Function Change
22 Function Change
The purpose of "Function Change" is to facilitate the reload, change or
upgrade of the RBS software and the subsequent activation of that
software. The software is downloaded from the BSC to the RBS via the
A-bis interface.
Function change incorporates the following features:
• Rapid initial start
− Software preloaded in the non-volatile memory of the
RBS during manufacture; permits rapid initial start.
• Rapid restart
− At restart of an RBS following a power failure, the
software does not have to be downloaded via the A-bis
interface to the RBS. This is because of the non-volatile
memory of the RBS.
• Minimised software download time
− Software is distributed internally within the RBS. Only
one copy of the software is downloaded to each RBS,
minimising the time required for software download.
• Software download while in traffic
− The RBS can perform download of software without
affecting normal operation. Traffic is affected only when
switching over to the downloaded software.
22.1 Concepts
CMRU Central Main RU. Subclass of Main RU.
An RBS has only one CMRU.
DMRU Distributed Main RU. Subclass of Main
RU. A DMRU is subordinate to the
CMRU.
File Package A set of individual software files which
together constitute a revision of the
software required by an entire RBS or by
parts of the RBS.
File Revision The file revision identifies a specific
software file. This includes the type of
Main RU the software is intended for
execution on as well as the software
revision.
Main RU Contains one or more processors to which
software can be downloaded from the
BSC. A Main RU is either central or
distributed, see above. A Main RU may,
EN/LZT 123 2697 R5A
1998-08-13
143 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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