July 2005

Douglas Prendergast, CRC

Slide 1

doc.: IEEE 802.22-05/0063r0

Submission

[DRAFT] FCC ex parte presentation on WRANIEEE P802.22 Wireless RANs Date: 2005-07-16

Name Company Address Phone email Douglas Prendergast Communications

Research Centre Broadcast Technology

Research

3701 Carling Avenue, Ottawa, Ontario, Canada, K2H 8S2

+1 613-998-2384 douglas.prendergast@crc.ca

Authors:

Notice: This document has been prepared to assist IEEE 802.22. 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 802.22.

Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.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 Carl R. Stevenson 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 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@ieee.org.

July 2005

Douglas Prendergast, CRC

Slide 2

doc.: IEEE 802.22-05/0063r0

Submission

On the Implementation of an ATSC forward Channel and a Terrestrial Return Channel

incorporating Cognitive Radio (Unlicensed Devices)

Prepared by Douglas Prendergast

Broadcast Technology Research - CRC

Presented by Gerald Chouinard

Project Manager RRBA - CRC

July 2005

Douglas Prendergast, CRC

Slide 3

doc.: IEEE 802.22-05/0063r0

Submission

Objective

To promote to Working Group 802.22 the use of ATSC-DTV as the Downlink channel in the

implementation of

WRAN using Cognitive Radio

Unlicensed Devices

July 2005

Douglas Prendergast, CRC

Slide 4

doc.: IEEE 802.22-05/0063r0

Submission

Philosophy

• Full power broadcast facility available from participating broadcaster - Wide coverage area.

• WRAN will operate without broadcasters participation using a low power ATSC BS - Technology available today.

• Interference issues simplified with Watermark information

• Suitable Return channel needs to be supplied and integrated along with ATSC modification

July 2005

Douglas Prendergast, CRC

Slide 5

doc.: IEEE 802.22-05/0063r0

Submission

Outline

• Introduction

• Background

• System Description - CRC WRAN Concept

• Overview Advanced Television Systems Committee (ATSC-DTV) features.

• Conclusions

July 2005

Douglas Prendergast, CRC

Slide 6

doc.: IEEE 802.22-05/0063r0

Submission

Introduction

• Customers will purchase Unlicensed Devices (UD) faster if Value Added Services (VAS) are provided.

• ATSC DTV system could provide VAS services such as Interactive Television (ITV) and Internet Multimedia Services (IMS) for WRAN - ITV is a bonus for WRAN with ATSC-DTV downlink.

• Wireless digital high speed return channel needed tailored to the ATSC forward channel for a complete WRAN.

• Rural and remote areas primary beneficiary.

July 2005

Douglas Prendergast, CRC

Slide 7

doc.: IEEE 802.22-05/0063r0

Submission

Background

• FCC - Issue NPRM for the use of UD in TV band.• Affected: NTSC, ATSC-DTV, Part 94 Wireless

Microphone.• Incumbent concerned with interference issues

associated with UD’s in TV band• ATSC- DTV Downlink with a suitable Terrestrial

Return Channel will help to allay incumbent concerns.

July 2005

Douglas Prendergast, CRC

Slide 8

doc.: IEEE 802.22-05/0063r0

Submission

Background ContinuedWRAN operational Requirements: CRC Perspective:

– Required User Base ~ 2000– Range up to ~ 40 km– Population density is sparse– User most likely distributed around BS (DTV)

transmission tower(s)– Spectrum available in Rural and Remote areas– Non-Line of Sight operation– Cost effectiveness

Public Broadcast Television is available everywhere in North America (PBS - US, CBC - Canada) for Forward channel use.

July 2005

Douglas Prendergast, CRC

Slide 9

doc.: IEEE 802.22-05/0063r0

Submission

System OverviewCRC WRAN Conceptusing ATSC/RCT

July 2005

Douglas Prendergast, CRC

Slide 10

doc.: IEEE 802.22-05/0063r0

Submission

WRAN Base Station

July 2005

Douglas Prendergast, CRC

Slide 11

doc.: IEEE 802.22-05/0063r0

Submission

WRAN Customer Premise Equipment (UD)

July 2005

Douglas Prendergast, CRC

Slide 12

doc.: IEEE 802.22-05/0063r0

Submission

ATSC/RCT concept for WRAN

• Up-link: Suitable Terrestrial Return Channel (RCT)

• Downlink: ATSC-DTV

July 2005

Douglas Prendergast, CRC

Slide 13

doc.: IEEE 802.22-05/0063r0

Submission

ATSC Forward Channel Features.

• Large Data capacity: up to 20 Mbps in one 6 MHz channel

• Flexible coverage: Typically 85 km for a DTV station

• Developed for VHF-UHF operation: Frequency Agile

• Non-LOS, Provides good Multipath and to Interference performance

• Provides for Flexible trade-off between data capacity and robustness

• Low Cost: DTV Consumers Products

• UHF channels are available (Particularly in Remote areas)

• Sustain long delay spread required by SFN operation

• Excellent doppler and multipath performance for mobility

July 2005

Douglas Prendergast, CRC

Slide 14

doc.: IEEE 802.22-05/0063r0

Submission

ATSC Forward Channel Features Continued.

• Allows for less complex UD hardware development– Hardware readily available

– Some modification may be necessary.

• TxID watermark information in ATSC- DTV may be implemented in UD’s– Should reduce interference mitigation issues.

• TPC and DFS algorithms possible in support of UD’s

July 2005

Douglas Prendergast, CRC

Slide 15

doc.: IEEE 802.22-05/0063r0

Submission

Return Channel OverviewSome Desired Features

• Protocol Stack compatible with a modified ATSC-DTV stack.

• Spectrum efficient - User defined bandwidth

• Adaptive modulation.

• Segmentation over 6-7-8 MHz channel

• Power control (to a Maximum of 4 watt EIRP)

• Flexible network implementation: various cell size and degree of robustness

• MAC Security functions needed

July 2005

Douglas Prendergast, CRC

Slide 16

doc.: IEEE 802.22-05/0063r0

Submission

Conclusions

• Using ATSC-DTV Forward channel with a suitable multiple access uplink will reduce the standardization and deployment time for WRAN

• Modification required to existing ATSC-DL MAC in conformance with a new UL MAC and PHY are necessary.

• TxID watermark integration to mitigate potential interference problems.

• 802.22 Working Group encouraged to adopt ATSC-DTV for WRAN downlink technology

July 2005

Douglas Prendergast, CRC

Slide 17

doc.: IEEE 802.22-05/0063r0

Submission

References