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4x4 Optimization

4x4 Optimization. Alkesh Patel & Hemant Patel. Background. IP address – identify computer on the network Mobile domain - mobile host IP address is not restricted to region Problem : Identifying computer on mobile domain Solution: Change IP address when the host moves to other subnet

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4x4 Optimization

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  1. 4x4 Optimization Alkesh Patel & Hemant Patel

  2. Background • IP address – identify computer on the network • Mobile domain - mobile host • IP address is not restricted to region • Problem : Identifying computer on mobile domain • Solution: • Change IP address when the host moves to other subnet • Use same IP address and add special routing entries to track the current location of the user – good for small group

  3. Challenge • Following challenges should be solved before considering solution • Compatibility: Should work with current wired internet infrastructure • Scalability: Should be able to support large number of user to meet future demands • Transparency: User should not feel difference between wireless and wired network

  4. Optimization • Optimization scheme should ensure • Guaranteed delivery • Low latency • Low overhead

  5. 4x4 Approach • Four options for packets direction • IN approaches CN to MN • OUT approaches MN to CN • s – outer source in the encapsulated packet • d – outer destination in the encapsulated packet • S – inner source of the packet • D – inner destination of the packet

  6. The IN strategies in 4x4 approach

  7. The OUT strategies in 4x4 approach

  8. Comparison & Evaluation • 16 different strategies for transmission • Four approaches for each of the two directions • Different advantages & disadvantages • Choice based on session basis or packet-to-packet basis

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