Radio Node Branch Synchronization Control for TDD Misalignment
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Solution Overview
Problem
In Time Division Duplex (TDD) cellular networks, misalignment errors between parallel transmit branches can cause communication disturbances and equipment damage due to improper switching between transmit and receive modes, which existing calibration methods may fail to detect promptly.
Innovation Solution
A method and radio node with a control unit that monitors indication signals from branches to ensure synchronized mode changes, disabling faulty branches and reporting them to a supervision center to prevent misalignment and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple parallel transmit branches are used to improve data rate and signal quality, then productivity and reliability are improved, but misalignment errors between branches can cause harmful interference and equipment damage
Solution Approach 1:
The patent implements a feedback mechanism where the control unit monitors indication signals from each branch to detect when mode switching is complete. This feedback loop ensures that mode changes are synchronized across all branches, preventing misalignment errors that would cause harmful interference and equipment damage while maintaining the productivity benefits of multiple parallel branches.
Solution Approach 2:
The control unit acts as an intermediary between the multiple parallel transmit branches, coordinating their mode switching operations. By receiving indication signals from each branch and controlling the timing of mode changes, the control unit mediates the potential conflicts between branches, ensuring they operate in synchronization without causing harmful interference.
2Manufacturing precision
If calibration is performed to align parallel branches, then misalignment errors are reduced, but existing calibration methods fail to detect faulty branches promptly
Solution Approach 1:
The control unit continuously receives indication signals from each branch during operation, providing real-time feedback on the status of mode switching. This ongoing monitoring enables the system to detect when a branch fails to switch modes properly, promptly identifying faulty branches that would otherwise go undetected by traditional calibration methods.
Solution Approach 2:
The system performs preliminary checks by monitoring indication signals before faulty branches can cause significant harm. By detecting mode switching failures early through continuous monitoring, the system can take corrective action before misalignment errors accumulate or cause equipment damage.
3Reliability
If mode switching is performed according to TDD scheme, then uplink and downlink transmissions are separated, but synchronized mode changes between all branches are difficult to achieve
Solution Approach 1:
The patent merges the control of multiple parallel branches under a single control unit that receives and processes indication signals from all branches. This unified control approach simplifies the synchronization task by coordinating all branches through a central point, ensuring they switch modes together according to the TDD scheme without requiring complex distributed synchronization protocols.
Solution Approach 2:
The control unit serves as an intermediary that receives indication signals from each branch and coordinates the timing of mode changes across all branches. This mediation simplifies the synchronization complexity by providing a central coordination point that ensures all branches transition modes simultaneously according to TDD requirements.
Data Source
AI summary
Method and radio node (500) for controlling a change of communication mode between transmit mode and receive mode according to a Time Division Duplex, TDD, scheme. The radio node has at least two parallel branches (504, 06) for transmission and reception of radio signals, wherein the branches currently operate in a first communication mode. The radio node obtains one or more indication signals (S1A, S1B) generated by one or more of the branches to indicate that the first mode has been turned off. When it is determined that the first communication mode has not been turned off in a faulty branch, e.g. by not receiving an indication signal in time from that branch, the first mode is disabled in the faulty branch, and/or the faulty branch is reported to a supervision center (510). Thereby, it can be discovered when one of the branches is misaligned or otherwise faulty and suitable actions can be taken for repairing or replacing the faulty branch.