PRACH Occasion Selection for Power-Latency Tradeoffs
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Solution Overview
Problem
The activation of additional RACH occasions in wireless communication systems introduces complexity in selecting the most appropriate RACH occasion for RACH preamble transmission, leading to increased latency, inefficient power usage, and potential interference, as existing methods do not effectively balance transmission power and latency.
Innovation Solution
A method and apparatus for UEs to dynamically select between baseline and additional RACH occasions based on transmission power, timing, and historical transmission data, optimizing network performance and energy efficiency by considering differences in PRACH transmission power and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additional RACH occasions are activated to enhance network performance, then network capacity and energy efficiency are improved, but selection complexity and latency increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting RACH occasion selection based on measurable parameters including power headroom values, timing advance values, and path loss estimates. The UE compares these parameters against configured thresholds to determine which RACH occasion (baseline or additional) to use, transforming a complex multi-factor decision into a parameter-driven selection process that scales with network capacity requirements while maintaining manageable complexity
Solution Approach 2:
The patent implements dynamics by enabling the UE to adaptively switch between baseline and additional RACH occasions based on real-time channel conditions and power availability. The selection mechanism is not static but dynamically responds to changing network conditions, allowing the system to optimize performance under varying load conditions while managing selection complexity through structured decision criteria
2Productivity
If additional RACH occasions are activated to enhance network performance, then network capacity is improved, but transmission latency increases
Solution Approach 1:
The patent resolves the latency-capacity tradeoff by using parameter-based selection where the UE evaluates power headroom, timing advance, and path loss parameters to determine the optimal RACH occasion. This allows the system to activate additional RACH occasions for capacity enhancement while maintaining low latency for UEs in favorable conditions by selecting from multiple RACH occasions based on real-time parameter assessment rather than forcing all UEs to use additional occasions
3Loss of energy
If additional RACH occasions are activated to enhance energy efficiency, then network energy efficiency is improved, but power usage complexity increases
Solution Approach 1:
The patent addresses power usage complexity by introducing structured parameter comparisons including power headroom thresholds and path loss estimates. The UE follows defined decision logic that compares these parameters against configured thresholds, transforming complex power management into a systematic evaluation process. This enables energy efficiency optimization through additional RACH occasions while maintaining manageable power usage complexity through standardized parameter-based decision-making
Data Source
AI summary
Methods and apparatuses are provided for optimizing the selection of random access channel (RACH) occasions based on power and latency considerations, particularly under conditions where additional RACH occasions are activated to enhance network performance and energy efficiency. A user equipment (UE) receives a RACH configuration indicating a RACH occasion and information activating an additional RACH occasion. The UE selects one of the RACH occasion or the additional RACH occasion for a RACH preamble transmission, based on factors such as preamble transmission power, timing, historical transmission data, maximum number of transmissions, maximum transmission power, and specific RACH configurations or feature groups. The UE then transmits a RACH preamble in the selected occasion. Thus, the disclosed methods and apparatuses enable more efficient and reliable network access by dynamically balancing factors such as power usage and latency, leveraging historical transmission data, and adapting to varying network conditions.