# US 12,009,962 B2 · Changing the phase tracking reference signal (PTRS) pattern over different symbols

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- Number: US 12,009,962 B2
- Document ID: US12009962B2
- Status: Granted
- Kind: B2
- Application number: 17/448,666
- Filed: 2021-09-23
- Published: 2022-04-07
- Granted: 2024-06-11
- Earliest claimed: 2020-10-06
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Ahmed Abdelaziz Ibrahim Abdelaziz Zewail; Zhifei Fan; Xiaoxia Zhang; Tao Luo; Jing Sun; Wooseok Nam
- Web page: https://patentgrep.com/patent/US12009962B2

## CPC

- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 27/2675: {Pilot or known symbols}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length}
- H04L 27/2662: {Symbol synchronisation}
- H04L 27/2692: {with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver}
- H04L 5/0023: {Time-frequency-space}
- H04L 25/03821: {Inter-carrier interference cancellation [ICI]}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Aspects of the present disclosure can be implemented in a method for wireless communication by a first wireless node, such as a user equipment (UE) or network entity. The method generally includes identifying different patterns of phase tracking reference signal (PTRS) tones for receiving a PTRS, determining when to change at least one of the different patterns of the PTRS tones from one symbol to another, and monitoring for one or more symbols of the PTRS, from a second wireless node, according to the determination.

## Claims

### Claim 1

A method of wireless communications by a first wireless node, comprising:
identifying different patterns of phase tracking reference signal (PTRS) tones to monitor for a PTRS;
determining when to change at least one of the different patterns of the PTRS tones from one symbol of a slot to another symbol of the slot; and
monitoring for the PTRS, from a second wireless node, according to the determination.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
receiving the PTRS, from the second wireless node, on the at least one of the different patterns of PTRS tones; and
estimating filter coefficients for a de-intercarrier interference (de-ICI) filter based on the PTRS received on the at least one of the different patterns of PTRS tones.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first wireless node receives the PTRS, from the second wireless node over at least two ports of the at least one of the different patterns of PTRS tones.

### Claim 4 (depends on 1)

The method of claim 1, wherein the different patterns comprise:
one or more block PTRS patterns with at least one set of contiguous PTRS tones, or
one or more PTRS patterns with discontiguous sets of one or more PTRS tones.

### Claim 5 (depends on 1)

The method of claim 1, further comprising transmitting, to the second wireless node, a recommendation regarding the different patterns of the PTRS tones.

### Claim 6 (depends on 5)

The method of claim 5, wherein the recommendation indicates a specific mixture of at least two of the different patterns of the PTRS tones.

### Claim 7 (depends on 5)

The method of claim 5, wherein the recommendation implicitly indicates the different patterns of the PTRS tones.

### Claim 8 (depends on 7)

The method of claim 7, wherein the recommendation indicates one or more types of compensation algorithms that implicitly indicate the different patterns.

### Claim 9 (depends on 5)

The method of claim 5, wherein the recommendation indicates at least one of:
a recommended offset for each of the different patterns of the PTRS tones for use in determining a location of at least a first PTRS tone in each of the different patterns; or
a number of PTRS tones for each of the different patterns of the PTRS tones for use in determining the location of at least the first PTRS tone in each of the different patterns of the PTRS tones.

### Claim 10 (depends on 9)

The method of claim 9, wherein the recommended offset for use in determining the location of at least the first PTRS tone in each of the different patterns of PTRS tones varies from the one symbol of the slot to the other symbol of the slot.

### Claim 11 (depends on 9)

The method of claim 9, wherein, for a given symbol, the recommended offset is, at least one of:
based on a deterministic shift from the one symbol to the other symbol; or
being configured via network signaling.

### Claim 12 (depends on 5)

The method of claim 5, wherein the recommendation also indicates a filter length.

### Claim 13 (depends on 1)

The method of claim 1, wherein the determination of when to change the at least one of the different patterns of the PTRS tones is predefined or configured via network signaling.

### Claim 14 (depends on 1)

The method of claim 1, wherein at least some of the PTRS tones of one or more of the different patterns of the PTRS tones are aligned with one or more demodulation reference signal (DMRS) port tones.

### Claim 15 (depends on 1)

The method of claim 1, further comprising transmitting, to the second wireless node, a recommendation regarding a demodulation reference signal (DMRS) configuration.

### Claim 16 (depends on 15)

The method of claim 15, wherein the recommendation indicates at least one of:
subcarrier spacing (SCS) for the DMRS configuration; or
whether or not frequency division multiplexing between DMRS ports is recommended.

