What does MOS means in GSM/UMTS terms?

[patek1968]

Hi all, sorry to put this thread here..I'm wondering what's the definition of the term MOS in GSM/UMTS parameter? Can anybody help me out to figure this thing? I googled it already and I'm not satisfied..Please share your thoughts about it..:)

[T_ADD]

MOS - Mean Opinion Score

Its a means of rating a network's voice quality. It usually ranges from 1-5. The higher the score, the higher the quality.

check wiki article for more detailed info - Mean opinion score - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Mean_opinion_score)

[gencerali]

Hello,

MOS has same algortihm for 2G and 3G. (For Non WB-AMR Calls). So MOS is independent of used technology, it is only dependent on end to end voice. MOS is affected by many reasons:
-Codec type (AMR FR & EFR has highest value)
-Codec Rate (12.2 kbps gives highest value)
-RF Conditions
-Mobility (Handover, Codec Rate Change has negative effect on MOS)
-Core Network Parameters or Silence, Echo, DTX etc.
-Noise Reduction Algorithms

Recently P.OLQA algorithm is available for P 862.2 MOS measurement algorithm. This algorthm is used for WB-AMR calls besides previous codec types. But mapping is different.

I hope I could help,

Regards,
Ali