CN100466637C - 一种信令消息负荷分担的方法 - Google Patents

一种信令消息负荷分担的方法 Download PDF

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CN100466637C
CN100466637C CNB2005101292243A CN200510129224A CN100466637C CN 100466637 C CN100466637 C CN 100466637C CN B2005101292243 A CNB2005101292243 A CN B2005101292243A CN 200510129224 A CN200510129224 A CN 200510129224A CN 100466637 C CN100466637 C CN 100466637C
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signalling
point
signaling
link
message
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CN1984082A (zh
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宋鑫
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

本发明是一种信令消息负荷分担的方法，消息传递部分第3级进行信令消息的负荷分担不根据信令消息的消息信令单元中信令链路选择码选择路由，而是根据消息信令单元中电路识别码的中间或者高四位比特选择路由，选择路由和选择链路的原则不同，选择路由后，消息传递部分第3级根据消息信令单元中信令链路选择码继续选择链路，这样，全部的信令链路选择码(0～15)可以用于链路的选择，能够使消息传递部分信令消息负荷分担在单条路由链路数不超过16条的不同组网方式中使用系统中所有链路承载业务，均匀且充分的利用了系统资源。

Description

一种信令消息负荷分担的方法
技术领域
本发明涉及信令技术，尤其是涉及一种消息传递部分(MTP)信令消息负荷分担的方法。
背景技术
在现代通信网中，信令系统是其重要组成部分，它是用户以及通信网中各个节点相互交换信息的共同语言。在目前的信令系统中，7号信令系统(SS7)是比较常用的一种，它是一种用来传送通信网各个节点之间网络信令的共路信令系统，其信令容量大、传送速度快，不但可以传送传统的中继线路接续信令，还可以传送各种与电路无关的管理、维护、信息查询等消息，因此得到了广泛应用，目前我国已经形成了较为完整的7号信令网络。
7号信令系统采用功能模块化的结构，主要包括MTP和用户部分(UP)。7号信令系统可以划分为4级功能结构，第1级为信令数据链路功能，第2级为信令链路功能，第3级为信令网络功能，第4级为用户部分，其中前3级属于MTP，第4级属于UP。第3级完成的信令网络功能包括信令网络的操作和管理，以及信令传递过程，其信令网络功能的实现由Q.704协议完成，并由两部分组成：
(1)信令网络管理功能：其作用是控制消息的编路和信令网络设备的组合或重新组合，以维持或恢复正常消息传递能力。
(2)信令消息处理功能：其作用是将消息引导到适当的信令链路或用户部分。
7号信令系统中根据不同的应用采用三种信令单元：消息信令单元(MSU)，链路状态信令单元(LSSU)，填充信令单元(FISU)。在传送信令消息时使用MSU，信令消息包括电话用户部分(TUP)消息、综合业务数字网用户部分(ISUP)消息等；在接通、恢复和退出信令链路时使用LSSU；在正常工作的信令链路上无信号消息业务时使用FISU。
Q.704协议规定，MTP第3级根据收到信令消息MSU中的链路选择码(SLS)进行信令消息的负荷分担。SLS是一个4比特的字段，其值的范围为0～15。当前技术中MTP第3级进行信令消息的负荷分担的原则是首先根据MSU中的SLS选择路由，然后继续根据SLS选择链路(Q.704协议规定，选择链路必须使用MSU中的SLS)。这样，信令消息选择路由和选择链路的依据相同，其结果是信令消息的负荷分担不能使用系统中所有链路承载业务。
如图1所示的组网方式，信令消息由信令点(SP)1经由两个信令转接点(STP)到达SP2，即SP1与SP2之间存在两条路由，一条为SP1-STP1-SP2，另一条为SP1-STP2-SP2，SP1到STP1和STP2之间分别有16条链路。当SP1发送信令消息到SP2时，首先MTP第3级根据MSU中的SLS选择路由，为了负荷分担，MTP第3级会将一半SLS分配给SP1-STP1-SP2的路由(假设为0～7)，一半SLS分配给SP1-STP2-SP2的路由(假设为8～15)。选择路由后，MTP第3级需要根据MSU消息中的SLS继续选择链路，此时由于分配到SP1-STP1之间链路上的SLS的值为0～7，因此SP1-STP1之间根据SLS只能使用8条链路承载业务，其余8条链路空闲，不承载业务；同样，SP1-STP2之间根据SLS只能使用8条链路承载业务，其余8条链路空闲，不承载业务。
