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First Week Agenda First Week Agenda Course Preview Wireless Multimedia System Wireless Multimedia/Mobile Computing / Pervasive Computing Wireless Mobile Communications System Review and Fundamental

  1. First Week Agenda First Week Agenda 無線網路多媒體系統  Course Preview Wireless Multimedia System  Wireless Multimedia/Mobile Computing / Pervasive Computing  Wireless Mobile Communications  System Review and Fundamental Problems  Next Week Dr. Eric Hsiaokuag Wu hsiao@csie.ncu.edu.tw http://wmlab.csie.ncu.edu.tw/course/wms 2009 Fall Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 台灣行動電話發展趨勢圖 台灣行動電話發展趨勢圖 Course Contents Course Contents  Fundamental Wireless Technology 1800 • Propagation Model 1600 • Wireless Medium Access 1400 • Transport Solutions ers (10K) 1200 • Ad hoc/Mesh Wireless System • Cellular System 1000 Subscribe Actual Figure Actual Figure A t A t l Fi l Fi • Middleware Systems 800 Predicted in 1997 • Multimedia System 600  Advanced Wireless Technology 400 • Multicasting • Beyond 3G 200 • Routing Algorithms/Mesh Network/VANET 0 • QoS/ Reliable Mutimedia Transmissions 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Roaming Across a variety of heterogeneous network and WiMAX Nomadic and Portable WiMAX Nomadic and Portable service environments Non Line of Sight Non Line of Sight Application Line of Sight Line of Sight Point to Multi Point to Multi- -point point BACKHAUL BACKHAUL OS, MiddleWare 802.16 802.16 802.16 802.16 RTP, TCP, UDP RSVP IP, Mobile IP Wireless Network Layer Telco Core Telco Core 802.16e PC 802.16e PC Laptop Connected Clustering(optional) Network or Network or Card Card Through 802.16 Private (Fiber) Private (Fiber) Network Network Data Link SEEKS BEST SEEKS BEST MAC CONNECTION CONNECTION INTERNET INTERNET 2 to 3 Kilometers Away BACKBONE BACKBONE Radio Ref: Margaret LaBrecque , “Enabling Deployments through Standards and Certification,” 19 WiMax, 2003 Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 1

  2. Growth in traffic in different access system Growth in traffic in different access system WiMAX 802.16 WiMAX 802.16 and voice and data services and voice and data services 5 4.549 4.076 4 3.339 3.438 bps 3 2.395 M 2 1.704 1.289 1 0.855 0 2 4 2 4 2 4 3 4 _ 3 / 1 / 3 / 1 / 3 / 2 / 3 / 1 K K K _ 6 6 4 4 K S S S 1 1 6 6 S P P P M M M M P B Q Q B A A A A Q Q Q Q Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Forecast number of subscribers Forecast number of subscribers Frequency Hopping Spread Spectrum Frequency Hopping Spread Spectrum  Transmitted signal is spread over a wide range of frequencies. (i.e. 2.400- Freq. Freq. 2.485 GHz)  Transmission usually hop 35 times per second. f 7 f 6 f 5 f 4 f 3 f 2 f 1 Time Time Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Narrowband vs. Wideband Narrowband vs. Wideband Direct Sequence Spread Spectrum Direct Sequence Spread Spectrum To transmit a 0 the station use a unique To transmit a 0 the station use a unique “ chip chip sequence sequence ” : 1 1 0 1 1 0 1 0 1 1 0 1 1 1 1 1 To transmit a 1 the station use the one ’ To transmit a 1 the station use the one ’ s complement s complement 1 1 of its chip sequence: of its chip sequence: p p q q 0 1 0 0 1 0 1 0 0 1 Spread Spread Therefore if data is 1010 it will transmit: Therefore if data is 1010 it will transmit: 0 1 0 1 energy energy Bandwidth Bandwidth Bandwidth Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 2

  3. CR (Cognitive Radio) CR (Cognitive Radio) Ultra Ultra- -Wideband Radio Wideband Radio Broadband services: Cable, xDSL,Satelite,  The CR idea was initially introduced by Joseph Mitola. On average, only Terestrial Home Gateway 2% of allocated spectrum in the U.S. is actually in use Desktop computer Monitor Camcorder Printer DVD Laptop computer Digital TV Camera PDA Audio Bluetooth, Bluetooth, 802.11a GPS 802.11b PCS Emitted Cordless Phones Signal Microwave Ovens Power “Part 15 Limit” -41 dBm/Mhz UWB Spectrum 1.6 1.9 2.4 3.1 5 10.6 Frequency (Ghz) Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Multi Multi- -channel, Multi channel, Multi- -Radio, MIMO Radio, MIMO Wireless Mesh Network. Wireless Mesh Network. Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Mesh Network Scenario Mesh Network Scenario Aeronautical Communications Aeronautical Communications Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 3

  4. Wireless Applications Scenario Wireless Applications Scenario Multimedia over IP Multimedia over IP Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 3GPP 3GPP - - Release 5 IMS & HSDPA Release 5 IMS & HSDPA IMS Service Scenario IMS Service Scenario Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Context Aware Communication Context Aware Communication Business Finder Business Finder Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 4

  5. Adaptive Applications Adaptive Applications Situation- Situation -Aware Wireless Networks Aware Wireless Networks Varied type of service Video Audio Graph Text Adaptive application coding Quality High Low Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Network Mobility Management Network Mobility Management Femtocell Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 異質無線多網多媒體分享與推薦平台場景圖 IEEE 802.11 WLAN IEEE 802.11 WLAN metadata 1 搜尋 metadata 2 推薦 …. 傳送 metadata n Alice Ad hoc Infrastructu mode WiFi 人際網路 人際網路 re mode DIFS Bluetooth Data Src RTS Internet SIFS SIFS SIFS CTS Ack Dest CW WiMax Other NAV Next MPDU 搜尋 (RTS) NAV 推薦 (CTS) 傳送 Bob Defer Access Backoff after Defer Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 5

  6. Quiz 0: WLAN Performance Anomaly Problem Quiz 0: WLAN Performance Anomaly Problem Fairness for upstream and downstream Fairness for upstream and downstream 1 Mbps data rate A Mesh Node 802 11b 802.11b 11 Mbps data rate B nominal rate (Mbps) throughput (Mbps) A B A B 11 11 3.09 3.36 1 11 0.73 0.76 Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Expectation of the Class Expectation of the Class Course Process Course Process  Basic Understanding of PCS world  Paper reading and your presentations  Being able to do the wireless research  Wireless Multimedia Applications Exercises  Developing the capability to invent the key wireless applications Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Mobile phone today = multipurpose terminal for ... Mobile Computing Mobile Computing Internet Browser Information Client E-mail Client E-purse Authentication Device Share dealing, etc. Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory  Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory 6

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