EP2039175A2 - Network control unit comprising a time history and forecast option - Google Patents
Network control unit comprising a time history and forecast optionInfo
- Publication number
- EP2039175A2 EP2039175A2 EP07765603A EP07765603A EP2039175A2 EP 2039175 A2 EP2039175 A2 EP 2039175A2 EP 07765603 A EP07765603 A EP 07765603A EP 07765603 A EP07765603 A EP 07765603A EP 2039175 A2 EP2039175 A2 EP 2039175A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- time interval
- traffic
- limits
- network
- time intervals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 230000000306 recurrent effect Effects 0.000 claims 3
- 230000003044 adaptive effect Effects 0.000 claims 1
- 238000010408 sweeping Methods 0.000 claims 1
- 230000006978 adaptation Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0062—Provisions for network management
- H04Q3/0066—Bandwidth allocation or management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0876—Network utilisation, e.g. volume of load or congestion level
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/76—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
- H04L47/762—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions triggered by the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/826—Involving periods of time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5619—Network Node Interface, e.g. tandem connections, transit switching
- H04L2012/5623—Network design, dimensioning, topology or optimisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5629—Admission control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5629—Admission control
- H04L2012/5631—Resource management and allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5629—Admission control
- H04L2012/5631—Resource management and allocation
- H04L2012/5632—Bandwidth allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5651—Priority, marking, classes
Definitions
- the invention relates to a method for the automatic readjustment of limits for access controls for restricting the traffic onsnetz in a space formed with node / router and connecting these links / links communications in which data packets according to the internet protocol are forwarded white ⁇ and which supervisory to carry out the Has access controls.
- the operator also has the option of optimizing the transmission or distribution of traffic in his network by setting so-called link weights.
- link weights The setting of limits for access control and link weights represents a considerable effort in larger networks. If, in addition, parameters must be specifiable by the operator, for example to comply with economic agreements and track the settings in the event of changed traffic conditions, the operator with considerable effort is required and considerable complexity.
- the object of the invention is to optimize the tracking of boundaries for access controls in a communication network.
- periodic changes in traffic ⁇ offer to be already treated for the time of day from the network control unit NCS not just reactive to the metrological monitoring of change but with foresight.
- a configuration system is placed in the network.
- the traffic matrix and the link weights of the network are detected. These can be determined as a reaction to the triggering of the new setting and then recorded or also regularly and periodically re-determined and delivered to the configuration system.
- the invention permits the automatic calculation and configuration of operating parameters, such as e.g. Limits for access controls and link weights.
- operating parameters such as e.g. Limits for access controls and link weights.
- This automatic calculation configuration of operating parameters saves the operator the use of external optimization programs, the conversion of the parameters between different formats and the manual import of the parameters and thus lowers the
- Cost of introducing access controls for traffic restriction or traffic engineering in packet networks Cost of introducing access controls for traffic restriction or traffic engineering in packet networks.
- the configuration system according to the invention is designed for the transmission of newly determined limits for access controls to control authorities. It may also be adapted to activate the transmitted limits at the control authorities. If the newly determined link weights are to be transmitted to routers and activated there, the configuration system can also be designed for these purposes.
- NCS budgets and link metrics may already be allocated to a recurring special service
- Adapting the time of day before the change of the traffic offer on the respective day can be measured.
- the invention will be explained in more detail below in the context of an embodiment with reference to figures.
- budget is used for the transport of traffic by setting the limits for access controls.
- Figure 1 shows an inventive configuration system with input and output variables.
- Figure 2 representation of a reaction according to the inventive approach to the failure of a link.
- FIG. 1 schematically shows an inventive CONFIGURIN ⁇ assurance system.
- modules are arranged for the following functions:
- Input variables of the system are the load of the links (link load) 3 on the network side, the utilization of the available bandwidth or the bandwidth still available for the individual limits 4, the topology of the network 5 and events 6 , such as B. Power failures, which can lead to a recalculation of limits.
