Browse Prior Art Database

DYNAMIC COLLECTION OF MEASUREMENT REPORTS BY TRAFFIC CHANNEL STEALING IN GSM SYSTEMS

IP.com Disclosure Number: IPCOM000008987D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-29
Document File: 4 page(s) / 161K

Publishing Venue

Motorola

Related People

Daniel Paúl del Valle: AUTHOR

Abstract

In a GSM cellular system, and generally in any cellular system, the operator has to carry an essen- tial task of optimizing the system which is an ongo- ing need for the life of the system operation. Optimization is normally understood as the tuning of the radio interface in order to offer the sub- scribers the best quality. Optimization is normally benchmarked against some performance parameters of the system: drop call rate, call establishment suc- cess rate, subjective quality, bit error rate measure- ments, etc. The operator normally gets the data he needs to optimize a cellular system in a variety of forms: drive testing the system, statistics provided by the system, subscriber surveys/complaints, etc. From this data, the operator determines the actions needed: tuning of radio database parameters, anten- na modifications, new sites needed, etc.

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Technical Developments

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DYNAMIC COLLECTION OF MEASUREMENT REPORTS BY TRAFFIC CHANNEL STEALING IN GSM SYSTEMS

by Daniel Palil del Valle

INTRODUCTION

  In a GSM cellular system, and generally in any cellular system, the operator has to carry an essen- tial task of optimizing the system which is an ongo- ing need for the life of the system operation. Optimization is normally understood as the tuning of the radio interface in order to offer the sub- scribers the best quality. Optimization is normally benchmarked against some performance parameters of the system: drop call rate, call establishment suc- cess rate, subjective quality, bit error rate measure- ments, etc. The operator normally gets the data he needs to optimize a cellular system in a variety of forms: drive testing the system, statistics provided by the system, subscriber surveys/complaints, etc. From this data, the operator determines the actions needed: tuning of radio database parameters, anten- na modifications, new sites needed, etc.

  The most common method of determining the quality of the system is drive testing using special test mobiles which provide comprehensive data. This is a cumbersome task as it is very resource con- suming and it is impossible to drive/walk test all the area covered by a cellular system. Currently, a more comprehensive way of obtaining data for optimiza- tion is being envisaged: get that data from the real subscribers.

  The real subscribers actually provide signal level and quality measurements to the GSM cellular system. This data is so called downlink radio mea- surements. On the other hand, the BTS (Base Transceiver Station) measures the signal level and quality received in the radio uplink direction. Uplink and downlink measurements (generally termed MR data also) can be processed in the BTS or BSC (Base Station Controller) for the purpose of handover decisions, power control decisions, etc. Both possibilities are depicted below.

Upli$ Measurement data

~ -2 Ivl;vlentdata BA

Downlii Measurement data

1 Measurement Data Processed at the BTS

0 Matorob. Inc. 1999 129 January 1999

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MOTOROLA Technical Developments

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Uplii Measurement data

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  In order to automate the radio optimization, the measurement data which is available at the BSS (BSC or BTS) should be sent to a central location for processing with the objective of optimizing the cellular radio subsystem. The method to transfer the measurement data to a central location should be cost effective and should not demand extra trans- mission capacity. The proposed method dynamical- ly routes measurement reports provided by the BTS and/or mobiles in the network to a central location where they are processed. This method is based on temporarily configuring existing channels in the BSC-BTS, BSC-RXCDR (Remote Transcoding Unit in a GSM cellular system) interfaces for the

purpose of carrying measurement data. The mea- suremen...