Backscatter Channel Separation for Zero-Power Terminal Communication
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Solution Overview
Problem
In zero-power communication systems, network devices face self-interference issues due to downlink signals interfering with backscattered signals from zero-power terminals, particularly when operating in the same or adjacent channels.
Innovation Solution
Implementing constraints on channel selection and time domain positioning to separate uplink and downlink signals, ensuring frequency domain isolation to avoid self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device transmits downlink signals and receives backscattered signals in the same channel, then communication efficiency is improved, but self-interference occurs
Solution Approach 1:
The patent segments the communication system into separate uplink and downlink channels, preventing the network device from transmitting and receiving signals in the same channel. This segmentation eliminates self-interference while maintaining communication efficiency through dedicated channels for each direction.
Solution Approach 2:
The patent introduces a guard period as an intermediary time interval between downlink signal transmission and uplink backscattered signal reception. This guard period acts as a mediator that prevents overlapping of signals, eliminating self-interference while allowing efficient channel utilization.
2Adaptability or versatility
If multiple channels are deployed for zero-power terminal operation, then system flexibility is improved, but channel management complexity increases
Solution Approach 1:
The patent applies different channel configurations for uplink and downlink communications, with specific constraints on which channels can be used for backscattered signals. This local differentiation simplifies channel management by establishing clear, channel-specific rules rather than requiring complex unified management.
Solution Approach 2:
The patent pre-establishes constraints and rules for channel selection before communication occurs. The network device is configured in advance with permitted uplink channels and guard periods, eliminating the need for real-time complex channel management decisions and reducing operational complexity.
3Adaptability or versatility
If the zero-power terminal operates in any channel after activation, then communication adaptability is improved, but interference with network device reception increases
Solution Approach 1:
The patent segments the available channels into uplink channels for backscattered signals and downlink channels for network device transmissions. By restricting the zero-power terminal to specific uplink channels and separating them from downlink channels, the patent maintains communication adaptability while preventing interference with network device reception.
Solution Approach 2:
The patent introduces a temporal dimension through guard periods between downlink transmission and uplink reception. This time-domain separation creates an additional dimension for interference management, allowing the zero-power terminal to operate adaptably in any uplink channel without interfering with downlink reception.
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
Effectively reduces self-interference by ensuring non-adjacent channel usage for uplink and downlink communications, enhancing signal decoding capabilities in network devices.
Implementation Method 1
transmits a second signal to the network device, the second signal being a backscattered signal of the first signal
Data Source
AI summary
A communication method and apparatuses are provided. The method includes: receiving, by a terminal device, a first signal sent by a network device and sending, by the terminal device, a second signal to the network device. The second signal is a backscatter signal of the first signal, a channel where the second signal is located satisfies a first constraint, and/or a time domain position where the second signal is located satisfies a second constraint.