Wireless BWP Switching for Uplink Recovery in Unlicensed Bands
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission and reception procedures, particularly in unlicensed bands, leading to ambiguity about active bandwidth parts (BWPs) due to failure in channel access procedures.
Innovation Solution
A method and apparatus that involve switching from a first BWP to a second BWP based on bandwidth part switching information, and further to a third BWP upon failure of initial uplink transmission, with the third BWP being an initial active BWP or a preconfigured BWP, to ensure efficient uplink transmission in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal switches to a second BWP based on BWP switching information, then the signal transmission efficiency is improved, but ambiguity about active BWP arises when uplink transmission fails
Solution Approach 1:
The terminal sends feedback information to the base station to indicate whether uplink transmission was successfully performed in the second BWP. This feedback mechanism resolves the ambiguity about whether the terminal is still in the second BWP or has switched back, allowing the base station to accurately track the terminal's BWP state and adjust subsequent communications accordingly.
Solution Approach 2:
The terminal performs preliminary BWP switching to the second BWP before attempting uplink transmission. By preparing the BWP switch in advance based on received BWP switching information, the terminal optimizes transmission efficiency while the subsequent feedback indicates whether the switch was successful and if the terminal should remain in or return to the second BWP.
2Loss of information
If the terminal fails to perform uplink transmission in the second BWP, then the ambiguity resolution is improved, but the transmission time is increased
Solution Approach 1:
The terminal transmits feedback information promptly after attempting uplink transmission in the second BWP, indicating whether the transmission was successful. This timely feedback allows the base station to quickly determine the terminal's current BWP state and make appropriate scheduling decisions, minimizing the time required to resolve ambiguity without unnecessary delays.
Solution Approach 2:
The terminal has already performed the BWP switch to the second BWP as a preliminary action before attempting transmission. When transmission fails, the terminal uses this pre-established BWP context and feedback mechanism to efficiently return to or remain in the appropriate BWP, reducing the overall time needed compared to not having performed the preliminary switch.
Data Source
AI summary
The present invention relates to a wireless communication system, specifically, to a method and an apparatus therefor, the method comprising: receiving BWP switching information from a first BWP; switching from the first BWP to a second BWP on the basis of the BWP switching information; switching to a third BWP different from the second BWP on the basis of transmission failure of a first uplink from the second BWP; and transmitting a second uplink from the third BWP, wherein the third BWP is one from among the first BWP, an initially activated BWP used for initial access, and a previously configured BWP.