### Claim 17

A method of wireless communications by a first wireless node, comprising:
identifying different patterns of phase tracking reference signal (PTRS) tones for transmitting a PTRS;
determining when to change at least one of the different patterns of the PTRS tones from one symbol of a slot to another symbol of the slot; and
transmitting the PTRS, to a second wireless node, according to the determination.

### Claim 18 (depends on 17)

The method of claim 17, wherein the different patterns comprise:
one or more block PTRS patterns with at least one set of contiguous PTRS tones, or
one or more PTRS patterns with discontiguous sets of one or more PTRS tones.

### Claim 19 (depends on 17)

The method of claim 17, further comprising:
receiving, from the second wireless node, a recommendation regarding the different patterns of the PTRS tones; and
identifying the different patterns of the PTRS tones based, at least in part, on the recommendation.

### Claim 20 (depends on 19)

The method of claim 19, wherein the recommendation indicates a specific mixture of at least two of the different patterns of the PTRS tones.

### Claim 21 (depends on 19)

The method of claim 19, wherein the recommendation implicitly indicates the different patterns of the PTRS tones.

### Claim 22 (depends on 21)

The method of claim 21, wherein the recommendation indicates one or more types of compensation algorithms that implicitly indicate the different patterns of the PTRS tones.

### Claim 23 (depends on 19)

The method of claim 19, wherein the recommendation indicates at least one of:
a first recommended offset for each of the different patterns of the PTRS tones for use in determining a location of at least a first PTRS tone in each of the different patterns of the PTRS tones; or
a number of PTRS tones for each of the different patterns of the PTRS tones for use in determining the location of at least the first PTRS tone in each of the different patterns of the PTRS tones.

### Claim 24 (depends on 23)

The method of claim 23, further comprising:
determining the location of at least the first PTRS tone in each of the different patterns of the PTRS tones based, at least in part, on at least one of:
the first recommended offset for each of the different patterns of the PTRS tones; or
the number of the PTRS tones for each of the different patterns of the PTRS tones; and
wherein transmitting the PTRS, to the second wireless node, according to the determination of when to change the at least one of the different patterns of the PTRS tones from the one symbol of the slot to the other symbol of the slot comprises transmitting the PTRS on at least the first PTRS tone in each of the different patterns of the PTRS tones according to the determination of when to change the at least one of the different patterns of the PTRS tones.

### Claim 25 (depends on 24)

The method of claim 24, further comprising:
determining an association between at least the first PTRS tone in each of the different patterns of the PTRS tones and a demodulation reference signal (DMRS) port in each of the different patterns of the PTRS tones, wherein the location of at least the first PTRS tone in each of the different patterns of the PTRS tones is determined based also on the association.

### Claim 26 (depends on 25)

The method of claim 25, wherein determining the location of at least the first PTRS tone in each of the different patterns of the PTRS tones comprises aligning the first PTRS tone in each of the different patterns of the PTRS tones with a DMRS tone of the DMRS port in each of the different patterns of the PTRS tones associated with at least the first PTRS tone in each of the different patterns of the PTRS tones with a resource element (RE) index greater than or equal to the first recommended offset for each of the different patterns of the PTRS tones.

### Claim 27 (depends on 23)

The method of claim 23, wherein the first recommended offset for use in determining the location of at least the first PTRS tone in each of the different patterns of the PTRS tones varies from the one symbol of the slot to the other symbol of the slot.

### Claim 28 (depends on 23)

The method of claim 23, further comprising:
determining a location of at least a second PTRS tone in each of the different patterns of the PTRS tones based, at least in part, on the first recommended offset or a second recommended offset for each of the different patterns of the PTRS tones, wherein the determined location for the second PTRS tone in each of the different patterns of the PTRS tones is not the determined location for the first PTRS tone in each of the different patterns of the PTRS tones; and
wherein transmitting the PTRS, to the second wireless node, according to the determination of when to change the at least one of the different patterns of the PTRS tones from the one symbol of the slot to the other symbol of the slot comprises transmitting the PTRS over at least two ports on one or more PTRS tones in each of the different patterns of the PTRS tones according to the determination of when to change the at least one of the different patterns of the PTRS tones, wherein the at least two ports include the first PTRS tone over a first port and the second PTRS tone over a second port each of the different patterns of the PTRS tones, in accordance with the respective determinations.

### Claim 29

An apparatus for wireless communication by a first wireless node, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors, individually or collectively, are configured to:
identify different patterns of phase tracking reference signal (PTRS) tones for receiving a PTRS;
determine when to change at least one of the different patterns of the PTRS tones from one symbol of a slot to another of the slot; and
monitor for the PTRS, from a second wireless node, according to the determination.

