WO2000062489A1 - Acheminement entre reseaux de communication - Google Patents

Acheminement entre reseaux de communication Download PDF

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Publication number
WO2000062489A1
WO2000062489A1 PCT/FI2000/000324 FI0000324W WO0062489A1 WO 2000062489 A1 WO2000062489 A1 WO 2000062489A1 FI 0000324 W FI0000324 W FI 0000324W WO 0062489 A1 WO0062489 A1 WO 0062489A1
Authority
WO
WIPO (PCT)
Prior art keywords
routing
switched network
controller
network
accordance
Prior art date
Application number
PCT/FI2000/000324
Other languages
English (en)
Inventor
Esa Turtiainen
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU41216/00A priority Critical patent/AU4121600A/en
Publication of WO2000062489A1 publication Critical patent/WO2000062489A1/fr

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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/42—Centralised routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/10—Mapping addresses of different types
    • 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
    • H04L65/104—Signalling gateways in the network
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/64—Distributing or queueing
    • H04Q3/66—Traffic distributors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13141—Hunting for free outlet, circuit or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13166—Fault prevention
    • 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
    • H04Q2213/13209—ISDN
    • 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 present invention relates to a method of routing in telecommunication networks, and more precisely to a method of routing between a telephone network and a data network.
  • the invention relates further to an arrangement for performing the routing operations between two different networks .
  • An interfacing gateway or access node is required in the communication path or route between two different communication networks.
  • an interfacing access node is required in cases where the other network is a telephone network, such as a Public Switched Telephone Network (PSTN) and the other network is a data network, such as a packet switched data network (PSDN) .
  • PSTN Public Switched Telephone Network
  • PSDN packet switched data network
  • packet switched networks include the global connectionless Internet utilising TCP/IP (Transport Control Protocol/Internet Protocol) protocol suite and various Intranet applications.
  • NAS Network Access Server
  • At least some degree of routing functionality is required in the communication network system for the transmission of the data packets over the data network in order to be able to sent the data packets to a correct next router and finally to a correct destination address.
  • This functionality is usually integrated to the NAS, or then all traffic goes through a separate router especially and solely arranged to accomplish the routing tasks. Routing protocols based on international agreements are used in order to be able to provide this functionality. The routing protocols are used to adapt dynamically to the variations in networks structures and also to the possible failures occurring during various stages of transmission of the data packets.
  • the routing protocols like OSPF (Open Shortest Path First) and BGP (Border Gateway Protocol) , are substantially complex and do not suit especially well to simple network elements the NAS otherwise would utilise.
  • OSPF Open Shortest Path First
  • BGP Border Gateway Protocol
  • routing causes one extra step, and every packet has to be handled still once in the NAS. This may cause delays in the traffic and increases the risk for failures.
  • MG Media Gateway Controller
  • a MG typically contains only one generic DSP (Digital Signal Processor) that can be programmed dynamically to form a modem or a voice over IP codec. This simplifies the structure of the MG (i.e. the access node for media) a lot, but does not solve the routing problem.
  • DSP Digital Signal Processor
  • Another object of the present invention is to provide a method and arrangement by means of which the structure of the access node can be made less complex and unnecessary double processing of the data packets can be avoided.
  • the objects are obtained by a method of routing a call between a circuit switched network and a packet switched network in a network system comprising a media gateway between the circuit switched network and the packet switched network, wherein routing procedures for the call are handled by a separate routing controller common for several media gateways.
  • the routing controller can give routing information to an appropriate media gateway concerning the destination of the call traffic.
  • the routing information may comprise the IP interface to be used and the IP address of the next router in the packet switched network.
  • the routing controller for the packet switched network and signalling controller for the circuit switched network may also form a symmetric structure relative to the media gateway. The call can originate both from the circuit switched network side and the packet switched network side.
  • the invention provides an arrangement in a communication network system comprising: a circuit switched network; a packet switched network; a plurality of media gateways between the networks; a signalling controller for handling circuit switched traffic; and a separate routing controller for handling packet switched traffic routing, said separate routing controller being common to said plurality of media gateways.
  • the routing controller and the signalling controller can form a symmetric structure relative to the media gateway.
  • the plurality of media gateways can also be arranged in a stack.
  • the invention provides a routing controller for a communication network system comprising a circuit switched network, a packet switched network, a plurality of media gateways between the networks, and a signalling controller for handling circuit switched traffic, wherein the routing controller is arranged to form a separate routing controller for handling packet switched traffic routing such that said separate routing controller is common to said plurality of media gateways.
  • the solution provides a simplified structure for the media gateway between different communications networks. Since the required media gateway apparatus is less complex than in the prior art solutions, it is thus economically more advantageous and also more reliable in use and less vulnerable for hardware and/or software failures.
