AMR/WB-AMR Speech Rates Control

AMR/WB-AMR Speech Rates Control

This feature enables the adjustment of AMR/AMR-WB speech rates. This feature can ensure a continuous service, expand the service coverage, and reduce the cell load.

When the radio environment is good, a high-rate codec can provide better speech quality than a low-rate codec.

When the radio environment is poor, a low-rate codec can provide better speech quality than a high-rate codec.

Thus, the rate of the AMR codec should be adjusted in real time to ensure high-quality speech services.

Before RAN5.0, AMR rate considers the DL transmitted power for DL and UE transmitted power for UL.

In RAN5.1, cell load is used for AMRC trigger,

Dependency: UE & Core Network