- On the part of the operator it is possible to specify a traffic matrix 7. However, it is also conceivable to determine a traffic matrix at regular intervals by automated measurements and to forward it to the configuration system. termont.
- the operator may impose rules or boundary conditions (operator policies) 8, which are due to economic considerations, eg. As the preferential ⁇ tion of traffic of certain customers or additional prioritization.
- the operator can configure a threshold for the number of link failures in which the budgets are to be calculated preventively so that, in the event of further failures, the QoS (quality of service) assurances or the promised quality of service to the approved reservations are known - be observed terhin. Any preventative reduction of
- the configuration system provides optimized link weights (optimized link metrics) 9 and the limits (budgets with resilience) 10 for the perennialskontrol ⁇ len NAC (NAC: network access control) which can be set so that the failure of network elements redundant bandwidth to intercept the failure is given.
- optimized link weights optimal link metrics
- limits targets with resilience
- FIG. 2 schematically shows the progression of the available network capacity 11, the available budget 12 and the budget utilization of the budget 13.
- the budgets 12 are calculated in such a way that the allocated budget ⁇ sene traffic even after the failure (failure) 14 a (belie ⁇ bigen) links in the network can still be transported with the given QoS commitments or with the promised quality of service.
- a failure occurs 14 (symbolized by the arrow in Fig. 2), then you have nothing to happen next in the network by a fast Feh ⁇ lererkennung and a corresponding fast re-routing in addition to the restoration of accessibility.
- FIG. 2 shows that, after this adaptation, at first more budget 12 can be reserved than actually exists. While this is the case, all new reservation requests are blocked on the affected budgets. Due to the natural fluctuation of the reservations this transient or temporary state is left after some time, if enough reservations have been finished. From this point on, the Resource ⁇ censcient operating normally again, and there are new Reservierun- approved if they still fit into the respective budget.
- the blocking frequency, ie, the through-average ⁇ rate of rejections of reservation requests is, with the reduced budget of course somewhat larger than before, but this is a natural consequence of the absence of the failed network resources.
- the budgets can be recalculated accordingly and the new values can be configured in the Konfigur istssys ⁇ tem or the NAC components again.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Beschreibungdescription
Netzsteuerungseinheit mit Tageszeit-Historie und Vorhersage¬ möglichkeitNetwork control unit with time of day history and prediction ¬ possibility
Die Erfindung betrifft ein Verfahren zur automatischen Neueinstellung von Grenzen für Zugangskontrollen zur Beschränkung des Verkehrs in einem mit Netzknoten/Router und diese verbindende Verbindungsstrecken/Links gebildeten Kommunikati- onsnetz, in dem Datenpakete nach dem Internet Protokoll wei¬ tergeleitet werden und welches Kontrollinstanzen zur Durchführung der Zugangskontrollen aufweist.The invention relates to a method for the automatic readjustment of limits for access controls for restricting the traffic onsnetz in a space formed with node / router and connecting these links / links communications in which data packets according to the internet protocol are forwarded white ¬ and which supervisory to carry out the Has access controls.
