Sidelink Signal Transmission for Integrated Sensing and Communication
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Solution Overview
Problem
In current wireless communication systems, implementing high-precision sensing without affecting communication on a sidelink is challenging, particularly in vehicle-to-everything (V2X) technologies, which require robust sensing capabilities for advanced applications like autonomous driving and emerging technologies such as smart city and smart industry.
Innovation Solution
A signal transmission method that utilizes a first frequency domain resource for sensing measurement in the 1st symbol of a time unit, allowing automatic gain control without affecting data transmission, while using a second frequency domain resource for communication signals, ensuring minimal bandwidth impact and maintaining communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bandwidth for sensing measurement is increased to improve sensing performance, then sensing precision is improved, but the bandwidth available for communication signals is reduced, degrading communication performance
Solution Approach 1:
The patent divides the time unit into multiple symbols and allocates different frequency domain resources to sensing and communication signals in different symbols. Specifically, the first signal for sensing measurement is transmitted in the 1st symbol, while second signals for communication are transmitted in other symbols (2nd to 14th symbols). This temporal segmentation allows both sensing and communication to occur simultaneously without interfering with each other's bandwidth requirements.
Solution Approach 2:
The patent transitions from frequency-domain resource allocation to time-domain resource allocation by utilizing different symbols within a time unit. Instead of competing for the same frequency resources, sensing and communication signals are separated in the time dimension, allowing full bandwidth utilization for both functions without trade-offs.
2Measurement precision
If external sensing devices with higher precision are equipped to improve sensing capability, then sensing precision is improved, but device complexity and cost are increased
Solution Approach 1:
The patent enables the communication signal to serve dual purposes: maintaining communication functionality while simultaneously providing sensing measurement capabilities. By transmitting the first signal in the 1st symbol and utilizing its echo, the terminal device can perform sensing measurements without requiring separate dedicated sensing hardware, thus achieving multi-functionality with existing communication infrastructure.
Solution Approach 2:
The patent merges the sensing function with the communication function by using the same terminal device and signal transmission mechanism for both purposes. The communication signal on the sidelink is utilized for both data transmission and sensing measurement, combining previously separate functions into a unified system that reduces hardware requirements.
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
Enables integrated sensing and communication on a sidelink without loss to communication performance, maximizing sensing measurement bandwidth and achieving better sensing performance through coordinated signal transmission.
Implementation Method 1
the vehicle terminal can transmit an electromagnetic wave through the radar
Implementation Method 2
Based on a principle of a Doppler effect, the vehicle terminal can transmit an electromagnetic wave through the radar, and measure a moving speed of a target relative to the radar based on a received echo
Implementation Method 3
Based on a time difference between the transmitted electromagnetic wave and the received echo, a distance of the target relative to the radar can be measured
Data Source
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AI summary
This application provides a signal transmission method and an apparatus. The method includes: determining a first frequency domain resource in a sidelink resource pool, and sending a first signal through the first frequency domain resource. A bandwidth of the first frequency domain resource is equal to a maximum available bandwidth of the sidelink resource pool; and the first signal is located in a 1st symbol of a first time unit in time domain, where a signal in the 1st symbol is used for automatic gain control, and the first signal is used for sensing measurement on a sidelink. According to the method provided in this application, a first terminal device sends, in the 1st symbol of the first time unit, the first signal used for the sensing measurement, and the first signal may further keep an original function unchanged, that is, the first signal is used for the automatic gain control, so that the sensing measurement is implemented through the first signal without causing a loss to communication performance, and integrated sensing and communication on the sidelink is enabled.