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

2. 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

3. 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