佐藤 拓朗　教授SATO, Takuro　Professor

論文

1 Yi Jiang, Zhenyu Zhou, Gen-ichiro Ohta and Takuro Sato, “Pilot Single Side-band Modulation for Robust OFDM Communications in Highly Dispersive

Channels”, Transaction of the Japan Soceity fro Simulation Technology, June 2013.

【要約】In this paper, we present a new modulation scheme for transmission over OFDM, named Pilot-Single Sideband modulation （P-SSB）, enabling data transmission even in channels with very low correlation levels in both frequency and time domains. P-SSB modulation achieves this feat through the combined use of the particular properties of the Hilbert. Transform and the powerful decoding abilities of turbo-equalizers. We show that in the case of QPSK constellation with transmission over OFDM, the pro-posed modulation scheme enables reliable data transmission in channel conditions where other transceiver designs fail. Finally, we establish by mean of numerical performances evaluation the existence of the operation region in which the proposed scheme is preferable to conventional pilot-based transmission schemes and present useful metrics to determine its boundaries.

2 Arifuzzaman M, Matsumoto M, and Sato T, “An Intelligent Hybrid MAC With Traffic-Differentiation-Based QoS for Wireless Sensor Networks”,

Sensors Journal, IEEE, Volume: 13, Issue: 6; Page（s）: 2391- 2399, June 2013.

【要約】In this paper, we present the Intelligent Hybrid MAC （IH-MAC）, a novel low power with quality of service guaranteed medium access control protocol for wireless sensor networks （WSNs）. The IH-MAC achieves high energy efficiency under wide range of traffic load. It ensures shorter latency to critical and delay-sensitive packets. The IH-MAC protocol achieves high channel utili-zation during high traffic load without compromising energy efficiency. The IH-MAC does it by using the strength of CSMA and TDMA approach with intelligence. The novel idea behind the IH-MAC is that it uses both the broadcast scheduling and link scheduling. Depending on the network loads, the IH-MAC protocol dynamically switches from broadcast scheduling to link scheduling and vice versa in order to achieve better efficiency. The scheduling is done in the IH-MAC with a novel decentralized approach where the nodes locally use the clock arithmetic to find the time slot, allocated for it. Furthermore, the IH-MAC uses Request-To-Send, Clear-To-send handshakes with methods for adapting the transmit power to the minimum level necessary to reach the intended neighbor. Thus, the IH-MAC reduces energy consumption by suitably varying the transmit power. The IH-MAC also uses the concept of parallel transmission that further reduces delay. The analytical and simulation results corroborate the theoretical idea, and show the efficiency of our proposed protocol.

3 Yanwei Li, Zhenyu Zhou and Takuro Sato, “Cell Selection and Resource Allocation for Macro Cell-edge Users with Proportional Guarantee

Throughputs in Macro-Femto Network”, Transaction of the Japan Society for Simulation Technology, Vol. 5, No. 2, pp. 11-19, April 2013.

【要約】The macro cell-edge users （MCEUs） suffer from low data rate due to the high path loss and strong co-channel interference from nearby femtocells. In this paper, we address the optimal resource allocation problem for MCEUs in the heterogonous Macro-Femto network. A femto base station （FBS） is allowed to lease its idled resource to the nearby MCEUs on the condition that the MCEUs are willing to pay for the resource usage. The cost of the transaction between the MCEUs and the FBS is expressed as the proportional throughput relationship between the users. A Lagrange based binary integer programming algorithm is proposed. An MCEU first chooses the subchannels that can provide it with the highest throughput improvement in one of the FBSs. Then optimal power allocation is performed to satisfy the guarantee throughput of each MCEU. The simulation results validate that our proposal can effectively allocate power and channel resource to the MCEUs and achieve improved throughput compared to the case when the MCEUs are served by a macro base station （MBS）. In addition, the fairness among these MCEUs based on their

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throughput requirement in each FBS is satisfied.

国際会議

4 Nam Hoai Nguyen, Takuro Sato, “A Proposal for Dynamic WLAN Selection for Mobile Data Offloading in Heterogeneous Net-

work”, IEEE VTC 2014 Spring, May 2014, Seoul, Korea.

