5G Random Access CORESET Configuration for Bandwidth Parts
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Solution Overview
Problem
In 5G NR systems, the behavior of user equipment (UE) is unclear when there is no explicitly configured control resource set (CORESET) corresponding to a random access response (RAR) or no corresponding CORESET #0 for an active downlink bandwidth part (BWP), leading to potential communication interruptions.
Innovation Solution
The method involves receiving configuration information of the currently active downlink BWP or serving cell and monitoring the random access response RAR based on the configuration of a control resource set CORESET, with options to fall back to a default CORESET #0 or a specific BWP if no CORESET is configured, ensuring proper random access processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic and flexible bandwidth allocation is implemented to support narrow-band terminals and energy-saving mode, then adaptability and energy efficiency are improved, but device complexity increases due to multiple bandwidth parts configuration
Solution Approach 1:
The system bandwidth is divided into multiple bandwidth parts (BWPs), each with different bandwidth configurations. The terminal can be configured with multiple BWPs and switch between them based on operational mode (narrow-band, wide-band, or energy-saving), allowing flexible adaptation without requiring the terminal to support the maximum system bandwidth continuously.
2Reliability
If beamforming technology with multiple antenna arrays is deployed to achieve higher directivity and throughput, then transmission quality is improved, but device complexity and cost increase
Solution Approach 1:
The system dynamically switches between different bandwidth parts and beam configurations based on terminal capabilities and operational requirements. Narrow-band terminals can operate with fewer antenna elements and simpler beamforming, while wide-band terminals utilize full bandwidth with more sophisticated beamforming, avoiding the need for all terminals to have complex high-frequency antenna arrays.
3Productivity
If the system operates in large-bandwidth mode to maximize throughput, then data transmission capacity is improved, but power consumption increases and implementation cost rises
Solution Approach 1:
The terminal dynamically switches between different bandwidth parts based on traffic requirements and power saving needs. When high throughput is required, the terminal activates wider BWPs; when power saving is prioritized, the terminal switches to narrower BWPs, thereby adapting bandwidth usage to actual operational needs rather than always operating at maximum capacity.
4Device complexity
If no explicit CORESET configuration is provided for random access response in active downlink BWP, then configuration simplicity is improved, but UE behavior becomes unclear leading to communication interruptions
Solution Approach 1:
The patent establishes default CORESET configuration rules that are pre-defined in the specification. When no explicit CORESET is configured for the active downlink BWP, the UE automatically applies these default rules to determine the CORESET for monitoring random access responses, ensuring that the random access procedure can always proceed without ambiguity.
Data Source
AI summary
The present disclosure provides a random access method, a terminal, and a network device. The random access method of the present disclosure comprises: receiving configuration information concerning a currently activated downlink bandwidth part (BWP) or a serving cell; detecting a random access response (RAR) in a random access procedure according to the configuration of a control resource set (CORESET) in the configuration information of the currently activated downlink BWP or the configuration information of the serving cell.