Frequency hopping spread spectrum data communications system

Details Frequency hopping spread spectrum data communications system Frequency hopping spread spectrum data communications system

1992-10-15

1994-02-15

Cain, David C.

Pulse or digital communications

Repeaters

Testing

380 48, H04L 900

Patent

active

052873846

ABSTRACT:
A frequency hopping spread spectrum wireless data communications network is disclosed. Time mark frames are transmitted by each base station at a regular cadence and each time mark frame contains all information necessary to determine the hopping sequence of channels, a sub-set of possible channels in use, and the particular channel upon which the time mark was transmitted. Receipt of the time mark resynchronizes a slot clock that is used by the wireless terminals in implementing a media access protocol with defined synchronous time slots. The base station to roaming terminal radio link is half duplex. Each base station broadcasts an end-of-message frame during a hop period that indicates that it has no more data to send during that hop. If there are no inbound messages a roaming terminal needs to send, it puts its receiver in a low power mode until the next hop time approaches. Look ahead acquisition of the hopping sequence for a nearby base station when the received signal level for the current base station drops is also disclosed.

REFERENCES:
patent: 4575842 (1986-03-01), Katz et al.
patent: 4701911 (1987-10-01), Ulug
patent: 4709365 (1987-11-01), Beale et al.
patent: 5095480 (1992-03-01), Fenner
patent: 5121382 (1992-06-01), Yang et al.
patent: 5123029 (1992-06-01), Bantz et al.
IBM Thomas J. Watson Research Center, Medium Access Control Protocol for Wireless LANs, (An Update) Mar. 9, 1992.

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