コンピュータ ネットワークシステムトラック Anh T. Pham 上級准教授 コンピュータ通信学講座 www.u-aizu.ac.jp/labs/hw-cc/ 6/17/2011 CCL Introduction - 2011
Roadmap コンピュータ通信学講座: Introduction インターネットと通信システムに関する研究: What & Why? 研究のテーマ マルチメディアネットワーキング 光ファイバネットワーク 光無線ネットワーク Other ネットワーキングテーマ 関連する教科 & Prerequisites 6/17/2011 CCL Introduction - 2011
コンピュータ通信学講座 Introduction 6/17/2011 CCL Introduction - 2011
コンピュータ通信学講座 Video/image/voice streaming アプリケーション層 Multimedia search engine Truong C. Thang 准教授 （チヨオン・コン・タン） トランスポート層 Multimedia Protocols モノの インターネット ネットワーク層 光ファイバ通信 物理とデータリンク層 光空間通信 Anh T. Pham 上級准教授 （アン・トウアン・ファん） Lab website: www.u-aizu.ac.jp/labs/hw-cc/ 6/17/2011 CCL Introduction - 2011
インターネットと通信システムに関する研究: What & Why? 6/17/2011 CCL Introduction - 2011
情報 化社会 - We are living in the Information society, where Information plays an increasingly role in our daily life We create, use and exchanging information everyday with help of our computing devices, such as PC, laptops and smart phones Have you ever think about what the Information is and how it is different from things? 6/17/2011 CCL Introduction - 2011
情報 vs. 物 情報: Can be replicated 物: You lose it when you give it away 6/17/2011 CCL Introduction - 2011
What You Can Do with a Computer? is not good at spreading 情報 Create/use 情報 Modify/process 情報 Store情報 6/17/2011 CCL Introduction - 2011
Computer Network can help us to share/spread 情報 コンピュータ ネットワークシステム Computer Network can help us to share/spread 情報 without limit of capacity, distance (everywhere); it is convenience and low-cost. 6/17/2011 CCL Introduction - 2011
What actually makes the Internet Work? 6/17/2011 CCL Introduction - 2011
This is what you basically do not see Japan Post Service This is what you can see mail mail YOU アプリケーション層 Okinawa ken, Naha-shi Mr. Suzuki Okinawa ken, Naha-shi Mr. Suzuki トランスポート層 This is what you basically do not see ネットワーク層 Postal service Okinawa Postal office in Aizu Postal office in Tokyo Postal office in Okinawa Okinawa Okinawa Okinawa 6/17/2011 CCL Introduction - 2011
What Really Happen There? 会津 郡山 大阪 沖縄 新潟 東京 How to pack things ? Which way? Which mean? Car/train/bike/plane… How to build a good, efficient system? What is the next good way? 6/17/2011 CCL Introduction - 2011
研究のテーマ マルチメディアネットワーキング 光ファイバネットワーク 光無線ネットワーク モノのインターネット 6/17/2011 CCL Introduction - 2011
マルチメディアネットワーキング Example applications HTTP Streaming: Youtube, AppleTV RTP Streaming: IPTV, Hikari-TV Media Broadcasting: Mobile TV Media Searching: Google with image/video 6/17/2011 CCL Introduction - 2011
Open Questions How to send multimedia data? When to send? Packetization, encapsulation, Unicast/multicast protocols When to send? Time stamp Event information (context) What to send? How to make content/media intelligent? Media transcoding and scalable-media processing How to make decisions? Signaling metadata for context Server-based, client-based 6/17/2011 CCL Introduction - 2011
光アクセスネットワーク コアネットワーク アクセスネットワーク コミュニケーションネットワーク Provider 1 (NTT) (KDD) Provider 1 (NTT) Provider 3 (YahooBB) コアネットワーク コミュニケーションネットワーク 6/17/2011 CCL Introduction - 2011
光アクセスネットワーク 光ファイバ通信とは Radio comm. systems Telco systems (wire) Broadcasting System (cable) Metallic cable PSTN/xDSL Coaxial (HFC) PBX LAN 光ファイバ We are working for achieving an efficiently & fairly光アクセスネットワーク 光ファイバ通信とは 電気通信 光通信 大容量・低損失 Few km Up to 100 km 6/17/2011 CCL Introduction - 2011
アクセスネットワークTechnologies What’s Next? FTTX (PON) FWA xDSL The information network was actually born about more than hundred year ago when Abraham Bell invented the Telephone in 18xx ???. Since then, the core NW has been aggressively developed with many advanced technologies, From analog tech to fully digital and computer-controlled technology. From Manual SW to Circuit SW and Packet SW. However, only a little change happen to the AN. Just few year ago, or even now, many of us are still using the copper cable to connect to a telephone, which is almost the same as the one Bell invented 100 year ago. There has been almost