WO2004006506A1 - Procede de selection de ressources dans des reseaux de communication par fixation d'un ordre de priorite des ressources en fonction des prestations et des fonctions - Google Patents

Procede de selection de ressources dans des reseaux de communication par fixation d'un ordre de priorite des ressources en fonction des prestations et des fonctions Download PDF

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Publication number
WO2004006506A1
WO2004006506A1 PCT/DE2003/001891 DE0301891W WO2004006506A1 WO 2004006506 A1 WO2004006506 A1 WO 2004006506A1 DE 0301891 W DE0301891 W DE 0301891W WO 2004006506 A1 WO2004006506 A1 WO 2004006506A1
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WO
WIPO (PCT)
Prior art keywords
resources
communication
components
network
resource
Prior art date
Application number
PCT/DE2003/001891
Other languages
German (de)
English (en)
Inventor
Ralf Neuhaus
Rainer Uecker
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
Priority to AU2003239766A priority Critical patent/AU2003239766A1/en
Priority to DE10393424T priority patent/DE10393424D2/de
Publication of WO2004006506A1 publication Critical patent/WO2004006506A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42365—Presence services providing information on the willingness to communicate or the ability to communicate in terms of media capability or network connectivity

Definitions

  • Communication networks the components of which communicate with one another in a packet-switched manner, are increasingly taking the place of circuit-switching communication networks.
  • Such networks are often also referred to as Voice-over-IP (VoIP for short) networks if the internet protocol (IP) is used to exchange the acoustic information in the form of data.
  • IP internet protocol
  • the networks can either be used exclusively for the transmission of voice data, or they can transmit both voice data and other information in mixed form.
  • the devices arranged in and connected to one another in communication networks are generally referred to as communication components. If such a communication component is used as a terminal, for example as a telephone or multimedia terminal, this component is also referred to as a client component. Other components do not serve as end devices, but provide services in the communication network.
  • the services can be, for example, a gateway functionality, a voice mail server, an address directory or the like.
  • Such communication components are also referred to as server components.
  • the services and functions provided by the server components are often referred to as resources in the literature.
  • Both the client components and the server components generally consist of computer hardware (for example a PC) which, with the aid of appropriate hardware expansions and adapted software, carry out corresponding functionalities.
  • more than one software application can also be installed on a computer hardware, so that a single physical component in the network work can basically perform both client and server functionalities.
  • Such communication components are also referred to in the literature as servents, an artificial word which is derived from the terms "client” and "server”.
  • the communication components connect to each other by exchanging addressed data packets.
  • Each communication component in the packet-switching network has a network address that is uniquely assigned to it. In networks that exchange data according to the Internet protocol (IP networks), this is, for example, the IP address and the IP port number. If a communication component is to connect to another communication component or exchange data, the network address of the other component must be found out beforehand.
  • IP networks Internet protocol
  • the network addresses are not always permanently assigned to the communication components, but can also be assigned dynamically in the network, as a result of which communication components can have a different address after each switching off and on again or after predetermined events. For this reason, in the known packet-switching communication networks, at least one network component is equipped with an address directory (address database) of all communication components available in this network. These server components are usually referred to as gatekeepers.
  • each communication component for example a PC
  • the searching component needs the network address of the component that holds the searched file ready for retrieval. To do this, it first sends a first search message, the so-called "ping".
  • Communication components that receive a "ping" search message respond to the searching communication component with a hit response, the so-called "pong".
  • This hit response contains the network address of the responding communication component and the number of files made available by this component for exchange.
  • the searching component sends a second search message "Query" to a limited selection of those communication components that answered the "ping" search message with a "pong".
  • the second search message already contains the file name of the file you are looking for. If a component receives a second "Query" search message, but does not have the file it is looking for available for exchange, it forwards this search message to other communication components in the network, the addresses of which it pinged, for example, using a "ping" that was carried out in the past "Procedure. However, if the communication component can make the desired file available for exchange, it answers the second search message "Query” with a hit response "Query Hit", which means that the searching communication component transfers the file using commands defined in the Internet protocol can initiate.
  • the Gnutella process is used when a specific file is searched for in other communication components. The search process ends as soon as the file you are looking for is found for the first time.
  • the client components of a packet-switching communication network require the usage-relevant information about several server components of this type, because the gateways only ever support a limited number of communication connections at the same time according to their number of channels. If a gateway is already fully utilized, it must be possible to switch to another gateway.
  • gateways are available in a packet-switching communication network, it is common for client components to have stored a list with several gateways.
  • a client component contacts all the gateways that are on the list in turn until a gateway with sufficient (remaining) capacity is found.
  • the first gateway on this list is also called the "default gateway” and the other gateways on this list are called “fall-back gateways”.
  • the list of available resources in the network is administered from a central point in the network. If the network topology changes or if the available server components are changed, the list is changed and then updated the client components again.
  • Gateways and other resources in the network are held several times, primarily for reasons of capacity. These components are usually spatially distributed in the network. On the one hand, this shortens the connection path on the one hand, and on the other hand, particularly in the case of the gateways, leads to cost advantages. The required high level of reliability is also a reason for having multiple central components in networks.
  • circuit-switching networks for example in ISDN communication systems, the switching technology is available in duplicate, the second controller provided as a replacement system permanently performing all switching-related processes “in the background” in exactly the same way as the active system. In the event of a fault, the system automatically switches to the replacement system.
  • the object of the invention is to make the selection of resources in packet-switching networks more effective and at the same time to reduce the effort for administration of the networks.
  • the solution to this problem provides that a communication component searches for several or all resources in the packet-switching communication network in a first method step, and functions and information about the performance of several or all found resources are determined and stored in a second method step. The order in which the resources with the function to be used are checked for their availability is determined on the basis of the information stored in the second method step. This means that the most suitable, currently available resource is always used.
  • resources are the usable services of communication components, these resources can be used by the client components of the own and other communication components.
  • the effort required for administration of the communication network is reduced in that at least one of the communication components has an integrated search function for determining the addresses of resources of further communication components.
  • the resource that has the fastest network connection to the searching communication component can be used.
