Multi-access CS-P/CD-E system and protocols on satellite channels applicable to a group of mobile users in close proximity
First Claim
1. In a multiple access RF communication system in which a plurality of mobile user transceivers communicate with a central hub transceiver over long delay channels, and wherein groups of mobile user transceivers in close proximity with each other share a common multi-access inbound channel frequency F1 and a common outbound channel, frequency Fo, the improvement comprising:
- each said mobile user transceiver including a continuously listening proximity receiver for the inbound channel and a half-duplex transceiver on the inbound channel means for determining the busy or idle status of said common inbound frequency Fl, and means to indicate the status of said carrier outbound channel and control the ability to transmit on the inbound channel.
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Accused Products
Abstract
A multiple access RF communication system in which a plurality of mobile user transceivers communicate with a central hub transceiver through an earth orbiting satellite, and wherein groups of mobile user transceivers in close proximity with each other share a common multi-access inbound (to hub) frequency Fl and a common outbound channel (from hub) frequency Fo. Each said mobile user transceiver includes a continuously listening receiver for the outbound channel and a half-duplex transceiver on the inbound channel, determining the busy or idle status of the common inbound frequency F1, and a device to indicate the status of the carrier outbound channel, which controls the ability to transmit on the inbound channel.
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Citations
9 Claims
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1. In a multiple access RF communication system in which a plurality of mobile user transceivers communicate with a central hub transceiver over long delay channels, and wherein groups of mobile user transceivers in close proximity with each other share a common multi-access inbound channel frequency F1 and a common outbound channel, frequency Fo, the improvement comprising:
each said mobile user transceiver including a continuously listening proximity receiver for the inbound channel and a half-duplex transceiver on the inbound channel means for determining the busy or idle status of said common inbound frequency Fl, and means to indicate the status of said carrier outbound channel and control the ability to transmit on the inbound channel. - View Dependent Claims (2, 3, 4, 5)
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6. In a multiple access RF communication system in which a plurality of mobile user transceivers communicate with a central hub transceiver through an earth orbiting satellite, and wherein groups of mobile user transceivers in close proximity with each other share a common multi-access inbound frequency F1 and a common outbound channel frequency Fo, the improvement comprising a simplex receiver at the outbound channel for receiving messages from a central controller and a half-duplex transceiver at the inbound multi-access channel for transmission of messages to the hub, listening to the channel to ensure that the channel is not busy before transmitting, and listening to the channel to extract data from proximity mobiles that may be transmitting a message to the central controller.
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7. In a multiple access RF communication system in which a plurality of mobile aircraft user transceivers communicate with a central hub transceiver through an earth orbiting satellite, and wherein groups of mobile aircraft user transceivers in close proximity with each other share a common multi-access inbound frequency F1 and a common outbound channel frequency Fo, the improvement comprising means forming voice and data communication channels, said data channels used for dependent surveillance for aircraft, whereby a mobile aircraft user transceiver announces its presence to an air traffic controller when it enters a proximity region and then is regularly polled by the traffic controller, and sends its position, speed, heading and other data in response to the poll by the traffic controller.
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8. In a multiple access RF communication system in which a plurality of mobile aircraft user transceivers communicate with a central hub transceiver through an earth orbiting satellite, and wherein groups of mobile aircraft user transceivers in close proximity with each other share a common multi-access (MA) inbound frequency F1 and a common outbound channel frequency Fo, the improvement comprising a method of aircraft collision avoidance wherein use by the mobile aircraft user transceiver of said inbound data channel for air-to-air collision avoidance wherein a mobile aircraft user transceiver detects the presence of another aircraft user transceiver in the proximity region by listening in on the MA inbound channel, learning the position and vector of that proximity aircraft by demodulating and interpreting the navigation data that is sent by that mobile aircraft user transceiver, and finally by taking measures to avoid that aircraft if they are on a collision course.
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9. A system for avoiding aircraft collisions in which each aircraft has an RF transceiver;
- a multi-beam RF communication system comprising an orbiting satellite relay which transmits to earth on one or more satellite beams, each satellite beam transmits voice, data, surveillance report back requirements and the retransmission of inbound surveillance reports from aircraft transceivers in the beam and aircraft transceivers near the beam'"'"'s boundary so that each aircraft transceiver can demodulate and interpret the positional data transmitted via the satellite relay and determine if any aircraft is a collision threat and if so take measures to avoid the aircraft presenting a collision threat.
Specification