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US007925263B2
(12) United States Patent ao) Patent No.: Us 7,925,263 B2
Zaki (45) Date of Patent: * Apr. 12, 2011
(54) HANDOVER IN A WIRELESS LOCAL AREA NETWORK (WLAN)
(75) Inventor: Maged Zaki, Pierrefonds (CA)
(73) Assignee: InterDigital Technology Corporation,
Wilmington, DE (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
This patent is subject to a terminal disclaimer.
(21) Appl.No.: 11/652,271
(22) Filed: Jan. 11, 2007
(65) Prior Publication Data
US 2007/0111731 Al May 17, 2007
Related U.S. Application Data
(63) Continuation of application No. 10/931,112, filed on Aug. 31, 2004, now Pat. No. 7,164,915.
(60) Provisional application No. 60/531,513, filed on Dec. 19, 2003.
(51) Int. CI.
H04W36/00 (2009.01)
(52) U.S. CI 455/436
(58) Field of Classification Search 455/437,
455/452.2, 525 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
5,640,677 A * 6/1997 Karlsson 455/434
(Continued)
FOREIGN PATENT DOCUMENTS EP 1 182 902 2/2002
(Continued)
OTHER PUBLICATIONS
802.11 Working Group of the 802 Committee, IEEEP802.1 ln/Dl.0; Draft Amendment to Standard [FOR] Information Technology-Telecommunications and Information Exchange Between Systems-Local and Metropolitan Networks-Specific Requriements-Part 11: Wirelesss LAN Medium Access Control {MAC) and Physical Layer (PHY) Specifications: Enhancments for Higher Throughput, IEEE P802.11n/D1.0 (Mar. 2006).
Primary Examiner — Dwayne D Bost Assistant Examiner — Timothy Pham (74) Attorney, Agent, or Firm — Volpe And Koenig, PC.
In triggering a handoff by a wireless transmit/receive unit (WTRU) from a current basic service set (BSS) in a wireless local area network (WLAN), the following are performed. A highest class of traffic service and quality of service (QoS) is determined for the highest class from a basic service set (BSS) beacon. Handoff is terminated and communication is retained with a current BSS when the signal to noise ratio (SNR) or received signal strength (RSS) is greater than a high threshold of the highest class. Other criteria is evaluated to determine whether a handoff is desired when the SNR or RSS is less than the high threshold.
3 Claims, 4 Drawing Sheets
