Patent ID: 7239618
Filing Date: 2007-07-03
Classification: H04L,H04W

Abstract:
1. A method of establishing a routing path in a distributed packet-based network for packet delivery to a destination node within the same packet-based subnet, said destination node having a destination node address, wherein a first address for delivery of a plurality of packets is assigned to a wireless device in said subnet, said first address utilized when said wireless device is attached to said packet-based network through a base station included within a first domain including a set of identified nodes, and wherein a home agent utilizes a second address for said wireless device when said wireless device is attached to the packet-based network through a base station excluded from said first domain, said method comprising the steps of: launching a path setup message from said destination node; receiving said path setup message over a first interface at a first router; and creating a first routing table entry for a first routing table, said first routing table entry corresponding said destination node address to said first interface, wherein a packet, subsequently received at said first router and having said destination node address as a packet header destination address, is forwarded from said first router over said first interface after said first router associates said destination node address with said first routing table entry, and forwarding a handoff update path setup message, for handoffs processed at a network layer, from a second wireless base station to a first wireless base station if said wireless device is handed off from said first wireless base station to said second wireless base station, said handoff update path setup message used to alter routing table entries for selected routers of said subnet, and wherein said first address for said wireless device continues to be utilized if said second base station is within the same subnet.