Terminal Device Random Access Repetition Level Control
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Solution Overview
Problem
There is a mismatch in the number of repetitions for random access procedures between terminal devices and base station devices, leading to potential failures in transmission and reception, as the devices may not correctly manage repetition control.
Innovation Solution
The system configures terminal devices to receive random access common configuration information including the number of repetitions for each level from the base station, allowing the MAC layer to adjust the level based on transmission attempts, ensuring efficient repetitive transmission and reception control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station device and terminal device use fixed repetition control for random access procedures, then the implementation is simple, but transmission failures occur due to mismatch in the number of repetitions between devices
Solution Approach 1:
The patent applies dynamics by making the repetition level configurable and adjustable rather than fixed. The base station can dynamically set different repetition levels (first level with first number of repetitions, second level with second number of repetitions) based on terminal characteristics and channel conditions, allowing the system to adapt to varying transmission requirements while maintaining manageable complexity through structured level definitions
Solution Approach 2:
The patent changes the parameter of repetition count from a fixed value to a configurable parameter with multiple levels. By defining different repetition levels with different numbers of repetitions and allowing the base station to configure which level the terminal should use, the system can adjust the transmission reliability parameter without requiring complex ad-hoc negotiation protocols
2Measurement precision
If the base station device notifies the terminal device of the number of repetitions, then transmission control accuracy improves, but information overhead increases
Solution Approach 1:
The patent segments the repetition control information into discrete, predefined levels rather than transmitting arbitrary values. By organizing repetition counts into structured levels (first level, second level, etc.) with specific associated repetition numbers, the system achieves precise control while minimizing information overhead through compact level identification rather than full parameter transmission
3Reliability
If the terminal device repeatedly transmits random access preambles, then coverage enhancement is achieved, but transmission time increases
Solution Approach 1:
The patent applies dynamics by enabling adaptive repetition level selection based on actual channel conditions and terminal characteristics. The base station can configure terminals to use higher repetition levels when coverage enhancement is needed and lower levels when conditions are good, allowing the system to optimize the balance between coverage enhancement and access time rather than using fixed repetitive transmission for all cases
Data Source
AI summary
Disclosed is a radio communication system in which a base station device and a terminal device communicate with each other, and the terminal device performs a random access procedure. The base station device notifies the terminal device of random access common configuration information including the number of repetitions for each level, information indicating a relationship between group information of random access preambles and the level, and the number of attempts of preamble transmission for each level. A MAC layer in the terminal device performs processing of increasing the level in a case that a first counter exceeds the number of attempts of transmission corresponding to the level.