EP1243104A1 - Procedes et systemes de connexion de centraux telephoniques a des reseaux a commutation par paquets via des liaisons virtuelles - Google Patents

Procedes et systemes de connexion de centraux telephoniques a des reseaux a commutation par paquets via des liaisons virtuelles

Info

Publication number
EP1243104A1
EP1243104A1 EP00986677A EP00986677A EP1243104A1 EP 1243104 A1 EP1243104 A1 EP 1243104A1 EP 00986677 A EP00986677 A EP 00986677A EP 00986677 A EP00986677 A EP 00986677A EP 1243104 A1 EP1243104 A1 EP 1243104A1
Authority
EP
European Patent Office
Prior art keywords
node
destination
packet
communication
packet switched
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Withdrawn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
EP00986677A
Other languages
German (de)
English (en)
Inventor
Richard Rogala
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP1243104A1 publication Critical patent/EP1243104A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • 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
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/563—Signalling, e.g. protocols, reference model
    • 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
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5663—Support of N-ISDN
    • 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
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671—Support of voice

Definitions

  • the present invention is generally related to telecommunication switching methods and systems. More particularly, the present invention is related to methods and systems for connecting telephony exchanges to packet switched networks using virtual trunks.
  • Networks provide end users with access to communications and diverse media.
  • Typical Networks include, for example: PSTN (Public Switched Telephone Network) , IP-based (Internet) , ISDN (Integrated Services Digital Network) , and PLMN (Public Land Mobile Network) .
  • PSTN Public Switched Telephone Network
  • IP-based Internet
  • ISDN Integrated Services Digital Network
  • PLMN Public Land Mobile Network
  • Networks provide end users with diverse applications such as: wired and wireless voice, multimedia access/transmission, Internet access, Voice over IP (Internet Protocol), etc.
  • Access to and communication over Networks is accomplished via hardware (e.g., switches, routers, servers, gateway controllers, etc.), and communications protocols (e.g., IP (Internet Protocol) , RLP (Radio Link Protocol) , ATM (Asynchronous Transfer Mode) , GSM (Global System for Mobile Communication), CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), etc.) .
  • IP Internet Protocol
  • RLP Radio Link Protocol
  • ATM Asynchronous Transfer Mode
  • GSM Global System for Mobile Communication
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • a hierarchy within the narrow band was generally built with access, local, region, transit and international networks. These networks were often built as tree structures, with big transit exchanges that required a lot of capacity. Also the networks were often duplicated for redundancy.
  • telephony exchange with virtual trunks allow for packet switched communications to be established in cooperation with existing narrow band communication equipment, thereby limiting the need for re-planning and development of narrow band switching networks .
  • a first narrow band node receives a indication from an originating narrow band node that a call is to be established on an incoming physical device via a packet switched network; the first node determines the destination for the call and seizes an outgoing virtual device; and the first node indicates to a subsequent node having a closer relationship to the destination device that a packet switched communication is to be setup and provides the second node with destination information for the physical device that is the destination for or will be receiving the packet switched call.
  • the process of transporting information to subsequent nodes is repeated until a node with the closest proximity to, or in association with, the physical device is notified.
  • a node for connecting telephone exchanges to networks using virtual trunks.
  • the node includes a telephone exchange for providing narrow band signaling capabilities with and between other nodes, and a packet switch network (PSN) interface for providing a connection to a packet switched network for the transmittal and retrieval of communications via the packet switched network.
  • PSN packet switch network
  • Figure 1 is an illustration of several nodes for facilitating communication and cooperation between packet switched and circuit switched networks
  • Figure 2 is an illustration of a system having a telephone exchange and switching hardware operating within the narrow band wherein circuit switched related signaling for identifying packet network routed communications may be facilitated within the invention
  • Figure 3 is an illustration of a system of an embodiment of the invention wherein a narrow band exchange equipment for signaling is incorporated within a node with Packet switched interfacing equipment;
  • Figure 4 is another illustration of the several nodes of Figure 1 wherein a communication is shown to be initiated A and routed within a packet based network from a first node a to a destination node b wherein the communication is terminated at its destination;
  • Figure 5 is an another illustration simplifying the interaction of nodes for communication and facilitation cooperation between a packet-based network and a circuit switched network;
  • Figure 6 is an illustration of a node for an embodiment of the present invention wherein telephone exchange hardware operates in cooperation with Packet switched networking module to communicate with and a packet switched network and convert packet- and circuit- based communication;
  • Figure 7 is an illustration of a packet switched networking module for an embodiment of the invention wherein a packet switched to circuit switched converter and packet switched protocol module is utilized to facilitate communication and cooperation between the packet switched network and telephone exchange equipment.
  • the present invention provides methods and system that combine signaling in the narrow band network to coordinate switching within the packet switch network.
  • connections setup in the packet switched network 101 can be meshed, allowing for a packet based communication and/or connection to be setup from its origin A to its destination B without being carried and switched in nodes b and c via, for example, the circuit switched network 102.
  • the packet switched 101 and narrow band (circuit switched) 102 networks will be used to describe voice and data capabilities throughout the rest of this description. It should be appreciated by those skilled in the art that packet-based networks include packet switched and IP networks.
  • a narrow band switch 203 generally includes software for handling the routing of circuit switched calls. Interfaces to the packet switched network can be adapted to the switch 203 for handling packet-based communication, as will be discussed in more detail.
  • the switch 203 under normal circuit switched applications generally connects telephony devices on the network.
  • ISUP signaling 204 is used to coordinate call placement.
