WO2009049638A1 - Procédé et dispositif d'établissement d'une communication via un réseau - Google Patents

Procédé et dispositif d'établissement d'une communication via un réseau Download PDF

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Publication number
WO2009049638A1
WO2009049638A1 PCT/EP2007/008828 EP2007008828W WO2009049638A1 WO 2009049638 A1 WO2009049638 A1 WO 2009049638A1 EP 2007008828 W EP2007008828 W EP 2007008828W WO 2009049638 A1 WO2009049638 A1 WO 2009049638A1
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WO
WIPO (PCT)
Prior art keywords
routers
network
connection
inventory
transmission
Prior art date
Application number
PCT/EP2007/008828
Other languages
German (de)
English (en)
Inventor
Shahin Arefzadeh
Original Assignee
Dimetis Gmbh
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 Dimetis Gmbh filed Critical Dimetis Gmbh
Priority to PCT/EP2007/008828 priority Critical patent/WO2009049638A1/fr
Publication of WO2009049638A1 publication Critical patent/WO2009049638A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • 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
    • H04L45/24—Multipath
    • H04L45/243—Multipath using M+N parallel active paths
    • 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
    • H04L45/38—Flow based routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00—Encapsulation of packets
    • 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
    • H04L45/24—Multipath
    • H04L45/247—Multipath using M:N active or standby paths

