HLR HSS Routing Information Management for Roaming IMS Sessions
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Solution Overview
Problem
Current solutions for allowing roaming access to IP multimedia application services across diverse networks are resource-intensive, particularly in terms of bandwidth and time, due to the need for extensive data calls and messaging to maintain accurate routing information for roaming mobile devices.
Innovation Solution
A system and method where the Home Location Register (HLR) or Home Subscriber Server (HSS) stores the address of application services associated with mobile devices, enabling efficient establishment of communication sessions by providing the address of the application service when subsequent requests are made, thereby reducing network traffic and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distributed method is used to maintain mobile device addresses at each switch throughout the network, then routing information accuracy is improved, but network bandwidth consumption and time resources increase significantly
Solution Approach 1:
The patent extracts the address maintenance function from distributed switches and concentrates it in the HSS. Instead of every switch maintaining and propagating device addresses throughout the network, the HSS alone stores and manages the binding between mobile device identifiers and their current location, eliminating the need for widespread address propagation and reducing network bandwidth consumption.
Solution Approach 2:
The HSS acts as an intermediary between the mobile device and the network switches. When a device moves to a new location, the HSS updates its records and serves as the central authority for routing information, eliminating the need for direct address propagation between switches and reducing overall network traffic.
2Measurement precision
If extensive data calls and messaging are used to maintain routing information across the network, then routing information accuracy is improved, but time consumption increases
Solution Approach 1:
The patent removes the time-consuming address propagation process from the network infrastructure. By extracting the address maintenance function to the HSS, the system eliminates multiple data calls and messaging events that would otherwise be required to propagate device locations throughout the network, significantly reducing time consumption.
Solution Approach 2:
The HSS performs preliminary action by maintaining up-to-date routing information in advance. When a mobile device moves, the HSS proactively updates its records before any communication session is initiated, ensuring routing information is already accurate and eliminating the need for time-consuming lookup procedures during active sessions.
3Adaptability or versatility
If mobile devices register with visited networks to access IMS application services, then service accessibility is improved, but network resource allocation complexity increases
Solution Approach 1:
The HSS serves multiple functions: it authenticates mobile devices, manages subscriber profiles, and maintains routing information for roaming devices. By making the HSS a universal resource that handles all these functions centrally, the patent simplifies network resource allocation while maintaining service accessibility across visited networks.
Data Source
AI summary
A system and method to assist in establishing a communication session to a mobile device having a registered IMS session in a visited network, or having both a registered IMS session and a circuit-switched session in a visited network. When a mobile device establishes an IMS session with an application service in a visited network, the address of the application service and the identity of the mobile device is transmitted to the Home Location Register (HLR) and/or Home Subscriber Server (HSS) associated with the mobile device. The HLR or HSS stores the address of the application service in conjunction with the identity of the mobile device. When requests to establish a communication session with the mobile device are made, the HLR or HSS provides the address of the application service that is associated with the mobile device in the visited network to allow a communication session to be established.