UE-Assisted Backscatter Relay for AIoT Interference Reduction
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Solution Overview
Problem
Direct communication between a UE and an AIoT device using passive radio equipment faces challenges due to the need for full-duplex communications and potential interference between the transmitted carrier wave and the backscattered signal.
Innovation Solution
A method where a first UE identifies a second UE to relay information from a backscattered signal, allowing the first UE to transmit a carrier wave to the AIoT device, which modulates and reflects it as a backscattered signal. The second UE receives this signal and transmits the encoded information back to the first UE, potentially using sidelink resources to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE directly communicates with an AIoT device using passive radio equipment, then communication with the AIoT device is enabled, but the UE requires full-duplex communications capability which increases device complexity and cost
Solution Approach 1:
The patent introduces a second UE as an intermediary relay node between the first UE and the AIoT device. The second UE receives the backscattered signal from the AIoT device and forwards it to the first UE, eliminating the need for the first UE to perform full-duplex operations. This mediator approach resolves the contradiction by offloading the complex signal processing requirements to a dedicated relay device.
Solution Approach 2:
The communication function is segmented into separate roles: the first UE generates the carrier wave, the AIoT device modulates and backscatters the signal, and the second UE receives and relays the backscattered signal. This segmentation allows each device to perform a simplified function, reducing the complexity burden on any single device while maintaining overall system capability.
2Productivity
If a UE transmits a carrier wave and receives backscattered signal simultaneously, then communication efficiency is improved, but interference between transmitted carrier wave and backscattered signal occurs
Solution Approach 1:
The second UE acts as a spatial and functional intermediary that receives the backscattered signal at a different location and time than the first UE's transmission. This physical separation and time delay introduced by the relay mechanism reduce the interference between the transmitted carrier wave and the received backscattered signal, resolving the contradiction between communication efficiency and signal interference.
Solution Approach 2:
The system employs periodic time-division multiplexing where the first UE transmits carrier waves in specific time intervals, and the second UE receives and relays backscattered signals in corresponding intervals. This periodic action pattern allows the system to achieve efficient communication while minimizing interference through controlled timing separation between transmission and reception phases.
3Object-generated harmful factors
If frequency shift is applied to separate carrier wave and backscattered signal, then interference is reduced, but the requirement for large frequency shifts increases device complexity
Solution Approach 1:
The second UE relay eliminates the need for large frequency shifts by providing a different reception path for the backscattered signal. The intermediary device can process the signal at its local receiver and forward it to the first UE through a separate communication channel, thereby reducing interference without requiring complex frequency shifting mechanisms at the AIoT device or the first UE.
4Object-generated harmful factors
If complex filters are used to separate signals, then interference is minimized, but device complexity and cost increase
Solution Approach 1:
The second UE serves as a relay that simplifies the filtering requirements. Instead of requiring the first UE to implement complex filters to separate the transmitted carrier wave from the received backscattered signal, the system uses the second UE to receive the backscattered signal separately and forward it through a different channel, thereby minimizing interference without requiring complex filtering hardware at the first UE.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the complexity and cost of UEs by allowing half-duplex communications and minimizing interference, enabling effective communication with AIoT devices without the need for large frequency shifts or complex filters.
Implementation Method 1
a first UE 604a to transmit a carrier wave 605 to an AIoT device 606, which modulates and reflects it as a backscattered signal 607
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communications by an apparatus. A method includes transmitting, to a user equipment (UE), an indication of a first frequency of a first signal and an indication of a second frequency of a backscattered signal corresponding to the first signal; transmitting the first signal; and receiving, from the UE, information encoded in the backscattered signal.