Resource Allocation for Quality of Service Provision in Buffered Crossbar Switches with Traffic Aggregation

Q. Duan (USA)


Buffered crossbar switch, quality of service, resource allo cation, traffic aggregation.


The capability of providing quality of service (QoS) in packet switches of computer networks is critical to imple mentation of distributed multimedia systems. The buffered crossbar switching architecture is promising to achieve high performance without complex implementation. In this paper, we study the problem of resource allocation to ag gregated traffic classes in buffered crossbar switches for QoS provision. We develop techniques for determining the required amount of bandwidth and buffer space for aggre gated traffic classes to provide delay performance guaran tee, and analyze the impact of traffic aggregation on re source utilization in buffered crossbar switches. We con sider two traffic aggregation cases: aggregation of a set of flows with identical traffic profiles, and aggregation of a set of flows with different traffic parameters. For both cases, we compare the amount of resources required by the ag gregated class and by the set of individual flows for guar anteeing identical delay objectives. We find that traffic ag gregation reduces both bandwidth and buffer space require ments, and the amount of resources saved by aggregation is associated with multiple factors, including the delay objec tive, the arrival traffic parameters, and the number of flows aggregated into one class.

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