doc.: IEEE /0087r1 Submission July 2010 Alex Reznik (InterDigital)Slide Tutorial – Use Case Draft 1 Notice: This document has been prepared to assist IEEE 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: Authors:

doc.: IEEE /0087r1 Submission Abstract Draft of my tutorial slides for July tutorial For discussion by the group Alex Reznik (InterDigital)Slide 2 July 2010

doc.: IEEE /0087r1 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 by regulation Protection of licensed devices is a medium access problem –Thou shall not access access spectrum when these guys are around Alex Reznik (InterDigital)Slide 3 July 2010

doc.: IEEE /0087r1 Submission Coexistence in TVWS: So what is it then? Coexistence happens between peers –In TVWS, these are unlicensed devices and networks –Not mandated by regulations –Impetus must come from mutual benefit consideration: higher spectrum efficiency for all involved 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 , 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 in TVWS Alex Reznik (InterDigital)Slide 4 July 2010

doc.: IEEE /0087r1 Submission The Coexistence Problem: #1 So many talkers … … and no common language to discuss sharing Alex Reznik (InterDigital)Slide 5 “… 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. =yoqh27E6OuU July 2010

doc.: IEEE /0087r1 Submission The Coexistence Problem: #2 How we addressed in ISM bands –“Smart hopping” by Bluetooth –More robust (lower) bit rate by WiFi But such “autonomous” approaches may not work with and WiFi – can operate at up to 4W EIRP –WiFi does not frequency hop Alex Reznik (InterDigital)Slide Bluetooth So little spectrum … So many ways to use it … July 2010

doc.: IEEE /0087r1 Submission The Coexistence Problem :#3 Few people – many channels … Many people – few channel … Alex Reznik (InterDigital)Slide 7 Source: Mishra and Sahai, IEEE Comm. Letters, 2009 Source: Gerami, Mandayam, Greenstein. Report by Winlab, Rutgers U., 2010 July 2010

doc.: IEEE /0087r1 Submission 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 Alex Reznik (InterDigital)Slide 8 July 2010

doc.: IEEE /0087r1 Submission Example Use Case 1: Rural/Suburban Home/Small Office 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 July 2010

doc.: IEEE /0087r1 Submission Potential Uses –Device-to-Device (Machine-to-Machine) –WLAN Access –Backhaul –Cellular offload Characteristics –Single operator controls much of 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 Alex Reznik (InterDigital)Slide 10 Example Use Case 1: Rural/Suburban Home/Small Office July 2010

doc.: IEEE /0087r1 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 possibility 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. Alex Reznik (InterDigital)Slide 11 Source: Paine et. al., IEEE doc /26r4, Whitespace Coexistence Use Cases, 07/2009 July 2010

doc.: IEEE /0087r1 Submission Example Use Case 3: Utility Grid 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 July 2010

doc.: IEEE /0087r1 Submission 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 Alex Reznik (InterDigital)Slide 13 July 2010

doc.: IEEE /0087r1 Submission Example Use Case 4: Public Safety Alex Reznik (InterDigital)Slide 14 Source: Sum et. al., IEEE doc. Scc41-ws-radio-10/5r0, IEEE SCC41 Ad Hoc on WS Radio Usage Models, 04/2010 July 2010

doc.: IEEE /0087r1 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, IF spectrum can be found, need to have backup plans. –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 Alex Reznik (InterDigital)Slide 15 July 2010