Method and apparatus for reducing inter-cell interference in radio communication system
A method of a first cell for supporting a downlink channel demodulation at a user equipment, the method includes transmitting, by the first cell to the user equipment via a higher layer signaling, information on a Cell-specific Reference Signal (CRS) of a second cell including Multicast/Broadcast over Single Frequency Network (MBSFN) subframe configuration information of the second cell; and transmitting, by the first cell to the user equipment, a downlink signal on the downlink channel, wherein the information on the CRS of the second cell is used by the user equipment to demodulate the downlink channel from the first cell.
1. A method of a first cell for supporting a downlink channel demodulation at a user equipment, the method comprising:
transmitting, by the first cell to the user equipment via a higher layer signaling, information on a Cell-specific Reference Signal (CRS) of a second cell including Multicast/Broadcast over Single Frequency Network (MBSFN) subframe configuration information of the second cell; and
transmitting, by the first cell to the user equipment, a downlink signal on the downlink channel,
wherein the information on the CRS of the second cell is used by the user equipment to demodulate the downlink channel from the first cell.
2. The method of claim 1 , wherein the information on the CRS of the second cell further includes a number of CRS antenna ports of the second cell.
3. The method of claim 1 , wherein the MBSFN subframe configuration information indicates one or more subframes not containing the CRS in a data region.
4. The method of claim 1 , wherein the MBSFN subframe configuration information indicates one or more subframes containing the CRS only in a control region.
5. The method of claim 1 , wherein the information on the CRS of the second cell is used by the user equipment to mitigate inter-cell interference from the CRS of the second cell.
6. The method of claim 1 , wherein the downlink channel is a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).
7. The method of claim 1 , wherein the first cell is a serving cell and the second cell is a neighbor cell.
8. A method of a user equipment for demodulating a downlink channel, the method comprising:
receiving, by the user equipment from a first cell via a higher layer signaling, information on a Cell-specific Reference Signal (CRS) of a second cell including Multicast/Broadcast over Single Frequency Network (MBSFN) subframe configuration information of the second cell; and
receiving, by the user equipment from the first cell, a downlink signal on the downlink channel,
wherein the information on the CRS of the second cell is used by the user equipment to demodulate the downlink channel from the first cell.
9. A base station of a first cell for supporting a downlink channel demodulation at a user equipment, the base station comprising:
a receiver;
a transmitter; and
a processor configured to:
transmit, to the user equipment via a higher layer signaling, information on a Cell-specific Reference Signal (CRS) of a second cell including Multicast/Broadcast over Single Frequency Network (MBSFN) subframe configuration information of the second cell, and
transmit, via the transmitter to the user equipment, a downlink signal on the downlink channel,
wherein the information on the CRS of the second cell is used by the user equipment to demodulate the downlink channel from the first cell.
10. A user equipment for demodulating a downlink channel, the user equipment comprising:
a receiver;
a transmitter; and
a processor configured to:
receive, from a first cell via a higher layer signaling, information on a Cell-specific Reference Signal (CRS) of a second cell including Multicast/Broadcast over Single Frequency Network (MBSFN) subframe configuration information of the second cell, and
receive, via the receiver from the first cell, a downlink signal on the downlink channel,
wherein the information on the CRS of the second cell is used by the user equipment to demodulate the downlink channel from the first cell.