# US 12,114,273 B2 · Dynamic timing adjustment for new radio integrated access and backhaul node

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- Number: US 12,114,273 B2
- Document ID: US12114273B2
- Status: Granted
- Kind: B2
- Application number: 18/055,376
- Filed: 2022-11-14
- Published: 2023-05-18
- Granted: 2024-10-08
- Earliest claimed: 2018-08-17
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Wooseok Nam; Tao Luo; Junyi Li
- Web page: https://patentgrep.com/patent/US12114273B2

## CPC

- H04W 56/0005: {synchronizing of arrival of multiple uplinks}
- H04B 7/15557: {Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode}
- H04L 27/2656: {Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation}
- H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length}
- H04W 56/001: {Synchronization between nodes}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04W 74/04: Scheduled access (hybrid access H04W74/02)
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 84/047: {using dedicated repeater stations}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Aspects of the present disclosure provide techniques for dynamically adjusting the access link timing alignment at the integrated access and backhaul (IAB) node. Specifically, features of the present disclosure provide techniques for signaling to one or more child nodes the timing advance and timing offset values associated with each operational mode of the IAB node that may impact the access link timing for the child node (for uplink and/or downlink transmissions). Additionally or alternatively, aspects of the present disclosure identify whether a gap period may be included in order to ensure that the child node has sufficient time to transition between states during the transition period (e.g., from downlink to uplink) when the IAB node dynamically adjusts the access link timing.

## Claims

### Claim 1

An integrated access and backhaul (IAB) node for wireless communication comprising:
a memory; and
a processor coupled to the memory, wherein the processor is configured to:
receive a timing offset value;
operate in an operational mode, wherein the operational mode is a first operational mode or a second operational mode, wherein the first operational mode is associated with a first access link timing and the second operational mode is associated with a second access link timing; and
transmit, to a child node, a timing indication indicative of timing advance value, wherein the timing advance value is based on the timing offset value and the operational mode.

### Claim 2 (depends on 1)

The IAB node of claim 1, wherein the timing advance value is based on a propagation delay between the IAB node and a parent node.

### Claim 3 (depends on 1)

The IAB node of claim 1, wherein the timing advance value is based on a sum of a first propagation time for first data to be transmitted from the IAB node to a parent node and a second propagation time for second data to be transmitted from the parent node to the IAB node.

### Claim 4 (depends on 1)

The IAB node of claim 1, wherein the timing offset value is associated with at least one of an uplink-to-downlink switching latency of a parent node, a downlink-to-uplink switching latency of the parent node, or a hardware impairment of the parent node.

### Claim 5 (depends on 1)

The IAB node of claim 1, wherein, to receive the timing offset value, the processor is configured to receive the timing offset value from a parent node via radio resource control (RRC) configuration or media access control (MAC) control element (MAC-CE) signaling.

### Claim 6 (depends on 1)

The IAB node of claim 1, wherein the IAB node includes both a base station type functionality that allows for transmission and reception to and from the child node, and a UE-type functionality that allows for transmission and reception to and from a parent node.

### Claim 7 (depends on 1)

The IAB node of claim 1, wherein the child node is a user equipment (UE) or another IAB node.

### Claim 8

A method of wireless communication performed by an integrated access and backhaul (IAB) node, the method comprising:
receiving a timing offset value;
operating in an operational mode, wherein the operational mode is a first operational mode or a second operational mode, wherein the first operational mode is associated with a first access link timing and the second operational mode is associated with a second access link timing; and
transmitting, to a child node, a timing indication indicative of timing advance value, wherein the timing advance value is based on the timing offset value and the operational mode.

### Claim 9 (depends on 8)

The method of claim 8, wherein the timing advance value is based on a propagation delay between the IAB node and a parent node.

### Claim 10 (depends on 8)

The method of claim 8, wherein the timing advance value is based on a sum of a first propagation time for first data to be transmitted from the IAB node to a parent node and a second propagation time for second data to be transmitted from the parent node to the IAB node.

### Claim 11 (depends on 8)

The method of claim 8, wherein the timing offset value is associated with at least one of an uplink-to-downlink switching latency of a parent node, a downlink-to-uplink switching latency of the parent node, or a hardware impairment of the parent node.

### Claim 12 (depends on 8)

The method of claim 8, wherein receiving the timing offset value comprises receive the timing offset value from a parent node via radio resource control (RRC) configuration or media access control (MAC) control element (MAC-CE) signaling.

### Claim 13 (depends on 8)

The method of claim 8, wherein the IAB node includes both a base station type functionality that allows for transmission and reception to and from the child node, and a UE-type functionality that allows for transmission and reception to and from a parent node.

### Claim 14 (depends on 8)

The method of claim 8, wherein the child node is a user equipment (UE) or another IAB node.

### Claim 15

A non-transitory computer readable storage medium having stored thereon instructions that, when executed, cause a processor of an integrated access and backhaul (IAB) node to:
receive a timing offset value;
operate the IAB node in an operational mode, wherein the operational mode is a first operational mode or a second operational mode, wherein the first operational mode is associated with a first access link timing and the second operational mode is associated with a second access link timing; and
transmit, to a child node, a timing indication indicative of timing advance value, wherein the timing advance value is based on the timing offset value and the operational mode.

### Claim 16 (depends on 15)

The non-transitory computer-readable storage medium of claim 15, wherein the timing advance value is based on a propagation delay between the IAB node and a parent node.

### Claim 17 (depends on 15)

The non-transitory computer-readable storage medium of claim 15, wherein the timing advance value is based on a sum of a first propagation time for first data to be transmitted from the IAB node to a parent node and a second propagation time for second data to be transmitted from the parent node to the IAB node.

### Claim 18 (depends on 15)

The non-transitory computer-readable storage medium of claim 15, wherein the timing offset value is associated with at least one of an uplink-to-downlink switching latency of a parent node, a downlink-to-uplink switching latency of the parent node, or a hardware impairment of the parent node.

### Claim 19 (depends on 15)

The non-transitory computer-readable storage medium of claim 15, wherein the instructions that cause the processor to receive the timing offset value comprise instructions that cause the processor to receive the timing offset value from a parent node via radio resource control (RRC) configuration or media access control (MAC) control element (MAC-CE) signaling.

### Claim 20 (depends on 15)

The non-transitory computer-readable storage medium of claim 15, wherein the IAB node includes both a base station type functionality that allows for transmission and reception to and from the child node, and a UE-type functionality that allows for transmission and reception to and from a parent node.

### Claim 21 (depends on 15)

The non-transitory computer-readable storage medium of claim 15, wherein the child node is a user equipment (UE) or another IAB node.