Multi-Static Radar in Wireless Networks With UE-Only Reception
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Solution Overview
Problem
Integrating radar-sensing operations into wireless communication networks poses challenges such as interference with communication signals, resource availability, in-device interference, and managing high densities of radar UEs, particularly in compact devices.
Innovation Solution
A wireless communication network performs multi-static radar operations using geographically-diverse access points as transmitters and UEs as receivers, allowing for on-demand radar operations with coordinated illumination signals to balance radar-sensing needs with communication needs, minimizing interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar operations are introduced in a frequency band used by wireless communications, then radar sensing capability is provided, but interference with communication signals occurs and communication resources are reduced
Solution Approach 1:
The patent segments the frequency spectrum by introducing frequency division multiplexing to separate radar and communication signals. Different frequency bands are allocated for radar sensing and communication operations, allowing both functions to coexist without mutual interference. This segmentation resolves the contradiction by providing radar capability while protecting communication signals from interference.
Solution Approach 2:
The patent implements preliminary frequency resource allocation and configuration before radar operations commence. The network node pre-configures frequency resources, time slots, and spatial parameters to ensure radar signals do not interfere with communication signals. This preliminary action allows the system to provide radar sensing while maintaining communication integrity.
2Adaptability or versatility
If radar operations are introduced in a frequency band used by wireless communications, then radar sensing capability is provided, but the number of resources available for communications is reduced
Solution Approach 1:
The patent segments time and frequency resources to allocate specific slots for radar operations and other slots for communication. Through time-division multiplexing and frequency division, the system ensures that radar sensing does not permanently deplete communication resources, allowing both functions to share the spectrum efficiently.
Solution Approach 2:
The patent implements dynamic resource allocation where the network node can adaptively adjust the amount of resources allocated to radar operations based on current needs. When radar sensing is not required, communication resources are dynamically reallocated to maximize available bandwidth for communications, resolving the contradiction between providing radar capability and maintaining communication resource availability.
3Adaptability or versatility
If UEs perform full-duplex transmission for radar sensing, then radar functionality is achieved, but in-device interference occurs
Solution Approach 1:
The patent extracts the radar transmission function from the UE and relocates it to the network node. Instead of UEs performing full-duplex transmission which causes self-interference, the network node transmits radar signals while UEs only receive and process the signals. This extraction eliminates in-device interference while preserving radar functionality.
Solution Approach 2:
The network node acts as an intermediary between the radar signal source and the UE. The network node transmits radar illumination signals, and UEs receive these signals to perform sensing functions. This intermediary approach allows radar operations without requiring UEs to transmit, thereby eliminating in-device interference.
4Area of stationary object
If multiple UEs perform radar sensing simultaneously, then radar coverage is improved, but managing high densities of radar UEs becomes complex
Solution Approach 1:
The patent merges multiple radar sensing functions into a single coordinated system managed by the network node. Instead of independently managing each UE's radar operations, the network node consolidates control, coordinating multiple UEs to receive radar signals from different network nodes. This merging approach expands coverage while simplifying management through centralized coordination.
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 enables efficient radar sensing with reduced interference, power savings, and improved resource management, allowing UEs to perform object detection and self-positioning without full-duplex transmission, while maintaining communication functionality.
Implementation Method 1
a set of access points in the wireless communication network act as radar transmitters, transmitting respective illumination signals for illumination of a target region
Implementation Method 2
an example User Equipment (UE) operates as a radar receiver with respect to the multi-static radar transmission
Data Source
AI summary
A wireless communication network performs multi-static radar operations, including operating multiple access points as geographically-diverse radar transmitters that transmit illumination signals, for illumination of a target region, and an example User Equipment (UE) operates as a radar receiver with respect to the multi-static radar transmission. The network may perform multi-static radar operations on demand, for power savings and interference reduction, and UEs may indicate particular radar-sensing needs or capabilities when requesting multi-static radar operation, for consideration by the network when configuring the corresponding illumination-signal transmissions.