EP0941619A1 - Procede et systeme d'organisation dynamique du trafic dans un reseau de communication - Google Patents

Procede et systeme d'organisation dynamique du trafic dans un reseau de communication

Info

Publication number
EP0941619A1
EP0941619A1 EP97947027A EP97947027A EP0941619A1 EP 0941619 A1 EP0941619 A1 EP 0941619A1 EP 97947027 A EP97947027 A EP 97947027A EP 97947027 A EP97947027 A EP 97947027A EP 0941619 A1 EP0941619 A1 EP 0941619A1
Authority
EP
European Patent Office
Prior art keywords
route
alternative
fan
routes
alternative routes
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Withdrawn
Application number
EP97947027A
Other languages
German (de)
English (en)
Inventor
Rainer Stademann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP0941619A1 publication Critical patent/EP0941619A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/64—Distributing or queueing
    • H04Q3/66—Traffic distributors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13109—Initializing, personal profile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13141—Hunting for free outlet, circuit or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13164—Traffic (registration, measurement,...)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13166—Fault prevention
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13213—Counting, timing circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13217—Cranckback in routing, trombone connection, loopback circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13332—Broadband, CATV, dynamic bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13344—Overflow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13353—Routing table, map memory

Definitions

  • the invention relates to a method and a routing system for dynamic traffic control in a communication network
  • Non-hierarchically organized, circuit-switched communication networks require dynamic routing, which adapts to the traffic load in the network in such a way that network throughput is optimized. In particular, unbalanced load situations must be mitigated by routing.
  • any overflow traffic that occurs is assigned to one or more active alternative routes.
  • This active alternative route or these active alternative routes are not fixed, but are selected in accordance with the respective method for dynamic routing or are even redetermined for each call.
  • the advantages of dynamic routing lie in its robustness and flexibility compared to unbalanced load situations in the network, which e.g. due to fluctuating loads (spatially limited high volume of traffic, e.g. in the event of disasters) and network degradation (failure of trunk bundles, failures of switching units).
  • uncertainties in network planning can be better compensated for.
  • Central state-controlled (dynamic) routing methods are based on a network-central processor, which provides information about the existing local network nodes
  • Decentralized, state-controlled (dynamic) methods are based on the feedback of load states of the trunk groups to the origin node of the non-hierarchical (sub) network.
  • Methods have the disadvantage that the non-standardized interface between the network nodes requires a homogeneous network (e.g. network nodes from only one manufacturer) and that a high signaling effort is also required.
  • Decentralized event-controlled (dynamic) routing methods can increase performance achieve by learning the respective load situation by evaluating the busy events. These methods use the blocking event information to replace the blocked path with another path.
  • sporadic blockages caused by statistical fluctuations in the offered traffic
  • almost complete blockages caused by unbalanced loads or partial network overload.
  • a decentralized event-controlled method according to the preamble of claim 1 is known from European application EP 0 696 147 AI (internal to SAG 94P1542E).
  • the invention has for its object to avoid the disadvantage mentioned.
  • the invention prevents that highly loaded alternative routes too soon after leaving the
  • the figure shows a diagram of a small, fully meshed network with six network switching nodes and the corresponding capacities of the path sections (links) between the network nodes, a link comprising at least one trunk group.
  • switching node 1 has a call for switching node 2, but the direct route between the two switching nodes is not available.
  • the path fan i.e. the subjects of the active alternative routes, after its last reinitialization, comprise three alternative routes, namely the two-link alternative routes via the switching nodes 3, 4 and
  • routing system would cyclically distribute the overflowing traffic over these active alternative routes in the order of transit nodes 3, 4 and 5.
  • the routing system at switching node 1 first checks whether the first link of the active alternative route is available via transit node 3, i.e. whether the link between switching nodes 1 and 3 has assignable free lines or channels (hereinafter referred to as "channels").
  • the routing system stores in switching node 1 the maximum capacity of the link between switching nodes 1 and 3, namely, for example, 125 channels and the trunk reservation parameter associated with this link, which is 10 here, for example.
  • the routing system also stores the number of channels currently in use. From the point of view of the routing system, the link between switching nodes 1 and 3 is therefore available for overflow traffic if the sum of the channels used and the trunk reservation parameter is less than 125 (the trunk reservation guarantees the stability of a routing method in the high-load range ).
  • the switching node 1 initially establishes the connection up to the switching node 3.
  • the routing system of the switching node 3 checks the availability of the second link before continuing to set up the connection to the destination switching node 2 by checking whether the sum of occupied channels plus the trunk reservation parameter is less than the capacity of the second link is (the routing system of switching node 3 knows the maximum capacity of the link between switching nodes 3 and 2, the trunk reservation parameter of this link and the number of channels currently occupied by this link).
  • the next call for the switching node 2 if the direct route is not available, an attempt is made to route the overflowing call via the transit node 3.
  • the number of successful calls immediately following the alternative route is counted. Only when a predetermined maximum number of successfully offered calls is reached is there a cyclical change, ie the next overflowing call is then routed via the next active alternative route, ie the active alternative route via transit node 4.
  • Short-term autocorrelations in the traffic offer on the second link can be used, which increase the probability that another connection can be established in the same way immediately after a successful connection establishment.
  • the removed alternative route is included in a first set (so-called first passive set) of alternative routes if the number of calls successfully offered to the alternative route is below a certain value and in a second (passive) set of alternative routes if the number is reached or exceeded a certain value.
  • first passive set a first passive set of alternative routes if the number of calls successfully offered to the alternative route is below a certain value
  • second (passive) set of alternative routes if the number is reached or exceeded a certain value.
  • the path fan will be designated after the entry of a
  • Event e.g. command from network management or expiry of a time period
  • a certain condition e.g. falling short of a predetermined number of alternative routes in the route fan.
  • the reinitialization is carried out by refilling the route fan with those alternative routes which, according to the chronological order, have been the longest removed from the route fan.
  • First of all only alternative route from the first set of liabilities is taken into account. However, if this is not sufficient to fill the route fan, alternative routes from the second set of liabilities are also taken into account.
  • the transit node 3 determines that the link to the destination node 2 (second link) is not available, the transit node 3 triggers the connection section to the originating node 1 with a specially marked reverse message (crankback message).
  • the routing system of the originating node 1 then removes the alternative route via transit node 3 from the route fan for destination node 2.
  • the alternative routes removed from the route fan because of the unavailability on the second link are again treated as explained above.

