Codec Management

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Codec Management Objectives

Codec Management has following goals:
1.) Optimize the voice quality.
2.) Optimize the bandwidth efficiency
3.) Optimize the transcoder resource in MGW.
4.) Optimize the delay

Voice Quality:

Voice quality is measured in terms of the level, attenuation, delay, echo, and so on and may be used as a basis for the iQoS assessments for conventional VoIP. Voice Quality is measured in terms of R-value and below 50 are not recommended.

Standards                                     Intrinsic quality (R)
------------------------------------------------------
ITU G.711 (64kbps)                                  94.3
ITU G.728 (12.kbps)                                 74.3
ETSI GSM-FR (13kbps)                           74.3
ETSI GSM-HR (5.6kbps)                          71.3
ETSI GSM-EFR (12.2kbps)                      89.3
-----------------------------------------------------


Transcoding can be harmful for voice quality of a call and should be avoided if possible. In 2G, BSC is in charge of transcoding while MSC is the incharge of transcoding in 3G. We have intention to minimise the Transcoder to enhance the voice quality.

Bandwidth efficiency:

Legacy networks use a consistent 64 kbps per channel. Use G.711, packet networks easily surpass 64 kbps. Therefore, compress codecs must be used on core.  Compression ratio of 8:1can be achieved with compressed codecs along with the following techniques : silence suppression, AAL2/RTP multiplexing, IP header compression.

Transcoder Resources optimization:

The third goal of the codec management is to optimize the transcoder resources in the MGW. So, TrFO must be used whenever possible.

Optimization of delay:

Delay can be minimized if reduce the number of transcoders. We can reduce the transcoding time in call.

Comments

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