1. RR-TAG Liaison Report July 2009 IEEE 802.18-802.11
Month Year
doc.: IEEE yy/xxxxr0
July 2009
RR-TAG Liaison Report July 2009 IEEE
Date:
Authors:
Rich Kennedy, Research In Motion
John Doe, Some Company

2. IEEE 802.18 Activities Discussed of the EN 300 328 changes
July 2009
IEEE Activities
Discussed of the EN changes
Regulatory Ad Hoc wil work with for input to ERM TG11
Reviewed five documents from 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. July 2009
EN v1.8.1
December 2007 ERM TG11 began a work item to write v1.8.1 of EN
Applications limited to 10mW TX power under EN want to be able to operate at 100mW
Radio control model vendors
Industrial controls manufacturers
g (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. July 2009
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 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
July 2009
Initial Consideration
Bandwidth, Area and Time are primary considerations
Two systems interfere if their Bandwidth overlaps
Bandwidth
Two systems interfere if they transmit at the same Time
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
July 2009
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
July 2009
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:
July 2009
How Does This Affect ?
As an Interference Generator:
Note: Systems compliant with WiFi [sic] specification [x] or with IEEE standard [x] are considered compliant with this requirement. No further assessment or testing for clause 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. July 2009
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. July 2009
Recommendations for
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 should work with to develop an opinion on the formula and test methodology and submit it to ERM TG11#22 in October
IEEE /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
July 2009
Proposal for Teleconference
Coordinate with
Inputs to EN affect both technologies
Must be submitted through
Thursday, August 6th, 2009
Thursday, August 27th, 2009
Rich Kennedy, Research In Motion

12. July 2009
References
ERM_TG11(21)22 - Notes of the 21st meeting of TG11 (ETSI membership required)
Rich Kennedy, Research In Motion