1. July, 2010
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [DSA, promising access mechanism for future WPAN ]
Date Submitted: [9 July, 2010]
Source: [Shoichi Kitazawa, Kazuto Yano, Satoshi Tsukamoto, Tomohiro Miyasaka, Makoto Taromaru* and Masazumi Ueba] Company [ATR, * Currently with Fukuoka University]
Address [2-2-2, Hikaridai Seika, Kyoto, , JAPAN]
Voice:[ ], FAX: [ ],
Abstract: [In this presentation, We measured how spectrum is utilized in a situation where several radio systems are operated autonomously with high traffic loads. And we introduce concept of an access mechanism for future WPAN.]
Purpose: [Introduces the concept of an access mechanism for future WPAN.]
Notice: This document has been prepared to assist the IEEE P 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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Shoichi Kitazawa, ATR

2. DSA, promising access mechanism for future WPAN
July, 2010
DSA, promising access mechanism for future WPAN
Shoichi Kitazawa,
Kazuto Yano,
Satoshi Tsukamoto,
Tomohiro Miyasaka,
Makoto Taromaru*
Masazumi Ueba
(ATR, * Currently with Fukuoka University)
Shoichi Kitazawa, ATR

3. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
July, 2010
Introduction
2.4GHz ISM band is getting extremely crowded.
Coexistence with other system (Standard) should be considered in developing future WPAN.
High-traffic multi-system situations were measured in 2.4GHz band.
We introduce here DSA(Dynamic Spectrum Access).
Shoichi Kitazawa, ATR
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4. High-traffic multi-system analysis
July, 2010
High-traffic multi-system analysis
We measured how spectrum is utilized in a situation where several radio systems are operated autonomously with high traffic loads.
Four pairs of WLAN(11b) operate at ch. 1, 5, 9, and 13 and a pair of Bluetooth
Execute long file transfer with FTP.
Shoichi Kitazawa, ATR

5. Setup Configuration
Measurement system is setup in anechoic chamber (22.5m x 14.5m x 12m).
Scenario
Case1: All WLAN Link are same TX power
Case2: On of WLAN link is low TX power
Allocation of equipment
Photo of measurement system
Shoichi Kitazawa, ATR

6. Measurement results (Case1)
July, 2010
Measurement results (Case1)
Each AP transmits same power
WLAN and BT shearing radio resources
Still remain unused spectrum
ch1
ch5
ch9
ch13
ch1
ch5
ch9
ch13
After 1 min.
Shoichi Kitazawa, ATR

7. Measurement results (Case2)
July, 2010
Measurement results (Case2)
Transmission power of AP at ch. 13 reduced 10dB.
Bluetooth takes position of WLAN’s channel.
It makes more residual and useless radio resources and decreases spectral efficiency
ch1
ch5
ch9
ch13
ch1
ch5
ch9
ch13
WLAN stopped
After 2 min.
Shoichi Kitazawa, ATR

8. Concerns Fragmented narrow unused spectrum must be left uselessly.
July, 2010
Concerns
Fragmented narrow unused spectrum must be left uselessly.
How to utilize unused resources?
I want to transmit this ...
Though the summation of white space >W,
System3
can’t put in any spaces
System1
Syetem2
System4 W f
SRDs operating band
Shoichi Kitazawa, ATR

9. Dynamic Spectrum Access (DSA)
July, 2010
Dynamic Spectrum Access (DSA)
Realize Spectrally Efficient Use & Sharing of Radio Resources using Dynamic Spectrum Access/Assignment.
DSA will be promising access mechanism for future WPAN .
Shoichi Kitazawa, ATR

10. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
July, 2010
Conclusions
We experimentally observed spectrum use on high-traffic multi-system situation in 2.4GHz.
Measurement results shows unused spectrum still remains even in a situation thought as “the most efficient case.”
DSA will be promising access mechanism for future WPAN in ISM band.
Acknowledgment
This work is supported by the Ministry of Internal Affairs and Communications under a grant “Research and development on radio resource control technologies among multiple radio systems on same frequency band.”
Shoichi Kitazawa, ATR
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