NR-U Random Access Configuration with Time Domain Gaps
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Solution Overview
Problem
In the NR-U system, there is a lack of effective solutions for configuring Rach Occasions (ROs) for 2-step random access, leading to inefficiencies in random access and potential collisions between terminals.
Innovation Solution
A method and apparatus for acquiring random access configuration information, where a base station configures a random access index for a terminal to acquire PRACH configuration information indicating ROs for 2-step random access with GAPs in the time domain, allowing the terminal to initiate random access efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ROs are configured continuously in time domain for 2-step random access, then random access coverage is improved, but collision probability between terminals increases
Solution Approach 1:
The patent segments continuous ROs into discrete ROs separated by GAPs in the time domain. This segmentation allows terminals to perform LBT operations between ROs, reducing collision probability while maintaining adequate random access coverage by providing multiple separated opportunities for access.
Solution Approach 2:
The patent implements periodic RO configuration with regular GAPs between them, creating a periodic pattern of access opportunities. This periodic structure allows terminals to systematically attempt random access at intervals, balancing coverage requirements with collision avoidance through timed separation.
2Object-affected harmful factors
If GAPs are introduced between ROs in time domain, then collision between terminals is reduced, but random access efficiency decreases
Solution Approach 1:
The patent adjusts the timing parameters of ROs by introducing configurable GAPs between them. By changing the time domain parameters of RO configuration, the system reduces collisions while managing the efficiency trade-off through optimized GAP durations that balance separation needs with access speed.
Solution Approach 2:
The patent makes the RO configuration dynamic by allowing flexible GAP insertion based on channel conditions and traffic requirements. This dynamic adjustment enables the system to optimize the balance between collision reduction and access efficiency according to real-time network conditions.
3Reliability
If multiple ROs are configured for 2-step random access, then random access reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the random access configuration into multiple discrete ROs with clear time domain separation. This segmentation improves reliability by providing multiple independent access opportunities while managing complexity through structured, repeatable patterns rather than arbitrary configurations.
Solution Approach 2:
The patent creates a universal RO configuration framework that can serve multiple functions: providing redundancy for reliability, enabling LBT operations for collision avoidance, and offering flexible adaptation to different traffic conditions. This multi-functionality reduces the need for separate mechanisms, thereby managing system complexity.
Data Source
AI summary
A random access configuration information obtaining method. The method is executed by a base station, and comprises: configuring a random access index for a terminal, the random access index being configured to instruct the terminal to obtain physical random access channel (PRACH) configuration information of a new radio based unlicensed access (NR-U). wherein the PRACH configuration information indicates rach occasions (ROs) for 2-step random access, and the PRACH configuration information indicates that there is a time interval between the ROs in time domain.