采用自适应FEC的卫星ATM网络的有效带宽估计
Estimation of Effective Bandwidth for Satellite ATM Networks with Adaptive FEC
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摘要: 该文针对采用自适应FEC(AFEC)的卫星ATM网络，研究了两种用于接纳控制的有效带宽估计方法，由于AFEC码率的动态特性使业务实际的传输速率具有不固定性，因此估计有效带宽时要考虑AFEC的影响，作者首先针对一般卫星时变信道和多码率AFEC情况下的卫星ATM，应用流体近似方法分析了有效带宽的计算，然而该方法要求的条件及计算复杂度均比较高，应用中有局限性。以此方法为基础，作者又提出了采用修正因子的估计方法，数值结果表明采用修正因子的有效带宽估计方法比较简单可靠，适用面较广。Abstract: This paper presents two effective bandwidth estimation methods for connection admission control in satellite ATM networks with Adaptive FEC (AFEC). Due to the dynamic code rate of AFEC, its effect would be taken into account in estimating the effective bandwidth. A fluid approximation method is first applied to estimate the effective bandwidth values for general time-varying satellite channels and satellite ATM network with multiple-code-rate AFEC. But the requirements of the method are strict and its computing complexity is high for practical purposes. Based on this method, the authors propose a second estimation method by using a modification factor. the numerical results show the second method is simple and effective and widely applicable.
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