EP0976274A1 - Ameliorations concernant la mesure de la qualite d'un branchement de telecommunications - Google Patents

Ameliorations concernant la mesure de la qualite d'un branchement de telecommunications

Info

Publication number
EP0976274A1
EP0976274A1 EP97928584A EP97928584A EP0976274A1 EP 0976274 A1 EP0976274 A1 EP 0976274A1 EP 97928584 A EP97928584 A EP 97928584A EP 97928584 A EP97928584 A EP 97928584A EP 0976274 A1 EP0976274 A1 EP 0976274A1
Authority
EP
European Patent Office
Prior art keywords
mobile
measurement
measurement station
fixed measurement
mobile handset
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97928584A
Other languages
German (de)
English (en)
Inventor
Erik Bryntse
Ulf Sandberg
Thomas NÖJD
Birgitte Rodger
Bengt Serenius
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telia AB
Original Assignee
Telia AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telia AB filed Critical Telia AB
Publication of EP0976274A1 publication Critical patent/EP0976274A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Definitions

  • the present invention relates to a test set for, and a method of, measuring the quality of a connection, established over a mobile telecommunications network.
  • Preventative maintenance can be planned and is invariably cheaper than acute repair of faults.
  • the speech quality in a modern telecommunications network is harder to supervise than pure data transmission. Furthermore, the speech quality in a telecommunications network is, to a large extent, decided by the analog terminations in the network.
  • echo This is a network specific problem which can substantial degrade speech quality.
  • New network improvements have reduced the attenuation, not only of speech signals, but also of echo. This means that, in modern telecommunications networks, echo is, potentially, a greater problem than it was in older networks.
  • the subjective reaction to echo depends on the echo delay, i.e. the time between the original signal and the delayed signal. With very short delays the speech sounds “hollow”, which is a very unpleasant effect. The effects of echo are made worse by increased echo delay. Echo in a telephone system, therefore, is a phenomenon that needs to be minimised.
  • the local network In the local network, communication between a subscriber equipment, such as a telephone, and the local telephone exchange, takes place over a two-wire loop.
  • the connection is established via microwave, or satellite, links.
  • the connection is no longer a bidirectional two-wire loop, but two one-way channels, equivalent to two pairs of wires.
  • the device used for conversion from two to four wires is referred to as a hybrid. It is hybrids that are the principle cause echo.
  • the network is in operation.
  • connection is taken out of operation and measurements are performed by introducing signals which are known to behave well in the network. This enables such parameters as attenuation, echo, delay, error probability, etc., to be determined.
  • a method of measuring the quality of a mobile connection characterised by:
  • Said fixed measurement station may be connected to an ISDN.
  • said mobile handset is adapted for the transmission of predetermined test sequences.
  • Said received sound signals may be stored on a DAT recorder .
  • parameters influencing reception quality including signal strength, channel number, time slot, timing advance and base station identity, are recorded.
  • Said received sound signals may be stored on a portable computer equipped with a sound card.
  • Said fixed measurement station may include a PC equipped with a DSP card.
  • echo is simulated in said fixed measurement station by means of an impulse response generated by software on said DSP card.
  • Sound signals received by said fixed measurement station may be recorded on a hard disc.
  • Said mobile telephone system may be a GSM system and said mobile handset is a GSM handset.
  • a portable measurement briefcase for use with the method set forth above, characterised in that said measurement brief case includes a mobile handset modified for the transmission of predetermined test sequences.
  • Said measurement brief case may include a portable PC equipped with a sound card.
  • Said measurement brief case may include a DAT recorder adapted to record sound signals received by said modified mobile handset.
  • said mobile handset is equipped with a field test display adapted to record parameters affecting reception quality, including signal strength, channel number, time slot, timing advance and base station identity.
  • Said mobile handset may be a GSM handset.
  • a fixed measurement station for use with the method, as set forth above, characterised in that said fixed measurement station includes an ISDN- connected PC equipped with a DSP card.
  • Said ISDN-connected PC is arranged to simulate echo by a software generated impulse response.
  • Said ISDN-connected PC is arranged to store incoming sound signals on a hard disc.
  • the GSM-system offers subscribers the ability to make mobile calls originating from a large number of countries.
  • the system has restrictions and is still suffering from early developmental problems, not least due to the rapid extension of the system.
  • a number of tests with GSM calls between different countries in Europe have been performed.
  • the routes by which connections are established have been examined. The aim of this exercise is, firstly, to obtain an improved knowledge and understanding of how connection routes are established and, secondly, to make a rough investigation of any quality problems, related to complex connection routes, that occur.
  • the measurement briefcase includes a GSM-mobile handset.
  • the GSM mobile is used to call the fixed station, which is connected to an ISDN. Measurements can then be performed which, objectively and subjectively, give a measurement of speech quality.
  • the measurement system enables a better picture of the speech quality on international GSM connections to be obtained and this in turn enables a view of the factors which influence speech quality to be derived.
  • the measurement briefcase which is proposed by the present invention, is a tool for the systematic examination of the speech quality of international GSM calls.
  • the measurement briefcase can also be used to examine the speech quality in an operator's domestic network.
  • the measurement system is based on a portable measurement briefcase which can easily be transported, and a fixed measurement station located in an operator's domestic network.
  • the measurement briefcase includes, among other things, a GSM-mobile.
  • the GSM mobile is used to establish a mobile connection with the fixed measurement station by simply making a mobile call to the fixed measurement station.
  • the measurement briefcase includes a GSM mobile telephone, modified so that predetermined test sequences can be transmitted, at the same time as received sound signals are stored. This is achieved by means of a portable PC with sound-card, and possibly a DAT- recorder, or the like.
  • the telephone is equipped with a field test display, making it possible to read different parameters which may influence reception quality , for instance signal strength, channel number, time slot, timing advance, base station identity , etc.
  • the fixed station is based on an ISDN-connected PC with a DSP-card.
  • the reason for using an ISDN connection is that such connections are not subject to echo, because the ISDN uses a four wire connection right up to the subscriber. Echo, which is normally caused by hybrids, which convert from 2-wire to -wire in the local exchange, is instead simulated by an impulse response in software on the DSP (digital signal processing) card.
  • the incoming sound signals are saved on hard disk and predefined test sequences are transmitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

