Software Reliability - Huawei Airbridge BTS3606A Technical Manual

Technical Manual
Airbridge BTS3606A CDMA Base Station
When an error occurs to a module, an alarm is generated and sent to the BAM. The
system also supports online insertion and removal of boards.

5.3 Software Reliability

The software reliability design involves the following aspects:
I. Periodic check of key resources
This function aims to check the software resource which has been occupied for a long
time. If certain resource becomes unavailable owing to software error, the check
mechanism will release that resource and output logs and alarms.
II. Proce ss monitoring
Process monitoring provides channel for outputting various software and hardware
faults while the software is running. It can monitor the running status of a specific task
or system, and report the information to the outside.
III. Data check
Data check consists of the following contents:
Check the data consistency of different processing boards, restore the data, and
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output logs and alarms.
Check the consistency of the data input by the user to ensure correct reference
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relation among data.
Use the rollback function to restore the data to the initial state when the
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modification of some data fails at a certain point.
IV. Fault isolation
In the BTS3606A, when a fault occurs to one software module, other software modules
can run normally.
The software also has the fault tolerance and correction functions. The minor operation
exceptions will not cause the reset or reboot of the system.
V. Reversible upgrade
The system provides such function as program and data restoration. When the
upgrade fails, the function helps restore to the original program and data configuration.
VI. Log function
The operation and maintenance software can automatically record user's operations
and save them into a log file.
When an unknown error occurs to the system, log files can help to find out the status in
the normal condition for fault location or data restoration.
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System Description
Chapter 5 Reliability Design