無(wú)比特丟棄的AAL2分組話音系統(tǒng)最優(yōu)分組長(zhǎng)度的研究
Optimal packet length for AAL2 packet voice system without bit dropping
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摘要: 該文根據(jù)分組話音業(yè)務(wù)的特點(diǎn)，結(jié)合分組話音業(yè)務(wù)服務(wù)質(zhì)量要求，特別是分組丟棄概率和端到端分組傳送時(shí)延的要求，研究AAL2分組話音系統(tǒng)中AAL2分組最優(yōu)長(zhǎng)度的確定方法，得出結(jié)論：對(duì)于無(wú)比特丟棄的AAL2分組話音系統(tǒng)，當(dāng)話音采用32kb/s的編碼時(shí)，AAL2分組的最優(yōu)長(zhǎng)度大約為31個(gè)字節(jié)；當(dāng)話音采用16kb/s的編碼時(shí)，AAL2分組的最優(yōu)長(zhǎng)度大約為27個(gè)字節(jié)。此時(shí)AAL2分組的分組頭開(kāi)銷(xiāo)小，話音分組的丟棄概率和端到端分組傳送時(shí)延低，所得的分組話音質(zhì)量高。
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關(guān)鍵詞:
- ATM; AAL2; 分組話音; 服務(wù)質(zhì)量
Abstract: This paper investigates the optimal packet length for AAL2 packet voice system without bit dropping, which takes into consideration the features and quality of service of AAL2 packet voice. A conclusion is drawn that the optimal packet length is about 31byte for the case of 32kb/s encoded voice when AAL2 packet voice multiplexer without bit dropping is concerned. As far as 16kb/s encoded voice is concerned, the optimal packet length is about 27 byte. Under this condition, good voice quality can be achieved with small packet overhead. -
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, 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, 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]D. Minoli, Optimal packet length for packet voice communication, IEEE Trans. on Commun.,1979, COM-27(3), 607-611.[6]C.F. Roger Tucker, Accurate method for analysis of a packet-speech mulitplexer with limited delay, IEEE Trans. on Commun., 1988, COM-36(4), 479-483. -
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