WLAN WLAN AP WLAN WLAN WLAN AP- WLAN SINR WLAN WLAN CE WLAN WLAN WLAN CE 2 3 WLAN 4 WLAN 2. WLAN [10] AP CE [11] AP CE CE [12] CE AP AP AP WLAN WLAN A

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1 DEIM Forum2015 C2-4 LAN NEC LAN AP AP LAN LAN LAN WLAN AP- WLAN 3 LAN LANQoS Quality Improvement for Densely Deployed Mobile Wireless LAN with Different Property Mitomo ISOMURA, Kazunori MIYOSHI, Tutomu MURASE, and Masato OGUCHI Ochanomizu University Otsuka Bunkyo-Ku Tokyo Japan NEC Corporation 1753 Shimonumabe Nakahara-ku Kawasaki Kanagawa Japan mitomo@ogl.is.ocha.ac.jp, {miyoshi,t-murase}@ap.jp.nec.com, oguchi@computer.org 1. LAN(WLAN) WLAN AP ( )WLAN AP WLAN WLAN WLAN WLAN CSMA/CA AP WLAN (CE) CE CE (Signal to Intereference Noise Ratio, SINR) CE 1

2 WLAN WLAN AP WLAN WLAN WLAN AP- WLAN SINR WLAN WLAN CE WLAN WLAN WLAN CE 2 3 WLAN 4 WLAN 2. WLAN [10] AP CE [11] AP CE CE [12] CE AP AP AP WLAN WLAN AP WLAN WLAN [1] CE AP WLAN WLAN (SNIR) CE CE [2] [3] WLAN WLAN WLAN [4] CE WLAN WLAN CE 3 WLAN 4.1 AP- 4.2 WLAN WLAN 3. 1 WLAN, CE WLAN WLAN [5] WLAN CE 3 (1) 2 AP (2)1 1 (3) AP WLAN (3) 3. 2 WLAN WLAN WLAN CE WLAN CE [1] 1 20cm 20cm 16 40cm 16 20cm % 60cm 16 80cm 16 60cm 16 11% 1 WLAN 2

3 3. 3 WLAN WLAN WLAN AP-,WLAN WLAN CE WLAN CE WLAN WLAN WLAN WLA WLAN WLAN WLAN SINR CE WLAN WLAN WLAN SINR CE (2) AP- AP- WLAN WLA AP- WLAN WLA SINR CE (2) WLAN (1 AP ) WLAN WLAN (1) WLAN WLAN WLAN WLAN CE WLAN CE WLAN WLAN WLAN. AP 1 1 WLAN AP 5cm WLAN WLAN 2 / 1 WLAN 40, 60, 80, 120cm 2 WLAN 3 2 WLAN 4. WLAN 3 WLAN 4.1 AP- 4.2 WLAN 4.3 ( ) 2 WLAN CE UDP uplink WLAN IEEE802.11g (4.3 ) 4. 1 WLAN WLAN WLAN WLAN CE WLAN 2 WLAN 1 WLAN 3 WLAN 4 x y 13% cm cm cm cm 7 240cm cm 3

4 CE WLAN WLAN N CE WLAN N/2 5 1 WLAN 5 WLAN cm 22.2Mbps 8 40cm 28.35Mbps CE WLAN AP-WLAN WLAN. AP 1 1 WLAN WLAN 1m AP- 20, 30, 60cm 6 WLAN 7 4 WLAN 6 AP- 5 WLAN WLAN 7 WLAN 4. 2 AP- AP- WLAN AP- CE AP- 2 WLAN 1 WLAN AP- WLAN(=CE ) CE WLAN WLAN AP-WLAN CE WLAN 8 X y AP- 60cm 37% AP- CE 4. 3 WLAN WLAN WLAN CE WLAN 2 WLAN WLAN 4

5 4 WLAN WLAN WLAN CE 8 AP- WLAN WLAN WLAN ( ) CE. AP 5cm WLAN 1m WLAN 4 WLAN 9 8 WLAN 10 WLAN 11 9 WLAN WLAN 10 WLAN WLAN 8 11 WLAN 12 x y 8 WLAN 2.5 (250%) WLAN CE 12 WLAN 5. LAN(WLAN) (CE) WLAN 3 WLAN AP- WLAN 2 WLAN ( ) WLAN ( ) CE AP- WLAN 2 37% 250% [1] WLAN (DICOMO2013) 8B-1 pp [2] Masashi Iwabuchi Akira Kishida Toshiyuki Shintaku Tetsu Sakata: A Study on Autonomous Matching Method for Distributed Cooperative Meduim Access Control IEICE Technical Report RCS (2013) [3] Kenji Takahashi Hiroyasu Obata Tutomu Murase Kenji Ishida Throughput Improvement Method Exploiting Capture Effect in Densely Placed WLANs ACM IMCOM2015 Jan 2015 [4] Ayaka Moriuchi, Tutomu Murase, Masato Oguchi, Akash Baid, Shweta Sagari, Ivan Seskar, and Dipankar Raychaudhuri: Measurement Study of Adjacent Channel Interference in Mobile WLANs In Proc. the International Workshop on Green Broadband Access (GBA2013) in conjunction with the IEEE International Conference on Communications (ICC2013), pp , Budapest, Hungary, 5

6 June [5] Mitomo Isomura, Kazunori Miyoshi, Tutomu Murase, Masato Oguchi, Shweta Sagari, Akash Baid, Ivan Seskar, Dipankar Raychaudhuri, Measurment and Analysis on QoS of Wireless LAN Densely Deployed with Transmission Rate Control, IEEE WCNC2015, MWN-P04, Mar [6] Planex MZK-MF300N: planex.co.jp/product/ router/mzk-mf300n/ [7] Nexus S: nexus-s [8] Wifi Analyzer: [9] iperf: iperf/2.0.4sourc e/iperf tar.gz/download [10] Martin Heusse, Franck Rousseau, Gilles Berger-Sabbatel, Andrzej Duda, Performance Anomaly of b, INFOCOM 2003, pp vol.2, March April [11] Shweta Sagari, Akash Baid, Ivan Seskar, Tutomu Murase, Masato Oguchi, Dipankar Raychaudhuri, Performance Evaluation of Mobile Hotspots in Densely Deployed WLAN Environments, IEEE PIMRC2013, pp , Sep [12] Christine Thorpe and Liam Murphy, A Survey of Adaptive Carrier Sensing Mechanisms for IEEE Wireless Networks, Communications Surveys & Tutorials, IEEE(Volume:PP, Issue: 99), pp. 1280, March

DEIM Forum 2017 H2-2 Android LAN Android 1 Android LAN

DEIM Forum 2017 H2-2 Android LAN 112-8610 2-1-1 163-8677 1-24-2 E-mail: {ayano,oguchi}@ogl.is.ocha.ac.jp, sane@cc.kogakuin.ac.jp Android 1 Android LAN Ayano KOYANAGI, Saneyasu YAMAGUCHI, and Masato OGUCHI