Method of timing reference management

• US 9,191,868 B2
• Filed: 09/02/2014
• Issued: 11/17/2015
• Est. Priority Date: 02/08/2012
• Status: Active Grant

• Current Assignee: Acer, Inc.
• Original Assignee: Acer, Inc.
• Inventors: Ye, Shiang-Rung
• Primary Examiner(s): CHAN, SAI MING
• Application Number:
  US14/474,323
• Publication Number:
  US 20140369317A1
• Time in Patent Office: 441 Days
• Field of Search: 370/331, 370/336, 370/350
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of timing reference management for a mobile device in a wireless communication system comprising a network is disclosed. The method comprises being configured a first cell of a timing advance group, as a timing reference cell of the timing advance group; and when the timing reference cell is changed from the first cell to a second cell of the timing advance group and a timing alignment timer applied for the timing advance group for uplink transmission synchronization is running, deriving a new uplink transmission timing according to a second timing adjust value; wherein the second timing adjust value is calculated according to a first downlink timing of the first cell, a second downlink timing of the second cell, and a first timing adjust value for deriving the uplink transmission timing when the timing reference cell is the first cell.

Claims

1. A method of timing reference management for a mobile device in a wireless communication system comprising a network, the method comprising:

being configured as a first cell of a timing advance group, in which cells have the same uplink timing, as a timing reference cell of the timing advance group, wherein a downlink timing of the timing reference cell is used for deriving an uplink transmission timing; and

when the timing reference cell is changed from the first cell to a second cell of the timing advance group and a timing alignment timer applied for the timing advance group for uplink transmission synchronization is running, deriving a new uplink transmission timing according to a second downlink timing of the second cell;

adjusting from the uplink transmission timing associated to the first cell to the new uplink transmission timing associated to the second cell.

2. The method of claim 1, wherein the adjusting step comprises:

adjusting from the uplink transmission timing associated to the first cell to the new uplink transmission timing associated to the second cell at once.

3. The method of claim 1, wherein the adjusting step comprises:

adjusting from the uplink transmission timing associated to the first cell to the new uplink transmission timing associated to the second cell gradually.