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Steve and Roger, I hope you don't mind my responding to both of you in a single email. Steve, Yes, this letter has to do with radar detection in the 5 GHz band, specifically with European weather radar. WRC-03 made the 5 GHz allocation to RLANs based on work that had been done in ITU-R prior to that WRC. That work included ITU-R developing specific Recommendations regarding the implementation of RLANs, e.g. M.1450 which describes the technologies for use in this band. Indeed Resolution 229 from WRC-03 which implements the allocation is prescriptive and has very specific requirements based both on ITU-R Recommendations and agreements reached at that WRC. Those requirements include power limitations, segmentation of the band between indoor only and outdoor and DFS. National administrations, including the U.S., have implemented RLANs in the 5 GHz band based on Resolution 229. Almost immediately after the WRC some began complaining about interference into weather radars in the 5600 - 5650 MHz band and it seems that an effort is beginning to exclude that band from use by RLANs in Europe. The material presented at 802.18's January interim makes us want to know what it is that SE24 sees as the problem. For reference I have attached Resolution 229. Roger, It may have been better to say that WRC-03, in Resolution 229, implemented/incorporated by reference certain ITU-R Recommendations. Please see the resolves of the Resolution. Those resolves that say "shall" make the use of certain Recommendations mandatory for those national administrations that choose to implement RLANs. In that case the Recommendations are considered part of the Radio Regulations, the international treaty that each WRC establishes. I'm happy to change "approved by WRC-03" to read "implemented by or incorporated by reference at WRC-03". 802.18 is of the view that the interim goal in SE24 is to remove the 5600 - 5650 MHz band from use by RLANs. At this point in time I do not think that any regulator who has implemented 5 GHz RLANs has excluded that portion of the band. Removing that segment would be a regulatory change, a change to the approval to use RLANs in that frequency band. It is also the view of 802.18 that this is a first step in an attempt to remove RLANs from the 5 GHz band in Europe. The latter view is based on knowledge gained by members of 802.18 who participate in other forums. Glad to discuss. Regards, Mike -----Original Message----- From: ***** IEEE 802 Executive Committee List ***** [mailto:STDS-802-SEC@ieee.org] On Behalf Of Shellhammer, Steve Sent: Tuesday, February 24, 2009 18:06 To: STDS-802-SEC@LISTSERV.IEEE.ORG Subject: Re: [802SEC] +++EC 5 Day Review+++Letter to Chair of ECC SE24 Mike, It looks like this is related to radar detection in the 5 GHz band but I have not read the references. My question is that the TAG states "IEEE 802.18 would like to understand any concerns within SE24 related to RLAN operations in the 5 GHz frequency band" I am unclear what the TAG is requesting. The TAG just says it wants to understand their concerns. Would it make more sense to ask a more specific question? Thanks, Steve -----Original Message----- From: ***** IEEE 802 Executive Committee List ***** [mailto:STDS-802-SEC@ieee.org] On Behalf Of Michael Lynch Sent: Tuesday, February 24, 2009 2:57 PM To: STDS-802-SEC@LISTSERV.IEEE.ORG Subject: [802SEC] +++EC 5 Day Review+++Letter to Chair of ECC SE24 Dear EC, During the January wireless interim 802.18 considered work ongoing in SE24 that could have a negative impact on RLANs in the 5 GHz band. There were three related documents presented. They are Docs.18-09-0006, 18-09-0007 and 18-09-0009 and are available on 802.18's Mentor web site. After discussion it was decided to draft a letter on this subject to SE24. The letter is both attached here and available on 802.18's web site as Doc.18-09-0011r1. The draft of the letter was presented to 802.11 and 802.15 during their mid-week plenary and there were no comments or edits. The RR-TAG approved this document by a vote of 8/0/0. This document is being sent to you for the five day review process. I propose that the EC comment period begins now and closes on 1 March. Regards, Mike +1.972.684.7518 Office +1.972.814.4901 Mobile email@example.com <<18-09-0011-r1-0000.doc>> ---------- This email is sent from the 802 Executive Committee email reflector. This list is maintained by Listserv. ---------- This email is sent from the 802 Executive Committee email reflector. This list is maintained by Listserv. ---------- This email is sent from the 802 Executive Committee email reflector. This list is maintained by Listserv.