Mobile Terminal Service Indication During Roaming
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Solution Overview
Problem
Current mobile telecommunications standards do not allow mobile terminals to easily and quickly determine available services in a new geographic area during roaming, leading to unnecessary energy consumption through active service searches after inter-system transfers or reinitialization.
Innovation Solution
A method where the cellular network authenticates the terminal, determines a list of available services in the new area, and transmits this list to the terminal upon registration or location update, including services accessible due to roaming agreements between networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal performs active service search after inter-system transfer or reinitialization, then the terminal can find available services, but unnecessary energy is consumed
Solution Approach 1:
The network performs preliminary action by determining and storing the list of available services in the second geographic area before the terminal needs them. When the terminal registers or performs location update in the new area, the network proactively provides this pre-prepared service list, eliminating the need for the terminal to perform energy-consuming active service searches.
2Loss of information
If the terminal performs active service search to find services in a new area, then service availability is determined, but the process is time-consuming and complex
Solution Approach 1:
The network determines the list of available services in advance during location area configuration, before any terminal needs this information. This preliminary determination eliminates the time delay associated with terminal-based service discovery searches, as the information is ready immediately when the terminal registers in the new area.
Solution Approach 2:
The network acts as an intermediary that centralizes service availability information management. Instead of terminals independently searching for services, the network maintains and distributes service lists to terminals upon registration, simplifying the information acquisition process and reducing complexity.
3Device complexity
If service availability is defined statically by the network independently of reception quality, then network management is simplified, but terminals cannot quickly know available services during roaming
Solution Approach 1:
The network performs preliminary determination of service availability in each location area during configuration phases, maintaining static service definitions that simplify network management. This pre-determined service list is then automatically provided to terminals during registration or location update procedures, enabling quick service information access without increasing network management complexity.
Data Source
AI summary
This invention relates to a method of indicating available services to a mobile telecommunications terminal roaming between a first geographic area and a second geographic area. When the terminal is authenticated in the second geographic area, a list which comprises the services physically available in the said second geographic area is determined and is transmitted to the terminal.