CN1108706C - 通信网中用于动态通信控制的方法和路由系统 - Google Patents
通信网中用于动态通信控制的方法和路由系统 Download PDFInfo
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Abstract
一个通信网络中的动态的传输路径控制应当如此匹配于各自在网络中存在的通信负载,即优化网络信息通过量。根据本发明的传输路径控制通过一个具有替换通路的动态的通路扇解决了这个问题,在(重新)置位的情况下仅仅接收特别选出的替换通路。
Description
发明领域
本发明涉及在通信网中用于动态通信控制的方法和路由系统。
背景技术
在一个完整相互连接的、不分级别的具有n个网络网络节点的网络中,在每个源-目标对n-2上存在具有仅2个通路路段的替换通路。在不确切加载的网络上,这些网络范围内的全部的n×(n-1)×(n-2)个替换通路中,一些通路是过载的,另一些是低载的。
不分级别地组织起来的、线路交换的通信网需要一个动态的传输路径控制(动态路由),其如此匹配各自在网络中存在的通信负载,即优化网络信息通过量。对此必须通过传输路径特别地缓和不平衡负载情况。
正如同在分级别网络中的常规传输路径控制的情况下,在一个动态的传输路径控制中首先尝试在一个或多个设计通路、大部分直接通路上建立连接。如果这是不可能的,因为例如所有的通信线路组完全被占用,则给过量通信分配替换通路。
在替换通路的选择中,在动态的和常规的传输路径控制之间存在原则上的区别。在常规的传输路径控制中,按固定不变的顺序,根据一个非占用的线路或者一个非占用的信道查找行政确定的替换通路(“固定替换路由”)。因此传输路径控制仅仅非常不充足地对非计划的、异常的负载情况作出反应。
在动态的传输路径控制的情况下,产生的过量通信被分配一个或多个激活的替换通路。这个激活的替换通路或这些激活的替换通路不是固定的,而是根据各自的动态传输路径控制方法选出的,或甚至在每次呼叫期间新确定的。与网络中的不平衡负载情况相比,这种情况例如通过短时的波动负载(空间限制的大量产生的通信,例如在灾难的情况下)和网络衰变(连接线路组缺少、缺少中继单元)而产生,动态的传输路径控制的优点在于坚固性和灵活性。此外,可以更好地补偿在网络设计的情况下的不安全性。
集中的状态控制(动态)的路由方法依靠一个网络中心的信息处理器,该信息处理器从网络节点接收关于存在的区域负载情况的信息。如此可以主要确定有利的、低负载的通路,并相应地通知网络节点。此外,在这种情况下对于网络中心、数据传输和网络节点中的附加需要的计算容量来说是很昂贵的。
分散的、状态控制(动态)的方法基于到不分级别的(部分)网络的源节点的中继线组的负载情况的回答。该方法有这样的缺点,非标准化的接口在网络节点之间要求一个同类的网络(例如仅仅一个生产者的网络节点),此外一个较高的信息发送费用是必须的。
分散的事件控制(动态)的路由方法可以获得一个性能加强,当该方法通过分析传输装置线占用事件(堵塞事件)了解当时的负载情况时。可是对此不能区分偶尔的堵塞(由提供的通信的静止拨动引起的)和差不多完全的堵塞(由不平衡负载或局部的网络过载引起的)。
在欧洲专利EP 0 696 147 A1(SAG-内部编号94P1542E)中公开了一个按照要求1前序部分的事件控制的方法。在重置初值的情况下再次选出替换通路,在这个选出的情况下没有状态信息,在该方法中可能出现,再次重激活长期堵塞的替换通路。在该重激活的替换通路中,因此在重新提供呼叫的情况下,或者已经在第一次呼叫时或者至少在几次呼叫之后断定,替换通路不再可以支配,并且因此必须从通路扇中再次清除该呼叫。
发明内容
本发明的任务在于,避免上述缺点或者比目前更好地在尽可能低的负载的替换通路上均匀分配过量负载。
根据本发明,提供了一种在通信网络中用于动态通信控制的方法,包括步骤:
a)给在一个源中继节点和一个目标节点之间的呼叫首先提供一个或多个优选的设计通路,
b)当没有设计通路可以支配时,则按照一个确定的选择模式给呼叫提供包含在一个通路扇中的替换通路,
c)在传输到按照选择模式的最近的替换通路之前,在一个预先确定的最大数目之内给过量通信提供一个从过量通信的通路扇中选出的替换通路,
d)在提供一个呼叫的情况下,一旦确定不再可以支配替换通路,一个到目前为止在通路扇中包含的替换通路就去除通路扇,
e)在出现一个确定的结果和/或满足一个确定的条件之后该通路扇被重置初值;其特征在于,
f)计算在不可以支配确定之前提供给替换通路的呼叫的数目,
g)如果上述的数目低于一个确定的值,则在替换通路的一个第一被动群中接收去除的替换通路,
h)如果上述的数目达到或超过该确定的值,则在替换通路的一个第二被动群中接收去除的替换通路,
i)通过在通路扇中重新接收来自第一被动群中的替换通路,替换通路被重置初值,
