United States Patent 9,900,857
Wang , et al. February 20, 2018
Method and apparatus for maintaining uplink synchronization and reducing battery power consumption
Abstract
A Node-B sends a polling message to a wireless transmit/receive unit (WTRU). The WTRU sends an uplink synchronization burst in response to the polling message without contention. The Node-B estimates an uplink timing shift based on the synchronization burst and sends an uplink timing adjustment command to the WTRU. The WTRU then adjusts uplink timing based on the uplink timing adjustment command. Alternatively, the Node-B may send a scheduling message for uplink synchronization to the WTRU. The WTRU may send a synchronization burst based on the scheduling message. Alternatively, the WTRU may perform contention-based uplink synchronization after receiving a synchronization request from the Node-B. The WTRU may enter an idle state instead of performing a handover to a new cell when the WTRU moves to the new cell. A discontinuous reception (DRX) interval for the WTRU may be set based on activity of the WTRU.
Inventors:
Wang; Jin (Princeton, NJ), Chen; John S. (Ann Arbor Township, MI), Sammour; Mohammed (Alrabieh-Amman, JO), Terry; Stephen E. (Northport, NY), Chandra; Arty (Manhasset Hills, NY), Zhang; Guodong (Syosset, NY)
Applicant:
Name
City
State
Country
Type
INTERDIGITAL TECHNOLOGY CORPORATION
Wilmington
DE
US
Assignee:
InterDigital Technology Corporation (Wilmington, DE)
Family ID:
1000003134498
Appl. No.:
14/848,507
Filed:
September 9, 2015
Prior Publication Data
Document Identifier
Publication Date
US 20150382317 A1 Dec 31, 2015
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
11689771 Mar 22, 2007 9167546
60785491 Mar 24, 2006
Current U.S. Class: 1/1
Current CPC Class: H04W 56/0045 (20130101); H04J 11/0069 (20130101); H04W 52/0216 (20130101); H04W 72/0413 (20130101); H04W 92/10 (20130101); Y02D 70/24 (20180101); Y02D 70/1244 (20180101); Y02D 70/1262 (20180101); Y02D 70/142 (20180101); Y02D 70/144 (20180101); Y02D 70/00 (20180101)
Current International Class: H04W 56/00 (20090101); H04J 11/00 (20060101); H04W 52/02 (20090101); H04W 72/04 (20090101); H04W 92/10 (20090101)
PPP
"Intellectuals solve problems; geniuses prevent them." - Albert Einstein
