Method and apparatus for handoff within a communication system

Details Method and apparatus for handoff within a communication system Method and apparatus for handoff within a communication system

1997-10-31

2000-08-08

Kizou, Hassan

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370350, 375367, 455436, H04J 306, H04L 700

Patent

active

061011754

ABSTRACT:
In a communication system (100) where a remote unit is given a time offset for a base station (102) and hands off to the base station (102) if the remote unit (113) can acquire the base station within a time window surrounding the time offset, a remote unit (113) utilizes the time offset of each base station (supplied by a serving base station (101) via a downlink communication signal (116) and searches for neighboring base stations within the time window surrounding its PN offset. The time window surrounding an individual base station's PN offset is allowed to vary depending upon whether the communication system (100) is time synchronized. In particular, a base station (101) supplies the remote unit (113) with an indication that the communication system (100) is operating in a synchronized or an unsynchronized mode, and the remote unit (113) varies the time window (search window) accordingly.

REFERENCES:
patent: 5561838 (1996-10-01), Chandos et al.
patent: 5586119 (1996-12-01), Scribano et al.
patent: 5640679 (1997-06-01), Lundquist et al.
patent: 5825835 (1998-10-01), Kingston et al.
patent: 5828659 (1998-10-01), Teder et al.
patent: 5907813 (1999-05-01), Johnson, Jr. et al.
"Personal Station-Base Station Compatibility Requirements for 1.8 to 2.0 GHz Code Division Multiple Access (CDMA) Personal Communication Systems" (American National Standards Institute (ANSI) J-STD-008), pp. 1-19 to 1-21, 2-54 to 2-55, 2-224 to 2-226, 3-126 to 3-131.
GSM Recommendation 05.10 pp. 1-6.

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