METHOD OF PERFORMING AN INTER-TECHNOLOGY HANDOFF IN A LOOSELY COUPLED ARCHITECTURE
The present invention provides embodiments of methods for performing inter-technology handoffs in a loosely coupled network architecture. One embodiment of the method includes configuring a downlink data path from a target access network to a mobile device concurrently with transmitting a data path registration request from the target access network to an anchor point during handoff of the mobile device from a source access network to the target access network.
1 . A method for implementation in a target access network, comprising:
configuring a downlink data path from the target access network to a mobile device concurrently with transmitting a data path registration request from the target access network to an anchor point during handoff of the mobile device from a source access network to the target access network.
2 . The method of claim 1 , wherein configuring the downlink data path comprises configuring the downlink data path using an Internet Protocol (IP) address of the mobile device.
3 . The method of claim 1 , wherein configuring the downlink data path comprises configuring the downlink data path using downlink flow classification information available at the target access network.
4 . The method of claim 1 , comprising starting a timer at the target access network in response to configuring the downlink data path and tearing down the established downlink data path if the timer expires before the anchor point responds to the data path registration request or in response to the data path registration request being rejected.
5 . The method of claim 4 , comprising performing symmetric configuration of the uplink and downlink data paths after the established downlink data path is torn down in response to expiration of the timer expiration, said symmetric configuration being performed in response to receiving a delayed acceptance of the registration request.
6 . The method of claim 1 , comprising forwarding at least one downlink packet to the mobile device prior to or concurrently with receiving a data path registration response from the anchor point indicating that the anchor point has switched a data path binding from the source access network to the target access network.
7 . The method of claim 1 , comprising completing the data path setup by configuring an uplink direction data path from the mobile device via the target access network to the anchor point in response to receiving the data path registration response.
8 . The method of claim 1 , comprising forwarding said at least one downlink packet from the target access network to the mobile device over the downlink data path prior to or concurrently with configuring the uplink data path.
9 . A method for implementation in a mobile device, comprising:
processing at least one downlink data packet received from a target access network before receiving a data path registration response indicating that an anchor point has switched a data path binding from a source access network to the target access network in response to a request to handoff the mobile device from the source access network to the target access network.
10 . The method of claim 9 , wherein processing said at least one downlink packet comprises processing said at least one downlink packet at the mobile device prior to or concurrently with the target access network receiving a data path registration response indicating that the anchor point has switched a data path binding from the source access network to the target access network.
11 . The method of claim 10 , wherein receiving said at least one downlink packet comprises receiving said at least one downlink packet concurrently with the target access network configuring an uplink data path from the mobile device to the target access network in response to receiving the data path registration response.
12 . The method of claim 9 , comprising establishing an uplink data path between the mobile device and the target access network in response to the mobile device receiving the data path registration response indicating that the anchor point has switched the data path binding from the source access network to the target access network.
13 . The method of claim 12 , comprising transmitting at least one uplink packet from the mobile device over the uplink data path between the mobile device and the target access network.