Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1997-10-02
1999-12-21
Patel, Ajit
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370448, 370913, H04Q 700
Patent
active
060058536
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.
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Lii Dzung-Ji
Wang Weijia
Cook Carmen C.
GWcom, Inc.
Kwok Edward C.
Patel Ajit
Phunkulh Bob A.
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