Eine der derzeit wichtigsten Entwicklungen auf dem Gebiet der Netze ist die Weiterentwicklung von Datennetzen für die Übertragung von Echtzeitverkehr, d. h. Sprache, Videoinformationen und Audioinformationen. Um ein Datennetz echtzeitfähig zu machen, müssen Mechanismen bereitgestellt werden, die die Einhaltung von so genannten Dienstgütemerkmalen, wie z. B. die Übertragungsdauer, den so genannten Jitter und die Paketverlustrate gewährleisten. In einem echtzeitfähigen Netz muss verhindert werden, dass Situationen auftreten, in denen zugesagte Dienstgütemerkmale nicht mehr gewährleistet werden kön¬ nen. Herkömmliche Datennetze weisen das Handicap auf, dass Überlastsituationen auftreten können, die zu langen Paketlaufzeiten oder sogar Paketverlusten führen können. Daher wird bei echtzeitfähigen Datennetzen oder Paketnetzen - herkömmliche Datennetze basieren in der Regel auf der Übertra¬ gung von IP Paketen, wie z.B. das Internet - mit Verkehrsbe- schränkung zumindest für Echtzeitverkehr gearbeitet, um dem Echtzeitverkehr die erforderliche Dienstgüte zur Verfügung stellen zu können. Verkehrsbeschränkung basiert meist auf Zugangskontrollen am Netzrand, im Zuge derer zu übertragender Verkehr angemeldet und je nach verfügbarer Bandbreite zuge¬ lassen oder abgewiesen wird.One of the most important developments currently in the field of networks is the further development of data networks for the transmission of real-time traffic, ie voice, video information and audio information. In order to make a data network real-time capable, mechanisms must be provided which ensure compliance with so-called quality of service characteristics such. B. ensure the transmission time, the so-called jitter and the packet loss rate. Where are promised quality of service features no longer guaranteed Kings ¬ nen in a real-time network must be prevented that situations occur. Conventional data networks have the handicap that overload situations can occur, which can lead to long packet delays or even packet losses. Therefore, in real-time data networks or packet networks - traditional data networks are generally based on the Übertra ¬ supply of IP packets, such as the Internet - with Verkehrsbetriebe restriction at least worked for real-time traffic in order to provide the required quality of service available to the real-time traffic. Traffic restriction is usually based on access controls at the edge of the network, in the course of which to be transferred -Approved logged traffic and depending on the available bandwidth ¬ or rejected.
Bei der Einrichtung von Zugangskontrollen soll einerseits eine dienstgerechte Dienstgüte garantiert werden, anderer¬ seits hat der Netzbetreiber das Interesse, möglichst viel Verkehr zu übertragen, um so möglichst hohe Einkünfte zu erzielen. Bei der Wahl der Grenzen muss daher ein Kompromiss gefunden werden, der eine Übertragung von möglichst viel Ver- kehr erlaubt, ohne dass dadurch die Dienstgüte beeinträchtigt würde .When setting up an access control service-oriented quality of service to be guaranteed on the one hand, on the other hand, ¬ the network operator's interest to transfer as much traffic, so as to achieve the highest possible income. In the choice of borders, therefore, a compromise has to be found which allows transmission of as much traffic as possible without impairing the quality of service.
In Datennetzen hat der Betreiber zusätzlich die Möglichkeit, durch Festsetzen von so genannten Linkgewichten die Übertra- gung bzw. Verteilung von Verkehr in seinem Netz zu optimieren. Die Festsetzung von Grenzen für die Zugangskontrolle und Linkgewichten stellt in größeren Netzen einen beträchtlichen Aufwand dar. Wenn zusätzlich noch betreiberseitig Parameter vorgebbar sein sollen, um beispielsweise wirtschaftlichen Vereinbarungen nachzukommen und die Einstellungen bei veränderten Verkehrsbedingungen nachführbar sein sollen, ist der Betreiber mit Konfigurieren von beträchtlichem Aufwand und beträchtlicher Komplexität konfrontiert.In data networks, the operator also has the option of optimizing the transmission or distribution of traffic in his network by setting so-called link weights. The setting of limits for access control and link weights represents a considerable effort in larger networks. If, in addition, parameters must be specifiable by the operator, for example to comply with economic agreements and track the settings in the event of changed traffic conditions, the operator with considerable effort is required and considerable complexity.
