Method and associated apparatus for increment accuracy of geographical foreign agent topology relation in heterogeneous access networks
AssigneeNtt Docomo, Inc.
InventorsFujio Watanabe, Jingjun Cao, Toshio Miki
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Abstract
One aspect of the present invention regards a method of coordinating the handoff of a mobile carrier between a first access network and a second access network, the method including handing off from a first access network that the mobile carrier is currently operating within to a second access network and building a physical access network topology based on the handing off without input from either the first access network or the second access network.
Claims25
A method of determining a geographical relationship between a first access network and a second access network as a mobile device moves between a first access network and a second access network, the method comprising:
- detecting whether or not said first access network has lost connection with said mobile device, and determining a time of said losing connection;
- receiving information regarding said second access network establishing connection with said mobile device, including a time of said establishing connection;
- and
- determining a geographical relationship between said first access network and said second access network based on said time of said losing connection and said time of said establishing connection.
A home agent for a mobile device, comprising:
- an interface coupled to receive messages from a first access network and a second access network;
- a storage unit;
- and
- a central processing unit programmed to perform:
- (a) upon receiving information which indicates a time at which the first access network loses a connection with the mobile device, recording in the storage unit the loss of connection;
- and
- (b) upon receiving information from the second access network which indicates a time at which the second access network establishes a connection with the mobile device, determining a geographical relationship between the first access network and the second access network based on the time of recorded loss of connection in the first access network and the time of establishment of connection in the second access network.
Dependencies are inferred from the claim text.