PRACH Preamble Sequence Generation with Dynamic Cyclic Shift
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Solution Overview
Problem
Next-generation mobile communication systems face challenges in supporting explosive data traffic, increased per-user data rates, numerous connected devices, low end-to-end latency, and high-energy efficiency due to resource shortages and the need for advanced technologies like dual connectivity and non-orthogonal multiple access.
Innovation Solution
A method for generating and transmitting a physical random access channel (PRACH) preamble sequence with a zero correlation zone (ZCZ) based on a specific number-th root Zadoff-Chu sequence and cyclic shift, where the cyclic shift size is determined by subcarrier spacing and ZCZ configuration set, enabling efficient resource allocation and improved detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed cyclic shift size is used for PRACH preamble generation, then the system is simple to implement, but it cannot support various subcarrier spacings efficiently
Solution Approach 1:
The cyclic shift size NCS is made dynamic by determining it based on the subcarrier spacing configuration. Different subcarrier spacings (15 kHz, 30 kHz, 60 kHz, 120 kHz) correspond to different NCS values, allowing the system to adapt to various numerologies while maintaining proper zero correlation zone properties for PRACH detection
Solution Approach 2:
The invention changes the parameter NCS (cyclic shift size) according to the subcarrier spacing configuration. By linking NCS to the SCS configuration, the system can support multiple subcarrier spacings without requiring completely separate PRACH designs for each case
2Measurement precision
If the zero correlation zone length is increased to improve detection performance, then detection accuracy improves, but the processing complexity and resource requirements increase
Solution Approach 1:
The invention optimizes the zero correlation zone length by carefully selecting NCS values for different subcarrier spacings. This ensures sufficient detection performance while avoiding unnecessarily long ZCZ lengths that would increase processing complexity
Data Source
AI summary
Provided is a method for transmitting a physical random access channel (PRACH) preamble in a wireless communication system. More specifically, the method performed by the UE includes generating a PRACH preamble sequence having a zero correlation zone (ZCZ) having a specific length based on a specific number-th root Zadoff-Chu sequence and a cyclic shift; and transmitting to a base station the PRACH preamble including the generated PRACH preamble sequence.