PRACH Signal Reach Extension via Spatial Layer Allocation
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Solution Overview
Problem
The existing wireless communication systems face limitations in extending the reach area of random access preamble and uplink data signals due to signal attenuation, limited transmission power, and interference from RF impairments, particularly in 5G NR scenarios with dense small cell deployments, leading to reduced coverage and reliability.
Innovation Solution
The method involves generating and transmitting PRACH signals in the frequency domain, allocating frequency resource blocks to spatial layers, and applying spectrum shaping filters to reduce PAPR in PUSCH signals, thereby enhancing signal reach without adding time or frequency resources and maintaining compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If temporal retransmission is performed to extend coverage, then coverage area is improved, but power consumption increases and resource efficiency decreases
Solution Approach 1:
The patent transitions from temporal domain (retransmission over time) to spatial domain (simultaneous transmission across multiple frequency resources) to extend coverage. By allocating different portions of the PRACH sequence to different spatial layers and frequency resource blocks, the system achieves coverage extension without requiring multiple time slots, thereby avoiding increased power consumption and maintaining resource efficiency.
2Measurement precision
If spatial coding techniques are applied to improve detection accuracy, then detection probability is improved, but device complexity increases and detection reliability decreases
Solution Approach 1:
The patent segments the PRACH sequence into multiple portions and maps each portion to different spatial layers and frequency resource blocks. This segmentation approach simplifies detection by allowing the base station to identify the transmitting UE through pattern recognition of sequence portions across spatial dimensions, avoiding the complexity of traditional spatial coding techniques while maintaining detection accuracy.
3Area of stationary object
If PRACH transmission is performed multiple times to extend coverage, then coverage area is improved, but resource efficiency decreases and base station determination complexity increases
Solution Approach 1:
Instead of repeating PRACH transmissions in the time domain, the patent utilizes the frequency domain by allocating different frequency resource blocks to different spatial layers. This allows coverage extension through frequency diversity while maintaining time efficiency, as all transmissions occur simultaneously rather than sequentially, thereby preserving resource efficiency and simplifying base station determination processes.
Data Source
AI summary
Proposed is an apparatus and method for increasing the reach area of a random access preamble and uplink data signals in a wireless communication system. An operation method of a transmitter in a wireless communication system may include a process of generating sequences for generating a physical random preamble channel (PRACH) signal, a process of converting the sequences in a frequency domain, a process of dividing the converted sequences into frequency source blocks (RB), a process of allocating the frequency resource blocks to different spatial layers, and a process of transmitting the PRACH signal on the basis of the frequency resource blocks allocated to the spatial layers.