5G NR RACH Failure Thresholds for FR1/FR2 Handover Stability
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Solution Overview
Problem
Current 5G NR systems experience excessive handover and secondary cell group failures due to repeated preamble PRACH transmission failures between FR1 and FR2, leading to increased power consumption, resource underutilization, and signaling overhead.
Innovation Solution
Implement enhanced RACH procedures in user equipment (UE) and base stations to avoid FR1/FR2 ping ponging by adjusting transmit beams, initial preamble power, and reducing the number of PRACH attempts, and suspending measurement object configurations when failure thresholds are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated preamble PRACH transmission attempts are performed between FR1 and FR2, then connection reliability is improved, but power consumption increases and resource utilization decreases
Solution Approach 1:
The system performs preliminary detection of RACH failure thresholds and identifies ping-pong conditions before excessive retransmissions occur. By detecting the failure pattern early and suspending measurement object configurations when thresholds are met, the system prevents unnecessary repeated transmissions that would consume additional power, while still maintaining connection reliability through controlled remedial actions.
Solution Approach 2:
The invention extracts and removes the problematic repeated transmission cycle by suspending measurement object configurations when RACH failure thresholds are met. This extraction eliminates the harmful ping-pong effect between FR1 and FR2, stopping the excessive power-consuming retransmissions while preserving the essential connection functionality through selective suspension rather than complete termination.
2Reliability
If repeated preamble PRACH transmission attempts are performed between FR1 and FR2, then connection reliability is improved, but resource utilization decreases
Solution Approach 1:
The system performs preliminary detection of RACH failure thresholds and identifies ping-pong conditions before excessive retransmissions occur. By detecting the failure pattern early and suspending measurement object configurations when thresholds are met, the system prevents unnecessary repeated transmissions that would waste network resources, while still maintaining connection reliability through controlled remedial actions.
Solution Approach 2:
The invention extracts and removes the problematic repeated transmission cycle by suspending measurement object configurations when RACH failure thresholds are met. This extraction eliminates the harmful ping-pong effect between FR1 and FR2, stopping the excessive resource-consuming retransmissions while preserving the essential connection functionality through selective suspension rather than complete termination.
3Reliability
If repeated preamble PRACH transmission attempts are performed between FR1 and FR2, then connection reliability is improved, but signaling overhead increases
Solution Approach 1:
The system performs preliminary detection of RACH failure thresholds and identifies ping-pong conditions before excessive retransmissions occur. By detecting the failure pattern early and suspending measurement object configurations when thresholds are met, the system prevents unnecessary repeated transmissions that would generate excessive signaling overhead, while still maintaining connection reliability through controlled remedial actions.
Solution Approach 2:
The invention extracts and removes the problematic repeated transmission cycle by suspending measurement object configurations when RACH failure thresholds are met. This extraction eliminates the harmful ping-pong effect between FR1 and FR2, stopping the excessive signaling overhead generated by repeated failures while preserving the essential connection functionality through selective suspension rather than complete termination.
4Measurement precision
If multi-dimensional RACH failure threshold is implemented, then RACH failure detection accuracy is improved, but device complexity increases
Solution Approach 1:
The RACH failure threshold is segmented into multiple independent dimensions (time window, frequency range, mobility state) that can be evaluated separately. This segmentation allows the system to achieve multi-dimensional detection accuracy while maintaining manageable complexity by processing each dimension independently rather than as a monolithic complex evaluation.
Solution Approach 2:
The invention adds multiple dimensions to the RACH failure threshold evaluation (time window, frequency range, mobility state) to improve detection accuracy. By structuring the threshold as a multi-dimensional framework rather than a single value, the system achieves more precise failure detection while organizing the complexity into structured, manageable dimensions that can be evaluated systematically.
Data Source
AI summary
Apparatuses, systems, and methods for RACH procedures to avoid excessive handover/secondary cell group failures. A base station may declare a handover and/or secondary cell group (SCG) failure and may determine that a failure threshold has been met. The base station may perform a remedial action in response to meeting the failure threshold. The failure threshold may be multi-dimensional, where a first dimension is associated with a number of handover/SCG failures and where a second dimension is associated with a time period in which the number of handover/SCG failures occurred. Further, a third dimension may be associated with a UE mobility state and a fourth dimension may be associated with whether the UE is using FR1 or FR2. The remedial action in response to meeting the failure threshold may include the base station suspending transmission of measurement object configurations for a specified period of time.