# US 12,184,569 B2 · Reference signal multiplexing with downlink data

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- Number: US 12,184,569 B2
- Document ID: US12184569B2
- Status: Granted
- Kind: B2
- Application number: 17/398,997
- Filed: 2021-08-10
- Published: 2022-10-13
- Granted: 2024-12-31
- Earliest claimed: 2021-04-09
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Mohamed Fouad Ahmed Marzban; Zhifei Fan; Hemant Saggar; Xiaoxia Zhang; Wooseok Nam; Jing Sun; Tao Luo; Ahmed Abdelaziz Ibrahim Abdelaziz Zewail; Qingjiang Tian
- Web page: https://patentgrep.com/patent/US12184569B2

## CPC

- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 27/261: {Details of reference signals}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L 27/2602: {Signal structure}
- 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: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Apparatus, methods, and computer-readable media for facilitating reference signal multiplexing with downlink data are disclosed herein. An example method for wireless communication at a user equipment (UE) includes receiving, from a base station, a reference signal configuration associated with at least one of a tracking reference signal (TRS) and a channel state information reference signal (CSI-RS), the reference signal configuration comprising a symbol level rate matching configuration, a precoder configuration, or a guard tone configuration. The example method also includes receiving, from the base station, a transmission comprising at least a reference signal and data based on the reference signal configuration.

## Claims

### Claim 1

An apparatus for wireless communication at a user equipment (UE), comprising:
memory; and
at least one processor coupled to the memory, the at least one processor configured to cause the UE to:
receive, from a base station, a reference signal configuration associated with at least one of a tracking reference signal (TRS) and a channel state information reference signal (CSI-RS), the reference signal configuration comprising a precoder configuration and a guard tone configuration indicating a presence of one or more guard tones; and
receive, from the base station, a transmission comprising at least a reference signal and data based on the reference signal configuration, wherein the transmission further includes a phase tracking reference signal (PT-RS), and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the PT-RS based on positioning of the PT-RS, wherein the positioning of the PT-RS excludes one or more symbols of the transmission including the reference signal, and wherein the positioning of the PT-RS is based on a time domain start symbol and a time domain symbol spacing for the PT-RS, wherein the time domain symbol spacing does not count the one or more symbols of the transmission including the reference signal.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the at least one processor is configured to cause the UE to:
receive the reference signal configuration via at least one of system information (SI), radio resource control (RRC) signaling, and a medium access control (MAC)-control element (MAC-CE).

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the reference signal configuration further includes a symbol level rate matching configuration, and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the reference signal in the one or more symbols of the transmission; and
perform a symbol-level de-rate matching around the one or more symbols including the reference signal.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein the transmission further includes a demodulation reference signal (DM-RS), and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the DM-RS at an adjusted symbol based on a collision in time between the DM-RS and the reference signal, the adjusted symbol occurring after a colliding symbol.

### Claim 5 (depends on 3)

The apparatus of claim 3, wherein the transmission further includes a demodulation reference signal (DM-RS), and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the reference signal in an adjusted symbol based on a collision in time between the DM-RS and the reference signal.

### Claim 6 (depends on 3)

The apparatus of claim 3, wherein to receive the transmission, the at least one processor is configured to cause the UE to:
identify the positioning of the PT-RS after performing the symbol-level de-rate matching around the one or more symbols including the reference signal.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the reference signal configuration includes the precoder configuration, the precoder configuration indicating that the reference signal and the data are both associated with a wideband precoder, and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the reference signal and the data based on the wideband precoder.

### Claim 8 (depends on 1)

The apparatus of claim 1, wherein the reference signal configuration includes the precoder configuration, the precoder configuration indicating a quantity of resource blocks (RBs) of the transmission that are associated with a same precoder, and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the reference signal and the data based on the same precoder for the quantity of RBs,
wherein a sample duration associated with the quantity of RBs satisfies a timing threshold, the sample duration calculated based on the quantity of RBs and a subcarrier spacing associated with the transmission.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the transmission includes at least one resource block including reference signal tones, data tones, and the one or more guard tones, and wherein to receive the transmission, the at least one processor is configured to cause the UE to:
receive the reference signal and the data in the at least one resource block separated by the one or more guard tones.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein the one or more guard tones are positioned adjacent to the reference signal tones of the at least one resource block between the reference signal and the data.

### Claim 11 (depends on 9)

The apparatus of claim 9, wherein the reference signal tones are associated with a wideband precoder and the data tones are associated with a subband precoder.

### Claim 12 (depends on 1)

The apparatus of claim 1, further comprising a transceiver coupled to the at least one processor.

### Claim 13

A method of wireless communication at a user equipment (UE), comprising:
receiving, from a base station, a reference signal configuration associated with at least one of a tracking reference signal (TRS) and a channel state information reference signal (CSI-RS), the reference signal configuration comprising a precoder configuration and a guard tone configuration indicating a presence of one or more guard tones; and
receiving, from the base station, a transmission comprising at least a reference signal and data based on the reference signal configuration, wherein the transmission further includes a phase tracking reference signal (PT-RS), and wherein receiving the transmission comprises:
receiving the PT-RS based on positioning of the PT-RS, wherein the positioning of the PT-RS excludes one or more symbols of the transmission including the reference signal, and wherein the positioning of the PT-RS is based on a time domain start symbol and a time domain symbol spacing for the PT-RS, wherein the time domain symbol spacing does not count the one or more symbols of the transmission including the reference signal.

### Claim 14 (depends on 13)

The method of claim 13, wherein the UE receives the reference signal configuration via at least one of system information (SI), radio resource control (RRC) signaling, and a medium access control (MAC)-control element (MAC-CE).

