Cellular Connection Management via Location Update Reject Analysis
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Solution Overview
Problem
In cellular communication networks, location area update rejections can lead to significant delays due to incorrect handling of radio resource connection release messages, causing errors and degrading user connection quality when mobile devices attempt to re-attach using either new or existing connections without determining the necessity of a release message.
Innovation Solution
A method in a mobile communication device to determine if a radio resource connection release message is issued with a location update reject message, and if so, initiate re-attachment using a new connection after the existing connection is torn down, or use an existing connection if no release message is issued, thereby avoiding delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device always initiates attach procedure using a new radio resource connection after location update reject, then connection reliability is improved, but connection establishment time increases
Solution Approach 1:
The patent applies dynamics by making the attach procedure adaptive rather than static. The mobile device dynamically selects between using an existing radio resource connection or establishing a new one based on the presence of a connection release message in the location update reject message. This dynamic adjustment optimizes both reliability and connection establishment time by choosing the appropriate path in different scenarios.
Solution Approach 2:
The patent changes the parameter of connection establishment approach based on the location update reject message content. When a connection release message is present, the device changes to using a new radio resource connection; when absent, it maintains the existing connection. This parameter change resolves the contradiction by adapting the connection strategy to the specific network state.
2Loss of time
If the mobile device uses an existing radio resource connection for attach procedure, then connection establishment time is reduced, but connection reliability deteriorates
Solution Approach 1:
The patent uses feedback from the location update reject message (specifically the presence or absence of a connection release message) to determine the appropriate attach procedure. This feedback mechanism ensures that the device only uses the existing connection when it is still valid and reliable, while switching to a new connection when the existing one has been released by the network, thus resolving the reliability concern.
3Device complexity
If the network sections into location areas comprising multiple cells, then network complexity is reduced, but location update accuracy decreases
Solution Approach 1:
The patent applies segmentation by dividing the network into location areas, where each location area comprises multiple cells. This segmentation reduces network complexity by allowing the network to track mobile devices at the location area level rather than individual cell level. The compromise in location precision is acceptable in exchange for the significant reduction in signaling overhead and database complexity.
Data Source
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AI summary
In accordance with an example embodiment of the present invention, there is provided an apparatus configured to receive a location update reject message and to determine whether a radio resource connection release message is issued in connection with the location update reject message. The apparatus is further configured to, responsive to a determination that a radio resource connection release message is issued in connection with the location update reject message, initiate an attach procedure using a new radio resource connection, and responsive to a determination that no radio resource connection release message is issued in connection with the location update reject message, to initiate an attach procedure using an existing radio resource connection.