Method and apparatus for searching control information by terminal in multinode system
Provided is a method of searching for control information of a user equipment (UE) in a multi-node system including a plurality of nodes and a base station connected to each of the plurality of nodes and capable of controlling the nodes. The method includes: receiving search space indication information from the base station; and searching for the control information in a radio resource region indicated by the search space indication information, wherein the search space indication information indicates any one of a first search space and a second search space.
1. A method for monitoring control information in a wireless communication system, the method performed by an advanced user equipment (UE) and comprising:
receiving a higher layer signal indicating a subframes in which the advanced UE has to monitor an enhanced physical downlink control channel (EPDCCH);
in a first subframe which is not indicated by the higher layer signal, monitoring a common search space for the advanced UE and a physical downlink control channel (PDCCH) UE-specific search space,
wherein the common search space for the advanced UE is same as a common search space for a legacy UE; and
in a second subframe which is indicated by the higher layer signal, monitoring a common search space for the advanced UE and an EPDCCH UE-specific search space,
wherein, in a time domain, the common search space for the advanced UE and the PDCCH UE-specific search space are located in first N orthogonal frequency division multiplexing (OFDM) symbols, where N indicates a number of OFDM symbols constituting a PDCCH of a subframe, N is a natural number and 1≤N≤4,
wherein, in the time domain, the EPDCCH UE-specific search space is located in at least one OFDM symbol after the N OFDM symbols in the subframe, and
wherein the advanced UE receives a signal in the EPDCCH UE-specific search space using a reference signal which is not used by the legacy UE in the PDCCH UE-specific search space.
2. The method of claim 1 , wherein the advanced UE monitors the common search space for the advanced UE using at least one of control channel element (CCE) aggregation level 4 and CCE aggregation level 8.
3. An advanced user equipment (UE) monitoring control information in a wireless communication system, the advanced UE comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor coupled with the RF unit and configured to:
receive a higher layer signal indicating a subframes in which the advanced UE has to monitor an enhanced physical downlink control channel (EPDCCH),
in a first subframe which is not indicated by the higher layer signal, monitor a common search space for the advanced UE and a physical downlink control channel (PDCCH) UE-specific search space,
wherein the common search space for the advanced UE is same as a common search space for a legacy UE, and
in a second subframe which is indicated by the higher layer signal, monitor a common search space for the advanced UE and an EPDCCH UE-specific search space,
wherein, in a time domain, the common search space for the advanced UE and the PDCCH UE-specific search space are located in first N orthogonal frequency division multiplexing (OFDM) symbols, where N indicates a number of OFDM symbols constituting a PDCCH of a subframe, N is a natural number and 1≤N≤4,
wherein, in the time domain, the EPDCCH UE-specific search space is located in at least one OFDM symbol after the N OFDM symbols in the subframe, and
wherein the advanced UE receives a signal in the EPDCCH UE-specific search space using a reference signal which is not used by the legacy UE in the PDCCH UE-specific search space.
4. The advanced UE of claim 3 , wherein the advanced UE monitors the common search space for the advanced UE using at least one of control channel element (CCE) aggregation level 4 and CCE aggregation level 8.