Die Erfindung hat zur Aufgabe, die Nachführung von Grenzen für Zugangskontrollen in einem Kommunikationsnetz zu optimieren. Insbesondere sollen periodische Änderungen im Verkehrs¬ angebot über der Tageszeit von der Netzsteuerungseinheit NCS nicht erst reaktiv nach der messtechnischen Beobachtung der Änderung, sondern bereits vorausschauend behandelt werden.The object of the invention is to optimize the tracking of boundaries for access controls in a communication network. In particular, periodic changes in traffic ¬ offer to be already treated for the time of day from the network control unit NCS not just reactive to the metrological monitoring of change but with foresight.
Die Aufgabe wird durch den Gegenstand des Anspruchs 1 gelöst . Zur automatischen Konfigurierung von Grenzen wird ein Konfigurierungssystem im Netz angeordnet. In dem Konfigurierungs¬ system des Kommunikationsnetzes werden die Verkehrsmatrix und die Linkgewichte des Netzes erfasst. Diese können als Reak- tion auf das Auslösen der Neueinstellung ermittelt und dann erfasst werden oder auch regelmäßig bzw. periodisch neu ermittelt und an das Konfigurierungssystem geliefert werden.The object is solved by the subject matter of claim 1. For automatic configuration of limits, a configuration system is placed in the network. In the Konfigurierungs ¬ system of the communications network, the traffic matrix and the link weights of the network are detected. These can be determined as a reaction to the triggering of the new setting and then recorded or also regularly and periodically re-determined and delivered to the configuration system.
Die Erfindung erlaubt die automatische Berechnung und Konfi- guration von Betriebsparametern, wie z.B. Grenzen für Zugangskontrollen und Linkgewichte. Diese automatische Berechnungskonfiguration von Betriebsparametern erspart dem Betreiber die Benutzung externer Optimierungsprogramme, die Konversion der Parameter zwischen verschiedenen Formaten und das manuelle Einspielen der Parameter und senkt damit dieThe invention permits the automatic calculation and configuration of operating parameters, such as e.g. Limits for access controls and link weights. This automatic calculation configuration of operating parameters saves the operator the use of external optimization programs, the conversion of the parameters between different formats and the manual import of the parameters and thus lowers the
Kosten für die Einführung von Zugangskontrollen für Verkehrsbeschränkung oder Traffic Engineering in Paketnetzen.Cost of introducing access controls for traffic restriction or traffic engineering in packet networks.
Das erfindungsgemäße Konfigurierungssystem ist für die Über- mittelung von neu ermittelten Grenzen für Zugangskontrollen an Kontrollinstanzen ausgestaltet. Es kann zudem zur Aktivierung der übermittelten Grenzen bei den Kontrollinstanzen angepasst sein. Falls die neu ermittelten Linkgewichte an Router zu übermitteln sind und dort aktiviert werden sollen, kann das Konfigurierungssystem auch für diese Zwecke ausgebildet sein.The configuration system according to the invention is designed for the transmission of newly determined limits for access controls to control authorities. It may also be adapted to activate the transmitted limits at the control authorities. If the newly determined link weights are to be transmitted to routers and activated there, the configuration system can also be designed for these purposes.
Durch die Tageszeitabhängige Erfassung von Verkehrsmatrizen kann der NCS Budgets und ggf. Linkmetriken bereits auf ein wiederkehrendes besonderes Verkehrsangebot zu bestimmtenBy recording traffic matrices on a time-of-day basis, NCS budgets and link metrics may already be allocated to a recurring special service
Tageszeiten anpassen, bevor die Änderung des Verkehrsangebotes am jeweiligen Tage messtechnisch erfassbar wird. Die Erfindung wird im Folgenden im Rahmen eines Ausführungsbeispiels an Hand von Figuren näher erläutert. Dabei wird der Begriff Budget für die durch die Festsetzung von Grenzen für die Zugangskontrollen vorhandene Bandbreite für den Transport von Verkehr verwendet .Adapting the time of day before the change of the traffic offer on the respective day can be measured. The invention will be explained in more detail below in the context of an embodiment with reference to figures. The term budget is used for the transport of traffic by setting the limits for access controls.
