tailieunhanh - GSM and UMTS (P18)

What is O&M? Operation and Maintenance (O&M) of telecommunications networks comprises the following functions: Alarm handling and fault management: Indications of malfunctions or outages of any network component are transferred back to the O&M system. The O&M technician can then remotely interact with the network component in question and try to repair the problem. Configuration management: Parameters necessary for network configuration such as frequency plans, next-neighbour relationships or handover algorithms are sent from the O&M centre to all network elements | GSM and UMTS The Creation of Global Mobile Communication Edited by Friedhelm Hillebrand Copyright 2001 John Wiley Sons Ltd ISBNs 0-470-84322-5 Hardback 0-470-845546 Electronic Chapter 18 Operation and Maintenance O M Gisela Hertel1 What is O M Operation and Maintenance O M of telecommunications networks comprises the following functions Alarm handling and fault management Indications of malfunctions or outages of any network component are transferred back to the O M system. The O M technician can then remotely interact with the network component in question and try to repair the problem. Configuration management Parameters necessary for network configuration such as frequency plans next-neighbour relationships or handover algorithms are sent from the O M centre to all network elements. Configuration management also includes downloading of new software into the network and tracking software versions of all network elements. Performance management All network elements generate a large variety of statistical and performance data. These data need to be collected by the O M centre for further processing and analysis. Security management This includes the handling of normal network security measures such as access control or system logs but also the administration of GSM specific security functions like authentication algorithms. Subscriber and equipment tracing In the case of stolen equipment or subscribers engaged in criminal activities tracing of the affected handsets or SIMs has to be feasible throughout the network. Subscriber and equipment administration Subscribers have to be activated or deactivated in the HLR and their service profiles have to be downloaded and updated. Similarly the EIR databases have to be administrated by the O M centre. Charging administration After each call data such as calling or called number or time stamps are recorded by the Mobile-Services Switching Centre MSC and later sent to the billing system. In the case of some services .