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Cognitive radio networks have been proposed as a solution to both spectrum inefficiency and spectrum scarcity problems. However, they face to a unique challenge based on the fluctuating nature of heterogeneous spectrum bands as well as the diverse service requirements of various applications. In this paper, a spectrum decision framework is proposed to determine a set of spectrum bands by considering...
In this paper, the Multiprocessor Bandwidth Inheritance (M-BWI) protocol is presented, which constitutes an extension of the Bandwidth Inheritance (BWI) protocol to symmetric multiprocessor and multicore systems. Similarly to priority inheritance, M-BWI reduces priority inversion in reservation-based scheduling systems, it allows the coexistence of hard, soft and non-real-time tasks, it does not require...
Modern real-time systems increasingly operate with multiple interactive applications. While these systems often require reliable quality of service (QoS) for the applications, even under heavy workloads, many existing CPU schedulers are not very capable of satisfying such requirements. In this paper, we design and implement an Advanced Interactive and Real-time Scheduler, called AIRS. AIRS is aimed...
A full exploitation of the computational power available in a multi-core platform requires the software to be specified in terms of parallel execution flows. At the same time, modern embedded systems often consist of more parallel applications with timing requirements, concurrently executing on the same platform and sharing common resources. To prevent reciprocal interference among critical activities,...
In order for the base station to respond quickly and efficiently to the uplink bandwidth request in broadband wireless access (BWA) networks using time-division duplex (TDD), a dual feedback control algorithm has recently been proposed. In this algorithm the bandwidth request is adjusted in accordance with both the length of the backlogged queue and the mismatch between packet arrival and service...
The huge coverage space of IPv6 addresses and providing guaranteed support for the ever increasing customer demand, results in the dealing with bigger packet header-size compared to the payload-size especially in some real time video and audio applications, consequently more bandwidth is wasting. Using the advantages of MPLS with IPv6 is still one of the migration challenges at the backbone. Payload...
By communicating and information exchange, agents can fulfill goals of multi-agent systems. Different communication languages and protocols have been proposed for agents. These languages are designed to transfer high level data and donpsilat have appropriate efficiency to send sensing. hearing and visual information in real environments. In this paper a model to exchange such kind of data in an efficient...
Success of emerging satellite-based services depends on the performance of communication protocols like TCP, which degrades in wireless environments. TCP with delayed fast recovery and adaptive flow control (TCP-AFC) has been evaluated through simulation experiments showing significant performance enhancement in wireless environments in general and satellite networks in particular. TCP-AFC enhances...
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