  • the proposed solution does not have any disadvantageous effects in the performance or functionality of the system since the traffic is separated to different outgoing interfaces.
  • the proposed system adapts well to any dynamic changes in the network system. In addition, by means of the invention it becomes more easy to stack media gateway units to a tight space.
  • Figure 1 is a schematic presentation of network system including a telephone network and a data network and linking apparatus there between;
  • Figure 2 discloses signalling flow according to one embodiment of the present invention.
  • FIG. 1 is a schematical presentation of one network system including a PSTN 1, IP network 2 (e.g. the TCP/IP Internet or an intranet application) and an access node or a gateway apparatus therebetween.
  • IP network 2 e.g. the TCP/IP Internet or an intranet application
  • the arrows indicate the signalling directions in situation where a call has been initiated by a terminal of the PSTN (not shown) .
  • the gateway apparatus comprises a plurality of media gateways 3, 3', a signalling gateway SG (for SS7 to ISUP over IP conversion) and media gateway controller MGC handling call related control 4.
  • Each MG 3,3' may contain only one generic DSP (Digital
  • the structure of the MG can be made substantially simple, which reduces remarkably the costs of the MG and also increases the reliability of the MG .
  • the MGs can be stacked in a substantially tight space in a manner similar to ordinary telephone exchanges. It is noted that even though figure 1 discloses only two MGs, the number of them could be substantially higher.
  • the gateway apparatus is further provided with a separate routing controller RC 5, the arrangement being such that the routing is separated similarly to the signalling gateway and media gateway controller 4 to the routing controller 5.
  • the system is "symmetric" relative to the MGs in view of the PSTN and the IP network.
  • the former access servers are now simplified to form only media gateway units 3,3' .
  • the routing controller unit 5 is common for several media gateway units 3,3'.
  • the routing controller 5 is arranged to communicate to the IP network 2 by using appropriate routing protocols, such as the OSPF and the BGP, and to give required routing orders to the particular media gateway unit 3 or 3' .
  • the main information required by the particular media gateway is the current situation concerning the destination of the traffic originating in the PSTN side and coming via a certain PSTN line.
  • the required information typically consists of indication of correct IP interface which should be used and the IP address of the next router (i.e. the next "hop" in the data network).
  • OSPF routing protocol RRC2178
  • IP protocol 89 IP protocol number 89
  • All those IP packets that are coming to the media gateway MG and are of protocol 89 are tunnelled to the routing controller RC .
  • the routing controller 5 sees all MG interfaces as its own interfaces, and when something is sent to a RC interface, it is tunnelled to the MG and sent there.
  • OSPF packets There are 5 types of OSPF packets and they all must fit in to an IP packet of size of 576 bytes (in case operated according to RFC2178 appendix A) .
  • RIP RRC1723
  • UDP based protocol a transport level datagram layer above the IP layer, port 520.
  • a similar tunnelling approach works in this as well when the traffic from UDP port 520 is forwarded to the routing controller.
  • the media gateway MG unit can be made as simple as possible by removing both IP routing handling and call control from it. This does not affect negatively to the performance or the functionality of the system because the traffic is separated to different outgoing ("egress") interfaces in a manner similar to a router.
  • the system also adapts to any dynamic changes in the network in a manner similar to a router .
  • the PSTN users often have a dynamically assigned IP address.
  • the RC must "advertise" (i.e. announce) these addresses so that the other routers of the system are enabled to transmit the data packets to a correct MG .
  • an PSTN user can have a known IP network address or a subnet of an IP network.
  • the RC can call back to the PSTN telephone number associated with this IP address when somebody tries to reach said IP address from the IP network side.
  • this case will be like the one already discussed above.
  • the RC advertises routes to the fixed network addresses even in instances where the connections are down i.e. disconnected.
  • the RC can accomplish this by using one, some or available ports based on local policy (for instance, some MGs may be closer to the destination in the PSTN) .
  • the MG routes it to a special dynamic interface that makes the SG to set-up the requested telephone call. This may involve utilisation of one additional server, e.g. an AAA server (Authentication, Authorisation and Accounting server; most often used protocol for an AAA server being RADIUS) that maintains customer information in a database which is common for the SC and the RC .
  • AAA server Authentication, Authorisation and Accounting server
  • FIG. 2 discloses signalling flows 11 to 13 (numbers in circles) for the above described solution.
  • the AAA server 7 defines fixed routes and the RC 5 controls that the MG 3 becomes advertised of the addresses and sets up the MG 3 to start a connection should a data packet arrive.
  • a data packet arrives, whereafter the MG 3 contacts SG/MGC 4 in order to establish a connection.
  • SG 4 ask for a telephone number from the AAA server 7 and establishes the connection to that number.
  • the MG 3 forwards the data packet to the established connection 13.
  • it In case the same route is advertised in many MGs, it must in most cases be ensured that only one connection is established at the same time. However, there may be instances where it could be desirable to establish several connections, e.g. such that the user can receive several calls at the same time and/or that the bandwidth is increased by this and/or that the call may go to many geographical locations at the same time.
  • the invention provides an apparatus and a method by which a significant improvement can be achieved in the area of routing between different networks. It should be noted that the foregoing exemplifying embodiments of the invention are not intended to restrict the scope of the invention to the specific forms presented above but the present invention is meant rather to cover all modifications, similarities and alternatives which are included in the spirit and scope of the present invention, as defined by the appended claims.

