5G NR Random Access Association Across 2-Step and 4-Step Procedures
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Solution Overview
Problem
The existing 3GPP 5G New Radio (NR) network lacks specific details on associating information stored for 2-step and 4-step random access procedures, leading to inefficiencies in understanding the UE's status at the base station.
Innovation Solution
A method and apparatus for associating 2-step and 4-step random access information by storing them in separate entries and using explicit indexes, sequence numbers, or explicit indexes for each procedure, allowing the base station to determine the chronological order of these procedures based on received messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate entries are used for storing 2-step RA procedure information and 4-step RA procedure information, then the information can be stored independently without confusion, but the complexity of managing and associating information between different procedure types increases
Solution Approach 1:
The patent divides the storage structure into separate entries for 2-step RA procedure information and 4-step RA procedure information. This segmentation allows independent storage and management of different procedure types, preventing information confusion while maintaining clear distinction between procedure categories.
Solution Approach 2:
The patent introduces an association mechanism that acts as an intermediary between separate storage entries. This intermediary enables the base station to link and correlate information from different procedure types (2-step and 4-step RA) without requiring a unified storage structure, thus resolving the complexity of information association while maintaining separate storage benefits.
2Loss of information
If detailed information of both 2-step and 4-step RA procedures is stored and reported, then the base station can fully understand the UE status, but the message size and processing overhead increase
Solution Approach 1:
The patent extracts and reports only the essential and relevant RA procedure information to the base station. By selectively taking out critical status indicators from the complete procedure information, the system maintains comprehensive UE status understanding while reducing the overall message data volume and processing requirements.
Solution Approach 2:
The patent implements partial reporting of RA procedure information, focusing on key status elements rather than complete detailed information. This partial action approach provides sufficient basis for base station decision-making while avoiding the overhead of transmitting and processing excessive data.
3Measurement precision
If the base station determines the order of RA procedures based on received messages, then accurate chronological tracking is achieved, but the processing complexity at the base station increases
Solution Approach 1:
The patent incorporates preliminary ordering information within the reported messages from UE to base station. By including chronological indicators or sequence markers in the transmitted information, the base station can determine procedure order through straightforward comparison rather than complex analysis, thus achieving accurate tracking with minimal processing complexity.
Data Source
AI summary
A method for performing random access includes: performing a 2-step RA procedure with a BS (S401); receiving a fallback RAR from BS (S404); performing a 4-step RA procedure with BS (S405); and associating a 2-step RA information of the 2-step RA procedure with a 4-step RA information of the 4-step RA procedure (S407).