EP1433301A1 - Procede et dispositif pour la signalisation d'une transaction avec codage-decodage sur des reseaux de signalisation heterogenes - Google Patents

Procede et dispositif pour la signalisation d'une transaction avec codage-decodage sur des reseaux de signalisation heterogenes

Info

Publication number
EP1433301A1
EP1433301A1 EP02774332A EP02774332A EP1433301A1 EP 1433301 A1 EP1433301 A1 EP 1433301A1 EP 02774332 A EP02774332 A EP 02774332A EP 02774332 A EP02774332 A EP 02774332A EP 1433301 A1 EP1433301 A1 EP 1433301A1
Authority
EP
European Patent Office
Prior art keywords
network
terminal
codec
codecs
list
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.)
Pending
Application number
EP02774332A
Other languages
German (de)
English (en)
Inventor
Helmut Schmidt
Bernd Siegwart
Erik Margraf
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 EP1433301A1 publication Critical patent/EP1433301A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/253—Telephone sets using digital voice transmission
    • H04M1/2535—Telephone sets using digital voice transmission adapted for voice communication over an Internet Protocol [IP] network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0072—Speech codec negotiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0025—Provisions for signalling
    • 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
    • H04M7/126—Interworking of session control protocols
    • H04M7/1265—Interworking of session control protocols where the session control protocols comprise H.323 and SS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13176—Common channel signaling, CCS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13196—Connection circuit/link/trunk/junction, bridge, router, gateway
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet

