Multiple Backscatter Thresholds for Interference-Limited Decoding
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Solution Overview
Problem
Backscattering-based communications devices, such as RFID tags, face challenges in successful signal decoding due to their low power transmission, which is further exacerbated by interference from other transmitting devices, leading to insufficient signal-to-interference-plus-noise ratios.
Innovation Solution
A receiving UE selects different threshold values for channel metric thresholds based on whether a transmission is associated with a backscattering-based communications device, measures the transmission, and adjusts resource allocation to ensure successful data reading from these devices by minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backscattering-based communications devices transmit signals, then communication is enabled, but signal strength is insufficient due to low power transmission
Solution Approach 1:
The patent introduces a receiving UE as an intermediary that performs channel measurements and selects appropriate threshold values based on whether the transmission is from a backscattering-based device. This intermediary mechanism allows the system to compensate for the low transmission power of backscattering devices by adjusting detection parameters rather than requiring the transmitting device to increase power.
Solution Approach 2:
The patent changes the parameter of channel metric threshold values based on the transmission type. When a transmission is associated with a backscattering-based communications device, a first threshold value is selected, while a second threshold value is selected for other transmissions. This parameter adjustment allows the system to adapt to the different signal characteristics and power levels of different transmission sources.
2Productivity
If other transmitting devices transmit signals, then system productivity is maintained, but interference increases and degrades backscattering-based communication
Solution Approach 1:
The patent implements preliminary channel measurements and threshold selections before actual data transmission occurs. By measuring the channel and selecting appropriate threshold values in advance based on the transmission type, the system prepares optimal detection parameters that will minimize interference effects during the actual communication, allowing other devices to transmit without severely degrading backscattering-based communication.
3Device complexity
If a single threshold value is used for all transmissions, then device complexity is reduced, but communication reliability deteriorates for backscattering-based devices
Solution Approach 1:
The patent applies different threshold values for different transmission types. A first threshold value is used for transmissions associated with backscattering-based communications devices, while a second threshold value is used for other transmissions. This local differentiation of quality parameters allows each transmission type to receive optimized detection parameters, improving reliability without requiring complex dynamic adjustment mechanisms.
Data Source
AI summary
A UE may receive an SCI for a first transmission. The UE may select a threshold value for a channel metric threshold. A first threshold value may be selected for the channel metric threshold if the SCI indicates that the first transmission is associated with a backscattering-based communications device. A second threshold value may be selected for the channel metric threshold if the SCI indicates that the first transmission is not associated with the backscattering-based communications device. The first threshold value may be different from the second threshold value. The UE may measure at least a portion of the first transmission to generate a channel metric for the first transmission. The UE may transmit a second transmission using resources selected based on the channel metric and the channel metric threshold.