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A logic function can be represented and simplified by binary decision diagrams (BDDs). This paper presents the new representation and simplification method of logic function using BDDS. Compared with logic expressions or truth tables, BDDS have unique features, such as unique concise representation, processing speed, and the memory space, etc.
Weighted fair queueing (WFQ) is a practical scheduling discipline for supporting differentiated quality-of-service (QoS) in computer networks and communication systems. Analytical models are important tools for system performance evaluation and resource optimization. However, there is not any comprehensive model reported in the open literature for analytically investigating the performance behaviors...
The provisioning of differentiated QoS is an important objective in the design and implementation of IEEE 802.16 / WiMAX-based broadband wireless networks. To this end, the hybrid scheduling mechanism that combines various fundamental scheduling principles, e.g., priority queueing (PQ), earliest deadline first (EDF), weight fair queue (WFQ), and round robin(RR) within a hierarchical structure for...
This paper presents an original analytical model for a finite buffer queueing system with active queue management (AQM) where the dynamic channel conditions are captured by Markov-modulated Poisson processes. The model derives the close-form expressions of performance metrics including the mean number of packets in the system and in the queue, throughput, response time, delay, packet loss probability...
In IEEE 802.11, multicast protocol is based on the basic access procedure of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA). This protocol does not provide any recovery mechanism for multicast frames. As a result, transmitted multicast frames may be lost due to collisions or errors. Recently, several reliable multicast protocols at MAC layer have been proposed for 802.11. They can...
The networks literature suggests a network's value increases in the number of locations it serves (the ldquonetwork effectrdquo) and the number of its users (the ldquoproduction scale effectrdquo). In this article we discuss one of the technology innovation in optical industry- photonic integrated circuit (PIC) technology. We show that, in one hand, consumers (traditional carriers) would be very careful...
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