MOS value is an important index to measure the voice quality of communication system. At present, the MOS test method of DT is mainly through the voice box unit connected to the voice link of the mobile phone's calling party.
The downlink MOS value of the talking phone is realized by sending a standard voice waveform from the talking phone, which is reached through the network.
The degree of voice restoration is 1.0, generally between 3-4, and the following 3 is poor, which has a lot to do with the wireless channel coding method