Hybrid DSMA/CDMA (digital sense multiple access/code division multiple access) method with collision resolution for packet communications
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United States of America Patent
Stats
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Jul 11, 2006
Grant Date -
Apr 29, 2004
app pub date -
Oct 14, 2003
filing date -
Oct 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hybrid DSMA-CR/CDMA methodology provides efficient access to one of a group of packet channels in a spread spectrum wireless communication network. The base station broadcasts status information as to the availability and/or available data rates for each packet channel or group of channels. Each mobile station uses the status information to select an available channel and/or a channel with sufficient data rate. The mobile station then starts transmission of a series of access preambles, each of which contains a signature corresponding to the selected channel. The mobile station transmits the preambles at increasing power levels. When the base station detects a preamble transmission, the base station responds with a corresponding acknowledgement essentially permitting the mobile station to send its packet data along with any closed-loop power control information over the selected channel.
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