Random Access Configuration via Historical Records in 5G Unlicensed Bands
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Solution Overview
Problem
The integration of 5G NR technology into unlicensed frequency bands faces challenges with increased random access latency due to the listen before talk (LBT) mechanism, leading to low success rates and poor stability in random access processes, particularly when using different random access modes.
Innovation Solution
A method for determining a random access configuration of a terminal by receiving and sending historical random access records between the terminal and base station, allowing for adaptive selection between two-step and four-step random access modes based on reference signal receiving power thresholds and access history, to optimize random access success rates and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the listen before talk (LBT) mechanism is used in unlicensed frequency bands, then coexistence with other access technologies is ensured, but random access latency increases and success rate decreases
Solution Approach 1:
The patent applies dynamics by making the random access mode configurable and adaptable. The base station can dynamically select between two-step and four-step random access modes based on network conditions, and the terminal can be configured to use different modes via RRC signaling. This dynamic adaptation allows the system to optimize between latency (two-step) and reliability (four-step with LBT) depending on the operational context in unlicensed bands.
2Adaptability or versatility
If different random access modes are used, then access flexibility is improved, but access stability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors random access success rates and network conditions, then adjusts the random access mode configuration accordingly. The base station sends RRC messages to configure the terminal's random access mode based on observed performance, creating a closed-loop system that maintains stability while preserving flexibility. This feedback-driven approach prevents random switching between modes that would destabilize access performance.
3Reliability
If four-step random access mode is used with LBT, then access reliability is improved, but access latency increases
Solution Approach 1:
The patent resolves this contradiction by making the random access mode dynamic rather than fixed. The system can switch between four-step mode (higher reliability with LBT) and two-step mode (lower latency) based on real-time network conditions, terminal capabilities, and service requirements. This dynamic selection allows the system to achieve both reliability and low latency in different scenarios, rather than being constrained to one mode.
Data Source
AI summary
A method for determining random access configuration of a terminal, performed by the terminal. The method includes: receiving an obtaining request, sent by a base station, for a historical random access record; and sending the historical random access record associated with the obtaining request to the base station.