Es zeigenShow it
Figur 1 ein erfindungsgemäßes Konfigurierungssystem mit Eingangs- und Ausgangsgrößen.Figure 1 shows an inventive configuration system with input and output variables.
Figur 2 Darstellung einer Reaktion entsprechend dem erfindungsgemäßen Vorgehen auf den Ausfall eines Links.Figure 2 representation of a reaction according to the inventive approach to the failure of a link.
Figur 1 zeigt schematisch ein erfindungsgemäßes Konfigurie¬ rungssystem. In diesem System sind Module für folgende Funktionen angeordnet:Figure 1 schematically shows an inventive CONFIGURIN ¬ assurance system. In this system, modules are arranged for the following functions:
1: Optimierung der Metrik und Berechnung neuer Linkgewichte (Link Metrie Optimisation) .1: Optimization of the metric and calculation of new link weights (Link Metrie Optimization).
2: Berechnung neuer Grenzen für die Zugangskontrollen (NAC Budget Computation) .2: Calculation of New Limits for Access Controls (NAC Budget Computation).
Eingabegrößen des Systems sind netzseitig die Last der Links (link load) 3, die Auslastung der verfügbaren Bandbreite bzw. die bei den einzelnen Grenzen noch verfügbare Bandbreite (budget usage) 4, die Topologie des Netzes (topology) 5 und Ereignisse (events) 6, wie z. B. Netzausfälle, welche zu einer Neuberechnung von Grenzen führen können. Auf Seite des Betreibers ist es möglich, eine Verkehrsmatrix (traffic matrix) 7 vorzugeben. Es ist aber auch denkbar, eine Verkehrsmatrix durch automatisierte Messungen in regelmäßigen Abständen zu ermitteln und an das Konfigurierungssystem wei- terzugeben. Daneben können vom Betreiber Regeln oder Randbedingungen (Operator policies) 8 vorgegeben werden, die durch wirtschaftliche Überlegungen bedingt sind, z. B. die Bevorzu¬ gung von Verkehr bestimmter Kunden oder zusätzliche Priori- sierungen. So kann der Betreiber z.B. eine Schwelle für die Anzahl der Linkausfälle konfigurieren, bei denen noch präventiv die Budgets so berechnet werden sollen, dass bei weiteren Ausfällen die QoS-Zusagen (QoS: quality of Service) bzw. die zugesagte Dienstgüte an die zugelassenen Reservierungen wei- terhin eingehalten werden. Jede präventive Reduktion derInput variables of the system are the load of the links (link load) 3 on the network side, the utilization of the available bandwidth or the bandwidth still available for the individual limits 4, the topology of the network 5 and events 6 , such as B. Power failures, which can lead to a recalculation of limits. On the part of the operator, it is possible to specify a traffic matrix 7. However, it is also conceivable to determine a traffic matrix at regular intervals by automated measurements and to forward it to the configuration system. terzugeben. In addition, the operator may impose rules or boundary conditions (operator policies) 8, which are due to economic considerations, eg. As the preferential ¬ tion of traffic of certain customers or additional prioritization. For example, the operator can configure a threshold for the number of link failures in which the budgets are to be calculated preventively so that, in the event of further failures, the QoS (quality of service) assurances or the promised quality of service to the approved reservations are known - be observed terhin. Any preventative reduction of
Budgets erhöht naturgemäß die Blockierungshäufigkeit und ver¬ ringert damit die Einnahmen des Netzbetreibers, während sie andererseits eine Sicherheit gegen Verletzung der QoS-Zusagen bietet .Budget naturally increases the blocking frequency and so ver ¬ Ringert revenue of the network operator, while on the other hand, offers security against violation of the QoS commitments.
