WO2005112415A1 - Procede pour etablir une liaison de communication - Google Patents

Procede pour etablir une liaison de communication Download PDF

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Publication number
WO2005112415A1
WO2005112415A1 PCT/EP2005/051503 EP2005051503W WO2005112415A1 WO 2005112415 A1 WO2005112415 A1 WO 2005112415A1 EP 2005051503 W EP2005051503 W EP 2005051503W WO 2005112415 A1 WO2005112415 A1 WO 2005112415A1
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WO
WIPO (PCT)
Prior art keywords
network
communication terminal
zone
lan1
codec
Prior art date
Application number
PCT/EP2005/051503
Other languages
German (de)
English (en)
Inventor
Achim Ackermann-Markes
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005112415A1 publication Critical patent/WO2005112415A1/fr

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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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS

Definitions

  • the invention relates to a method and a communication terminal for establishing a communication connection.
  • the invention relates in particular to the selection of a codec suitable for the communication link.
  • codec compression-decompression
  • a codec is understood to mean the principle of compressing uncompressed video and / or audio information according to a defined algorithm and being able to decompress the compressed video and / or audio information again.
  • Various codecs are used in telecommunications for the compression of video and / or audio information.
  • the codecs H.263 or MPEG-4 are used.
  • different codecs are used for audio or voice communication.
  • the G.711 codec supports a bandwidth of 64 kB / s and is used to achieve ISDN voice quality.
  • the G.723.1 codec offers less bandwidth, but it also has a longer delay and poorer voice quality.
  • the G729a / b codec offers a lower delay.
  • Another codec, G.722 is suitable for supporting a "HiFi quality" of the audio information.
  • Each codec has its own characteristics with regard to its bandwidth requirements and its transmission quality, but in general the quality of the video deo and / or audio information with the bandwidth requirement and falls with the degree of compression.
  • codecs are used in particular for the transmission of communication data over packet-oriented networks. Such a transmission is often referred to in the professional world as VoIP (Voice over IP).
  • VoIP Voice over IP
  • two end points involved in the communication choose one in consultation with one another and, if appropriate, with a further instance for a transmission of user data - i.e. Audio or video information - appropriate codec.
  • Such a codec determined by agreement when a communication connection is set up is not an optimal codec for this communication connection.
  • a codec that is suitable for a first network with a high transmission bandwidth and is characterized by low compression with a simultaneous high bandwidth requirement will cause an incorrect transmission of the user data when used in a communication connection in a second network with a limited transmission bandwidth.
  • a codec that is more suitable in this second network with higher compression and thus lower required transmission bandwidth is used with respect to the quality when used for a communication connection in the first network.
  • tat of the transmitted user data lie within a limit specified for this high-compression codec.
  • the bandwidth available in the first network would allow the use of a less strongly compressing codec with a higher bandwidth in order to achieve a higher quality of the user data exchanged with the communication link.
  • the object of the invention is to provide means by which a communication link is set up while avoiding the above-mentioned problems or loss of quality.
  • the invention is based on a first communication terminal - for example a VoIP telephone or a computer system, e.g. Workstation computer - which is connected to a packet-oriented network for the exchange of data.
  • the packet-oriented network is divided into individual network zones in the usual way.
  • a zone can e.g. consist of one or more iP subnets in an iP network.
  • a characteristic of a zone is that there is enough bandwidth available for real-time communication even without a compression algorithm.
  • a zone can therefore consist of a LAN (Local Area Network) or several LANs that are networked via high-bandwidth WAN connections (Wide Area Network).
  • close or “local” and “far” used in the following do not necessarily correspond to the usual topological view (as far as they can be used in networks), but define a neighborhood to an end point via the transmission hand width, which is assured in communication with it or which can be achieved on average.
  • a zone is local or neighboring, which a communication or. Data connection with high transmission bandwidth permitted.
  • a network address of a second communication terminal to be called is first obtained from the calling first communication terminal.
  • a comparison of the related network address of the second communication terminal with the network address assigned to the first communication terminal and its network mask enables an assessment of a network topological relationship of the second network zone connected to the second communication terminal.
  • a codec to be used for the communication connection is selected on the basis of the network topological relationship determined.
  • An essential feature of the method according to the invention is that the codec to be used for the communication connection is selected on the basis of a network topological relationship of the two communication terminals involved in this communication connection.
  • the network topological relationship here means in particular the assignment of the zone of the second communication terminal called in relation to the zone of the first communication terminal calling, on the basis of which a criterion for the selection of the codec is derived.
