The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1998
Filed:
Oct. 13, 1995
Weijia Wang, Sunnyvale, CA (US);
Dzung-Ji Lii, Santa Clara, CA (US);
General Wireless Communications, Inc., Santa Clara, CA (US);
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.