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Interworking between Ad hoc Network and Supporting Network

INFOTECH Seminar Advanced Communication Services SS 2003. Interworking between Ad hoc Network and Supporting Network. July 11, 2003 Napat Nantavechsanti Mentor : Dr.Stephan Rupp. Agenda. 1 : Wireless Networks 2 : Mobile Ad hoc Network: Basic concept 3 : Multihop Cellular Network

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Interworking between Ad hoc Network and Supporting Network

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  1. INFOTECH Seminar Advanced Communication Services SS 2003 Interworking between Ad hoc Network and Supporting Network July 11, 2003 Napat Nantavechsanti Mentor : Dr.Stephan Rupp

  2. Agenda • 1 : Wireless Networks • 2 : Mobile Ad hoc Network: Basic concept • 3 : Multihop Cellular Network • 4 : Hierachical Cellular Multihop Network (HCMN) • 5 : Conclusion

  3. Questions • Why do we need many different types of networks? Why don‘t we integrate them together and make use of this integrated system? • How can Ad Hoc relaying concepts improve the efficiency of the existing Cellular Networks?

  4. WLAN : Based on ethernet backbone • Uses radio, infrared and microwave to transmit data without cable • Consists of nodes and access points • Provides good mobility but small coverage area

  5. GSM : Single-hop cellular based on infrastructure architecture

  6. Third-Generation Mobile Systems • Same concept as GSM but provides higher data rate, high speed access and support broadband services • Optimized for data transmission

  7. Questions • Why do we need many different types of networks? Why don‘t we integrate them together and make use of this integrated system? • How can ad hoc relaying concepts improve the efficiency of the existing cellular networks?

  8. Mobile Ad hoc Network (MANET) • Infrastructureless architecture • Nodes are free to move then network’s structure is changed dynamically because of members’ mobility • The responsibility of direct communication determination is determined by each node (self organizing and adaptive) • Multihop wireless network

  9. Mobile Ad hoc Network (cont.)

  10. Multihop Cellular Network (MCN) • Combination of the features of SCN and ad hoc cellular network • Feasible architecture for WLANs • Mobile stations relay packets by relaying traffic from congested cells to neighbor cell which have free bandwidth • 3 systems using multihop concept: • iCAR (Integrated of Cellular and Ad hoc Relaying) • A-GSM (Ad hoc GSM) • HCMN (Hierarchical Cellular Multihop Network)

  11. ARS (Ad-hoc Relaying Stations) is placed at necessary location to be used to relay signals between MH and BS Each ARS and MH must have two interfaces; C interface for communicating with the BTS R interface for communicating with another ARS ARS MH Basic Idea of iCAR

  12. x A B A B x (a) (b) ARS Mobile Host Example of relaying • MH X moving into congested Cell B is relayed to Cell A

  13. Extends the standard GSM radio interface with the capability to support relaying Make use of the existing GSM architecture with minimal changes to support rapidly deployable network requirements A-GSM network entities Base station subsystems Mobile switching centers Network databases: HLR, VLR, AC and EIR Internetworking units Integrated dual mode terminal Ad hoc GSM (A-GSM)

  14. Ad hoc GSM (cont.)

  15. Hierarchical Cellular Multihop Network (HCMN) • Integration of different types of wireless networks, organized in layered structure • HCMN here will be considered as the integration of WLAN and cellular network

  16. Hierarchical Cellular Multihop Network (cont.) AP: Access Point MHN: Mobile Capable Node MN: Mobile Node

  17. Hierarchical Cellular Multihop Network with Fixed MHNs • Fixed MHN or so called „Extension Point (EP)“ • Situlates at the location where yield the highest benefit • Used to extend the coverage of the AP

  18. Hierarchical Cellular Multihop Network with Mobile MHN • Mobile MHN • Used when fixed MHN cannot provide required throughput of the users. • Routing algorithm becomes an important issue

  19. Conclusion • Why do we need ad hoc cellular communication? • Increasing of subscribers including service needs • Insufficient resources in hot spot area • Useful when infrastructure not available, impractical, or expensive • Enhance the efficiency of the system in term of coverage area and balanced load of the system by using ad hoc concept • Some critical issues that should be considered • Security • Level of modification and implementation complexity and cost • Power control, etc. • Status: multihop communication is not yet deployed. IETF is working on the MANET standards.

  20. ...Thank you very much for your attention... Questions

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