AAL2分組話(huà)音復(fù)接器緩沖器隊(duì)列容量的確定方法
Study on the buffer size of AAL2 packet voice multiplexer
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摘要: 該文研究AAL2分組話(huà)音復(fù)接器緩沖器隊(duì)列容量的確定方法。提出并從理論上證明用話(huà)音分組的最大排隊(duì)時(shí)延為9ms作為確定緩沖器隊(duì)列容量的標(biāo)準(zhǔn),可很好地滿(mǎn)足分組話(huà)音業(yè)務(wù)服務(wù)質(zhì)量要求的結(jié)論,并推導(dǎo)出緩沖器隊(duì)列容量及門(mén)限值的計(jì)算公式。仿真結(jié)果表明:按作者提出的方法確定緩沖器隊(duì)列容量及門(mén)限值,可獲得較低的分組丟棄概率和較小的平均分組排隊(duì)時(shí)延;在滿(mǎn)足分組話(huà)音業(yè)務(wù)服務(wù)質(zhì)量要求的前提下,減少了話(huà)音分組緩沖器隊(duì)列的容量,是一種很好的確定緩沖器隊(duì)列容量和門(mén)限值的方法。
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關(guān)鍵詞:
- 分組話(huà)音; ATM; AAL2; 比特丟棄
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. -
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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