WO1998024247A1 - Verfahren und routing-system zur dynamischen verkehrslenkung in einem kommunikationsnetz - Google Patents
Verfahren und routing-system zur dynamischen verkehrslenkung in einem kommunikationsnetz Download PDFInfo
- Publication number
- WO1998024247A1 WO1998024247A1 PCT/DE1997/002545 DE9702545W WO9824247A1 WO 1998024247 A1 WO1998024247 A1 WO 1998024247A1 DE 9702545 W DE9702545 W DE 9702545W WO 9824247 A1 WO9824247 A1 WO 9824247A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- route
- alternative
- fan
- routes
- alternative routes
- Prior art date
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.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/308,752 US6411701B1 (en) | 1996-11-22 | 1997-11-03 | Method and system of dynamic traffic control in a communication network |
EP97947027A EP0941619A1 (de) | 1996-11-22 | 1997-11-03 | Verfahren und routing-system zur dynamischen verkehrslenkung in einem kommunikationsnetz |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19648479 | 1996-11-22 | ||
DE19648479.0 | 1996-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998024247A1 true WO1998024247A1 (de) | 1998-06-04 |
Family
ID=7812519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/002545 WO1998024247A1 (de) | 1996-11-22 | 1997-11-03 | Verfahren und routing-system zur dynamischen verkehrslenkung in einem kommunikationsnetz |
Country Status (4)
Country | Link |
---|---|
US (1) | US6411701B1 (de) |
EP (1) | EP0941619A1 (de) |
CN (1) | CN1106771C (de) |
WO (1) | WO1998024247A1 (de) |
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JP2003522600A (ja) * | 2000-02-15 | 2003-07-29 | ザ、プロクター、エンド、ギャンブル、カンパニー | 熱セルを有する吸収性物品 |
CN1330214C (zh) * | 2004-02-02 | 2007-08-01 | 华为技术有限公司 | 无线局域网用户终端重新选择运营网络的交互方法 |
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- 1997-11-03 WO PCT/DE1997/002545 patent/WO1998024247A1/de not_active Application Discontinuation
- 1997-11-03 CN CN97199992.9A patent/CN1106771C/zh not_active Expired - Fee Related
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003522600A (ja) * | 2000-02-15 | 2003-07-29 | ザ、プロクター、エンド、ギャンブル、カンパニー | 熱セルを有する吸収性物品 |
JP4869532B2 (ja) * | 2000-02-15 | 2012-02-08 | ザ プロクター アンド ギャンブル カンパニー | 熱セルを有する吸収性物品 |
CN1330214C (zh) * | 2004-02-02 | 2007-08-01 | 华为技术有限公司 | 无线局域网用户终端重新选择运营网络的交互方法 |
US7904087B2 (en) | 2004-02-02 | 2011-03-08 | Huawei Technologies Co., Ltd. | Method and system for WLAN user equipment accessing new operation network |
Also Published As
Publication number | Publication date |
---|---|
CN1106771C (zh) | 2003-04-23 |
US6411701B1 (en) | 2002-06-25 |
EP0941619A1 (de) | 1999-09-15 |
CN1238891A (zh) | 1999-12-15 |
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