IPSJ SIG Technical Report Vol.2012-ITS-50 No /9/10 Wi-Fi G 3G Wi-Fi Wi-Fi Wi-Fi Wi-Fi Offloading Method for Outdoor Mobile Users using
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1 Wi-Fi G 3G Wi-Fi Wi-Fi Wi-Fi Wi-Fi Offloading Method for Outdoor Mobile Users using Smartphones in Vehicles as Moving Access Points Abstract: With the increasing popularity of smart-phone, 3G networks are currently overloaded with mobile data traffic. Due to this explosion of data traffic, communication quality deteriorates and communication failure occurs. To solve this problem, there have been proposed Wi-Fi offloading methods to offload mobile data traffic to WiFi network. However, there is a problem that outdoor mobile users like a waking pedestrian cannot offload mobile data, while they are out of Wi-Fi access area. In this paper, we propose a new WiFi offloading method which uses the vehicle passing near the user as a relay node. In addition, we focus on the fact that contact duration between vehicles and pedestrians is likely to be longer near the intersection. In order to increase the probability of successful data reception at a mobile user from the Internet, we propose a method which selects a vehicle with a higher probability of encountering the mobile user. 1. 3G 3G 1 Nara Institute of Science and Technology 2 Tokyo University of Science, Yamaguchi 3G 3G 3G 2 3.9G 4G Wi-Fi Wi-Fi Wi-Fi AP 100 Wi-Fi AP Wi-Fi 3G Wi-Fi 3G c 2012 Information Processing Society of Japan 1
2 Wi-Fi AP 3G Wi-Fi Wi-Fi 3G Wi-Fi AP Wi-Fi [1] Wi-Fi AP Wi-Fi Wi-Fi AP Wi-Fi Wi-Fi AP Wi-Fi Wi-Fi AP Wi-Fi AP 3G Wi-Fi AP Wi-Fi [1], [2], [3], [4], [5], [6], [7] Wi-Fi AP 3G Balasubramanian [1] Wiffler Wiffler Wi-Fi AP AP Wi-Fi AP 3G Deshpande[5] Wi-Fi AP Wi-Fi AP Wi-Fi AP [8], [9] Kyunghan [8] 65% Pralhad [9] Wi-Fi AP c 2012 Information Processing Society of Japan 2
![1 Wi-Fi Wi-Fi AP [10] 3. Wi-Fi Wi-Fi 3G 3.1 3.1.1 1 U S s S Wi-Fi AP Wi-Fi AP AP A a A Wi-Fi AP WI-Fi AP AP Wi-Fi AP SSID Wi-Fi AP 3.1.2 Web 3.1.3 I E G=(I,E) i I P i (road b, road a ) road b road a road b D Σ roada DP i (road b, road a ) = 1 i, j i j t (i,j) E T 3.](/docs-images/102/153180214/images/3-0.jpg "1.4 Wi-Fi 3G E I G GPS Wi-Fi c 2012 Information Processing Society of Japan 3")
3 1 Wi-Fi Wi-Fi AP [10] 3. Wi-Fi Wi-Fi 3G U S s S Wi-Fi AP Wi-Fi AP AP A a A Wi-Fi AP WI-Fi AP AP Wi-Fi AP SSID Wi-Fi AP Web I E G=(I,E) i I P i (road b, road a ) road b road a road b D Σ roada DP i (road b, road a ) = 1 i, j i j t (i,j) E T Wi-Fi 3G E I G GPS Wi-Fi c 2012 Information Processing Society of Japan 3
4 (a) (b) G ( 2(a) ) ( 1 ) Wi-Fi AP AP ( 2 ) Wi-Fi AP Wi-Fi AP ( 3 ) 3G ( 4 ) ( 2(b) ) ( 1 ) 3G GPS Wi-Fi SSID ( 2 ) ( 3 ) Wi-Fi AP Wi-Fi AP ( 4 ) Wi-Fi AP AP Wi-Fi AP SSID ( 5 ) Wi-Fi AP SSID SSID AP ( 6 ) 3G c 2012 Information Processing Society of Japan 4
5 u i s m s m Wi-Fi AP u i s m u i s m Wi-Fi AP s m Wi-Fi AP u i s m u i s m 4. Wi-Fi ( 1 ) 3G ( 2 ) d user d user t enc 5 ( 3 ) Wi-Fi AP Wi-Fi AP AP ( 4 ) AP a a d car t enc a t enc d car a c 2012 Information Processing Society of Japan 5
![5 t relay 5 a ( 5 ) t relay a t relay a ( 6 ) a t enc ( 7 ) 3G (i) d user d car (ii) AP (iii) 4.2.1 d user d car [11] d user d car 3G GPS d user d user d user [12] d car 4.2.2 AP AP AP AP AP AP AP AP AP AP AP AP a a a i 1 i k i 1 i k i 1, i 2,.](/docs-images/102/153180214/images/6-0.jpg ".., i k i 1 i k fc k 2 fc(1, k) = P ((i j, i j+1 ), (i j+1, i j+2 )). (1) j=1 P ((i i, i j ), (i j, i k )) i i i j i j i k a /sec a i k ta ta = t 1,2 fc(1, k).")
