Adaptive PRACH Configuration for Initial Access Latency
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Solution Overview
Problem
Current mobile communication systems face challenges in managing explosive data traffic, requiring higher transfer rates, increased connection devices, low latency, and high energy efficiency, particularly in initial access procedures due to limitations in random access channel configurations.
Innovation Solution
A method for performing initial access using adaptive selection and configuration of physical random access channel (PRACH) configurations, including preamble and data transmission, optimized for network conditions and coding rate, with the base station indicating PRACH configurations through downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional random access channel configurations are used for initial access, then the procedure is simple and standardized, but the latency is high and the transfer rate is limited
Solution Approach 1:
The patent applies dynamics by making the PRACH configuration adaptive rather than fixed. The base station dynamically selects from multiple PRACH configurations based on real-time network conditions and UE requirements, enabling flexible adjustment of preamble length, data transmission parameters, and timing to optimize initial access latency while managing configuration complexity through network-controlled adaptation.
Solution Approach 2:
The patent implements parameter changes by varying multiple PRACH configuration parameters including preamble length, data transmission timing, and resource allocation. This allows the system to adjust transmission parameters dynamically to reduce latency and improve transfer rates while the base station manages the complexity of multiple configurations through centralized control.
2Measurement precision
If the preamble length is increased to improve synchronization accuracy, then the coding rate improves, but the transmission time increases
Solution Approach 1:
The patent applies dynamics by making the preamble length adaptive rather than fixed. The base station dynamically adjusts the preamble length based on network conditions and synchronization requirements, allowing the system to extend preamble length when synchronization accuracy is critical while reducing it when transmission time should be minimized, thus resolving the contradiction between precision and time.
3Productivity
If multiple PRACH configurations are configured to optimize initial access, then the transfer rate and synchronization improve, but the configuration management complexity increases
Solution Approach 1:
The patent implements feedback by having the base station monitor network conditions and UE response, then use this feedback to dynamically select optimal PRACH configurations. This feedback mechanism allows the system to manage multiple configurations efficiently through intelligent selection rather than exhaustive management, improving initial access efficiency while controlling configuration management complexity through network-controlled adaptation.
Data Source
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AI summary
Disclosed are a method for performing an initial access in a wireless communication system, and an apparatus therefor. Specifically, a method by which a terminal performs an initial access comprises the steps of: receiving, from a base station, configuration information representing one or more physical random access channel (PRACH) configurations; receiving, from the base station, downlink control information including information indicating a specific PRACH configuration among the one or more PRACH configurations, through a physical downlink control channel; and transmitting a preamble and/or data, which are related to the initial access, to the base station through a PRACH on the basis of the specific PRACH configuration.