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In this work, a new approach for dynamically allocating high priority probability and high priority slots in PR-ALOHA (Reserved ALOHA with Priority) was introduced. The Dynamic Slot Allocation (DSA) algorithm in PR-ALOHA is performed by dynamically allocating the number of high priority slots and high priority probability based on the available traffic. The performance of the system with DSA algorithm...
In this paper, we propose a new 802.16 Qos scheduling architecture based on GPSS, integrating some kinds of existing scheduling algorithms. Then we design a simulation experiment to validate the effectiveness of the Qos scheduling architecture using Anylogic. The simulation results prove the new QoS architecture is effective, which can not only meet the delay requirement of real time applications,...
The medium access control (MAC) protocol defined in IEEE 802.15.4 standard is being considered as a promising technology for low-cost and low power wireless sensor networks (WSNs). In fact, the current IEEE 802.15.4 specifications don't avoid hidden node problem (HNP). In this paper, proposed scheme is dynamic group allocation scheme for avoiding HNP Based on grouping strategy for solving hidden node...
Cognitive wireless networks benefit from context awareness which is integrated in decision making process in different layers. In this paper, we modify the MAC layer transmission permission probability, for elastic traffic users, in such a way to discourage the transmissions from/to the users at the border of the cell where transmissions cause significant interference in adjacent cell. This will be...
A fully packet switched access network such as 3G LTE imposes new challenges for real time voice services. Packet drop, delay variation, and random channel fading calls for variations of scheduling technique to address the challenging technical difficulties arising due to the migration from circuit switched domain. A new challenge of starvation comes due to provisioning different services with different...
To address inefficiency of the spectrum utilization and the limited available spectrum band, cognitive radio has emerged as a significant solution. In this paper, we propose a novel MAC protocol in multi-channel wireless networks by using dynamic spectrum allocation (DSA) based on cognitive radio for QoS support. According to the user request, variable spectrum is allocated for quality of service...
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