The initial drafts of the 802.22 standard specify that the network should operate in a point to multipoint basis (PMP). The system will be formed by base stations (BS) supporting multiple subscriber stations called customer-premises equipment (CPE). The CPEs will be attached to a BS via a wireless link. The BSs will control the medium access for all the CPEs attached to it. The BS is responsible for the media access control, managing distributed sensing and deciding what to do next based on the data collected from the CPEs and neighboring BSs.
For the distributed sensing the CPEs help the base station obtain current radio environment information by scanning the spectrum in their vicinity and reporting the results. The BS, with the information gathered, will evaluate whether a change is necessary in the channel used, or on the contrary, if it should stay transmitting and receiving in the same channel.
For the distributed sensing the CPEs help the base station obtain current radio environment information by scanning the spectrum in their vicinity and reporting the results. The BS, with the information gathered, will evaluate whether a change is necessary in the channel used, or on the contrary, if it should stay transmitting and receiving in the same channel.
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