Method for downlink control channel design
Embodiments of this disclosure improve the reliability of blind decoding when beamforming is used by having a user equipment (UE) receive a single downlink control information (DCI) message with different transmission and/or reception parameters. In some embodiments, a UE receives more than one set of configuration parameters, where any two sets of configuration parameters out of the more than one set of configuration parameters have at least one different parameter. The UE may receive two sets of configuration parameters each having a different transmission modes, but the same search space type. Additional examples are also provided.
1. A method comprising:
transmitting, by an apparatus via a single radio resource control (RRC) message, first configuration parameters and second configuration parameters,
wherein the first configuration parameters and the second configuration parameters each comprise at least one of a search space type, one or more aggregation levels, or a candidate number;
transmitting, by the apparatus, a first downlink control information (DCI) in a first physical downlink control channel (PDCCH) search space in accordance with the first configuration parameters; and
transmitting, by the apparatus, a second DCI in a second PDCCH search space in accordance with the second configuration parameters, the first PDCCH search space and the second PDCCH search space being different PDCCH search spaces associated with different control resource sets, wherein the first DCI and the second DCI are associated with a same UE identifier (ID) or a same radio network temporary ID (RNTI), and wherein the first DCI and the second DCI are different instances of a single DCI.
2. The method of claim 1 , wherein a first PDCCH carrying the first DCI and a second PDCCH carrying the second DCI follow time division multiplexing or frequency division multiplexing.
3. The method of claim 1 , wherein the single RRC message comprises a linkage between the first configuration parameters and the second configuration parameters.
4. The method of claim 1 , wherein search space types of the first PDCCH search space and the second PDCCH search space are one of a common search space (CSS) type or a UE-specific search space (USS) type.
5. The method of claim 4 , wherein the search space types of the first PDCCH search space and the second PDCCH search space are the same.
6. The method of claim 1 , wherein the candidate number is a per-aggregation-level candidate number.
7. A method comprising:
receiving, by an apparatus via a single radio resource control (RRC) message, first configuration parameters and second configuration parameters,
wherein the first configuration parameters and the second configuration parameters each comprise at least one of a search space type, one or more aggregation levels, or a candidate number;
receiving, by the apparatus, a first downlink control information (DCI) in a first physical downlink control channel (PDCCH) search space in accordance with the first configuration parameters; and
receiving, by the apparatus, a second DCI in a second PDCCH search space in accordance with the second configuration parameters, the first PDCCH search space and the second PDCCH search space being different PDCCH search spaces associated with different control resource sets, wherein the first DCI and the second DCI are associated with a same UE identifier (ID) or a same radio network temporary ID (RNTI), and wherein the first DCI and the second DCI are different instances of a single DCI.
8. The method of claim 7 , wherein a first PDCCH carrying the first DCI and a second PDCCH carrying the second DCI follow time division multiplexing or frequency division multiplexing.
9. The method of claim 7 , wherein the single RRC message comprises a linkage between the first configuration parameters and the second configuration parameters.
10. The method of claim 7 , wherein search space types of the first PDCCH search space and the second PDCCH search space are one of a common search space (CSS) type or a UE-specific search space (USS) type.
11. An apparatus comprising:
at least one processor coupled with a non-transitory computer-readable storage medium storing instructions that, when executed by the at least one processor, cause the apparatus to perform operations including:
transmitting via a single radio resource control (RRC) message, first configuration parameters and second configuration parameters,
wherein the first configuration parameters and the second configuration parameters each comprise at least one of a search space type, one or more aggregation levels, or a candidate number;
transmitting a first downlink control information (DCI) in a first physical downlink control channel (PDCCH) search space in accordance with the first configuration parameters; and
transmitting a second DCI in a second PDCCH search space in accordance with the second configuration parameters, the first PDCCH search space and the second PDCCH search space being different PDCCH search spaces associated with different control resource sets,
wherein the first DCI and the second DCI are associated with a same UE identifier (ID) or a same radio network temporary ID (RNTI), and wherein the first DCI and the second DCI are different instances of a single DCI.
12. The apparatus of claim 11 , wherein the UE ID comprises a radio network temporary identifier (RNTI).
13. The apparatus of claim 11 , wherein the first PDCCH search space and the second PDCCH search space overlap in the time domain.
14. The apparatus of claim 11 , wherein a first PDCCH carrying the first DCI and a second PDCCH carrying the second DCI follow time division multiplexing or frequency division multiplexing.
15. The apparatus of claim 11 , wherein the single RRC message comprises a linkage between the first configuration parameters and the second configuration parameters.
16. An apparatus comprising:
at least one processor coupled with a non-transitory computer-readable storage medium storing instructions that, when executed by the at least one processor, cause the apparatus to perform operations including:
receiving via a single radio resource control (RRC) message, first configuration parameters and second configuration parameters,
wherein the first configuration parameters and the second configuration parameters each comprise at least one of a search space type, one or more aggregation levels, or a candidate number;
receiving a first downlink control information (DCI) in a first physical downlink control channel (PDCCH) search space in accordance with the first configuration parameters; and
receiving a second DCI in a second PDCCH search space in accordance with the second configuration parameters, the first PDCCH search space and the second PDCCH search space being different PDCCH search spaces associated with different control resource sets, wherein the first DCI and the second DCI are associated with a same UE identifier (ID) or a same radio network temporary ID (RNTI), and wherein the first DCI and the second DCI are different instances of a single DCI.
17. The apparatus of claim 16 , wherein the UE ID comprises a radio network temporary identifier (RNTI).
18. The apparatus of claim 16 , wherein the first PDCCH search space and the second PDCCH search space overlap in the time domain.
19. The apparatus of claim 16 , wherein a first PDCCH carrying the first DCI and a second PDCCH carrying the second DCI follow time division multiplexing or frequency division multiplexing.
20. The apparatus of claim 16 , wherein the single RRC message comprises a linkage between the first configuration parameters and the second configuration parameters.
21. The apparatus of claim 16 , wherein search space types of the first PDCCH search space and the second PDCCH search space are one of a common search space (CSS) type or a UE-specific search space (USS) type.
22. The apparatus of claim 21 , wherein the search space types of the first PDCCH search space and the second PDCCH search space are the same.
23. The apparatus of claim 16 , wherein the candidate number is a per-aggregation-level candidate number.