Radar Detection in FDD Wireless Networks
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Solution Overview
Problem
In wireless communication networks using frequency-division duplexing, radar detection is hindered by the limited time available for monitoring radar signals due to high traffic duty cycles, especially in downlink frequency bands, where simultaneous data reception and detection are challenging.
Innovation Solution
The system modifies the transmission and monitoring schedule by designating specific subframes in the downlink frequency band for radar detection, allowing the apparatus to refrain from transmitting during these times and focus on monitoring for radar signals, utilizing a switch or electronic processor to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the apparatus continuously transmits data in the downlink frequency band to maintain high productivity, then the traffic duty cycle increases and data transmission efficiency improves, but the time available for radar signal monitoring decreases and radar detection reliability deteriorates
Solution Approach 1:
The patent segments the downlink frequency band operation into distinct time intervals: normal data transmission periods and dedicated radar monitoring periods (quiet periods). During quiet periods, transmission is temporarily suspended to allow uninterrupted radar signal detection. This segmentation resolves the contradiction by allocating specific time slots for each function, ensuring both high data transmission efficiency during active periods and reliable radar detection during quiet periods.
2Productivity
If the apparatus attempts to simultaneously receive data and monitor for radar signals during receive mode, then continuous operation is maintained, but radar detection reliability becomes uncertain due to interference from received data signals
Solution Approach 1:
The patent extracts the radar monitoring function from the simultaneous data reception process by implementing dedicated quiet periods where data transmission is suspended and the receiver is exclusively dedicated to radar signal detection. This separation ensures that radar detection occurs without interference from data signals, resolving the contradiction by removing the conflicting operation (data reception) during critical detection intervals.
3Productivity
If the traffic duty cycle is increased to improve network throughput, then more time is allocated to data transmission, but the limited time available for radar detection reduces measurement precision
Solution Approach 1:
The patent implements periodic quiet periods at predetermined intervals within the downlink frequency band operation. These periodic intervals are specifically allocated for radar signal monitoring, ensuring that regardless of high traffic duty cycles, the system consistently dedicates time to radar detection. This periodic structure guarantees sufficient detection precision while maintaining high overall network throughput through efficient use of transmission time.
Data Source
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AI summary
An apparatus, configured to communicate with an access terminal in a wireless network and operating in a frequency-division duplexing mode, can be caused to refrain from transmitting during at least one subframe of a frame of a downlink frequency band, and can be caused to monitor for the radar transmission during the at least one subframe of the frame of the downlink frequency band. Optionally, a placement of the at least one subframe within the frame of the downlink frequency band can correspond to a placement of at least one subframe that is designated for an uplink communication within a frame of a wireless network that is operating in accordance with the Long-Term Evolution Time-Division Duplex standard, or can correspond to a placement of at least one subframe that is designated for a transmission in accordance with the Multimedia Broadcast Multicast Service specification.