【摘要】 对分层移动IPv6中的无线资源管理问题进行了研究,提出了一种基于动态阈值的呼叫接入控制(DT-CAC)策略。DT-CAC通过建立小区呼叫接入的马尔可夫排队模型,根据网络负载状态的变化对切换呼叫和新呼叫的接入阈值进行动态调整,在减少切换呼叫掉线率的同时限制新呼叫阻塞率的增加,从而在切换呼叫掉线率和新呼叫阻塞率之间取得平衡。大量仿真结果表明,DT-CAC与现有协议相比,在减小新呼叫阻塞率和切换呼叫掉线率以及提高资源利用率等方面具有较好的性能。当呼叫流量较大时,DT-CAC的新呼叫阻塞率和切换呼叫掉线率可以减少约6%左右,资源利用率可以达85%以上。更多还原

【Abstract】 The paper studies on radio resource management in hierarchical mobile IPv6, and proposes a dynamic thresholdbased call admission control (DT-CAC) scheme. Through establishing a Markov queuing model of wireless call admission, the proposed scheme can dynamically adjust the call admission thresholds of handoff call and new call according to various network load conditions, reduce the handoff call dropping probability (HDP), and restrict the increase of the new call blocking probability (CBP). Consequently, DT-CAC scheme can achieve a trade-off between HDP and CBP. The simulation results show that DT-CAC scheme outperforms the existing protocols in terms of HDP, CBP, and resource utilization. Under a high call traffic load, DT-CAC can reduce HDP and CBP by about 6%, achieve a high resource utilization ratio of more than 85%.更多还原