Sensing Reference Signal PRF Staggering for Doppler Ambiguity Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in mitigating Doppler ambiguities and maximizing detectable velocity in radio frequency sensing, particularly in the context of 5G wireless standards like New Radio (NR), due to limitations in the transmission and reception of sensing reference signal resources.
Innovation Solution
The implementation of pulse repetition frequency (PRF) staggering across sensing reference signal resources, including staggering across different frequency bands and varying timing of pulses in the time domain, to enhance coherent processing intervals and mitigate Doppler ambiguities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reference signal transmission is used, then system simplicity is maintained, but Doppler ambiguities cannot be mitigated and maximum detectable velocity is limited
Solution Approach 1:
The patent applies periodic action by implementing pulse repetition frequency (PRF) staggering, where reference signals are transmitted in periodic pulses with varying repetition frequencies across different time intervals or frequency resources. This periodic transmission pattern with controlled variations enables coherent processing while mitigating Doppler ambiguities, resolving the contradiction between sensing accuracy and transmission complexity.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the pulse repetition frequency (PRF) across different time intervals or frequency resources. By varying the PRF parameter in a controlled manner (staggering), the system enhances coherent processing intervals and mitigates Doppler ambiguities without requiring fundamentally new transmission mechanisms, thus improving sensing accuracy while managing complexity.
2Duration of action of moving object
If uniform reference signal transmission is used, then transmission simplicity is maintained, but coherent processing intervals cannot be maximized
Solution Approach 1:
The patent uses periodic action with staggered pulse repetition frequencies to extend coherent processing intervals. By transmitting reference signals in periodic pulses with controlled PRF variations across time or frequency, the system maintains coherence over longer intervals while managing transmission complexity through structured periodic patterns.
Solution Approach 2:
The patent applies dynamics by making the pulse repetition frequency variable rather than fixed. The PRF is dynamically adjusted in a staggered pattern across different time intervals or frequency resources, enabling the system to maximize coherent processing intervals while adapting to different sensing conditions without requiring completely new transmission infrastructure.
3Measurement precision
If standard reference signal resources are used, then resource allocation simplicity is maintained, but Doppler ambiguity mitigation is insufficient
Solution Approach 1:
The patent employs parameter changes by varying the pulse repetition frequency parameter across different resource allocations. By implementing PRF staggering where different time intervals or frequency resources use different PRF values, the system achieves superior Doppler ambiguity mitigation and velocity detection precision while maintaining structured resource configuration that manages complexity.
Solution Approach 2:
The patent applies segmentation by dividing the reference signal transmission into multiple segments with different PRF characteristics. By allocating different pulse repetition frequencies to different time intervals or frequency resources (segmenting the overall transmission), the system achieves comprehensive Doppler ambiguity mitigation across various velocity ranges while organizing resource configuration in a manageable segmented structure.
Data Source
AI summary
Disclosed are techniques for wireless sensing. In an aspect, a sensing node receives, from a sensing entity, a configuration of one or more sensing reference signal resources for a sensing session, wherein the configuration indicates a staggering pattern of a plurality of staggers of the one or more sensing reference signal resources across a plurality of time intervals, a plurality of frequency intervals, or both, and wherein each of the plurality of staggers includes one or more repetitions of the one or more sensing reference signal resources, and transmits or receives the one or more sensing reference signal resources according to the staggering pattern.