Mobile Device Cell Selection Using Stored IP Session History
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Solution Overview
Problem
In UMTS networks, the limited number of concurrent PDP contexts supported by routing areas can lead to service delays and deactivation of active PDP contexts when additional services are requested, especially in overlay situations where cells with different LACs overlap and support different numbers of concurrent PDP contexts.
Innovation Solution
A method in a mobile device that stores the number of IP sessions available for each network area and performs cell selection based on the stored history of concurrent IP sessions, preferentially choosing cells that can support a higher number of sessions, even if it means switching from a currently serving cell that cannot accommodate the request.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile device uses conventional cell selection criteria, then the device can maintain simple cell selection logic, but the number of concurrent IP sessions is limited by the routing area's PDP context capacity
Solution Approach 1:
The mobile device performs preliminary actions by storing history information about the number of IP sessions supported by previously visited network areas before cell selection is needed. This pre-stored data enables the device to make informed cell selection decisions without complex real-time calculations, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The system implements feedback mechanisms where the mobile device uses history information from previous network area experiences to guide future cell selection decisions. This feedback loop allows the device to adapt to network capabilities dynamically while maintaining relatively simple selection logic based on historical patterns.
2Adaptability or versatility
If the mobile device requests additional IP sessions in a routing area with limited PDP contexts, then more services can be supported, but existing PDP contexts may be deactivated or services delayed
Solution Approach 1:
The mobile device performs preliminary cell selection based on stored history information about network area capabilities before IP session establishment is needed. This prevents the device from entering routing areas that cannot support required numbers of concurrent IP sessions, thereby avoiding PDP context deactivation and service delays.
Solution Approach 2:
The history information acts as an intermediary between the mobile device and the network routing areas. It mediates the interaction by providing the device with advance knowledge of network capabilities, allowing it to make informed decisions about which routing areas to select without risking PDP context limitations.
3Adaptability or versatility
If the mobile device switches to a different cell to access more IP sessions, then service availability is enhanced, but the device must leave the currently serving cell
Solution Approach 1:
The mobile device autonomously performs cell selection based on its own stored history information without requiring network intervention or manual user input. The device self-determines the optimal cell for IP session establishment, making the process transparent to the user while enhancing service availability.
Data Source
AI summary
A method in a mobile device is provided. The method includes storing the number of IP (Internet protocol) sessions available to the mobile device for each of a number of network areas; and when the mobile device is in a location where two of the network areas overlap, performing cell selection based on the stored number of IP sessions for each of the overlapping network areas.