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RR-TAG Liaison Report July 2009 IEEE 802.18-802.11

This report discusses the changes to EN 300.328, the medium utilization formula for non-LBT applications, and the impact on 802.11. Recommendations for future meetings and a proposal for a teleconference are also included.

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RR-TAG Liaison Report July 2009 IEEE 802.18-802.11

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  1. RR-TAG Liaison Report July 2009IEEE 802.18-802.11 Date: 2009-7-15 Authors: Rich Kennedy, Research In Motion

  2. IEEE 802.18 Activities • Discussed of the EN 300 328 changes • 802.11 Regulatory Ad Hoc wil work with 802.15 for input to ERM TG11 • Reviewed five documents from 802.16 for submittal to the ITU-R WP-5D/5A • Ofcom update on the Digital Dividend • Discussion of WG SE21 work item on out of band emissions from weather radars Rich Kennedy, Research In Motion

  3. EN 300 328 v1.8.1 • December 2007 ERM TG11 began a work item to write v1.8.1 of EN 300 328 • Applications limited to 10mW TX power under EN 300 440 want to be able to operate at 100mW • Radio control model vendors • Industrial controls manufacturers • 802.15.4g (Smart Utilities Networks) • Wireless speaker systems • Meetings were dominated by the non-RLAN entities • Application-specific text was being added to the specification • Over time the document was becoming a “telephone book” • Decision was made to develop a “Medium Utilization” (MU) formula that would cover non-LBT applications Rich Kennedy, Research In Motion

  4. The Ground Rules • Prior to the June meeting of TG11, a small group met to decide on an approach that would encompass all applications in one formula • This needs to be a “victim oriented approach” • It must be: • maximally effective • maximally generic • maximally practical • minimally restrictive • “The role of the EN 300-328 can therefore only be to ensure that in case of congestion every compliant device does not take up an unreasonable fraction of the medium, therefore guaranteeing that any system making use of the same medium is not denied a fair fraction of it.” Rich Kennedy, Research In Motion

  5. Initial Consideration Bandwidth, Area and Time are primary considerations Two systems interfere if their Bandwidth overlaps Two systems interfere if they transmit at the same Time Bandwidth Time Two systems can interfere if they are located in the same Area Area Rich Kennedy, Research In Motion

  6. First Attempt at a Formula for MU BW/83.5 MHz is the fraction of the 2.4GHz band utilized Duty Cycle BW / 83.5 MHz Power/100mW represents the fraction of maximum power Power/100mW Duty Cycle represents the time a system is active MU= (BW/83.5MHz) DC  (P/100mW ); MU<[4%] Rich Kennedy, Research In Motion

  7. Adjustments to the Formula • During the June meeting the adjustments to the formula were discussed • Deployment Density should be included in the formula; NO • Industrial and Process Controls with alarms should have priority; NO • Manual blacklisting for frequency hoppers should be allowed; NO • The measure of Power should be TRP instead of EIRP; NO • Higher power for outdoor systems; sector – NO; pencil beam – YES • Bandwidth to be used; 6dBc – NO; 20dBc – YES • PSD is a better measure than Power; YES • Max. TXON time and min. TXOFF time must be considered • Bandwidth is not required; Power Density x Time is the best measure Rich Kennedy, Research In Motion

  8. How Does This Affect 802.11? • As an Interference Generator: • Note: Systems compliant with WiFi [sic] specification [x] or with IEEE standard 802.11 [x] are considered compliant with this requirement. No further assessment or testing for clause 4.3.5 is required • no changes required • As an Interference Victim: • Devices once limited to 10mW in this band will now be allowed to operate at 100mW • Medium Utilization formula is intended to minimize interference Rich Kennedy, Research In Motion

  9. Future TG11 Meetings • It was decided that this work item will not be completed on schedule; chair will request an extension • Next meeting tentatively October 12 – 14, 2009 • After that – December 10 – 11, 2009 (following ETSI BRAN December 7 – 9) • Next meeting will focus on test methodology and coming to a final agreement on the formula and maximum percentage for MU • Plan is to complete the work in March 2010 Rich Kennedy, Research In Motion

  10. Recommendations for 802.18 • An EU regulator has indicated that the current TG11 draft v1.8.1 is flawed; we should help TG11 define this in a technology-neutral way • IEEE 802.11 should work with 802.18 to develop an opinion on the formula and test methodology and submit it to ERM TG11#22 in October • IEEE 802.11/18 members who are also ETSI members should attend the next two meeting to ensure that RLAN interests are properly represented (and voted) • As this will become an ETSI regulation, we need to consider global impact, as many countries follow ETSI Rich Kennedy, Research In Motion

  11. Proposal for Teleconference • Coordinate with 802.15 • Inputs to EN 300 328 affect both technologies • Must be submitted through 802.18 • Thursday, August 6th, 2009 • Thursday, August 27th, 2009 Rich Kennedy, Research In Motion

  12. References • ERM_TG11(21)22 - Notes of the 21st meeting of TG11 (ETSI membership required) Rich Kennedy, Research In Motion

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