November 2006 doc IEEE 802 11 061598 r

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 20/40 MHz Channel Selection Date: 2006 -10 -16 Authors: Notice: This document has been prepared to assist IEEE 802. 11. 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 IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s 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 802. 11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http: // ieee 802. org/guides/bylaws/sb-bylaws. pdf>, 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 <stuart. kerry@philips. com> 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 802. 11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee. org>. Submission 1 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 Abstract This presentation gives an overview of proposed changes to Clause 11. 9. 8 (D 1. 04) on channel selection methods for 20/40 MHz operation. Rev. 1 of this presentation has new material starting on slide 11 Submission 2 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 20/40 MHz Channel Selection • Proposed resolution of 24 comments related to Clause 11. 9. 8 Channel Selection Methods for 20/40 MHz Operation • CIDs: – 11. 9. 5 (D 1. 04: 11. 9. 8): 3614 – 11. 9. 5. 1 (D 1. 04: 11. 9. 8. 1): 1061 – 11. 9. 5. 2 (D 1. 04: 11. 9. 8. 2): 12112, 12246, 12113, 12247, 12114, 12248, 1062, 6758, 6879, 7154, 7200 – 11. 9. 5. 3 (D 1. 04: 11. 9. 8. 3): 1065, 2820, 12115, 6880, 12116, 1066, 4533, 6881, 7512 – Miscellaneous: 3102 • Proposed text and editing instructions in doc. 11 -06 -1413 -01 -000 nlb 84 -submission-channel-selection-40. doc Submission 3 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 Overview of Proposed Clause 11. 9. 8 Subclauses: • 11. 9. 8. 1 Introduction • 11. 9. 8. 2 Scanning prior to starting a BSS • 11. 9. 8. 3 Secondary channel activity detection and reporting • 11. 9. 8. 4 Channel management at the AP Content overview: • 11. 9. 8. 1 Introduction • 11. 9. 8. 2 Scanning prior to starting a BSS – Passive/active scan – Overlapping 20/40 MHz BSSs shall use same primary and secondary channels – Same scanning before transitioning from a 20 MHz BSS to a 20/40 MHz BSS Submission 4 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 • doc. : IEEE 802. 11 -06/1598 r 1 11. 9. 8. 3 Secondary channel activity detection and reporting – Performed after a BSS has been started – “Secondary channel activity detection capability” is defined as the ability to record and then report in a Secondary Channel Activity (SCA) Report management action frame, at least one of the following measurements: 1. Detection of reduced SNR on the secondary channel when receiving a 40 MHz PPDU. Detect if the SNR on the secondary channel is more than 3 d. B smaller than the SNR on the primary channel. 2. Detection of interference on the secondary channel when receiving a 20 MHz PPDU on the primary channel. 3. Detection of energy on the secondary channel, where threshold is -60 d. Bm for 2. 4 GHz bands and -60 d. Bm for 5 GHz bands, while idle and performing CCA as defined in 21. 3. 21. 5 – An AP shall be Secondary channel activity detection capable – A non-AP STA may be SCA detection capable Submission 5 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 • STAs may receive Secondary channel activity (SCA) requests from an AP or another STA in the same BSS. • SCA detection capable STAs shall report secondary channel activity to the requesting AP or STA. • The actions of an AP or STA upon detection of activity on the secondary channel, or upon receipt of an SCA report from a STA, are implementation dependent. Submission 6 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 • SCA Request: – Added to the three types of measurement requests already defined for DFS purposes (see REVma D 8. 0 clauses 7. 3. 2. 21. 1 and 7. 3. 2. 22. 1) • SCA Report: – 8 -bit field used to identify the type of SCA detected: • • • Reduced SNR Interference Energy detect Unmeasured 4 reserved bits – Optional for a STA to detect/report SCA, but mandatory to support the required messaging (i. e. , support for. 11 h Measurement requests/reports) Submission 7 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 • 11. 9. 8. 4 Channel management at the AP – Use. 11 h Channel Switch Announcement for relocating BSSs and/or changing the channel width from 20 MHz to 40 MHz and vice versa – APs that perform a channel switch or channel width adjustment shall include in frames containing HT capabilities elements and Channel Switch Announcement elements that announce the change, values for New Channel Number, Supported Channel Width Set and Secondary Channel Offset Submission 8 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 Discussion • The SCA Request/Report is an addition to the. 11 h Spectrum Management Extensions (very likely to be implemented for 5 GHz devices at 5 GHz) • Reuse the Channel Switch Announcement for relocating 20/40 BSSs (part of. 11 h Spectrum Management Extensions) • We propose making Spectrum Management including SCA Request/Report elements mandatory when operating in 40 MHz, for both 2. 