Landscapes

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

Abstract

L'organisation dynamique du trafic d'un réseau de communication doit s'adapter à la charge de trafic de manière à en optimiser l'écoulement.' La présente invention propose une solution à ce problème en offrant un éventail dynamique de voies de débordement, compte tenu, lors de la (ré)initialisation de ce dernier, de la séquence temporelle au terme de laquelle les voies de débordement ont été retirées de l'éventail en question.
EP97947027A 1996-11-22 1997-11-03 Procede et systeme d'organisation dynamique du trafic dans un reseau de communication Withdrawn EP0941619A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19648479 1996-11-22
DE19648479 1996-11-22
PCT/DE1997/002545 WO1998024247A1 (fr) 1996-11-22 1997-11-03 Procede et systeme d'organisation dynamique du trafic dans un reseau de communication

Publications (1)

Publication Number Publication Date
EP0941619A1 true EP0941619A1 (fr) 1999-09-15

Family

ID=7812519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97947027A Withdrawn EP0941619A1 (fr) 1996-11-22 1997-11-03 Procede et systeme d'organisation dynamique du trafic dans un reseau de communication

Country Status (4)

Country Link
US (1) US6411701B1 (fr)
EP (1) EP0941619A1 (fr)
CN (1) CN1106771C (fr)
WO (1) WO1998024247A1 (fr)

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Also Published As

Publication number Publication date
WO1998024247A1 (fr) 1998-06-04
CN1238891A (zh) 1999-12-15
US6411701B1 (en) 2002-06-25
CN1106771C (zh) 2003-04-23

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