.
15. The apparatus according to claim 13 , wherein K D is a positive integer and K L =0, and the allocating of the control channel candidates, comprises:
allocating all control channel candidates at the aggregation levels supported by the distributed transmission mode to at least one of the K D sets.
16. The apparatus according to claim 13 , wherein both K L and K D are positive integers, and the allocating of the control channel candidates, comprises:
allocating all control channel candidates at the aggregation levels supported by both the localised transmission mode and the distributed transmission mode to at least one of the K L sets and at least one of the K D sets.
17. The apparatus according to claim 16 , wherein the aggregation levels supported by both the localised transmission mode and the distributed transmission mode comprise a first aggregation level and a second aggregation level, and wherein:
at least one half of all control channel candidates at the first aggregation level supported by both the localised transmission mode and the distributed transmission mode are allocated to at least one of the K L sets; and
at least one half of all control channel candidates at the second aggregation level supported by both the localised transmission mode and the distributed transmission mode are allocated to at least one of the K D sets.
18. The apparatus according to claim 17 , wherein:
when the aggregation levels supported by both the localised transmission mode and the distributed transmission mode comprise aggregation level 1, aggregation level 2, aggregation level 4, and aggregation level 8, the first aggregation level comprises aggregation level 1 and aggregation level 2, and the second aggregation level comprises aggregation level 4 and aggregation level 8; or
when the aggregation levels supported by both the localised transmission mode and the distributed transmission mode comprise aggregation level 2, aggregation level 4, aggregation level 8, and aggregation level 16, the first aggregation level comprises aggregation level 2 and aggregation level 4, and the second aggregation level comprises aggregation level 8 and aggregation level 16.
19. The apparatus according to claim 16 , wherein at each aggregation level:
according to a ratio between quantities of sets used for the aggregation level in the K L or K D sets, quantities of control channel candidates allocated to the K L and K D sets are determined, at each aggregation level; or
according to a ratio between total quantities of physical resource blocks of sets used for the aggregation level in the K L and K D sets, quantities of control channel candidates allocated to the K L and K D sets are determined; or
according to a ratio of a quantity of physical resource blocks of each set used for the aggregation level in the K L or K D sets, a quantity of control channel candidates allocated to each set are determined.
20. The apparatus according to claim 13 , wherein the allocating of the control channel candidates, comprises:
allocating all control channel candidates at an aggregation level supported by only the the localised transmission mode to at least one set of the K L sets; or
allocating all control channel candidates at an aggregation level supported by only the distributed transmission mode to at least one set of the K D sets.
21. The apparatus according to claim 20 , wherein
a quantity of control channel candidates allocated to each of the at least one set of the K L or K D sets at the aggregation level is determined according to a quantity of sets used for the aggregation level in the K L or K D sets; or
a quantity of control channel candidates allocated to each of the at least one set of the K L or K D sets at the aggregation level is determined according to a ratio of a quantity of physical resource blocks of each set used for the aggregation level in the K L or K D sets.
22. The apparatus according to claim 12 , wherein at each aggregation level:
when a quantity of control channel candidates configured for the K L sets is greater than 1 and K L is greater than 1, a quantity of control channel candidates in each set is determined according to a quantity of physical resource blocks comprised in each set that can support the aggregation level in the K L sets or a quantity of sets that can support the aggregation level in the K L sets, or
when a quantity of control channel candidates configured for the K D sets is greater than 1 and K D is greater than 1, a quantity of control channel candidates in each set is determined according to a quantity of physical resource blocks comprised in each set that can support the aggregation level in the K D sets or a quantity of sets that can support the aggregation level in the K D sets.
23. A non-transitory computer readable storage medium comprising instructions that, when executed by a processor, cause the processor to:
determining K sets for transmitting a control channel, wherein each of the K sets comprises at least one physical resource block pair, and K is a positive integer greater than 0; and
allocate control channel candidates to at least one set of the K sets according to aggregation levels supported by the control channel, a quantity of control channel candidates corresponding to each aggregation level, the K sets for transmitting the control channel, and types of the K sets, wherein the types of the K sets comprise one or both of a localised transmission mode and a distributed transmission mode, and a quantity of sets of the localised transmission mode is K L , and a quantity of sets of the distributed transmission mode is K D , K L +K D =K, wherein K L and K D are integers greater than or equal to 0.