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.
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
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
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
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.
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.
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