EP0976274A1 - Improvements in, or relating to, measurement of telecommunications connection quality - Google Patents
Improvements in, or relating to, measurement of telecommunications connection qualityInfo
- 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- Withdrawn
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)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602862 | 1996-07-25 | ||
SE9602862A SE517413C2 (sv) | 1996-07-25 | 1996-07-25 | Förbättringar av, eller som hänför sig till, mätning av telekommunikationsförbindelsers kvalitet |
PCT/SE1997/001042 WO1998005179A1 (en) | 1996-07-25 | 1997-06-13 | Improvements in, or relating to, measurement of telecommunications connection quality |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0976274A1 true EP0976274A1 (en) | 2000-02-02 |
Family
ID=20403470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97928584A Withdrawn EP0976274A1 (en) | 1996-07-25 | 1997-06-13 | Improvements in, or relating to, measurement of telecommunications connection quality |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0976274A1 (no) |
NO (1) | NO990205L (no) |
SE (1) | SE517413C2 (no) |
WO (1) | WO1998005179A1 (no) |
Families Citing this family (2)
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)
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 |
-
1996
- 1996-07-25 SE SE9602862A patent/SE517413C2/sv not_active IP Right Cessation
-
1997
- 1997-06-13 WO PCT/SE1997/001042 patent/WO1998005179A1/en not_active Application Discontinuation
- 1997-06-13 EP EP97928584A patent/EP0976274A1/en not_active Withdrawn
-
1999
- 1999-01-18 NO NO990205A patent/NO990205L/no not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9805179A1 * |
Also Published As
Publication number | Publication date |
---|---|
NO990205L (no) | 1999-03-23 |
NO990205D0 (no) | 1999-01-18 |
SE517413C2 (sv) | 2002-06-04 |
SE9602862L (sv) | 1998-01-26 |
SE9602862D0 (sv) | 1996-07-25 |
WO1998005179A1 (en) | 1998-02-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19990225 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE DK FI FR GB LI NL SE |
|
17Q | First examination report despatched |
Effective date: 20040206 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20040727 |