2-Step Random Access MsgB SubPDU Structure for 5G Delay Reduction
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Solution Overview
Problem
Current wireless communication systems face delays in random access procedures, particularly in 5G communication systems, which hinder efficient data transmission and network performance.
Innovation Solution
A 2-step random access method is introduced, utilizing a message (MsgB) that includes a media access control (MAC) protocol data unit (PDU) with specific subPDUs for backoff indicators, response to successful reception, fallback random access responses, and radio resource control messages, to reduce the complexity and delay of the random access process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-step random access procedure is used, then the random access process is more reliable and complete, but the access delay increases
Solution Approach 1:
The patent combines multiple random access messages into a single MsgB transmission. Specifically, MsgB includes both the random access response (RAR) and contention resolution information in one unified message structure, allowing the UE to complete the random access procedure in 2 steps instead of 4, thereby reducing access delay while maintaining reliability
Solution Approach 2:
The patent segments MsgB into multiple subPDUs (sub-protocol data units), where each subPDU carries different types of information (RAR, contention resolution, backoff indicators). This segmentation allows efficient organization and processing of different message components within a single transmission frame, optimizing both reliability and timing
2Ease of operation
If multiple random access messages are transmitted separately, then each message can be processed independently, but the overall procedure complexity and delay increase
Solution Approach 1:
The patent merges RAR, contention resolution information, and backoff indicators into a single MsgB transmission with multiple subPDUs. This reduces the number of separate message exchanges from 4 to 2 steps, simplifying the overall procedure while maintaining the ability to process different information types independently through the subPDU structure
Solution Approach 2:
MsgB is designed as a universal message structure that can carry multiple types of information (RAR for timing alignment, contention resolution for collision handling, backoff indicators for retry management) in a single transmission. This multi-functional design reduces procedure complexity while preserving independent processing capabilities through type identification fields
Data Source
AI summary
The present disclosure provides a method, performed by a user equipment (UE), of performing a random access procedure, the method including: receiving random access configuration information from a base station; and performing a 2-step random access procedure or a 4-step random access procedure with the base station based on the configuration information, wherein the random access configuration information includes both parameter information for the 2-step random access procedure and parameter information for the 4-step random access procedure.