IP Library › Granted Patent US 12,301,398
Granted Patent B2
US 12,301,398 · App. 18/659,891 · Granted May 13, 2025

Systems and methods for phase noise tracking reference signal sequence generation using demodulation reference signals

Inventors: Martin Hessler (Linköping, SE); Robert Baldemair (Solna, SE); Lars Lindbom (Karlstad, SE); Henrik Sahlin (Mölnlycke, SE); Niclas Wiberg (Linköping, SE)
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
H04L27/2613H04L5/001H04L5/0051H04L27/2332H04L27/2607H04L27/2675H04L5/0007
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Quick Facts
Patent No.
US 12,301,398
App. No.
18/659,891
Granted
May 13, 2025
Kind
B2
Abstract

A user equipment ( 910 ) is provided for use in a cellular network. The user equipment includes a transceiver ( 1010 ), a processor ( 1020 ), and a memory ( 1030 ). The user equipment ( 910 ) is configured to determine, for a data transmission, a mapping form a demodulation reference signal (DMRS) to a PNT-RS. A DMRS resulting signal is generated from a subset of DMRS for a first resource element in a subcarrier. The DMRS resulting signal is copied from the first resource element to a second resource element assigned to the PNT-RS in the subcarrier. The data transmission is transmitted using the DMRS resulting signal and the PNT-RS.

Claims (20)

1. A method by a user equipment in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the method comprising:

generating a value for a PNT-RS sequence in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM, symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and

transmitting the data transmission, the DMRS and the PNT-RS to the network.

2. The method of claim 1 , wherein the first resource element is associated with a first OFDM symbol and the second resource element is associated with a second OFDM symbol.

3. The method according to claim 1 , wherein the DMRS is a complex value and wherein the complex value of the first resource element is used to generate the PNT-RS in each OFDM symbol of the subcarrier assigned to the PNT-RS.

4. The method of claim 1 , wherein the generated PNT-RS is continuous in all OFDM symbols of the subcarrier.

5. The method of claim 1 , wherein the PNT-RS is generated by copying the DMRS.

6. A method by a wireless transmitter in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the method comprising:

generating a value for PNT-RS in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and

transmitting the data transmission, the DMRS and the PNT-RS to a wireless receiver.

7. A method by a network node in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the method comprising:

generating a value for PNT-RS in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM, symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and

transmitting the data transmission, the DMRS and the PNT-RS to a user equipment.

8. A user equipment in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the user equipment comprising a transceiver, a memory, and a processor, the user equipment configured to:

Generating a value for a PNT-RS sequence in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM, symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and

transmit the data transmission, the DMRS and the PNT-RS to the network.

9. The user equipment of claim 8 , wherein the first resource element is associated with a first OFDM symbol and the second resource element is associated with a second OFDM symbol.

10. The user equipment according to claim 8 , wherein the DMRS is a complex value and wherein the user equipment is configured to use the complex value of the first resource element to generate the PNT-RS in each OFDM symbol of the subcarrier assigned to the PNT-RS.

11. The user equipment of claim 8 , wherein the generated PNT-RS is continuous in all OFDM symbols of the subcarrier.

12. The user equipment of claim 8 , wherein the user equipment is configured to generate the PNT-RS by copying the DMRS.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 9, 2024
From: BALDEMAIR, ROBERT; HESSLER, MARTIN; LINDBOM, LARS; SAHLIN, HENRIK; WIBERG, NICLAS
To: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Reel/Frame 067366/0317 →
Continuity (6)
Continuation 18132493 · Apr 10, 2023
Continuation 17725168 · Apr 20, 2022
Continuation 16738829 · Jan 9, 2020
Continuation 16076038
Provisional Application 62292990 · Feb 9, 2016
Related Publication 20240291701A1 · Aug 29, 2024
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