先進的計算基盤システムシンポジウム SACSIS2012 Symposium on Advanced Computing Systems and Infrastructures SACSIS /5/17 Android LAN TCP Android. TCP A Proposal

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1 Android LAN TCP Android. TCP A Proposal of TCP Control Method based on its Environment for Wireless Access of Android Terminals and Development of Communication Control Middleware KAORI MIKI, HIROMI HIRAI, SANEYASU YAMAGUCHI and MASATO OGUCHI In recent years, with the rapid growth of smart phone market, Android attracts attentions as software platform of embedded system. Previous mobile phones control network communication individually and independently. Some studies have been performed so far improve communication behavior in such a way. It becomes possible that a mobile terminal can exchange information among terminals and control in a cooperative way. Because recent phones, especially smart phones which is called high performance mobile phone, come to have better performance. In this paper, on the premise of such cooperation, we propose middleware which uses original method of communication that considers around condition and uses bandwidth effectively. 1. Android 1). 2) 3) LAN Ochanomizu University Kogakuin University Android 4) TCP 11) 176

2 2 TCP TCP Android 2 TCP 6 TCP 7 8 ROM ROM Android LAN TCP Android Android TCP-CUBIC 5) TCP TCP-CUBIC TCP 6)7) Congestion Notification Loss Notification Linux 8) 1 1 Android Android Android TCP 2.2 TCP TCP TCP TCP TCP 2 TCP TCP TCP 177

Android HTC HT-03A ( A) Samsung Nexus S ( B) 2 TCP 3 TCP Android 1 TCP TCP TCP 4 6 3 TCP 4 5 6 4 TCP 1 Experimental Environment A Model number HT-03A Firmware

3 TCP 10) TCP TCP Android HTC HT-03A ( A) Samsung Nexus S ( B) 2 TCP 3 TCP Android 1 TCP TCP TCP TCP TCP 1 Experimental Environment A Model number HT-03A Firmware version 2.1-update1 Baseband version 62.50S.20.17H_ I Kernel version ga8089eb-dirty Build number aosp_sapphire_us-eng 2.1-update1 ERE27 B Model number Nexus S Firmware version Baseband version I9023XXKD1 Kernel version kaori1198-ge382d80-dirty Build number GRJ22 OS Fedora release 10 (Cambridge) CPU Intel(R) Pentium(R) 4 CPU 3.00GHz Main Memory 1GB 1. iperf ) Android. arm- 2008q3 13). 3 3 IEEE802.11g 2 Android 4 LAN

4 2 4. A 2009 B 2010 Android A B TCP 16ms A 10Mbps B 20Mbps A B 1:2 1:2 A 2 B g 54Mbps B 20Mbps 1:2 A 4. TCP TCP RTT B A TCP TCP 0 default 20 original 70 1 default 20 original 70 2 default 20 original 70 4 default 20 original 70 8 default 20 original default 20 original default 30 original default 55 original default 55 original default 100 original 100 TCP default OS TCP TCP original TCP 3.2 default original 2 B OS A TCP TCP A B

A TCP 2 A B TCP. A TCP TCP- CUBIC TCP B TCP. 5.

5 A TCP 2 A B TCP. A TCP TCP- CUBIC TCP B TCP A 4 B TCP CA_STATE A B 4 8 B 4 Open 1 4 Disorder CWR Recovery Loss 9 A 4 CA_STATE 7 A A B CA_STATE 9 10 A B 4 CA_STATE CA_STATE TCP 0 10 B 4 CA_STATE 9 10 A B 180

6 A B B TCP 3 A A B TCP TCP 6. TCP A A B TCP. A TCP B 6.1 B A TCP B TCP TCP B B TCP A TCP B B A B A TCP B TCP A TCP TCP A B 3 B TCP RTT 3 TCP 2 B A TCP TCP 0 A TCP 30 default 70 1 A TCP 30 default 70 2 A TCP 35 default 70 4 A TCP 35 default 70 8 A TCP 35 default A TCP 40 default A TCP 50 default A TCP 65 default A TCP 80 default A TCP 80 default 70 A Android 3 11 B TCP A 4 OS A: B 1:2 3.5(Mbps):7(Mbps) TCP B A B A TCP OS TCP proc Android Dalvik VM 181

Android 30 3 Android 50 A 1 10 1 TCP TCP

7 Android Android C bionic UDP A A B TCP TCP 13 B A 50 B 3 TCP 3 TCP Android TCP A B RTT=8ms 14 1 A Android 30 3 Android 50 A TCP TCP 2 TCP 3 3 TCP TCP 7.3 TCP Android (s) A B 1 2 B A B A B TCP A 182

15 1: 16 2: 2 B A 1 TCP TCP 8. Android Android. Android TCP TCP TCP TCP TCP KDDI 1) Android:http://www.google.co.jp/mobile/android 2). MBL [ ] 09196072 no.44 pp7-12 May 2007. 3).

4) Kaori Miki, Saneyasu Yamaguchi, and Masato Oguchi: Kernel Monitor of Transport Layer Developed for Android Working on Mobile Phone Terminals, In Proc.

8 15 1: 16 2: 2 B A 1 TCP TCP 8. Android Android. Android TCP TCP TCP TCP TCP KDDI 1) Android: 2). MBL [ ] no.44 pp7-12 May ). EIP [ ] no.11 pp1-7 September ) Kaori Miki, Saneyasu Yamaguchi, and Masato Oguchi: Kernel Monitor of Transport Layer Developed for Android Working on Mobile Phone Terminals, In Proc. the Tenth International Conference on Networks (ICN2011), pp , St. Maarten, The Netherlands Antilles, January ) Sangtae Ha, Injong Rhee, and Lisong Xu, CUBIC: A New TCP-Friendly High-Speed TCP Variant ACM SIGOPS Operating Systems Review, Volume 42 Issue 5, pp.64-74, July ) Luigi A. Grieco Politecnico di Bari, and Saverio Mascolo Performance evaluation and comparison 183

9 of Westwood+, New Reno, and Vegas TCP congestion control ACM SIGCOMM Computer Communication Review Volume 34 Issue 2, April ) Habibullah Jamal and Kiran Sultan, Performance Analysis of TCP Congestion Control Algorithms International Journal of Computers and Communications, Issue 1, Volume 2, pp.30-38, ) Sally Floyd TCP and Explicit Congestion Notification ACM SIGCOMM Computer Communication Review, ) Hasegawa Go, Murata Masayuki, Transport-layer protocols for high-speed and log-delay networks The Institute of Electronics, Enformation and Communication Engineers, Technical Committee Conferences,February ) Android LAN (DICOMO2011) 7H-2 pp ) LAN TCP Android DEIM2012 C ) Iperf: 13) Sourcery G++ Lite 2008q-3-72 for ARM GNU/Linux: codesourcery.com/, /portal/release

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