  • the method according to the invention is based on the idea that more distant zones suggest a codec with higher compression than zones which are in the immediate vicinity or even a logical component of the current zone.
  • the term network topology includes the range of the zone to which the communication link is to be established and the “neighborly” relationship to the current zone.
  • a particular advantage of the method according to the invention is a codec which is adapted to the conditions of the communication connection and which makes an optimal compromise between the available bandwidth and the highest possible transmission quality.
  • the zone in which the second communication terminal is located is identical to the first network zone or whether the second network zone is outside the first network zone.
  • This embodiment of the method according to the invention is advantageously associated with the least effort, since the information required for this, namely the network address of the two communication terminals and the network mask of the first communication terminal must be available for packet-oriented communication anyway, but has not hitherto been available for an assessment of the network topological situation were used to select a suitable codec.
  • entries are kept in the communication terminals which are used for a more precise analysis of the network topological situation. These entries are used, for example, by a network administration System related. These entries are advantageously obtained when a network address is assigned or transmitted for the respective communication terminal, for example in conjunction with a DHCP method (Dynamic Host Control Protocol). These entries include, for example, a list of network addresses or address ranges, by means of which a more precise assessment of zones is possible which are topologically to be regarded as "close”, in which data traffic with a higher bandwidth is therefore possible.
  • DHCP method Dynamic Host Control Protocol
  • FIG. a structure diagram for the schematic representation of a communication system with individual network zones
  • the only FIG shows a communication system CSY with a packet-oriented network NW.
  • the packet-oriented network NW is composed of several network zones LAN1, LAN2, LAN3, ANl, WAN2.
  • a first local network zone LAN1 is connected to a second local network LAN2 via a first connection CN1.
  • the second local area network LAN2 is in turn a zone of a first wide area network WAN1, which is connected to a second wide area network WAN2 via a second connection CN2.
  • a third local area network LAN3 is connected to the second wide area network WAN2 via a third connection CN3 and to the first local area network LAN1 via a fourth connection CN4.
  • packet-oriented networks include LANs (Local Area Network), MANs (Metropolitan Area Network), WANs (Wide Area Network) or the so-called Internet, which enables worldwide access to packet-oriented data.
  • Internet telephony for example, is often based on packet-oriented telecommunications technology and is often also referred to as “Voice over Internet Protocol” (VoIP).
  • VoIP Voice over Internet Protocol
  • a virtual LAN or VLAN is formed by a group of network nodes that are combined in an autonomous domain or “broadcast domain”.
  • the affiliation of a network node to a VLAN does not depend on the location of the network node. It is determined exclusively by software configuration and can be changed if a network node is to be assigned to a new work group.
  • NW packet-oriented network
  • a first communication terminal TP1 is connected to the first local network LAN1 and a second communication terminal TP2 is connected to the third local network LAN3.
  • the communication terminals TP1, TP2 mentioned in the present exemplary embodiment are assumed to be VoIP communication terminals or “IP telephones”, the method according to the invention can also be applied to data terminals TP1, TP2, which are used either for communication purposes or for the purpose of Exchanges of data are operated.
  • the method according to the invention according to a first embodiment is described below. It is assumed here that the first communication terminal TP1 knows its assigned network address and its network mask. This requirement is necessary for each packet-oriented communication terminal TP3, TP2 or data terminal TP1, TP2. For the description, it is assumed that communication takes place in accordance with the Internet Protocol, IP. Although this protocol is largely established as the standard in today's data networks, all other protocols can also be used as an alternative for packet-oriented transmission.
  • IP Internet Protocol
  • the method for establishing a communication connection between the calling first communication terminal TP1 and the called second communication terminal TP2 takes place as follows. Via a - not shown - network instance, e.g. a gatekeeper when using the H.323 protocol or a proxy when using the SIP protocol, the first communication terminal TP1 finds out the IP address of the second communication terminal TP2 to be called.
  • a - not shown - network instance e.g. a gatekeeper when using the H.323 protocol or a proxy when using the SIP protocol
  • the first communication terminal TP1 assesses the network topological relationship by comparing this related IP address with its own IP address and its subnet mask. After this assessment, the first communication terminal TP1 has knowledge of whether the called communication terminal TP2 is in its IP subnet (LAN) or in another subnet (WAN). Based on this knowledge, the first communication terminal TP1 then selects a suitable codec, for example an audio codec.
  • a suitable codec for example an audio codec.
  • the choice of a codec follows a preference noted by the first communication terminal TP1, something in the form of "high quality preferential" or "low bandwidth preferred". In the case of a more distant zone, a codec with higher compression is used. selects as for zones that are in the immediate vicinity or a logical part of the current zone.
