WO1997029602A1 - Codage integre de la parole - Google Patents

Codage integre de la parole Download PDF

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Publication number
WO1997029602A1
WO1997029602A1 PCT/FI1997/000060 FI9700060W WO9729602A1 WO 1997029602 A1 WO1997029602 A1 WO 1997029602A1 FI 9700060 W FI9700060 W FI 9700060W WO 9729602 A1 WO9729602 A1 WO 9729602A1
Authority
WO
WIPO (PCT)
Prior art keywords
functions
processing
isp
mobile communication
communication system
Prior art date
Application number
PCT/FI1997/000060
Other languages
English (en)
Inventor
Mikko Olkkonen
Original Assignee
Nokia Telecommunications Oy
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 Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Priority to EP97902374A priority Critical patent/EP0878105A1/fr
Priority to AU16037/97A priority patent/AU1603797A/en
Publication of WO1997029602A1 publication Critical patent/WO1997029602A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the invention relates to an arrangement according to the preamble of claim 1 for integrating the functions of mobile communication systems
  • FIG. 1 shows, from the point of view of the invention, the essential parts of a cellular mobile communication system
  • MS Mobile stations
  • BSC base station controllers
  • TC transcoders
  • MSC mobile switching centers
  • BSS base station subsystem
  • A-interface The part of the mobile communication system at the MSC side of the A-interface is referred to as a network subsystem (NSS)
  • the mobile switching center MSC handles the connecting of incoming and outgoing calls It performs functions similar to those of an exchange of a public switched telephone network (PSTN) In addition to these, it also performs functions characteristic of mobile communications only, such as subscriber location management, jointly with the subscriber registers of the network
  • PSTN public switched telephone network
  • Echo cancellers prevent an echo returning from the PSTN from reaching a mobile subscriber
  • the echo cancellers are usually placed in connecting lines between the mobile switching centers
  • the transcoders TC convert speech from a digital format to another Traffic between the center and the transcoder TC may be e g PCM data encoded in the form of 64 kbit/s A-law Alternatively encoding according to the u-law may be employed
  • the traffic between the transcoder TC and the base station controller BSC may be encoded speech of 13 kit/s Rate adaptation for the data is carried out between the rate of 64 kbit/s and the rates of 3.6; 6 or 12 kbit/s.
  • a soft handover (SH) with diversity combining (DC), i.e. macrodiversity, may be carried out e.g. as follows.
  • the signal is conveyed to the mobile station via several base stations BTS, and in the uplink direction, signals from the mobile station MS are received via several base stations BTS.
  • speech frames are combined e.g. by choosing, according to a particular criterion, the best of the speech frames received via the different routes. Suitable criteria to be used include SINR (Signal to Interference plus Noise Ratio) and bit error rate (BER).
  • SINR Signal to Interference plus Noise Ratio
  • BER bit error rate
  • the arrangement of the invention provides the advantage of a simpler structure over the prior art solution, which reduces costs and increases the reliability of the system
  • the invention is characterized by vertical integration, i.e integration of different functions
  • vertical integration i.e integration of different functions
  • integrated network elements either so that they are located at the same point, or alternatively as part of e g the base station controllers BSC
  • the terms to use side by side in association with the invention are vertical integration, i e integration of functions, and horizontal distribution
  • the integrated network element according to the invention is arranged to carry out processing steps associated with as many as possible of the functions. However, it may in some cases be justifiable to leave some of the functions, such as echo cancellation, to be performed by a separate unit and to combine the other functions into an integrated network element, which may be separate or part of e.g the base station controller BSC.
  • Figure 1 shows, from the point of view of the present invention tne essential parts of a mobile communication system
  • Figure 2 illustrates the preferred embodiment of the invention and an exemplary structure of the integrated speech encoding unit according to the invention.
  • FIG 3 is a flow chart representation of how the exemDlary integrated speech encoding unit works
  • transcoding TC, echo cancellation EC, soft handover SH and/or macrodiversity DC are integrated in a network element referred to as an Integrated Speech Processing (ISP) block.
  • the I/O (Input/Output) block comprises all the interfaces to the uplink and downlink transmission paths, including multiplexers and demultiplexers, which are not shown.
  • the I/O block may be of prior art technology.
  • the functions according to the invention may be implemented by e.g. digital signal processors DSP, which are connected to a memory MEM via a bus BUS.
  • the bus BUS is advantageously a parallel bus. To obtain horizontal distribution, i.e.
  • the same memory MEM may also contain speech Frame Processing Unit (FPU) which may, depending on the hardware provider's architecture, be constructed using wired logic or a digital processor with suitable software.
  • Support (SUP) circuits comprise all the support circuits that are essential to the operation of the processors, such as clocks, interrupts, power supply, etc.
  • a speech processing unit SPU consists of the signal processor DSP and its software stored in the memory MEM.
  • a processing block ISP carries out tasks that according to prior art are comprised by the functions TC, EC, SH and DC.
  • the basic task of the transcoding TC is to convert speech samples between formats encoded according to e.g. A-law and those encoded in some other manner.
  • Echo cancellation EC may take place e.g. as follows.
  • a speech sample is encoded in the form of A-law; speech thus encoded is transmitted to the MSC; in addition, the encoded speech is stored in the memory MEM from which the speech processing unit SPU may retrieve it when needed, when the same speech sample comes back to the transcoder TC from the direction of the MSC, the speech processing unit SPU retrieves the sample corresponding to the speech frame in question from the memory MEM.
  • the speech processing unit SPU consists e g of a digital signal processor DSP with its peripheral devices
  • the memory MEM comprises at least Random Access Memory (RAM), but for storing software it may also contain Read Only Memory (ROM) and/or flash memory, a hard disk etc
  • the processing block ISP has at its disposal several samples that have arrived along alternative paths In an urban area, where the highest interference levels are met, the number of base stations audible simultaneously is also normally higher than outside of towns According to prior art, the best of the speech frames is chosen by a specific criterion.
  • the invention provides the alternative that also parts of several frames may be combined, which results in that a frame will be obtained which is better than any single frame By combining several frames it is hence possible to form a signal with a quality better than that of a signal which could have been formed from just one input signal
  • Figure 3 shows exemplary processing steps when diversity combining DC and echo cancellation EC are being earned out in the circuit according to Figure 2
  • an index i refers to successive samples of speech frames and N refers to parallel diversity branches
  • the reference mark P refers to a counter by means of which it is ascertained that all the diversity branches will be examined
  • An index j and the stored samples EC are related to echo cancellation
  • samples are formed from speech signals 1... N
  • steps 304-1 ..304-N the samples are stored in the memory into addresses 1 N
  • steps 306 - 308 it is determined whether all the parallel processes have been examined, and if that is the case, the samples will be processed by signal processors DSP at step 310
  • the process starts anew with the next sample
  • a possible implementation for the processing step 310 is described as steps 320 - 336
  • the sample 1 N stored at step 304, is read out from the memory 1 N
  • result information is formed e g so that the frame processing units FPU of the processing block ISP receive corresponding samples of speech frames and store them in the memory MEM
  • the speech processing unit SPU forms from the samples stored in the memory MEM, a signal according to A-law (or correspondingly u-law)
  • the echo information EC is stored in the memory and the signal is transmitted to the connecting hne
  • echo cancellation is carried out by a suitable

