Providing QoS guarantees in a novel switch architecture

Using buffered crossbar as a core switch fabric, we build a combined input-crosspoint-output queued switch with space-division multiplexing expansion (denoted as SDM CICOQ switch) in this paper. It is proved that an SDM CICOQ switch with an expansion factor 2 can achieve 100% throughput and exactly emulate an OQ switch. Thus, SDM CICOQ switches can provide QoS guarantees for traffic flows. For the simplicity of implementation, we also present a hierarchical priority scheduling (HPS) scheme as a reference designing for the scheduling policy of the SDM CICOQ switch. Simulation results show that the SDM CICOQ switch operating under the HPS scheduling scheme can obtain good performance.EI071257-12633