Method and apparatus for obtaining reference signal

Patent metadata

Field	Value
Publication number	US-2026089040-A1
Application number	US-202519410103-A
Country	US
Kind code	A1
Filing date	Dec 5, 2025
Priority date	Aug 11, 2017
Publication date	Mar 26, 2026
Grant date	—

Abstract

This application relates to the mobile communications field, and in particular, to a technology for obtaining a reference signal in a wireless communications system. In a method for obtaining a reference signal, a terminal device obtains position offset information; the terminal device obtains a first sequence based on the position offset information; and the terminal device demodulates, by using the first sequence, a control channel signal carried in a control channel resource set, to obtain downlink control information. In this way, MU-MIMO transmission performance is improved.

First claim

1 . A method, comprising:
sending, by a network device, a first position and a first offset, wherein the first position is a quantity of physical resource blocks by which a smallest subcarrier within a bandwidth comprising a control channel resource set is offset from a frequency domain reference point, and wherein the first offset is a quantity of physical resource blocks by which a smallest subcarrier in the control channel resource set is offset from the smallest subcarrier within the bandwidth comprising the control channel resource set; and mapping, by the network device, a demodulation reference signal sequence to a resource element carrying the demodulation reference signal sequence in a control channel resource set, based on the first position and the first offset, wherein the demodulation reference signal sequence is used for demodulating a control channel signal carried in the control channel resource set, to obtain downlink control information.

2 . The method according to claim 1 , wherein:
a physical resource block number of the frequency domain reference point is 0, and the frequency domain reference point is notified by system information; or the frequency domain reference point is a candidate position of a channel raster.

3 . The method according to claim 1 , wherein the first position is indicated by higher layer signaling, wherein the higher layer signaling comprises radio resource control (RRC) signaling.

4 . The method according to claim 1 , wherein the first offset is determined based on configuration information comprised in higher layer signaling, wherein the higher layer signaling comprises radio resource control (RRC) signaling.

5 . The method according to claim 1 , wherein the demodulation reference signal sequence is mapped to a resource element in the control channel resource set.

6 . A communication apparatus, comprising:
one or more processors; and at least one memory, wherein the at least one memory stores instructions, and when executing the instructions stored in the memory, the one or more processors executes operations comprising: sending a first position and a first offset, wherein the first position is a quantity of physical resource blocks by which a smallest subcarrier within a bandwidth comprising a control channel resource set is offset from a frequency domain reference point, and wherein the first offset is a quantity of physical resource blocks by which a smallest subcarrier in the control channel resource set is offset from the smallest subcarrier within the bandwidth comprising the control channel resource set; and mapping a demodulation reference signal sequence to a resource element carrying the demodulation reference signal sequence in a control channel resource set, based on the first position and the first offset, wherein the demodulation reference signal sequence is used for demodulating a control channel signal carried in the control channel resource set, to obtain downlink control information.

7 . The apparatus according to claim 6 , wherein:
a physical resource block number of the frequency domain reference point is 0, and the frequency domain reference point is notified by system information; or the frequency domain reference point is a candidate position of a channel raster.

8 . The apparatus according to claim 6 , wherein:
the first position is indicated by higher layer signaling, wherein the higher layer signaling comprises radio resource control (RRC) signaling.

9 . The apparatus according to claim 6 , wherein:
the first offset is determined based on configuration information comprised in higher layer signaling, wherein the higher layer signaling comprises radio resource control (RRC) signaling.

10 . The apparatus according to claim 6 , wherein:
the demodulation reference signal sequence is mapped to a resource element carrying a reference signal in the control channel resource set.

11 . One or more non-transitory computer-readable media storing computer instructions, that when executed by one or more processors, cause a computing device to perform operations comprising:
sending a first position and a first offset, wherein the first position is a quantity of physical resource blocks by which a smallest subcarrier within a bandwidth comprising a control channel resource set is offset from a frequency domain reference point, and wherein the first offset is a quantity of physical resource blocks by which a smallest subcarrier in the control channel resource set is offset from the smallest subcarrier within the bandwidth comprising the control channel resource set; and mapping a demodulation reference signal sequence to a resource element carrying the demodulation reference signal sequence in a control channel resource set, based on the first position and the first offset, wherein the demodulation reference signal sequence is used for demodulating a control channel signal carried in the control channel resource set, to obtain downlink control information.

12 . The one or more non-transitory computer-readable media according to claim 11 , wherein:
a physical resource block number of the frequency domain reference point is 0, and the frequency domain reference point is notified by system information; or the frequency domain reference point is a candidate position of a channel raster.

13 . The one or more non-transitory computer-readable media according to claim 11 , wherein the first position is indicated by higher layer signaling, wherein the higher layer signaling comprises radio resource control (RRC) signaling.

14 . The one or more non-transitory computer-readable media according to claim 11 , wherein the first offset is determined based on configuration information comprised in higher layer signaling, wherein the higher layer signaling comprises radio resource control (RRC) signaling.

15 . The one or more non-transitory computer-readable media according to claim 11 , wherein the demodulation reference signal sequence is mapped to a resource element in the control channel resource set.

Assignees

• Huawei Tech Co Ltd

Inventors

• Xue Lixia
• Zhang Xu
• Zhou Yongxing

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/00

  Arrangements affording multiple use of the transmission path · CPC title

• H04L27/2666

  Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length · CPC title

• H04W72/04

  Wireless resource allocation · CPC title