Network selection policy in multi-radio access environment using stochastic control theory

来源 :The Journal of China Universities of Posts and Telecommunica | 被引量 : 0次 | 上传用户:zjubaoli
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Network selection is crucial in improving the performance of heterogeneous wireless access systems.Most of previous work on network selection or radio resource allocation concentrates on the capability of each available network and ignores the time-varying nature of wireless media due to channel fading.However,the channel condition determines the state of each wireless network and plays a vital role in ensuring quality of service in multi-radio access environment.In this article,we propose a network selection policy using stochastic control theory considering the time-varying and stochastic character of wireless channels.The proposed scheme selects one network among different alternatives in each decision epoch according to the channel state of each network,which is modeled as finite-state Markov channel,with the objectives of increasing the data-rate,decreasing the bit error rate and minishing the delay.The procedure of network selection is formulated as a stochastic control problem,which can be solved using linear programming and primal-dual index heuristic algorithm.Simulation results are presented to show that network selection has great impact on the system performance,and the proposed scheme can improve the performance significantly. Network selection is crucial in improving the performance of heterogeneous wireless access systems. Host of previous work on network selection or radio resource allocation concentrates on the capability of each available network and ignores the time-varying nature of wireless media due to channel fading. However, the channel condition determines the state of each wireless network and plays a vital role in assurance quality of service in multi-radio access environment. this article, we propose a network selection policy using stochastic control theory considering the time-varying and stochastic character of wireless channels. proposed scheme selects one network among different alternatives in each decision epoch according to the channel state of each network, which is modeled as finite-state Markov channel, with the objectives of increasing the data-rate, decreasing the bit error rate and minishing the delay. The procedure of network selection is formulated as a stochastic control problem, w hich can be solved using linear programming and primal-dual index heuristic algorithm.Simulation results are presented to show that network selection has great impact on the system performance, and the proposed scheme can improve the performance significantly.
其他文献
本文利用无源协调性思想和Backstepping设计方法得到静止无功补偿器和发电机励磁的控制设计,使得系统达到系统功角和电压稳定的效果.整个设计过程没有采用任何线性化的处理,
本文采用实验室模拟的方法,将鲫鱼(Carassiusauratus)分别暴露于五氯酚(PCP)、2,4,6-三氯酚(2,4,6-TCP)10d后,运用SDS-PAGE和WesternBlotting方法检测鱼脑组织内应激蛋白HSP7
本文介绍了江西电网水、火电机组协调控制的实现方法,提出了对水、火电机组分类并施以不同控制策略的新思路:让水电机组调节ACE、火电机组跟踪负荷的趋势分量,可以发挥各自的
目前电力信息系统尚缺乏定量化的安全体系设计方法和辅助工具.本文提出了一种基于模式的定量化安全体系设计方法.它采用攻击模式和保护模式分别对攻击行为和安全措施建模,并
会议
鉴于大电力系统的复杂性,有必要对其进行静动态安全性综合评估.本文以包括宁夏电网发输电系统在内的西北电网作为研究对象,阐明了发输电系统静动态安全性综合评估的主要流程.
会议
谐波污染常常导致代价昂贵的事故发生,因谐波含量过大引起的电压梯度过大,对并联电容器有严重的危害。因此,对电力系统中作为无功补偿的电容器组,研究在受多谐波源作用时其参数的
会议
本文介绍了一种适用于电力系统短路试验的实时数据采集和控制的系统.首先介绍了高精度定时的实现以及定时起点的获得.然后主要阐述了此控制系统中如何实现合闸角的准确控制.
营养调查是飞行人员饮食保障中的重要环节,是制定食谱、膳食治疗和健康教育的重要参考依据。但由于部队开展营养调查工作难度大,在很大程度上影响了饮食保障的科学化和规范
随着全国联网、西电东送、南北互供工程建设步伐的加快,互联电网规模日益扩大,电网动态特性趋于复杂,建立电网动态监测系统对加强我国大电网的安全可靠性是必要的.基于广域测
会议
本文总结了目前我国电网电压调整和电压管理的基本状况,介绍了基于单个母线电压的无功电压自动控制方法(VQC),介绍了新型动态无功补偿装置及其应用前景,指出了基于全网无功优