PUSCH DMRS Parameter Alignment for Reliable Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the 5G NR system, terminals face challenges in uplink data transmission due to network devices failing to detect the DMRS sequence of the PUSCH, causing unsuccessful random access, especially when the terminal sends a preamble in an asynchronous state, leading to interference and unsuccessful detection of uplink data packets.
Innovation Solution
The terminal obtains a DMRS sequence generation parameter for the PUSCH and sends a random access message accordingly, aligning with the network device's demodulation parameters to ensure successful detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal sends a random access message on PUSCH without DMRS sequence information, then the terminal can initiate random access in asynchronous state, but the network device cannot successfully detect the message, causing uplink transmission to fail
Solution Approach 1:
The network device pre-configures and provides DMRS sequence generation parameters to the terminal before the terminal sends the random access message. This preliminary provision of parameters ensures that when the terminal transmits the message on PUSCH, the network device already has the necessary DMRS information to successfully detect and demodulate the message, resolving the detection failure issue while maintaining asynchronous random access capability
2Reliability
If the network device performs blind detection to find DMRS sequences, then the device can potentially detect messages from terminals, but the detection complexity increases significantly
Solution Approach 1:
DMRS sequence generation parameters act as an intermediary element between the terminal and network device. The network device provides these parameters to the terminal, which then uses them to generate DMRS sequences for message transmission. This intermediary mechanism eliminates the need for blind detection by ensuring both sides use the same predetermined parameters, significantly reducing detection complexity while maintaining reliable message detection
Data Source
AI summary
A random access transmission method and a terminal are provided. The method includes: obtaining a demodulation reference signal (DMRS) sequence generation parameter of a physical uplink shared channel (PUSCH); and sending a random access message according to the DMRS sequence generation parameter; where the random access message corresponds to the PUSCH and a PRACH.