UE Downlink Signal Detection in Fixed Frame Period for 5G Unlicensed Band
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Solution Overview
Problem
In the 5G New Radio (NR) system, User Equipment (UE) faces challenges in detecting Channel Occupancy (CO) in unlicensed frequency bands due to poor channel quality, which affects uplink transmission and downlink reception probabilities.
Innovation Solution
The method involves detecting a downlink signal in a Fixed Frame Period (FFP) and determining that an uplink transmission or downlink reception can be performed if the signal is successfully detected, allowing the UE to quickly occupy the unlicensed frequency band and improve channel occupancy probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station notifies the UE through GC-PDCCH that the base station has obtained the CO, then the UE can perform uplink transmission or downlink reception in the COT, but the UE may not detect the GC-PDCCH successfully due to poor channel quality
Solution Approach 1:
The base station performs channel sensing and obtains channel occupancy before notifying the UE, allowing the UE to perform uplink transmission or downlink reception without needing to successfully detect the GC-PDCCH. The channel access is already secured in advance by the base station.
Solution Approach 2:
The patent introduces a new signaling mechanism where the base station sends indication information through downlink data channels (PDSCH) instead of relying solely on GC-PDCCH. This intermediary approach provides an alternative path for the UE to obtain channel occupancy information when GC-PDCCH detection fails.
2Ease of operation
If the UE relies on GC-PDCCH detection to determine channel occupancy, then the system follows the standard notification procedure, but the probability of successful uplink transmission or downlink reception decreases due to poor channel quality
Solution Approach 1:
The base station can notify the UE of channel occupancy through multiple channels: GC-PDCCH, PDSCH, and direct channel sensing by the UE. This multi-functional approach ensures that at least one notification method works even if others fail due to poor channel quality.
Solution Approach 2:
The patent changes the notification parameter from GC-PDCCH-only to include multiple notification methods with different detection requirements. The UE can adaptively select the most suitable detection method based on channel conditions, improving overall reliability.
Data Source
AI summary
A method and apparatus for receiving data, a storage medium and a terminal are provided. The method includes: detecting a downlink signal in a Fixed Frame Period (FFP); and determining that an uplink transmission or a downlink reception can be performed in the FFP in response to the downlink signal being detected in the FFP.