Mobility

Robust Broadcast : Improving the Reliability of Broadcast Transmissions on CSMA/CA

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Executive Summary

Broadcasting has always been a controversial subject in networking. Broadcasting is by essence unreliable and difficult to manage by applications. Some networking technologies such as ATM which don't provide broadcasting have to include complex mechanisms to accommodate standard networking layers which require broadcasting. Common Wireless LANs based on CSMA/CA MAC protocol do include broadcasting, directly translated from their wired counterpart. However transmission by radio is fundamentally different than on a wire and unicast transmission by radio already includes specific mechanisms to adapt to the specific channel conditions, whereas broadcast transmission includes usually none.

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