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WO2003005667A1 - Procede de transmission d'informations par l'intermediaire d'un reseau oriente paquets - Google Patents

Procede de transmission d'informations par l'intermediaire d'un reseau oriente paquets Download PDF

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Publication number
WO2003005667A1
WO2003005667A1 PCT/DE2002/001947 DE0201947W WO03005667A1 WO 2003005667 A1 WO2003005667 A1 WO 2003005667A1 DE 0201947 W DE0201947 W DE 0201947W WO 03005667 A1 WO03005667 A1 WO 03005667A1
Authority
WO
WIPO (PCT)
Prior art keywords
packet
pbx
communication
communication device
oriented
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.)
Ceased
Application number
PCT/DE2002/001947
Other languages
German (de)
English (en)
Inventor
Klaus Wille
Rainer Windecker
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of WO2003005667A1 publication Critical patent/WO2003005667A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L65/1023—Media gateways
    • H04L65/1026—Media gateways at the edge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5691—Access to open networks; Ingress point selection, e.g. ISP selection
    • H04L12/5692—Selection among different networks
    • 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
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42314—Systems providing special services or facilities to subscribers in private branch exchanges
    • H04M3/4234—Remote access to features of PBX or home telephone systems-teleworking in a PBX
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/0024—Services and arrangements where telephone services are combined with data services
    • H04M7/0036—Services and arrangements where telephone services are combined with data services where the data service is an information service
    • 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
    • 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
    • H04M7/125—Details of gateway equipment
    • H04M7/1255—Details of gateway equipment where the switching fabric and the switching logic are decomposed such as in Media Gateway Control