  • the two communication terminals TP1, TP2 will use this codec due to the preference set for the first communication terminal TPl some, which enables bandwidth-reduced communication.
  • a called - not shown - communication terminal is located within the "own" local network zone LAN1 or the called communication terminal is an external participant with respect to the communication system CSY, who is connected via an "exchange connection" (not shown) present in the local network zone LANl a preference for a codec with optimal speech quality, for example G.711 for the communication connection to be set up, is noted in the first communication terminal TP1.
  • the called communication terminal would, however, be classified as belonging to another zone - that is to say beyond a zone boundary - and thereupon preference would be given to a higher-compression codec with less bandwidth requirement, although a higher transmission bandwidth would certainly be feasible .
  • the bandwidth available per se and thus the transmission quality are limited without technical necessity.
  • additional configurations are provided for the communication terminals TP1, TP2 on the basis of entries held there and optionally further local procedures for manual or remote-controlled setting of the configuration.
  • zones viewed as “remote” from the network topology locally stored, for example list-like, entries of zones are provided which are considered to be adjacent or local to the network topology, i.e. Zones in which a high bandwidth communication link is possible.
  • the network topological relationship continues to be subject to dynamic changes in the design of the network NW.
  • a larger bar width indicates a higher transmission bandwidth for the first three connections CN1, CN2, CN3 than for the fourth connection CN4 between the first and third local area networks LAN1, LAN3.
  • the called communication terminal TP2, which is connected to the third local area network LAN3, is therefore to be characterized as local via the first three connections CN1, CN2, CN3, provided that there are also zones in between, ie the first and the second wide area network WAN1, WAN2 appropriate transmission bandwidth is guaranteed.
  • the third local network which can now only be reached via the narrowband fourth connection CN4, is to be regarded as remote from the network topology.
  • the narrowband connection CN4 is shown in the drawing as compared to the broadband first three connections CN1, CN2, CN3 with a smaller stroke width.
  • the first communication terminal TP1 finds out the IP address of the second communication terminal TP2 to be called.
  • this IP address is compared with entries held in the first communication terminal TP1, and thus the list of nearby or local zones. As a result of this assessment, a statement is made as to whether the second communication terminal TP2 is located in a zone close to the network topology or in a zone distant from the network topology.
  • the network topology characterized the relationship of the second communication terminal TP2 as "remote”.
  • a codec with high compression is then selected in a subsequent method step, which is then noted as a preference in a subsequent capabilities exchange.
  • the network topological relationship of this called communication terminal would be found be characterized as "local" and a codec with low compression selected.
  • the method according to the second embodiment differs from that of the first embodiment in that entries are kept in the respective communication terminal TP1, TP2 which support an assessment of the network topological relationship to the respective communication partner.
  • the entries can be stored in the respective communication terminal TP1, TP2, as well as transmitted by one or more central entities (not shown) assigned to the respective communication terminal, if required.
  • the respective communication terminal behaves according to the above method according to the first embodiment, which is necessary in many applications.
  • the configuration of entries is either done manually, via an application - e.g. a so-called »IP Phone Deployment Tool « - or via a management system.
  • An effective method of handing over the entries held to the respective communication terminal TP1, TP2 is to hand over the corresponding entries during a DHCP process in accordance with documents RFC 1533 and RFC 2131 (Request for Comment) of the IETF (Internet Engineering) Task Force).
  • a method for supporting an automatic configuration of a communication device was proposed in the DE application filed on April 29, 2003 with the registration number 10319322.7, which describes a method for transmitting voice VLAN information using a DHCP method.
  • both a request and a transmission of the entries kept can be carried out by means of the present invention.
  • This also gives the full mobility of a communication terminal TP1, TP2 in the communication system CSY. Whenever a communication terminal TP1, TP2 requests an IP address via DHCP, the entries kept are transmitted.
  • IP Supernettmg When using an organizational form of the network structure also known as “IP Supernettmg” according to document RFC 1338, the number of IP subnets to be administered in the entries kept can be minimized.
  • a network management system for example HP OpenView, Tivoli or HiPath Management
  • a network management system which Knowledge of the network topology and its changes, which are reported by the active components (routers, switches), which map the network topology and which are used to generate individual entries for each communication terminal TP1, TP2.
  • These entries are then forwarded to a terminal device configuration tool (eg deployment tool, DHCP server, ...) and, as in the above description for the second exemplary embodiment, are transmitted to the communication terminals TP1, TP2.

