Roaming Emergency Number Table Management
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Solution Overview
Problem
Current methods for handling emergency calls in mobile communication networks, especially when a user is roaming, require cumbersome static configuration of local emergency numbers across multiple networks, leading to errors and inefficiencies due to the complexity of maintaining correspondence tables.
Innovation Solution
A method where the home network dynamically obtains an emergency number table from the visited network, associating local emergency numbers with uniform resource identifiers, allowing for the proper handling of emergency calls without prior static configuration, and optimizing bandwidth usage by requesting the table only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static configuration of emergency numbers is used across multiple networks, then emergency call handling is enabled, but configuration complexity and error risk increase significantly
Solution Approach 1:
The patent extracts the emergency number table from the home network configuration and relocates it to the visited network. The visited network now provides its own local emergency number table to roaming terminals, eliminating the need for the home network to statically configure emergency numbers for all possible visited networks. This extraction resolves the contradiction by maintaining reliability (emergency calls work locally) while reducing configuration complexity (home network no longer needs to manage foreign emergency numbers).
Solution Approach 2:
The visited network performs self-service by providing its own emergency number table to roaming terminals through the emergency number table indication mechanism. Instead of relying on the home network to pre-configure all emergency numbers, each visited network independently provides its local emergency numbers, reducing the overall system configuration burden while ensuring accurate local emergency call routing.
2Measurement precision
If emergency number table is continuously updated, then accuracy is maintained, but bandwidth consumption increases
Solution Approach 1:
The patent implements periodic action by having the home network request the emergency number table from the visited network only at specific moments: during initial terminal attachment and when the terminal moves to a different visited network. This on-demand periodic retrieval maintains table accuracy without requiring continuous updates, thereby conserving bandwidth while ensuring the terminal always has the current emergency numbers for its location.
3Adaptability or versatility
If home network manages all emergency numbers, then centralized control is achieved, but maintenance difficulty increases
Solution Approach 1:
The patent segments the emergency number management responsibility: the home network maintains centralized control for internationally recognized emergency numbers, while the visited network manages its own local emergency number table. This segmentation allows each network to independently maintain its own emergency numbers, simplifying maintenance (each network only manages its local numbers) while preserving centralized control capabilities for standard emergency services through the home network's continued management of international emergency numbers.
Data Source
AI summary
A method for processing a registration request from a user terminal of a communication network, referred to as home network, the home network being configured to provide multimedia services to the terminal, the terminal being attached to another communication network, referred to as visited network, interconnected with the home network. The method is implemented in a local facility of the home network and includes: upon receiving a registration request from the terminal of the user, the registration request having been transmitted by the visited network, obtaining from an emergency number table of the visited network, the table associating, with an emergency number local to the visited network, a uniform resource identifier corresponding to the number, and the emergency number table received from the visited network by the home network following reception of the registration request or a previous registration request from a user terminal attached to the visited network.