AAL2分组话音复接器缓冲器队列容量的确定方法
Study on the buffer size of AAL2 packet voice multiplexer
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摘要: 该文研究AAL2分组话音复接器缓冲器队列容量的确定方法。提出并从理论上证明用话音分组的最大排队时延为9ms作为确定缓冲器队列容量的标准,可很好地满足分组话音业务服务质量要求的结论,并推导出缓冲器队列容量及门限值的计算公式。仿真结果表明:按作者提出的方法确定缓冲器队列容量及门限值,可获得较低的分组丢弃概率和较小的平均分组排队时延;在满足分组话音业务服务质量要求的前提下,减少了话音分组缓冲器队列的容量,是一种很好的确定缓冲器队列容量和门限值的方法。Abstract: This paper studies the ways to determine the buffer size of the AAL2 packet voice multiplexer with bit dropping. A conclusion is drawn that the buffer size which corresponds to the delay budget of 9 millisecond is sufficient to meet the quality of service requirements of AAL2 packet voice. An algorithm for determining the buffer size and the bit dropping thresholds is also presented with relevant computation formula. The computer simulation results show that the algorithm presented here is good for determining the buffer size and the bit dropping thresholds with small packet loss probability, low packet delay and high mean bits per sample and can greatly improve the buffer efficiency.
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K. Sriram, T. G. Lyons, Y. -T. Wang, Anomalies due to delay and loss in AAL2 packet voice systems: Performance models and methods of mitigation, IEEE J. on SAC., 1999, SAC-17(1),4-17.[2]K. Sriram, Y. -T. Wang, Voice over ATM using AAL2 and bit dropping: Performance and call admission control, IEEE J. on SAC., 1999, SAC-17(1), 18-28.[3]K. Sriram, D. M. Lucantoni, Traffic smoothing effects of bit dropping in a packet voice multiplexer,IEEE Trans. on Commun., 1989, COM-37(7), 703-712.[4]K. Sriram, W. Whitt, Characterizing superposition arrival processes in packet multiplexer for voice and data, IEEE J. on SAC., 1986, SAC-4(6), 833-846.[5]ITU-T Recommendation G.727: 5-, 4-, 3-, and 2-bits Sample Embedded Adaptive Differential Pulse Code Modulation(ADPCM), Geneva, CH: ITU, 1990. -
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