7746 CH CONGESTION IN CELL ABOVE DEFINED THRESHOLD
Meaning
The percentage of rejected channel seizure requests due to congestion
as opposed to all channel seizure requests in the base station is
above the operator-defined alarm threshold. In the segment environment
this alarm describes the congestion situation of the whole cell although
it is only given to the BCCH BTS.
The alarm is used to supervise the traffic capacity of the base
station.
Supplementary information fields
1 object of congestion
01 SDCCH
02 TCH
03 extended cell SDCCH
04 extended cell TCH
2 the time (hours, minutes) when congestion was last observed during
the measurement period
3 number of channel seizure requests during the measurement period
4 percentage of rejected SDCCH or TCH (depending on the
congestion object) seizure requests due to congestion in all
channel seizure requests during the measurement period. The
TCH percentage includes all half rate, full rate and rate
recommendation channel seizure requests
5 percentage of rejected half rate channel seizure requests due
to congestion in all seizure requests during the measurement period;
only significant, if the congestion object is a TCH
6 percentage of rejected full rate channel seizure requests due
to congestion in all seizure requests during the measurement period;
only significant, if the congestion object is a TCH
7 this new field is significant only if the congestion object is a TCH.
The new field is a percentage value and indicates how big a portion
of the refused TCH requests (field refused_calls_percentage) have
been refused due to lack of traffic handling capacity in the BCSUs.
Instructions
Increase the network capacity if necessary.
Check that the parameters affecting the alarm are reasonable.
MML command EEO outputs the radio network supervision parameter values,
EEN command modifies the parameter values.
Parameters, with their default values, affecting the alarm:
ZEEN: CSR: channel seizure request threshold value (10)
CNGS: SDCCH congestion threshold value (20 %)
CNGT: TCH congestion threshold value (20 %)
PRDCNG: length of congestion supervision period (120 min)