6 5 t relay 5 a ( 5 ) t relay a t relay a ( 6 ) a t enc ( 7 ) 3G (i) d user d car (ii) AP (iii) d user d car [11] d user d car 3G GPS d user d user d user [12] d car AP AP AP AP AP AP AP AP AP AP AP AP a a a i 1 i k i 1 i k i 1, i 2,..., i k i 1 i k fc k 2 fc(1, k) = P ((i j, i j+1 ), (i j+1, i j+2 )). (1) j=1 P ((i i, i j ), (i j, i k )) i i i j i j i k a /sec a i k ta ta = t 1,2 fc(1, k). (2) t 1,2 a i 1 i 2 Wi-Fi AP AP (2) AP AP AP 1 2 AP AP 1 c 2012 Information Processing Society of Japan 6
7 AP AP (2) AP AP 1 t relay AP 1 AP i 1 fc(1, k) N 1 i k q 1 NIC Athrm 5.2km/h WL54AG (km/h) madwifi ( Mbps ) iperf (Byte) LAN g IP (go), (come) UDP ( km/h ) q = 1 (1 fc(1, k)) N. (3) q α q α N AP N Mbps 20km/h km/h /2 6 24Mbps (come) 40km/h 20km/h 1024Byte 7824KByte 1776KByte 1Mbps Mbps Mbps ( 0 ) 8 20km/h c 2012 Information Processing Society of Japan 7
8 24Mbps 20km/h KByte 54Mbps 20km/h Wi-Fi AP : Wi-Fi AP Wi-Fi AP km/h 3G Wi-Fi Scenargie Sumo Open Street Map Wi-Fi AP Wi-Fi Web 3G Wi-Fi AP : [1] A. Balasubramanian, R. Mahajan, and A. Venkataramani: Augmenting Mobile 3G Using WiFi, In Proc. of MobiSys 10, pp , [2] P. Deshpande, A. Kashyap, C. Sung, and Samir R.Das: Predictive Methods for I,proved Vehicular WiFi Access, In Proc. of MobiSys 09, pp , [3] A. Balasubramanian, R. Mahajan, A. Vekataramani, B. Neil Levine, and J. Zahorjan: Interactive WiFi Connectivity For Moving Vehicles, In Proc. of SIGCOMM, pp , [4] J. Jeong, S. Guo, Y. GU, T. He, and D. H.C Du: TSF:Trajectory-based Statistical Forwarding for Infrastructure-to-Vehicle Data Delivery in Vehicular Networks, In Proc. of ICDCS, pp , [5] J. Eriksson, H. Balakrishnan, and S. Madden: Cabernet: Vehicular Content Delivery Using WiFi, In Proc. of MobiCom, pp , [6] Z. Zheng, Z. Lu, P. Sinha, and S. Kumar: Maximinzing the Contact Opportunity for Vehicular Internet Access, In Proc. of INFOCOM, pp , [7] A. Balasubramanian, Y. Zhou, B. Croft, B. Neil Levine, and A. Venkataramani: Web Search From a Bus, In Proc. of CHANTS, pp , [8] K. Lee, I. Rhee, J. Lee, S. Chong, and Y. Yi: Mobile Data Offloading: How Much Can WiFi Deliver?, In Proc. of Co-Next, pp , [9] P. Deshpande, X. Hou, and S. R.Das: Performance Comparison of 3G and Metro-Scale WiFi for Vehiclular Network Access, In Proc. of IMC,pp , [10],,, : Wi-Fi In Proc. of DICOMO2012, pp , [11] Goldman, J., Shilton, K., Burke, J., Estrin, D., Hansen, M., Ramanathan, N., Reddy, S., Samanta, V. and Srivastiva, M.: Participatory Sensing: A citizenpowered approach to illuminating the patterns that shape our world, Foresight &Governance Project, White Paper (2009). [12] R. K. Balan, N. X. Khoa, and L. Jiang: Real-Time Trip Information Service for a Large Taxi Fleet, In Proc. of MobiSys, pp , c 2012 Information Processing Society of Japan 8
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25 Estimation scheme of indoor positioning using difference of times which chirp signals arrive 114348 214 3 6 , (GPS: Global Positioning Systemg),.,, (LBS: Local Based Services).. GPS,.,. RFID LAN,.,.,.,,,.,..,.,.,,,
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GPGPU 2013 1008 2015 1 23 Abstract In recent years, with the advance of microscope technology, the alive cells have been able to observe. On the other hand, from the standpoint of image processing, the
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ABSTRACT The Social Function of Boys' Secondary Schools in Modern Japan: From the Perspectives of Repeating and Withdrawal TERASAKI, Satomi (Graduate School, Ochanomizu University) 1-4-29-13-212, Miyamaedaira,
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25 Study on Rating System in Multi-player Games with Imperfect Information 1165069 2014 2 28 2 ( ) i ii Abstract Study on Rating System in Multi-player Games with Imperfect Information Shigehiko MORITA
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