  • the selection of resources can be carried out more quickly if the resources have stored information about their functions and / or their performance and transmit this information as a response to search queries to the searching communication components and if this information for determining the order of the searching communication Components are evaluated.
  • the unsuccessful contacting of unsuitable resources can be avoided if the information on the performance ability to include information about the current workload or the remaining capacity of the resource.
  • the single figure shows a schematic representation of a packet-switching communication network which is connected to a circuit-switching public communication network.
  • Communication components AI - A4, Bl - Bll are connected to one another in a packet-switching communication network VoIP.
  • the communication components AI - A4, B3 - B1 are servents, which means that they have both client and server functionalities.
  • the communication components B1, B2 are "simple" IP telephones, that is to say communication components with pure client functionality.
  • Gateways are implemented in the communication components AI, A4 as server functionality, which connect the packet-switching communication network VoIP to the circuit-switching communication network ISDN.
  • the gateways installed on the communication components AI and A4 are located at different locations and also in different local network areas of the circuit-switched communication network ISDN.
  • the gateways enable connections between the communication components AI - A4, B1 - B1 of the packet-switching communication network VoIP and the circuit-switching communication systems S1, S2, to which ISDN terminals Cl - C3 are connected.
  • the gateways are available as usable resources for all client components in the packet-switching VoIP communication network and also for the communication systems Sl, S2 are available in the line-switching communication network ISDN.
  • the 5 gateways installed on the communication components AI, A4 can be used by the client components of the communication components Bl, B2 and all in the packet-switching VoIP communication network on the communication components AI - A4, B3 - Bll - mainly in the form of software Applications - installed client components can be selected and used L0.
  • A4, B3 - B1 a communication software installed, which provides the client functionality.
  • the communication software is designed so that it also .5 examines its own communication component AI - A4, B3 - B1 to determine which server functionalities can be made available. The latter occurs at least when the communication software is started for the first time. This information about the server functionalities is then stored in such a way that it can be called up by the other communication components AI - A4, B3 - B1 using appropriate search methods.
  • the search for resources in the packet-switching communication network VoIP the selection of one of several gateways as resources and the use of the selected gateway for the purpose of a communication connection between the communication component A3 and the ISDN terminal C1 described in the line-switching communication network ISDN.
  • the client component of the communication component A3 looks for other, "neighboring" communication components in the packet-switching communication network VoIP. For this purpose, procedures defined in the Internet protocol are used, which all components of a Network segment prompts for a response message. This is done by means of a so-called “broadcast", ie a message addressed to all accessible components.
  • the communication component A3 determines and stores the network addresses of the communication components AI and A2.
  • the communication component A3 sends search messages to the “neighboring” communication components AI and A2 which contain the demand for resources of a certain type, namely for gateways.
  • the communication component A3 is preset in such a way that, with the aid of this search method, it searches only for resources of the type that are likely to be used or, based on experience, more frequently. These include gateways that enable connections between the packet-switching VoIP communication network and the ISDN circuit-switching communication network. Other resources that are used less frequently, for example servers for carrying out telephone conferences, are only searched for in the packet-switching VoIP communication network when the client component installed on component A3 requests the use of such a resource.
  • the communication software of the communication component A3 searches exclusively for gateways in the packet-switching communication network VoIP, because this is the most frequently used type of resource.
  • the communication component A2 does not have its own gateway, so that it forwards the search query of the communication component A3 to other communication components A4, B5, B6.
  • the communication component AI has its own gateway and answers the search query of the communication component A3 with a positive answer, which the Network address of the communication component AI and the access parameters to the gateway installed there. This information is stored in a table by the communication component A3.
  • the communication component AI also sends the search message to other communication components B3, BIO, B1 known to it.
  • the communication component A4 also has its own gateway, so that it answers the search query of the communication component A3, which it received via the "detour" of the communication component A2, in the same way, the answer analogously to the case of Communication component AI includes the network address of the communication component A4 and the access parameters of the gateway installed there. This information is also stored by the communication component A3 in the table of the available gateways.
  • the search messages which are forwarded from the communication component A3 to their neighboring communication components AI and A2 and from these in turn to further communication components, contain a number in a predefined data field, which acts as a counter each time the search message is forwarded by one communication component to the next communication component is reduced by 1. As soon as this number has reached the value 0 by continuing to forward the search message, the search message is no longer transmitted in the packet-switching VoIP communication network. This prevents the search message from being forwarded an infinite number of times.
  • the start value of this counter is set sufficiently high in the communication component A3 so that a large part of the packet-switching communication network VoIP or the complete packet-switching communication network is searched. For example, the number here has the value 10.
  • the communication component A3 receives no further answers.
  • Client component wants to establish a communication connection to a terminal C1 to C3 in the circuit-switched communication network ISDN.
  • the communication component A3 sends a series of test messages to each of the two gateways found.
  • a test message is, for example, the "PING", which is very common on the Internet to check the connection to other communication components.
  • These test messages are answered by the communication components AI and A4 with a corresponding standardized answer.
  • the time period between the transmission of the test message from the communication component A3 and the receipt of the corresponding response is referred to as the runtime of the test message.
  • the runtimes of the test messages are measured and stored by the communication component A3.
  • a mean value is formed from the runtimes of all test messages for a gateway and added to the entries in the resource table. Based on the average runtimes, the table is now sorted in such a way that the gateway with the lowest average runtime comes first.
  • the communication component A3 sends a query message to each of the gateways found, with the aid of which the performance characteristics of the gateways are queried. This includes the number of voice channels to the circuit-switched ISDN communication network and the band Width of the connection of the gateways to the packet-switching VoIP communication network. The information about the performance features obtained through these queries are also stored in the table of the communication component A3.
  • the other available information - such as the number of channels or the bandwidth of the IP connection - can now be used as a sort criterion for the resources of a certain type.
  • the list is sorted on the basis of the average runtime of the test messages, so that when a connection is set up, this list is processed starting with the resource with the shortest average runtime and the resource is selected which is the first to set up the
  • the communication component A3 carries out a connection test to all the resources listed at regular intervals.
  • the search for resources in the packet-switching VoIP communication network is also repeated regularly, so that communication components and their resources which have recently been added to the VoIP packet-switching communication network are found and can thus be used.

