Terminal RACH Switching by Power Thresholds to Limit Collisions
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Solution Overview
Problem
The efficiency of random access processing in 2-step Random Access Channel (RACH) procedures in 5G NR systems is compromised due to inadequate transmit power control and resource utilization, leading to potential collisions and degraded transmission quality of the PUSCH signal.
Innovation Solution
A method for the terminal to dynamically select between 2-step and 4-step RACH procedures based on transmit power control, where the terminal transmits both a PRACH preamble and a PUSCH only when both power values meet predetermined thresholds, otherwise falling back to the 4-step procedure to avoid collisions and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal transmits both PRACH preamble and PUSCH in 2-step RACH procedure, then the random access processing speed is improved, but the transmission quality deteriorates when power values do not meet thresholds
Solution Approach 1:
The terminal dynamically adjusts the random access procedure selection based on real-time power conditions. When both power values meet thresholds, the terminal uses 2-step RACH for fast access; when either power value fails to meet thresholds, the terminal falls back to 4-step RACH for reliable transmission. This dynamic adaptation resolves the contradiction between speed and reliability.
Solution Approach 2:
The terminal changes the procedural parameter (2-step vs 4-step RACH) based on power threshold conditions. By monitoring power values and comparing them against thresholds, the terminal selects the appropriate RACH procedure to maintain transmission quality while optimizing access speed.
2Productivity
If the terminal uses 2-step RACH procedure without power control, then the access efficiency is improved, but collisions increase and transmission quality degrades
Solution Approach 1:
The terminal implements feedback-based power control by monitoring its own power values and comparing them against thresholds. This feedback mechanism enables the terminal to adjust its transmission strategy (2-step vs 4-step RACH) to avoid collisions and maintain transmission quality while preserving access efficiency.
Solution Approach 2:
The system dynamically switches between 2-step and 4-step RACH procedures based on real-time power conditions. This dynamic behavior allows the terminal to maintain high access efficiency when conditions are favorable while avoiding collisions when power levels are insufficient.
3Reliability
If the terminal falls back to 4-step RACH procedure, then the transmission reliability is improved, but the processing time increases
Solution Approach 1:
The terminal dynamically selects the RACH procedure based on power threshold conditions. By using 2-step RACH when power conditions are met and 4-step RACH when they are not, the terminal minimizes unnecessary time loss while ensuring transmission reliability is maintained through appropriate procedure selection.
Solution Approach 2:
The terminal changes the procedural parameter (RACH type) based on power conditions. This parameter change allows the system to optimize the trade-off between reliability and processing time by selecting the appropriate procedure for current conditions.
Data Source
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AI summary
Provided is a terminal that makes it possible to improve the efficiency of random access processing. A control unit (209) in the terminal (200) uses channel quality as a basis to select either a first method for transmitting a random access signal including a preamble section and a data section or a second method for transmitting a random access signal that includes a preamble section and that does not include a data section. A transmission unit (217) transmits a random access signal on the basis of the selected method.