Definitions

  • the invention relates to a method for signaling a codec negotiation over heterogeneous signaling networks according to the preamble of claim 1 and an arrangement therefor.
  • Switching such as the Internet
  • connection-oriented telecommunication communication which is reduced in cost or also improved possibilities for integrating value-added services.
  • This is due in particular to the efficient capacity utilization of a connection, since in contrast to circuit switching, packet switching does not occupy the physical transmission medium for the entire duration of the connection.
  • Protocols such as the frame relay, are available. The idea of also packing voice into IP packets was not too distant. VoIP (Voice over IP) solutions are particularly interesting for companies that have an IP router network and use the public network to make calls.
  • the data to be transported are divided into individual data packets, each data packet receiving an address code which identifies the recipient of the transmission.
  • the individual data packets are then transmitted independently of one another - they can even use different transmission paths.
  • the principle of packet switching is defined in various standards, a well-known standard is described in ITU-T recommendation x.25.
  • Predicted voice communication the language is digitized and, if necessary, compressed by hardware or software (source-coded), the compressed language then representing the useful data area of the IP packets. Dialed numbers are converted into IP addresses that are sent to the IP header as destination information.
  • the IP packets are now transported to the remote site of the voice connection via several network nodes distributed in the data network. The remote station saves the incoming packets and reassembles them in the correct order. If a packet is damaged or lost, it will not be sent again.
  • the voice information is extracted from the packets, which is then fed to a coding device, in which the information is then inversely source and / or channel coded and then made audible via suitable hardware.
  • codecs Hardware and / or software modules which combine the functions of a coder and a decoder are referred to as codecs, since the transmission of information between two points often involves transmission in both directions.
  • codec is tailored to the characteristics of an input signal, such as voice and / or video signals.
  • the practical implementation takes place either as hardware by DSPs (Digital Signal Processors) or by codec programs implemented in software.
  • DSPs Digital Signal Processors
  • codec programs implemented in software.
  • a decompression algorithm is required to use the data, which cancels the compression. This means that every compression has a corresponding decompression that 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.
  • G.711 is a recommendation of the International Telecommunication Union (ITU), which describes the digitization of audio data in telephone quality (3.1 kHz bandwidth) with a data rate of 56 kbit / s or 64 kbit / s. The process is called pulse code modulation and is used in the analog telephone network or in ISDN.
  • G.723 defines a voice compression process for use in narrowband, multimedia applications with data rates of 6.4 and 5.3 kbit / s.
  • codecs are used to encode the data to reduce storage space requirements or to speed up data transmission.
  • the codec used for sending the data for decoding / decompressing the received data must be available on the receiver side. From this point of view, the sending terminal creates a codec list and brings about agreement with the received terminal by means of a so-called negotiation regarding the codec to be used for sending and receiving.
  • the codec negotiation takes place in connection with the call signaling.
  • the received terminal device selects a codec it supports from the received codec list. This selection is signaled back to the sending terminal.
  • An essential idea of the invention is that the codec list of the supported codecs is re-sorted before the signaling call in the transmission network.
  • the codec list is rearranged in such a way that a codec is placed at the top of the list, which is (most likely) supported by a terminal in the receiving network.
  • the list is sorted according to a defined and administratively specified order. It makes sense to put a codec in the first place in the defined order, which is supported by end devices in as many networks as possible. This If the number of signaling calls is significantly lower, the terminal rejects the call in the receiving network and thus increases the success rate of the transmissions.
  • the term terminal is understood above and hereinafter to mean a terminal or a switching center. It is essential that a corresponding call signaling protocol is terminated there.
  • a transit network is interposed between the transmission network and the reception network.
  • This is e.g. B. useful when using the method in IP telephony.
  • IP network for example the public Internet, is used as the transit network. This enables, for example, a telephone call between Munich and Hamburg to be made at a lower cost than a comparable long-distance call made entirely over the public telephone network.
  • a terminal of the transit network preferably signals the codec list unchanged to a terminal of the receiving network.
  • the terminal in the transit network likewise preferably selects a limited number of elements, in particular only the first element, from the codec list. Even if the terminal of the transit network only supports the first element of the codec list, all information, in particular the complete codec list of the transmitting network, is still forwarded to the receiving network.
  • the codec negotiation between the terminal in the receiving network and the terminal in the transmitting network is not subject to any restrictions as a result of a possibly limited support for the codec list of the terminal in the transit network.