no development in the area of access NW until 1990s. Since, 1990s, there has been an aggressive development in the area of the access NW. We can see here the development of access method to the internet. In early 1990, the most popular method is dial-up via the same copper cable with the telephone. Hybrid fiber optic and coaxial cable appeared and became popular in mid 1990s. HFC can provide broadband access for computer user. However, it was expensive and was not widely used, even in Japan. The reason of its expensiveness is that new infrastructure is required, new cable must be used for this service. xDSL appears in the market during the end of 1990s and quickly became popular. And ADSL is the most popular. ADSL can provide broadband service on the same infrastructure with the PSTN so that implementation can be very cheap and quick. Recently, due to the demand of even higher speed, and most importantly thanks to the PON technology, access network based on optical fiber become popular recently. You can see in this figure the broadband connection penetration in several countries and distribution of technique in Japan We are going to discuss the three most popular technologies of dial-up, ADSL and PON in this presentation. HFC (Cable) Dial-up Internet Telephone Early 1990s Mid-1990 End 1990s 2000s 6/17/2011 CCL Introduction - 2011
光符号分割多元接続 (OCDM) 多重 符号器－１ 復号器－１ 結合器 符号器－２ 符号器－N 復号器－２ 復号器－N 拡散符号－１： 「0100010000001」 拡散符号－２： 「0010001000100」 拡散符号－N： 「1001000000010」 6/17/2011 CCL Introduction - 2011
Future OCDM-based 光アクセスネットワーク 6/17/2011 CCL Introduction - 2011
光無線ホーム・ホームアクセスネットワーク remote, low density area super-high density area, or area where it is not favorable to lay cable Central office 光ファイバ OWAP ビル 光無線 OWAP： 光無線アクセスポイント ホーム transceiver 光無線ホームアクセスネットワーク 光ファイバ ルータ 光無線 Indoor OWAP 光無線ホームネットワーク 6/17/2011 CCL Introduction - 2011
Survivable/Cooperative Town-based Network Key technologies: Resilience network model Protocol/data conversion for cooperative relay communications Light-weight, energy-efficient protocols for emergency purpose To neighbor communities Local rescue HQ broken Town Net B GW No connection to the world broken Isolated house with victims broken TV Sofa to HQ Rescue team Evacuation site Isolated house with victims TV Maintaining vital communications for local community: send updated status, receive updated data/instruction; remote support/ surveillance from local HQ Rescue works: locating victims, people need supports Victims Sofa 6/17/2011 CCL Introduction - 2011
関連する教科 & Prerequisites 6/17/2011 CCL Introduction - 2011
コンピュータネットワーク 関連科目一覧 通信ネットワークⅠ: Basic 通信ネットワークⅡ: Advanced ディジタル通信システム: Specialized 性能解析論: Specialized 1) What is CN. 2) Why CN track are necessary. 3) What kinds of courses will be learnt from CN, why those courses. 4) What kind of jobs will need CN knowledges. 6/17/2011 CCL Introduction - 2011
Prerequisites & Working Plan Motivate to study Mathematics background Good at (at least) one programming language (C/Matlab/Mathematica) Working Plan First stage: training (weekly meeting) Second stage: brainstorming (bi-weekly meeting, or anytime if you have an idea) Read papers Consult the advisor and decide your theme Third stage: work on your project (bi-weekly) Computer simulation, check analytical result Complete your paper 6/17/2011 CCL Introduction - 2011
What actually do we do ? Propose new techniques to improve system performance Study current systems Create mathematical analytical model Computer simulation & confirm the result Expected result ? Publish the outcome Re-design: proposed new method, add new components etc. 6/17/2011 CCL Introduction - 2011
Optical System Evaluation using Matlab 6/17/2011 CCL Introduction - 2011
Optical System Simulation using OptiSystem 6/17/2011 CCL Introduction - 2011
Network Simulation using Opnet 6/17/2011 CCL Introduction - 2011
Thank you for your attention ! We look forward to welcome you at CCL 6/17/2011 CCL Introduction - 2011