3.1  Definitions  p. 5

3.2  Symbols  p. 6

3.3  Abbreviations  p. 6

4.1  Setup for Terminals  p. 6

4.2  Setup of the electrical interfaces  p. 7

4.3  Accuracy of test equipment  p. 9

4.4  Test signals  p. 9

5.1  Delay in sending + receiving direction using "echo" method  p. 10

5.2  Speech enhancement processing in the UE and its potential impact on the determination of MOS-LQO scores  p. 11

5.3  Speech quality loss in sending direction  p. 13

5.4  Speech quality loss in receiving direction  p. 14

6.0  General  p. 15

6.1  Scenario 1: Impairments at the physical layer  p. 15

6.2  Scenario 2: Impairments at the internet layer (IP impairments)  p. 16

6.3  Scenario 3: Operation with different modes / bit-rates (reference)  p. 16

6.4  Scenario 4: Switching bit-rates / operating modes during a call  p. 17

6.5  Scenario 5: Codec change initiated by remote UE  p. 17

6.6  Scenario 6: Intra-RAT Handover  p. 18

6.7  Scenario 7: Inter-RAT Handover  p. 18

6.8  Scenario 8: Operation with DRX  p. 18

6.9  Scenario 9: Voice call with simultaneous data upload/download  p. 19