WO2004082254A1 - Ensemble reseau et serveur de transcodage pour reseaux de communication - Google Patents

Ensemble reseau et serveur de transcodage pour reseaux de communication Download PDF

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Publication number
WO2004082254A1
WO2004082254A1 PCT/DE2003/000829 DE0300829W WO2004082254A1 WO 2004082254 A1 WO2004082254 A1 WO 2004082254A1 DE 0300829 W DE0300829 W DE 0300829W WO 2004082254 A1 WO2004082254 A1 WO 2004082254A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication network
coding method
network
transcoding server
signals
Prior art date
Application number
PCT/DE2003/000829
Other languages
German (de)
English (en)
Inventor
Bernd Grossmann
Thomas Theimer
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE2003/000829 priority Critical patent/WO2004082254A1/fr
Publication of WO2004082254A1 publication Critical patent/WO2004082254A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols

Definitions

  • the convergence of voice and data networks is based on the transmission of digital voice signals in the form of packets.
  • Digital speech signals are adapted to this form of transmission using various coding methods, so-called codecs (coders / decoders).
  • codecs coders / decoders
  • Data compression is also often carried out in order to reduce the transmission capacity required for transmission.
  • Such codecs are specified, for example, by the International Telecommunication Union ITU in the following standards: G.711 (uncompressed pulse code modulation PCM), G.726 (adaptive differential PCM), G.723.1 (multipulse maximum likelihood quantization MP-MLQ) as well as Algebraic Code Excited Linear Prediction ACELP) and G.729 (Conjugate Structure Algebraic Code Excited Linear Prediction CS-ACELP). These codecs are mainly used in fixed networks.
  • codecs include codecs for mobile applications.
  • the GSM codecs Fill Rate FR, Enhanced Fill Rate EFR and Adaptive Multi-Rate AMR specified by the GSM Certification Forum are of particular importance.
  • the individual codecs differ not only in the bandwidth required for the transmission, but also in the speech quality that can be achieved and in their ability to transmit fax signals and modem signals transparently. Furthermore, the codecs differ in terms of complexity and computing requirements, with the complexity generally increasing the cost of an implementation.
  • DSPs digital signal processors
  • dedicated hardware such as ASICs.
  • the task ultimately to be mastered by the network includes consists in transmitting voice between participants, in a real network environment different codecs are used simultaneously to exchange digitized and possibly compressed voice packets.
  • Network operators require that all participants network-wide can communicate with each other. This in turn requires that interworking is possible among all applications and end devices existing in the network.
  • Endpoint license costs for all required codecs include G.723.1 and G.729.
  • the communication network which comprises at least one subnet N transporting user data, the user data transporting
  • Subnet N is formed from nodes, endpoints AI, A2, E3 and connections NV1, NV2, NV3, accordingly a first endpoint AI communicates with the communication network by means of a first coding method and accordingly a second endpoint A2 by means of a second coding method with the Communication network communicates, characterized in that at least one transcoding server T is provided for converting signals according to the first coding method into signals according to the second coding method and vice versa.
  • the invention further relates to a transcoder node or transcoding server T, which has means for converting signals according to the first coding method into signals according to the second coding method and vice versa.
  • Network-wide communication with all other endpoints is advantageously not impaired, since the transcoding server is switched on if necessary in every connection which exists or is being set up between endpoints which work with incompatible codecs.
  • the number of complex codecs required for interworking in a network only grows in proportion to the number of endpoints in which these complex and compressing codecs are required, for example, for optimal use of the transmission channel.
  • New codecs can be introduced more easily since the change only affects the central server and the endpoints working with the new codecs, but not all endpoints need to be adapted.
  • the present invention is transparent to the terminals or participants involved, i.e. it works with any existing device.
  • the single figure shows a network arrangement of a communication network with three terminals E1, E2, E3.
  • the first and the second terminal E1, E2 are connected to a first and a second end point AI, A2.
  • the first and the second terminal can each be conventional analog telephones or ISDN telephones.
  • the first and the second end point AI, A2 are, for example, access gateways.
  • the third terminal E3 is a terminal with an integrated codec, for example a SIP telephone. No separate access gateway is required for such a device.
  • network elements such as mediating network elements, network elements for user authentication and access control, network elements for charging, etc. have been dispensed with.
  • the three end points AI, A2, E3 mentioned are connected directly (or indirectly by means of the network elements, not shown) to a transcoding server or transcoder node T.
  • the connection between the first end point AI and the transcoding server T is designated NV1
  • the connection between the second end point A2 and the transcoding server T is NV2
  • the connection between the third end point E3 and the transcoding server T is NV3.
  • a connection NV4 between the first and the second end point is also shown by way of example.
