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Doc.: IEEE 802.18-07/0077r0 Submission September 2007 Rich Kennedy, OakTree WirelessSlide 1 5GHz RLANs and the Spectrum Challenges from the Weather Radar.

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Presentation on theme: "Doc.: IEEE 802.18-07/0077r0 Submission September 2007 Rich Kennedy, OakTree WirelessSlide 1 5GHz RLANs and the Spectrum Challenges from the Weather Radar."— Presentation transcript:

1 doc.: IEEE /0077r0 Submission September 2007 Rich Kennedy, OakTree WirelessSlide 1 5GHz RLANs and the Spectrum Challenges from the Weather Radar Industry Notice: This document has been prepared to assist IEEE It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE Working Group. If you have questions, contact the IEEE Patent Committee Administrator at.http:// ieee802.org/guides/bylaws/sb-bylaws.pdf Date: Authors:

2 doc.: IEEE /0077r0 Submission DFS and Weather Radar Radio Regulations for RLANs in 5470 – 5725MHz band require DFS for interference avoidance Weather radar in the 5600 – 5650MHz band has experienced significant interference –Initial blame was placed on non-compliant APs –Analysis showed that even compliant devices could not avoid some radars Staggered PRF Interleaved PRF Narrow pulse (<1uS) –EUMETNET asked TCAM to block the use of this 50MHz of spectrum

3 doc.: IEEE /0077r0 Submission TCAM October 1 st Ad Hoc EUMETNET letter to TCAM –They realize that their radars and not comprehended by EN –They …assume that the RLAN industry would be able to find relevant technical solutions… –They know that the ETSI process takes time ~1 year to approve a new version 18 months before it becomes mandatory WFA letter to TCAM suggesting: –Modify Annex D of EN to include Single pulse based staggered PRF (maximum 3 different PRFs with a minimum number of pulses (depending on PRF) for each PRF) Packet based staggered PRF (maximum 2 different PRFs with a minimum number of pulses (depending on PRF) for each PRF) –Modify annex D so that the min pulse width is reduced from 1 uSec to 0,8 uSec (for both constant PRF and staggered PRF radar signals) –Work with TCAM to see that this is done to everyones satisfaction

4 doc.: IEEE /0077r0 Submission Various Regulatory Domain Actions Canada RS-210 –Block the 5600 – 5650MHz band for the time being –WFA is asking them to consider alternative approach 0.8uS pulse detection 10 min Channel Availability Check –All client devices have to change for spectrum notch –Only AP required to change CAC Japan requiring DFS test changes –0.5uS pulse detection –50% network loading for some tests Others –Korea in the works –Australia asked meteorologists the tell them what they want –Others?

5 doc.: IEEE /0077r0 SubmissionRich Kennedy, OakTree WirelessSlide 5 Questions? What should do?


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