PRACH Resource Selection for High-Mobility NR Random Access
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Solution Overview
Problem
Existing LTE and NR technologies face challenges in determining optimal random access resources and PRACH transmissions, particularly for terminals moving at medium and high speeds, as they do not adequately account for beam associations and signal measurements.
Innovation Solution
A method and apparatus for determining random access resources in NR that considers the quantity of PRACH transmissions and reference signals based on signal measurements and network indications, allowing for flexible adjustment during the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LTE random access resource determination is used, then the procedure is simple, but it is not suitable for terminals moving at medium and high speeds
Solution Approach 1:
The patent applies local quality by associating random access resources with specific reference signals (SSB or CSI-RS) and determining PRACH transmission quantities based on local signal measurement conditions. Different terminals can select different reference signals and corresponding resources based on their specific channel conditions and movement states, rather than using a unified LTE approach for all terminals.
Solution Approach 2:
The patent implements dynamics by allowing the quantity of PRACH transmissions to be determined dynamically based on signal measurement values and thresholds. The terminal can adjust the number of repetitions according to current channel conditions, making the random access procedure adaptable to changing movement conditions rather than using a fixed LTE approach.
2Productivity
If the quantity of PRACH transmissions is determined before the first random access attempt, then the procedure is efficient, but it cannot be adjusted for subsequent attempts
Solution Approach 1:
The patent applies preliminary action by determining the quantity of PRACH transmissions before the first random access attempt based on initial signal measurements. This preliminary determination allows the terminal to start the random access procedure efficiently with an appropriate transmission quantity already established, avoiding delays during the procedure itself.
Solution Approach 2:
The patent implements dynamics by allowing re-determination of the quantity of PRACH transmissions during subsequent random access attempts. When the quantity of attempts reaches a configured value, the terminal can re-evaluate signal conditions and adjust the transmission quantity, providing flexibility while maintaining initial efficiency.
3Reliability
If multiple PRACH transmissions are supported in NR, then coverage is improved, but resource determination becomes complex
Solution Approach 1:
The patent applies local quality by associating different random access resources with different reference signals (SSB or CSI-RS) and their respective measurement conditions. Each reference signal has associated resources and transmission parameters tailored to its specific channel characteristics, allowing coverage enhancement through multiple transmissions while maintaining organized, manageable resource determination based on local signal conditions.
Data Source
AI summary
Embodiments of the present application provide a random access resource determining method, a terminal, an apparatus, and a storage medium. The method comprises: determining a PRACH transmission frequency in the current random access attempt and a reference signal, determining a random access resource of the current random access attempt on the basis of the PRACH transmission frequency in the current random access attempt and the reference signal, and sending a PRACH of the current random access attempt on the random access resource.