【要約】In this paper, we present a new Wi-Fi roaming selection scheme as a solution for macro-cell traffic offloading. The idea is to take advantage of the Access Network Discovery and Selection Function （ANDSF） policies and the IEEE 802.11k standard for Wi-Fi access point （AP） selecting process. Although ANDSF can provide the list of candidate APs with preferred selection policies, due to the fact that ANDSF’s selection policies are static and are not based on the real-time network condition, it cannot be considered as a solution for traffic steering and offloading issue in heterogeneous network. In our proposed scheme for Wi-Fi offloading, we ad-dress this issue by taking into account the real-time traffic load of Wi-Fi AP as one criterion for selection. We simulate and verify the proposed scheme on NCTUNS 6.0. The simulation result shows that our scheme can effectively offload the data traffic from cellular.

5 Keping Yu, Zhenyu Zhou and Takuro Sato, “Cloud-based Modified Residential Energy Management Algorithm in Smart Grid Network”,

International Conference on Modeling and Simulation Technology, JSST-2013, September 2013, Tokyo, Japan.

【要約】In Smart grid, it enables two-way communication between the consumers and utilities by using the smart meters, where energy management becomes possible for both sides. Smart meters provide time-related consumption information which is used in Time Of Use （TOU） pricing to enable flexible billing. According to TOU, rates differ in peak, moderate peak and off peak hours. Druing peak hours, consumers are charged more because utilities bring peak plants online which will use more expensive resources. Hence consumers are encouraged to shift their demands to off peak hours to decrease their energy bills and carbon dioxide （CO2） emis-sion. Based on the traditional residential energy management （REM） scheme, shifted demands always stay in the nearest off peak hours, which will increase the network load due to the rapidly increasing demands and may cause the new peak period. In this paper, we proposed a modified residential energy management algorithm to solve above mentioned problem. Otherwise we tried to put this algorithm into the security and mature cloud-based enviroment to improve the large datas processing capacity and conpared with diffenrent residential energy management architectures. Finally we use MATLAB to simulate it, the result demonstrated our algorithm is efficient to reduce consumers’ bills and prevent network load increase.

6 Yanwei Li, Zhenyu Zhou, Nam Nguyen, and Takuro Sato, “Game Theory based Hybrid Access for Macrocell-edge Users in a Macro-Femto Network”,

IEEE VTC 2013 spring, June 2013, Dresden.

【要約】The extensive deployment of femtocells introduces co-channel interference to the macro cell-edge users （MCEUs）, which de-grades the throughput improvement of the total network. In this paper, we consider the scenario in which the femtocell base station （FBS） allows the hybrid access of MCEUs on the condition that the MCEUs rent the power resource from it. However, the FBS is power limited. If almost all of its power is used to serve the MCEUs and its original femtocell users （FUEs）, when newly authoritized FUEs are switched on, there will be little power left to serve these newly authoritized FUEs. In this situation, the FBS can select one MCEU as a relay to coordinate its information transmission to the FUE. To reward the cooperation of the MCEUs, the FBS will agree to support the service of MCEUs without charging. Stackelberg game is used to find the optimal power and price value for this procedure. An MCEU relay selection criterion is proposed for the FBS. The optimal power that the MCEU can obtain from the FBS and the power that the MCEU can obtain from the FBS and the power that the MCEU can share with the FUEs are obtained. The simulation results show that the throughputs of both the FUEs and the MCEUs are improved.

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国内論文

7 Battulga Davaasambuu and Takuro Sato, “Performance Analysis of Packet scheduling schemes for Mobile Base staion in LTE netwroks”,

IEIEC conference, March 2014, Niigata.

【要約】The real time data is increasing in recent years. Such as, the online gaming, video streaming and multimedia data. The LTE should be able to achieve a high data rate to support multimedia applications over wireless networks for anytime and anywhere access. Multimedia communications that demand both highthroughput and continuous connections. In this paper, We present provides performance comparisons of scheduling schemes such as Proportional-Fair （PF）, Modified Largest Weighted Delay First （ML-WDF）, Exponential Rule, Exponential/PF （EXP/PF） on QoS provisioning in the high speed train network and cell list based handoff scenario with moving base station. One major challenge of such a system is to design an scheduler that provide quality of service （QoS） to users under mobility scenarios. Simulation and results show that scheduling schemes on video stream transmis-sion in LTE network. Index Terms –Packet scheduling scheme, real-time traffic, LTE

8 Zheng Wen and Takuro Sato, “CCN Based Disaster Information Service”,

IEICE paper, March 2014, Niigata.