  • An arrangement according to the invention has a transmission network Terminal (terminal device in the narrower sense or an interworking point (IWP)) that supports at least one codec, and a receiving network with a terminal that also supports at least one codec.
  • the arrangement also has a sorting device for sorting the codec list.
  • An advantageous embodiment of the arrangement according to the invention has a sorting device which comprises a database for storing a defined sequence of codecs in the codec list. Furthermore, the sorting device has a processor for executing the sorting of the codec list.
  • the terminal in the transmission network corresponds to the H.323 standard.
  • Standard is a recommendation of the International Telecommunication Union (ITU) and describes the transport of multimedia data over IP-based networks, in particular the transport with bidirectional real-time communication connections.
  • ITU International Telecommunication Union
  • FIG. 1 shows a structure of a communication terminal according to the H.323 standard
  • FIG. 3 is a simplified representation of a network environment with two networks for a method of the present invention.
  • Fig. 4 is a simplified representation of a network environment with three networks for a method according to the present Invention.
  • H.323 outlines a system structure of a terminal 10 according to the H.323 standard, which is a recommendation of the International Telecommunication Union (ITU) and was developed for video conferences via LANs (Local Area Networks) and WANs (Wide Area Networks) .
  • the H.323 standard takes into account data transmission characteristics in LANs and other packet-switching networks, such as fluctuating data rates and delays.
  • H.323 is generally intended for use over networks that do not provide guaranteed QoS (Quality of Service) for the duration of the connection.
  • QoS Quality of Service
  • H.323 uses the protocols known from the Internet, UDP (User Datagram Protocol) and RTP (Real-Time Protocol).
  • a protocol device 12 defines the coding of audio signals and video signals.
  • codecs for each data category, audio / video data, data packets or control signals, which are also standardized. Which codec is used for communication depends on the available resources (computer power, transmission bandwidth) and the desired quality and is determined by the system controller 14 when the connection is established.
  • the control system 14 uses standardized codecs, for example G.711, G.722, G.723 and MPEG-1 as audio codecs, and H.261 and H.263 as video codecs.
  • the coding of the data with codecs and the code signaling are not bound to the IP as a transport layer. Other transport layers, for example ATM, can also be used.
  • the G.723 standard for VoIP transmission is of particular importance, since a data stream with a data rate of 5.3 kbits / s and good voice quality is available at the output of a coding according to this standard.
  • the video data are coded using the video codecs 18. primed.
  • the H.263 standard is particularly important here, since this codec compresses video data to a data rate of less than 64 kbit / s.
  • connection management in a system controller 14 is based on signaling protocols, for example H.245 and the H.225 protocol based on Q.931.
  • Terminal 10 is connected via a LAN interface 8, for example to a gateway.
  • LAN interface 8 for example to a gateway.
  • H.323 systems can be connected to each other via a LAN network. Terminals in this network can communicate with terminals in other networks via a gateway.
  • a heterogeneous network environment, in which two networks 22, 26 are connected via a gateway 20, is outlined in FIG. 2 for a signaling method.
  • a first network 22 is shown, which has a terminal 10 according to FIG. 1 and a gatekeeper 24.
  • the ISUP + standard does not really mean a standard.
  • the gateway 20 transitions from the first network 22 to the second network 26 and the associated conversion between different transmission formats. Gateways are used, for example, to connect the public telephone network to the Internet.
  • the gatekeeper 24 has the task of checking the access authorizations of the users when establishing the connection, performing address conversions and managing the bandwidth available for the communication.
  • the second network can also have a gatekeeper without restricting generality, even if it is not shown in this example.
  • the terminal 10 In the event of a signaling call, the terminal 10 signals the terminal 28 a codec list via the gateway 20, for example wise with Codec G.723 in the first place. A data stream of only 5.3 kbit / s is sufficient for this standard. However, since terminal 28 does not have this G.723 codec, call setup between terminal 10 and terminal 28 is terminated by the latter. Terminal 28 rejects the signal call from terminal 10.
  • FIG. 3 shows an arrangement of a heterogeneous network environment consisting of two networks 32, 36, which are connected via the gateway 30, in which the method according to the invention comes into play.
  • the networks 32, 36 each have a terminal or a switching center 10, 38 with respective codecs, which are compiled in a codec list.
  • Terminal 10 is a terminal according to the H.323 standard, whereas terminal 38 is configured according to the ISUP + standard.
  • this arrangement corresponds approximately to the arrangement from FIG. 2.
  • the structure and function of the gatekeeper 34 also corresponds to the structure and function of the gatekeeper 24 and is not described again here.
  • the network 32 additionally has a sorting device 40.
  • the sorting device 40 manages the codec list of all codecs that the terminal 10 supports.
  • the sorting device 40 has a database 42 for storing the codec list.
  • the sorting device 40 has a re-sorting stage 44 in order to generate the codec list which the terminal 10 signals to the terminal 38 via the gateway 30.
