EP1457021A1 - Procede et dispositif pour transaction avec codage/decodage - Google Patents

Procede et dispositif pour transaction avec codage/decodage

Info

Publication number
EP1457021A1
EP1457021A1 EP02798271A EP02798271A EP1457021A1 EP 1457021 A1 EP1457021 A1 EP 1457021A1 EP 02798271 A EP02798271 A EP 02798271A EP 02798271 A EP02798271 A EP 02798271A EP 1457021 A1 EP1457021 A1 EP 1457021A1
Authority
EP
European Patent Office
Prior art keywords
codec
control device
gateway
list
codecs
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Withdrawn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
EP02798271A
Other languages
German (de)
English (en)
Inventor
Rita Leirich
Rüdiger KREUTER
Lothar Gesswein
Bernd Siegwart
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.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
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 AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1457021A1 publication Critical patent/EP1457021A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/104—Signalling gateways in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1023—Media gateways
    • H04L65/1026—Media gateways at the edge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1023—Media gateways
    • H04L65/103—Media gateways in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/1036—Signalling gateways at the edge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/762—Media network packet handling at the source 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • 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 invention relates to a method for codec negotiation for data transmission between two media gateways according to the preamble of claim 1 and an arrangement therefor.
  • the data is also compressed regularly according to defined algorithms.
  • a decompression algorithm is required that cancels the compression after transmission or storage. This means that a corresponding decompression belongs to each compression, which inverts exactly this compression.
  • the hardware and software solutions created for this are usually also referred to as codecs.
  • a data stream encoded or compressed with a certain codec can only be decoded or decompressed with this codec.
  • H.323 is a standard for audio, video and data communication over an IP-based network.
  • the H.323 protocol family includes, for example, the following codec standards: G.711, G.722, G.723, G.728 and G.729.
  • the G.711 standard offers uncompressed transmission, as is also used in music CD technology and in the ISDN network.
  • This standard is mandatory for all H.323 systems and in principle (ignoring possible packet delays) offers the best quality due to the slightest delay.
  • This method has a data rate of 56 kbit / s or 64 kbit / s and a bandwidth of 3.1 kHz. If more powerful signal processors are used for coding, the required bit rates can be pushed down to 5.3 kbit / s while the voice quality is still very good. However, this results in higher delays.
  • G.723 has the lowest bandwidth but a very high delay.
  • G.728 has a slight delay but still 16 kbit / s data rate.
  • G.729 has a medium delay and a data rate of 8 kbit / s.
  • codecs are, for example, MP3 (MPEG Layer III Audio) for the high-quality transmission of music data on the Internet, H.261 or H.263 for video conferences with low or medium quality or Sorensen Video for the high-quality video data transmission over IP networks.
  • MP3 MPEG Layer III Audio
  • H.261 or H.263 for video conferences with low or medium quality
  • Sorensen Video for the high-quality video data transmission over IP networks.
  • codecs are used to encode the data to reduce storage space requirements or to speed up data transmission.
  • VoIP IP network
  • a suitable codec must be set on both the sending side and the receiving side of the connection.
  • the media gateways on both sides of the IP network are controlled by the associated media gateway controller (MGC). controls.
  • MGCs negotiate the codec to be used when establishing a VoIP connection. Both MGCs each use an administratively specified codec list as the basis for negotiations. This codec list then becomes a codec. selected, which is not supported by both media gateways, the connection will be terminated.
  • the object of the present invention is therefore to provide an improved method for codec negotiation, which is faster on the one hand and on the other hand also successful in heterogeneous networks.
  • a suitable arrangement for carrying out the method is also to be provided.
  • An essential idea of the invention is that the media gateway controller not only a codec negotiation for one on the basis of the administratively specified codec list
  • the controller of the receiving gateway creates (second gateway controller) a list of the codecs which are contained both in the codec list sent by the controller of the sending gateway (first gateway controller) and in the active codec list of the second gateway controller. This list is also forwarded to the first gateway controller. Both controllers save this list for the duration of the connection. This provides both gateway controllers with a list of codecs that are supported by both media gateways involved in this connection.
  • active codecs are contained in the active codec list, which are both currently supported by the respective gateway and are also contained in the codec list given in the respective administration. This leads to a further increase in the performance of the negotiation.
  • This active list can therefore contain a smaller number of codecs because the media gateway also supports codecs that are not contained in the administratively specified codec list.
  • a further advantageous embodiment manages the active codec list in such a way that the codecs supported by the gateway are reported to the assigned gateway controller when a gateway is first registered in the network. Based on this message, the gateway controller can create the active codec list. The gateway controller is also informed of changes in the supported codecs, so that the active codec list always contains the current status of the applicable codecs.
  • the gateway controller periodically polls the gateway assigned to it in order to keep the active codec list up to date. Changes in the support of the codecs by the gateway are included in the active codec list in the next query.
  • a switch is made to a different codec during a connection. This codec is contained in the supplied emitted from the second gateway controller in the first controller G ATEWAY codec list. This codec is thus supported by both media gateways, and it is possible to switch to a codec with the currently most favorable transmission parameters during a connection or a data transmission.
  • the administratively prescribed codec list preferably contains at least the codecs which the H.323 standard has.
  • the administratively specified codec list thus has the codecs relevant for most VoIP connections.