Definitions

  • the invention relates to a method for transmitting useful information in packet-oriented networks under the control of a central communication device.
  • VoIP Voice over IP
  • packet-oriented networks e.g. LANs (Local Area Network), MANs (Metropolitan Area Network) or WANs (Wide Area Network) in office communication are used by many manufacturers of communication systems to design their architecture exclusively according to a VoIP transmission principle, and thus already installed facilities for packet-oriented data transmission (such as network servers , Data lines etc.) can also be used for communication purposes.
  • LANs Local Area Network
  • MANs Metropolitan Area Network
  • WANs Wide Area Network
  • the decisive factor for the acceptance of the VoIP procedure in telecommunications is the integration and use of existing telecommunications systems, so that the user can continue to use his familiar phone infrastructure with all known features.
  • the use of packet-oriented data transmission methods for communication systems often results in losses in the quality of the data to be transmitted - in particular voice data - which is primarily due to the mutual conversion of a continuous data stream into individual data packets. Since packet-oriented networks are generally designed in accordance with a data transport protocol whose runtime tolerances for the transmission of the data packets are in a very wide range, so-called dead times in the regeneration of the continuous data stream from the transmitted data packets are inevitable.
  • Line Trunk Units of line-switching telecommunication systems, which carry out a bidirectional conversion between IP packets and a continuous data stream
  • the full range of features is the contemporary line-switching one Offer communication systems, accessible, but not the same voice quality.
  • the present invention is based on the task of implementing a packet-oriented transmission method for connecting VoIP communication terminals to a communication system operating on the principle of line switching.
  • Cation system specify, while at the same time an improved quality of the data to be transmitted can be achieved.
  • useful information of a communication terminal connected to a central communication device via a packet-oriented network is either forwarded directly to another communication terminal connected to the packet-oriented network or - in the case of a time slot-oriented communication terminal connected to the communication device - transmitted to the communication device via the packet-oriented network, i.e.
  • the user information is transmitted as a function of the connection type - packet-oriented or time slot-oriented - of the target communication terminal at the central communication device.
  • An important advantage of the method according to the invention is that a direct transmission of the packet-oriented useful information from a VoIP communication terminal via the packet-oriented network to a further VoIP communication terminal means that there is no need to convert the packet-oriented useful information in the communication device.
  • a conversion of packet-oriented into time-continuous user information is used in many conventional time-slot-oriented communication devices in order to make it easy to connect VoIP communication terminals, the data packets converted into a time-continuous signal being fed to a conventional time-slot-oriented switching network and routed to a destination. Communication terminal are performed. If this target communication terminal is in turn configured in accordance with the VoIP method, however, the user information must be converted again into the packet-oriented format.
  • a further advantage of the method according to the invention is that the switching function of the communication device enables a connection to the performance features familiar from modern, line-switching communication devices.
  • the communication device therefore reserves the right to control the performance features and the establishment or termination of the connection, while the exchange of useful information when two are connected
  • VoIP communication terminals Voice over IP
  • packet-oriented network via the packet-oriented network.
  • the transmission of the packet-oriented useful information is directed in the direction of the packet-oriented network or on the switching device by a network node device controlled by the communication device - often referred to in the literature as a gateway.
  • Controlling this network node device by the communication device - for example by its switching and performance control unit - has the advantage over direct transmission of the packet-oriented useful information from the calling to the called communication terminal that the communication terminals are exclusively connected to the network node device as the associated communication partner.
  • This is particularly suitable for use in modern communication facilities of importance in which almost the entire intelligence of the connection and managerial ⁇ Performance control is shifted into the communication device and the communication device associated terminals essentially only have input and output elements that are controlled by the communication device.
  • FIG. 1 a structural diagram for the schematic representation of a communication system according to the invention in a first embodiment
  • FIG. 2 a structural diagram for the schematic representation of a communication system according to the invention in an extended embodiment.
  • the third communication terminal TKC is connected to a connection unit LTU3 of the communication device PBX via a line transporting signaling information SI, shown in broken lines, and a further line carrying useful information NI.
  • the communication terminals TKA, TKB are designed as VoIP communication terminals and accordingly replace them
  • These communication terminals TKA, TKB are connected via a packet-oriented network LAN to respective connection units LTU1, LTU2 of the communication device PBX, with a respective gateway device GW1, GW2 being interposed between the lines transmitting useful information NI.
  • a respective gateway device GW1, GW2 being interposed between the lines transmitting useful information NI.
  • the communication device PBX works according to a time slot-oriented switching principle - often referred to in the professional world as "Time Division Multiplex", TDM - and accordingly has a corresponding switching matrix TDM.
  • the lines of the communication terminals TKA, TKB, TKC which transmit the user information NI are connected to the switching matrix TDM via respective connection units LTU1, LTU2, LTU3, which are assigned to the communication terminals TKA, TKB, TKC.
  • a further central component of the communication device PBX is a switching and performance feature control CP.
  • This switching and performance feature control unit CP is connected to the connection units LTU1, LTU2, LTU3 and provides the respective communication terminals
  • TKA, TKB, TKC accordingly - represent a transmission end point of the signaling information SI.
