Method and apparatus for performing measurement in wireless communication system
A method and apparatus for performing measurement are disclosed. The method for performing radio link monitoring by a user equipment (UE) in a wireless communication system includes: performing cancellation of a reference signal (RS) of a neighbor cell; and determining whether to declare a radio link failure (RLF) on the basis of a reference signal (RS) of a serving cell by using information of a predetermined power ratio related to the neighbor cell.
1. A method for performing radio link monitoring by a user equipment (UE) in a wireless communication system, the method comprising:
receiving predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a physical downlink control channel (PDCCH) of the neighbor cell to a transmission power of a cell-specific reference signal (CRS) of the neighbor cell;
measuring a CRS of the serving cell;
performing cancellation of the CRS of the neighbor cell from the CRS of the serving cell;
calculating a signal-to-interference plus noise ratio (SINR) of the serving cell using the predetermined power ratio information and the CRS of the serving cell; and
determining whether to declare a radio link failure (RLF) for the serving cell based on the SINR of the serving cell.
2. The method according to claim 1 , wherein the predetermined power ratio information is transmitted to the UE through higher layer signaling.
3. The method according to claim 1 , wherein the neighbor cell is a cell used as an interference source when the UE receives the CRS of the serving cell.
4. A method for receiving system information by a user equipment (UE) in a wireless communication system, the method comprising:
receiving predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a physical downlink control channel (PDCCH) of the neighbor cell to a transmission power of a cell-specific reference signal (CRS) of the neighbor cell;
performing cancellation of a physical broadcast channel (PBCH) signal of the neighbor cell;
performing a channel estimation of the serving cell based on the cancellation and the predetermined power ratio information; and
receiving system information through a PBCH of the serving cell based on the channel estimation.
5. The method according to claim 4 , wherein the serving cell and the neighbor cell are identical in terms of at least one of a radio frame and a subframe boundary.
6. The method according to claim 4 , wherein the predetermined power ratio information is transmitted to the UE through higher layer signaling.
7. The method according to claim 4 , wherein the neighbor cell is a cell used as an interference source when the UE receives a CRS of the serving cell.
8. A user equipment (UE) apparatus for use in a wireless communication system, the UE apparatus comprising:
a receiver; and
a processor configured to:
control the receiver to receive a predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a physical downlink control channel (PDCCH) of the neighbor cell to a transmission power of a cell-specific reference signal (CRS) of the neighbor cell,
measure a CRS of the serving cell,
perform cancellation of the CRS of the neighbor cell from the CRS of the serving cell,
calculate a signal-to-interference plus noise ratio (SINR) of the serving cell using the predetermined power ratio information and the CRS of the serving cell, and
determine whether to declare a radio link failure (RLF) for the serving cell of the UE based on based on the SINR of the serving cell.
9. A user equipment (UE) apparatus for use in a wireless communication system, the UE apparatus comprising:
a receiver; and
a processor configured to:
control the receiver to receive a predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a cell-specific reference signal (CRS) of the neighbor cell;
perform cancellation of a physical broadcast channel (PBCH) signal of the neighbor cell,
perform a channel estimation of the serving cell based on the cancellation and the predetermined power ratio information, and
receive system information through a PBCH of the serving cell based on the channel estimation.