Abstract
This study investigates the problem of enabling Quality of Service (QoS) of multimedia traffic at the input port of high-performance input-queued packet switches using a simulation-based evaluation. We focus on the possibility of assuring QoS of multimedia traffic in such switches by implementing traffic prioritization at the input port where each input-queue has been modified to provide a separate buffer for each of the service classes. The multimedia traffic can be categorized into three classes based on its real-time properties and loss tolerance and assigned a separate queue for each class. We select appropriate models for each of three types of traffic: video, voice and data. Then, we propose an efficient dynamic scheduling strategy by implementing multimedia traffic prioritization at the input port of input-queued packet switches. Simulation-based comparisons show that while the static priority scheme is beneficial for highest priority class at the expense of the others, the dynamic prioritization serves fairly well all the classes in terms of delay and loss requirements.
Highlights
Advanced networking technologies have enabled the integration of multimedia transmissions, such as video, voice and data, in packet-switched networks
The multimedia traffic can be divided into two distinct types: real time, e.g., live audio and video packets and non-real time, e.g., file transfer packets
Input-Queued (IQ) switches with virtual output queuing (VOQ) based buffering schemes are often adopted as architectures of choice for high-speed switches or routers (Fig. 1)
Summary
Advanced networking technologies have enabled the integration of multimedia transmissions, such as video, voice and data, in packet-switched networks. Real-time packets are loss-insensitive but delay sensitive This means that packets of this type should be served so rapidly by the switch scheduler that they get to their destination in the shortest time possible, even if some of them are lost. The need to queue these packets remains since all of the packets cannot be transmitted across the transmission line at the same time This is so-called line-contention problem and corresponding generic type of packet switches are called output-queued packet switches[2,3,4]. Another way is to queue newly arrived packets at the input ports and to transfer them across switching fabric when appropriate capacities are available.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