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'état antérieur de la technique concernant des systèmes de communication mobiles, un signal vocal est traité et converti d'un format à un autre et ce, en plusieurs points du système. Au nombre de ces conversions figurent l'annulation d'écho (EC), le transcodage (TC), et le transfert doux (SH) ainsi que la combinaison de diversité (DC). Ces dispositions aux fins du traitement de signal et de sa conversion d'un format à un autre en différents points du système, supposent, bien souvent, un traitement analogique. Cela soulève un sérieux problème en ce sens que la répétition du traitement analogique, en plusieurs points différents du système, ajoute à la complexité de celui-ci, fait s'élever les coûts et nuit à la fiabilité du système. Le fait d'exécuter séparément les étapes de traitement, s'il est le seul à permettre d'utiliser les résultats de chaque étape précédente, ne permet cependant pas d'utiliser avantageusement des résultats intermédiaires. Au titre de cette invention, on exécute, par contre, le plus d'étapes possibles de traitement d'un système de communication mobile au sein d'un élément intégré de réseau ((ISP - traitement intégré de la parole) pouvant lui-même constituer une unité séparée. Cette unité ISP peut également se situer, physiquement, dans un centre de communication radiomobile (MSC). Le traitement intégré a pour avantage d'offrir une structure simplifiée dans la mesure où il est possible d'exécuter toutes les étapes de traitement à l'aide de la même unité de traitement de signal (DSP). L'intégration réduit les coûts et renforce la fiabilité du système. Il est également possible de placer en parallèle les éléments intégrés de réseau (ISP) selon cette invention, soit en un même point du système, soit comme partie intégrante d'unités de contrôle de station de base (BSC).
PCT/FI1997/000060 1996-02-05 1997-02-04 Codage integre de la parole WO1997029602A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97902374A EP0878105A1 (fr) 1996-02-05 1997-02-04 Codage integre de la parole
AU16037/97A AU1603797A (en) 1996-02-05 1997-02-04 Intergrated speech encoding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI960522 1996-02-05
FI960522A FI102344B1 (fi) 1996-02-05 1996-02-05 Integroitu puheenkoodaus

