Buffering Requirement for Lossless Vertical handoffs in Wireless Overlay Networks

A seminar report at NCU Taiwan

Transcript

1. Buffering Requirement for Lossless Vertical Handoffs in Wireless Overlay Networks Reporter:
   
2. Outline • Abstract • Introduction • Mobile IP • System Architecture • Simulation Results • Conclusion
3. Abstract • The evolution of mobile multimedia services • In this paper • Determined the required buffer sizes to achieve lossless upward vertical handoffs. • Simulation results show that the average packet delays are within the acceptable QoS limits for most multimedia traffic types.
4. Introduction • Realize future mobile communication networks that will support integrated and multimedia services any time and anywhere with appropriate QoS. • Several WONs will coexist and there internetworking will be a challenging objective. • Handoffs are built on top of the mobile routing capabilities of Mobile IP
5. Mobile IP (1/2) • Consists of three components • Mobile Terminal • Home Agent – operate on a router or a workstation on the MT’s home subnet • Foreign Agent – operate on a router or a workstation on a foreign network where the MT is visiting • When MT moves away from its home network, it requires care-of address (CoA), which changes at each new point of attachment, from a FA. RFC 3344
6. Mobile IP (2/2)
7. System Architecture (1/4) • WONs are composed of a hierarchical structure or clusters of room-size building- size, and wide area networks. • Each of which has its own characteristics in terms of capacity, bandwidth, latency, and technology What are Wireless Overlay Networks
8. System Architecture (2/4) Wireless Overlay Networks NW3 50kbps NW2 100kbps NW1 500kbps Number of channels for NW1, NW2, NW3 are n1 , n2 and n3 respectively, where n1 ≧ n2 ≧ n3.
9. System Architecture (3/4)
10. System Architecture (4/4)
11. Simulation Results (1/5)
12. Simulation Results (2/5)
13. Simulation Results (3/5)
14. Simulation Results (4/5)
15. Simulation Results (5/5)
16. Conclusion • As expected, increasing the average load requires more buffer size. • In general, the average packet delay increases as the average load increases. • The maximum average packet delay obtained was 336ms which is within the limits of satisfying the QoS levels for multimedia communications.