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User Description, Radio Network StatisticsUSER DESCRIPTION

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IntroductionThe purpose of this user description is to present different methods to measurethe radio network performance and subscriber perceived quality. It contains abrief description of Statistics and Traffic Measurement Subsystem (STS) butfocuses on the evaluation of the statistics for both general and feature specific

performance in the radio part of Ericsson's GSM system. A brief description ofsome other performance measurement functions is also included. For moredetailed information regarding counter units etc. see Reference [1].

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CapabilitiesMonitoring of statistical measures is a very important part of the Operationand Maintenance (O&M) of a radio network. The radio network statistic andrecording functions can be used for: Monitoring and optimization of the radio network performance

Evaluation and optimization of the radio network features Dimensioning of the radio network Trouble shooting

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Measurement Tools for Radio NetworkPerformance3.1 General

There are several different measurement tools for monitoring and improvingthe radio network performance. They could roughly be categorized in thethree areas: monitoring and problem detection, help for implementation andsupport for troubleshooting. The monitoring tools are used for supervision andtrouble detection in the whole network and the implementation tools support theoperator at expansion or reallocation of resources, such as frequency planningor neighbor relation definitions. The troubleshooting tools could be used inspecific areas or cells where the performance is deteriorated. Some of the mostuseful tools are presented in this chapter.

Monitoring and Performance ToolsThe monitoring tools are used for monitoring the network performance but alsofor continuous supervision acting as a support for expansions, reallocations,problem detection and general improvement activities.STN The Site Transport Node (STN) is used on the BTSsite to terminate IP when using Packet Abis over IP. Inorder to monitor the STN there are several countersavailable which can be collected via an open interfaceor OSS for post-processing. For detailed information,please see Reference [41].

STS Statistics and Traffic Measurement Subsystem (STS) isimplemented in the BSC (and MSC). It gives statisticsabout events in different parts of the system such ascells and equipment. By continuously supervising theresults from STS the operator can obtain a very goodoverview of the radio network performance which canhelp to detect problems early. For further information,see Reference [1].

MRR Measurement Result Recording (MRR) collectsinformation from the measurement results sent bythe BTSs to the BSC. Information such as RXLEV,

RXQUAL etc. is included. The tool is for instance usedfor routine supervision or for checking specific cells.MRR is a part of the Radio Network Optimization (RNO)package in OSS, see Reference [28].

TEMS AutomaticTems Automatic is a tool within the TEMS productportfolio, where several special mobile stations areplaced in for instance taxis and buses. The set ofmobiles are supervised centrally and the measurementsare sent directly to this center. TEMS automaticprovides the operator with information about subscriber

perceived quality from many parts of the network.

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R-PMO The real-time performance monitor provides real-timestatistics in order to receive instant feedback ofperformance from sudden changes of the network,either by the network itself (e.g. hardware faults) or byoperator initiated changes (i.e. parameter, feature orfrequency changes). For operator initiated changes,faster tuning can be achieved. R-PMO also provides ahigh degree of detailed information, such as timestampson events, and flexibility, such as user defined reports.See Reference [31].

Implementation ToolsThe tools for implementation are used during expansions, tuning orimprovement activities and work as an assistant for the operator during theplanning. The previously mentioned tools STS and MRR are also useful within

this area.

NOX Neighboring Cell List Optimization Expert (NOX) is atool meant as a support for the operator for optimizationof the neighboring cell relations. This is done bycollecting and handling data from measurement reports,handover statistics and general network configurations.The outcome are suggestions to remove superfluousor add new neighboring cell relations. The user canset whether the changes should be implementedautomatically or require an approval by the user.SeeReference [29] .

FOX Frequency Optimization Expert (FOX) measures forpossible interferers in order to find suitable frequenciesto define in cells. FOX supplies the operator withsuggestions about frequencies at e.g. network/hardwareexpansions or frequency reallocations. See Reference[18] .

SYROX Synchronized Radio Network Optimization Expert(SYROX) is a tool intended to support the operatorwith planning of parameters that control the frequencyhopping for a group of Synchronized Cells in order tominimize the interference in the network. Apart fromthe fact that a group of mutually synchronized cells is

required, SYROX also requires that the optional BSSfeatures FAS (FOX recording mode), and Flexible MAIOManagement are available. For more information seeReference [33].NOX and FOX are included in the RNO package in OSS, and are based on therecording functions Frequency Allocation Support (FAS) and Neighboring CellSupport (NCS) respectively.

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3.4 Troubleshooting ToolsAfter detecting problems anywhere in the network, the troubleshooting toolscan be used specifically in the area concerned. While the monitoring covers thewhole area, these tools are more suitable for handling certain cells or relations.

TEMS InvestigationTEMS Investigation is a drive test tool within the TEMSproduct family. It consists of a TEMS mobile station, aPC with the TEMS Investigation software and a GPSreceiver. The uplink and downlink information on theair-interface is monitored and recorded together withthe positioning data from the GPS. TEMS Investigation,here referred to as TEMS, is a very powerful tool forfield measurements during troubleshooting in specificareas of the network.

MTR Mobile Traffic Recording (MTR) records the eventsand measurements on both the uplink and downlinkconnected to a certain subscription, which can be usefulwhen a subscriber complains and the cause is to beinvestigated. MTR is also very useful together withTEMS. From TEMS geographical information can beretrieved but not from MTR.

CER Channel Event Recording (CER) measures interferenceon the frequencies defined in the cell and is used whenthe performance of the channel allocation strategyis investigated. Idle Channel Measurement (ICM)or Differential Channel Allocation (DCA) is requiredfor this recording, see Reference [25]and Reference[14]respectively.

CTR Cell Traffic Recording (CTR) collects data aboutconnections in specific cells. Certain events can beused as triggers and all communication on up- anddownlink is recorded. CTR could be used if thereare specific problems found in any cell, such as anabnormal number of Traffic Channel (TCH) drops.For detailed information regarding CTR, MTR and CER, see Reference [6].