PRACH Multi-Transmission Control for FR2 Uplink Coverage
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Solution Overview
Problem
In wireless communication systems, particularly in high frequency bands like FR2, insufficient uplink coverage during physical random access channel (PRACH) transmissions leads to communication quality issues, necessitating improved signal transmission methods to enhance coverage and reduce random access delays.
Innovation Solution
The terminal device determines whether a PRACH transmission is a first or multiple transmissions based on reference signal receiving power (RSRP), adjusting the number of transmissions and transmit power to improve uplink coverage and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PRACH transmission is used, then the transmission process is simple, but the uplink coverage is insufficient
Solution Approach 1:
The patent combines multiple PRACH transmissions (first PRACH transmission and second PRACH transmission) into a unified random access process. The terminal device performs both transmissions with different preamble sequences, and the network device combines the received signals, thereby improving uplink coverage while maintaining a coordinated transmission process.
2Reliability
If multiple PRACH transmissions are performed, then the random access success rate increases, but the transmission delay increases
Solution Approach 1:
The patent performs the second PRACH transmission immediately after the first transmission without waiting for a response, using pre-configured resources. This preliminary action allows the terminal device to send multiple transmissions in advance, increasing the success rate while minimizing additional delay.
Solution Approach 2:
The patent implements periodic PRACH transmissions with a predetermined period, where the terminal device sends the second transmission at a specific time interval after the first transmission. This periodic structure optimizes the balance between success rate improvement and delay minimization.
3Reliability
If multiple PRACH transmissions are used, then the uplink coverage is enhanced, but the signal processing complexity increases
Solution Approach 1:
The patent applies different processing complexities to different transmissions: the first PRACH transmission uses standard processing, while the second transmission uses simplified processing based on pre-configured parameters. This local quality differentiation reduces overall signal processing complexity while maintaining coverage enhancement benefits.
Data Source
AI summary
This application provides a signal transmission method and apparatus. The method includes: determining, by the terminal device, whether a to-be-performed PRACH transmission is a first PRACH transmission; determining, by the terminal device, in a case that the to-be-performed PRACH transmission is not the first PRACH transmission, whether the to-be-performed PRACH transmission is first multiple PRACH transmissions; and initiating, by the terminal device, in a case that the to-be-performed PRACH transmission is the first multiple PRACH transmissions, multiple PRACH transmissions to a network device based on a quantity of transmissions of the to-be-performed PRACH transmission and a transmit power of the to-be-performed PRACH transmission, where the quantity of transmissions of the to-be-performed PRACH transmission and the transmit power of the to-be-performed PRACH transmission are determined by the terminal device based on a reference signal receiving power RSRP.