Als Ausgangsgrößen liefert das Konfigurierungssystem optimierte Linkgewichte (optimized link metrics) 9 und die Grenzen (budgets with resilience) 10 für die Zugangskontrol¬ len NAC (NAC: network access control), welche so festgesetzt werden können, dass für den Ausfall von Netzelementen redundante Bandbreite zum Abfangen des Ausfalls gegeben ist.As output values the configuration system provides optimized link weights (optimized link metrics) 9 and the limits (budgets with resilience) 10 for the Zugangskontrol ¬ len NAC (NAC: network access control) which can be set so that the failure of network elements redundant bandwidth to intercept the failure is given.
Für die Aktivierung von Grenzen bzw. Budgets kann ein weiteres Protokoll eingesetzt werden, um eine konsistente Budget- anpassung zu erreichen. Zunächst werden von den Budgetänderungen nur die Budgetverringerungen aktiviert. Die Zugangskontrollinstanzen (NACs) geben dem Konfigurierungssystem (z.B. Network Control Server NCS) bescheid, sobald jeweils das reservierte Budget sich im Rahmen des neu vorgegebenen Budgets bewegt. Wenn alle NACs für alle geänderten Budgets dem NCS signalisiert haben, dass die Budgets jetzt eingehal¬ ten werden, kann der NCS die restlichen (zu erhöhenden) Budgets erhöhen. Während des Netzbetriebes werden Link- und Budgetauslastungen sowie Topologieänderungen (Ausfälle, Wiederinbetriebnahmen, Netzerweiterungen) und sonstige Ereignisse beobachtet und ggf. neue Budgets bzw. Link-Kostenmetriken berechnet. Im Folgenden wird auf die Reaktion auf Ausfälle näher eingegangen. Die Verarbeitung der Auslastungs-Messdaten ist Gegenstand einer separaten Erfindungsmeldung.For the activation of borders or budgets, another protocol can be used to achieve a consistent budget adjustment. Initially, the budget changes only activate the budget reductions. The access control authorities (NACs) inform the configuration system (eg Network Control Server NCS) as soon as the reserved budget moves within the scope of the newly defined budget. If all NACs have signaled for all budgets amended the NCS that the budgets are now eingehal ¬ th, the NCS, the remaining (to be increased) Increase budget. During network operation, link and budget utilization as well as topology changes (failures, re-commissioning, network extensions) and other events are monitored and, if necessary, new budgets or link cost metrics are calculated. In the following, the response to failures is described in more detail. The processing of the utilization measurement data is the subject of a separate invention disclosure.
Fig. 2 zeigt schematisch den Verlauf der verfügbaren Netzka- pazität (capacity) 11, des verfügbaren Budgets (budget) 12 und der Auslastung des Budgets über der Zeit (budget utiliza- tion) 13. Die Budgets 12 sind so berechnet, dass der zugelas¬ sene Verkehr auch nach dem Ausfall (failure) 14 eines (belie¬ bigen) Links im Netz noch mit den gegebenen QoS-Zusagen bzw. mit der zugesagten Dienstgüte transportiert werden kann. Wenn nun tatsächlich ein solcher Ausfall 14 eintritt (symbolisiert durch den Pfeil in Fig. 2), dann muss außer der Wiederherstellung der Erreichbarkeit im Netz durch eine schnelle Feh¬ lererkennung und ein entsprechendes schnelles Re-Routing nichts weiter geschehen.FIG. 2 schematically shows the progression of the available network capacity 11, the available budget 12 and the budget utilization of the budget 13. The budgets 12 are calculated in such a way that the allocated budget ¬ sene traffic even after the failure (failure) 14 a (belie ¬ bigen) links in the network can still be transported with the given QoS commitments or with the promised quality of service. Now, if in fact such a failure occurs 14 (symbolized by the arrow in Fig. 2), then you have nothing to happen next in the network by a fast Feh ¬ lererkennung and a corresponding fast re-routing in addition to the restoration of accessibility.