### Claim 15 (depends on 13)

The method of claim 13, wherein the reference signal configuration further includes a symbol level rate matching configuration, and wherein receiving the transmission comprises:
receiving the reference signal in the one or more symbols of the transmission; and
performing a symbol-level de-rate matching around the one or more symbols including the reference signal.

### Claim 16 (depends on 13)

The method of claim 13, wherein the reference signal configuration includes the precoder configuration, the precoder configuration indicating that the reference signal and the data are both associated with a wideband precoder, and wherein receiving the transmission comprises:
receiving the reference signal and the data based on the wideband precoder.

### Claim 17 (depends on 13)

The method of claim 13, wherein the reference signal configuration includes the precoder configuration, the precoder configuration indicating a quantity of resource blocks (RBs) of the transmission that are associated with a same precoder, and wherein receiving the transmission comprises:
receiving the reference signal and the data based on the same precoder for the quantity of RBs,
wherein a sample duration associated with the quantity of RBs satisfies a timing threshold, the sample duration calculated based on the quantity of RBs and a subcarrier spacing associated with the transmission.

### Claim 18 (depends on 13)

The method of claim 13, wherein the transmission includes at least one resource block including reference signal tones, data tones, and the one or more guard tones, and wherein receiving the transmission comprises:
receiving the reference signal and the data in the at least one resource block separated by the one or more guard tones.

### Claim 19

An apparatus for wireless communication at a base station, comprising:
memory; and
at least one processor coupled to the memory, the at least one processor configured to cause the base station to:
transmit, to a user equipment (UE), a reference signal configuration associated with at least one of a tracking reference signal (TRS) and a channel state information reference signal (CSI-RS), the reference signal configuration comprising a precoder configuration and a guard tone configuration indicating a presence of one or more guard tones; and
transmit a transmission including at least a reference signal and data based on the reference signal configuration, wherein the transmission further includes a phase tracking reference signal (PT-RS), and wherein to transmit the transmission, the at least one processor is configured to cause the base station to:
transmit the PT-RS based on positioning of the PT-RS, wherein the positioning of the PT-RS excludes one or more symbols of the transmission including the reference signal, and wherein the positioning of the PT-RS is based on a time domain start symbol and a time domain symbol spacing for the PT-RS, wherein the time domain symbol spacing does not count the one or more symbols of the transmission including the reference signal.

### Claim 20 (depends on 19)

The apparatus of claim 19, wherein the at least one processor configured to cause the base station to:
transmit the reference signal configuration via at least one of system information (SI), radio resource control (RRC) signaling, and a medium access control (MAC)-control element (MAC-CE).

### Claim 21 (depends on 19)

The apparatus of claim 19, wherein the reference signal configuration further includes a symbol level rate matching configuration, the at least one processor further configured to cause the base station to:
transmit the reference signal in the one or more symbols of the transmission; and
perform a symbol-level rate matching of the data around the one or more symbols including the reference signal.

### Claim 22 (depends on 19)

The apparatus of claim 19, wherein the reference signal configuration includes the precoder configuration, the at least one processor further configured to cause the base station to:
applying a wideband precoder to the reference signal and the data.

### Claim 23 (depends on 19)

The apparatus of claim 19, wherein the reference signal configuration includes the precoder configuration, the precoder configuration indicating a quantity of resource blocks (RBs) of the transmission that are associated with a same precoder, and a sample duration associated with the quantity of RBs satisfies a timing threshold, the sample duration calculated based on the quantity of RBs and a subcarrier spacing associated with the transmission.

### Claim 24 (depends on 19)

The apparatus of claim 19, wherein the at least one processor further configured to cause the base station to:
transmit reference signal tones, data tones, and the one or more guard tones in a resource block.

### Claim 25

A method of wireless communication at a base station, comprising:
transmitting, to a user equipment (UE), a reference signal configuration associated with at least one of a tracking reference signal (TRS) and a channel state information reference signal (CSI-RS), the reference signal configuration comprising a precoder configuration and a guard tone configuration indicating a presence of one or more guard tones; and
transmitting a transmission including at least a reference signal and data based on the reference signal configuration, wherein the transmission further includes a phase tracking reference signal (PT-RS), and wherein transmitting the transmission comprises:
transmitting the PT-RS based on positioning of the PT-RS, wherein the positioning of the PT-RS excludes one or more symbols of the transmission including the reference signal, and wherein the positioning of the PT-RS is based on a time domain start symbol and a time domain symbol spacing for the PT-RS, wherein the time domain symbol spacing does not count the one or more symbols of the transmission including the reference signal.

### Claim 26 (depends on 25)

The method of claim 25, wherein the base station transmits the reference signal configuration via at least one of system information (SI), radio resource control (RRC) signaling, and a medium access control (MAC)-control element (MAC-CE).

### Claim 27 (depends on 25)

The method of claim 25, wherein the reference signal configuration further includes a symbol level rate matching configuration, the method further comprising:
transmitting the reference signal in the one or more symbols of the transmission; and
performing a symbol-level rate matching of the data around the one or more symbols including the reference signal.

### Claim 28 (depends on 25)

The method of claim 25, wherein the reference signal configuration includes the precoder configuration, the method further comprising:
applying a wideband precoder to the reference signal and the data.

### Claim 29 (depends on 25)

The method of claim 25, wherein the reference signal configuration includes the precoder configuration, the precoder configuration indicating a quantity of resource blocks (RBs) of the transmission that are associated with a same precoder, and a sample duration associated with the quantity of RBs satisfies a timing threshold, the sample duration calculated based on the quantity of RBs and a subcarrier spacing associated with the transmission.

### Claim 30 (depends on 25)

The method of claim 25, further comprising:
transmitting reference signal tones, data tones, and the one or more guard tones in a resource block.