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DATA CONNECTION RE-ESTABLISHMENT USING CIRCUIT-SWITCHED CHANNEL

IP.com Disclosure Number: IPCOM000126817D
Publication Date: 2005-Aug-10
Document File: 1 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database

Abstract

As a result of unsynchronized protocol state machines for data connections in the mobile and the network infrastructure, the network may view the mobile as unreachable and close the data connection. Also, the mobile using the data path to the network may miss a response to a question from the network, leading it to believe that it is no longer in radio contact with the network. These scenarios may occur as a consequence of the mobile temporarily moving outside of radio coverage. With unsynchronized protocol state machines, the result can be that both the network and the mobile believe that the other is unreachable and will not attempt to restart communications.

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DATA CONNECTION RE-ESTABLISHMENT USING CIRCUIT-SWITCHED CHANNEL

Disclosed Anonymously

As a result of unsynchronized protocol state machines for data connections in the mobile and the network infrastructure, the network may view the mobile as unreachable and close the data connection.  Also, the mobile using the data path to the network may miss a response to a question from the network, leading it to believe that it is no longer in radio contact with the network.  These scenarios may occur as a consequence of the mobile temporarily moving outside of radio coverage.  With unsynchronized protocol state machines, the result can be that both the network and the mobile believe that the other is unreachable and will not attempt to restart communications.

This invention suggests utilizing an alternate path to reach the endpoints of the connection and to try and restart communications.  In doing so, one can resynchronize the state machines for the data service connection.  The other path is the circuit-switched (CS) path normally used for voice.

Using the CS path to establish or re-establish communications in the direction of network to mobile is a well understood mechanism.  But in the direction of mobile to network, this method is novel.  This is because mobiles support data and voice applications and thus support packet data and CS paths with their associated addressing mechanisms.  Application servers that are used for data traffic normally support only a data path and n...