如图2所示的组网方式，STP采用多信令点，是一种信令系统的多路由组网方式，其中每个信令点PCm到SP2都有n(≦16)条链路，所有链路的总和数大于16条。当SP1发送信令消息到SP2时，首先MTP第3级根据MSU中的SLS选择路由，为了负荷分担，MTP第3级会根据STP信令点的数目将SLS平分至所有路由，假设STP有4个信令点，即m＝4，则分配到每个信令点的SLS的值的范围为4。假设分配到PC1的SLS的值为0～3，选择路由后，MTP第3级需要根据MSU中的SLS继续选择链路，此时由于分配到PC1-SP2之间链路上的SLS的值为0～3，因此PC1-SP2之间根据SLS只能使用4条链路承载业务，其余链路空闲，不承载业务；同理，其余信令点与SP2之间发生相同的链路使用情况。
综上所述，当前的MTP信令消息负荷分担方法针对默写组网方式的信令系统存在着无法充分利用系统所有链路的不足，造成系统资源的浪费。
发明内容
针对以上现有技术的不足，本发明的目的在于，提供一种方法，能够使消息传递部分信令消息负荷分担在单条路由链路数不超过16条的不同组网方式中使用系统中所有链路承载业务。
为实现本目的，本发明是一种信令消息负荷分担的方法，应用于信令网络中，所述信令网络采用两路由组网方式，包括信令点1、信令点2、信令转接点1和信令转接点2，其中，所述信令点1到所述信令转接点1和所述信令转接点2之间分别有16条链路；
所述信令消息负荷分担的方法，包括步骤：
(1)消息传递部分第3级将一半电路识别码的中间或者高四位比特的值分配给信令点1-信令转接点1-信令点2路由，一半电路识别码的中间或者高四位比特的值分配给信令点1-信令转接点2-信令点2路由；
(2)选择路由后，每一条路由中，消息传递部分第3级根据信令消息的消息信令单元中信令链路选择码选择全部16条链路承载业务。
所述的信令消息包括电话用户部分消息和综合业务数字网用户部分消息。
步骤(2)所述的信令链路选择码是步骤(1)所述的电路识别码的最低四位比特。所述的信令链路选择码的值的范围是0～15。
本发明还是一种信令消息负荷分担的方法，应用于信令网络中，所述信令网络采用多路由组网方式，包括信令点1、信令转接点和信令点2，其中，信令转接点采用多信令点，每个信令点与信令点2之间有n条链路，其中，n≦16；
在所述多路由组网方式中实现信令消息负荷分担的步骤为：
(A1)消息传递部分第3级将电路识别码中间或者高四位比特的值均匀分配给所述的信令转接点中的每个信令点；
(B1)选择路由后，消息传递部分第3级根据信令链路选择码选择链路，使信令转接点的每个信令点与信令点2之间最多可以使用全部16条链路承载业务。
步骤(B1)所述的信令链路选择码是步骤(A1)所述的电路识别码的最低四位比特。所述的信令链路选择码的值的范围是0～15。
实施本发明，可以使消息传递部分信令消息的负荷分担更加均匀，系统资源的利用更充分，解决了现有信令系统中不同组网方式下的信令消息的负荷分担问题。
附图说明
图1是一种信令系统的两路由组网方式示意图；
图2是一种信令系统的多路由组网方式示意图；
图3是TUP消息和ISUP消息的MSU中CIC的中间或者高四位比特示意图。
具体实施方式
本发明的信令消息负荷分担方法在于，MTP第3级进行信令消息的负荷分担不根据信令消息的MSU中SLS选择路由，而是根据MSU中电路识别码(CIC)的中间或者高四位比特选择路由。本发明中，选择路由和选择链路的原则不同，选择路由后，MTP第3级根据MSU中SLS继续选择链路，这样，全部的SLS(0～15)可以用于链路的选择，则能够使MTP信令消息负荷分担在单条路由链路数不超过16条的不同组网方式中使用系统中所有链路承载业务。
图3是TUP消息和ISUP消息的MSU中CIC的中间或者高四位比特示意图。如图3中所示，TUP消息和ISUP消息的MSU中均包含如下内容：目的信令点编码DPC(Destination Point Code)、源信令点编码OPC(0riginating Point Code)以及SLS。由图3中可以看出，SLS实际为CIC的最低四位比特：图3上图中SLS占用CIC的最低四位比特；图3下图中，SLS与CIC在MSU中分开存放，SLS的值与CIC的最低四位比特的值相同。
针对如图1中的组网方式，实施本发明，SP1与SP2之间存在两条路由，一条为SP1-STP1-SP2，另一条为SP1-STP2-SP2，SP1到STP1和STP2之间分别有16条链路。当SP1发送信令消息到SP2时，首先MTP第3级根据MSU中的CIC的中间或者高四位比特选择路由，为了负荷分担，MTP第3级会将一半CIC的中间或者高四位比特的值分配给SP1-STP1-SP2的路由(假设为0～7)，一半CIC的中间或者高四位比特的值分配给SP1-STP2-SP2的路由(假设为8～15)。选择路由后，MTP第3级根据MSU消息中的SLS继续选择链路，此时由于分配到SP1-STP1之间链路上的SLS的值为0～15，因此SP1-STP1之间根据SLS能够使用全部16条链路承载业务；分配到SP1-STP2之间链路上的SLS的值同样为0～15，因此SP1-STP2之间根据SLS同样能够使用全部16条链路承载业务。
针对如图2中的组网方式，STP采用多信令点，其中每个信令点PCm到SP2都有n(≦16)条链路，所有链路的总和数大于16条。实施本发明，在选择路由时，MTP第3级将CIC中间或者高四位比特的值均匀分配给STP中每一个信令点，此时由于选择路由时不是根据MSU中的SLS进行的，因此分配到STP中PCm到SP2链路上的SLS的值仍为0～15，在选择链路时，MTP第3级根据MSU消息中的SLS选择链路，这样就保证了STP中PCm到SP2最多可以使用全部16条链路承载业务。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。

