Method for rerouting and route optimization for handoff management in a communications network
US6654361B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1998 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Sep 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W40/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A handoff scheme for a communications network is disclosed. In a first embodiment a procedure for finding an optimal path between an originating network node and a destination network node is integrated in the handoff procedure. An optimally routed connection is obtained by first determining an optimal “crossover node” along the existing path and then the handoff is effected by altering the existing connection route so that it travels along the existing path until it reaches the crossover node, where the path then varies from the original route, and a new segment between the crossover node and the new location is established. Then the call is switched to the new segment and the corresponding old segment on the old connection is released. In an alternative embodiment, the handoff procedure is performed first by completing a fast reroute connection using a prior art path extension method. This results in a quick, but sub-optimal handoff connection. Once the handoff is completed, the route is optimized by selecting a segment on the sub-optimal connection for rerouting and then utilizing the method of the first embodiment to establish an optimally routed connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.