1. Coexistence Scenarios
February 2009
Coexistence Scenarios
Date:
Authors:
Notice: This document has been prepared to assist IEEE ECSG on TV White Space. 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.
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Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

2. February 2009
Abstract
This presentation presents a set of coexistence scenarios for the TV white space
These scenarios are based on generic classes of networks.
Specific coexistence scenarios can be developed if projects begin in specific working groups
The only current project is within (WRAN)
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

3. FCC’s Classes of Devices
February 2009
FCC’s Classes of Devices
Fixed
Fixed outdoor antenna meters above ground
Geo-location and Internet access
Portable Mode I
Enabled from either a Fixed or Portable Mode II device
“Client Device”
Portable Mode II
“Access Point”
* Using the shorter term “portable” instead of the FCC term “personal/portable”
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

4. IEEE 802 Classes of Networks in TV White Space
February 2009
IEEE 802 Classes of Networks in TV White Space
Some of the following networks may ultimately operate in the TV white space
WRAN
Fixed-to-Fixed
WMAN
Fixed-to-Portable
WLAN
Portable-to-portable
WPAN
The “traditional” WPAN topology may not apply since one node must have direct Internet access
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

5. Network Class Definitions in this Document
February 2009
Network Class Definitions in this Document
WRAN
Fixed outdoor base station serving fixed clients (e.g )
WMAN
Fixed outdoor base station serving indoor and outdoor portable (Mode 1) clients
Could include and type networks
WLAN
Portable (Mode II) Access Point (AP) serving portable (Mode I) clients
AP must have Internet access and geo-location
Could include and possibly type networks
WAHN (Wireless Ad-Hoc Network)
Portable Mode I devices
No Internet Access
Sensing Only operation
Likely an type network
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

6. A Few Coexistence Scenarios
February 2009
A Few Coexistence Scenarios
Scenario Limited to Geometry and Class of Networks
Coexistence Scenario
Network A
Network B 1
WRAN
WMAN 2
WRAN or WMAN
WLAN or WAHN 3
WLAN
WAHN
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

7. February 2009
Coexistence Scenario 1
WRAN and WMAN base stations similar TX power and antenna gain
WRAN Client
(Fixed)
WMAN Client
(Portable)
TX Power 26 20
Antenna Gain 10
Building Penetration 15
WRAN has approximately 30 dB better uplink
WRAN has a much larger cell size
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

8. Coexistence Scenario 1 February 2009 Steve Shellhammer, Qualcomm

9. Coexistence Scenario 2 WRAN or WMAN outdoor base stations Either
February 2009
Coexistence Scenario 2
WRAN or WMAN outdoor base stations
Either
WRAN outdoor client
WMAN indoor client
WLAN or WAHN
Indoor devices
Therefore
Wall penetration between base stations and WLAN/WAHN
Wall penetration between WRAN client and WLAN/WAHN
Possibly no wall penetration between WMAN client and WLAN/WAHN if operated in the same home or office
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

10. Coexistence Scenario 2 February 2009 Steve Shellhammer, Qualcomm

11. Coexistence Scenario 3 WLAN indoors WAHN indoors
February 2009
Coexistence Scenario 3
WLAN indoors
WAHN indoors
Possible wall penetration between networks
Adjacent apartments
Another room in the home
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

12. February 2009
Comments
The number of available TV channels varies, depending upon the location
The number of channels that are available may also vary with time
Which specific channels are available also varies in both space and time
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm