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System Architecture for C2C Communications Based on Mobile WiMAX Michiyo ASHIDA VTT Technical Research Centre of Finland

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Presentation on theme: "System Architecture for C2C Communications Based on Mobile WiMAX Michiyo ASHIDA VTT Technical Research Centre of Finland"— Presentation transcript:

1 System Architecture for C2C Communications Based on Mobile WiMAX Michiyo ASHIDA VTT Technical Research Centre of Finland michiyo.ashida@vtt.fi

2 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 2MCO'08, Metz, France/Luxembourg9.9.2008 OUTLINE  Background  Two types of Mobile WiMAX architecture  C2C communication difficulty with Mobile WiMAX  New architecture for C2C communication based on Mobile WiMAX  Conclusion & future work

3 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 3MCO'08, Metz, France/Luxembourg9.9.2008 BACKGROUND

4 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 4MCO'08, Metz, France/Luxembourg9.9.2008 NEEDS FOR A CITY-WIDE WIRELESS NETWORK FOR VEHICLES For vehicular services, such as localized weather & traffic services Requirements:  Wireless broadband connection Between car and base station, 1km Car-to-infrastructure (C2I) communication Directly with neighbors Car-to-car (C2C) communication  Real-time data delivery  User mobility improvement (60-100km/h)

5 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 5MCO'08, Metz, France/Luxembourg9.9.2008 URBAN WLAN NETWORK EXAMPLE - panOULU Provided for free by City of Oulu, Finland Currently IEEE 802.11 b/g (WLAN) Some mesh routers More than 1000 access points High throughput for stationary users ”Spot” type coverage Not meant for nomadic and mobile users http://www.panoulu.net/index.shtml.en

6 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 6MCO'08, Metz, France/Luxembourg9.9.2008 CITY-WIDE MOBILE WiMAX NETWORK FOR HIGH-SPEED VEHICLES IEEE802.16e-2005 standard Broadband wireless metropolitan area networks for fixed and mobile nodes Advantages: Provides connection in a “wide-area”, not “spot” Intelligent MAC  Scheduling  Quality-of-Service (QoS) support  Large BS capacity Mobility management  Fast and seamless handover  Power management Security support  Protection of both control & data messages Support for smart antenna technologies

7 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 7MCO'08, Metz, France/Luxembourg9.9.2008 REQUIREMENTS (RECAP)  Wireless broadband connection Between car and base station, 1km Car-to-infrastructure (C2I) communication Directly with neighbors Car-to-car (C2C) communication  Real-time data delivery  User mobility improvement (60-100km/h)

8 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 8MCO'08, Metz, France/Luxembourg9.9.2008 TWO TYPES OF MOBILE WiMAX ARCHITECTURE

9 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 9MCO'08, Metz, France/Luxembourg9.9.2008 MOBILE WiMAX - TWO TYPES OF NETWORK ARCHITECTURE Point-to-MultiPoint (PMP) Mode, Default Mesh Mode, Optional Central control by BS Node authentication Transmission scheduling Handover support Data encryption Crypto. key management One-hop communicationMulti-hop communication Traditional C2C approaches: Mesh/ad-hoc networking

10 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 10MCO'08, Metz, France/Luxembourg9.9.2008 WHY NOT MESH? Coverage issue is not so important with Mobile WiMAX Problems with mesh: Less performance than single-hop Complex management of moving node in real-time Large amount of management traffic due to routing Compatibility issue (a single routing protocol) Unreliable connection depending on topology No WiMAX mesh products available yet 1000 packets 85% Successful delivery rate = 85% 614 packets xx=61.4% End-to-end delay = D p1 D p2 D p3 D h1 ++++

11 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 11MCO'08, Metz, France/Luxembourg9.9.2008 TRANSMISSION SCHEDULING - TIME DIVISION DUPLEX (TDD) Duplexing is a technique to control use of shared resource (e.g. channel) Time intervals for downlink and uplink Collidions can be avoided by duplexing Frequency Time Downlink Uplink Channel f 1 Transmissions from BS Transmissions from Mobile Nodes (shared)

