Method for mapping between codeword and layer in next generation communication system and apparatus therefor
Disclosed is a method for receiving a downlink signal by a terminal in a wireless communication system. Specifically, the method comprises the steps of: receiving, from a network, information on at least two first-type reference signal port groups and information on at least two second-type reference signal port groups; and receiving, from at least two transmission points constituting the network, a downlink signal including at least two codewords by using the information on the at least two first-type reference signal port groups and the information on the at least two second-type reference signal port groups, wherein the at least two first-type reference signal port groups correspond to different transmission points and the at least two second-type reference signal port groups correspond to different codewords.
1. A method of receiving a downlink signal by a user equipment (UE) in a wireless communication system, the method comprising:
receiving three or more channel status information-reference signals (CSI-RSs) from a network;
reporting rank information for each of the three or more CSI-RSs to the network;
receiving, from the network, control information about three or more first type demodulation-reference signal (DM-RS) port groups and information about two second type DM-RS port groups, wherein the three or more first type DM-RS port groups and the two second type DM-RS port groups are determined based on the rank information; and
receiving the downlink signal from three or more network transmission points based on the control information,
wherein the downlink signal includes two codewords,
wherein the three or more first type DM-RS port groups correspond to the three or more transmission points,
wherein the two second type DM-RS port groups correspond to the two codewords,
wherein one of the two codewords is received from two transmission points among the three or more transmission points, and
wherein the control information includes information related to a mapping relationship between a second type DM-RS port group corresponding to the one codeword and two first type DM-RS port groups corresponding to the two transmission points.
2. The method of claim 1 , wherein receiving the downlink signal comprises receiving the downlink signal on an assumption that antenna ports in each of the three or more first type DM-RS port groups are quasi co-located (QCL) with the same CSI-RS.
3. A user equipment (UE) in a wireless communication system, the UE comprising:
a receiver; and
a processor operatively connected to the receiver,
wherein the processor is configured to:
receive three or more channel status information-reference signals (CSI-RSs) from a network;
report rank information for each of the three or more CSI-RSs to the network;
receive, from the network, control information about three or more first type demodulation-reference signal (DM-RS) port groups and information about two second type DM-RS port groups, wherein the three or more first type DM-RS port groups and the two second type DM-RS port groups are determined based on the rank information; and
receive a downlink signal from three or more network transmission points based on the control information,
wherein the downlink signal includes two codewords,
wherein the three or more first type DM-RS port groups correspond to the three or more transmission points, and
wherein the two second type DM-RS port groups correspond to the two codewords,
wherein one of the two codewords is received from two transmission points among the three or more transmission points, and
wherein the control information includes information related to a mapping relationship between a second type DM-RS port group corresponding to the one codeword and two first type DM-RS port groups corresponding to the two transmission points.
4. The UE of claim 3 , wherein the processor is further configured to receive the downlink signal on an assumption that antenna ports in each of the two first type DM-RS port groups are quasi co-located (QCL) with the same CSI-RS.