### Claim 30 (depends on 29)

The apparatus of claim 29, wherein the one or more processors, individually or collectively, are further configured to:
receive the PTRS, from the second wireless node, on the at least one of the different patterns of PTRS tones; and
estimate filter coefficients for a de-intercarrier interference (de-ICI) filter based on the PTRS received on the at least one of the different patterns of PTRS tones.

### Claim 31 (depends on 30)

The apparatus of claim 30, wherein the first wireless node is configured to receive the PTRS, from the second wireless node over at least two ports of the at least one of the different patterns of PTRS tones.

### Claim 32 (depends on 29)

The apparatus of claim 29, wherein the different patterns comprise:
one or more block PTRS patterns with at least one set of contiguous PTRS tones, or
one or more PTRS patterns with discontiguous sets of one or more PTRS tones.

### Claim 33 (depends on 29)

The apparatus of claim 29, wherein the one or more processors, individually or collectively, are further configured to transmit, to the second wireless node, a recommendation regarding the different patterns of the PTRS tones.

### Claim 34 (depends on 33)

The apparatus of claim 33, wherein the recommendation indicates a specific mixture of at least two of the different patterns of the PTRS tones.

### Claim 35 (depends on 33)

The apparatus of claim 33, wherein the recommendation implicitly indicates the different patterns of the PTRS tones.

### Claim 36 (depends on 35)

The apparatus of claim 35, wherein the recommendation indicates one or more types of compensation algorithms that implicitly indicate the different patterns.

### Claim 37 (depends on 33)

The apparatus of claim 33, wherein the recommendation indicates at least one of:
a recommended offset for each of the different patterns of the PTRS tones for use in determining a location of at least a first PTRS tone in each of the different patterns; or
a number of PTRS tones for each of the different patterns of the PTRS tones for use in determining the location of at least the first PTRS tone in each of the different patterns of the PTRS tones.

### Claim 38 (depends on 37)

The apparatus of claim 37, wherein the recommended offset for use in determining the location of at least the first PTRS tone in each of the different patterns of PTRS tones varies from the one symbol of the slot to the other symbol of the slot.

### Claim 39 (depends on 37)

The apparatus of claim 37, wherein, for a given symbol, the recommended offset is, at least one of:
based on a deterministic shift from the one symbol to the other symbol; or
being configured via network signaling.

### Claim 40 (depends on 33)

The apparatus of claim 33, wherein the recommendation also indicates a filter length.

### Claim 41 (depends on 29)

The apparatus of claim 29, wherein the one or more processors, individually or collectively, are configured to determine when to change the at least one of the different patterns of the PTRS tones as predefined or configured via network signaling.

### Claim 42 (depends on 29)

The apparatus of claim 29, wherein at least some of the PTRS tones of one or more of the different patterns of the PTRS tones are aligned with one or more demodulation reference signal (DMRS) port tones.

### Claim 43 (depends on 29)

The apparatus of claim 29, wherein the one or more processors, individually or collectively, are further configured to transmit, to the second wireless node, a recommendation regarding a demodulation reference signal (DMRS) configuration.

### Claim 44 (depends on 43)

The apparatus of claim 43, wherein the recommendation indicates at least one of:
subcarrier spacing (SCS) for the DMRS configuration; or
whether or not frequency division multiplexing between DMRS ports is recommended.

### Claim 45

An apparatus for wireless communication by a first wireless node, comprising:
a memory; and
one or more processors coupled to the memory, wherein the one or more processors, individually or collectively, are configured to:
identify different patterns of phase tracking reference signal (PTRS) tones for transmitting a PTRS;
determine when to change at least one of the different patterns of the PTRS tones from one symbol of a slot to another symbol of the slot; and
transmit the PTRS, to a second wireless node, according to the determination.

### Claim 46 (depends on 45)

The apparatus of claim 45, wherein the different patterns comprise:
one or more block PTRS patterns with at least one set of contiguous PTRS tones, or
one or more PTRS patterns with discontiguous sets of one or more PTRS tones.

### Claim 47 (depends on 45)

The apparatus of claim 45, wherein the one or more processors, individually or collectively, are further configured to:
receive, from the second wireless node, a recommendation regarding the different patterns of the PTRS tones; and
identify the different patterns of the PTRS tones based, at least in part, on the recommendation.

### Claim 48 (depends on 47)

The apparatus of claim 47, wherein the recommendation indicates a specific mixture of at least two of the different patterns of the PTRS tones.

### Claim 49 (depends on 47)

The apparatus of claim 47, wherein the recommendation implicitly indicates the different patterns of the PTRS tones.

### Claim 50 (depends on 49)

The apparatus of claim 49, wherein the recommendation indicates one or more types of compensation algorithms that implicitly indicate the different patterns of the PTRS tones.