Diagnostics and Fault Handling
27 Diagnostics and Fault Handling
"Diagnostics and Fault Handling" supervises the handling of faults and
disturbances detected by the "Self Test and Supervision" function.
Fault handling performs the following:
• Filters spurious disturbances. (Disturbances are events which may
indicate a fault only under certain circumstances)
• Evaluates the underlying fault cause
• Determines the impact of a fault
• Localises faults to an offending RU
• Attempts to minimise the effect of a fault
• Reports any change in fault status of an MO to the BSC
• Maintains logs of faults
27.1 Concepts
Disturbance An event which may indicate a fault only
under certain circumstances
Managed Object The BSC manages the O&M of the RBS
via the A-bis O&M Interface. The RBS
equipment is seen as MOs by the BSC.
This is a means of describing the RBS in
a functional-oriented way, and a logical
model of the RBS in terms of MOs is
built in the BSC. All O&M actions are
based on this logical model structure
created in the BSC.
An MO does not necessarily have a one-
to-one relation with a physical unit in the
RBS, and the MO comprises either both
hardware and software or software only.
RU The smallest unit that can be handled on
site or in a repair center. Information
about the RU can be retrieved via OMT or
BSC.
27.2 Functions
27.2.1 Fault Detection
Detected disturbances are processed by filtering, evaluation and
classification.
The types of faults that are detected are specified in chapter Self Test
and Supervision.
EN/LZT 123 2697 R5A
1998-08-13
165 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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