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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) / 22K

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. 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 not a CS path. Thus, a mobile typically has just one method of connecting to an application server, via a data connection. In most cases, it is impossible for a CS call to be made to an application server. This idea suggests that certain applications servers or components of infrastructure be made to support CS connections. This can be done by assigning a modem to the server with an associated address (phone number). Then, when a data path/connection is thought to be unreachable via the mobile, the mobile can then “call” the application server using the server’s PSTN/ISDN phone number and tell the application to resynchronize its state machine to the mobile’s and re-start the wireless data oath connection. This CS call could be a short call setup message with a minimal amount of data indicating the identity of the mobile and some information to trigger the application server to connect the mobile. An alternative to the above is to make the landline CS connection to the application server appear as if it is a wireless device using wireless CS features. This may then allow the mobile to send an SMS message to the application server to trigger it to resynchronize its state machine.

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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...