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Integration of Unicast and Multicast Scheduling in Input-Queued Packet Switches with High Scalability  
Yongbo Jiang1,Zhiliang Qiu2,Jian Zhang3,Jun Li4
*1, State Key Lab of ISN, Xidian University, Xi'an, China, Email :
2, , XidiaState Key Lab of ISNn University, Xi'an, China, Email :
3, State Key Lab of ISN, Xidian University, Xi'an, China, Email :
4, State Key Lab of Science and Technology on Space Microwave Laboratory, Xi'an, China, Email :
Abstract .This paper focuses on the scalability problems for high-speed switches, and presents an integrated scheduling algorithm that supports unicast and multicast traffic efficiently in input-queued packet switches. Considering the tradeoff balancing complexity and performance, the proposed integrated algorithm performs without iteration, and reduces the scheduling overhead to O(N) with a two-phase (request-grant) sequential scheduling for unicast and multicast traffic. In addition, it can be implemented in a fully distributed way, which is more suitable for high-speed switches. Simulation results show that the proposed algorithm exhibits a good performance in terms of throughput and average delay, at different traffic compositions under various traffic patterns.
Keywords : integrated scheduling algorithm;IQ switches;multicast;scalability

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