Method and apparatus for transceiving a downlink control channel in a wireless communication system
The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transceiving a downlink control channel. According to one embodiment of the present invention, method in which a base station transmits downlink control information in a wireless communication system comprises: a step for determining an allocatable resource region for an enhanced physical downlink control channel (E-PDCCH) of a local allocation system; a step for allocating an E-PDCCH to the determined allocatable resource region for the E-PDCCH; and a step for transmitting the downlink control information on the allocated E-PDCCH. The allocatable resource region for the E-PDCCH can be set as a group of partial resource regions in each of a plurality of partitions when a downlink system bandwidth contains said plurality of partitions.
1. A method for an evolved Node B (eNB) transmitting downlink control information in a wireless communication system, the method comprising:
determining a localized enhanced physical downlink control channel (E-PDCCH) allocatable resource region;
allocating a first E-PDCCH of a first user equipment (UE) to a first resource region included in the determined localized E-PDCCH allocatable resource region; and
transmitting the downlink control information to the first UE on the first E-PDCCH,
wherein the determined localized E-PDCCH allocatable resource region is set as a group of partial resource regions in corresponding partitions when a downlink system bandwidth includes a plurality of partitions,
wherein the downlink control information includes information indicating that a physical downlink shared channel (PDSCH) of the first UE is allocated to a second resource region in the determined localized E-PDCCH allocatable resource region and information indicating whether a second E-PDCCH of a second UE instead of the PDSCH of the first UE is present in the second resource region,
wherein an aggregation level for the first E-PDCCH is set higher than 4 when the first E-PDCCH is allocated according to distributed allocation, and
wherein the aggregation level for the first E-PDCCH is set equal to or lower than 4 when the first E-PDCCH is allocated according to localized allocation.
2. The method according to claim 1 , wherein the group of partial resource regions is determined according to predetermined priority of the plurality of partitions.
3. The method according to claim 2 , wherein the predetermined priority is set according to channel quality of the plurality of partitions.
4. The method according to claim 3 , wherein priority of the plurality of partitions is assigned according to channel quality.
5. The method according to claim 1 , wherein:
the plurality of partitions corresponds to a plurality of subbands; and
at least one of the plurality of subbands includes a plurality of resource blocks.
6. The method according to claim 5 , wherein the group of partial resource regions includes resource blocks having lowest indexes in the corresponding plurality of subbands.
7. The method according to claim 6 , wherein each of a plurality of resource blocks belonging to the localized E-PDCCH allocatable resource region includes a plurality of enhanced-control channel elements (E-CCEs).
8. The method according to claim 5 , wherein the localized E-PDCCH allocatable resource region is set to include enhanced-control channel elements (E-CCEs) belonging to a subband having high channel quality.
9. The method according to claim 1 , wherein configuration information related to at least the plurality of partitions or the group of partial resource regions is provided to an entity receiving the first E-PDCCH via higher layer signaling.
10. The method according to claim 1 , wherein the first E-PDCCH is located on orthogonal frequency division multiplex (OFDM) symbols other than a first four OFDM symbols in a downlink subframe.
11. A method for a first user equipment (UE) receiving downlink control information in a wireless communication system, the method comprising:
determining a localized enhanced physical downlink control channel (E-PDCCH) allocatable resource region;
attempting to decode a first E-PDCCH of the first UE in a first resource region included in the determined localized E-PDCCH allocatable resource region; and
receiving the downlink control information transmitted from an eNB (e Node-B) on the first E-PDCCH when the first E-PDCCH has been successfully decoded,
wherein the determined localized E-PDCCH allocatable resource region is set as a group of partial resource regions in corresponding partitions when a downlink system bandwidth includes a plurality of partitions,
wherein the downlink control information includes information indicating that a physical downlink shared channel (PDSCH) of the first UE is allocated to a second resource region in the determined localized E-PDCCH allocatable resource region and information indicating whether a second E-PDCCH of a second UE instead of the PDSCH of the first UE is present in the second resource region,
wherein an aggregation level for the first E-PDCCH is set higher than 4 when the first E-PDCCH is allocated according to distributed allocation, and
wherein the aggregation level for the first E-PDCCH is set equal to or lower than 4 when the first E-PDCCH is allocated according to localized allocation.
