1. Media Independent Coexistence for Devices in TV White Spaces
June 2009
Media Independent Coexistence for Devices in TV White Spaces
Date:
Authors:
Name
Company
Address
Phone
Haiguang Wang
Hisilicon, Huawei
KuiKe Building, No.9 Xinxi Rd. Shang-Di, Hai-Dian District, Beijing P.R.China
Shulan Feng
Jinnan Liu
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Haiguang Wang, Shulan Feng, Jinnan Liu
Apurva N Mody (BAE Systems), Ranga Reddy (US Army)

2. June 2009
Abstract
This contribution propose a to use Media Independent Coexistence mechanism to solve the coexistence of the heterogeneous devices in TV White Spaces.
We propose to use a centralized spectrum manager to manage the spectrum.
We propose to consider the possibility of further dividing the 6MHz TV Channels into more sub-channels. Heterogeneous devices can be put in different sub-channels. This can avoid the interference among heterogeneous devices in TV White Space efficiently. It is suitable for the coexistence of fixed and portable devices.
Haiguang Wang, Shulan Feng, Jinnan Liu
Apurva N Mody (BAE Systems), Ranga Reddy (US Army)

3. Possible Networks/Devices in TV White Space
June 2009
Possible Networks/Devices in TV White Space
WRAN
4W with database access
802.22/802.16/non-802
Cellular
100mW to 4W with database access
802.16/non-802
Wi-Fi/Femto cell equipment
100mW or 40mW with database access
802.11/non-802
PAN/BAN
50mW with spectrum sensing only capability.
802.15/non-802
Wireless Microphone
May use white space
Slide 3
Haiguang Wang, Shulan Feng, Jinnan Liu

4. June 2009
A generic co-existence scenarios for TV White Space Networks/Devices [1]
Slide 4
Haiguang Wang, Shulan Feng, Jinnan Liu

5. June 2009
Observations
The coexistence issue is quite complex in the TV White Spaces as so many devices may co-located in the same places.
We should consider to solve the generic coexistence scenario specified in previous slides step-by-step.
Slide 5
Haiguang Wang, Shulan Feng, Jinnan Liu

6. Steps to Solve Coexistence Issues
Step 1: Coexistence among fixed and portable devices.
Fixed and portable type II devices can access the database via Internet
They can also provide geo-location information.
Portable type I devices are under the control of portable type II/fixed devices.
Step 2: Coexistence among devices only with spectrum sensing capability.
FCC allow this type of device to use the spectrum, but need pass the FCC test.
As no such device is available yet. Should we address this issue?
Step 3: Coexistence among fixed, portable and spectrum sensing only devices.
Slide 6
Haiguang Wang, Shulan Feng, Jinnan Liu

7. Possible Coexistence Mechanisms
Time Division Multiplexing (TDM)
802.16h: coexist of and
Spectrum may not be full utilized as different standard has different spectrum policy.
802.11: minimum bandwidth 5 MHz
May have difficulties to coexist with standards defined in the future.
Frequency Division Multiplexing (FDM)
A possible direction.
Should we consider further divide the 6 MHz channels into narrow bands such as 1MHz or 2 MHz?
Code Division Multiplexing (CDM)
Seems not a applicable as significant changes are required at physical layer.
Slide 7
Haiguang Wang, Shulan Feng, Jinnan Liu

8. Media Independent Coexistence (MIC)
Proposed by in March by Carlos and Joe [2].
Manages the spectrum via higher layer transport protocols.
Suitable for the coexistence of fixed and portable devices.
Consider the possibility of adding in a spectrum manager and helping the spectrum allocation.
Accept spectrum request from TVBDs.
Allocate spectrums according to the request and information from database. The information can be geo-location, interference range of devices etc.
Consider to further divide a TV channel into more sub-channels
Devices belong to the same standard can use the same sub-channel.
Devices belong to different standard use the different sub-channels. No interference among heterogeneous devices
Slide 8
Haiguang Wang, Shulan Feng, Jinnan Liu

9. Critical Issues to Solve before Using MIC Mechanism
Allowing to use centralized spectrum manager.
Supporting flexible bandwidth by individual standard.
Identifying the neighboring devices.
Can we require each device reporting parameters of their radios and find the interference range of each radio?
Define a common protocol for spectrum management
Define a spectrum contention mechanism
That can be used at the centralized spectrum manager for spectrum contention.

10. Pros and Cons With MIC+FDM
FDM is an universal coexistence mechanism.
Can easily coexist the protocols designed in the future as long as they support flexible bandwidth defined by the coexistence mechanism.
Interference among heterogeneous devices can be avoided.
MIC can simplify the bandwidth contention mechanism.
Cons??
Do we need more guard band to avoid interference?
TDM also need guard band at two side of the channel. It also need synchronization in transmissions. This also leads to over head in time domain.

11. Month Year
doc.: IEEE yy/xxxxr0
June 2009
Conclusions
In this proposal, we propose to use Media Independent Coexistence and Frequency Division Multiplexing mechanism to solve the coexistence issue in the TV White Spaces. The advantages of this method is the interference among heterogeneous devices can be fully avoided.
Haiguang Wang, Shulan Feng, Jinnan Liu
John Doe, Some Company

12. Month Year
doc.: IEEE yy/xxxxr0
June 2009
References
[1] Richard Paine, Mark Cummings, Alex Reznik, “White Space Coexistence Use Cases”, June 6, 2009.
[2] Juan Carlos Zunija, Joseph Kwak, “ Media Independent Coexistence”, March 12, 2009
Haiguang Wang, Shulan Feng, Jinnan Liu
John Doe, Some Company