Definitions

  • the invention relates to a method and apparatus for establishing a connection through a network. It is envisaged that data, in particular multimedia data or broadcast data such as IP-TV or the like data, which must be transmitted in a time-critical data stream, are transmitted from a feed point via the network to at least one receiving point. To this end, in the network, several routers establish a transmission tunnel between the feed-in point and the receiving point by detecting the characteristics of the routers in an inventory facility, and using the known properties of the routers through a traffic engineering facility Transmission tunnel is set up by several running between individual routers tunnel sections.
  • Routers in the context of the application refer to both coupling systems which interconnect two or more subnetworks at the network layer of the transmission protocol, as well as other network components (for example switches) which execute switching functions. These switching functions can also be switching functions in wide area networks or local area networks.
  • telecommunications networks mostly proprietary transport networks are increasingly used for the transmission of multimedia data, so-called broadcast data.
  • conventional transmissions on the Internet for example in the form of HTML pages, e-mails, simple data downloads or the like
  • there are high demands on the transmission network in the transmission of multimedia data. plant. in particular with regard to the very large amount of data transmitted in critical temporal relation to one another, to very short-term connections, to the requirement of a high quality of transmission (QoS) and / or to point-to-multipoint connections.
  • QoS quality of transmission
  • the typical problem known in telecommunications is that of a Connection is statically established based on an end-user request from a first to a second location in an autonomous environment associated with a single network operator.
  • the traffic engineering devices used for this purpose can not fulfill the dynamic requirements described above for networks which are to transmit multimedia data.
  • most traffic engineering facilities are hardware-dependent and can not be generalized because they directly address the hardware of the connected routers.
  • the network 1 shown there as a cloud is a transmission network within which all requirements of the traffic engineering device are handled proprietarily and statically in the sense that a connection is set up over a comparatively long period of several hours or days.
  • An end user 2 for example a transmission company, who wishes to transmit multimedia data from a transmitting station to a customer, announces the need in good time (eg live transmission of a sporting event) and has only access to the feed point 3 and the receiving point 4 of the available
  • the end-user 2 can not look into the autonomous system of the network 1 with the routers 5 present therein, nor is the traffic engineering at all able to meet special requirements take into account the transmission of multimedia data and monitor it in a timely manner.
  • an end-to-end tunnel 6 is constructed between the feed point 3 and the receiving point 4, the structure of which is statically predetermined by a traffic engineering device. It is also often the case in these static networks that due to the use of different hardware (router 5) only certain connections with mutually compatible hardware are set, since the traffic engineering device is not able to suitably address the various hardware.
  • the user has no possibility at all to influence the formation of the end-to-end tunnel 6, whose internal structure remains hidden to the end user 2.
  • a static tunnel setup takes place, which creates a continuous connection 7 between the entry and the exit point, which indeed takes place via the routers 5 shown in FIG. 3, but without their properties being retrievable during the connection and for a quality optimization would be available.
  • the object of the present invention is therefore to propose a method and a device of the type mentioned above for setting up a connection, which is particularly suitable for transmitting multimedia data, can be flexibly configured and allows monitoring of the transmission quality.
  • an interface device provided between the inventory device and the routers which can also be referred to as activation / discovery device or activation layer, in a direct query at the routers currently available in the router bandwidth queries and forwarded directly to the Inventory Facility.
  • the inventory facility is in connection with the traffic engineering facility, so that the latter each knows the currently available bandwidths of the individual routers in the network.
  • the traffic engineering device operates independently of hardware in the network, since the hardware-dependent communication with the routers of the network is performed by the proposed interface device. This allows the traffic engineering facility to monitor the transmission tunnel in the network used and to dynamically set up or interrupt the transmission tunnel and / or individual tunnel sections between the system's routers or switches. This is achieved by making the network transparent, in particular by querying the current bandwidths of the routers for the end user or the traffic engineering device.
  • the traffic engineering device via the interface device with different routers and possibly even multiple proprietary networks can communicate simultaneously, the interface device each uses the proprietary, hardware-based data protocols to address the individual router or network components and the information in an information system independent of a special hardware to the traffic engineering facility.
  • QoS quality of service
  • the interface device determines the data in real time, ie queries the required information directly at the routers and - apart from a short data conversion time, which does not matter further - immediately forwards the inventory device , This is achieved by the targeted selection of only the data required for fast connection setup, which can be queried in particular partially in parallel at multiple routers simultaneously.
  • This up-to-date information is combined with existing status in the inventory facility to provide up-to-date overall network status relevant to the transmission of multimedia data.
  • the interface device in addition to querying the status of the router, also configures the routers for setting up the transmission or connection tunnel and / or the individual tunnel sections.
  • a hardware-dependent interface is provided, which is set up to address and set up different routers or other hardware components provided in the network and required for setting up a connection, such as switches or the like.
  • the higher-level devices can work independently of hardware and thus enable a hardware-independent establishment of connections through the network. Due to this configuration option, point-to-multipoint connections can also be established quickly if required and canceled again after the required transmission time.
  • the inventory device can thus register and collect the physical and logical existence of the network or of the individual network components.
  • the network can be a single, proprietary network of a provider or a networked structure of several, proprietary networks, which are interconnected to produce an end-to-end or end-to-multi-end connection.
  • the inventory device can already be hardware-independent and model-based, ie it maps a model of the network in real time and thus enables dynamic access to the network through the traffic engineering facility accessing the inventory facility.
  • the traffic engineering device also works with a hardware-independent model that is based on a set of rules that can also be partially configured by an end user.
  • a hardware-independent model that is based on a set of rules that can also be partially configured by an end user.
  • the traffic engineering facility can thus spontaneously establish a connection to a demand occurring with the end user and terminate it again upon termination.
  • system resources can be used more spontaneously than in a quasi-stationary system, where large transmission capacities required must be announced hours or days in advance to ensure transmission of sufficient quality (static approach).
  • the transparency of the network achieved by accessing the routers according to the invention also has the advantage that the inventory device, the Interface device and / or the router in an established connection through the network can check the transmission quality in the transmission protocol, in particular on the basis of individual data packets. As a result, a quality of service (QoS) can be realized simultaneously with the dynamic connection setup.
  • QoS quality of service
  • the verification of the transmission quality can also be parameterized by the end user and transmitted to the traffic engineering device, the interface device and / or the router, for example by defining a so-called service level agreement (SLA) on each router a connection (transmission tunnel).
  • SLA service level agreement
  • the service level agreement can be, for example, a request for the maximum lost data packets from one router to the next.
  • the traffic engineering device establishes one or, if appropriate, several parallel connections during the connection setup in the network, to which, if necessary, in other words. for example, when breaking down the original connection, can be switched immediately.
  • the parallel connection in this case corresponds to a backup or secondary connection.
  • the invention also relates to a device for establishing a connection through a network, which is set up in particular for carrying out the method described above.
