UE Random Access Procedure Selection via Threshold Comparison
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Solution Overview
Problem
Current random access procedures in 5G NR systems face inefficiencies due to the lack of precise control over the selection of RACH procedures, leading to suboptimal resource management and increased latency, particularly in scenarios requiring different types of random access procedures.
Innovation Solution
The implementation of a user equipment (UE) that receives multiple random access type threshold values, determines a random value, and selects a random access procedure type based on these thresholds, allowing for dynamic selection between 2-step and 4-step RACH procedures, thereby optimizing resource usage and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single random access procedure type is used for all scenarios, then the system is simple to implement, but resource management becomes suboptimal and latency increases
Solution Approach 1:
The patent implements dynamic selection between 2-step and 4-step RACH procedures based on real-time conditions. The UE determines a random value and compares it against configured thresholds to dynamically choose the appropriate RACH type, allowing the system to adapt to varying channel conditions, traffic types, and network states rather than using a fixed procedure type.
Solution Approach 2:
The patent changes the parameter of RACH procedure type selection from a static single-type approach to a multi-type approach controlled by random value thresholds. The network configures threshold values that determine the probability of selecting 2-step versus 4-step RACH, enabling flexible parameter adjustment to optimize performance for different scenarios.
2Loss of time
If 2-step RACH is used to reduce latency, then access speed improves, but collision probability increases under high load
Solution Approach 1:
The patent dynamically adjusts the probability of selecting 2-step RACH by comparing a random value against configurable thresholds. Under low load conditions, the threshold allows higher probability of 2-step selection for reduced latency. Under high load conditions, the threshold adjusts to reduce 2-step selection probability, thereby reducing collision risk while maintaining the capability for fast access when conditions permit.
3Reliability
If 4-step RACH is used to reduce collisions, then reliability improves, but access latency increases
Solution Approach 1:
The patent enables dynamic switching between 4-step and 2-step RACH procedures. When channel conditions are poor or load is high, the threshold comparison results in higher probability of 4-step selection, providing collision avoidance and reliable access. When conditions are favorable, the system switches to 2-step to minimize latency, thus dynamically balancing reliability and speed requirements.
4Adaptability or versatility
If multiple RACH procedure types are supported, then scenario-specific optimization is possible, but UE complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the UE autonomously determines the appropriate RACH procedure type by comparing its own random value against configured thresholds. This self决策 process eliminates the need for complex network control signaling for each RACH selection, reducing overall system complexity while maintaining high adaptability to different scenarios through UE-autonomous threshold-based selection.
Data Source
AI summary
The present disclosure relates to a user equipment (UE) that comprises a receiver, which receives a plurality of random access type threshold values. A processing circuitry of the UE determines a random value and then selects a type of a random access procedure to be performed by the UE. The selecting comprises at least selecting one out of the plurality of random access type threshold values, comparing the determined random value against the selected random access type threshold value, and selecting a type of the random access procedure based on the result of the comparison. The UE then performs the random access procedure of the selected type.