4 GHz and 5 GHz • Mandatory for AP to be SCA detection capable • Optional for non-AP to be SCA detection capable • Less desirable alternatives: – Define SCA request/report and alternative Channel Switch Announcement outside of the. 11 h DFS framework (would be redundant) – Introduce Secondary channel activity detection capability bit (doesn’t address channel switching announcement) Submission 9 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 References • 11 -06 -1413 -01 -000 n-lb 84 -submission-channel-selection 40. doc Submission 10 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 New Material Added in Rev. 1 • This presentation gives an overview of proposed changes to Clause 11. 9. 8 (D 1. 05) on channel selection methods for 20/40 MHz operation. Submission 11 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 20/40 MHz Channel Selection • Proposed resolution of 20 comments related to Clause 11. 9. 8 Channel Selection Methods for 20/40 MHz Operation • CIDs: – 11. 9. 5 (D 1. 05: 11. 9. 8): 3614 – 11. 9. 5. 1 (D 1. 05: 11. 9. 8. 1): 1061 – 11. 9. 5. 2 (D 1. 05: 11. 9. 8. 2): 12112, 12246, 12113, 12247, 12114, 12248, 1062, 6758, 6879, 7154, 7200 – 11. 9. 5. 3 (D 1. 05: 11. 9. 8. 3): 1065, 2820, 12115, 6880, 12116, 1066, 4533, 6881, 7512 – Miscellaneous: 3102, 12117 • Proposed text and editing instructions in doc. 11 -06 -1413 -02 -000 nlb 84 -submission-channel-selection-40. doc Submission 12 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 What has changed in 06/1413 r 2 relative to 06/1413 r 1? 1. Deleted Section 11. 9. 8. 3 (Secondary channel activity detection and reporting) as well as the text describing the SCA Request/Report and associated extensions to 7. 3. 2. 21. 4 and 7. 3. 2. 22. 4 (. 11 h Spectrum Management). 2. Added a Secondary Channel Activity field to the Notify Channel Width management action frame to indicate activity on the secondary channel. 3. Added clarifying text to 9. 20. 7 (STA switching from 40 MHz to 20 MHz in 20/40 MHz BSS). 4. Added text on the Extended Channel Switch Announcement (identical to that proposed in TGv/TGy) to enable efficient channel switching in both 2. 4 and 5 GHz without touching 5 GHz specific DFS; modified 11. 9. 8. 4 (Channel management at the AP) accordingly. Submission 13 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 SCA Field SCA Forcing Reduced SNR Interference Energy Detect No SCA Information Reserved • SCA Forcing bit, which shall be set to 1 if secondary channel activity is the reason for requesting that frames sent to the sending STA be of 20 MHz width. Otherwise, the SCA Forcing bit shall be set to 0. • Reduced SNR bit, which may be set to 1 to indicate that the SNR on the secondary channel is more than TBD d. B smaller than the SNR on the primary channel when receiving a 40 MHz PPDU. Otherwise, the Reduced SNR bit is set to 0. • Interference bit, which may be set to 1 when interference is detected on the secondary channel when receiving a 20 MHz PPDU on the primary channel. Otherwise, the Interference bit is set to 0. • Energy Detect bit, which may be set to 1 when energy is detected on the secondary channel, where threshold is TBD d. Bm while idle and performing CCA as defined in 21. 3. 21. 5, Otherwise, the Energy Detect bit is set to 0. • No SCA Information bit, which may be set to 1 when the STA does not have any information to send regarding secondary channel activity. When the No SCA Information bit is set to 1, all of the other bit fields shall be set to 0. Submission 14 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 SCA Field • When the SCA Forcing bit is set to 1, at least one of the Reduced SNR, Interference, and Energy Detect bits shall be set to 1. When the SCA Forcing bit is set to 0, secondary channel activity may still be reported using one or more of the aforementioned three bits. • When the Channel Width field is set to 1 (indicating that any channel width enabled under Supported channel width set may be used), the SCA Forcing bit shall be set to 0. Submission 15 Bjorn A. Bjerke, Qualcomm, Inc.

November 2006 doc. : IEEE 802. 11 -06/1598 r 1 Extended Channel Switch Announcement • Proposed and adopted in TGy Draft 0. 01 and TGv Draft 0. 05. • Copy the TGy (or TGv) editing instructions into the TGn Draft, with minor modifications appropriate for TGn (such as the addition of Secondary Channel Offset element). • Let REVma Editor consolidate three versions in the base standard. E-CSA element: Element ID Length Channel Switch Mode New Regulatory Class New Channel Number Channel Switch Count E-CSA frame format: Category Submission Action Value E-CSA element 16 Secondary Channel Offset element Bjorn A. Bjerke, Qualcomm, Inc.