Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-01-11
2008-09-16
Vuong, Quochien B (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S450000, C370S515000, C375S145000
Reexamination Certificate
active
07426391
ABSTRACT:
Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence.
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Padovani Roberto
Tiedemann Jr. Edward G.
Weaver, Jr. Lindsay A.
Beladi S. Hossain
Moskowitz Larry J.
Qualcomm Incorporated
Rouse Thomas
Vuong Quochien B
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