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IBSS TPC Issues

IBSS TPC Issues. Mike Moreton, Synad Technologies, Ltd. Mike.Moreton@Synad.com. The Problem. One of the “fundamental concepts” of TGh is that the AP provides the client with country information. This is done because we can’t assume that a client is configured correctly.

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IBSS TPC Issues

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  1. IBSS TPC Issues Mike Moreton, Synad Technologies, Ltd. Mike.Moreton@Synad.com Mike Moreton, Synad Technologies Ltd.

  2. The Problem • One of the “fundamental concepts” of TGh is that the AP provides the client with country information. • This is done because we can’t assume that a client is configured correctly. • But an IBSS is started by a client. Is it any more likely to be configured correctly than any other client? Mike Moreton, Synad Technologies Ltd.

  3. AP and “IBSS starter” are different Mike Moreton, Synad Technologies Ltd.

  4. Conclusion • The chance of the country information being correctly configured in an IBSS is almost negligible. Mike Moreton, Synad Technologies Ltd.

  5. An Example • A laptop is used to start an IBSS in a meeting in one country. • The laptop is taken to another country. • It beacons out a Country IE that is still for the first country. • As a result, other stations may start to use channels and power levels that are illegal in the second country. Mike Moreton, Synad Technologies Ltd.

  6. Suggested Changes • IBSS Country and Supported Channels elements should only contain information for the channel on which the IBSS is active. • Stations should in general ignore Country elements and Supported Channels elements received in IBSS beacons and probe responses. • A station joining an IBSS that includes the Country element in the beacon must observe the power limitation indicated for the current channel in that element and in the Supported Channels element (if present). • Stations JOINing an IBSS should generate Country and Supported Channels elements by duplicating them from an existing beacon in the IBSS. They should not send these elements if they are not present in the beacon being copied. Mike Moreton, Synad Technologies Ltd.

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