Importance

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Abstract

An efficient method and architecture for transferring packetized digital data over a circuit switched data network. On packet data calls, the receiving entity initially identifies the packetized data call as being of the circuit switched variety, thereby permitting further processing of the call using circuit switched infrastructure. Based on identification information embedded in the received data packets, the receiving entity subsequently identifies the call as being a packet data format, and routes the payload packet data to the upper layers of the protocol stack of the receiving entity. The network layer then routes the packet data directly to the connected data network (such as the internet), bypassing normal circuit switched call processing. Accordingly, infrastructure not equipped to handle packet data can be made to do so in an efficient and reliable manner, using only existing cellular service options and a unified interworking function (IWF) module. Mobile unit dormancy is supported on mobile-terminated packet data calls through the use of a second existing cellular service option for paging and call identification.

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First Claim