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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 de sélection de ressources dans des réseaux de communication, selon lequel des composants de communication utilisent les ressources dans le réseau. Une ressource faisant partie de plusieurs ressources présentant la même fonction est sélectionnée par un des composants de communication, des étapes dudit procédé étant exécutées pour l'utilisation de cette fonction. Tout d'abord, le composant de communication demande si une première des ressources est disponible, et si cette première ressource n'est pas disponible, il demande si d'autres ressources sont disponibles et, enfin ,il demande l'utilisation d'une ressource disponible. Dans une première étape du procédé, le composant de communication recherche plusieurs ressources ou toutes les ressources dans le réseau et, dans une seconde étape du procédé, les fonctions et les indications relatives à la capacité de prestation de plusieurs ressources ou de toutes les ressources trouvées sont déterminées et mémorisées. Sur la base des indications mémorisées dans la seconde étape du procédé est fixé l'ordre dans lequel les ressources présentant la fonction à utiliser sont contrôlées en ce qui concerne leur disponibilité.
PCT/DE2003/001891 2002-07-08 2003-06-06 Procede de selection de ressources dans des reseaux de communication par fixation d'un ordre de priorite des ressources en fonction des prestations et des fonctions WO2004006506A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003239766A AU2003239766A1 (en) 2002-07-08 2003-06-06 Method for selecting resources in communication networks by prioritising said resources according to performance and function
DE10393424T DE10393424D2 (de) 2002-07-08 2003-06-06 Verfahren und Ressourcen-Auswahl in Kommunikation-Netzwerken mittels leistungs- und funktionsbezogener Priorisierung der Ressourcen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10230683.4 2002-07-08
DE10230683A DE10230683B3 (de) 2002-07-08 2002-07-08 Verfahren zur Ressourcen-Auswahl in Kommunikations-Netzwerken