j)如果单独用来自第一被动群中的替换通路不能在一个确定的最小数目之内填满替换通路,则通过在通路扇中重新接收来自第二被动群中的替换通路,替换通路被重置初值。
优选地,在上述方法中,上述确定的值等于“1”。
优选地,在上述方法中,记录时间顺序,替换通路按照该顺序被从通路扇去除,在重置初值的情况下考虑这个时间顺序。
优选地,在上述方法中,不替换一个从通路扇中去除的替换通路。
优选地,在上述方法中,用一个来自第一被动群中的一个替换通路替换一个从通路扇去除的替换通路。
通过本发明的方法实现了,不是同低负载的替换通路一样快地重新在通路扇中接收高负载的替换通路。
附图说明
附图1是一个小的完整多回路的网络的简图。
具体实施方式
下面根据附图详细地说明按照本发明方法的实施例。
附图示出了一个小的完整多回路的网络的简图,该网络具有六个网络中继节点和在网络节点之间的通路接口(链路)的相应容量,其中链路至少包含一个中继线组。
现在假设,中继节点1有一个对于中继节点2的呼叫,可是不可以支配在这二个中继节点之间的直接路由。
此外假设,起始的通路扇,也就是说在其上一次的重置初值之后激活的替换通路的扇,包含三个替换通路,也就是通过中继节点3、4和5的双链路替换通路。
此外,以此为出发点,即由路由系统周期性地在这些激活的替换通路上均匀分配过量的通信,更确切地说按顺序分配给转移节点3、4和5。
在上述的前提条件下,路由系统首先在中继节点1上检查,激活的替换通路是否可以支配转移节点3,也就是说该系统是否具有可证实的空线路或信道(下面仅仅提及“信道”)。
为了可以进行这个检查,路由系统在中继节点1中储存在中继节点1和3之间链路的最大容量,即存储例如125个信道和附属于该替换通路的干线预定参数,该参数在此例如是10。路由系统此外存储目前使用的信道的数目。如果被使用的信道和干线预定参数的总和小于125(干线预定在高负载范围内保证路由系统的稳定),依路由系统看来,在中继节点1和3之间的链路因此对于过量通信是可以支配的。
如果第一链路是可以支配的,则中继节点1首先建立直到中继节点3的连接。中继节点3的路由系统在继续进行建立到目标中继节点2连接之前检查第二链路的可支配性,检验被占用的信道加上干线预定参数的总和是否小于第二链路的容量(中继节点3的路由系统此外了解在中继节点3和2之间的链路的最大容量、该链路的干线预定参数和该链路目前被占用的信道数目)。
如果也可以支配上述激活的替换通路的第二链路,则建立从转移节点3到目标节点2的连接。
在上述的通过转移节点3成功接续的呼叫的情况中,在最近的对于中继节点2的呼叫中,当不可以支配时直接路由再次尝试,控制通过转移节点3的过量呼叫。计算紧接着连续成功提供给替换通路的呼叫的数目。在达到一个可以预先确定的最大数目的情况下,首先由成功提供的呼叫周期性地改变,也就是说在最近的激活的替换通路上控制下一个过量的呼叫,也就是说在转移节点4上激活的替换通路。因此可以在第二链路上使用通信建议中的暂时的自动校正,其提高这种可能性,即在一个成功的连接建立之后可以紧接着在相同的通路上建立一个另外的连接。
如果在达到上述最大数目之前或在达到上述最大数目时确定一个替换通路的不可以支配(例如转移节点3确定,不可以支配到目标节点2的链路,并且触发到具有一个特殊标明的反向信号(crankback信号)的源节点1的连接接口),则替换通路被去除通路扇。
如果成功提供给替换通路的呼叫的数目低于一个确定值,在替换通路的第一群(所谓的第一被动群)中接收去除的替换通路,如果上述数目达到或超过该确定值,在替换通路的第二被动群中接收去除的替换通路。
在出现一个确定的事件(例如网络管理命令或一个时期的过程)和/或一个确定条件(例如未超过通路扇中替换通路的预先确定的数目)之后,通过重新在该通路扇中接收首先来自第一被动群的替换通路的方法,该通路扇重置初值,如果这个替换通路不足够添满该通路扇,也在该通路扇中重新接收来自第二被动群的替换通路,其中,根据替换通路的反激活、也就是说替换通路的去除通路扇的短时顺序实现替换通路的上述接收。
如果转移节点3确定,不可以支配到目标节点2的链路,既第二链路,转移节点3触发到具有一个特殊标明的反向信号(crankback信号)的源节点1的连接接口。源节点1的路由系统接着从对于目标节点2的通路扇中清除在转移节点3上的替换通路。在第二链路上不可以支配的通路如同上面说明的一样使用去除通路扇的替换通路。
Claims (5)
1.一种在通信网络中用于动态通信控制的方法,包括步骤:
a)给在一个源中继节点和一个目标节点之间的呼叫首先提供一个或多个优选的设计通路,
b)当没有设计通路可以支配时,则按照一个确定的选择模式给呼叫提供包含在一个通路扇中的替换通路,
c)在传输到按照选择模式的最近的替换通路之前,在一个预先确定的最大数目之内给过量通信提供一个从过量通信的通路扇中选出的替换通路,
