# US 12,764,680 B2 · Apparatus and method for establishing uplink synchronization in a wireless communication system

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- Number: US 12,764,680 B2
- Document ID: US12764680B2
- Status: Granted
- Kind: B2
- Application number: 18/136,253
- Filed: 2023-04-18
- Published: 2023-08-10
- Granted: 2026-10-13
- Earliest claimed: 2010-02-10
- Assignees: Pantech Co., Ltd.
- Applicants: Pantech Corporation
- Inventors: Kibum Kwon; Myungcheul Jung
- Web page: https://patentgrep.com/patent/US12764680B2

## CPC

- H04W 56/0005: {synchronizing of arrival of multiple uplinks}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04W 74/004: {in the uplink, i.e. towards network}
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04B 1/7087: Carrier synchronisation aspects
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 88/08: Access point devices
- H04W 92/10: between terminal device and access point, i.e. wireless air interface
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

Uplink synchronization establishment in a base station which operates a plurality of component carriers according to one embodiment of the present description, is performed in that the base station is connected to a user equipment, sets component carrier aggregation information, generates an uplink timing groups in the set component carrier aggregation, and transmits information on the thus-generated uplink timing groups to the user equipment.

## Claims

### Claim 1

A communication method for a user equipment (UE) comprising:
receiving, from a base station, a Radio Resource Control (RRC) message through a primary Component Carrier (CC), wherein the primary CC belongs to a first uplink (UL) timing group, the RRC message comprises information related to a second UL timing group, and the second UL timing group includes a secondary CC;
receiving, from the base station, information indicating a random access preamble;
transmitting, to the base station, the random access preamble according to a non-contention selection, through a selected CC among the second UL timing group;
receiving, from the base station, a random access response through the primary CC, the random access response including a Timing Advanced (TA) value for the second UL timing group in response to the transmitted the random access preamble, together with UL grant information for the UE; and
applying the TA value to the secondary CC belonging to the second UL timing group.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the selected CC is selected by the base station.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the TA value for the second UL timing group is based on the transmitted random access preamble through the selected CC.

### Claim 4

A communication apparatus for a user equipment (UE) comprising:
a memory; and
a processor operably couped to the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to cause the apparatus to:
receive, from a base station, a Radio Resource Control (RRC) message through a primary Component Carrier (CC), wherein the primary CC belongs to a first uplink (UL) timing group, the RRC message comprises information related to a second UL timing group, and the second UL timing group includes a secondary CC;
receive, from the base station, information indicating a random access preamble;
transmit, to the base station, the random access preamble according to a non-contention selection, through a selected CC among the second UL timing group;
receive, from the base station, a random access response through the primary CC, the random access response including a Timing Advanced (TA) value for the second UL timing group in response to the transmitted the random access preamble, together with UL grant information for the UE; and
apply the TA value to the secondary CC belonging to the second UL timing group.

### Claim 5 (depends on 4)

The communication apparatus of claim 4,
wherein the selected CC is selected by the base station.

### Claim 6 (depends on 4)

The communication apparatus of claim 4,
wherein the TA value for the second UL timing group is based on the transmitted random access preamble through the selected CC.