  • Signaling information SI corresponds to the data that is sent, for example, in the case of an ISDN connection via a so-called D channel and contains data for connection control, signaling, etc.
  • this signaling information contains data that go beyond the content of standardized ISDN protocols and, among other things, enable extended features such as the name and other information of a calling or called subscriber to be displayed on the communication terminal TKA, TKB, TKC of a called or calling subscriber ,
  • Another component of the data exchanged between a communication terminal TKA, TKB, TKC and the switching device PBX are the useful information NI, which contains, for example, voice and / or video communication data. In an ISDN communication system, this useful information is transmitted via one or more so-called B channels.
  • connection units LTU1 which are designed differently from the connection unit LTU3, which operates continuously over time.
  • LTU2 with regard to the useful information NI via the converting gateway devices GW1, GW2.
  • the communication terminals TKA, KB each have tunneling units TE, which break down the useful and signaling information NI, SI of the respective communication terminal TKA, TKB into data packets and transfer them to the packet-oriented network LAN.
  • the measure of "tunneling” means the decomposition of a time-continuous data stream, ie the signaling or useful information signals NI, SI into individual data packets and a target addressing of these data packets with the IP number of the target communication partner.
  • TKB - data packets which are intended for the respective communication terminal TKA, TKB are converted into a continuous-time data stream.
  • a jitter buffering is implemented in the respective tunneling unit TE, which will be explained later.
  • Another component of the communication terminals TKA, TKB working according to the VoIP method is a function module IPRF, which decodes and executes routing function calls initiated by the communication device PBX with respect to the addressing of data packets containing user information NI via the packet-oriented network LAN. When addressing this data packets containing NI user information, these are set by the function module IPRF to the IP address ("Internet Protocol") identifying the corresponding communication partner. This process is explained in more detail in the description below of an exchange between the first and the second communication terminal TKA, TKB.
  • the data packets in the packet-oriented network LAN are principally transmitted independently of one another and occasionally even a loss of data packets occurs, the data packets generally do not arrive at the exit point at isochronous time intervals.
  • the data packets are temporarily stored in a data packet buffer memory (not shown), which works on the basis of the flow principle, from which the data packets are read at constant time intervals before the data stream NI of data is assembled. In this way, a continuous data stream can be reconstructed from the data packets arriving at irregular time intervals.
  • Such a data packet buffer memory is often also referred to as a jitter buffer and is a component (not shown) of the gateway devices GW1, GW2 and the tunnel units TE of the communication terminals TKA, TKB.
  • a disadvantage of using such a jitter buffer is that the data transmission is additionally delayed as a result.
  • the method according to the invention therefore does not provide any switching of the user information NI via the switching matrix TDM when establishing a connection between the two VoIP communication terminals TKA, TKB, since the user information NI can only be supplied to the switching matrix TDM in the form of a continuous data stream and therefore an additional one Conversion of the data packets into a continuous data stream would be necessary.
  • the useful information NI transmitted in data packets is transported by the first VoIP communication terminal TKA via a transmission path (shown in dotted lines) directly over the packet-oriented network and internally converted again into a time-continuous signal by the second VoIP communication terminal TKB.
  • a control component (not shown) of the switching and service feature control CP checks in a database (not shown) of the communication device PBX whether both end points of the requested connection, in this case the two VoIP communication terminals TKA, TKB, after the VoIP -Procedure work.
  • addressing information of the target communication terminal TKB is transmitted in the form of signaling information SI to the function module IPRF of the communication terminal TKA, for example in the form of an IP address identifying the corresponding communication partner which transmits the packet-oriented user information NI or from which the packet-oriented user information NI is to be received.
  • the destination communication terminal TKB is operated in a similar manner.
  • the packet-oriented user information is NI - in the drawing with a dashed line Horizontal line symbolizes the pictorial representation of the packet-oriented network LAN - exchanged via the packet-oriented network LAN.
  • the transmission path described above cannot be carried out via the packet-oriented network LAN.
  • the useful information NI transmitted in data packets is routed via the packet-oriented network LAN to the gateway device GW1 - in the drawing with a dashed line vertically to illustrate the packet-oriented one
  • Network LAN symbolizes - and from this converted into a continuous-time signal and transferred to the connection unit LTU1.
  • the communication device PBX then carries out time slot-oriented switching via the switching matrix TDM, which causes the useful information NI to be switched through between the connection units LTU1, LTU3 assigned to the first and third communication terminals TKA, TKC.
  • a transmission of the user information NI to the switching matrix TDM of the communication device PBX is not only necessary in cases in which a participating communication terminal TKC is not connected using the VoIP method. Also when switching between two VoIP communication terminals TKA, TKB, a transmission of user information NI from the communication device PBX to a communication terminal is necessary, for example for the transmission of signal tones such as a "busy" sign.
  • These signals are generated - analogous to a traditional, time-slot-oriented exchange structure - in the exchange and feature control CP and via the coupling Field TDM is switched through to the respective connection unit LTU1, LTU2, at which the data is packaged via the corresponding gateway device GW1, GW2 and set to the IP address of the associated VoIP communication terminal TKA, TKB.
  • FIG. 2 shows a communication device PBX with three communication terminals TKA, TKB, TKC controlled by this communication device PBX.
  • FIG. 2 represents an embodiment that is expanded compared to FIG. 1, a detailed description of individual functional components is not provided, insofar as this has already been done for similar functional components in FIG. 1. This embodiment is therefore explained below with reference to similar or identical functional units of FIG. 1.
