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NETWORK INDICATION OF REAL TIME AVAILABILITY OF AERONAUTICAL COMMUNICATIONS CHANNEL

IP.com Disclosure Number: IPCOM000008283D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-Jun-03
Document File: 2 page(s) / 111K

Publishing Venue

Motorola

Related People

Daniel Richard Tayloe: AUTHOR [+4]

Abstract

The current generation digital network that is being used to transport packet data between the cockpit of a commercial aircraft and other entities such as the ATC (air traffic controllers) and the AOCs (airline operation center such as United, or America West, etc.) is rapidly evolving. The present character-based protocol is quickly becoming obso- lete by the introduction of ATM into the network.

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@ M-LA

Technical Developments

NETWORK INDICATION OF REAL TIME AVAILABILITY OF AERONAUTICAL COMMUNICATIONS CHANNEL

by Daniel Richard Tayloe, Nathan West Miller, Bob Frederick and Baldev Sangha

PROBLEM DESCRIPTION

  The current generation digital network that is being used to transport packet data between the cockpit of a commercial aircraft and other entities such as the ATC (air traffic controllers) and the AOCs (airline operation center such as United, or America West, etc.) is rapidly evolving. The present character-based protocol is quickly becoming obso- lete by the introduction of ATM into the network.

  One of the apparent requirements of ATM is the ability of the message source to determine if the destination address of the packet is currently avail- able. From the cockpit point of view, looking into the IRIDIUM" satellite constellation, this is easy to do. The satellite constellation provides an indication of an overload condition in the local beam. An over- load condition results in that beam rejecting any new calls. This indication is carried by the Broadcast Channel which contains a "blocking bit" that is set only if the local beam has run out of channels for new calls.

  The main problem of determining availability of the far end of the connection is not at the radio end (the airline cockpit) looking out to the PSTN (Public Switched Telephone Network), but rather at the PSTN trying to determine if the cockpit radio end currently has both coverage and channel availability

PROPOSED SOLUTION

  As mentioned above, the IRIDIUM satellite provides an indication to the local beam when there are no more channels available for origination or terminations into the network. The satellite could also pass indications of these blocking/no-blocking transitions to the ground where they could be distributed to the GWs (Gateway).

  The normal condition for the large majority of beams will be that channels are available. This will be especially true over the oceans where it is desired that ATM type safety services are to be used. Therefore, if the network needs to send a packet or series of packets to a particular airliner, the GW could start normal ring alert processing and calculate which beams would need to be rung for the area the airliner was last registered in.

  At this point, the "b...