1. doc.: IEEE 802.11-10/1457r0 Submission December 2010 David Halasz, OakTree WirelessSlide 1 Frequency Hopping Review and IEEE 802.11ah Date: 2010-12-15 Authors:

2. doc.: IEEE 802.11-10/1457r0 Submission Abstract This submission is a general review of IEEE 802.11ah and Frequency Hopping. December 2010 David Halasz, OakTree WirelessSlide 2

3. doc.: IEEE 802.11-10/1457r0 Submission Excerpts from PAR This amendment also adds support for: -transmission range up to 1 km -data rates > 100 kbit/s while maintaining the 802.11 WLAN user experience for fixed, outdoor, point to multi point applications. 11-10-0001-13 PAR and 5C December 2010 David Halasz, OakTree WirelessSlide 3

4. doc.: IEEE 802.11-10/1457r0 Submission 802.11 WLAN user experience The IEEE 802.11 MAC is largely common amongst the IEEE 802.11 PHYs. –IEEE 802.11d : Operation in additional regulatory domains –IEEE 802.11e : QoS enhancements –IEEE 802.11h : Spectrum and Tx Power Management extensions –IEEE 802.11i : Security Enhancements –IEEE 802.11k : Radio Resource Measurements –IEEE 802.11p : Vehicular Environments –IEEE 802.11r : Fast BSS Transition –IEEE 802.11w : Protected Management Frames –IEEE 802.11z : Direct-Link Setup December 2010 David Halasz, OakTree WirelessSlide 4

5. doc.: IEEE 802.11-10/1457r0 Submission 802.11 WLAN user experience Upcoming MAC enhancements –IEEE 802.11s : Mesh –IEEE 802.11u : Interworking with External Networks –IEEE 802.11v : Wireless Network Management –IEEE 802.11aa : Enhancements for Robust Video Streaming December 2010 David Halasz, OakTree WirelessSlide 5

6. doc.: IEEE 802.11-10/1457r0 Submission IEEE Draft P802.11 REVmb D6.02 FH being obsoleted 802.11 REVmb TG agreed to mark clauses and features as obsolete and subject to removal during the next maintenance PAR cycle SB Comment resolution spreadsheet has multiple entries to remove obsolete text. –11-10-1284-01-000m-revmb-sponsor-ballot-comments.xls11-10-1284-01-000m-revmb-sponsor-ballot-comments.xls –CID’s 1051, 1168, 1264, 1567, 2028 & 3140 All FH PHY text is marked as obsolete and subject to removal –Search the REVmb draft for “obsolete” December 2010 David Halasz, OakTree WirelessSlide 6

7. doc.: IEEE 802.11-10/1457r0 Submission FH Issues FH being obsoleted, and has not been maintained since ~2003 IEEE 802.11k provides mechanisms to make measurements on current channel, and does not work on the FH PHY –What if change channels? FH PHY is for the 2.4 GHz band –New tables would need to be configured IEEE 802.11 FH dependent on Beacon and Probe Response. As data rate lowers, this mechanism consumes more of the available bandwidth. December 2010 David Halasz, OakTree WirelessSlide 7

8. doc.: IEEE 802.11-10/1457r0 Submission References 1) 802.11 REVmb D6.02 (use 802 WG membership login and password to download) http://www.ieee802.org/11/private/Draft_Standards/11mb /Draft%20P802.11REVmb_D6.02.pdf December 2010 David Halasz, OakTree WirelessSlide 8

9. doc.: IEEE 802.11-10/1457r0 Submission December 2010 David Halasz, OakTree WirelessSlide 9 Backup slides

10. doc.: IEEE 802.11-10/1457r0 Submission Obsolete FH text Beacons and Probe Responses contain information for FH devices to be synchronized. An FH STA receiving a Beacon or Probe Response will be able to calculate when the frequency change will occur and the next channel frequency. December 2010 David Halasz, OakTree WirelessSlide 10

11. doc.: IEEE 802.11-10/1457r0 Submission Obsolete FH text Interesting fields in the Beacon and Probe Response, –Timestamp : 8 octets, a time value –Beacon interval : 2 octets, time between Beacons –FH Parameter Set Dwell Time : 2 octets, Length of time on a frequency Hop Set : 1 octet, Set and pattern give sequence Hop Pattern : 1 octet, Set and pattern give sequence Hop Index : 1 octet, Current index. December 2010 David Halasz, OakTree WirelessSlide 11

12. doc.: IEEE 802.11-10/1457r0 Submission Obsolete FH text Change frequency when Timestamp MOD Dwell time is zero Increment Hop Index and use Hop Set and Hop Pattern to determine next channel frequency –Annex G provides the Hop sequences. –Information in clause 13.7.8 “Hop sequences” also provides information on how to calculate the Hop sequences. December 2010 David Halasz, OakTree WirelessSlide 12