The 6103 AMR Air Interface Monitor and Emulator (AIME) has been designed to address the demanding test requirements posed by the introduction of AMR technology. It is a modular system which emulates an AMR capable GSM network and has been developed specifically for testing the Layer 1 and Layer 3 performance of GSM AMR capable terminals. The modular concept allows the user to configure the system to his particular requirements. For Research and Development applications, the 6103 AMR AIME is capable of the following functionality:

• Verification of correct coding of frames by examining data visually at the d interface (8 coding schemes for full rate, 6 coding schemes for half rate).
• Confirmation of coding of frames and parity (each output polynomial can be separately verified).
• Verification of correct coding of frames associated with DTX.
• Verification of correct coding of RATSCCH frames.
• Verification of correct implementation of procedures associated with RATSCCH messages.
• Verification of correct demodulation and decoding.
• Confirmation of the correct operation of the adaptive nature of AMR speech frames.
• Verification of correct behavior of the receive sub-system when presented with frames with bad CRC and invalid in-band signaling combinations.
• Verification of subjective operation of codecs (both encode and decode).

A selection of example scripts is provided with the system and these may be used to form the basis of a test campaign. A Layer 3 Encoder tool is also available. This software package allows the user to quickly and simply encode any standard GSM 04.08 Layer 3 message for inclusion in the control script.

The basic 6103 AMR AIME system may be easily upgraded to allow conformance testing of AMR capable mobile terminals to 3GPP specification 51.010-1.