July, 2010 Project: IEEE P802.15 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, 619-0288, JAPAN] Voice:[+81 774951511], FAX: [+81 774951508], E-Mail:[kitazawa@atr.jp] 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 P802.15. 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. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Shoichi Kitazawa, ATR

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

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<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 <author>, <company>

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

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

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

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

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

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

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<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 <author>, <company>