  • gateway devices GW1, GW2 - controlled by the communication device PBX - routing - which is often referred to in the art as "routing" - the packetized useful information NI. Since the routing has been relocated to these gateway devices GW1, GW2, the function module IPRF is omitted in the VoIP communication devices TKA, TKB of the previous exemplary embodiment.
  • the gateway devices GW1, GW2 are controlled by the switching and performance control CP belonging to the communication device PBX.
  • the two gateway devices GW1, GW2 are each identified by a changeover switch, whereby this changeover is not to be understood in physical terms, but rather a respective destination addressing of the data packets associated with the respective useful information NI, caused by the gateway devices GW1, GW2 symbolizes.
  • The- "Switching" means a re-addressing, controlled by the switching and performance feature control CP, of the IP data packets assigned to the payload information NI.
  • the communication device PBX is directly connected to the packet-oriented network LAN via a first and second connection unit LTU1, LTU2 with respect to the signaling information SI and is connected to the packet-oriented network LAN with respect to the useful information NI via the first and second gateway devices GW1, GW2.
  • a switching process of a calling subscriber at the first communication terminal TKA to a subscriber at the second communication terminal TKB is described below.
  • the upcoming connection request is initiated by logging on to the communication device PBX - for example by lifting the handset.
  • This lifting of the handset is detected by the communication device PBX with the aid of a corresponding signaling information SI, which is transmitted from the first communication terminal TKA via the tunneling unit TE to the packet-oriented network LAN and finally to the first connection unit LTU1, where it is connected Continuous-time signal re-converted - reaches the switching and feature control CP.
  • the switching and feature control CP then causes a dial tone to be switched to the payload channel NI of the first communication terminal TKA.
  • a dial tone generator (not shown) is switched through to the first connection unit LTU1 via the switching matrix TDM.
  • the gateway device GW1 is controlled by the switching and performance feature controller CP in such a way that there is a logical “connection” through the packet-oriented network LAN to the first communication device TKA.
  • the IP address of the recipient of the data packets assigned to the useful information NI is set by the first gateway device GW1 to the IP address of the tunneling unit TE belonging to the first communication terminal TKA.
  • the tunneling unit TE associated with the first communication terminal TKA converts the data packets thus obtained into a continuous-time signal and makes them available to the first communication terminal TKA.
  • a - not shown - control component of the switching and performance feature control CP checks in a - not shown - database of the communication device PBX whether both end points of the requested connection, in this case the two communication terminals TKA, TKB with their associated tunneling units TE, according to VoIP procedures work. If both communication partners are identified as communication partners using the VoIP method, the switching and performance feature control CP initiates further procedures analogous to the procedure described above, such as the signaling of an incoming call on the second communication terminal TKB.
  • the switching and performance feature control CP switches the "through-connection", explained in more detail below, of the user information NI exchanged between the first and second communication terminals TKA, TKB via the packet-oriented network LAN - indicated in the drawing by a dotted line connecting the gateway devices GW1, GW2.
  • the gateway devices GW1, GW2 are controlled by the switching and performance feature controller CP in such a way that the destination IP address of the user information NI originating from TKA is set from GW1 to GW2 and - in another direction - the GW2 packets originating from TKB are set to the destination address of GW1.
  • the packet-oriented user information NI is exchanged via the packet-oriented network LAN.
  • the advantage of this exemplary embodiment compared to the aforementioned exemplary embodiment is based on the fact that the communication terminals TKA, TKB connected to the packet-oriented network LAN always have the same communication partner, namely their respective assigned gateway device GW1, GW2.
  • the “inquiry” feature is advantageously carried out by the switching and service feature controller CP. If a subscriber on the first communication terminal TKA wants a query to a subscriber on the " third " during a conversation with another subscriber on the second communication terminal TKB Initiate communication terminal TKC, the first gateway device GWl is controlled to a logical "connection" to the connection unit LTUl and to the switching network TDM, from where a connection to the third communication terminal TKC is established.
  • the figurative logic circuit means that the user information NI of the communication terminal TKA is now converted to a continuous data stream instead of the IP address of the second gateway device GW2 and transmitted to the first connection unit LTU1.
  • the subscriber of the second communication terminal TKB is "switched through” to the second connection unit LTU2 and receives an acoustic signal via the switching matrix TDM and a tone generator (not shown) that its existing connection is being held.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé de transmission d'informations par l'intermédiaire d'un réseau orienté paquets (LAN). Dans un premier terminal de communication (TKA) relié au dispositif de communication (PBX) par l'intermédiaire du réseau orienté paquets (LAN), et dans le cas d'une liaison ou d'une communication existante en direction et/ou en provenance d'un deuxième terminal de communication (TKB) relié au dispositif de communication (PBX) par l'intermédiaire du réseau orienté paquets (LAN), une transmission d'informations utiles (NI) est effectuée en direction du deuxième terminal de communication (TKB) par l'intermédiaire du réseau orienté paquets (LAN). Dans le cas d'une liaison ou d'une communication existante en direction et/ou en provenance d'un troisième terminal de communication (TKC) relié au dispositif de communication (PBX) de façon orientée en fenêtres temporelles, une commutation est effectuée en direction du dispositif de communication (PBX).
PCT/DE2002/001947 2001-07-05 2002-05-27 Procede de transmission d'informations par l'intermediaire d'un reseau oriente paquets Ceased WO2003005667A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10132592.4 2001-07-05
DE10132592A DE10132592A1 (de) 2001-07-05 2001-07-05 Verfahren zur Informationsübermittlung über ein paketorientiertes Netzwerk