Claims (7)

1.一种信令消息负荷分担的方法，应用于信令网络中，其特征在于：所述信令网络采用两路由组网方式，包括信令点1、信令点2、信令转接点1和信令转接点2，其中，所述信令点1到所述信令转接点1和所述信令转接点2之间分别有16条链路；
所述信令消息负荷分担的方法，包括步骤：
(1)消息传递部分第3级将一半电路识别码的中间或者高四位比特的值分配给信令点1-信令转接点1-信令点2路由，一半电路识别码的中间或者高四位比特的值分配给信令点1-信令转接点2-信令点2路由；
(2)选择路由后，每一条路由中，消息传递部分第3级根据信令消息的消息信令单元中信令链路选择码选择全部16条链路承载业务。
2.如权利要求1所述的方法，其特征在于：所述的信令消息包括电话用户部分消息和综合业务数字网用户部分消息。
3.如权利要求1所述的方法，其特征在于：步骤(2)所述的信令链路选择码是步骤(1)所述的电路识别码的最低四位比特。
4.如权利要求3所述的方法，其特征在于：所述的信令链路选择码的值的范围是0～15。
5.一种信令消息负荷分担方法，应用于信令网络中，其特征在于：所述信令网络采用多路由组网方式，包括信令点1、信令转接点和信令点2，其中，信令转接点采用多信令点，每个信令点与信令点2之间有n条链路，其中，n≦16；
在所述多路由组网方式中实现信令消息负荷分担的步骤为：
(A1)消息传递部分第3级将电路识别码中间或者高四位比特的值均匀分配给所述的信令转接点中的每个信令点；
(B1)选择路由后，消息传递部分第3级根据信令链路选择码选择链路，使信令转接点的每个信令点与信令点2之间最多可以使用全部16条链路承载业务。
6.如权利要求5所述的方法，其特征在于：步骤(B1)所述的信令链路选择码是步骤(A1)所述的电路识别码的最低四位比特。
7.如权利要求6所述的方法，其特征在于：所述的信令链路选择码的值的范围是0～15。
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