Handover failure

Hello,

I had a handover failure but i don’t understand why. Below the log message for layer 3 :

Quote:
106702 14:20:00.798 L3 DL RR Handover Command
BCCH: 49 BSIC: 00(dec) 00(oct)
Channel Type: TCH/F + FACCH/F and SACCH/F
TimeSlot: 6 TrainingSeq: 0
Hopping: Yes, MAIO: 2 HoppingSeq (HSN): 50
HandoverRef: 38 OrderedPowerLevel: 5
Target CA List: 34 46 (Variable Bit Map)
Channel Mode: Speech full rate or half rate version 3 (AMR FR/HR)
AMR – Multirate speech version 1:
Codec Count: 1
Codec Mode 1: Codec 12.20kbps,
Initial Codec Mode Indicator: Use Default
Initial Codec Mode: Codec 12.20kbps
Signal handoff from CHINON_EDF(CHINON_EDF_3) to Unknown(Unknown)

106703 14:20:00.798 Nemo Handover Attempt

Context Id: 152
Number of header parameters: 1,
Handover/handoff attempt type: GSM handover between cells,
Current cellular system: GSM,
Number of current system parameters: 3
Channel number: 20,
Timeslot number in use currently: 0
Band: GSM 900
Attempted cellular system: GSM,
Number of attempted system parameters: 3
Attempted channel number: 49,
Attempted timeslot: 6,
Band: GSM 900
106704 14:20:00.798 Nemo AMR Status
Cellular system: GSM
AMR Mode uplink: Codec 4.75kbps
AMR Mode downlink: N/A
AMR Last mode command: Codec 4.75kbps
AMR Last mode request: N/A
AMR Channel Type:
106705 14:20:00.798 Nemo AMR Link Quality Estimate

Cellular system: GSM,
AMR Link quality estimate (dB): 24.0 dB
106706 14:20:00.888 Nemo GPS information

Longitude: 0.107943,
Latitude: 47.2727,
Height: 20.000000 m,
Distance: 214653,
GPS fix quality: with GPS,
GPS satellites: 9, Velocity(km/h): 135 kph
106707 14:20:00.968 Cell measurement (CELLMEAS)

Cellular System: GSM
Band BCCH BSIC RxLev RxLevSub C1 C2 C31 C32 HCS HCS Cell ID LAC RAC Srxlev
Serv: GSM 900 20 2 -85 -84.0 – – – – 0 – 64604 18690 1 –
Neig: GSM 900 36 11 -89 – – – – – – – – – – –
Neig: GSM 900 23 21 -90 – – – – – – – – – – –
Neig: GSM 900 10 35 -92 – – – – – – – – – – –
Neig: GSM 900 49 0 -94 – – – – – – – – – – –
Neig: GSM 900 4 0 -96 – – – – – – – – – – –
Neig: GSM 900 29 23 -97 – – – – – – – – – – –
Neig: GSM 900 7 5 -98 – – – – – – – – – – –
Neig: GSM 900 15 – -100 – – – – – – – – – – –
Neig: GSM 900 12 1 -101 – – – – – – – – – – –
Neig: GSM 900 11 25 -101 – – – – – – – – – – –
Neig: GSM 900 1 – -101 – – – – – – – – – – –
Neig: GSM 900 2 34 -102 – – – – – – – – – – –
Neig: GSM 900 3 20 -103 – – – – – – – – – – –
Neig: GSM 900 25 4 -104 – – – – – – – – – – –
Neig: GSM 900 30 16 -104 – – – – – – – – – – –
Neig: GSM 900 14 17 -104 – – – – – – – – – – –
Neig: GSM 900 6 15 -105 – – – – – – – – – – –
Neig: GSM 900 9 – -106 – – – – – – – – – – –
Neig: GSM 900 47 – -106 – – – – – – – – – – –
Neig: GSM 1800 608 – -112 – – – – – – – – – – –
106708 14:20:00.968 Carrier Per Interference (CI)

Cellular System: GSM
Number of timeslot C/I measurement results: 0
Channel C/I: 15.6 dB
Number of channels: 3,
ARFCN C/I (dB) RSSI (dBm)
5 15.10 -84.90
8 15.80 -85.60
16 16.00 -86.70
106709 14:20:00.968 Nemo AMR Status
Cellular system: GSM
AMR Mode uplink: Codec 4.75kbps
AMR Mode downlink: Codec 4.75kbps
AMR Last mode command: Codec 4.75kbps
AMR Last mode request: N/A
AMR Channel Type:

106710 14:20:00.968 Nemo AMR Link Quality Estimate

Cellular system: GSM,
AMR Link quality estimate (dB): 22.0 dB
106711 14:20:01.887 Nemo GPS information

Longitude: 0.107537,
Latitude: 47.2729,
Height: 20.000000 m,
Distance: 214691,
GPS fix quality: with GPS,
GPS satellites: 9, Velocity(km/h): 135 kph
106712 14:20:02.887 Nemo GPS information

Longitude: 0.107127,
Latitude: 47.2731,
Height: 20.000000 m,
Distance: 214729,
GPS fix quality: with GPS,
GPS satellites: 9, Velocity(km/h): 135 kph
106713 14:20:03.888 Nemo GPS information

Longitude: 0.106713,
Latitude: 47.2733,
Height: 20.000000 m,
Distance: 214766,
GPS fix quality: with GPS,
GPS satellites: 8, Velocity(km/h): 135 kph
106714 14:20:03.968 Nemo Handover Failure

Context Id: 152

Could you please from the log above give me an idea about the handover failure ?

Thx in advance