ISAC Sensing Thresholds and Timers for RCS Variance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face issues such as incorrect triggering of sensing reference signal resource release due to radar cross-section (RCS) variance, leading to false alarms and ping-pong handovers, especially in scenarios involving unmanned aerial vehicles (UAVs) with rotating targets, and inefficient use of radio resources.
Innovation Solution
Implementing dynamic assignment of radio resources for sensing reference signals based on fluctuating RSRP and monitoring area changes, using sensing thresholds and timers to optimize sensing operations and reduce false alarms and handover issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing operations are continuously performed to accurately detect target objects, then measurement precision is improved, but loss of energy increases due to continuous transmission of sensing reference signals
Solution Approach 1:
The system performs sensing operations periodically rather than continuously. The network device configures a timer length that determines the periodic interval for sensing reference signal transmission. The second wireless device monitors sensing reference signals at periodic intervals defined by the timer, enabling energy-efficient sensing while maintaining detection accuracy through regular monitoring cycles.
2Reliability
If sensing reference signals are transmitted frequently to detect target objects, then reliability of sensing detection is improved, but loss of time increases due to timer management and monitoring cycles
Solution Approach 1:
The network device pre-configures the timer length and sensing threshold before sensing operations begin. This preliminary configuration allows the second wireless device to execute sensing operations efficiently without real-time decision-making delays. The pre-set parameters enable automatic timer management and monitoring cycle execution, reducing processing time while maintaining reliable detection.
3Reliability
If sensing threshold is set low to reduce false alarms from RCS variance, then reliability is improved, but measurement precision deteriorates due to increased false negatives
Solution Approach 1:
The system introduces an intermediary mechanism where the network device configures both the sensing threshold and timer length working together. The timer acts as a mediator that filters out transient signal fluctuations caused by RCS variance. By requiring signal strength to exceed the threshold for the entire timer duration rather than instantaneously, the system reduces false alarms while maintaining detection precision for genuine targets.
4Reliability
If timer length is extended to filter RCS variance fluctuations, then reliability is improved, but loss of time increases due to longer monitoring periods
Solution Approach 1:
The network device dynamically adjusts the timer length parameter based on sensing requirements and RCS variance characteristics. By optimizing the timer length to match the specific application scenario, the system achieves reliable filtering of RCS variance without excessive time delays. The configurable parameter allows balancing between reliability improvement and time loss according to actual operational needs.
Data Source
AI summary
Aspects presented herein relate to methods and devices for wireless communication including an apparatus, e.g., a UE or base station. The apparatus may transmit a configuration of at least one of a sensing threshold or a timer length for a timer associated with a sensing operation, wherein the configuration is transmitted to a second wireless device. The apparatus may also transmit a set of reference signals (RS) associated with the sensing operation, wherein the set of RS is transmitted for the second wireless device. Further, the apparatus may receive an indication of at least one of: (1) a fluctuation in a sensing reference signal received power (RSRP) for the sensing operation, or (2) at least one target object is outside of a monitoring area, wherein the indication is received from the second wireless device.