Wireless Random Access Timing for 2-Step and 4-Step RACH
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Solution Overview
Problem
Future wireless communication systems face challenges in meeting the diverse performance requirements of different application scenarios, particularly in adapting to the varying demands of 2-Step RACH and 4-Step RACH procedures, including time delays, collision probabilities, and capacity needs.
Innovation Solution
A method and device that allow for flexible control over random access fallbacks by determining candidate time lengths and resource allocations for 2-Step and 4-Step RACH through random access feedback, using different PRACH resources and modulation schemes to optimize system performance based on specific scenario requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If 2-Step RACH is used, then access time is reduced, but collision probability increases
Solution Approach 1:
The patent implements dynamic switching between 2-Step RACH and 4-Step RACH procedures based on real-time channel conditions and traffic requirements. The network can flexibly configure and switch between the two random access types, allowing the system to adapt to varying collision probabilities and time delay requirements differentially for different UEs or access scenarios.
Solution Approach 2:
The patent changes key parameters of the random access procedure including time interval configurations, resource allocations, and modulation schemes. By adjusting parameters such as the time interval between Msg1 and MsgA, and configuring different PRACH resources for 2-Step versus 4-Step RACH, the system optimizes the trade-off between access speed and collision probability.
2Reliability
If 4-Step RACH is used, then collision probability is reduced, but access time increases
Solution Approach 1:
The patent implements dynamic switching between 2-Step RACH and 4-Step RACH procedures based on real-time channel conditions and traffic requirements. The network can flexibly configure and switch between the two random access types, allowing the system to adapt to varying collision probabilities and time delay requirements differentially for different UEs or access scenarios.
Solution Approach 2:
The patent changes key parameters of the random access procedure including time interval configurations, resource allocations, and modulation schemes. By adjusting parameters such as the time interval between Msg1 and MsgA, and configuring different PRACH resources for 2-Step versus 4-Step RACH, the system optimizes the trade-off between access speed and collision probability.
3Adaptability or versatility
If different PRACH resources are allocated for 2-Step and 4-Step RACH, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the random access resources by creating separate PRACH resource pools for 2-Step RACH and 4-Step RACH procedures. Different physical random access channels, time-frequency resources, and preamble sequences are allocated to each access type, allowing independent optimization and management of resources for each procedure while maintaining clear separation to simplify implementation.
Solution Approach 2:
The patent implements a universal random access framework that supports both 2-Step and 4-Step RACH procedures through a common control mechanism. The same base station and UE infrastructure handles both access types by interpreting configuration parameters and switching between procedures, achieving multi-functionality without requiring entirely separate systems.
Data Source
AI summary
The present disclosure provides a method and a device for use in communication node for wireless communications. The communication node transmits a first sequence; receives first information, and the first information is used to determine X candidate time lengths; transmits a second sequence and determines whether to transmit a second radio signal; a time interval between a time for transmitting the first sequence and a time for transmitting the second sequence is not less than a target time length; a first time length is equal to one of the X candidate time lengths, and the target time length is not greater than the first time length; when the first time length is greater than 0, the first communication node randomly selects the target time length between 0 and the first time length. The present disclosure improves random access performance.