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HOST MOBILITY SUPPORT. BAOCHUN BAI. Outline. Characteristics of Mobile Network Basic Concepts Host Mobility Support Approaches Hypotheses Simulation Conclusions. Characteristics of Mobile Networks. High bit error rate and low bandwidth.

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Presentation Transcript

Outline
Outline

  • Characteristics of Mobile Network

  • Basic Concepts

  • Host Mobility Support Approaches

  • Hypotheses

  • Simulation

  • Conclusions


Characteristics of mobile networks
Characteristics of Mobile Networks

  • High bit error rate and low bandwidth.

  • Mobile networks are composed of a group of cells .

  • A base station connects a cell with other parts of global network by wired media.

  • Mobile hosts communicate with the base station to exchange information with their correspondent hosts.


Basic concepts
Basic Concepts

  • Home Agent

    • A router on a mobile host's home network.

  • Foreign Agent

    • A router on a mobile host's visited network.

  • Care-of Address

    • The termination point of a tunnel toward a mobile host.


  • Home Address

    • An IP address that is assigned to a mobile host.

  • Home Network

    • A network having a network prefix matching that of a mobile host's home address.

  • Foreign Network

    • Any network other than the mobile host's Home Network.

  • Handoff

    • Mobile hosts migrate from one cell to the other cell while connectivity is still maintained.

    • Soft handoff and hard handoff


Host mobility support methods
Host Mobility Support Methods

  • Two-address methods

    • Mobile IP

  • Hierarchical mobility management approach

    • Cellular IP

  • One-address methods

    • Multicasting-based approach


Hypotheses

Global Internet with Mobile IP

Mobile

IP

redirect

Wireless access network

Local handoff

Cellular

IP

Global mobility

Hypotheses

Mobility Support Architecture


Hypotheses1
Hypotheses

  • Route optimization

    • Using binding update toeliminate triangular route.

  • Retransmission buffer mechanism

    • Adding buffer in base station to decrease the number of lost packets and improve the performance of local handoff


Simulation

NBS

OBS

MH

Simulation

  • Simulation Model and Method

    • Discrete-event simulator

    • Two phases

      • Handoff phase

      • Retransmission phase

    • Events

    • Metrics

      • the lost packet rate

      • the duplicate packet rate


Simulation results analysis
Simulation Results Analysis

the lost packet rate in the case of soft handoff

the lost packet rate in the case of hard handoff


Simulation results analysis1
Simulation Results Analysis

the duplicate packet rate in the case of soft handoff

the duplicate packet rate in the case of hard handoff


Conclusions
Conclusions

  • Retransmission buffer mechanism can effectively to reduce the lost packets during a handoff .

  • In the case of soft handoff, as the number of lost packets decreases, the number of duplicate packet increases.

  • The retransmission buffer size should be no more than the average number of packets sent to the mobile host during a handoff.

  • The decreased number of lost packets is gained at the cost of the increased number of duplicate packets and additional memory consumption for the retransmission buffer in the old base station and the complexity of local handoff protocol.


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