  • a preferred embodiment of the arrangement according to the invention additionally has a further memory device on each side of a connection, in which the codec lists are stored for the duration of a connection, which contains those codecs that are in the two active codec lists and in the administrative predetermined codec lists are included.
  • This saved list contains, as it were, the intersection of all relevant codec lists, and one from this. Intersection of selected codec is supported by both sides of the connection.
  • a single physical memory is provided in the respective gateway controller, in which the various codec lists are stored. This simplifies the arrangement structure since only one memory chip is required.
  • Fig. 1 shows an arrangement for a conventional codec negotiation
  • Fig. 2 shows an arrangement for a codec negotiation according to the present invention.
  • the transmission network 11 and the connection network 12 are connected to one another via a media gateway 14.
  • the media gateway 14 is controlled by a gateway controller 15 assigned to it.
  • the controller 15 accesses a database 16 in which an administratively specified codec list is stored.
  • connection network 12 is connected to the reception network 13 via a further media gateway 17.
  • the media gateway 17 is controlled by a gateway controller 18, which in turn accesses a database 19.
  • An administratively predetermined codec list is stored in the database 19, which may be different from the codec list stored in the database 16.
  • the gateway controllers 15, 18 are connected to one another in order to carry out the codec negotiation with one another.
  • the two gateway controllers 15, 18 negotiate about the codec to be used.
  • the gateway controller 15 selects its preferred or prioritized codec type from the codec list that is stored in the database 16. He signals this type of codec with a Create-Con- nection message (CRCX) on the one hand to the gateway 14, which first sets this codec as the codec type to be used for the connection. Furthermore, the controller 15 notifies the controller 18 of the complete codec list from the database 16.
  • CRCX Create-Con- nection message
  • the controller 18 now selects a codec type from this received codec list by comparing the received codec list with its codec list stored in the database 19. He selects from the received codec list the codec that has the highest priority in his administratively specified list. It communicates this type of codec to the gateway 17 in a create connection message (CRCX).
  • CRCX create connection message
  • the controller 18 reports this to the gateway controller 15. If the gateway 17 does not accept the codec type selected by the controller 18, the controller 18 searches for a further codec type and shares it this newly selected type with the Gateway 17. This is carried out until a codec type is accepted by the gateway 17. If no common codec type is found, the connection from the receiving side is terminated. If a codec type is selected by the receiving side and communicated to the transmitting side that is not accepted or supported by the gateway 14, the connection is terminated in this case by the transmitting side.
  • FIG. 2 shows an arrangement according to the invention for a codec negotiation, which is essentially similar to the arrangement from FIG. 1.
  • the arrangement from FIG. 2 has further databases 31 and 33, which the gateway controller 25 accesses.
  • the gateway controller 28 also accesses additional databases 32 and 34.
  • Additional codec lists designated with an active codec list (codec cache), are stored in the databases 31, 32.
  • the active codec list in the database 31 contains those codecs that are supported by the gateway 24, and the database 32 contains the codecs that are supported by the gateway 27.
  • Databases 33 and 34 contain further codec lists that are identical. This codec list only contains the codecs, which are contained in both active codec lists in databases 31 and 32 and also in the administratively specified codec lists from databases 26 and 29.
  • codec types are periodically queried by the gateway controller 25 at the gateway 24 independently of a call setup in the background.
  • the codec types which are supported by the gateway 24 are stored in the database 31 as an active codec list.
  • the gateway controller 28 periodically queries the codec types at the gateway 27 in order to store the accepted codec types in the database 32 as an active codec list.
  • the active codec list can be created in such a way that when the gateway 24 or 27 is registered for the first time in the network, all supported codecs are reported to the gateway controller 25 or 28. Changes in supported codecs are also communicated to the gateway controller 25 or 28. Knowledge of the supported codec types is thus built up and stored individually for each gateway, regardless of the call setup, by means of a specific query.
  • the gateway controllers 25 and 28 enter into a codec negotiation.
  • the gateway controller 25 does not send the codec list from the database 26 to the gateway controller 28, but rather a codec list that only contains codec types that are in both the codec list in the database 31 and in the codec List of database 26 are included.
  • the gateway controller 28 thus receives a codec list with codec types which are supported by the gateway 24 in all cases. A later termination of the connection due to the non-acceptance of a codec type by the gateway 24 is thus avoided.
  • the gateway controller 28 now selects a codec type from the received codec list, which is also contained in the codec list in the database 32 and in the codec list in the database 29.
  • the selected codec type is also contained in the active codec list in the database 32, it is supported by the gateway 27.
  • the two gateway controllers 25, 28 can only negotiate in the codec negotiation about codec types that are supported by the gateways 24 and 27. A later termination due to the non-acceptance of a codec type by one of these two gateways 24, 27 is thus excluded.
  • each codec type In addition to the codec types that must be signaled for a voice connection during the codec negotiation, all available codec types are each transmitted from the sending side to the receiving side and from the receiving side to the sending side.
  • This codec list contains the intersections of the codec lists from the databases 26, 29, 31 and 32, so to speak.
  • the codec types contained in it are supported by both gateways 24 and 27.
  • Both gateway controllers 25 and 28 store this codec list in the databases 33 and 34, respectively. If a switch is now made to a fax / modem transmission during a connection, each codec type can be selected from the intersection codec list in the databases 33, 34 from each side. In any case, it is guaranteed that the call can be switched successfully and that there is no termination.

