PRACH Timing Offset and Power Ramping for Accurate Random Access
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN) and other wireless communication scenarios, User Equipment (UE) faces challenges in accurately determining Timing Advance (TA) for uplink signal transmission, leading to unsuccessful PRACH attempts and inefficient power ramping due to inaccurate self-adjusted TA, which can cause interference and increased power consumption.
Innovation Solution
A method for wireless communications involving separate counting and power ramping strategies for random access with and without timing offset pre-compensation, optimizing PRACH configuration and power selection based on timing offset equality or inequality, ensuring accurate counting and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE uses self-adjusted TA for PRACH transmission, then timing alignment is improved, but power consumption increases due to unsuccessful attempts and unnecessary power ramping
Solution Approach 1:
The patent implements feedback mechanisms where the network provides TA validation information to the UE. The UE receives feedback indicating whether its self-adjusted TA is accurate, and adjusts its behavior accordingly - using self-adjusted TA only when validated, otherwise falling back to traditional TA methods. This feedback loop prevents unnecessary power ramping while maintaining timing alignment accuracy where applicable.
Solution Approach 2:
The patent introduces dynamic switching between different TA determination modes based on validation status. The UE dynamically adjusts its TA strategy - transitioning between self-adjusted TA mode (when validated) and traditional TA mode (when not validated or unavailable). This dynamic adaptation optimizes power consumption by avoiding unsuccessful transmissions while maintaining timing alignment performance.
2Measurement precision
If UE implements separate counting for PRACH with and without timing offset pre-compensation, then counting accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the random access procedure into distinct categories based on timing offset pre-compensation usage. Separate counters are maintained for PRACH attempts with timing offset pre-compensation and those without. This segmentation enables accurate tracking and reporting of each type independently, improving measurement precision while organizing the complexity into manageable, distinct tracking mechanisms.
Data Source
AI summary
The present disclosure provides a method and device in nodes used for wireless communications. A first node transmits a first signal and a second signal, and the first signal and the second signal are both used for initiating a random access; and a target counter is used for counting of a random access; a count value of the target counter when transmitting the first signal is a first count value, and a count value of the target counter when transmitting the second signal is a second count value; a first timing offset value is used to determine a timing for transmitting the first signal. The application establishes a connection between a timing offset value and a number of transmission times of a random access channel to optimize the transmission scheme of the random access channel, thus improving the system performance.