Wireless network access scheme

Details Wireless network access scheme Wireless network access scheme

1995-10-13

1998-02-24

Olms, Douglas W.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370448, 370913, 455 331, H04Q 738

Patent

active

057217335

ABSTRACT:
A network access scheme enhances channel utilization under the ALOHA protocol by making use of the FM capture effect. The resulting network access scheme allows a transmitter to transmit a message simultaneously with other transmitters to a receiver without the need for retransmission when the message reaches the receiver with sufficient strength over the strengths of the other transmissions. In one embodiment, the network access scheme is applied to a wireless data network, which includes support to a two-way paging application. Another network access scheme combines the high channel utilization of the carrier sensing multi-access (CSMA) protocol with the FM capture effect to provide even higher expected channel utilization. The resulting network access scheme uses a channel access protocol ("CSMA/AT") which provides an adaptive threshold. An RF transmitter determines, using the adaptive threshold, whether or not to transmit its message. Under CSMA/AT, if the sensed power of other transmissions (RSSI) in the channel is below the adaptive threshold, the transmitter transmits; otherwise, the transmitter backs off.

REFERENCES:
patent: 5148473 (1992-09-01), Freeland et al.
patent: 5276680 (1994-01-01), Messenger
patent: 5463672 (1995-10-01), Kage
Zdunek et al., "Multiple channel inhibit multiple access eith capture," IEEE Globecom 91 Conf., pp. 536-542, 1991.
Mehrotra, "Cellular Radio: Analog and Digital Systems," Artech House, p. 18 and pp. 24-27, 1994.
Stallings, "Data and Computer Communications," 2nd ed., Macmillan, pp. 296-300, 1988.

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