US-12621196-B2 - Method and device for transmitting/receiving demodulation reference signal in wireless communication system

US12621196B2US 12621196 B2US12621196 B2US 12621196B2US-12621196-B2

Abstract

A method and a device for transmitting/receiving a demodulation reference signal in a wireless communication system are disclosed. A method for receiving a demodulation reference signal (DM-RS) according to an embodiment of the present disclosure may include the steps of: receiving configuration information related to a DM-RS from a base station; receiving a downlink control information (DCI) for scheduling a physical downlink control channel (PDSCH) from the base station; and receiving the PDSCH and a MD-RS for the PDSCH, based on the DCI.

Inventors

Hyungtae Kim
Jiwon Kang
Haewook Park
Kyuseok Kim
Seongwon GO

Assignees

LG ELECTRONICS INC.

Dates

Publication Date: 20260505
Application Date: 20220712
Priority Date: 20210716

Claims (12)

1 . A method of receiving a demodulation reference signal (DM-RS) in a wireless communication system, the method performed by a user equipment (UE) comprising: receiving, from a base station, configuration information related to a DM-RS; receiving, from the base station, downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); and receiving the PDSCH and a DM-RS for the PDSCH based on the DCI, wherein i) a first DM-RS pattern and ii) a second DM-RS pattern having less density than the first DM-RS pattern in a frequency domain are configured by the configuration information, wherein based on whether one or more antenna ports indicated by the DCI are associated with single-user (SU) transmission or multi-user (MU) transmission, a pattern of the DM-RS is determined among the first DM-RS pattern and the second DM-RS pattern, and wherein the second DM-RS pattern is configured based on a specific sub-code division multiplexing (CDM) group among a plurality of sub-CDM groups defined in a single CDM group for the first DM-RS pattern.
2 . The method of claim 1 , wherein based on the one or more antenna ports indicated by the DCI being associated with SU transmission, the pattern of the DM-RS is determined by the first DM-RS pattern.
3 . The method of claim 1 , wherein based on the one or more antenna ports indicated by the DCI being associated with MU transmission, the pattern of the DM-RS is determined by the second DM-RS pattern.
4 . The method of claim 1 , wherein one or more specific antenna ports are predefined as being associated with the SU transmission, and wherein remaining antenna ports other than the specific one or more antenna ports are associated with the MU transmission.
5 . The method of claim 1 , wherein based on the one or more antenna ports indicated by the DCI being associated with SU transmission and the pattern of the DM-RS being determined as the second DM-RS pattern, the PDSCH is transmitted in one or more sub-CDM groups other than a sub-CDM group in which the DM-RS is transmitted.
6 . The method of claim 1 , wherein based on the one or more antenna ports indicated by the DCI being associated with MU transmission and the pattern of the DM-RS being determined as the second DM-RS pattern, the PDSCH is not transmitted in one or more sub-CDM groups other than a sub-CDM group in which the DM-RS is transmitted.
7 . The method of claim 1 , wherein the plurality of sub-CDM groups are defined by a unit to which a frequency domain-orthogonal cover code (FD-OCC) is applied within the single CDM group.
8 . The method of claim 1 , wherein a plurality of grouping methods with different numbers of sub-CDM groups are defined in the single CDM group, and wherein the second DM-RS pattern is configured as one of the plurality of grouping methods.
9 . The method of claim 1 , wherein the plurality of sub-CDM groups are repeated in units of specific physical resource blocks (PRB) in a frequency domain.
10 . The method of claim 1 , further comprising: reporting, to the base station, i) information on a duration and/or ii) information on a start and an end to which the first DM-RS pattern or the second DM-RS pattern can be applied.
11 . A user equipment (UE) of receiving a demodulation reference signal (DM-RS) in a wireless communication system, the UE comprising: at least one transceiver for transmitting and receiving a wireless signal; and at least one processor for controlling the at least one transceiver, wherein the at least one processor configured to: receive, from a base station, configuration information related to a DM-RS; receive, from the base station, downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); and receive the PDSCH and a DM-RS for the PDSCH based on the DCI, wherein i) a first DM-RS pattern and ii) a second DM-RS pattern having less density than the first DM-RS pattern in a frequency domain are configured by the configuration information, wherein based on whether one or more antenna ports indicated by the DCI are associated with single-user (SU) transmission or multi-user (MU) transmission, a pattern of the DM-RS is determined among the first DM-RS pattern and the second DM-RS pattern, and wherein the second DM-RS pattern is configured based on a specific sub-code division multiplexing (CDM) group among a plurality of sub-CDM groups defined in a single CDM group for the first DM-RS pattern.
