Two-Step Random Access Response Reception for Beam Failure Recovery
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Solution Overview
Problem
In existing communication systems, a base station cannot determine whether a terminal initiates a random access procedure due to beam failure recovery, as the UE cannot correctly receive a random access response message, leading to reliability issues.
Innovation Solution
The terminal receives the random access response message of the 2-step random access procedure triggered by beam failure recovery in common or UE-specific search spaces, ensuring synchronized spatial information with the base station for reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses existing random access mechanisms, then the terminal can initiate beam failure recovery, but the base station cannot determine whether the random access is triggered by beam failure recovery, causing the terminal to fail to receive the random access response message correctly
Solution Approach 1:
The terminal sends indication information along with the random access message to pre-notify the base station about the beam failure recovery trigger before the base station processes the random access message. This preliminary action allows the base station to correctly identify and respond to beam failure recovery requests, preventing loss of the random access response message.
Solution Approach 2:
Indication information serves as an intermediary element that carries the trigger cause from the terminal to the base station. This intermediary enables the base station to distinguish between random access triggered by beam failure recovery and other types of random access, ensuring correct handling and delivery of the random access response message.
2Device complexity
If the terminal initiates random access without indicating the trigger cause, then the procedure is simpler, but the base station cannot determine whether it is beam failure recovery triggered
Solution Approach 1:
The indication information is merged with the random access message into a single transmission. The terminal includes both the random access message and the indication information about the trigger cause in the same uplink transmission, eliminating the need for separate signaling and keeping the procedure simple while ensuring reliable identification of beam failure recovery triggers.
Solution Approach 2:
The random access message structure is designed to serve multiple functions: it carries both the random access request and the indication of the trigger cause. This multi-functional design allows the base station to identify beam failure recovery triggers without adding separate complex procedures, maintaining simplicity while improving reliability.
Data Source
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AI summary
Provided in the embodiments of the present invention are a transmission method and device. The method comprises: determining first spatial information; and according to the first spatial information, receiving, in a CSS and/or a USS, a random access response message of a two-step random access process triggered by beam failure recovery (BFR). A terminal can receive, in a common search space and/or a user-equipment-dedicated search space, a random access response message of a two-step random access process triggered by beam failure recovery (BFR), thereby improving the reliability of a communication system.