PRACH Repetition Mapping Using One Spatial Filter for Coverage
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently mapping random access channel preambles across multiple occasions using the same spatial filter, leading to suboptimal coverage and resource utilization.
Innovation Solution
The described techniques involve transmitting random access channel preambles across multiple random access occasions using the same spatial filter, following specific mapping rules based on frequency, time, and association period indices, ensuring efficient resource utilization and increased detection likelihood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access preambles are transmitted across multiple random access occasions using the same spatial filter, then coverage is enhanced and detection likelihood is improved, but resource mapping complexity increases
Solution Approach 1:
The patent changes the parameter of spatial filter consistency by transmitting multiple random access preambles using the same spatial filter across different random access occasions. This parameter change enhances detection likelihood while the patent manages the associated complexity through defined mapping rules based on frequency, time, and association period indices.
2Reliability
If multiple random access occasions are used for preamble repetitions, then coverage is enhanced, but latency increases
Solution Approach 1:
The patent applies preliminary action by transmitting multiple random access preambles in advance across different random access occasions using the same spatial filter. This allows the system to proactively enhance coverage before attempting data transmission, thereby reducing the likelihood of retransmissions and overall latency.
3Productivity
If random access preambles are mapped according to multiple mapping rules (frequency, time, association period indices), then resource utilization is optimized, but device complexity increases
Solution Approach 1:
The patent utilizes multiple parameters (frequency index, time index, association period index) to define mapping rules for random access preambles. By changing and combining these parameters, the patent achieves optimized resource utilization while managing complexity through systematic parameter-based mapping.
Data Source
AI summary
The described techniques enable repeated physical random access channel (PRACH) preamble transmissions across multiple random access occasions (ROs) using a same spatial filter. A user equipment (UE) may transmit a PRACH preamble across multiple ROs, where each RO is associated with a same synchronization signal block (SSB) or channel state information reference signal (CSI-RS). The PRACH repetitions may be transmitted in ROs in accordance with a first mapping rule: first, in increasing order of frequency resource index; second, in increasing order of a time resource index; third, in increasing order of PRACH slot indices; and fourth, in increasing order of PRACH association period indices. Additionally, or alternatively, the PRACH repetitions may be transmitted in ROs in accordance with a second mapping rule: first, in increasing order of time resource index; second, in increasing order of PRACH slot indices; and third, in increasing order of PRACH association period indices.