AT Command Processing During Mobile Network Mode Switching
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Solution Overview
Problem
Multi-mode mobile phones face challenges in processing AT commands when they lose coverage due to poor signal strength or during mode switching, as existing methods fail to ensure timely and effective transmission of commands to the correct network module, leading to denied or incomplete command execution.
Innovation Solution
Implementing a backup mode and caching mechanism where the protocol stack records both current and backup modes, allowing the AT Interpreter module to send AT commands to the corresponding Non-Access Stratum (NAS) module for processing, and updating modes during switching operations to ensure command caching and execution after signal restoration or mode change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile phone uses a single current mode to process AT commands, then the command processing is simple and direct, but the command cannot be processed correctly when coverage is lost or mode switching occurs
Solution Approach 1:
The patent applies preliminary action by pre-recording the first camped mode in the protocol stack before coverage loss or mode switching occurs. When the current mode becomes invalid, the system can immediately retrieve the pre-stored first camped mode to process AT commands, avoiding command loss without requiring complex real-time mode detection mechanisms.
Solution Approach 2:
The patent introduces an intermediary mechanism where the first camped mode acts as a bridge between the invalid current mode and the available backup modes. The AT command is processed using the first camped mode as an intermediate reference, enabling continuous command processing even when the primary mode is unavailable.
2Reliability
If the mobile phone caches AT commands during mode switching, then command execution is ensured after switching, but the command processing time is increased
Solution Approach 1:
The system performs preliminary action by determining whether mode switching is in progress before caching AT commands. When switching is detected, commands are cached in advance with their corresponding modes recorded. This allows the system to prepare command queues beforehand, reducing the overall processing time delay while ensuring no commands are lost during transitions.
Solution Approach 2:
The patent applies dynamics by making the AT command processing mode adaptive - switching between immediate processing and caching based on the current system state. The system dynamically adjusts its behavior: when mode switching is detected, it caches commands; when stable, it processes immediately. This dynamic adaptation optimizes the balance between reliability and processing time.
3Adaptability or versatility
If the mobile phone switches between multiple network modes, then service continuity is maintained, but the difficulty of determining the correct processing mode increases
Solution Approach 1:
The patent applies preliminary action by pre-recording the first camped mode in the protocol stack before any mode changes occur. This pre-stored mode information serves as a reliable reference point that remains valid even when the current mode becomes invalid during switching, eliminating the need for complex real-time mode detection and resolution algorithms.
Solution Approach 2:
The patent uses copying by creating a preserved copy of the first camped mode information and storing it in the protocol stack. This copy remains intact during mode transitions and can be retrieved when needed, providing a reliable reference without requiring the system to re-detect or re-measure the current mode state.
Data Source
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AI summary
Method and device for processing an AT command when a mobile phone loses coverage or is performing mode switching. If the mobile phone camps on a first mode after being powered on, a protocol stack sets current and backup modes as the first mode; after the mobile phone loses coverage, if there is an AT command to be issued, an ATI module acquires the backup mode and issues the AT command to NAS of the backup mode for processing; and when the mobile phone switches from the first mode to a second mode, after modifying the current and backup modes to the second mode, an general control module notifies the NAS of the first mode to perform a switching operation, when there is an AT command to be issued, the ATI module delivers the AT command to an NAS of the second mode for caching and processing after the switching.