Publications (1)

Publication Number Publication Date
WO2004006506A1 true WO2004006506A1 (fr) 2004-01-15

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PCT/DE2003/001891 WO2004006506A1 (fr) 2002-07-08 2003-06-06 Procede de selection de ressources dans des reseaux de communication par fixation d'un ordre de priorite des ressources en fonction des prestations et des fonctions

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AU (1) AU2003239766A1 (fr)
DE (2) DE10230683B3 (fr)
WO (1) WO2004006506A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000077637A1 (fr) * 1999-06-10 2000-12-21 Gateway, Inc. Selection dynamique d'un serveur sur la base de la performance
WO2001027772A1 (fr) * 1999-10-12 2001-04-19 Mindarrow Systems Equilibrage de charge par selection de source de messages
US20010034752A1 (en) * 2000-01-26 2001-10-25 Prompt2U Inc. Method and system for symmetrically distributed adaptive matching of partners of mutual interest in a computer network
US20020073204A1 (en) * 2000-12-07 2002-06-13 Rabindranath Dutta Method and system for exchange of node characteristics for DATA sharing in peer-to-peer DATA networks

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511208A (en) * 1993-03-23 1996-04-23 International Business Machines Corporation Locating resources in computer networks having cache server nodes
US6332023B1 (en) * 1998-06-04 2001-12-18 Mci Communications Corporation Method of and system for providing services in a communications network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000077637A1 (fr) * 1999-06-10 2000-12-21 Gateway, Inc. Selection dynamique d'un serveur sur la base de la performance
WO2001027772A1 (fr) * 1999-10-12 2001-04-19 Mindarrow Systems Equilibrage de charge par selection de source de messages
US20010034752A1 (en) * 2000-01-26 2001-10-25 Prompt2U Inc. Method and system for symmetrically distributed adaptive matching of partners of mutual interest in a computer network
US20020073204A1 (en) * 2000-12-07 2002-06-13 Rabindranath Dutta Method and system for exchange of node characteristics for DATA sharing in peer-to-peer DATA networks

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Publication number Publication date
AU2003239766A1 (en) 2004-01-23
DE10393424D2 (de) 2005-06-09
DE10230683B3 (de) 2004-02-26

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