Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-12-02
2000-05-09
Holloway, III, Edwin C.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
455440, H04Q 722
Patent
active
060613378
ABSTRACT:
A system and method for measuring the approximate distance and direction of a mobile unit from a plurality of cells in order to determine whether and how to handoff the mobile unit and which cell may be the best serving cell. The CDMA timing system is used to provide an estimate of the subscriber's location to be determined by a CDMA base station. A distance calculation is made by the serving cell site sending a request for signal strength message to a mobile unit. The mobile unit measures pilot signal strength and a time offset from the expected time of such pilot signals. The signal strength and time offsets are returned to the cell site. a processor in the system can then determine if a handoff is really desirable, and with which of the cell sites is the best serving all for the mobile unit the mobile unit with a high degree of confidence that the call will be maintained. Also, an adaptive database may be implemented wherein a mobile unit is tracked to the edge of the coverage area and, a database is kept of successful handoffs to another carrier.
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Light Jeffrey Ross
Liu Chung-Zin
Varvaro Charles
Holloway III Edwin C.
Johannesen Michael B.
Lucent Technologies - Inc.
Ormos Neil R.
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