A Study Of QoS Technologies And Transmission Performance In Mobile IP

The current trend in the development of real-time Internet applications and the rapid growth of mobile communication indicate that the future Internet architecture will have to support various applications with different Quality of Service (QoS) requirements, regardless of whether they are running on fixed or mobile terminals.The current Internet architecture offers a simple service widely known as best-effort service. The best-effort service is adequate for traditional Internet applications like E-mail, web browsing or file transfer but not for the new real-time applications like IP-telephony, multimedia conferencing or audio and video streaming, which require high bandwidth, low delay and low delay jitter.In this paper, based on introduction of the basic conception of Mobile IP, we firstly emphasize the general concepts, main problems, mechanisms and approaches of QoS specification and management in Mobile IP, and then present a survey of recent developments in this field.Ongoing research on QoS has proven that its deployment on the Internet introduces complexity in its overall functionality. Therefore, finding an efficient solution for end-to-end QoS over Internet is a tough undertaking. It becomes even tougher when one is introducing QoS in an environment of mobile hosts and wireless networks.The Resource Reservation Protocol (RSVP) is a network-control protocol that enables Internet applications to obtain differing qualities of service (QoS) for their data flows. However, RSVP is designed for fixed networks and hence inadequate for mobile environment. To minimize inefficiencies in terms of QoS deterioration and misuse of the network resources, this paper proposes a RSVP extension scheme named RSVP-MA, which aims at how to reserve resources for Mobile IP networks. RSVP-MA decreases the network overhead by extending existing resource reservation routes to create new ones. We develop a discrete-event simulation model to validate the advantages of our proposal.TCP, transmission control protocol for providing reliable service, has being widely used in Internet. TCP plays an important role in guaranteeing network performances. We analyze the problems of TCP in wireless environment, present a survey of recent developments in this field, and then improve TCP throughput in Mobile IP by increasing the congestion window. We also validate the scheme by simulation.Finally, we summarize our main works and introduce our research works in the future.