d)在提供一个呼叫的情况下,一旦确定不再可以支配替换通路,一个到目前为止在通路扇中包含的替换通路就去除通路扇,
e)在出现一个确定的结果和/或满足一个确定的条件之后该通路扇被重置初值,
f)其特征在于,
g)计算在不可以支配确定之前提供给替换通路的呼叫的数目,
h)如果上述的数目低于一个确定的值,则在替换通路的一个第一被动群中接收去除的替换通路,
i)如果上述的数目达到或超过该确定的值,则在替换通路的一个第二被动群中接收去除的替换通路,
j)通过在通路扇中重新接收来自第一被动群中的替换通路,替换通路被重置初值,
k)如果单独用来自第一被动群中的替换通路不能在一个确定的最小数目之内填满替换通路,则通过在通路扇中重新接收来自第二被动群中的替换通路,替换通路被重置初值。
2.按照要求1的方法,其特征在于,上述确定的值等于“1”。
3.按照要求1或2的方法,其特征在于,
a)记录时间顺序,替换通路按照该顺序被从通路扇去除,
b)在重置初值的情况下考虑这个时间顺序。
4.按照要求1或2的方法,其特征在于,不替换一个从通路扇中去除的替换通路。
5.按照要求1或2的方法,其特征在于,用一个来自第一被动群中的一个替换通路替换一个从通路扇去除的替换通路。
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US4669113A (en) * | 1985-04-26 | 1987-05-26 | At&T Company | Integrated network controller for a dynamic nonhierarchical routing switching network |
GB8531138D0 (en) * | 1985-12-18 | 1986-01-29 | British Telecomm | Telecommunications network |
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ES2098544T3 (es) * | 1991-10-15 | 1997-05-01 | Siemens Ag | Procedimiento para la direccion no-jerarquica del trafico en una red de comunicacion. |
EP0696147A1 (de) * | 1994-08-03 | 1996-02-07 | Siemens Aktiengesellschaft | Verfahren und Routing-System zur dynamischen Verkehrslenkung in einem Kommunikationsnetz |
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1997
- 1997-11-03 CN CN97199970A patent/CN1108706C/zh not_active Expired - Fee Related
- 1997-11-03 US US09/308,551 patent/US6498844B1/en not_active Expired - Fee Related
- 1997-11-03 BR BR9713394A patent/BR9713394A/pt not_active IP Right Cessation
- 1997-11-03 EP EP97947713A patent/EP0940048B1/de not_active Expired - Lifetime
- 1997-11-03 DE DE59712576T patent/DE59712576D1/de not_active Expired - Fee Related
- 1997-11-03 WO PCT/DE1997/002544 patent/WO1998024246A1/de active IP Right Grant
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WO1998024246A1 (de) | 1998-06-04 |
US6498844B1 (en) | 2002-12-24 |
BR9713394A (pt) | 2000-03-21 |
EP0940048A1 (de) | 1999-09-08 |
DE59712576D1 (de) | 2006-04-20 |
CN1238890A (zh) | 1999-12-15 |
EP0940048B1 (de) | 2006-02-15 |
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