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While it is not a problem to implement large buffers in crosspoints nowadays, crosspoint queued (CQ) switch architecture has been recently implemented, which is a special buffered crossbar with large crosspoint buffers and no input queues. Under unicast traffic conditions, CQ nearly behaves as an ideal output-queued switch while the buffer size increases. Multicast is much more sophisticated that...
Mobile WiMAX's scheduling service is a key factor in Radio Resource Management (RRM) in realizing Quality of Service (QoS). The choice in scheduling algorithm for Mobile WiMAX base stations, albeit outside of the scope of the standard, critically impacts the performance and robustness of Mobile WiMAX networks. This paper provides an in-depth study of four major scheduling algorithms: Round Robin (RR),...
In this paper, we address the problem of maximizing sensor networks lifetime as well as maintain sufficient sensing coverage. The problem of computing redundant sensing areas among neighboring heterogeneous sensors is analyzed. We present a mathematical model to compute the redundancy degree of each sensor without the knowledge of location information for heterogeneous wireless sensor networks. Based...
It is known that single-stage IQ based switch can provide 100% throughput guarantee for any admissible unicast traffic pattern. However, due to particular characteristics of multicast traffic, the performance of IQ switches in the case of general multicast traffic patterns is inferior to its performance in the case of unicast traffic, which motives us to find new architectures to provide better performance...
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