5G NR Radar Signaling Using SRS to Limit RF Interference
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Solution Overview
Problem
Current 3GPP standards lack strategies for integrating radar functionality into 5G/NR systems without causing RF interference to base stations or neighbor UEs.
Innovation Solution
Utilize existing 3GPP NR framework to allocate RF resources for radar signals using predefined communication signals like Sounding Reference Signals (SRS), ensuring compliance with 3GPP standards by configuring time, frequency, and power levels to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar functionality is integrated into 5G/NR devices using the mmWave RF transceiver, then radar signal transmission capability is improved, but RF interference to base stations or neighbor UEs may occur
Solution Approach 1:
The base station performs preliminary actions by allocating specific time and frequency resources for radar signals before the UE transmits. The network configures the UE with dedicated SRS resources that are pre-planned to avoid interference, ensuring that radar transmissions occur only in authorized time-frequency slots that do not conflict with communication signals.
Solution Approach 2:
The base station acts as an intermediary that mediates between the radar functionality and the communication system. It receives radar signal requirements from the UE, processes the resource allocation, and provides configured SRS parameters that balance radar performance with communication interference avoidance. The network controller coordinates radar resource allocation across multiple UEs to prevent mutual interference.
2Adaptability or versatility
If existing 3GPP NR framework is used for radar signal generation, then alignment with communication standards is improved, but current standards lack strategy for integrating radar application
Solution Approach 1:
The Sounding Reference Signal (SRS) is made universal by enabling it to serve dual purposes: traditional uplink channel estimation for communication and radar signal transmission for sensing applications. The base station configures SRS resources with parameters that satisfy both communication requirements (channel sounding) and radar requirements (range resolution, velocity measurement), allowing one signal type to fulfill multiple functions without requiring separate radar signal definitions in the 3GPP framework.
Solution Approach 2:
The invention utilizes parameter changes by adjusting SRS configuration parameters (frequency bandwidth, time resources, power levels, antenna ports) to optimize for different radar applications while maintaining compatibility with communication standards. The base station dynamically configures these parameters based on the specific radar use case, enabling the same SRS framework to support various radar functions from simple presence detection to precise ranging and velocity measurement.
3Object-affected harmful factors
If radar signal is transmitted using configured time and frequency resources, then interference to communication signals is reduced, but radar signal transmission flexibility is constrained
Solution Approach 1:
The radar signal transmission is made dynamic through network-configured SRS resources that can be adaptively adjusted. The base station can dynamically allocate different time-frequency resources, power levels, and bandwidth configurations based on current communication traffic conditions and radar application requirements. This dynamic resource allocation allows the system to optimize the trade-off between interference avoidance and radar performance in real-time, rather than using fixed rigid resource assignments.
Solution Approach 2:
The time-frequency resources are segmented into specific SRS resource blocks that are separated from communication signal resources. The base station divides the available spectrum and time into distinct segments, allocating specific SRS resource blocks for radar transmissions while reserving other segments for communication. This segmentation approach allows independent optimization of radar and communication signals without mutual interference, while still providing flexibility within the allocated radar segments.
Data Source
AI summary
A wireless communications device that operates in a wireless communications system performs a radar function. This involves obtaining required radio frequency (RF) properties of a radar signal to be used for the radar function, wherein the radar function is one of a plurality of radar functions supported by the wireless communications device, each having a respective one of a plurality of different required RF properties. A transceiver of the wireless communications device is configured to transmit a predefined signal of the wireless communications system using time and frequency resources associated with the predefined signal of the wireless communications system and that satisfy the required RF properties of the radar signal. The configured transceiver is used to transmit the predefined signal of the wireless communications system.