User manual

Troubleshooting 6
N9360A Multi UE Tester GSM User Manual 6-3
—— is displayed at the
measurement of
Sensitivity BER.
Is the BER BS level or the
Sens BS level weak?
(The above values may differ
according to the Radio
System.)
Raise the BER BS level
or the Sens BS level.
Set the lower BER Frame.
Is the PWR CTRL low? Set the higher PWR CTRL.
Is path loss set correctly? Set path loss between the Tester and a mobile phone at Loss
on the [Configuration] screen
Does the slot configuration
conform to the multislot
class of the mobile phone?
Set the slot configuration which conforms to the multi-slot
class of the mobile phone.
Does this symptom still
occur in spite of above three
remedies?
If a UL RLC/MAC payload happens to contain the Length
indicator fields during the GPRS BER measurement, GPRS
BER can not be measured precisely. (for the future, the above
problem is to be solved.)
The phases of the PN data except PN9fix are supposed to be
continuous during the measurement. If the phases become
discontinuous halfway, Sensitivity BER can not be measured
precisely.
EGPRS BLER does not
result in 0,00%.
Is the BS level weak? Raise the BS level.
Is there interference from the
external noise?
Shut out external noise by using the shield case, etc.
Is path loss set correctly? Set path loss between the Tester and a mobile phone at Loss
on the [Configuration] screen
Does this symptom still
occur in spite of above three
remedies?
The DL EVM of the Tester which is below 12,5% may have a
negative influence on EGPRS BLER.
Radio performance tests
tend to fail.
Is there interference from the
external noise?
Shut out external noise by using the shield case, etc.
Is path loss set correctly? Set path loss between the Tester and a mobile phone at Loss
on the [Configuration] screen.
Is TCH for handover set
adjacent to BCCH?
When handing over to TCH is adjacent to BCCH, handover
can fail.
Set the frequency of TCH away from that of BCCH.
Handover fails. Does the mobile phone
require Detach process?
Some kinds of GPRS mobile phones are confirmed that they
require Detach from Attached condition.
In this case, the Tester cancels Attached condition. Retest
from Location Update.
Table 6-1 Item to be checked
Symptom Section to be checked Remedy