Procédé permettant de mesurer la qualité d'un branchement mobile dans un système de téléphone mobile et consistant en les étapes suivantes: établissement d'un branchement mobile entre un combiné mobile et une station fixe de mesure; transmission de séquences de contrôle prédéterminées depuis ledit combiné mobile vers ladite station fixe de mesure et vice versa; mémorisation de signaux sonores reçus par ledit combiné mobile et ladite station fixe de mesure; analyse desdits signaux sonores afin de calculer une mesure de la qualité dudit branchement mobile. Mallette portable de mesure servant à mettre ce procédé en application et comprenant un combiné mobile modifié pour la transmission de séquences de contrôle prédéterminées. Station fixe de mesure conçue pour être utilisée avec le procédé et comprenant un ordinateur portable branché sur RNIS et équipé d'une carte de traitement de signaux numériques (DSP).
EP97928584A 1996-07-25 1997-06-13 Ameliorations concernant la mesure de la qualite d'un branchement de telecommunications Withdrawn EP0976274A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9602862A SE517413C2 (sv) 1996-07-25 1996-07-25 Förbättringar av, eller som hänför sig till, mätning av telekommunikationsförbindelsers kvalitet
SE9602862 1996-07-25
PCT/SE1997/001042 WO1998005179A1 (fr) 1996-07-25 1997-06-13 Ameliorations concernant la mesure de la qualite d'un branchement de telecommunications

Publications (1)

Publication Number Publication Date
EP0976274A1 true EP0976274A1 (fr) 2000-02-02

Family

ID=20403470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97928584A Withdrawn EP0976274A1 (fr) 1996-07-25 1997-06-13 Ameliorations concernant la mesure de la qualite d'un branchement de telecommunications

Country Status (4)

Country Link
EP (1) EP0976274A1 (fr)
NO (1) NO990205L (fr)
SE (1) SE517413C2 (fr)
WO (1) WO1998005179A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6682791B2 (en) 2001-02-07 2004-01-27 Sonoco Development, Inc. Packages and methods for differential oxygen scavenging
DE102004008207B4 (de) * 2004-02-19 2006-01-05 Opticom Dipl.-Ing. Michael Keyhl Gmbh Verfahren und Vorrichtung zur Qualitätsbeurteilung eines Audiosignals und Vorrichtung und Verfahren zum Erhalten eines Qualitätsbeurteilungsergebnisses

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH686752A8 (de) * 1993-09-22 1996-08-15 Ascom Tech Ag Berner Technopark Verfahren zum Beurteilen der Übertragungsqualität einer Sprach-Übertragungsstrecke
FI106505B (fi) * 1993-09-27 2001-02-15 Nokia Networks Oy Langattoman tilaajaliittymän toteuttava radiojärjestelmä sekä tilaajalaite radiojärjestelmää varten
NO942031L (no) * 1994-06-01 1995-12-04 Ericsson As Creative Engineeri System for overvåkning av telefonnett og/eller datakommunikasjonsnett, spesielt mobiltelefonnett

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9805179A1 *

Also Published As

Publication number Publication date
SE517413C2 (sv) 2002-06-04
NO990205D0 (no) 1999-01-18
SE9602862L (sv) 1998-01-26
NO990205L (no) 1999-03-23
WO1998005179A1 (fr) 1998-02-05
SE9602862D0 (sv) 1996-07-25

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