Random Access Resource Configuration for 5G Unlicensed Spectrum
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Solution Overview
Problem
In 5G communication systems, the performance of random access is affected by higher subcarrier spacing, which shortens OFDM symbol and slot lengths, and in unlicensed spectrum systems, configuring random access resources and determining available resources are challenging due to channel condition detection and listen before talk operations.
Innovation Solution
A method for user equipment (UE) to acquire random access resource configuration information, determine subcarrier spacing of the random access preamble, and identify a random access occasion (RO) based on this information, allowing for efficient transmission of random access preambles, even in high subcarrier spacing scenarios and unlicensed spectrum systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If higher subcarrier spacing is used to achieve higher data rates, then data rate is improved, but OFDM symbol and slot lengths are shortened causing random access performance degradation
Solution Approach 1:
The patent determines subcarrier spacing parameters dynamically based on frequency position and random access configuration. By adjusting subcarrier spacing according to the specific frequency band and configuration index, the system maintains optimal random access performance across different operating conditions while supporting high data rates in higher frequency bands.
2Adaptability or versatility
If random access resources are configured in unlicensed spectrum systems, then wireless communication capability is improved, but channel condition detection and listen before talk operations increase system complexity
Solution Approach 1:
The patent performs channel condition detection and determines available random access resources in advance before actual random access transmission. By pre-configuring random access occasions based on listen-before-talk results and channel conditions, the system reduces real-time decision complexity while maintaining adaptability to unlicensed spectrum requirements.
3Productivity
If random access resources are pre-configured, then random access efficiency is improved, but conflict probabilities increase in high subcarrier spacing scenarios
Solution Approach 1:
The patent dynamically determines random access occasions by combining pre-configured resource pools with real-time subcarrier spacing adjustments. The random access configuration index and slot group indicators allow the system to adapt resource allocation to current channel conditions and traffic patterns, maintaining efficiency while reducing conflicts through flexible resource selection.
Data Source
AI summary
A random access method for a user equipment (UE) and apparatus thereof, and a random access method for a base station and apparatus thereof. The random access method for the user equipment (UE) comprises: acquiring random access resource configuration information; determining a subcarrier spacing of a random access preamble; determining a random access occasion (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble; and transmitting the random access preamble on the determined RO.