12. An evolved Node B (eNB) transmitting downlink control information in a wireless communication system, the eNB comprising:
a reception module configured to receive information;
a transmission module configured to transmit information; and
a processor configured to:
determine a localized E-PDCCH allocatable resource region;
allocate a first E-PDCCH of a first user equipment (UE) to a first resource region included in the determined localized E-PDCCH allocatable resource region; and
control the transmission module to transmit the downlink control information to the first UE on the first E-PDCCH,
wherein the determined localized E-PDCCH allocatable resource region is set as a group of partial resource regions in corresponding partitions when a downlink system bandwidth includes a plurality of partitions,
wherein the downlink control information includes information indicating that a physical downlink shared channel (PDSCH) of the first UE is allocated to a second resource region in the determined localized E-PDCCH allocatable resource region and information indicating whether a second E-PDCCH of a second UE instead of the PDSCH of the first UE is present in the second resource region,
wherein an aggregation level for the first E-PDCCH is set higher than 4 when the first E-PDCCH is allocated according to distributed allocation, and
wherein the aggregation level for the first E-PDCCH is set equal to or lower than 4 when the first E-PDCCH is allocated according to localized allocation.
13. A first user equipment (UE) receiving downlink control information in a wireless communication system, the first UE comprising:
a reception module configured to receive information;
a transmission module configured to transmit information; and
a processor configured to:
determine a localized enhanced physical downlink control channel (E-PDCCH) allocatable resource region;
attempt to decode a first E-PDCCH of the first UE in a first resource region included in the determined localized E-PDCCH allocatable resource region; and
control the reception module to receive the downlink control information transmitted from an eNB (e Node-B) on the first E-PDCCH when the first E-PDCCH has been successfully decoded,
wherein the determined localized E-PDCCH allocatable resource region is set as a group of partial resource regions in corresponding partitions when a downlink system bandwidth includes a plurality of partitions,
wherein the downlink control information includes information indicating that a physical downlink shared channel (PDSCH) of the first UE is allocated to a second resource region in the determined localized E-PDCCH allocatable resource region and information indicating whether a second E-PDCCH of a second UE instead of the PDSCH of the first UE is present in the second resource region,
wherein an aggregation level for the first E-PDCCH is set higher than 4 when the first E-PDCCH is allocated according to distributed allocation, and
wherein the aggregation level for the first E-PDCCH is set equal to or lower than 4 when the first E-PDCCH is allocated according to localized allocation.
14. The method according to claim 11 , wherein:
the group of partial resource regions is determined according to predetermined priority of the plurality of partitions; and
the predetermined priority is set according to channel quality of the plurality of partitions.
15. The method according to claim 14 , wherein priority of the plurality of partitions is assigned according to channel quality.
16. The method according to claim 11 , wherein:
the plurality of partitions corresponds to a plurality of subbands;
at least one of the plurality of subbands includes a plurality of resource blocks; and
the group of partial resource regions includes resource blocks having lowest indexes in the corresponding subbands.
17. The method according to claim 16 , wherein each of a plurality of resource blocks belonging to the localized E-PDCCH allocatable resource region includes a plurality of enhanced-control channel elements (E-CCEs).
18. The method according to claim 16 , wherein the localized E-PDCCH allocatable resource region is set to include enhanced-control channel elements (E-CCEs) belonging to a subband having high channel quality.
19. The method according to claim 11 , wherein configuration information related to at least the plurality of partitions or the group of partial resource regions is provided to an entity receiving the first E-PDCCH via higher layer signaling.
20. The method according to claim 11 , wherein the first E-PDCCH is located on orthogonal frequency division multiplex (OFDM) symbols other than a first four OFDM symbols in a downlink subframe.