Random Access Preamble Transmission via Consecutive Beams
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Solution Overview
Problem
In 5G network communication, user equipment (UE) in overlapping coverage areas of multiple beams faces challenges in reliably sending random access preambles due to the periodic nature of high-frequency beam sweeping, leading to interference and reduced communication quality.
Innovation Solution
The UE sends random access preambles through at least two consecutive beams, allowing the base station to identify which beam has good channel performance based on signal-to-noise ratio, and instructs the UE to select the optimal beam for communication, thereby enhancing reliability and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE sends random access preamble through a single beam in overlapping coverage area, then the access process is simple, but the reliability of random access deteriorates due to beam interference and poor channel performance
Solution Approach 1:
The patent divides the random access process into multiple beam attempts. Instead of using a single beam, the UE segments the access attempt across multiple beams (first beam and second beam) in the overlapping coverage area. This segmentation allows the system to test different beam paths and select the one with better channel performance, thereby improving reliability while maintaining manageable complexity through structured processing.
Solution Approach 2:
The patent changes the parameter of beam selection by comparing channel quality indicators (CQI) or reference signal received power (RSRP) of different beams. The system dynamically adjusts which beam is selected for random access based on measured parameters, transitioning from a static single-beam approach to a dynamic multi-beam comparison approach that adapts to channel conditions.
2Measurement precision
If the base station receives preambles through multiple beams, then the channel performance identification becomes more accurate, but the processing complexity increases
Solution Approach 1:
The patent extracts only the necessary information from multiple received preambles - specifically, the channel quality metrics (CQI or RSRP) associated with each beam. Instead of processing all aspects of multiple preambles, the base station extracts and compares only the relevant channel performance parameters, thereby achieving accurate beam identification without excessive processing complexity.
Solution Approach 2:
The patent performs preliminary beam quality measurement and comparison at the base station before making the final beam selection decision. By pre-processing the channel quality indicators from multiple beams and identifying the best beam in advance, the system reduces the complexity of subsequent access processing while maintaining high measurement precision.
3Loss of time
If the UE selects a target access beam without comparison in overlapping coverage, then the access procedure is fast, but the communication quality deteriorates
Solution Approach 1:
The patent implements a partial comparison approach where the UE measures channel quality of multiple beams but only performs the minimum necessary comparisons to identify a suitable target beam. Rather than exhaustively analyzing all possible parameters of all beams, the system performs sufficient but not excessive measurement and comparison, achieving an optimal balance between access time and communication quality.
Data Source
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AI summary
Provided in the present disclosure are a method, user equipment, and a base station for controlling random access to a network. The method comprises: sending to a base station, by means of at least two consecutive beams, random access preambles, wherein the preambles carried by two adjacent beams belong to different preamble packets; receiving a random access response message sent by the base station in response to the preambles; and accessing a network according to the random access response message. Employing the method of controlling the random access to a network provided in the present disclosure improves a success rate and reliability of random access to a network for user equipment units in a 5G network.