Publications (1)

Publication Number Publication Date
WO1997029602A1 true WO1997029602A1 (fr) 1997-08-14

Family

ID=8545287

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000060 WO1997029602A1 (fr) 1996-02-05 1997-02-04 Codage integre de la parole

Country Status (4)

Country Link
EP (1) EP0878105A1 (fr)
AU (1) AU1603797A (fr)
FI (1) FI102344B1 (fr)
WO (1) WO1997029602A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998042155A2 (fr) * 1997-03-17 1998-09-24 Nokia Telecommunications Oy Procede de combinaison de signaux et recepteur correspondant
WO1999016270A1 (fr) * 1997-09-26 1999-04-01 Alcatel Usa Sourcing Lp Systeme de telecommunications integre
WO1999021387A2 (fr) * 1997-10-22 1999-04-29 Nokia Networks Oy Reception en diversite dans un systeme mobile de telecommunications
EP1134935A2 (fr) * 2000-03-17 2001-09-19 Symbol Technologies, Inc. Réseau local sans fil avec plusieurs portes RF
US7173923B2 (en) 2000-03-17 2007-02-06 Symbol Technologies, Inc. Security in multiple wireless local area networks
US8687610B2 (en) 1998-01-16 2014-04-01 Symbol Technologies, Inc. Infrastructure for wireless LANS

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4841437A (en) * 1985-09-18 1989-06-20 Lp Com System architecture for a test apparatus having primary and dependent processors
EP0544532A2 (fr) * 1991-11-26 1993-06-02 Fujitsu Limited Ordinateur parallèle et sa méthode de communication de tous vers tous
US5475689A (en) * 1990-12-06 1995-12-12 Hughes Aircraft Company Cellular telephone with datagram and dispatch operation
WO1995035636A1 (fr) * 1994-06-22 1995-12-28 Gte Laboratories Incorporated Systeme de reperage se basant sur un reseau cellulaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4841437A (en) * 1985-09-18 1989-06-20 Lp Com System architecture for a test apparatus having primary and dependent processors
US5475689A (en) * 1990-12-06 1995-12-12 Hughes Aircraft Company Cellular telephone with datagram and dispatch operation
EP0544532A2 (fr) * 1991-11-26 1993-06-02 Fujitsu Limited Ordinateur parallèle et sa méthode de communication de tous vers tous
WO1995035636A1 (fr) * 1994-06-22 1995-12-28 Gte Laboratories Incorporated Systeme de reperage se basant sur un reseau cellulaire

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998042155A3 (fr) * 1997-03-17 1998-12-03 Nokia Telecommunications Oy Procede de combinaison de signaux et recepteur correspondant
WO1998042155A2 (fr) * 1997-03-17 1998-09-24 Nokia Telecommunications Oy Procede de combinaison de signaux et recepteur correspondant
WO1999016270A1 (fr) * 1997-09-26 1999-04-01 Alcatel Usa Sourcing Lp Systeme de telecommunications integre
EP1025737B2 (fr) † 1997-10-22 2011-10-05 Nokia Corporation Reception en diversite dans un systeme mobile de telecommunications
WO1999021387A2 (fr) * 1997-10-22 1999-04-29 Nokia Networks Oy Reception en diversite dans un systeme mobile de telecommunications
WO1999021387A3 (fr) * 1997-10-22 1999-06-24 Nokia Telecommunications Oy Reception en diversite dans un systeme mobile de telecommunications
US6757524B1 (en) 1997-10-22 2004-06-29 Nokia Corporation Diversity reception in a mobile communication system
US8687610B2 (en) 1998-01-16 2014-04-01 Symbol Technologies, Inc. Infrastructure for wireless LANS
EP1134935A3 (fr) * 2000-03-17 2004-02-11 Symbol Technologies, Inc. Réseau local sans fil avec plusieurs portes RF
EP2009847A3 (fr) * 2000-03-17 2011-07-13 Symbol Technologies, Inc. Réseau local sans fil avec plusieurs portes RF
US8027320B2 (en) 2000-03-17 2011-09-27 Symbol Technologies, Inc. Wireless local area networks
US7173923B2 (en) 2000-03-17 2007-02-06 Symbol Technologies, Inc. Security in multiple wireless local area networks
EP1134935A2 (fr) * 2000-03-17 2001-09-19 Symbol Technologies, Inc. Réseau local sans fil avec plusieurs portes RF

Also Published As

Publication number Publication date
FI102344B (fi) 1998-11-13
FI960522A (fi) 1997-08-06
FI102344B1 (fi) 1998-11-13
EP0878105A1 (fr) 1998-11-18
FI960522A0 (fi) 1996-02-05
AU1603797A (en) 1997-08-28

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