  • equipment associated with the narrow band equipment 201 in Figure 1 is utilized as part of a node 300 wherein a narrow band exchange 301 and packet switch networking module 302 cooperate to facilitate the placement of a packet-based 303 communication 304.
  • the Narrow band exchange 301 provides ISUP signaling 305 between nodes, and the packet switch networking module 302 facilitates cooperation between narrow band 305 and packet switched networks 303 at the initiation and termination of the communication 304.
  • the node 300 represents the virtual device of the present invention that facilitates the connection of telephony exchanges to packet networks and cooperation between packet and voice based networks .
  • the packet switched address (and a identification of the connection) may be forwarded from an initiating node 401 (also shown as and referred to in the following sequence of actions as node "a") to the remote node 404 (example shown as node "d") through several intervening nodes, nl through n2 (also referred to as "b" and "c") .
  • Information is transmitted via ISUP 405 in the narrow band with circuit switched networking hardware.
  • a connection is setup between node a and d with packet switched signaling 407 (including the identity of the connection) via node 401.
  • All nodes may be traversed back so that node 401 receives nodes 404 ' s, address. Connection coordination is needed so that it is known if a node breaks the connection or changes the connection, and if a protocol between the nodes are needed.
  • Node "a” receives a indication that a call is to be established on incoming physical device. Node “a” finds the destination and selects an outgoing virtual device. Node “a” does not need to switch the call since a Virtual device is involved. Node "a” indicates to node "b” that a call is to be setup.
  • Node "b” receives the indication that a call is to be established on a virtual device. Node “b” finds the destination and selects an outgoing virtual device. No switching is needed since a virtual device is involved. Node "b” indicates to node "c" that a call is to be setup.
  • Node "d" receives a indication on a virtual device and finds the outgoing device, this device is a physical device. Now the packet switched connection needs to be setup. Node "d” connects with Node a via the packet switched network in order to begin retrieving the communication .
  • Each node in Figure 4 may be representative of a narrow band exchange. Trunks are used to get place traffic into the exchanges. The signaling protocol and the trunks are separated so that they can have a separate network for the signaling using a narrow band signaling protocol (e.g., which is usually the ISUP, ISDN User Protocol).
  • a narrow band signaling protocol e.g., which is usually the ISUP, ISDN User Protocol.
  • the destination exchange within Figure 4 would be Node “d” and Node "a” is the initializing exchange. In- between the initial exchange “a” and the destination “d” exchange might be several other exchanges that the call needs to be set up through. Additional signaling like ISUP would generally be used to carry out the signaling throughout all exchanges. Between node “a” and node “b”, there will generally be physical connections operating on different layers. The signaling layer, which is the ISUP, and then the actual layer where the connection is made. Routing tables are used at each node to identify whether it is the terminating node, or to further route the signaling information towards the terminating node. Although the signaling layer is used to coordinate the connection from A to B through the nodes (a-d) , it is beneficial for the actual connection will occur through the packet switch network.
  • the signaling layer which is the ISUP, and then the actual layer where the connection is made. Routing tables are used at each node to identify whether it is the terminating node, or to further route the signaling information towards the terminating
  • Node a physical device to virtual device. No action with PSN.
  • Node c Virtual device to virtual device. No action with PSN.
  • Node d Virtual device to physical device. Send connect request with own ATM address + connection id to node c.
  • Node c receives a connect request and check if the connection is operated between the virtual channels.
  • Node a receives a connect request and checks the if the virtual connection is operated. In this case it is operated to a physical device and the packet-switched (e.g., ATM) setup can be sent to node d.
  • packet-switched e.g., ATM
  • Node d receives a ATM connect request with the connection id.
  • Node d acknowledges the ATM connection and the packet-switched network connection is established.
  • Each node has identifiers for virtual channels in the narrow band protocol. Identifying information is provided to exchanges through the narrow band signaling to route the call to the right destination.
  • Nodes go through routing analyses, to identify which trunk should be used to approach the destination. So when a is looking for d, it goes through the virtual network (e.g., through ISUP signaling) and finds the destination B.
  • Node "d" will be responsible for going back through the packet switch network and picking up the call that it's waiting for at a, given nodes a's information.
  • Node d connects with Node a through the packet switch network, and find the call that's waiting for B. Addressing such as ATM or IP are utilized to identify the communication source and/or destination Initial signaling will have to carry with it addressing information for purposes of setting up the call through the packet-based network.
  • FIG. 5 a further illustration simplifying the interaction 503 of nodes a-d for communication and facilitating cooperation between a packet-based network 501 and a circuit switched network 502 is illustrated.
  • Nodes “a” through “d” of the example are shown connected to each other for signaling and connection coordination purposes, while only nodes “a” and “d” are shown connected to an ATM network 501 for communication delivery retrieval.
  • FIG 6 an illustration of a node 601 for an embodiment of the present invention wherein telephone exchange hardware 602 operates in cooperation with Packet switched networking module 603 to communicate with and a packet switched network 604 and convert packet- and circuit-based communication is shown in Figure 6.
  • the telephone exchange 602 coordinates ISUP 605 between other nodes.
  • the packet switched networking module 603 facilitates cooperation between networks.
  • the packet switch networking module 603 communicates with the packet switch network and converts between packet transport protocols and voice transport.
  • FIG. 7 further an illustration of the packet switched networking module 603 is shown wherein a packet switched to circuit switched converter 701 and packet switched protocol module 702 is utilized to facilitate communication and cooperation between the packet switched network 703 and telephone exchange equipment 704.
  • a packet switched to circuit switched converter 701 and packet switched protocol module 702 is utilized to facilitate communication and cooperation between the packet switched network 703 and telephone exchange equipment 704.
  • Narrow band Network can be meshed or planned in a flexible way since there is no extra speech devices needed for a fully meshed network.

