NACK Transmission Scheme Selection by Error Cause in Wireless Links
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) often transmits negative acknowledgments (NACK) via beam sweeping by default, leading to inefficient resource utilization, excessive power consumption, and high uplink load due to unnecessary actions in conveying feedback to a base station.
Innovation Solution
A configured negative acknowledgement transmission scheme is implemented, where the UE detects error causes and selects an appropriate feedback transmission scheme based on error types, such as out of coverage, beam blocking, interference, or frequency selective fading, to optimize resource utilization and reduce power consumption by avoiding unnecessary beam sweeping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE transmits NACK via beam sweeping by default, then feedback reliability is improved, but resource utilization deteriorates and power consumption increases
Solution Approach 1:
The patent changes the transmission parameter (beam sweeping vs. single beam) based on the detected error cause. When errors are due to interference or fading, single beam transmission is used; when errors are due to beam blocking or coverage issues, beam sweeping is employed. This dynamic parameter adjustment resolves the contradiction between reliability and resource utilization.
Solution Approach 2:
The system dynamically selects the feedback transmission scheme based on real-time error cause detection. The UE monitors downlink transmissions, identifies error causes, and adapts the NACK transmission method accordingly. This dynamic behavior allows the system to maintain high reliability only when necessary, improving overall resource utilization.
2Reliability
If UE transmits NACK via beam sweeping by default, then feedback reliability is improved, but power consumption increases
Solution Approach 1:
The transmission parameter is changed from beam sweeping to single beam based on error cause detection. By using single beam transmission for errors caused by interference or fading where beam sweeping is unnecessary, the UE significantly reduces power consumption while maintaining adequate feedback reliability.
Solution Approach 2:
The patent extracts and removes the unnecessary beam sweeping action from the NACK transmission process. By detecting that certain error causes (interference, fading) do not require beam sweeping, the system eliminates this energy-consuming operation while preserving feedback reliability through alternative means.
3Reliability
If UE performs beam sweeping for NACK transmission, then feedback delivery is improved, but device complexity increases
Solution Approach 1:
The patent segments the NACK transmission process into two distinct paths based on error cause: simple single beam transmission for interference/fading errors, and complex beam sweeping for coverage/blocking errors. This segmentation reduces overall device complexity by avoiding unnecessary complex operations.
Solution Approach 2:
The system dynamically adjusts transmission complexity based on error cause detection. By using simple single beam transmission for the majority of error cases (interference, fading) and reserving complex beam sweeping only for necessary cases (coverage, blocking), the average device complexity is reduced while maintaining feedback delivery reliability.
4Productivity
If UE uses single beam for NACK transmission, then resource utilization is improved, but feedback reliability deteriorates for certain error causes
Solution Approach 1:
The patent changes the transmission parameter from single beam to beam sweeping based on detected error causes. When errors are identified as being due to beam blocking or coverage issues, the system switches to beam sweeping mode, ensuring feedback reliability is maintained for these specific cases while preserving resource efficiency for other error types.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For example, a method for wireless communications at a user equipment (UE), may include receiving a configuration indicating a feedback transmission scheme for reporting feedback associated with an error type. The UE may also detect an error in receiving a downlink transmission from a base station, where the detected error is of the error type. Then, the UE may select the feedback transmission scheme for transmitting a negative acknowledgement message for the downlink transmission based at least in part on the detected error being of the error type and the configuration. The UE may also transmit, to the base station, the negative acknowledgement message for the downlink transmission using the selected feedback transmission scheme.