Random Access Method Reducing Latency in 5G Systems
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and NR systems, face high latency issues in the random access process due to the contention-based random access procedure, which is not adaptable for low-latency services.
Innovation Solution
The proposed solution involves a method where User Equipment (UE) receives a random access response message and monitors a physical downlink control channel (PDCCH) based on identification information, allowing contention resolution without the need for a Message 4 procedure, thereby reducing latency and improving time efficiency by completing the contention-based random access through a Message 2 procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contention-based random access procedure using Message 4 is implemented, then system access reliability is improved, but access latency increases to approximately 40 milliseconds
Solution Approach 1:
The patent extracts and removes the Message 4 procedure from the random access process. By taking out the contention resolution message transmission step, the system achieves contention resolution through earlier messages (Message 2 or Message 3), thereby reducing access latency from 40ms to approximately 20ms while preserving access reliability through alternative contention resolution mechanisms.
Solution Approach 2:
The patent implements preliminary contention resolution actions by embedding contention resolution information in earlier messages (Message 2 RAR or Message 3 PUSCH). Instead of waiting for Message 4 to resolve contention, the system performs contention resolution preliminarily in earlier stages of the random access procedure, reducing the overall access time while maintaining reliability.
2Reliability
If a Message 4 random access procedure is used, then contention resolution is achieved, but the process complexity and time consumption increase
Solution Approach 1:
The patent merges the contention resolution function with earlier messages in the random access procedure. By combining contention resolution information with Message 2 (RAR) or Message 3 (PUSCH), the system eliminates the need for a separate Message 4 procedure, thereby reducing procedure complexity and time consumption while maintaining contention resolution capability.
Solution Approach 2:
The patent makes earlier messages multi-functional by enabling them to serve both as data transmission vehicles and as contention resolution mechanisms. Message 2 and Message 3 are designed to carry both access grant information and contention resolution information, reducing the need for additional dedicated messages and simplifying the overall procedure.
Data Source
AI summary
Provided are a random access method and device and a computer storage medium. The method may include: receiving a random access response (RAR) message based on first identification information, the RAR message including second identification information; and monitoring a physical downlink control channel (PDCCH) in a preset time window based on the second identification information or third identification information associated with the second identification information, the PDCCH being scrambled through the second identification information or the third identification information.