Network Gateway Node Combined HLR-HSS Database IMS Routing

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Solution Overview

Problem

The existing methods for routing a call setup request from a non-IMS network to a destination node in an IMS network result in unnecessary intensive network signaling and delays, leading to inefficient use of IMS nodes.

Innovation Solution

A Network Gateway Node (NGN) that interfaces a combined database node comprising a Home Location Register (HLR) and a Home Subscriber Server (HSS) is introduced, which reduces the number of database node accesses and involved nodes by obtaining routing information from a single combined database node, thereby optimizing call setup routing in the IMS network.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the existing call setup method is used with separate HLR and HSS database nodes, then routing information can be obtained, but intensive network signaling and delays occur due to multiple database node accesses

Engineering Contradiction:

Improverouting information accuracyVSAvoidcall setup delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines the HLR and HSS database nodes into a single unified database node. This merging eliminates the need for multiple separate database accesses during call setup, reducing signaling overhead and call setup delays while maintaining the ability to provide accurate routing information for IMS service subscribers

Inventive Principle:

Principle #5Merging (Combining)

2Loss of information

If multiple database node accesses are performed for call setup, then routing information can be obtained, but network signaling becomes intensive and node utilization becomes inefficient

Engineering Contradiction:

Improverouting information completenessVSAvoidnumber of database node accesses

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The unified database node consolidates HLR and HSS functionalities into a single access point. This reduces the complexity of the call setup process by eliminating multiple sequential database node accesses while maintaining complete routing information retrieval capabilities through a single unified interface

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the GMSC and I-CSCF both access the database separately, then routing information is obtained, but the call setup process involves too many nodes and creates delays

Engineering Contradiction:

Improverouting information accuracyVSAvoidcall setup efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges the database access functions of the GMSC and I-CSCF into a single unified access to the combined HLR-HSS database node. This eliminates redundant database queries and reduces the number of involved nodes in the signaling path, thereby improving call setup efficiency while maintaining accurate routing information delivery

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP2380338B1Setting up a call from a non- IMS to an IMS network whereby the gateway interfaces the hss

Publication Date: 2018.02.14 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

The application relates to a method in a telecommunication system for setting up a call from a non-Internet Protocol Multimedia Subsystem, non-IMS, telecommunication network (200) comprising a Network Gateway Node, NGN (201), to a destination node (202) in an IMS network (203), wherein the destination node serves a called terminal (204). In the prior art, the GMSC obtains routing information from the HLR and the I-CSCF obtains routing information from the HSS. It is considered that the number of database node access can be advantageously decreased by obtaining the address of the destination node in the IMS by accessing a combined database node comprising HLR and HSS. Therefore, the NGN interfaces a combined database (205) comprising a home Location Register, HLR, and a Home Subscriber Server, HSS, wherein the NGN routes the call to the destination node in the IMS network, of which address is determined by information received from the combined database node.