Wireless Terminal Location Update During Network Congestion
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Solution Overview
Problem
In wireless communication systems, mobile terminals face issues with missing paging due to network congestion, leading to failed location updates and subsequent unavailability of mobile terminating calls, as they do not initiate necessary update procedures while a congestion timer is running.
Innovation Solution
The method involves adaptively changing update status parameters (GPRS, MM, and EPS) to indicate failed procedures when a congestion timer is running, and entering specific states (GMM-REGISTERED.ATTEMPTING-TO-UPDATE, MM IDLE, ATTEMPTING TO UPDATE, EMM-REGISTERED.ATTEMPTING-TO-UPDATE) to initiate update procedures upon timer expiration, ensuring registration with the network and avoiding missed paging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal does not initiate location update procedures while a congestion timer is running, then the terminal avoids network congestion and reduces signaling overhead, but the terminal fails to register with the network and misses paging messages
Solution Approach 1:
The patent introduces a dynamic state machine with multiple states (IDLE, ATTEMPTING_TO_UPDATE, REGISTERED) that allows the terminal to adapt its behavior based on congestion conditions. When congestion is detected, the terminal transitions to ATTEMPTING_TO_UPDATE state, which changes the update status parameter from GU1 to GU2, enabling location updates to be triggered upon timer expiration rather than being blocked entirely.
Solution Approach 2:
The patent changes the GPRS update status parameter from GU1 (UPDATED) to GU2 (NOT UPDATED) when congestion is detected and the terminal enters the ATTEMPTING_TO_UPDATE state. This parameter change enables the terminal to initiate location update procedures after timer expiration, resolving the contradiction between avoiding congestion and maintaining network registration.
2Loss of information
If the mobile terminal changes location area identity while congestion timer is running, then the terminal can track location changes, but the terminal still cannot initiate updating procedures and remains unregistered
Solution Approach 1:
The patent performs preliminary actions by detecting location area changes and changing the update status parameter to GU2 before the congestion timer expires. This prepares the terminal to initiate location update procedures immediately upon timer expiration, ensuring both location tracking and network registration are maintained during congestion periods.
Data Source
AI summary
A method of a terminal and the terminal are provided. The method includes detecting a location area change when a congestion timer is running and one of a general packet radio service (GPRS) update status indicating “GU1 UPDATED,” a mobility management (MM) update status indicating “U1 UPDATED,” and an evolved packet system “EPS” update status indicating “EU1 UPDATED” is indicated; adaptively changing the GPRS update status to “GU2 NOT UPDATED,” the MM update status to “U2 NOT UPDATED,” and the EPS update status to “EU2 NOT UPDATED”; and entering a state of “GMM-REGISTERED.ATTEMPTING-TO-UPDATE,”“MM IDLE, ATTEMPTING TO UPDATE,” or “EMM-REGISTERED.ATTEMPTING-TO-UPDATE,” in accordance with one of “GU2 NOT UPDATED,”“U2 NOT UPDATED,” and “EU2 NOT UPDATED.”