| 基于QOS升降级的无线单播多播混合带宽资源分配方法 |
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| 引用本文： | 陈月云,谈振辉.基于QOS升降级的无线单播多播混合带宽资源分配方法[J].北京交通大学学报(自然科学版),2011,35(3). |
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| 作者姓名： | 陈月云 谈振辉 |
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| 作者单位： | 北京交通大学轨道交通与安全同家重点实验室,北京100044;北京科技大学计算机与通信工程学院,北京100083;北京交通大学轨道交通与安全同家重点实验室,北京,100044 |
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| 基金项目： | 国家自然科学基金资助项目(60902042); 北京市自然科学基金资助项目(4102041) |
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| 摘 要： | 在单播与多播混合服务的OFDM蜂窝系统中,因负载较重而使带宽资源被完全占用时,为接纳更多的多播用户,在单播多媒体用户可接受的范围内提出:基于信道容量平滑的QoS升降级带宽借用方法.通过建立QoS升降级的子载波借用模型和CUpDown-QoS算法,达到最大化多播用户数和减小多播切换呼叫中断率;提出了GoS保证下,限制新呼叫的动态带宽借用阈值,给出基于Markov模型的CBP(Call Blocking Probability)与HDP(Handoff Dropping Probability)最优折中的阈值确定方法,以及多播优先的动态带宽借用策略对阈值确定的影响.
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| 关 键 词： | 无线通信 QoS升降级 单播 多播 带宽分配 |
Bandwidth resource assignment scheme based on QoS upgrade/downgrade in wireless unicast and multicast integrated services systems |
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| CHEN Yueyun,TAN Zhenhui.Bandwidth resource assignment scheme based on QoS upgrade/downgrade in wireless unicast and multicast integrated services systems[J].JOURNAL OF BEIJING JIAOTONG UNIVERSITY,2011,35(3). |
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| Authors: | CHEN Yueyun TAN Zhenhui |
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| Institution: | CHEN Yueyun1,2,TAN Zhenhui1(1.State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University,Beijing 100044,China,2.Computer and Communication Engineering School,University of Science & Technology Beijing,Beijing 100083,China) |
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| Abstract: | In an OFDM cellular system with unicast and multicast integrated services,in order to admit more multicast members when the bandwidth resource are all occupied because of heavy load,a scheme of borrowing enough bandwidth based on the channel capacity from unicast multimedia users' smoothly upgrading or downgrading their QoS level within an accepted range is suggested.Maximizing the multicasting members and lowing multicasting handover dropping probability are realized by establishing a QoS upgrading/downgra... |
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| Keywords: | wireless communications QoS upgrade-downgrade unicast multicast bandwidth assignment |
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