Hierarchical communication system using premises, peripheral and

Details Hierarchical communication system using premises, peripheral and Hierarchical communication system using premises, peripheral and

1994-07-22

1997-08-12

Kizou, Hassan

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

375200, 3408255, 455 383, 455433, H04B 726, H04B 7216

Patent

active

056573170

ABSTRACT:
A hierarchical communication system is described in which wireless local area networks (LANs) exhibiting substantially different characteristics are employed in an overall scheme to link portable or mobile computing devices. In a premises LAN, a series of radio base stations and a backbone LAN make up an infrastructure network. The infrastructure network and at least one mobile computing device make up a higher-power LAN, utilizing a frequency hopping protocol. A lower-power LAN allows for radio communication between a mobile computing device and peripheral devices, utilizing a single-frequency spread spectrum protocol. A vehicular LAN provides for short-range communication between a vehicle terminal and a portable terminal. When out of direct RF range of the premises LAN, the vehicle terminal maintains indirect communication when necessary with the premises LAN via one of several alternate RF channels. A microprocessor, located inside radio units which participate in multiple LAN's, selects the appropriate protocol, frequency band and power level for communicating through the network.

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patent: 5029183 (1991-07-01), Tymes
patent: 5241542 (1993-08-01), Natarajan et al.
patent: 5289378 (1994-02-01), Miller et al.
patent: 5339316 (1994-08-01), Diepstraten

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