采用自適應(yīng)FEC的衛(wèi)星ATM網(wǎng)絡(luò)的有效帶寬估計(jì)
Estimation of Effective Bandwidth for Satellite ATM Networks with Adaptive FEC
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摘要: 該文針對(duì)采用自適應(yīng)FEC(AFEC)的衛(wèi)星ATM網(wǎng)絡(luò)，研究了兩種用于接納控制的有效帶寬估計(jì)方法，由于AFEC碼率的動(dòng)態(tài)特性使業(yè)務(wù)實(shí)際的傳輸速率具有不固定性，因此估計(jì)有效帶寬時(shí)要考慮AFEC的影響，作者首先針對(duì)一般衛(wèi)星時(shí)變信道和多碼率AFEC情況下的衛(wèi)星ATM，應(yīng)用流體近似方法分析了有效帶寬的計(jì)算，然而該方法要求的條件及計(jì)算復(fù)雜度均比較高，應(yīng)用中有局限性。以此方法為基礎(chǔ)，作者又提出了采用修正因子的估計(jì)方法，數(shù)值結(jié)果表明采用修正因子的有效帶寬估計(jì)方法比較簡(jiǎn)單可靠，適用面較廣。
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關(guān)鍵詞:
- 衛(wèi)星ATM; 自適應(yīng)FEC; 接納控制; 有效帶寬; 信元丟失率
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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