Multiplex communications – Communication over free space – Repeater
Reexamination Certificate
2011-03-22
2011-03-22
Cho, Un C (Department: 2617)
Multiplex communications
Communication over free space
Repeater
C370S331000, C370S350000, C455S525000
Reexamination Certificate
active
07911993
ABSTRACT:
Method and apparatus for base stations and subscriber units allows soft handoff of a CDMA reverse link utilizing an orthogonal channel structure. Subscriber units transmit an orthogonally coded signal over a reverse link to the base stations. A given base station provides timing control of the timing offset of the reverse link signal. Based on at least one criterion, an alignment controller determines that the given base station should hand off timing control to another base station, and a soft handoff process ensues. In response to a command or message for soft handoff of the subscriber unit from the given base station to another base station, the subscriber unit makes a coarse timing adjustment to the timing of the coded signal. The subscriber unit may make fine timing adjustments based on feedback from the base station controlling timing. Multiple base stations may provide power control feedback to the subscriber unit.
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Nee Van R D J: “Timing Aspects of Synchronous CDMA” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 1994, pp. 439-443, XP000619815, * p. 439-p. 440*.
Alapuranen Pertti O.
Proctor, Jr. James A.
Cho Un C
Eng George
IPR Licensing Inc.
Volpe and Koenig P.C.
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