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Tutorial on the P802.22.2 PAR for: “Recommended Practice for the Installation and Deployment of IEEE 802.22 Systems”

Tutorial on the P802.22.2 PAR for: “Recommended Practice for the Installation and Deployment of IEEE 802.22 Systems”. Carl R. Stevenson, WK3C Wireless LLC Gerald Chouinard, Communications Research Centre, Canada Winston Caldwell, FOX Broadcasting. Scope of the PAR.

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Tutorial on the P802.22.2 PAR for: “Recommended Practice for the Installation and Deployment of IEEE 802.22 Systems”

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  1. Tutorial on the P802.22.2 PAR for:“Recommended Practice for the Installation and Deployment of IEEE 802.22 Systems” Carl R. Stevenson,WK3C Wireless LLC Gerald Chouinard,Communications Research Centre, Canada Winston Caldwell, FOX Broadcasting

  2. Scope of the PAR The document recommends best engineering practices for the installation and deployment of IEEE 802.22 systems to help assure that such systems are correctly installed and deployed.

  3. Purpose To provide detailed technical guidance to installers, deployers, and operators of IEEE 802.22 compliant systems to help assure that such systems are correctly installed and deployed.

  4. Need for a Recommended Practice Correct installation and deployment of IEEE 802.22 compliant systems are important to assure that those systems will maximally achieve their design goals in terms of system performance, reliability, and non-interference to incumbent licensed systems with which they will share the TV broadcast bands.

  5. Stakeholders Stakeholders are installers, operators, users, and manufacturers of IEEE 802.22 systems.

  6. How it all started! The FCC released a Notice of Proposed Rulemaking, May 25, 2004, proposing to allow unlicensed radio transmitters to operate in the broadcast television spectrum at locations where that spectrum is not being used.

  7. Fixed/Access • Transmitter power limit: 1 W • Transmitter antenna gain limit: 6 dBi • An incumbent database is required. • Geo-location technique is required using either a GPS or professional installation. • Transmission of a unique identifier is necessary. • Spectrum sensing approach is postulated.

  8. IEEE 802 Standards Process IEEE 802 802.18 Regulatory Matters 802.11 WLAN 802.15 WPAN 802.16 WMAN 802.20 WMANMobile 802.18 SG1 Use of VHF/UHF TV bands by LEequipment 802.11b 11 Mbit/s 802.15.1 Bluetooth 802.16d Fixed 802.11g 54 Mbit/s 802.15.3 High rate 802.16e Mobile 802.11n 100 Mbit/s 802.15.4 Zigbee 802.11j Relay … … … Wi-Fi Wi-MAX

  9. IEEE 802 Standards Process IEEE 802 802.18 Regulatory Matters 802.11 WLAN 802.15 WPAN 802.16 WMAN 802.20 WMANMobile 802.22 WRAN … 802.22.1 EnhancedPart 74protection 802.11b 11 Mbit/s 802.15.1 Bluetooth 802.16d Fixed 802.11g 54 Mbit/s 802.15.3 High rate 802.16e Mobile 802.22.2 RecommendedPractice 802.11n 100 Mbit/s 802.15.4 Zigbee 802.11j Relay … … … Wi-Fi Wi-MAX

  10. IEEE 802.22 Functional Requirements(primarily related to incumbent protection) • 1 W transmitter power with a maximum of 4 W EIRP. • Fixed point-to-multi-point access only. • Base station controls all transmit parameters and characteristics in the network. • Base station is professionally installed and maintained. • Location awareness for all devices in the network • Customer Premise Equipment (CPE) antenna is to be installed outdoors at least 10 m above ground. • CPE cannot transmit unless it has successfully associated with a base station. • Base station uses an up-to-date database augmented by distributed sensing to determine channel availability.

  11. “Regional Area Network” RAN IEEE 802.22 30-100 km 33 μsec 2.2 μsec Multipath absorption Window(Cyclic prefix ) 0.25 0.8 18 Mbps BW= 6,7,8 MHz 54 - 862 MHz IEEE Standards

  12. Optimum frequency rangefor large area Non-Line-of-sight Broadband Access Antenna aperture Phase noise Filter selectivity Noise Figure

  13. License-exempt bands Optimum frequency rangefor large area Non-Line-of-sight Broadband Access

  14. Existing RF spectrum usageMain markets

  15. Broadband IP-based communications below1 GHz Spectrum Occupancy (Test conducted with antenna at a height of 22.1 metres above the ground in the rural sector west of Ottawa, Canada) Low UHF

  16. - WiFi hot-spots in ISM bands - Higher power, lower frequency broadband access system 20 km 23 km 30 km 64-QAM 16-QAM QPSK PHY Adaptive modulation Rural Broadband: - Cable-modem / ADSL MAC Long round-trip delays

  17. RF Input Ethernet to computer Power Supply RF Output CPE Mock-up(RF based on low-cost UHF-TV tuners)

  18. WRAN System Capacity and Coverage

  19. www.crc.ca 2.0 M 802.22 WRAN 1.6 M USA (scaled) 1.2 M Canada Population per density bin (Million) 0.8 M 0.4 M 0.0 M 4 W Base Station Household reach by technologies(“last mile”) WRAN100 W Base Station4 W User terminal Satellite ADSL, Cable, ISM and UNII Wireless and Optical Fiber FCC Definition of ‘Rural’

