What DFS measurement reporting mechanisms should be included? November 2001 doc.: IEEE 802.11-01/622r0 What DFS measurement reporting mechanisms should be included? Andrew Myles (Cisco Systems) 7 November 2001 Andrew Myles, Cisco Systems Andrew Myles, Cisco Systems

There is a spectrum of possible approaches for DFS measurement reporting DFS measurement and reporting philosophy Undertake measurement internally Another STA undertakes measurement Nothing reported externally Report raw measurements Report filtered measurements Report the “answer” Report using “blob” Raw RSSI measurements D1.0 solution BSS, …, Foreign PLCP, & periodicity bits Total RSSI histo CCA busy fraction, duration & interval Unknown RSSI histo BSS sets Is the channel clear? Is there a licensed user operating in the channel? Is there an unlicensed user operating in the channel? Provide basic request and reporting infrastructure Define contents orf requests and reports as required Andrew Myles, Cisco Systems

DFS should provide facilities for reporting the “answer” and reporting flexible “blobs” Approach Advantages Disadvantages Conclusion Report raw measurements Centralised processing of data Can easily change algorithms as regulations change Requires very large measurement reports Flexible, but too much data Report filtered measurements (D1.0 solution) Some centralised processing of data Can easily change algorithms as regulations change, within the constraints imposed by the content of the filtered reports Limits the size of measurement reports May provide insufficient information to detect licensed and unlicensed users May provide the wrong information as regulations change Requires STAs to process some measurements Poor compromise – worst of all worlds Report the “answer” Minimises the size of measurement reports Focuses reports on whether licensed and unlicensed users are operating in a channel Requires STAs to maintain up to date algorithms as regulations change (required anyway for IBSS) Requires STAs to process all measurements (required anyway for IBSS) Solution focused on detecting licensed users Report using “blob” Allows new measurements and reports to be defined as the regulations change or are refined ? Flexible and extensible Andrew Myles, Cisco Systems