RR-TAG Liaison Report September 2009 IEEE 802.18-802.11

1. RR-TAG Liaison Report September 2009IEEE 802.18-802.11 Date: 2009-9-23 Authors: Rich Kennedy, Research In Motion

2. IEEE 802.18 Activities • Reviewed input to ERM TG11 for EN 300 328 v1.8.1 • Reviewed and updated ITU-R documents for 11n ratification • M.1450 (no changes required) • M.1801 • Reviewing and finalizing the 802.16 inputs to ITU-R IMT-Advanced Rich Kennedy, Research In Motion

3. Proposal for TG11 • For operation under EN 300 328 rules: • The goal is a technology neutral definition of  an acceptable operational limit. The operational limit should be defined by a maximum amount of energy emitted during a busy second. The setting of operational limits should be premised by agreement not to increase currently established peak transmit power limits. • We realize that a single approach or a single formula may not suffice as a method for determining if a particular device/technology will produce an acceptable level of interference. What follows are two methods, either of which may be used to assess the Medium Utilization. The inability to pass either requires that additional sharing mechanisms must be employed. Rich Kennedy, Research In Motion

4. Proposal Summary September 2009 • Measure the following parameters: • Maximum Tx-On Time: Time transmitter active over any 4ms • Minimum Tx-Off Time: Time transmitter inactive over any 4ms • Duty cycle: Percentage of time Tx on divided by 4ms for any 4ms • MU =Duty Cycle  (P/100mW ) • A system may operate at TX power higher than 10mW only if it satisfies at least one of the following requirements: • Max Tx-On < 0.4ms, Min Tx-Off > 0.1ms, Duty cycle < 10% • Max MU < 4 mJ Slide 4 Rich Kennedy, Research In Motion

5. Method One • TG11 has adopted the Medium Utilisation (MU) approach by which non-adaptive systems should remain below a certain MU limit • MU = PD x BW x DC (Power Density x Bandwidth x Duty Cycle) • But is proposed to replace PD x BW with total P (Power) to result in MU = P x DC • Current limit being considered for non-adaptive systems: MU < [10%] • RLAN manufacturers present during the last TG11 meeting clearly stated that the MU approach only works if duty cycle is further restricted in terms of maximum Tx-on time, minimum Tx-off time, max averaging period, etc… as otherwise a single Duty Cycled system can cause continuous interference into an 802.11 RLAN system. • In order for duty cycled systems to operate at TX power higher than 10mW, the following should be respected: • Max. Tx-on time: 0.4 mSec • Min. Tx-off time: 0.1 mSec • Averaging time: 4.0 mSec • Maximum duty cycle: 10% Rich Kennedy, Research In Motion

6. Shortcomings of Method One • While the proposed elements of duty cycle may facilitate sharing with 802.11 devices, it may still be incompatible with other technologies, especially those with modulations that do not use constant transmit power, e.g., W-CDMA systems. • Current applications in 2.4 GHz use a wide range of different technologies, each having their own needs w.r.t. maximum Tx-on time and minimum Tx-off time making it impossible to agree on a single set of values that could be beneficial for all technologies. Rich Kennedy, Research In Motion

7. Method Two • A variation that we believe will suit not only the short range devices, but also protect devices, like 802.11 devices, that have optimized active sharing mechanism • Medium Utilization = Energy in millijoules measured over 1 second; the limit is • MU < 4 millijoules • Examples • 100 mW for 100 milliseconds (out of 1 second) = 10 millijoules • 10 mW for 1 second (DC – 100%) = 10 millijoules • Compared to the current agreement, the 4 Millijoules represents a lower threshold, but on the other hand, apart from the measuring period of 1 second, no further restrictions are applied on modulation e.g. the Tx-on time and Tx-off time • Joules preferred over ‘Power x Time’ to allow non-constant envelope modulations, or technologies that operate at variable power to benefit from those transmissions where they do not operate at full power. Rich Kennedy, Research In Motion

8. Conclusions • We believe that either of these alternatives will enable the provisions of Paragraph 4.3.5 Spectrum Sharing Mechanisms to allow SRDs to operate at higher power limits than the current limits of EN 300 440 without causing unacceptable interference into Wideband Transmission Systems that have depended on EN 300 328 for market access for many years. Rich Kennedy, Research In Motion

9. ERM TG11 Response Timeline Rich Kennedy, Research In Motion

10. Motion #1 • Move to accept the input to ERM TG11 shown here as the position of the IEEE 802.11 WG, and send to 802.18 for approval and EC review, to submit it to ERM TG11 for their next meeting (October 12 – 14, 2009) • Moved by: Rich Kennedy (Research In Motion) • Seconded by: • Comments? • Vote: • Yes • No • Abstain Rich Kennedy, Research In Motion

11. M.1801 Changes • Changed wording from: • IEEE 802.11-2007 contains four radio units, operating in the 2 400-2 500 MHz band and in the bands comprising 3 650-3 700 MHz, 4.94-4.99 GHz, 5.03-5.091 GHz, 5.15‑5.25 GHz, 5.25-5.35 GHz, 5.47-5.725 GHz and 5.725‑5.850 GHz. One radio unit employs the frequency hopping spread spectrum (FHSS) technique, two employ the direct sequence spread spectrum (DSSS) technique, and the others employ the orthogonal frequency division multiplexing (OFDM) technique. To: • IEEE 802.11 operates in the 2 400-2 500 MHz band and in the bands comprising 3 650-3 700 MHz, 4.94-4.99 GHz, 5.03-5.091 GHz, 5.15‑5.25 GHz, 5.25-5.35 GHz, 5.47-5.725 GHz and 5.725‑5.850 GHz. IEEE 802.11 employs the frequency hopping spread spectrum (FHSS) technique, direct sequence spread spectrum (DSSS) technique, and orthogonal frequency division multiplexing (OFDM) technique. Rich Kennedy, Research In Motion

12. M.1801 Changes [2] • Change wording from: • Approved amendments to the IEEE 802.11-2007 base standard include Radio Resource Measurement of Wireless LANs (IEEE 802.11k), Fast Basic Service Set Transition (IEEE 802.11r) and 3 650-3 700 MHz Operation in the USA (IEEE 802.11y). [Editor's note: this text will be updated when the status of the standard is known. Additional amendment projects are in progress, including the P802.11n project on Enhancements for Higher Throughput (P802.11n) that is working to define a radio unit that operates with nominal RF channel bandwidths of 20- and 40-MHz in the 2 400-2 500 MHz band and the 5 GHz License-Exempt bands.] To: • Approved amendments to the IEEE 802.11-2007 base standard include Radio Resource Measurement of Wireless LANs (IEEE 802.11k), Fast Basic Service Set Transition (IEEE 802.11r), 3 650-3 700 MHz Operation in the USA (IEEE 802.11y) and Enhancements for Higher Throughput (IEEE 802.11n). Rich Kennedy, Research In Motion

13. M.1801 Changes [3] • In Table 6, IEEE 802.11-2007: • Change the wording from: (Presuming amendment per current P802.11n draft) • To: “As amended by IEEE 802.11n” • Remove all of the square brackets (indications that the text is not final) Rich Kennedy, Research In Motion

14. Motion #2 • Move to approve the revised input to ITU-R M.1801 shown here as the position of the IEEE 802.11 WG, and send to 802.18 for approval and EC review, to submit it to the ITU • Moved by: Rich Kennedy • Seconded by: • Comments? • Vote: • Yes • No • Abstain Rich Kennedy, Research In Motion

15. References Rich Kennedy, Research In Motion