【要約】Thecontent-centric networking （CCN） has changed the method of network service design. As the next generation network, the CCN provides significant advantages over previous networking. Nowadays, most webservers still work in terms of client to server （C/S） architecture.When a large scale disaster happens, the C/S architecture will become unstable. In this paper, we proposed a disaster information sharing method based on CCN, Content-orientednetwork service. The terminals could share and gain infor-mation fromthe CCN routers without webservers. The exchange of information is between the routers and mobile terminals. Even if the connection between CCN routers and Webservers is disconnected, our system may still provide disaster information service for terminals.

9 Khin Ohn Mar and Takuro Sato, “Power Reduction Network of Cell Terminal using Tethering”,

IEICE paper, March 2014, Niigata.

【要約】Nowadays, users may rely on Wi-Fi networks to receive broadband services anytime and anywhere in various environments. The trend of the mobile communication is changing rapidly and unpredictably day by day. Power consumption has been a real challenge for Hardware and Software designers as well as users. The study detailed in this paper represents how much transmitted power is reduced by using tethering. Compared scenarios with the use of tethering and without one are explained.

10 Zhao Zhengge and Takuro Sato, “CCN Based Proactive Caching Scheme for VoD Service”,

IEICE conference, March 2014, Niigata.

【要約】VOD の同時ユーザーアクセス数の増加により，サーバーの通信容量が不足する．本稿では，CCN を利用して，VOD サービスを効率化した結果について報告する.

11 Zheng Wen, Li Zhu, Zhengge Zhao, Chao Wu, Yang Shen, Na Yu and Takuro Sato, “CCN Based Disaster Information Sharing System”, 2, IEICE technical conference RCS, March 2014, Waseda University, Tokyo.

【要約】Content-Centric Networking （CCN） as one of the Next Generation Network （NGN） technologies provides merits in terms of mobility, security, power consumption and bandwidth efficiency. However, most of network services depend on client-server mode. When a large scale disaster strikes, the connections between clients and servers might be unstable, because of the dam-ages, congestions, and power failure of the network systems. The network service could not maximize the efficiency of CCN if it

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over-dependence on central server. Therefore, the content-oriented and decentralized network service could improve the survivabil-ity and efficiency in disaster. In this paper, we proposed a decentralized CCN based network service to provide disaster information service between terminals and CCN nodes.

12 Wu Chao, Zhao Zhengge, Wen Zheng, Zhu Li, Shen Yang, Yu Na, Takuro Sato, “PCC: Against Cache Pollution in CCN”, 2014年電子情報通信学会総合大会, March 2014, 新潟大学　五十嵐キャンパス.

【要約】The content-centric network （CCN） provides a new solution to what future network would be like. By caching named data on routers, CCN intends to realize higher speed and energy efficiency in Internet. In this paper, we propose an against-attack caching strategy̶popularity comparing caching （PCC）. The basic design concept is based on analysis of contents’ popularity. Simulation shows that PCC achieves higher hit ratio than LCE when there is no attack, and outperforms LCD and LCE under attack.

13 Wu Chao, Zhao Zhengge, Wen Zheng, Zhu Li, Takuro Sato, “Evaluation of PCC in CCN MANET”, 電子情報通信学会　無線通信システム（RCS） 研究会, March 2014, 早稲田大学.

【要約】Content Centric Network （CCN） intends to meet the rapid growth of data delivery demand. The mobile application of CCN poses a hot topic, and Mobile Ad-hoc Network （MANET）, which plays a crucial role in information propagation in post-disaster rescue, combat missions and infrastructure-less applied with CCN is suggested to be more efficient. However, situation in the mobile case is different as that of wired. In this paper, we focus on the cache characteristics of mobile CCN device. We propose a novel caching decision policy --Popularity Compare caching （PCC）. Simulation show on limited memory mobile devices, PCC outperforms LCE, and achieves higher hit ratio outperforms LCD and LCE under cache attack.

14 Arifuzzaman Mohammad, Yu Keping, Takuro Sato, “Economic Incentives for major network players in Information Centric Networking: A Game The-

oretic Analysis in Game Theoretie Approach”, IEICE RCS, 145-150, March 2014, Waseda University.

【要約】By the nature of the design architecture of Information Centric Networking （ICN）, it is evident that the benefits of ICN are mostly reliant on the extensive cache structure. It is true that without some explicit monetary gain the network player will not be motivated to provide this widespread cache structure for accommodating totally new internet architecture. In this paper, we clarity the economic gain of major network players in Information Centric Networking （ICN）. We assumed a realistic contend distribution model for ICN and by applying game theory, we formulate an incentive sharing mechanism among the major network players involved in the contend distribution. We also analyze the possible economic gain for the network player for Live Streaming Media broadcast in ICN architecture.