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

Abstract

Cette invention a trait à une méthode d'acheminement d'un appel entre un réseau à commutation de circuit et un réseau à commutation de paquets dans un système en réseau comprenant une passerelle pour supports entre le réseau à commutation de circuit et le réseau à commutation de paquets. Dans le cadre de cette méthode, toutes les modalités d'acheminement de l'appel sont prises en charge par une unité de commande d'acheminement commune à plusieurs passerelles pour supports. L'invention porte également sur un dispositif permettant la mise en oeuvre de cette méthode.
PCT/FI2000/000324 1999-04-14 2000-04-14 Acheminement entre reseaux de communication WO2000062489A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41216/00A AU4121600A (en) 1999-04-14 2000-04-14 Routing between communication networks

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990827 1999-04-14
FI990827A FI107099B (fi) 1999-04-14 1999-04-14 Tietoliikenneverkkojen välinen reititys

Publications (1)

Publication Number Publication Date
WO2000062489A1 true WO2000062489A1 (fr) 2000-10-19

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PCT/FI2000/000324 WO2000062489A1 (fr) 1999-04-14 2000-04-14 Acheminement entre reseaux de communication

Country Status (3)

Country Link
AU (1) AU4121600A (fr)
FI (1) FI107099B (fr)
WO (1) WO2000062489A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380894A (en) * 2001-10-09 2003-04-16 Orange Personal Comm Serv Ltd Monitoring resources available at gateways and selecting a gateway controller
WO2003041362A2 (fr) * 2001-11-02 2003-05-15 Qualcomm Incorporated Systeme et procede permettant d'acheminer des appels voix sur ip
WO2005013572A2 (fr) * 2003-07-31 2005-02-10 Siemens Aktiengesellschaft Systeme et procede de convergence des communications commutees par circuit et commutees par paquets

Citations (6)

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EP0474427A1 (fr) * 1990-09-04 1992-03-11 AT&T Corp. Procédé pour l'attribution dynamique d'adresses dans un réseau de communications
US5546452A (en) * 1995-03-02 1996-08-13 Geotel Communications Corp. Communications system using a central controller to control at least one network and agent system
WO1997028628A1 (fr) * 1996-01-31 1997-08-07 Labs Of Advanced Technologies International Corporation Reseau hybride pour communications vocales en temps reel d'un poste telephonique a un autre
EP0880255A2 (fr) * 1997-05-20 1998-11-25 Nortel Networks Corporation Système et méthode pour l'accès à distance à un système de commutation téléphonique utilisant des réseaux avec protocole Internet
WO1999062242A1 (fr) * 1998-05-29 1999-12-02 3Com Corporation Procede et appareil de telephonie par internet
JP2000022735A (ja) * 1998-07-06 2000-01-21 Nec Eng Ltd Ｌａｎ間接続装置及びそれに用いる経路選択方法並びにその制御プログラムを記録した記録媒体

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0474427A1 (fr) * 1990-09-04 1992-03-11 AT&T Corp. Procédé pour l'attribution dynamique d'adresses dans un réseau de communications
US5546452A (en) * 1995-03-02 1996-08-13 Geotel Communications Corp. Communications system using a central controller to control at least one network and agent system
WO1997028628A1 (fr) * 1996-01-31 1997-08-07 Labs Of Advanced Technologies International Corporation Reseau hybride pour communications vocales en temps reel d'un poste telephonique a un autre
EP0880255A2 (fr) * 1997-05-20 1998-11-25 Nortel Networks Corporation Système et méthode pour l'accès à distance à un système de commutation téléphonique utilisant des réseaux avec protocole Internet
WO1999062242A1 (fr) * 1998-05-29 1999-12-02 3Com Corporation Procede et appareil de telephonie par internet
JP2000022735A (ja) * 1998-07-06 2000-01-21 Nec Eng Ltd Ｌａｎ間接続装置及びそれに用いる経路選択方法並びにその制御プログラムを記録した記録媒体

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Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380894A (en) * 2001-10-09 2003-04-16 Orange Personal Comm Serv Ltd Monitoring resources available at gateways and selecting a gateway controller
WO2003041362A2 (fr) * 2001-11-02 2003-05-15 Qualcomm Incorporated Systeme et procede permettant d'acheminer des appels voix sur ip
WO2003041362A3 (fr) * 2001-11-02 2003-08-21 Qualcomm Inc Systeme et procede permettant d'acheminer des appels voix sur ip
US6813264B2 (en) 2001-11-02 2004-11-02 Qualcomm, Incorporated System and method for routing voice over IP calls
WO2005013572A2 (fr) * 2003-07-31 2005-02-10 Siemens Aktiengesellschaft Systeme et procede de convergence des communications commutees par circuit et commutees par paquets
WO2005013572A3 (fr) * 2003-07-31 2005-04-21 Siemens Ag Systeme et procede de convergence des communications commutees par circuit et commutees par paquets

Also Published As

Publication number Publication date
FI990827A0 (fi) 1999-04-14
FI107099B (fi) 2001-05-31
AU4121600A (en) 2000-11-14
FI990827A (fi) 2000-10-15

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