doc.: IEEE 802.19-10/0087r0

Submission

June 2010

Alex Reznik (InterDigital)Slide 1

802.19 Tutorial – Use Case Draft 1

Notice: This document has been prepared to assist IEEE 802.19. 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.

Date: 2010-05-20

Name Company Address Phone email Alex Reznik InterDigital 781 Third Ave.,

King of Prussia, PA 19406 alex.reznik@interdigital.c

om

Authors:

doc.: IEEE 802.19-10/0087r0

Submission

Abstract

• Draft of my tutorial slides for July tutorial

• For discussion by the group

June 2010

Alex Reznik (InterDigital)Slide 2

doc.: IEEE 802.19-10/0087r0

Submission

June 2010

Alex Reznik (InterDigital)Slide 3

802.19 Tutorial – Plan as Agreed• Speakers Tuncer Baykas, Mika Kasslin, Steve Shellhammer, Alex

Reznik• Duration: 1hour 15minutes • Introduction to TVWS in US and other countries. (Steve

Shellhammer)– Available spectrum distribution– Protection of Primary users– Standardization activities 802 and ECMA…

• Need of coexistence in TVWS (Alex Reznik) – – NOW 10-15 MINUTES (to leave time for 11 and 22)– The case for Coexistence– Coexistence use cases– History of coexistence techniques in other bands and applicability to TVWS

• Propose to remove

• 802.19 TG1 and System Design Document (Tuncer Baykas)• Possible solutions to different aspects of the architecture (Mika

Kasslin)• Advertise the workshop

doc.: IEEE 802.19-10/0087r0

Submission

Coexistence in TVWS: What is it?

• TVWS presents a complex regulatory environment– Licensed devices: allowed to use the spectrum whenever,

following appropriate rules

– Unlicensed devices: permitted to use the spectrum when it is not occupied by licensed devices

• Licensed and unlicensed devices do not coexist– Licensed devices make no special allowances for unlicensed

devices

– Unlicensed device must “protect” licensed operation

• Protection of licensed devices is a medium access problem– Thou shall not access access spectrum when these guys are around

June 2010

Alex Reznik (InterDigital)Slide 4

doc.: IEEE 802.19-10/0087r0

Submission

Coexistence in TVWS: So what is it then?• Coexistence happens between peers

– In TVWS, these are unlicensed devices and networks

• Why do they need to coexist– Once available channels are known, the various networks and users need to

decide – who goes where– This cannot be static – channel availability will change

• Who specifies how this can be done– Some (not all) standards specify how different networks using same

technology coexist• 802.11, 802.15 do this• Do they do it well??

– Some standards don’t even do that• cellular standards do not specify how different operators use the same spectrum

– No MAC/PHY standard specifies how other MAC/PHY standards should behave

• Nor should one MAC/PHY do it – it would rule over all the others• This void is filled by standards such as 802.19.1 in TVWS

June 2010

Alex Reznik (InterDigital)Slide 5

doc.: IEEE 802.19-10/0087r0

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The Coexistence Problem: #1

• So many talkers …

• … and no common language to discuss sharing

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Alex Reznik (InterDigital)Slide 6

“… you know you could help me out here. If you are on WiFi, if you could just get off…”

“… we figured out why my demo crashed. Because there are 570 WiFi base stations operating in this room…”

Steve Jobs

see e.g.

http://www.youtube.com/watch?v=yoqh27E6OuU

doc.: IEEE 802.19-10/0087r0

Submission

The Coexistence Problem :#2

• Few people – many channels …

• Many people – few channel …

June 2010

Alex Reznik (InterDigital)Slide 7

Source: Mishra and Sahai, IEEE Comm. Letters, 2009

Source: Gerami, Mandayam, Greenstein. Report by Winlab, Rutgers U., 2010

doc.: IEEE 802.19-10/0087r0

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Operation in TV Bands: Why Deal With the Headache?

• TV Band Spectrum presents unique opportunities and possibilities

• Potentially a lot of spectrum– But availability not guaranteed

• Excellent propagation characteristics– Cover large distances– Penetrate walls, obstacles

• So what could this be used for – Find additional bandwidth for data networks (in those areas where TV channels are

many)– Offload to free up valuable (licensed spectrum)– Quick and cheap network deployment: cover a large area with few access points

and little planning– Cheap spectrum for applications requiring only intermittent communication

June 2010

Alex Reznik (InterDigital)Slide 8

doc.: IEEE 802.19-10/0087r0

Submission

Example Use Case 1: Home/Small Office

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Alex Reznik (InterDigital)Slide 9

Source: Sum et. al., IEEE doc. Scc41-ws-radio-10/5r0, IEEE SCC41 Ad Hoc on WS Radio Usage Models, 04/2010

doc.: IEEE 802.19-10/0087r0

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• Potential Uses– WLAN Access– Backhaul– Cellular offload

• Characteristics– Single operator owns the network and controls the space– Limited interference from like networks– Requires high data rates/no critical usage applications

• Is this a good fit for white spaces– Yes, if the channels are available– Yes, if the operator (home owner) can automate the channel selection

and coexistence of the various technologies he owns

June 2010

Alex Reznik (InterDigital)Slide 10

Example Use Case 1: Home/Small Office

doc.: IEEE 802.19-10/0087r0

Submission

Example Use Case 2: Apartment• Similar usage to the home use case,

but very different environment

• Multiple operators– Each resident operates own network– No incentive to cooperate/coordinate– WWAN network may be overlayed into

this space

• Little spatial separation between the operators

– Lots of networks crammed into a small spaces

– Opens the posibility of the iPhone4 demo problem

• Is this a good fit for white spaces– Maybe – but the inter-network

coexistence problem will definitely need to be solved.

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Alex Reznik (InterDigital)Slide 11

Celullar

WLAN AP

WLANHotSpot

Cellular Femtotell

Fixed WWAN

Source: Paine et. al., IEEE doc. 802.19-09/26r4, Whitespace Coexistence Use Cases, 07/2009

doc.: IEEE 802.19-10/0087r0

Submission

Example Use Case 3: Utility Grid

June 2010

Alex Reznik (InterDigital)Slide 12

Source: Sum et. al., IEEE doc. Scc41-ws-radio-10/5r0, IEEE SCC41 Ad Hoc on WS Radio Usage Models, 04/2010

doc.: IEEE 802.19-10/0087r0

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Example Use Case 3: Utility Grid • Potential uses

– Collection of metered data– Reporting of aggregated data over the backhaul– SCADA support

• Characteristics– Relative low-rate, can deal with intermittent outages– Single network operator, but spanning a large distance– High likelihood of interference with different network – this interference

varies in nature and spectral location throughout the network

• Is this a good fit for white spaces?– Absolutely– Covers large areas– Meters may need to penetrate obstacles– Requires only intermittent connectivity

June 2010

Alex Reznik (InterDigital)Slide 13

doc.: IEEE 802.19-10/0087r0

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Example Use Case 4: Public Safety

June 2010

Alex Reznik (InterDigital)Slide 14

doc.: IEEE 802.19-10/0087r0

Submission

Example Use Case 4: Public Safety• Potential Usage

– Rapid deployment of emergency personnel networks– Inter-personnel communication– Network backhaul– Communication to the main office

• Characteristics– High-rate data rate services– Multi-media and conversational services– Creating an “instant network” where there was none

• Is this a good match for white spaces– Yes: need to create a network with few APs and no ability to plan– Yes: need penetration through obstacles– Yes: need the reach the main office

June 2010

Alex Reznik (InterDigital)Slide 15