404 Switchback after Baseband FH Mutual Aid in a Cell

Description

This alarm is reported when all the faulty TRXs that participate in baseband frequency hopping (FH) are restored in a cell. The baseband FH function of this cell is also restored.

Attribute

Alarm ID	Alarm Severity	Alarm Type
404	Major	Event

Parameters

ID	Name	Meaning
1	Cell Index.	Index of the cell where the switchback occurs
2	Cell Name	Name of the cell where the switchback occurs
3	Cell CGI	Cell Global Identifier of the cell where the switchback occurs
4	Site No.	Number of the site where the cell generating an alarm is located
5	Site Name	Name of the site where the cell generating an alarm is located
6	Alarm Attribute	0=Normal, Alarms period are longer than the Transient Threshold. 1=Transient Count, The times and the period of the alarms whose periods are shorter than the Transient Threshold are summed up. If the sum result is longer than the Alarm Occurrence Period Threshold or Alarm Occurrence Times Threshold, an alarm so called Transient Count Alarm is triggered. Because Transient Count Alarm is based on accumulative result, the recovery of the alarm may occur at least one Summing Cycle later. The Summing Cycle can be query by MML "LST STATSLDWIN".

Impact on the System

The services provided by the cell are disrupted. After the switchover, the baseband FH function and the services are restored.

System Actions

After the alarm is reported, the baseband FH function of the cell is restored and the cell is initialized.

Possible Causes

The faults of the TRXs that participate in baseband FH are rectified. The baseband FH function of the cell is restored.
The faults of the TRX carrying the BCCH are rectified. A switchover after the BCCH mutual aid occurs.
The TRXs that participate in baseband FH are manually unblocked.

Procedure

In the alarm system of BSC6000 LMT, check whether the alarm 402 Switchback after BCCH Mutual Aid in a Cell is reported before this alarm is reported.
Y => The alarm is caused by the switchover after the BCCH mutual aid. Refer to the handling suggestions of 402 Switchback after BCCH Mutual Aid in a Cell.

N => The faults of the TRXs that participate in baseband FH are rectified. All the TRXs that participate in baseband FH are functional. Go to 2.
On the BSC6000 LMT, check whether the FH attribute of the cell is baseband FH and the status of each TRX is normal.
Y => The switchback succeeds. The alarm handling is complete.

N => The switchback fails. Go to 3.
Wait for 15 minutes. In the alarm system of the BSC6000 LMT, check whether the alarm 403 Baseband FH Mutual Aid in a Cell is reported.
Y => Refer to the handling suggestions of403 Baseband FH Mutual Aid in a Cell. The mutual aid and the switchback show that the performance of TRXs are unstable. Please contactHuawei Customer Service Center to Replace the faulty TRX.

N => Please contactHuawei Customer Service Center to Replace the faulty TRX.