| 异构分层无线网络中基于业务和逗留时间的动态流量均衡算法 |
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| 引用本文： | 宁国勤,彭烈新,卢小峰,朱光喜.异构分层无线网络中基于业务和逗留时间的动态流量均衡算法[J].计算机科学,2007,34(4):32-37. |
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| 作者姓名： | 宁国勤 彭烈新 卢小峰 朱光喜 |
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| 作者单位： | 1. 华中师范大学信息技术系,武汉430079;华中科技大学武汉光电国家实验室,武汉430074
2. 华中科技大学武汉光电国家实验室,武汉430074 |
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| 摘 要： | 在异构分层无线网络中使用有效的流量均衡技术，可以给更多的移动用户提供服务。现有的流量均衡算法主要针对同种无线网络，因而不能直接用于异构无线网络。本文提出了一种适用于异构无线网络的基于业务和逗留时间的动态流量均衡算法，该算法首先根据移动模型计算移动用户在小区内的逗留时间，然后基于小区呼叫到达率和重叠覆盖小区的流量状态来确定一个周期内转移的非实时性呼叫数量，最后依据逗留时间门限值将重负载小区中满足条件的呼叫转移到轻负载的重叠覆盖小区中。为降低切换呼叫掉线率，还对异构网间的呼叫切换策略做了改进。仿真实验结果表明．本算法在新呼叫阻寒率和切换呼叫掉线率等性能指标上比传统方法有显著提高．
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| 关 键 词： | 异构分层无线网络 流量均衡 逗留时间 呼叫阻塞率 呼叫掉线率 |
Dynamic Load Balancing Algorithm Based on Traffic and Sojourn Time in Heterogeneous Hierarchical Wireless Networks |
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| NING Guo-Qin,PENG Lie-Xin,LU Xiao-Feng,ZHU Guang-Xi.Dynamic Load Balancing Algorithm Based on Traffic and Sojourn Time in Heterogeneous Hierarchical Wireless Networks[J].Computer Science,2007,34(4):32-37. |
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| Authors: | NING Guo-Qin PENG Lie-Xin LU Xiao-Feng ZHU Guang-Xi |
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| Abstract: | Efficient load balancing algorithm can be used to serve more mobile stations in the heterogeneous hierarchical wireless networks. The existing load balancing algorithms, which were designed for homogeneous networks, are not applicable to the heterogeneous wireless networks. This paper proposed a dynamic load balancing algorithm based on traffic and sojourn time for heterogeneous hierarchical wireless networks. Firstly, based on user mobile model, the sojourn time of each mobile station in cells was calculated, then the number of transferred ongoing non-real-time calls per load balancing period was counted according to the new calls arrival rate of overloaded cell and the workload states of overlapping cells. Finally, those ongoing calls with longer sojourn time than the threshold were swithched from overloaded cells to overlapping heterogeneous under-loaded cells, which can balance the system workload. In addition, in order to decrease the handoff call dropping probability, the vertical handoff schemes between different wireless networks were improved. Simulation results show that the proposed dynamic load balancing algorithm performs much better than existing algorithms with respect to the blocking probability, dropping probability and etc. |
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| Keywords: | Heterogeneous hierarchical wireless networks Load balancing Sojourn time Call blocking probability(CBP) Call dropping probability (CDP) |
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