Method and apparatus for configuring search space of a downlink control channel
A method for configuring a search space of a downlink control channel is provided. The method includes determining the parameters for Enhanced Physical Downlink Control Channel (E-PDCCH) candidates of each aggregate level according to the number of Resource Elements (RE) in a subframe and/or the number of bits of Downlink Control Information (DCI) formats, when the parameters for E-PDCCH candidates of E-PDCCH search space is configured, determining, by a User Equipment (UE), the parameters for E-PDCCH candidates according to a current downlink subframe and a detected DCI format, and detecting blindly, by the UE, the E-PDCCH candidates in the E-PDCCH search space corresponding to the parameters for E-PDCCH candidates. The present invention also provides a UE and a base station. Application of the present invention can improve the flexibility of the base station scheduling, and reduce the possibility that the E-PDCCHs of different UEs block each other.
1. A method for a wireless communication, the method comprising:
determining, by a user equipment (UE), an amount of resource elements (REs) in a physical resource block (PRB) pair and a downlink control information (DCI) format for an enhanced physical downlink control channel (E-PDCCH);
determining, by the UE, an amount of E-PDCCH candidates of each of aggregation levels based on the determined amount of REs in the PRB pair and the determined DCI format; and
monitoring, by the UE, the E-PDCCH candidates in the E-PDCCH search space based on the determined amount of E-PDCCH candidates.
2. The method of claim 1 , wherein the amount of REs in the PRB pair is calculated based on an amount of REs for a common reference signal (CRS) and a channel state information reference signal (CSI-RS) in the PRB pair configured for the E-PDCCH.
3. The method of claim 1 , wherein a number of bits of each of DCI formats is different from each other.
4. The method of claim 1 , further comprising:
receiving information indicating whether the UE monitors the E-PDCCH via a higher layer signaling.
5. The method of claim 1 , wherein the DCI format for the E-PDCCH is configured by a base station.
6. A user equipment (UE) comprising:
a controller configured:
to determine an amount of resource elements (REs) in a physical resource block (PRB) pair and a downlink control information (DCI) format for an enhanced physical downlink control channel (E-PDCCH),
to determine an amount of E-PDCCH candidates of each of aggregation levels based on the determined amount of REs and the determined DCI format, and
to monitor the E-PDCCH candidates in the E-PDCCH search space based on the determined amount of E-PDCCH candidates.
7. The UE of claim 6 , wherein the amount of REs in the PRB pair is calculated based on an amount of REs for a common reference signal (CRS) and a channel state information reference signal (CSI-RS) in the PRB pair configured for the E-PDCCH.
8. The UE of claim 6 , wherein a number of bits of each of DCI formats is different from each other.
9. The UE of claim 6 , wherein the controller is further configured to control to receive information indicating whether the UE monitors the E-PDCCH via a higher layer signaling.
10. The UE of claim 6 , wherein the DCI format for the E-PDCCH is configured by the base station.
11. A base station (BS) comprising:
a controller configured:
to determine an amount of resource elements (REs) in a physical resource block (PRB) pair and a downlink control information (DCI) format for an enhanced physical downlink control channel (E-PDCCH),
to determine an amount of E-PDCCH candidates of each of aggregation levels based on the determined amount of REs in the PRB pair and the determined DCI format,
to select an E-PDCCH candidate in an E-PDCCH search space based on the amount of E-PDCCH candidates, and
to transmit the E-PDCCH using resources corresponding to the selected E-PDCCH candidate.
12. The BS of claim 11 , wherein the amount of REs in the PRB pair is calculated based on an amount of REs for a common reference signal (CRS) and a channel state information reference signal (CSI-RS) in the PRB pair configured for the E-PDCCH.
13. The BS of claim 11 , wherein a number of bits of each of the DCI formats is different from each other.
14. The BS of claim 11 , wherein the controller is further configured to control to transmit information indicating whether the UE monitors the E-PDCCH via a higher layer signaling.
15. The BS of claim 11 , wherein the controller is further configured to control to configure the DCI format for the E-PDCCH.
16. A method for a wireless communication, the method comprising:
determining, by a base station, an amount of resource elements (REs) in a physical resource block (PRB) pair and a downlink control information (DCI) format for an enhanced physical downlink control channel (E-PDCCH);
determining, by the base station, an amount of E-PDCCH candidates of each of aggregation levels based on the determined amount of REs in the PRB pair and the determined DCI format;
selecting, by the base station, an E-PDCCH candidate in an E-PDCCH search space based on the amount of E-PDCCH candidates; and
transmitting, by the base station, the E-PDCCH using resources corresponding to the selected E-PDCCH candidate.
17. The method of claim 16 , wherein the amount of the REs in the PRB pair is calculated based on an amount of REs for a common reference signal (CRS) and a channel state information reference signal (CSI-RS) in the PRB pair configured for the E-PDCCH.
18. The method of claim 16 , wherein a number of bits of each of the DCI formats is different from each other.
19. The method of claim 16 , further comprising:
transmitting, by the base station, information indicating whether the UE monitors the E-PDCCH in the subframe via a higher layer signaling.
20. The method of claim 16 , further comprising:
configuring, by the base station, the DCI format for the E-PDCCH.