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Effects of User Mobility on the Capacity of a CDMA Cellular Network

机译：用户移动性对CDMA蜂窝网络容量的影响

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摘要

In the recent technical literature on cellular networks Code Division Multiple Access (CDMA) has received a large attention as a promising radio interface access technique. Many studies are devoted to the capacity evaluation of the radio interface adopting CDMA, but seemingly none of them accounts for the variability of the user spatial density due to user mobility. This should be a concern especially in a microcellular environment, where it cannot be relied upon a significant spatial average over the radio coverage area of a Base Station. The major aim of this work is a preliminary assessment of the effects of "bursty" user mobility on the capacity of the CDMA radio interface. To this end, we introduce a user mobility model apt to describe large fluctuations of the number of users in a radio cell area. A reference model of a CDMA network is used to evaluate the effects of user mobility on the capacity for a wide range of the model parameters, by means of simulations accounting for shadowing, call attempt process, voice activity and antenna directivity and assuming perfect power control. We show that user mobility can remarkably affect the CDMA capacity, mainly because of the resulting highly bursty behaviour of self-noise. A simple traffic control scheme is devised to increase the capacity of the CDMA network, under a joint constraint on link availability, call blocking and call dropping probabilities. It is pointed out that the concepts introduced in this paper are independent of the specific CDMA implementation, i.e. they hold for any asynchronous CDMA based cellular network.
机译：在有关蜂窝网络的最新技术文献中，码分多址（CDMA）作为一种有前途的无线电接口接入技术已受到广泛关注。许多研究致力于采用CDMA的无线接口的容量评估，但似乎没有一项研究说明由于用户移动性导致的用户空间密度的可变性。尤其在微蜂窝环境中，这是一个值得关注的问题，在微蜂窝环境中，不能依赖于基站无线覆盖区域上的重要空间平均值。这项工作的主要目的是对“突发”用户移动性对CDMA无线电接口容量的影响进行初步评估。为此，我们引入了一种用户移动性模型，该模型易于描述无线电小区区域中用户数量的巨大波动。 CDMA网络的参考模型用于通过考虑阴影，呼叫尝试过程，语音活动和天线方向性并假设完美功率控制的仿真来评估用户移动性对各种模型参数容量的影响。 。我们表明，用户移动性可以显着影响CDMA容量，这主要是由于产生的自噪声高度突发性。在链路可用性，呼叫阻塞和掉话概率的共同约束下，设计了一种简单的流量控制方案来增加CDMA网络的容量。应当指出，本文介绍的概念独立于特定的CDMA实现，即它们适用于任何基于异步CDMA的蜂窝网络。

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