Method and apparatus for configuring DMRS in wireless communication system

Patent metadata

Field	Value
Publication number	US-12549424-B2
Application number	US-202418779631-A
Country	US
Kind code	B2
Filing date	Jul 22, 2024
Priority date	Jan 11, 2019
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A communication method of a terminal with another terminal through a sidelink comprises: determining, by a first user device, one or more radio resource control (RRC) configurations comprising information of a demodulation reference signal (DMRS) for vehicle-to-everything (V2X) communication between user devices; determining, based on the one or more RRC configurations, a Physical Sidelink Control Channel (PSCCH) DMRS for a PSCCH; determining, based on a cyclic redundancy code of the PSCCH, an identifier; determining, based on the identifier, an initialization value associated with a Physical Sidelink Shared Channel (PSSCH) DMRS for a PSSCH; and via one or more orthogonal frequency division multiplexing (OFDM) symbols, transmitting, by the first user device to a second user device, the PSCCH DMRS and the PSSCH DMRS.

First claim

What is claimed is:

1 . A first user device comprising:
at least one antenna configured to receive at least one wireless signal from a base station, wherein the at least one wireless signal is received via a physical downlink channel; at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first user device to:
determine at least one radio resource control (RRC) configuration comprising information of a demodulation reference signal (DMRS) for vehicle-to-everything (V2X) communication between user devices;
determine, based on the at least one RRC configuration, a Physical Sidelink Control Channel (PSCCH) DMRS for a PSCCH;
determine, based on a cyclic redundancy code of the PSCCH, an identifier, wherein the identifier corresponds to N ID n SCID , wherein N ID n SCID ∈{0, 1, 2, . . . , 65535}, and wherein N ID n SCID is determined based on the cyclic redundancy code of the PSCCH;
determine, based on the identifier, an initialization value of a DMRS sequence of a Physical Sidelink Shared Channel (PSSCH) DMRS for a PSSCH; and
via at least one orthogonal frequency division multiplexing (OFDM) symbol, transmit, to a second user device, the PSCCH DMRS and the PSSCH DMRS.

2 . The first user device of claim 1 , wherein the instructions, when executed by the at least one processor, cause the first user device to:
determine the PSCCH and the PSSCH; and transmit, via the at least one OFDM symbol, the PSCCH and the PSSCH.

3 . The first user device of claim 1 , wherein the instructions, when executed by the at least one processor, cause the first user device to:
generate, based on the initialization value, the PSSCH DMRS.

4 . The first user device of claim 3 , wherein the initialization value is determined based on:

(

2
17

⁢

(

N
symb
slot

⁢

n

s
,
f

μ

+
l
+
1

)

⁢

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2
⁢

N
ID

n
SCID

+
1

)

+

2
⁢

N
ID

n
SCID

+

n
SCID

)

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mod
⁢

2
31

,

wherein N symb slot is a total number of symbols per slot, n s,f μ is a slot number within a frame, l is an OFDM symbol number, and n SCID is set to zero for the PSSCH DMRS.

5 . The first user device of claim 4 , wherein n SCID is not signaled to the first user device.

6 . The first user device of claim 4 , wherein N ID n SCID is determined based on a sidelink control information (SCI) identifier (ID), and
wherein the SCI ID is determined based on the cyclic redundancy code of the PSCCH.

7 . The first user device of claim 6 , wherein the SCI ID is a sidelink layer-1 ID.

8 . The first user device of claim 1 , wherein the instructions, when executed by the at least one processor, cause the first user device to determine the PSCCH DMRS by:
determining, based on the information of a DMRS for V2X communication between user devices, an initialization value, C init , associated with the PSCCH DMRS, wherein the initialization value, C init , is determined based on:

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2
17

⁢

(

14
⁢

n

s
,
f

μ

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l
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1

)

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(

2
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N
ID
0

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ID
0

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mod
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31

,

wherein n s,f μ is a slot number within a frame, l is an OFDM symbol number, and N ID 0 ∈{0, 1, 2, . . . , 65535}, and
wherein N ID 0 is signaled by RRC signaling or a fixed value.

9 . The first user device of claim 1 , wherein the instructions, when executed by the at least one processor, cause the first user device to determine, based on sidelink contr

Assignees

• Innovative Tech Lab Co Ltd

Inventors

• Yoon Sung Jun

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title