A New Defined Lower Bit Rate AMR Mode in GSM and WCDMA Networks

Yi-Feng Guo,Geng-Sheng Kuo

doi:10.1109/vetecs.2007.159

A New Defined Lower Bit Rate AMR Mode in GSM and WCDMA Networks

Yi-Feng Guo, Geng-Sheng Kuo

https://doi.org/10.1109/vetecs.2007.159

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Publication Date: Apr 1, 2007

Citations: 1

Affiliation: Beijing University of Posts and Telecommunications, National Chengchi University

#GSM Networks #WCDMA Networks + Show 8 more

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Abstract

Adaptive multi-rate (AMR) codec can adaptively select one of eight modes according to the channel condition or the system load. AMR allows making a trade-off between voice capacity and the voice quality. In GSM networks, when the channel condition is worse than the threshold, the voice quality is unacceptable even using the lowest rate mode (4.75 kbps). In this paper, by compressing the AMR frame, a new defined lower bit rate AMR mode with 3.95 kbps is proposed to guarantee the voice quality in this case. The proposed mode is completely compatible with the specified AMR codec in standard. Moreover, this mode can be adopted in WCDMA networks. Compared with 12.2 kbps mode, this new one can increase the capacity by 135% and increase the coverage gain by 2.6 dB.

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