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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