Multiplex communications – Communication over free space – Message addressed to multiple destinations
Patent
1996-03-29
1997-11-25
Kizou, Hassan
Multiplex communications
Communication over free space
Message addressed to multiple destinations
370342, 370345, 370445, 455 491, 375202, H04J 400, H04B 1713
Patent
active
056919794
ABSTRACT:
A signaling protocol for an infrastructureless short range communication system uses slow frequency hopping compatible with the industrial/scientific/medical (ISM) frequency spectrum. The signaling protocol utilizes a multi-tiered structure having an acknowledgment request frame (200), ping frame (300), connect frame (400) and voice frame (500). These frames are used to determine an appropriate allocation of frequency spectrum from an initiating station (11') to at least one other non-initiating station (11). The signaling protocol allows an initiating station (11') to rapidly identify other stations (11) within a talk group (13) and resolve actual and/or potential collisions to establish clear and reliable infrastructureless communication.
REFERENCES:
patent: 5379290 (1995-01-01), Klejine
patent: 5404374 (1995-04-01), Mullins et al.
patent: 5422952 (1995-06-01), Kennedy et al.
patent: 5471503 (1995-11-01), Altmaier et al.
IEEE Transactions on Vehicular Technology, vol. 41, No. 1 Feb. 1992, pp. 24-34.
Cadd Jimmy W.
Fulghum Tracy L.
Kizou Hassan
Motorola Inc.
Scutch, III Frank M.
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