认知无线电网络中具有业务优先级的动态频谱接入

M. Safwat
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引用次数: 7

摘要

认知无线网络(CRN)使认知用户能够使用主用户(PU)的部分许可频谱。动态频谱接入(DSA)是一种便于认知无线电(CR)用户在空闲信道上传输的设计方法。在许多情况下,CR用户受到平等对待是不可取的。向一些CR用户提供服务质量(QoS)是DSA设计中的一个挑战。在这种情况下,CR用户流量被划分为高优先级和低优先级。子信道保留(SCR)方案是最传统的为CR用户提供准入优先权的方案。本文提出了一种新的为CR用户提供QoS的“低优先级边界”(LPB)方案。LPB方案通过阈值限制低优先级CR用户的数量来提供优先级。该方案为高优先级用户提供适当的服务水平(如SCR方案所提供的),同时改善低优先级用户的服务水平。因此,与SCR方案相比,LPB方案的收益得到了优化。从阻塞概率、业务终止率和业务完成率三个方面评估LPB方案对所提供QoS的影响。仿真结果与SCR方案进行了比较,结果表明LPB方案比传统的SCR方案能显著提高收益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dynamic spectrum access with traffic prioritization in Cognitive Radio networks
Cognitive Radio networks (CRN) enable cognitive users to use portions of the licensed spectrum of the primary users (PU). Dynamic spectrum access (DSA) is a design aspect that facilitates the transmission of cognitive radio (CR) users over idle channels. In many cases, it is not preferable that CR users to be treated equally. Provisioning quality of service (QoS) to some CR users is a challenge in DSA design. In this situation, The CR user traffic is divided into high and low priority classes. Sub-channel reservation (SCR) scheme is the most traditional scheme to provide priority to CR users in admission. In this paper, a new scheme named “low priority bounding” (LPB) scheme is used to provide QoS for CR users. The LPB scheme provides priority by restricting the number of low priority CR users by a threshold. This scheme maintains a suitable level of service to high priority users (as provided by SCR scheme) while improve the level of service for low priority ones. So the revenue gained from LPB scheme is optimized in comparison with SCR scheme. The impact of LPB scheme in the provided QoS is evaluated in terms of blocking probability, service termination rate, and service completion rate. Simulation results are compared with SCR scheme and it shows that the LPB scheme can significantly improve the revenue gained over the traditional SCR scheme.
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