US Patent No. 11,071,125

METHOD FOR TRANSMITTING OR RECEIVING CHANNEL STATE INFORMATION REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR


Patent No. 11,071,125
Issue Date July 20, 2021
Title Method For Transmitting Or Receiving Channel State Information Reference Signal In Wireless Communication System And Device Therefor
Inventorship Haewook Park, Seoul (KR)
Jonghyun Park, Seoul (KR)
Assignee LG Electronics Inc., Seoul (KR)

Claim of US Patent No. 11,071,125


1. A method of receiving a channel state information-reference signal (CSI-RS) by a user equipment (UE) in a wireless communication system, the method comprising:receiving, from a base station, CSI-RS configuration information regarding a CSI-RS configuration to which the CSI-RS is mapped, wherein the CSI-RS configuration to an aggregation of a plurality of legacy CSI-RS configurations and the plurality of legacy CSI-RS configurations is mapped to a plurality of antenna ports numbered with corresponding legacy CSI-RS port numbers, and
receiving, from the base station, the CSI-RS through the plurality of antenna ports based on the CSI-RS configuration information,
wherein the CSI-RS configuration is a code division multiplexing (CDM) type with CDM of length 4,
wherein one or more first CSI-RS configurations of the plurality of legacy CSI-RS configurations are shared with a legacy UE and one or more second CSI-RS configurations of the plurality of legacy CSI-RS configurations are not shared with the legacy UE,
wherein a port numbering method of first antenna ports to which the one or more first CSI-RS configurations are mapped is configured differently from a port numbering method of second antenna ports to which the one or more second CSI-RS configurations are mapped,
wherein the aggregation of the plurality of legacy CSI-RS configurations is based on CSI-RS configurations of an identical port number,
wherein the second antenna ports are mapped to an antenna port group and each of the second antenna ports have the identical port number, and
wherein half the number of legacy CSI-RS port numbers related to the one or more second CSI-RS configurations are assigned to second antenna ports having a first polarization, and remaining legacy CSI-RS port numbers are assigned to second antenna ports having a second polarization different from the first polarization,
wherein a mapping relation between a total number of CSI-RS ports and the legacy CSI-RS port numbers is represented by Equation 1:




where u(x)=1 if x>0, otherwise u(x)=0.
wherein, in Equation 1, n indicates the total number of CSI-RS ports, k indicates an assigned configuration number per the plurality of legacy CSI-RS configurations, K indicates a total number of the plurality of legacy CSI-RS configurations, N indicates a number of ports per the plurality of legacy CSI-RS configurations, p? indicates a number of legacy CSI-RS ports mapped to the total number of CSI-RS ports in a one-to-one manner, and J indicates a number of legacy CSI-RS configurations shared with the legacy UE.