Random Access Channel Configuration for Propagation Delay Compensation
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Solution Overview
Problem
Current random access procedures in 5G New Radio (NR) systems do not adequately account for propagation delays between terminals and base stations, particularly in non-terrestrial networks, leading to inefficiencies and increased collision probabilities due to varying propagation times across different terminals.
Innovation Solution
The implementation of a transmission and reception apparatus/method that adjusts random access channel configurations based on positional information, using different PRACH resource configurations (Type1 and Type2) to synchronize transmission timings and reduce delay differences between terminals, thereby improving access efficiency and reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unified random access channel configuration is used for all terminals, then device complexity is reduced and ease of operation is improved, but propagation delay differences between terminals cause increased collision probability and reduced reliability
Solution Approach 1:
The random access channel configuration is segmented into multiple types (first type and second type) based on terminal position information. Terminals are divided into different groups according to their propagation delay characteristics, with each group using a dedicated configuration type. This segmentation allows the system to address propagation delay differences while maintaining clear configuration management through position-based classification.
Solution Approach 2:
The configuration type selected by each terminal is dynamically determined based on its position information and propagation delay to the base station. Terminals can adaptively choose between first-type and second-type configurations according to their specific propagation delay characteristics, enabling dynamic optimization of random access timing without requiring complex centralized configuration management for each terminal.
2Reliability
If random access configuration is adjusted based on positional information, then propagation delay differences are compensated and collision probability is reduced, but measurement precision requirements increase and device complexity increases
Solution Approach 1:
Different configuration parameters are applied locally to terminals based on their specific position information and propagation delay characteristics. Instead of requiring high-precision absolute position data for all terminals, the system applies localized configuration adjustments (first-type or second-type) tailored to each terminal's propagation delay environment, reducing the overall measurement precision burden while maintaining random access reliability.
Solution Approach 2:
The system changes key configuration parameters (such as timing advance values, random access occasion assignments, or preamble formats) based on terminal position information. By adjusting these parameters according to propagation delay characteristics, the system compensates for timing differences without requiring extremely precise position measurements, as the parameter changes are calibrated to match typical propagation delay ranges for different terminal locations.
3Adaptability or versatility
If multiple PRACH resource configurations are implemented, then adaptability to different propagation delays is improved, but device complexity and configuration management difficulty increase
Solution Approach 1:
Multiple PRACH resource configurations (first-type and second-type) are pre-defined and stored in the base station and terminals before random access occurs. These configurations are prepared in advance with different timing and resource parameters to accommodate various propagation delay scenarios. When a terminal needs to access the network, it selects from these pre-configured options based on its position information, avoiding the need for complex real-time configuration generation and simplifying management.
Data Source
AI summary
The purpose of the invention is to realize appropriate random-access procedures in accordance with propagation delay between a terminal and a base station. A terminal (100) comprises a wireless transmission unit (104) that transmits random-access channel signals, and a control unit (108) that controls settings related to the transmission of signals in the random-access channel on the basis of availability of position information indicating the position of a communication partner of the terminal 100 and the position of the terminal 100.