CSI Interference Reporting for Joint Sensing and Communication
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Solution Overview
Problem
Wireless communication systems face challenges in managing interference between sensing signals and communication signals, particularly in 5G networks, due to differences in signal characteristics, which can lead to distorted channel state information (CSI) measurements and inefficient resource allocation.
Innovation Solution
The method involves transmitting a first reference signal for communication and a second reference signal associated with a sensing signal, allowing user equipment (UE) to determine CSI based on the interference from the sensing signal and report it to the base station, enabling the base station to adjust parameters for improved communication signal transmission power and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensing signals and communication signals share the same wireless medium, then spectrum efficiency is improved, but interference between signals increases causing distorted CSI measurements
Solution Approach 1:
The patent segments the reference signal resources into distinct types: communication reference signals (CRS) and sensing reference signals (SRS). By assigning separate reference signal resources for communication and sensing functions, the system can measure and report CSI specifically for communication signals while accounting for sensing signal interference, thereby maintaining measurement accuracy while enabling spectrum sharing.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of interference measurement resources (IMR) that specifically measure the interference caused by sensing signals. This intermediary measurement allows the system to quantify and compensate for sensing-induced interference in CSI calculations, resolving the contradiction between spectrum sharing and measurement accuracy.
2Device complexity
If traditional CSI measurement methods are used without accounting for sensing signal interference, then measurement process is simple, but CSI accuracy deteriorates due to unaccounted interference
Solution Approach 1:
The measurement process is segmented into distinct phases: communication reference signal measurement, sensing reference signal interference measurement, and combined CSI calculation. By separating the measurement of communication signals from sensing interference, the system maintains procedural clarity while improving accuracy through dedicated interference measurement resources.
Solution Approach 2:
The system performs preliminary interference measurement by configuring specific interference measurement resources (IMR) that capture sensing signal interference characteristics before final CSI calculation. This preliminary action of measuring interference separately allows for more accurate CSI derivation without significantly increasing overall system complexity.
3Productivity
If communication parameters are optimized without considering sensing signal interference, then communication resource allocation is efficient, but communication reliability decreases due to unaccounted interference
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures interference from sensing signals using configured IMR resources and reports this interference information back to the network. This feedback loop enables the base station to optimize communication parameters such as modulation and coding scheme (MCS), transmit power, and resource allocation while explicitly accounting for sensing-induced interference, thereby maintaining both efficiency and reliability.
Solution Approach 2:
The system dynamically adjusts communication parameters based on measured sensing interference levels. When sensing interference is detected, the base station can change parameters such as lowering transmission power, adjusting MCS to more robust configurations, or reallocating time-frequency resources, thereby maintaining communication reliability despite the presence of sensing signals.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive one or more reference signals associated with a sensing signal, and transmit a sensing interference report that indicates one or more parameters for reducing interference for the sensing signal. Numerous other aspects are provided.