Landscapes

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

Abstract

L'invention concerne des procédés et un système de connexion de centraux à des réseaux à commutation par paquets, mettant en oeuvre des liaisons virtuelles. D'après un mode de réalisation de l'invention, un premier noeud (b) reçoit une indication depuis un noeud de départ (401, a) selon laquelle un appel doit être établi sur un dispositif physique entrant, le premier noeud (b) détermine la destination (404, d) de l'appel et saisit un dispositif virtuel sortant et le premier noeud (b) indique à au moins un noeud successif (c), en relation plus étroite avec la destination (404, d), qu'un appel doit être établi et fournit audit noeud (c) des informations de destination concernant ledit appel. Dans un autre mode de réalisation, on communique de manière répétée aux noeuds successifs (c) plus proches du noeud destination (404, d), jusqu'à ce qu'un noeud destination (404, d) soit informé de l'appel à établir sur un dispositif physique associé audit noeud destination.
EP00986677A 1999-12-27 2000-12-21 Procedes et systemes de connexion de centraux telephoniques a des reseaux a commutation par paquets via des liaisons virtuelles Withdrawn EP1243104A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US47252999A 1999-12-27 1999-12-27
US472529 1999-12-27
PCT/US2000/034851 WO2001048982A1 (fr) 1999-12-27 2000-12-21 Procedes et systemes de connexion de centraux telephoniques a des reseaux a commutation par paquets via des liaisons virtuelles

Publications (1)

Publication Number Publication Date
EP1243104A1 true EP1243104A1 (fr) 2002-09-25

Family

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Family Applications (1)

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EP00986677A Withdrawn EP1243104A1 (fr) 1999-12-27 2000-12-21 Procedes et systemes de connexion de centraux telephoniques a des reseaux a commutation par paquets via des liaisons virtuelles

Country Status (4)

Country Link
EP (1) EP1243104A1 (fr)
CN (1) CN1437817A (fr)
AU (1) AU2286801A (fr)
WO (1) WO2001048982A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100394735C (zh) * 2004-09-02 2008-06-11 西安大唐电信有限公司 基于No.7信令系统在信令链路上传送消息的方法
CN1822625B (zh) * 2005-12-07 2010-04-07 北京佳讯飞鸿电气股份有限公司 呼叫延伸系统及呼叫处理方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014337A1 (fr) * 1993-11-19 1995-05-26 Codex Corporation Procede de temporisation de lissage adaptatif pour des applications a paquets vocaux
GB2330034A (en) * 1997-10-01 1999-04-07 Northern Telecom Ltd A narrowband to broadband interface for a communications system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0148982A1 *

Also Published As

Publication number Publication date
CN1437817A (zh) 2003-08-20
WO2001048982A1 (fr) 2001-07-05
AU2286801A (en) 2001-07-09

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