Advanced Antenna Calibration Scheduling for Delay-Sensitive Traffic
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Solution Overview
Problem
Antenna calibration in advanced antenna systems (AAS) often collides with delay-sensitive traffic, leading to potential performance degradation and legal issues, especially in high traffic scenarios, due to unpredictable latency and resource conflicts between distributed units (DUs) and remote units (RUs).
Innovation Solution
Implement a method for antenna calibration scheduling that includes determining latency from the DU to the AAS, allowing for real-time adjustments using in-band signaling to drop or keep AC measurements based on conflict detection with critical traffic, ensuring robust AC performance and protection of delay-sensitive channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna calibration is performed in advanced antenna systems, then calibration accuracy and beamforming performance are improved, but conflicts with delay-sensitive traffic occur leading to performance degradation
Solution Approach 1:
The system performs preliminary actions by scheduling antenna calibration measurements in advance during designated time windows, allowing the network to prepare for potential conflicts with delay-sensitive traffic before the calibration actually occurs. The scheduler proactively identifies and reserves calibration time slots, preventing collisions with critical traffic.
Solution Approach 2:
The calibration scheduling system dynamically adjusts calibration timing and resources based on real-time traffic conditions. The in-band signaling mechanism allows the system to flexibly modify calibration parameters and reschedule measurements when traffic patterns change, ensuring calibration accuracy while adapting to varying network demands.
2Reliability
If antenna calibration measurements are scheduled in advance, then calibration reliability is improved, but latency between scheduling and execution increases
Solution Approach 1:
The system implements periodic calibration scheduling where calibration time windows are repeated at regular intervals. This allows the network to maintain a balance between advance scheduling for reliability and periodic opportunities for calibration execution. The periodic nature enables predictable timing that reduces latency while ensuring calibration occurs at appropriate intervals.
Solution Approach 2:
The system changes scheduling parameters such as calibration time window duration, frequency, and resource allocation to optimize the balance between reliability and latency. By adjusting these parameters dynamically, the system can reduce the time between scheduling and execution when traffic conditions permit, while maintaining advance scheduling benefits when needed.
3Adaptability or versatility
If in-band signaling is used for real-time AC adjustment, then adaptability to traffic conditions is improved, but signaling complexity increases
Solution Approach 1:
The in-band signaling mechanism serves multiple functions: it conveys calibration scheduling information, indicates traffic condition status, and enables real-time adjustment decisions. By making the signaling system multi-functional, the patent reduces the need for separate dedicated calibration control channels, thereby limiting the increase in overall system complexity while maintaining high adaptability.
Data Source
AI summary
According to one or more embodiments, a network node is provided. The network node is configured to: indicate time and frequency domain resources for a first antenna calibration, AC, window; after the indication and before the first AC window, determine whether to perform an AC measurement in the first AC window using the indicated time and frequency domain resources; and indicate the determination, using in-band signaling, whether to perform the AC measurement in the first AC window.