Publications (1)

Publication Number Publication Date
WO2003005667A1 true WO2003005667A1 (fr) 2003-01-16

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PCT/DE2002/001947 Ceased WO2003005667A1 (fr) 2001-07-05 2002-05-27 Procede de transmission d'informations par l'intermediaire d'un reseau oriente paquets

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DE (1) DE10132592A1 (fr)
WO (1) WO2003005667A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0966145A2 (fr) * 1998-06-19 1999-12-22 Nortel Networks Corporation Passerelle pour IP telephonie
WO2001035579A1 (fr) * 1999-11-10 2001-05-17 Quintum Technologies, Inc. Appareil pour passerelle telephonique de transmission vocale sur le reseau ip et procedes d'utilisations correspondants

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0966145A2 (fr) * 1998-06-19 1999-12-22 Nortel Networks Corporation Passerelle pour IP telephonie
WO2001035579A1 (fr) * 1999-11-10 2001-05-17 Quintum Technologies, Inc. Appareil pour passerelle telephonique de transmission vocale sur le reseau ip et procedes d'utilisations correspondants

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KORPI M ET AL: "SUPPLEMENTARY SERVICES IN THE H.323 IP TELEPHONY NETWORK", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER. PISCATAWAY, N.J, US, vol. 37, no. 7, July 1999 (1999-07-01), pages 118 - 125, XP000835313, ISSN: 0163-6804 *
RINDE J: "Telephony in the year 2005", COMPUTER NETWORKS, ELSEVIER SCIENCE PUBLISHERS B.V., AMSTERDAM, NL, vol. 31, no. 3, 11 February 1999 (1999-02-11), pages 157 - 168, XP004304596, ISSN: 1389-1286 *

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