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针对蜂窝网和无线局域网(WLAN)的融合网络,提出一种基于优先级的动态负载传递(PDLT)算法.呼叫接入控制的动态垂直切换由整个网络状态和业务特性以及终端位置信息联合触发.当蜂窝网络或WLAN中无可用带宽资源时,该算法能够将重叠覆盖区域中新的语音或者数据呼叫传递到尚有带宽资源的网络;同时,动态计算网络带宽资源占用情况,根据设定的门限值将正在进行的语音或数据通信切换到带宽资源宽裕的网络,平衡网络中的语音/数据呼叫数目.二维马尔科夫模型分析和仿真结果表明,PDLT算法能有效地提高整个网络中的业务接入量,减小新呼叫的阻塞概率,增加数据吞吐量并降低服务的响应时间.
A novel priority-based dynamic load transfer (PDLT) algorithm is proposed for converged networks of cellular and wireless local area networks (WLANs). The dynamic vertical handover of call access control is triggered by the joint state and service characteristics of the entire network and the terminal location information. When there is no available bandwidth resource in the cellular network or the WLAN, the algorithm can transfer the new voice or data call in the overlapping coverage area to the network which still has the bandwidth resource; meanwhile, dynamically calculate the occupancy of the network bandwidth resource, and according to the set gate The limit switches the ongoing voice or data communication to a network with ample bandwidth resources and balances the number of voice / data calls in the network. Two-dimensional Markov model analysis and simulation results show that the PDLT algorithm can effectively improve the entire network Service access, reduce the blocking probability of new calls, increase data throughput and reduce service response time.