Method and apparatus for resource mapping for physical channel in multiple cell system
The present invention relates to a wireless communication system. More particularly, provided is a method for determining a resource allocation scheme, related reference signals, transmission timing, transmission power, scrambling and the like for a physical channel so that a terminal can receive in an accurate and efficient manner the physical channel transmitted in a multiple cell environment.
1. A method for receiving a downlink channel from at least one transmit (Tx) point among a plurality of Tx points by a user equipment (UE), the method comprising:
receiving, from a first Tx point, information related to a resource mapping position of a downlink data channel, and an indicator which indicates a second Tx point;
receiving downlink data through cooperative transmission of the first Tx point and the second Tx point,
wherein the first Tx point is a serving cell and the second Tx point is a neighbor cell; and
demodulating the downlink data channel, based on whether a downlink subframe of the first Tx point is a Multicast Broadcast Single Frequency Network (MBSFN) subframe or a non-MBSFN subframe,
wherein, when the downlink subframe is the MBSFN subframe of the first Tx point, the downlink data channel is demodulated based on a UE-specific reference signal of the first Tx point; and
wherein, when the downlink subframe is the non-MBSFN subframe of the first Tx point, the downlink data channel is demodulated based on a cell-specific reference signal (CRS) of the first Tx point and on an assumption that the downlink channel is not mapped to a resource element (RE) position of a CRS of the second Tx point according to the information related to the resource mapping position of the downlink data channel.
2. The method according to claim 1 , wherein the plurality of Tx points are Tx points composed of candidates of data transmission toward the UE.
3. The method according to claim 1 , wherein, through higher layer signaling, the UE is established in a Tx mode in which the downlink data channel is demodulated based on a UE-specific reference signal.
4. The method according to claim 1 , wherein the information related to the resource mapping position of the downlink data channel is used to demodulate an enhanced-control channel mapped to a data region of the downlink subframe.
5. A user equipment (UE) for receiving a downlink channel from at least one transmit (Tx) point among a plurality of Tx points, the UE comprising:
a transmitter configured to transmit signals in an uplink channel;
a receiver configured to receive signals in the downlink channel; and
a processor configured to:
control the receiver to receive, from a first Tx point, information related to a resource mapping position of a downlink data channel, and an indicator which indicates a second Tx point,
control the receiver to receive downlink data through cooperative transmission of the first Tx point and the second Tx point, wherein the first Tx point is a serving cell and the second Tx point is a neighbor cell,
demodulate the downlink data channel, based on whether a downlink subframe of the first Tx point is a Multicast Broadcast Single Frequency Network (MBSFN) subframe or a non-MBSFN subframe,
wherein, when the downlink subframe is the MBSFN subframe of the first Tx point, the downlink data channel is demodulated based on a UE-specific reference signal of the first Tx point, and
wherein, when the downlink subfrarne is the non-MBSFN subframe of the first Tx point, the downlink data channel is demodulated based on a cell-specific reference signal (CRS) of the first Tx point and on an assumption that the downlink channel is not mapped to a resource element (RE)position of a CRS of the second Tx point according to the information related to the resource mapping position of the downlink data channel.