Random Access Message Retransmission for Beam and Timing Failures
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Solution Overview
Problem
In wireless communication systems, particularly in two-step random access procedures, there are challenges with the reception of initial random access messages by base stations, leading to transmission failures due to unknown or outdated timing adjustments, different numerologies, and varying beam selection, which can hinder effective communication establishment.
Innovation Solution
The proposed solution involves determining transmission failures at the user equipment (UE) and initiating retransmissions of at least a portion of the random access message, leveraging time/frequency/space diversity, and using feedback mechanisms to ensure proper reception and decoding by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a two-step random access procedure is implemented to reduce latency, then access speed is improved, but transmission reliability deteriorates due to timing adjustments and beam selection issues
Solution Approach 1:
The base station performs preliminary actions by transmitting timing adjustment information and beam management information to the UE before the random access procedure. This allows the UE to pre-configure its transmission parameters, reducing the likelihood of transmission failures and improving reliability while maintaining fast access speeds.
Solution Approach 2:
The base station provides feedback to the UE through timing adjustment information and beam management information. This feedback mechanism allows the UE to adjust its transmissions based on network conditions, improving transmission reliability in the fast two-step random access procedure.
2Reliability
If timing adjustments are applied to synchronize transmissions, then communication reliability is improved, but system complexity increases due to unknown or outdated timing information
Solution Approach 1:
The patent extracts the timing adjustment information from the complex random access procedure and provides it separately to the UE before the actual access attempt. This separation simplifies the UE's task by providing ready-to-use timing information, reducing system complexity while maintaining communication reliability.
3Reliability
If beam management is implemented to distinguish retransmissions, then reception reliability is improved, but processing complexity increases at the base station
Solution Approach 1:
The base station applies beam management information locally to specific UE transmissions, allowing it to distinguish retransmissions from initial transmissions based on beam characteristics. This localized approach improves reception reliability while minimizing overall processing complexity by focusing computational resources only where needed.
Data Source
AI summary
Aspects described herein relate to determining a failure associated with reception, by a base station, of an initial transmission of a random access message transmitted by the UE in a two-step random access procedure, and based on determining the failure situations associated with reception of the random access message, configuring the parameters of a retransmission and/or retransmitting at least a portion of the random access message.