Device and method for monitoring control channel in multicarrier system
Provided are a method and a device for monitoring the control channel in a multicarrier system. The terminal determines a plurality of terminal-specific search spaces corresponding respectively to a plurality of scheduled component carriers in a control region within a subframe. The terminal monitors a downlink control channel for the scheduled component carriers corresponding respectively to the plurality of terminal-specific search spaces.
1. A method for monitoring a control channel in a multiple carrier system, the method comprising:
receiving information related to a carrier indicator field (CIF);
if an aggregation of carriers is configured, determining a plurality of UE-specific search spaces of a first carrier;
monitoring a plurality of downlink control channels within the plurality of UE-specific search spaces of the first carrier; and
receiving downlink control information (DCI) on downlink control channels, which are 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 if the CIF is configured,
wherein the start point of each of the UE-specific search spaces is different from a start point of a common search space, and
wherein the DCI received on the downlink control channel of the first carrier 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 of each of the plurality of UE-specific search spaces is determined based on a number of available carriers.
3. The method of claim 1 , wherein the start point of each of the plurality of UE-specific search spaces is determined based on a total number of configured carriers.
4. The method of claim 1 , wherein the start point of each of the plurality of UE-specific search spaces is determined based on an index of a corresponding carrier.
5. The method of claim 1 , wherein the plurality of UE-specific search spaces all have the same size.
6. 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.
7. A user equipment (UE) for monitoring a control channel in a multiple carrier system, the UE comprising:
a radio frequency unit configured to transmit and receive radio signals; and
a processor operatively connected to the radio frequency unit and configured to:
receive information related to a carrier indicator field (CIF);
if an aggregation of carriers is configured, determine a plurality of UE-specific search spaces of a first carrier;
monitor a plurality of downlink control channels within the plurality of UE-specific search spaces of the first carrier; and
receive downlink control information (DCI) on a downlink control channels, which are 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 if the CIF is configured,
wherein the start point of each of the UE-specific search spaces is different from a start point of a common search space, and
wherein the DCI received on the downlink control channel of the first carrier includes scheduling information on either a downlink channel or an uplink channel in a second carrier.
8. The UE of claim 7 , wherein the start point of each of the plurality of UE-specific search spaces is determined based on a number of available carriers.
9. The UE of claim 7 , wherein the start point of each of the plurality of UE-specific search spaces is determined based on a total number of configured carriers.
10. The UE of claim 7 , wherein the start point of each of the plurality of UE-specific search spaces is determined based on an index of a corresponding carrier.
11. The method of claim 1 , wherein the plurality of UE-specific search spaces are located in one subframe.
12. The method of claim 1 , wherein the second carrier is indicated by the CIF.
13. The method of claim 1 , the DCI received on the at least one downlink control channel of the first carrier includes the CIF indicating the second carrier.
14. 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.
15. The UE of claim 7 , wherein the plurality of UE-specific search spaces are located in one subframe.
16. The UE of claim 7 , wherein the second carrier is indicated by the CIF.
17. The UE of claim 7 , the DCI received on the at least one downlink control channel of the first carrier includes the CIF indicating the second carrier.
18. The UE of claim 7 , 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.