Importance

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Abstract

An apparatus, method and system are provided for a hand-off of a communication session in a wireless data network system, in which the communication session has been established previously with a mobile unit through a first base station, a first serving routing node and a gateway routing node utilizing a first addressing context. The preferred method embodiment includes, when a second base station has been selected for hand-off, first establishing a second addressing context, for the mobile unit, between the gateway routing node and a second serving routing node. The gateway routing node then concurrently routes incoming data packets for the mobile unit to the first serving routing node utilizing the first addressing context and to the second serving routing node utilizing the second addressing context. When the mobile unit has retuned to the second base station, the second base station transmits to the mobile unit current voice communication from the incoming data packets with the second addressing context, and receives any outgoing voice communication from the mobile unit. Following such retuning, the gateway routing node may then cease to route incoming data packets for the mobile unit to the first serving routing node utilizing the first addressing context while continuing to route incoming data packets for the mobile unit to the second serving routing node utilizing the second addressing context.

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First Claim