Radar-Aware Resource Scheduling for UE Data Communication
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Solution Overview
Problem
Existing communication systems face interference between radar signals and data signals, necessitating methods to minimize interference and enable coexistence.
Innovation Solution
User equipment and base stations measure radar signals to identify unused resources for data communication, using time and frequency information to determine data periods and resources that do not overlap with radar periods, and perform data communication accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a radar and data communication system share the same time period and frequency band, then resource utilization is improved, but interference between radar signals and data signals increases
Solution Approach 1:
The time period is divided into radar periods and data periods through segmentation. The UE measures radar signals to identify radar periods, then the base station allocates data resources in the remaining time segments (data periods), effectively segmenting the shared time-frequency resource to allow both radar and communication operations without mutual interference
Solution Approach 2:
The system transitions from one-dimensional time-based resource allocation to two-dimensional time-frequency resource allocation. By measuring radar signals in both time and frequency domains, the base station can identify unused frequency bands during radar periods and allocate data resources in the time-frequency plane where radar does not operate, thereby resolving interference while maximizing resource utilization
2Productivity
If data communication is performed during radar periods, then communication productivity is improved, but measurement precision of radar signals deteriorates
Solution Approach 1:
The UE performs preliminary measurement of radar signals before data communication resource allocation. By measuring radar signals in advance and reporting time measurement information to the base station, the system identifies radar periods beforehand, allowing the base station to pre-allocate data resources in time segments that do not overlap with radar operations, thus preserving radar measurement precision while enabling communication
Solution Approach 2:
The UE autonomously measures radar signals and generates time measurement information without requiring radar system intervention. This self-service measurement capability allows the UE to independently identify radar periods and communicate this information to the base station, enabling the system to coordinate radar and communication operations while maintaining radar measurement accuracy
3Reliability
If guard periods are extended to protect radar periods, then radar signal quality is improved, but available data resources decrease
Solution Approach 1:
The base station dynamically adjusts the length and positioning of guard periods based on measured radar signal parameters. By changing guard period parameters (duration, placement) according to actual radar operation characteristics, the system minimizes guard period overhead while ensuring adequate protection of radar signals, thereby maximizing the remaining time-frequency resources available for data communication
Data Source
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AI summary
A method of operating a user equipment, includes: generating time measurement information about a plurality of radar periods in which a radar signal is received on a first frequency band, by measuring the radar signal transmitted from a radar; reporting the time measurement information to a base station; receiving, from the base station, control information based on the time measurement information; identifying, based on the control information, a first data resource included in a data period, which is unused by the radar, between the plurality of radar periods; and performing data communication with the base station based on the first data resource.