Um allerdings auch bei weiteren Linkausfällen wieder den Erhalt der Dienstgüte (QoS) sicherstellen zu können, wird das Konfigurierungssystem (NCS: network control Server) 15 dennoch die Budgets auf die jetzt gültige neue Topologie anpassen (NCS reaction) . Fig. 2 zeigt, dass nach dieser Anpassung zunächst mehr Budget 12 reserviert sein kann als tatsächlich vorhanden ist. Während dies der Fall ist, werden auf den betroffenen Budgets alle neuen Reservierungs-Anfragen blockiert . Durch die natürliche Fluktuation der Reservierungen wird dieser transiente bzw. vorübergehende Zustand nach einiger Zeit wieder verlassen, wenn genügend Reservierungen beendet wurden. Von diesem Zeitpunkt an arbeitet die Ressour¬ cenverwaltung wieder normal, und es werden neue Reservierun- gen zugelassen, falls sie noch in das jeweils betroffene Budget passen. Die Blockierungshäufigkeit, d.h. die durch¬ schnittliche Rate für Abweisungen von Reservierungsanfragen, ist mit den reduzierten Budgets natürlich etwas größer als vorher, aber das ist die natürliche Konsequenz des Fehlens der ausgefallenen Netzressourcen.However, in order to be able to ensure the receipt of the quality of service (QoS) again in the case of further link failures, the configuration system (NCS: network control server) 15 will nevertheless adapt the budgets to the now valid new topology (NCS reaction). FIG. 2 shows that, after this adaptation, at first more budget 12 can be reserved than actually exists. While this is the case, all new reservation requests are blocked on the affected budgets. Due to the natural fluctuation of the reservations this transient or temporary state is left after some time, if enough reservations have been finished. From this point on, the Resource ¬ cenverwaltung operating normally again, and there are new Reservierun- approved if they still fit into the respective budget. The blocking frequency, ie, the through-average ¬ rate of rejections of reservation requests is, with the reduced budget of course somewhat larger than before, but this is a natural consequence of the absence of the failed network resources.
Wenn ein einmal ausgefallener Link wieder in Betrieb geht, können die Budgets entsprechend wieder neu berechnet werden und die neuen Werte können wieder in dem Konfigurierungssys¬ tem bzw. den NAC-Komponenten konfiguriert werden. When a once failed link starts operating again, the budgets can be recalculated accordingly and the new values can be configured in the Konfigurierungssys ¬ tem or the NAC components again.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006029929A DE102006029929A1 (en) | 2006-06-29 | 2006-06-29 | Network control unit with time of day history and predictability |
| PCT/EP2007/056326 WO2008000722A2 (en) | 2006-06-29 | 2007-06-25 | Network control unit comprising a time history and forecast option |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2039175A2 true EP2039175A2 (en) | 2009-03-25 |
Family
ID=38776894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07765603A Withdrawn EP2039175A2 (en) | 2006-06-29 | 2007-06-25 | Network control unit comprising a time history and forecast option |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2039175A2 (en) |
| DE (1) | DE102006029929A1 (en) |
| WO (1) | WO2008000722A2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004045980B3 (en) * | 2004-09-22 | 2006-05-18 | Siemens Ag | Automatic tracking of network parameters with changes in traffic load |
| DE102004057496B4 (en) * | 2004-11-29 | 2006-08-24 | Siemens Ag | Method and apparatus for automatic resetting of access control limits to restrict traffic in a communication network |
-
2006
- 2006-06-29 DE DE102006029929A patent/DE102006029929A1/en not_active Withdrawn
-
2007
- 2007-06-25 EP EP07765603A patent/EP2039175A2/en not_active Withdrawn
- 2007-06-25 WO PCT/EP2007/056326 patent/WO2008000722A2/en not_active Ceased
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| Title |
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| See references of WO2008000722A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008000722A2 (en) | 2008-01-03 |
| DE102006029929A1 (en) | 2008-01-03 |
| WO2008000722A3 (en) | 2008-05-15 |
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