Broadcast-initiated bipartite frame multi-access protocol
First Claim
Patent Images
1. An indoor digital data radio communication system comprising:
- a plurality of remote stations each including a spread spectrum radio frequency transceiver; and
a computer system including a base station having a spread spectrum radio frequency transceiver, said base station transceiver includingmeans for defining a plurality of frames during which messages and data are transmitted over a radio channel, each of said frames being demarcated into two intervals, one for controlled access by the base station and one for contention access by the remote stations, andmeans for varying said two intervals depending on message traffic load of the system.
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Abstract
A hybrid of controlled access and random access schemes using frequency hopping spread spectrum communication techniques is implemented in an indoor digital data radio communication system between mobile stations and a computer system. A hop in the frequency hopping spread spectrum communication system is subdivided into two intervals so that different media-access protocols can be used in each interval. The protocol uses a centralized control scheme in one interval and a decentralized scheme in the other, and the intervals may be varied depending on the load of the system.
188 Citations
14 Claims
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1. An indoor digital data radio communication system comprising:
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a plurality of remote stations each including a spread spectrum radio frequency transceiver; and a computer system including a base station having a spread spectrum radio frequency transceiver, said base station transceiver including means for defining a plurality of frames during which messages and data are transmitted over a radio channel, each of said frames being demarcated into two intervals, one for controlled access by the base station and one for contention access by the remote stations, and means for varying said two intervals depending on message traffic load of the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for indoor digital data radio communication between a plurality of remote stations each including a spread spectrum radio frequency transceiver and a computer system including a base station having a spread spectrum radio frequency transceiver, said method performed by said base station and comprising the steps of:
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defining a plurality of frames during which messages and data are transmitted over a radio channel, each of said frames being demarcated into two intervals, one for controlled access by the base station and one for contention access by the remote stations, and varying said two intervals depending on message traffic load of the system. - View Dependent Claims (11, 12, 13, 14)
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Specification