Transcript https://mentor.ieee.org/802.19/dcn/10/19-10-0087-00-0001-use-case-tutorial-slides-draft.ppt

June 2010
doc.: IEEE 802.19-10/0087r0
802.19 Tutorial – Use Case Draft 1
Date: 2010-05-20
Authors:
Name
Alex Reznik
Company
Address
InterDigital
781 Third Ave.,
King of Prussia, PA 19406
Phone
email
[email protected]
om
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.
Submission
Slide 1
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
Abstract
• Draft of my tutorial slides for July tutorial
• For discussion by the group
Submission
Slide 2
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
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
Submission
Slide 3
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
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
Submission
Slide 4
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
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
Submission
Slide 5
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
The Coexistence Problem: #1
“… 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
• So many talkers …
• … and no common language to discuss sharing
Submission
Slide 6
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
The Coexistence Problem :#2
Source: Mishra and Sahai, IEEE Comm. Letters, 2009
• Few people – many channels …
Source: Gerami, Mandayam, Greenstein.
Report by Winlab, Rutgers U., 2010
• Many people – few channel …
Submission
Slide 7
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
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
Submission
Slide 8
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
Example Use Case 1: Home/Small Office
Source: Sum et. al., IEEE doc. Scc41-ws-radio-10/5r0, IEEE SCC41 Ad Hoc on WS Radio Usage Models, 04/2010
Submission
Slide 9
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
Example Use Case 1: Home/Small Office
• 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
Submission
Slide 10
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
Example Use Case 2: Apartment
•
Similar usage to the home use case,
but very different environment
•
Multiple operators
–
–
–
WLAN AP
Cellular
Femtotell
•
Little spatial separation between the
operators
–
WLAN
HotSpot
–
Celullar
Fixed WWAN
•
Submission
Slide 11
Lots of networks crammed into a small
spaces
Opens the posibility of the iPhone4 demo
problem
Is this a good fit for white spaces
–
Source: Paine et. al., IEEE doc. 802.19-09/26r4,
Whitespace Coexistence Use Cases, 07/2009
Each resident operates own network
No incentive to cooperate/coordinate
WWAN network may be overlayed into
this space
Maybe – but the inter-network
coexistence problem will definitely need
to be solved.
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
Example Use Case 3: Utility Grid
Source: Sum et. al., IEEE doc. Scc41-ws-radio-10/5r0, IEEE SCC41 Ad Hoc on WS Radio Usage Models, 04/2010
Submission
Slide 12
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
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?
–
–
–
–
Submission
Absolutely
Covers large areas
Meters may need to penetrate obstacles
Requires only intermittent connectivity
Slide 13
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
Example Use Case 4: Public Safety
Submission
Slide 14
Alex Reznik (InterDigital)
June 2010
doc.: IEEE 802.19-10/0087r0
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
Submission
Slide 15
Alex Reznik (InterDigital)