Abstract

L'invention concerne un procédé de transaction avec codage/décodage entre deux dispositifs de commande de passerelle (25, 28), ces derniers gérant une liste de codage/décodage indépendamment de la connexion à l'aide de différents types de codage/décodage, lesquels sont supportés par une passerelle média (24, 27) correspondante, de manière à éviter une déconnexion ultérieure d'une liaison établie provoquée par des codages/décodages non supportés.
EP02798271A 2001-12-21 2002-12-12 Procede et dispositif pour transaction avec codage/decodage Withdrawn EP1457021A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10163478 2001-12-21
DE10163478A DE10163478C2 (de) 2001-12-21 2001-12-21 Verfahren und Anordnung zur Codec-Verhandlung
PCT/DE2002/004561 WO2003056776A1 (fr) 2001-12-21 2002-12-12 Procede et dispositif pour transaction avec codage/decodage

Publications (1)

Publication Number Publication Date
EP1457021A1 true EP1457021A1 (fr) 2004-09-15

Family

ID=7710519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02798271A Withdrawn EP1457021A1 (fr) 2001-12-21 2002-12-12 Procede et dispositif pour transaction avec codage/decodage

Country Status (4)

Country Link
US (1) US20050091392A1 (fr)
EP (1) EP1457021A1 (fr)
DE (1) DE10163478C2 (fr)
WO (1) WO2003056776A1 (fr)

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Also Published As

Publication number Publication date
DE10163478A1 (de) 2003-07-17
DE10163478C2 (de) 2003-12-18
WO2003056776A1 (fr) 2003-07-10
US20050091392A1 (en) 2005-04-28
WO2003056776A8 (fr) 2008-05-08

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