Scheduling in Frame Based Packet Mode for Queued Switches

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Mrs. S. A. Ade
Prof. P. A. Tijare


Proportional fair bandwidth allocation in packet switches is a fundamental issue for quality of service (QoS) support in IP networks.
Input-queued switches performing packet-mode scheduling deliver all the segments of a packet contiguously from the input port to the output
port, thus greatly simplify the output reassembly and yield performance advantage over switches with cell-mode scheduling under certain
conditions. An important issue of packet-mode scheduling is how to achieve fair bandwidth allocation among flows with different packet sizes.
Most packet scheduling algorithms for input-queued switches operate on fixed-sized packets known as cells. In reality, communication traffic in
many systems such as Internet runs on variable-sized packets. Motivated by potential savings of segmentation and reassembly, there has been
increasing interest in scheduling variable-sized packets in a non preemptive manner known as packet-mode scheduling. The dissertation work
will study frame-based packet-mode scheduling for better scalability. The relation between the frame size and packet sizes will be derived and
the speedup will be analyzed.



Keywords: Cell-mode scheduling, frame-based scheduling, input-queued switch, packet-mode scheduling


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