1: Improve your calibratoin/board test program, orginate call after MS reboot and register
2: Utilize different ARFCN for nearby test station, for EXP: EGSM61 for station 1, EGSM63 for station 2.
3: Add some waiting time before PFER measurement after call orignate/handover, or do some other time consuming measurement first, for EXP: BER.