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Intro: roaming

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• Recall: Extended Service Set
  • Extended Service Set:

    A wireless (802.11) network with multiple Access Points:

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• Mobile computing
  • Mobile nodes:

    Wireless nodes is mobile A node can move across different Basic Service Sets (served by different APs)

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• Roaming

  • Roaming:

    Roaming = the ability to switch from one one AP to another AP without losing connectivity

    When mobile host roam (travel), it will cross the coverage area of different APs:

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  • Implementation of Roaming:

    A mobile host must disconnects from its current AP     and      Then connect to another AP