12 . A base station of transmitting a demodulation reference signal (DM-RS) in a wireless communication system, the base station comprising: at least one transceiver for transmitting and receiving a wireless signal; and at least one processor for controlling the at least one transceiver, wherein the at least one processor configured to: transmit, to a user equipment (UE), configuration information related to a DM-RS; transmit, to the UE, downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH); and transmit the PDSCH and a DM-RS for the PDSCH based on the DCI, wherein i) a first DM-RS pattern and ii) a second DM-RS pattern having less density than the first DM-RS pattern in a frequency domain are configured by the configuration information, and wherein based on whether one or more antenna ports indicated by the DCI are associated with single-user (SU) transmission or multi-user (MU) transmission, a pattern of the DM-RS is determined among the first DM-RS pattern and the second DM-RS pattern, and wherein the second DM-RS pattern is configured based on a specific sub-code division multiplexing (CDM) group among a plurality of sub-CDM groups defined in a single CDM group for the first DM-RS pattern.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2022/010085, filed on Jul. 12, 2022, which claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2021-0093273, filed on Jul. 16, 2021, the contents of which are all incorporated by reference herein in their entirety. TECHNICAL FIELD The present disclosure relates to a wireless communication system, and in more detail, relates to a method and an apparatus of transmitting and receiving a demodulation reference signal (DM-RS) in a wireless communication system. BACKGROUND A mobile communication system has been developed to provide a voice service while guaranteeing mobility of users. However, a mobile communication system has extended even to a data service as well as a voice service, and currently, an explosive traffic increase has caused shortage of resources and users have demanded a faster service, so a more advanced mobile communication system has been required. The requirements of a next-generation mobile communication system at large should be able to support accommodation of explosive data traffic, a remarkable increase in a transmission rate per user, accommodation of the significantly increased number of connected devices, very low End-to-End latency and high energy efficiency. To this end, a variety of technologies such as Dual Connectivity, Massive Multiple Input Multiple Output (Massive MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super wideband Support, Device Networking, etc. have been researched. SUMMARY A technical object of the present disclosure is to provide a method and an apparatus for transmitting and receiving a DM-RS. In addition, an additional technical object of the present disclosure is to provide a method and an apparatus for configuring a pattern in which a DM-RS is mapped in frequency-time resources. The technical objects to be achieved by the present disclosure are not limited to the above-described technical objects, and other technical objects which are not described herein will be clearly understood by those skilled in the pertinent art from the following description. A method of receiving a demodulation reference signal (DM-RS) in a wireless communication system may include: receiving, from a base station, configuration information related to a DM-RS; receiving, from the base station, downlink control information (DCI) for scheduling a physical downlink control channel (PDSCH); and receiving the PDSCH and a DM-RS for the PDSCH based on the DCI. i) A first DM-RS pattern and ii) a second DM-RS pattern having less density than the first DM-RS pattern in a frequency domain may be configured by the configuration information, and based on whether one or more antenna ports indicated by the DCI are associated with single-user (SU) transmission or multi-user (MU) transmission, a pattern of the DM-RS may be determined among the first DM-RS pattern and the second DM-RS pattern. A method of transmitting a demodulation reference signal (DM-RS) in a wireless communication system according to an additional aspect of the present disclosure may include: transmitting, to a user equipment (UE), configuration information related to a DM-RS; transmitting, to the UE, downlink control information (DCI) for scheduling a physical downlink control channel (PDSCH); and transmitting the PDSCH and a DM-RS for the PDSCH based on the DCI. i) A first DM-RS pattern and ii) a second DM-RS pattern having less density than the first DM-RS pattern in a frequency domain may be configured by the configuration information, and based on whether one or more antenna ports indicated by the DCI may be associated with single-user (SU) transmission or multi-user (MU) transmission, a pattern of the DM-RS is determined among the first DM-RS pattern and the second DM-RS pattern. According to an embodiment of the present disclosure, lower overhead and more antenna ports can be supported compared to the existing DM-RS pattern. In addition, according to an embodiment of the present disclosure, by reducing DM-RS overhead and applying an optimized DM-RS pattern, throughput for data transmission and reception can be improved. Effects achievable by the present disclosure are not limited to the above-described effects, and other effects which are not described herein may be clearly understood by those skilled in the pertinent art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS Accompanying drawings included as part of detailed description for understanding the present disclosure provide embodiments of the present disclosure and describe technical features of the present disclosure with detailed description. FIG. 1 illustrates a structure of a wireless communication system to which the present disclosure may be applied. FIG. 2 illustrates a frame structure in a wireless communication system to which the present