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Optimal Solution for Low Latency Scanning in 5 GHz Bands

This paper by Amjad Soomro, Zhun Zhong, and Javier Del Prado from Philips provides detailed information on regulatory requirements for low latency scanning in 5 GHz bands, proposing innovative solutions to reduce passive scanning times and enable active scanning. Key proposals include adding regulatory information to Site Reports and transmitting regulatory information autonomously between beacons. These additions aim to streamline scanning processes without the need for hardware changes.

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Optimal Solution for Low Latency Scanning in 5 GHz Bands

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  1. Regulatory Information for Low Latency Scanning in 5 GHz bands Amjad Soomro, Zhun Zhongand Javier Del Prado Philips Soomro et. al., Philips

  2. European Regulations in 5 GHz Bands • For any STA, before transmitting on a channel • Detect radars • Know maximum transmit power levels • Apply transmit power mitigation, if applicable • However, STAs are allowed to rely on measurements and ‘Mitigation’ requirements announced by AP Soomro et. al., Philips

  3. Situation • STAs are forced to do passive scanning while roaming in 5 GHz bands in European regulatory domains • Similar requirements might become applicable in US in upper 5 GHz bands • Limits on maximum transmit power might be desirable for administrative reasons where regulatory requirements do not exist • Passive scanning may result in wait times of up to one beacon period per scanned channel • 5 GHz bands has at least twelve channels • Many more to be available in future (US) Results in long scan times Soomro et. al., Philips

  4. Proposal 1 • Include regulatory information in Site Report • Enables active scanning • Specifically, include additional four bytes • Maximum Transmit Power Level • Local Power Constraint • Map field (as defined in 802.11h amendment) • Information supplied by neighboring AP’s Soomro et. al., Philips

  5. Proposal 2 • Site Reports may not be always available. • No neighbor information available • APs may choose to not include neighbor information Soomro et. al., Philips

  6. Proposal 2 • Add capability for APs to transmit regulatory information in between beacons • Define new Regulatory Domain Information frame • The frame to be transmitted, autonomously, by an AP in between beacons, zero or more times. Figure 0-6 – Regulatory Domain Information frame body format Figure 1— Regulatory Domain Information Element field format Soomro et. al., Philips

  7. Field Definitions • The definitions for Maximum Transmit Power Level, Local Power Constraint and Map are the same as defined in IEEE 802.11h amendment. Soomro et. al., Philips

  8. Benefits • Beacons have lots of other information • Regulatory Domain Information frame keeps the frame length small • Efficiently announces regulatory domain information, making it easier to transmit it multiple times within a beacon interval • Reduces Passive Scanning Times • By enabling on-demand active scanning • Measurements Results/Information already exists in AP/neighboring APs • No additional measurement burden – just reporting • No hardware changes required Soomro et. al., Philips

  9. Comparison Table for Two Proposals The two proposals are complementary Soomro et. al., Philips

  10. Conclusions • Only passive scanning possible with the current protocol in 5 GHz European bands • The proposal • Enables active scanning • Reduces time spent in passive scanning • Simple additions in the protocol • Without hardware changes Soomro et. al., Philips

  11. Straw Poll 1 Would you support including regulatory information in Site Report to enable active scanning Soomro et. al., Philips

  12. Straw Poll 2 Would you support adding a protocol frame to report regulatory information/measurements Soomro et. al., Philips

  13. Motion 1 • Instruct the editor to incorporate changes submitted in the document 11-04-0753 in the next TGk draft Soomro et. al., Philips

  14. Motion 2 • Instruct the editor to incorporate changes submitted in the document 11-04-0754 in the next TGk draft Soomro et. al., Philips

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