12 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 12MCO'08, Metz, France/Luxembourg9.9.2008 C2C MODULE BASED ON PMP MODE

13 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 13MCO'08, Metz, France/Luxembourg9.9.2008 FINDINGS FROM PMP MODE BS SourceDestination 12 Problem: Always routed through BS Requires two times of transmissions Addressing problem ? Radio is broadcast Neighbors can listen However, no direct communication is available Reason: lack of neighbor knowledge and routing decision module

14 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 14MCO'08, Metz, France/Luxembourg9.9.2008 TRADITIONAL NEIGHBOR DETECTION ALGORITHMS HELLO based neighbor detection Handshake based neighbor detection Link-state aware neighbor detection Wireless Channel HELLO ACK Node BNode A Oh, Node B is my neighbor! REQ OK, Node A is my neighbor! PROBE Channel condition seems to be good!

15 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 15MCO'08, Metz, France/Luxembourg9.9.2008 SYSTEM ARCHITECTURE FOR OPTIMIZED C2C COMMUNICATION BASED ON TDD Default 2-hop connection to BS is always available Optimized C2C only if available Node finds its neighbors by incoming packets from them  Phy information  Channel quality No increase of traffic  Uses existing packets Message exchange with BS (or others) Data

16 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 16MCO'08, Metz, France/Luxembourg9.9.2008 WHAT IT SOLVES?

17 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 17MCO'08, Metz, France/Luxembourg9.9.2008 WHAT OPTIMIZED C2C APPROACH SOLVES Enables C2I & C2C communication for high-speed vehicles in a large area Dramatically reduces data traffic (up to 50%, compared to traditional PMP) Localized broadcast may be possible

18 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 18MCO'08, Metz, France/Luxembourg9.9.2008 WHAT ARE THE ADVANTAGES OF USING OPTIMIZED C2C APPROACH? Flexible & reliable routing Routing is optimized Default connection is always maintained Increases network performance Shorter delivery time, less packet loss Conserves bandwidth, speeds up downlink No extra packets due to routing Compatible with standard PMP mode Node management & scheduling by BS No complex routing

19 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 19MCO'08, Metz, France/Luxembourg9.9.2008 FUTURE WORK & CONCLUSION

20 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 20MCO'08, Metz, France/Luxembourg9.9.2008 FUTURE WORK & CONCLUSION Future work (performance analysis, security consideration) Problem: Needs for both C2I & C2C in a wide area, for the needs to detect and report incidents anywhere in a city Costly traditional C2C approaches Proposal of system architecture: Optimized C2C for Mobile WiMAX Benefits: Flexible and reliable routing, efficient neighbor detection Improves network performance Compatible with standard PMP mode

21 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 21MCO'08, Metz, France/Luxembourg9.9.2008 THANK YOU! For more information: Michiyo ASHIDA (michiyo.ashida@vtt.fi)

22 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 22MCO'08, Metz, France/Luxembourg9.9.2008

23 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 23MCO'08, Metz, France/Luxembourg9.9.2008 CELLULAR & SATELLITE NETWORKS Cellular network Advantage Disadvantage Satellite network Advantage Disadvantage

24 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 24MCO'08, Metz, France/Luxembourg9.9.2008 IEEE 802.11p Amendment to IEEE 802.11 standard ”Dedicated short-range communications” for Intellegent Transport System (ITS) Between high-speed moving vehicles Between vehicle to roadside ”accesspoint” ”Spot” type coverage, not ”area” or ”city-wide” IEEE 802.11 MAC is only suitable for ”local area network” Usage of the infrastructure is restricted to ITS applications only Can be used for “spot” type ITS applications such as toll collection

25 VTT TECHNICAL RESEARCH CENTRE OF FINLAND 25MCO'08, Metz, France/Luxembourg9.9.2008 Mobile WiMAX PHY Data Rates Cite from WiMAX FORUM

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