无比特丢弃的AAL2分组话音系统最优分组长度的研究
Optimal packet length for AAL2 packet voice system without bit dropping
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摘要: 该文根据分组话音业务的特点，结合分组话音业务服务质量要求，特别是分组丢弃概率和端到端分组传送时延的要求，研究AAL2分组话音系统中AAL2分组最优长度的确定方法，得出结论：对于无比特丢弃的AAL2分组话音系统，当话音采用32kb/s的编码时，AAL2分组的最优长度大约为31个字节；当话音采用16kb/s的编码时，AAL2分组的最优长度大约为27个字节。此时AAL2分组的分组头开销小，话音分组的丢弃概率和端到端分组传送时延低，所得的分组话音质量高。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.
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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, 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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