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Signalling in a telecommunications network

A technology for telecommunications networks and signaling nodes, applied in electrical components, selection devices, supervision/control of auxiliary connections, etc., to solve problems such as SCCP segments arriving at destinations out of sequence

Inactive Publication Date: 2002-05-15
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that even in existing SS7 networks the problem of SCCP segments arriving at their destination out of order can arise when, for example, a designated signaling link becomes unavailable during the transmission of a sequence of related SCCP segments

Method used

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  • Signalling in a telecommunications network
  • Signalling in a telecommunications network
  • Signalling in a telecommunications network

Examples

Experimental program
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Embodiment Construction

[0038] Already referenced figure 1 The various layers of the SS7 protocol stack are described. The procedures described below relate to the modification of the SCCP of the SS7 stack, and more specifically to a modification such that the SCCP of the destination signaling node is correct even if the segments of the message are received out of order at the destination node. Reassembles a fragmented SCCP user data block.

[0039] Figure 2 schematically illustrates a signaling network 1 of an overall telecommunication network, wherein a pair of signaling nodes 2,3 are connected to allow signaling traffic to be transferred between the nodes 2,3. Each of nodes 2, 3 is provided with an SS7 protocol stack (see figure 1 ) to enable these nodes to transfer data between the signaling network and various application and user parts. Each of the signaling nodes 2 , 3 is connected to an SS7 / IP gateway 4 , 5 providing an interface between the SS7 nodes 2 , 3 and the IP network 6 . The gate...

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Abstract

A method of reassembling an ordered sequence of Signalling Connection and Control Part (SCCP) message segments at the SCCP of a signalling node of a telecommunications network, where said message segments are received out of order at the signalling node. The method comprises the steps of: receiving a first of the message segments at the SCCP and initiating a reassembly process for the sequence to which the received segment belongs. The received segment is stored in a memory as part of said initiated process, and thereafter the remaining segments of the SCCP message are also received and stored in the same memory. The received segments are then concatenated in the correct order to obtain an SCCP user data block. The reassembled SCCP user data block is passed to an SCCP user.

Description

technical field [0001] The present invention relates to signaling in telecommunication networks, and more particularly to the use of Signaling System No. 7 (SS7) in telecommunication networks. Background technique [0002] In modern telecommunication networks, a large amount of signaling information is constantly exchanged between signaling points (SPs) of the network. Examples of SPs are network switches, databases, etc. The actual signaling information that is exchanged is related to a specific telephone call, for example concerning call setup or termination or concerning network management functions. Complex protocols were created to handle the exchange of signaling information. In particular, Signaling System No. 7 (SS7) defines (subject to specific country variations) a set of protocol parts (or layers) capable of handling the signaling needs of modern networks. [0003] figure 1 The "architecture" of SS7 is shown schematically (it should be understood that portions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M7/06H04Q3/00
CPCH04Q3/0025
Inventor R·马丁卡贝洛
Owner TELEFON AB LM ERICSSON (PUBL)
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