Terminal Precoding Selection for 5G Random Access Reliability
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Solution Overview
Problem
Current communication systems, particularly in the context of 5G cellular networks, face challenges in efficiently managing interference between cells and terminal apparatuses, especially in high-frequency cells with high attenuation, where existing methods struggle to maintain reliable communication across the entire cell using beam forming and sequential signal transmission.
Innovation Solution
A terminal apparatus and communication method that selectively uses different precoding and random access preambles to communicate with a base station, incrementing counters to retry transmissions if initial attempts are unsuccessful, allowing for adaptive beam management and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam forming and sequential signal transmission are used to cover the entire cell in high-frequency cells, then coverage area is improved, but interference between cells and terminal apparatuses increases
Solution Approach 1:
The terminal apparatus dynamically selects precoding from multiple available precoding options based on channel conditions and interference levels. This dynamic adaptation allows the system to optimize beam directions and reduce interference while maintaining coverage, resolving the contradiction between expanding coverage area and reducing interference in high-frequency cells
Solution Approach 2:
The system changes precoding parameters and random access preamble selection based on counter values and reception success. By adjusting these parameters dynamically, the system can reduce interference between cells and terminal apparatuses while maintaining effective coverage area in high-frequency environments
2Reliability
If multiple precoding are used for random access preamble transmission, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The terminal apparatus segments the random access process by dividing it into multiple transmission attempts with different precoding options. Each attempt uses a specific precoding from the available set, and the system tracks success/failure with counters. This segmentation approach improves reliability through diversity while managing complexity by organizing the process into discrete, manageable steps
Solution Approach 2:
The system implements feedback mechanisms where the terminal monitors random access response reception and adjusts precoding selection based on counter values. This feedback loop enables reliable communication by learning from previous transmission outcomes while maintaining manageable device complexity through systematic decision-making based on simple counter thresholds
Data Source
AI summary
There is provided a terminal apparatus to transmit a first random access preamble using a first precoding, monitor a random access response corresponding to the first random access preamble, increment a value of a counter in a case that a reception of the random access response is not successful, and transmit a second random access preamble using a second precoding, if the value of the counter does not reach a predetermined value in a case that the value of the counter is incremented.