Base Station LBT Mechanism for Unlicensed Band Random Access Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems using unlicensed bands for random access, the base station's failure to occupy a channel within a preset time window can lead to incorrect assumptions about the transmission failure of random access preambles, resulting in unnecessary delays, resource wastage, and interference.
Innovation Solution
The method involves the base station occupying a control channel in the unlicensed band through a Listen Before Talk (LBT) mechanism without backoff within a first time window, allowing for the rapid transmission of a first random access feedback indicating successful receipt of the random access preamble, thereby avoiding premature retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses a conventional LBT mechanism with backoff to occupy the unlicensed band channel, then the channel access follows standard protocols, but the base station may fail to occupy the channel within the preset time window, causing the terminal to mistakenly assume random access preamble transmission failure and retransmit, resulting in unnecessary delays and resource waste
Solution Approach 1:
The patent changes the LBT mechanism parameter from using backoff (conventional) to using no backoff (innovative). This parameter change allows the base station to occupy the unlicensed band channel more quickly and reliably within the preset time window, preventing terminal retransmission errors and reducing random access delay while maintaining channel access reliability
Solution Approach 2:
The patent applies preliminary action by having the base station perform channel occupation using LBT without backoff before the terminal expects feedback. This preliminary successful channel occupation ensures the base station can transmit the random access feedback message on time, preventing the terminal from mistakenly assuming transmission failure and avoiding unnecessary retransmission delays
2Measurement precision
If the base station fails to occupy the channel in the preset time window, then the terminal cannot receive feedback and assumes transmission failure, but this leads to unnecessary preamble retransmissions that waste communication resources and cause interference
Solution Approach 1:
The patent implements feedback by ensuring the base station successfully occupies the channel and transmits the random access feedback message within the preset time window. This reliable feedback prevents the terminal from making incorrect transmission failure assumptions, eliminating unnecessary preamble retransmissions and avoiding communication resource waste and interference
Solution Approach 2:
The base station performs preliminary channel occupation using LBT without backoff before the feedback transmission deadline. This preliminary action guarantees the base station has channel access when needed, ensuring accurate feedback delivery to the terminal and preventing resource wastage from erroneous retransmissions
Data Source
AI summary
A method, device, and non-transitory computer-readable storage medium are provided. The method may be applied to a base station. The base station may receive a random access preamble, transmitted by a terminal through an unlicensed band. The base station may occupy, in a first time window, a first control channel in the unlicensed band through a Listen Before Talk (LBT) mechanism without backoff. The first time window may be a time window where the terminal occupies the unlicensed band. The base station may transmit a first random access feedback is transmitted through the first control channel. The first random access feedback may indicate that the base station receives the random access preamble.