  • the network accessed by the device is equipped with multiple routers for establishing a transmission period. built between a feed point and at least one ErnpfangssteNe.
  • the device according to the invention has an inventory device for recording the properties of the routers and a traffic engineering device for setting up the tunnel sections of the transmission tunnel running between the individual routers. Between the inventory device and the routers, an interface device is provided, which is set up to directly query the bandwidth currently available at the routers.
  • a configuration of the routers can also take place at the same time by the interface device.
  • the interface device preferably has a hardware-dependent interface for connection to the routers and a hardware-independent interface for connection to the inventory device.
  • the inventory device or the entire device for setting up a method becomes almost real-time capable (real-time) and allows extremely fast access to the inventory data of the network.
  • the traffic engineering device, the inventory device, the interface device and / or the router has a checking device for checking the connection between the routers.
  • This checking device can be set up in the event of disruptions or insufficient quality of the connection for initiating the establishment of a new connection, in particular by means of a corresponding message to the traffic engineering device, which then sets up a new connection and / or switches to a parallel connection.
  • the data streams traversing each router can also be detected and analyzed electronically, in particular in the case of an Internet Protocol (IP) -based data stream.
  • IP Internet Protocol
  • the electronic content of the data streams can be used to determine and analyze their content. This also allows the automatic detection of content-related errors. An appropriate message to the traffic engineering institution can then be triggered in the event of a substantive error.
  • end-to-end tunnels which are also referred to in the multi-protocol label switching technology as VLAN and / or secure VPN connections, can be dynamically assigned by one End-users are requested. This makes it possible to analyze the request of an end user and to set up the requested transmission tunnel (s) dynamically and in (quasi) real-time.
  • the proposed technology can be used both as a point-to-point connection and as a point-to-multipoint connection.
  • Figure 1 is a diagram of a device according to the invention for establishing a connection through a network.
  • Fig. 2 is a snapshot of the network
  • Fig. 3 is a previously known from the prior art network.
  • a conventional network 1 is shown, which allows an end user 2 to establish a connection through the network, in particular multimedia data from a feed point 3 to a receiving point 4 can be transmitted.
  • the end user 2 supplies, for example, the feed point 3 directly with the data to be transmitted, which are forwarded by the receiving point 4 to a customer of the end user.
  • the connection between the feed-in point 3 and the receiving point therefore forms an end-to-end tunnel 6 through which its data can be transmitted.
  • data can also be transmitted from a common feed point 3 to a plurality of receiving points 4 simultaneously.
  • the end-to-end tunnel 6, which is shown schematically below the network, is reached by a continuous connection between the feed-in point 3 and the receiving point 4, designated as transmission tunnel 7, which is switched through by routers 5 arranged within the network 1.
  • transmission tunnel 7 which is switched through by routers 5 arranged within the network 1.
  • tunnel sections 8 are set, which interconnected the form the entire transmission tunnel 7.
  • the construction is carried out by a traffic engineering device 9, which builds the transmission tunnel 7 according to rules defined or definable by setting up the tunnel sections 8 between the individual routers 5.
  • the knowledge about the properties and connectivity between the routers 5 of the network is obtained by communication with a user.
  • Stand recording device 10 in which the properties and states of each router 5 are stored.
  • the traffic engineering device 9 also accesses the router 5 arranged in the network 1 via the inventory device 10, since in this way the connection setup of a transmission tunnel 7 can be immediately recorded in the inventory device 10, which thus has a current network status.
  • the traffic engineering device 9 and the inventory device 10 work according to hardware-independent rule sets, so that the communication with the actual hardware of the network 1, i. the routers 5 or switches in the network 1 takes place via an interface device 11, which has a hardware-independent interface 12 for a higher-level transmission protocol and a hardware-dependent interface 13 to the individual routers of the system.
  • the entire communication takes place in the logical level above the interface device 11 by hardware-independent interfaces 12, which also allows a simple connection of the end user 2 to the traffic engineering device 9, so that these requirements for the desired end-to-end connection 6 to the traffic engineering device 9 can transmit.
  • the inventory device 10 contains, in particular at the time of a required connection setup, the essential properties of the routers 5 within the network 1, which determine the transmission capacity and quality, in real time. This allows the traffic engineering system in turn, to switch on a request of the end user 2 flexible a desired continuous connection 7 between a feed-in point 3 and a receiving point 4.
  • the interface device 11 which is also referred to as the activation / discovery device, can ultimately collect configuration and status data of the routers 5 at the instigation of an end user 2 and configure each device provided within the network 1 for establishing the connection, in particular the routers 5.
  • the interface device 11 forms the transition from a general rule set based configuration system with the inventory device 10 and the traffic engineering device 9 to the hardware used in the network 1, in particular the routers 5.
  • the interface device 11 is set up to retrieve from the various routers 5 only selectively and for a fast connection required data, so that the traffic engineering facility 9 in a request by an end user 2 has the necessary information for the connection of the network 1 in real time.
  • these selective data include the current bandwidth of routers 5 provided in network 1. This information is available in a matter of seconds, whereas in traditional inventory facilities, which sequentially poll the overall status of all routers in the network, this information is collected within hours because most of the entire network status is istsacnnt.
  • the interface device 11 with the hardware-dependent interface 13 can also be set up to address several or all routers 5 supplied by it within the network 1 in parallel. This is achieved in particular by the fact that only the interface device 11 has a has hardware-based interface 13 and communicates with the higher-level organizational system levels via a hardware-independent interface 12.
  • the traffic engineering device 9 and the inventory device 10 can be used to build a hardware-independent and model-based real-time system that collects all the physical and logical properties of a private network and reproduces its dynamic state in real time. Therefore, the proposed system according to the invention is particularly suitable for establishing connections for the transmission of multimedia data.
  • the process of establishing a connection will be explained again below.
  • the end user 2 sends via the hardware independent interface 12 as needed, i. dynamically, a connection request between a feed-in point 3 and a receiving point 4 to the traffic engineering device 9, while he can specify certain transmission qualities, for example, as a parameter at the same time.
  • the traffic engineering device 9 calculates and generates quasi real-time the desired end-to-end tunnel 6 between the feed point 3 and the receiving point 4. For this purpose, the traffic engineering device 9 initiates the recording of a current one Status in the inventory device 10, which causes the interface device 11 to query the currently available bandwidth of the individual routers 5 and possibly a few more, needed for the connection setup information at the routers 5 and in the inventory device 10 to which updates the logical current state of the system and displays the current state of the traffic engineering device 9. Based on this, the traffic engineering device 9 then calculates a suitable transmission tunnel 7 by determining the tunnel sections 8 between the respective routers 5 in such a way that the transmission quality desired by the end user 2 can also be maintained.
  • This configuration is passed through the inventory device 10 and the interface device 11 to the routers 5. Thereupon, the end-to-end tunnel 6 can be used by the end user 2.
  • the system consisting of traffic engineering device 9, inventory device 10 and interface device 11 also has a monitoring device of the existing connection, so that in case of problems a recalculation of the connection can take place.
  • FIG. 2 signals a problem with the router 5 at the location S2, which is recognized by the interface device 11.
  • the traffic engineering device 9 then switches the tunnelled section 8 at the point S1 to the new tunnel section 8 at the point S3, so that the connection is established via a bypass router 5.
  • a bypass router can be defined for each router 5 already when setting up a connection, so that in case of an error before a recalculation, this bypass router can first be tried out. A complete recalculation of the connection tunnel 7 is then not necessary.