  20. Alternate channels interference case <= DTV <= WRAN Saturation of DTV receiver from WRAN transmission => control of transmit power (Co-channel and1st adj. channel=> keep-out distances) Noise limited contour 41 dB(uV/m)

  21. DTV station BS keep-out distance: Co-channel: 31 kmAdjacent channel: 1 km 135 km DTV noise-limited contour Base station power: 4 W (USA)Antenna height: 75 m CPE keep-out distance: Co-channel: 3 kmAdjacent channel: 70 m 15 km 23 km 30 km Max throughput per 6 MHz:23 Mbit/s User terminal (CPE) power: 4 Wantenna height: 10 m Max throughput per 6 MHz:4.2 Mbit/s downstream384 kbit/s upstream Characteristics of 802.22 WRAN: 64-QAM 16-QAM QPSK Minimum service availability:location= 50%time= 99.9%

  22. Cognitive Radio • Allows spectrum sharing on a negotiated or opportunistic basis. • Adapts a radio’s use of spectrum to the real-time conditions of its operating environment. • Offers the potential for more flexible, efficient, and comprehensive use of available spectrum. • Reduces the risk of harmful interference.

  23. Cognitive Radio Techniques(as per the NPRM) • Database/Geo-Location: Determine whether the unlicensed device is outside the protected contour of a licensed station using a database with a geo-location device. • Control Signal: Receive a control signal from an established incumbent service indicating which channels are available or are occupied in the area. • Sensing: Sense the RF environment to a certain threshold to detect whether a TV channel is in use.

  24. 1- Problems with the Proposed Database/Geo-Location Technique(as per the NPRM) • Databases can have mistakes and can be inaccurate. • Databases are not updated instantaneously with real-time changes in the RF environment. • GPS does not operate well indoors (CPE antenna has to be outdoors anyway). • Solution: Databases/geolocation techniques could be used for first assessment of channel availability but need to be supplemented by sensing.

  25. 2- Problems with the Proposed Control Signal Technique(as per the NPRM) • Control signals indicating available channels from different sources may overlap and cause confusion. • Control signals indicating occupied channels from different sources may overlap and cause confusion. • No incentives for incumbent services to provide control signals for unlicensed operation. • Solution: control signal provided by the base station

  26. 3- Problems with Sensing(as per the NPRM) • The detectable RF environment changes dramatically with minor changes in location of the sensing device due to multi-path, fading, or shadowing. • The “hidden node” problem occurs when a sensing device is being shadowed by either a man-made structure or terrain and cannot accurately detect what TV channels are occupied. • Solution: collaborative sensing from a number of CPEs and data fusion/centralized control at the base station, augmented by geolocation/database.

  27. IEEE 802.22 Work Plan

  28. Need for Recommended Practice • Recommended Practice is needed to help operators make best use of the spectrum while protecting incumbents • Installation and deployment requirements to protect incumbents need to be well understood • Typical WRAN deployment and installation need to be explained to new potential operators • Capabilities and limitations of the 802.22 standard need to be known • Impact of departure from typical operation needs to be understood

  29. What theRecommended Practicemay cover:

  30. Best practices for base station siting and installation: • Site selection and frequency selection based on local TV channel usage • Use of computer based coverage prediction tools and databases to identify potential coverage area and potentially affected incumbents • Transmit antenna and power constraints for given location • Co-existence with neighbour WRAN operators

  31. Best practices for Base Station operation and performance verification: • Continuous monitoring of the interference environment • Normal sensing reporting • Special sensing request to CPEs and reporting • Data fusion and automatic and/or manual frequency channel control • Interface with the incumbents for interference resolution • Smooth increase of service provision by using multiple channels • Load balancing • Fall-back scheme in case of interference and insufficient channels • Monitoring of key operational and performance parameters

  32. Best practices for CPE installation and control: • Verification of physical location (at registration, GPS, relative position among CPEs) • Verification of the installation (10 m high antenna, right azimuth, fixed installation: remote, visual) • Instruction to new subscribers (installation and antenna alignment, problem identification, network access) • Guidance on serving subscribers near the edge of the coverage versus system loading and interference potential

  33. Best practices for interference avoidance: • Optimizing collaborative sensing based on a number of well positioned CPEs relative to an incumbent operation • Techniques for improved coexistence among WRAN operators in the same area

  34. Best practices for Part 74 device protection • How to maximize the sensing capability of BS and CPEs for wireless microphones and the limitations • Use of enhanced detection schemes (TG1) • Means for the operator to avoid interference • Channel switch in the local vicinity based on location information

  35. Conclusions • 802.22 sees a compelling need to develop such a Recommended Practice • The PAR was everwhelmingly approved by the 802.22 WG members • Licensed incumbents wholeheartedly support the development of this Recommended Practice • 802.22 wants to proceed and will be seeking EC approval to submit the PAR to NesCom

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