Adaptive Multi-Rate Wideband - Configurations For 3GPP

Configurations For 3GPP

When used in mobile phone networks, there are three different configurations (combinations of bitrates) that may be used for voice channels:

• Configuration A (Config-WB-Code 0): 6.6, 8.85, and 12.65 kbit/s (Mandatory multi-rate configuration)
• Configuration B (Config-WB-Code 2): 6.6, 8.85, 12.65, and 15.85 kbit/s
• Configuration C (Config-WB-Code 4): 6.6, 8.85, 12.65, and 23.85 kbit/s

This limitation was designed to simplify the negotiation of bitrate between the handset and the base station, thus vastly simplifying the implementation and testing. All other bitrates can still be used for other purposes in mobile phone networks, including multimedia messaging, streaming audio, etc.