  • connections are not fixed, as in circuit switching networks, but are provided accordingly if necessary by the underlying packet-oriented transmission network.
  • the representation of the connections is purely schematic and only captures a snapshot of the communication network.
  • the endpoints and nodes mentioned are to be assigned to the subnet N for the transmission of useful data.
  • the endpoints and nodes are controlled by means of a further subnet, the signaling network.
  • the simplest case is shown in the figure, in which the signaling subnet consists of only one control element S. This is representative of all network elements required for the control of the user data subnetwork.
  • Signaling connections S1..S4 transmit the necessary control information or signaling information between the end points AI, A2, E3 and the nodes and the transcoding servers T (shown in dashed lines).
  • the transcoding server T can be integrated in a conventional switching node or can be associated with it. It is also possible to implement transcoding servers in the form of independent network elements.
  • the invention advantageously achieves the goal of reducing the costs for the access gateways AI, A2.
  • This is achieved through a hardware implementation of the codecs in the access gateways AI, A2.
  • Central transcoding servers take over for interworking with other subscribers, for example SIP subscriber E3, or other networks, for example a mobile radio network (not shown), in which the simple codecs of the access gateways AI, A2 cannot be supported T the implementation of the codecs that are used in a connection if the codecs are not compatible.
  • the functionality of the transcoding server includes, as mentioned, the conversion between different codecs. Examples include: G.711 ⁇ -> G.723, G.711 ⁇ -> G.729, G.726 ⁇ -> G.723, G.726 ⁇ -> G.729.
  • a connection between a SIP terminal E3 and a first ISDN terminal E1 is considered below.
  • the ISDN terminal El is connected to the end point AI, here an access gateway.
  • the Access Gateway AI takes over the coding of the signals received and sent by ISDN from the first terminal El.
  • the SIP terminal E3 is also an end point.
  • the codec G.711 is used for the first user data connection NV1
  • the codec G.723 is used for the third user data connection NV3.
  • each connection between two terminals with regard to the codecs is broken down into at least two sections: a first section, here NV1, between the first end point AI and the transcoding server T, and a second section, here NV3, between the transcoding server and the third End point E3. Both connection sections can use any codecs independently of one another.
  • the transcoding server takes care of the corresponding implementation between the codecs.
  • the runtime between the endpoints / end devices essentially depends on the arrangement of the transcoding server. If the transcoding server is not on the direct path between the endpoints, the runtime can increase somewhat. However, this is an increase of a few milliseconds. This increase is insignificant in comparison with the already long runtimes for complex compressing codecs (90-140 milliseconds), which are caused by the complex computing operations.
  • negative effects of the centralized arrangement of the transcoding servers can be kept very low.
  • the signal transit time caused by the coding / decoding process will advantageously decrease by the transcoding servers according to the invention, since in the few central transcoding servers very powerful and therefore fast converters can be implemented with comparatively low cost, the implementation of which would not be economical for each individual end point.
  • connections that do not require codec conversion for example connections between two conventional telephones E1, E2, which are connected to the network via endpoints AI, A2, it is not necessary to route the connection via the transcoding server. In such a case, the communication between the end points AI, A2 can take place directly, represented by the direct connection NV4.
  • the detection of whether identical or compatible codecs are present can be carried out by a process when the connection is signaled, or in the transcoding server, which in such a case can switch the connection through unprocessed.
  • control element S controlling the transcoding server T will not necessarily also control the other nodes AI, A2 directly.
  • control elements AI A2 directly.
  • three different control elements can also be present (not shown).
  • a first control element controls endpoints AI and A2
  • a second control element controls endpoint E3
  • a third control element controls the transcoding server T.
  • transcoding server and the associated third control element are only included in a connection if transcoding should be necessary. Since this can only be determined in the course of the signaling, it is possible to proceed in several steps, for example: and only in case of codec incompatibility setup via the transcoding server T.
  • the transcoding server T is also used for network separation and thereby fulfills the function corresponding to an application-level firewall in data networks.
  • This exemplary embodiment is a possible application for the fact that it is only detected in the transcoding server whether a codec conversion is required.
  • the transcoding server T is used for network separation between two different networks - not shown.
  • the first network could be a closed and secured network and the second network an open, unsecured data network such as the Internet. Connections between the two networks can then always be routed via the transcoding server, even if no codec conversion is required for some connections.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)