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

Abstract

L'invention concerne un procédé et un dispositif d'établissement d'une communication via un réseau (1), procédé selon lequel des données doivent être transmises d'un point d'alimentation (3) à au moins un point de réception (4) via le réseau (1). A cet effet, un tunnel de transmission (7) entre le point d'alimentation (3) et le point de réception (4) est établi dans le réseau (1), via plusieurs routeurs (5), les propriétés des routeurs (5) étant enregistrées dans un dispositif inventaire (10), et un dispositif d'ingénierie de trafic (9) établissant le tunnel de transmission (7) par plusieurs sections de tunnel (8) s'étendant entre les routeurs individuels (5), en utilisant les propriétés connues des routeurs (5). L'invention a pour but d'obtenir un établissement dynamique d'une communication et de pouvoir contrôler la qualité de la transmission. A cet effet, l'invention est caractérisée en ce qu'il est prévu entre le dispositif inventaire (10) et les routeurs (5), un dispositif d'interfaces (11) qui interroge directement les routeurs (5) relativement à la largeur de bande actuellement disponible dans un routeur (5) et transmet immédiatement la largeur de bande actuellement disponible au dispositif inventaire (10).
PCT/EP2007/008828 2007-10-11 2007-10-11 Procédé et dispositif d'établissement d'une communication via un réseau WO2009049638A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/008828 WO2009049638A1 (fr) 2007-10-11 2007-10-11 Procédé et dispositif d'établissement d'une communication via un réseau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/008828 WO2009049638A1 (fr) 2007-10-11 2007-10-11 Procédé et dispositif d'établissement d'une communication via un réseau

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WO2009049638A1 true WO2009049638A1 (fr) 2009-04-23

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030165114A1 (en) * 2002-03-04 2003-09-04 Hitachi, Ltd. Communication path monitoring system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030165114A1 (en) * 2002-03-04 2003-09-04 Hitachi, Ltd. Communication path monitoring system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
AKYILDIZ I F ET AL: "TEAM: a traffic engineering automated manager for diffserv-based MPLS networks", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER, PISCATAWAY, US, vol. 42, no. 10, October 2004 (2004-10-01), pages 134 - 145, XP011120086, ISSN: 0163-6804 *
KUSMIEREK E ET AL: "An integrated network resource and QoS management framework", IP OPERATIONS AND MANAGEMENT, 2002 IEEE WORKSHOP ON 29-31 OCT. 2002, PISCATAWAY, NJ, USA,IEEE, 29 October 2002 (2002-10-29), pages 68 - 72, XP010611950, ISBN: 0-7803-7658-7 *
TORSTEN BRAUN ET AL: "Management of Quality of Service Enabled VPNs", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER, PISCATAWAY, US, vol. 39, no. 5, May 2001 (2001-05-01), pages 90 - 98, XP011091720, ISSN: 0163-6804 *

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