15 佐藤 拓朗, 朴 容震, 津田 俊隆, 後藤 滋樹, 田中 良明, 亀山 渉, 嶋本 薫, 甲藤 二郎, 市野 将嗣, “交通機関を活用したコンテンツ配信システムの開発”,

IEICE　全国大会, March 2014, 新潟大学.

【要約】モバイルトラヒックの爆発的な増加に対応するために，列車に代表される交通機関を通信プラットフォーム化し，新世代ネットワーク技術として注目を集めるCCN（Content Centric Networking）［1］ をコンテンツ配信に活用する．具体例として，モビリティを活用したコンテンツ先回り配信と，輻輳地域（災害地域）トラヒックを非輻輳地域に配送するオフローディングの検討を進める．

16 沈 揚, 佐藤 拓朗, “CCNにおける電気自動車を活用した最適移動情報通信”,

IEICE　全国大会, March 2014, 新潟大学.

【要約】Van Jacobsenが提案したContent-centric Network（CCN）はIPアドレスではなく，コンテンツの名前（ID）を用いて

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通信する技術．中継ノードがコンテンツをキャッシュー保存することにより，端末間でのend-to-endとの通信が不要となる．特に災害時，ネットワークが切断された場合においても災害エリアの情報が確保され，耐災害性能の強い手法であると考えられる．また，災害発生することによる電力供給が途絶えた場合，非常用電源として電気自動車（以降，EVと略称する）を活用し，災害状況に応じて，移動手段（中継ノード）として最適位置移動することによる災害情報発信機能を活かすことが期待できる．

17 Kovi Aduayom Ahego, Takuro Sato, “Technical Environments required for using WSNs in Smart Grid”,

IEICE conference, March 2014, Niigata.

【要約】The increase research and implementation of wireless sensor network in recent communication systems have gained tremendous consideration. WSNs are recognized for their lowcost, energy consumption features that enable their high utility in communication network. WSNs are suitable for utility monitoring and controlling of the equipment in the smart grid. However their deployment faces many challenges in data transmission between the applications devices since it requires efficient and reliable operation moni-toring for a robust smart grid systems. This paper presents the promising aspect of using WSNs in smart grid and proposes the technical environments required for better performance of application of WSNs in smart grid.

嶋本 薫　教授SHIMAMOTO, Shigeru　Professor

学会論文誌

1 Chunxiao Li, Weijia Chen, Dawei He, Xuelong Hu, and Shigeru Shimamoto,“A Travel-Efficient Driving Assistance Scheme in VANETs by Providing Recommended Speed”,

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E96-A, No. 10, pp. 2007-2015, Oct. 2013.

【要約】Vehicles’ speed is one of the key factors in vehicle travel efficiency, as speed is related to vehicle travel time, travel safety, fuel consumption, and exhaust gas emissions （e.g., CO2 emissions）. Therefore, to improve the travel efficiency, a recommended speed calculation scheme is proposed to assist driving in Vehicle Ad hoc networks （VANETs） circumstances. In the proposed scheme, vehicles’ current speed and space headway are obtained by Vehicle-to-Roadside unit （V2R） communication and Vehicle-to-Ve-hicle （V2V） communication. Based on the vehicles’ current speed and adjacent vehicles’ space headway, a recommended speed is calculated by on-board units installed in the vehicles, and then this recommended speed is provided to drivers. The drivers can change their speed to the recommended speed. At the recommended speed, vehicle travel efficiency can be improved: vehicles can arrive at destinations in a shorter travel time with fewer stop times, lower fuel consumption, and less CO2 emission. In particular, when approaching intersections, vehicles can pass through the intersections with less red light waiting time and a higher non-stop passing rate.

国際学会

2 Thomas Bourgeois and Shigeru Shimamoto, “Stochastic Analysis of Handshake-type Mechanisms in Uniformly Random Wireless Ad Hoc

Networks”, Proc. 2013 IEEE Global Communications Conference （GLOBECOM 2013）, pp. 158-163, Atlanta, USA, 9-13 Dec. 2013

【要約】In this paper, we determine accurate expressions for the probability of success of handshake-type network mechanisms in a wire-less ad hoc network modelled by a Poisson point process. Handshake-type mechanisms form the basis for the implementation of

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