Abstract

Des signaux vocaux numériques interviennent souvent dans des réseaux de communication, lesquels signaux sont codés au moyen de différents procédés de codage et éventuellement comprimés. Pour permettre la communication entre des points terminaux fonctionnant avec différents procédés de codage, il faut s'assurer qu'au moins un procédé de codage commun puisse être trouvé pour chaque situation de communication possible. Des solutions connues prévoient la mise en oeuvre de tous les procédés de codage usuels dans tous les terminaux. Toutefois, cette mesure augmente considérablement le coût total. La présente invention concerne donc un nouveau type d'ensemble réseau pour un réseau de communication. Ce réseau de communication, qui comporte au moins un sous-réseau (N) véhiculant des données utiles, lequel sous-réseau (N) véhiculant des données utiles est constitué de noeuds, de points terminaux (A1, A2, E3) et de liaisons (NV1, NV2, NV3), un premier point terminal (A1) communiquant avec le réseau de communication au moyen d'un premier procédé de codage et un deuxième point terminal (A2) communiquant avec ce réseau de communication au moyen d'un deuxième procédé de codage, se caractérise en ce qu'au moins un serveur de transcodage (T) est prévu pour convertir des signaux selon le premier procédé de codage en signaux selon le deuxième procédé de codage et inversement.
PCT/DE2003/000829 2003-03-14 2003-03-14 Ensemble reseau et serveur de transcodage pour reseaux de communication WO2004082254A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE2003/000829 WO2004082254A1 (fr) 2003-03-14 2003-03-14 Ensemble reseau et serveur de transcodage pour reseaux de communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2003/000829 WO2004082254A1 (fr) 2003-03-14 2003-03-14 Ensemble reseau et serveur de transcodage pour reseaux de communication

Publications (1)

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WO2004082254A1 true WO2004082254A1 (fr) 2004-09-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007003483A1 (fr) 2005-07-04 2007-01-11 Siemens Enterprise Communications Gmbh & Co. Kg Procede, dispositif serveur et dispositif de conversion pour l'etablissement d'une liaison de donnees utiles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001005109A1 (fr) * 1999-07-12 2001-01-18 Telefonaktiebolaget Lm Ericsson Procede et systeme d'echange d'informations entre des noeuds d'un reseau multimedia
US20030028643A1 (en) * 2001-03-13 2003-02-06 Dilithium Networks, Inc. Method and apparatus for transcoding video and speech signals
US20030048795A1 (en) * 2001-09-13 2003-03-13 Alcatel Gateway between digital signal transmission networks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001005109A1 (fr) * 1999-07-12 2001-01-18 Telefonaktiebolaget Lm Ericsson Procede et systeme d'echange d'informations entre des noeuds d'un reseau multimedia
US20030028643A1 (en) * 2001-03-13 2003-02-06 Dilithium Networks, Inc. Method and apparatus for transcoding video and speech signals
US20030048795A1 (en) * 2001-09-13 2003-03-13 Alcatel Gateway between digital signal transmission networks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007003483A1 (fr) 2005-07-04 2007-01-11 Siemens Enterprise Communications Gmbh & Co. Kg Procede, dispositif serveur et dispositif de conversion pour l'etablissement d'une liaison de donnees utiles
US8509219B2 (en) 2005-07-04 2013-08-13 Siemens Enterprise Communications Gmbh & Co. Kg Method, server device and converting device for setting up a payload-data connection
CN101258723B (zh) * 2005-07-04 2014-12-17 西门子企业通讯有限责任两合公司 用于建立有用数据连接的方法、服务器装置和转换装置

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