NR Backscatter Transmission Using Segmented Bands to Reduce Self-Interference
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Solution Overview
Problem
Conventional backscatter communication systems face challenges with frequency domain resource allocation, leading to sending and receiving self-interference due to close proximity of transmitting and receiving frequencies, particularly in NR systems, which affects performance and efficiency.
Innovation Solution
The method and apparatus allocate frequency domain resources in uplink frequency bands for frequency division duplex, supplementary uplink frequency bands, and ultra high-frequency bands to enable separate transmission and reception of control commands, carrier wave signals, and backscatter information, using duplexer or radio frequency front-end designs to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmitting frequency is close to receiving frequency in conventional backscatter communication, then the system can operate with simpler frequency allocation, but sending and receiving self-interference occurs seriously
Solution Approach 1:
The frequency domain is segmented into different bands: uplink frequency band for frequency division duplex, supplementary uplink frequency band, and ultra high-frequency frequency band. This segmentation allows separate transmission and reception operations to occur at different frequencies, eliminating self-interference while maintaining system simplicity.
2Use of energy by moving object
If passive backscatter communication device uses external excitation signal for backscatter, then energy consumption is reduced, but simultaneous sending and receiving capability is required at the receive end
Solution Approach 1:
The patent introduces frequency as an additional dimension to separate transmission and reception operations. By using different frequency bands for sending and receiving, the system enables simultaneous operations without requiring complex time-division or signal-processing techniques, thus reducing device complexity while maintaining energy efficiency.
3Reliability
If frequency domain resource is allocated for backscatter communication in NR system, then transmission performance is improved, but downlink spectrum may be occupied or interfered
Solution Approach 1:
The patent extracts backscatter communication operations from the downlink spectrum and places them in dedicated uplink and ultra high-frequency bands. This extraction ensures that backscatter transmission does not occupy or interfere with downlink spectra, while still achieving reliable transmission performance through proper frequency domain resource allocation.
Data Source
AI summary
This application discloses a transmission processing method and apparatus. The method includes: obtaining, by a first device, a frequency domain resource. The frequency domain resource is located in at least one type of the following frequency bands: an uplink frequency band for frequency division duplex, a supplementary uplink frequency band, and an ultra high-frequency frequency band. The method further includes: performing, by the first device, first transmission on the frequency domain resource. The first transmission includes at least one of: transmission of a control command; transmission of a carrier wave signal; and transmission of backscatter information.