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

Abstract

L'invention concerne un procédé pour établir une liaison de communication, un réseau (NW) orienté paquets étant composé de plusieurs zones (LAN1, WAN1, LAN2, WAN2) de réseau, reliées les unes aux autres, et un premier terminal de communication (TP1) étant relié à une première zone (LAN1) de réseau. Selon ledit procédé, une adresse de réseau d'un second terminal de communication à appeler (TP2) est reçue par le premier terminal de communication appelant (TP1) ; l'adresse de réseau du second terminal de communication (TP2) reçue est comparée à l'adresse de réseau attribuée au premier terminal de communication (TP1) et au masque de réseau associé ; une relation topologique de réseau de la deuxième zone (LAN1, WAN1, LAN2, WAN2) de réseau, reliée au second terminal de communication (TP2), est évaluée sur la base de la comparaison précédente et un codec à utiliser pour la liaison de communication est sélectionné sur la base de l'évaluation précédente.
PCT/EP2005/051503 2004-05-12 2005-04-04 Procede pour etablir une liaison de communication WO2005112415A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004023463 2004-05-12
DE102004023463.9 2004-05-12

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WO2005112415A1 true WO2005112415A1 (fr) 2005-11-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010001268A1 (en) * 1998-12-23 2001-05-17 Opuswave Networks, Inc. Wireless local loop system supporting voice/IP
US20030158969A1 (en) * 2002-01-31 2003-08-21 Gimson Roger Brian Authoring of media content and dissemination via an information technology network
WO2003077499A2 (fr) * 2002-03-11 2003-09-18 Telefonaktiebolaget L M Ericsson (Publ) Codage de donnees dans un ensemble de donnees

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010001268A1 (en) * 1998-12-23 2001-05-17 Opuswave Networks, Inc. Wireless local loop system supporting voice/IP
US20030158969A1 (en) * 2002-01-31 2003-08-21 Gimson Roger Brian Authoring of media content and dissemination via an information technology network
WO2003077499A2 (fr) * 2002-03-11 2003-09-18 Telefonaktiebolaget L M Ericsson (Publ) Codage de donnees dans un ensemble de donnees

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