Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system
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United States of America Patent
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Sep 16, 2008
Grant Date -
Nov 29, 2007
app pub date -
Jan 11, 2007
filing date -
Mar 5, 1992
priority date (Note) -
Expired
status (Latency Note)
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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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