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首页> 外文期刊>Annals of telecommunications >Adaptive channel reservation for call admission control to support prioritized soft handoff calls in a cellular CDMA system
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Adaptive channel reservation for call admission control to support prioritized soft handoff calls in a cellular CDMA system

机译：用于呼叫接纳控制的自适应信道预留，以支持蜂窝CDMA系统中优先的软切换呼叫

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摘要

This paper proposes a prioritized call admission control (CAC) model to support soft handoff calls with quality of service (QoS) assurances for both the uplink and downlink connections in a CDMA system. CAC is formulated as a combinatorial optimization problem in which the problem objective is to minimize the handoff forced termination rate. The model, which is based on the adaptive channel reservation (ACR) scheme for prioritized calls, adapts to changes in handoff traffic where the associated parameters (reserved channels, and new and handoff call arrival rates) can be varied. To solve the optimization model, iteration-based Lagrangean relaxation is applied by allocating a time budget. We express our achievements in terms of the problem formulation and performance improvement. Computational experiments demonstrate that the proposed ACR scheme outperforms other approaches when there are fewer rather than more channels, and it reduces the handoff call blocking rate more efficiently when the handoff traffic is heavily loaded. Moreover, the model can be adapted to any kind of reservation service.
机译：本文提出了一种优先呼叫准入控制（CAC）模型，以支持CD​​MA系统中上行链路和下行链路连接的软切换呼叫，并具有服务质量（QoS）保证。 CAC被公式化为组合优化问题，其问题目标是最小化强制切换终止率。该模型基于用于优先呼叫的自适应信道保留（ACR）方案，可适应切换流量的变化，其中相关参数（保留的信道以及新呼叫和越区切换呼叫到达率）可以改变。为了解决优化模型，通过分配时间预算来应用基于迭代的拉格朗日松弛法。我们通过提出问题和改善绩效来表达我们的成就。计算实验表明，在信道少而不是信道多的情况下，所提出的ACR方案优于其他方法，并且在切换业务量较大时，可以更有效地降低切换呼叫阻塞率。而且，该模型可以适用于任何种类的预订服务。

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