Device and method for monitoring control channel in multicarrier system
A method for monitoring a control channel in a multiple carrier system, and a user equipment (UE) therefore are discussed. The method according to one embodiment includes, if an aggregation of carriers is configured and if a carrier indicator field (CIF) is configured, monitoring a plurality of downlink control channels within a plurality of UE-specific search spaces of a first carrier; and receiving downlink control information (DCI) on at least one of the plurality of the downlink control channels, which is successfully decoded, via the first carrier. The DCI includes scheduling information on either a downlink channel or an uplink channel in a second carrier.
1. A method for monitoring a control channel in a multiple carrier system, the method comprising:
if an aggregation of carriers is configured and if a carrier indicator field (CIF) is configured, monitoring a plurality of downlink control channels within a plurality of UE-specific search spaces of a first carrier; and
receiving downlink control information (DCI) on at least one of the plurality of the downlink control channels, which is successfully decoded, via the first carrier,
wherein a start point for each of the plurality of UE-specific search spaces is determined based on the CIF, and
wherein the DCI includes scheduling information on either a downlink channel or an uplink channel in a second carrier.
2. The method of claim 1 , wherein the start point for each of the plurality of UE-specific search spaces is determined based on the CIF if the CIF is configured.
3. The method of claim 2 , wherein the start point for each of the UE-specific search spaces is different from a start point for a common search space.
4. The method of claim 1 , wherein at least one of the plurality of UE-specific search spaces has a different size from those of the remaining UE-specific search spaces.
5. The method of claim 1 , wherein the plurality of UE-specific search spaces are located in one subframe.
6. The method of claim 1 , wherein the second carrier is indicated by the CIF.
7. The method of claim 1 , wherein the DCI received on the at least one downlink control channel of the first carrier includes the CIF indicating the second carrier.
8. The method of claim 1 , further comprising:
either receiving the downlink channel on the second carrier or transmitting the uplink channel on the second carrier.
9. A user equipment (UE) for monitoring a control channel in a multiple carrier system, the UE comprising:
a transceiver configured to transmit and receive radio signals; and
a processor operatively connected to the transceiver and configured to:
if an aggregation of carriers is configured and if a carrier indicator field (CIF) is configured, monitor a plurality of downlink control channels within a plurality of UE-specific search spaces of a first carrier, and
receive downlink control information (DCI) on at least one of the plurality of the downlink control channels, which is successfully decoded, via the first carrier,
wherein a start point for each of the plurality of UE-specific search spaces is determined based on the CIF, and
wherein the DCI includes scheduling information on either a downlink channel or an uplink channel in a second carrier.
10. The UE of claim 9 , wherein the start point for each of the plurality of UE-specific search spaces is determined based on the CIF if the CIF is configured.
11. The UE of claim 10 , wherein the start point for each of the UE-specific search spaces is different from a start point for a common search space.
12. The UE of claim 9 , wherein at least one of the plurality of UE-specific search spaces has a different size from those of the remaining UE-specific search spaces.
13. The UE of claim 9 , wherein the plurality of UE-specific search spaces are located in one subframe.
14. The UE of claim 9 , wherein the second carrier is indicated by the CIF.
15. The UE of claim 9 , wherein the DCI received on the at least one downlink control channel of the first carrier includes the CIF indicating the second carrier.
16. The UE of claim 9 , wherein the processor is further configured to either receive the downlink channel on the second carrier or transmit the uplink channel on the second carrier.