  • the sorting device 40 does not have to be assigned to the network 32. For example, it can also be assigned to the gateway 30 or generally to an IWP between two networks.
  • the primary list of the codecs supported by the terminal 10 is rearranged in the sorting device 40 in relation to the sequence stored in the database 42. For example, this list can be rearranged in such a way that position is no longer codec G.723, but codec G.711.
  • Terminal 10 now signals this rearranged list to terminal 38 via gateway 30. Since the terminal 38 also supports the G.711 standard, the signaling call from the terminal 10 is not rejected by the terminal 38, a connection between the two terminals 10, 38 is thus established.
  • FIG. 4 A network arrangement is sketched in FIG. 4, which comprises the elements of the arrangement from FIG. 3 and additionally a network 32 '.
  • the configuration of the networks 32, 36 from FIG. 4 corresponds to that of the networks 32, 36 from FIG. 3 and will not be described again at this point.
  • the additional network 32 ' comprises a gatekeeper 34', a terminal 10 'according to the H.323 standard and a sorting device 40'.
  • the sorting device 40 ' also has a database 42' for storing the codec list and a re-sorting stage 44 'for sorting the codec list.
  • Terminal 10 signals terminal 10 'that a call is being set up. However, this does not take place via a direct connection between them, but via the gateway 30, the network 36 and the gateway 30 '. 4, the networks 32 and 32 'are shown as two similar networks. However, it is also possible that the network 32 'is identical to the network 32, or else that the two networks 32 and 32' are different. For example, "networks" 32, 32 'could be different exchange areas of the public telephone network and network 36 could be the Internet.
  • network 36 is used as a transit network.
  • Terminal 38 does not support all codecs that support terminals 10, 10 '. In the case of an unsorted signaling call from terminal 10, terminal 38 would reject the call if it was first
  • the sorting unit 40 sorts the codec list of the codecs supported by the terminal 10 in such a way that a codec which the terminal 38 also supports is in the first position. Therefore, terminal 38 does not reject the signaling call, but instead calls terminal 10 '.
  • the terminal 10 is then connected to the terminal 10 'via the terminal 38.
  • the codec list re-sorted by the sorting device 40 is fully signaled further from the terminal 38 to the terminal 10 '.
  • Terminal 10 'thus receives a codec list with all codecs supported by terminal 10, even if some of these codecs in this list are not supported by terminal 38.
  • the codec list of the terminal 38 which is restricted in comparison to the codec lists of the terminals 10, 10 ', has no restrictive effect on the signaling of the codec list from the terminal 10 via the gateway 30, the terminal 38 and the gateway 30' Terminal 10 '.
  • FIGS. 3 and 4 Network environments were shown in FIGS. 3 and 4, in each of which the sending network 32 has a sorting device 40 for sorting the codec list.
  • the network 36 has no corresponding sorting device in both representations.
  • the sorting device shown here as an illustration of the invention as a receiving or transit network can also have such a sorting device.
  • the network 32 'in FIG. 4 does not necessarily require the sorting device 40' in the situation described above to use the method according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour la signalisation d'une transaction avec codage-décodage sur des réseaux de signalisation hétérogènes. Dans un environnement de réseaux hétérogènes, il peut y avoir, pour une transmission, des interfaces qui sont soumises à des limitations en ce qui concerne une transaction avec codage-décodage. En particulier les cas où, dans le réseau cible, seul un ensemble limité de codecs est supporté et/ou signalé, ou bien où un réseau cible ne comporte qu'un nombre limité d'éléments, par exemple un seul élément, à partir desquels des listes de codecs proposées peuvent être extraites ou exploitées posen des problèmes. Le cas échéant, cela peut avoir pour conséquence le refus de liaisons, si des codecs non supportés sont signalés. L'objectif de la présente invention est d'offrir un procédé amélioré de signalisation de transactions avec codage-décodage, selon lequel le moins possible d'appels de signalisation sont refusés. Une idée essentielle de l'invention est que, avant l'appel de signalisation, dans le réseau d'émission, la liste des codecs supportés est réétablie. Le réétablissement de la liste des codecs se fait de telle sorte qu'en première place de la liste est placé un codec qui est supporté (avec une probabilité maximale), par un terminal du réseau de réception.
EP02774332A 2001-10-05 2002-09-11 Procede et dispositif pour la signalisation d'une transaction avec codage-decodage sur des reseaux de signalisation heterogenes Pending EP1433301A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10149284 2001-10-05
DE10149284 2001-10-05
PCT/DE2002/003383 WO2003032615A1 (fr) 2001-10-05 2002-09-11 Procede et dispositif pour la signalisation d'une transaction avec codage-decodage sur des reseaux de signalisation heterogenes

Publications (1)

Publication Number Publication Date
EP1433301A1 true EP1433301A1 (fr) 2004-06-30

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EP02774332A Pending EP1433301A1 (fr) 2001-10-05 2002-09-11 Procede et dispositif pour la signalisation d'une transaction avec codage-decodage sur des reseaux de signalisation heterogenes

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Country Link
US (1) US20040258016A1 (fr)
EP (1) EP1433301A1 (fr)
WO (1) WO2003032615A1 (fr)

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Publication number Publication date
US20040258016A1 (en) 2004-12-23
WO2003032615A1 (fr) 2003-04-17

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