Multiplex communications – Wide area network – Packet switching
Patent
1993-07-14
1995-10-17
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 951, 370 857, 455 561, H04B 724, H04Q 720, H04Q 730
Patent
active
054597277
ABSTRACT:
The present invention overcomes the prior art limitations by dividing a coverage area into very small regions or cells. The inventive system can be built as an adjunct to a wired telecommunication system such as a PBX. Advantageously, because of the relatively small size of each cell, transceivers in the inventive system can use very low transmission power, compared with a pico-cellular communications system, to communicate with a fixed transceiver. In addition, because of the relatively short distance between the mobile handset and the fixed transceiver, the communication paths between any two transceivers are reduced and, therefore, the multipath distortion which can affect the received signals is substantially reduced.
A concomitant problem normally associated with relatively small cells is the need for a switching system which can accommodate the large amount of switching or handovers required to accommodate the various mobile units as they move from one cell to another. In accordance with the present invention, this problem is solved by a switching technique which is not centralized in the PBX but, rather, is effectively distributed among the individual fixed-call terminals.
REFERENCES:
patent: 4238740 (1980-12-01), Crue
patent: 5131007 (1992-07-01), Brown et al.
patent: 5164942 (1992-11-01), Kamerman et al.
D. Akerber, "Properties of a TDMA Pico Cellular Office Communication System," 39th IEEE Veh. Tech. Conf., San Francisco, Calif. (May 1988), pp. 186-191.
AT&T IPM Corp.
Chin Wellington
Padnes David R.
Skarlatos Nicholas J.
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