Presentation on theme: "Doc.: IEEE 802.11-10/0527r0 Submission March 2010 Slide 1 A Periodic 5 MHz Measurement Pilot for Channel Scan Date: 2010-05-11 Authors:"— Presentation transcript:
doc.: IEEE 802.11-10/0527r0 Submission March 2010 Slide 1 A Periodic 5 MHz Measurement Pilot for Channel Scan Date: 2010-05-11 Authors:
doc.: IEEE 802.11-10/0527r0 Submission Problem Description Large initial access delay of passive channel scanning is a problem for dot11 devices in TVWS. The problem comes from combinations of many channels (30) and 3 different bandwidth. Scanning time might be around 9,000 ms  relying on beacon frames. 2/8/2014 2
doc.: IEEE 802.11-10/0527r0 Submission Proposed Solution The Measurement Pilot frame defined in dot11k  which contains a subset of the information provided in a Beacon frame is used to assist a STA for scanning. The Measurement Pilot frame has a small interval relative to a Beacon interval which can reduce scanning time. A STA in TVWS still need to try combinations of various bandwidths. We propose to let an AP periodically transmit a 5 MHz Measurement Pilot frame in one of the channels used e.g., the lowest channel, for systems using more than 1 channel. 2/8/2014 3
doc.: IEEE 802.11-10/0527r0 Submission Measurement Pilot Frame Format Action field valueDescription 0-6Reserved 7Measurement Pilot 85 MHz Measurement Pilot 9-255Reserved 2/8/2014 4 Public Action field values Use a different action field value (8), to indicate that it is a 5 MHz Measurement Pilot frame, so that the mismatch of channel bandwidth (10 MHz, 20 MHz) and 5 MHz will not cause a problem.
doc.: IEEE 802.11-10/0527r0 Submission Conclusions An AP transmits 5 MHz Measurement Pilot frames periodically in one of the channels used can greatly reduce the scanning time and complexity of passive scanning process. Based on the received information contained in a 5 MHz Measurement Pilot frame, a STA can tune to the right bandwidth and join the network. 2/8/2014 5
doc.: IEEE 802.11-10/0527r0 Submission References 1.IEEE Standard, "IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 1: Radio Resource Measurement of Wireless LANs," IEEE, New York, NY, June 2008. 2.E. Kim, Y. Seok and S. Park, IEEE document, doc.: IEEE 802.11-10/0263-r1, March 2010. 2/8/2014 6