Cross-Carrier Sensing Reference Signal Triggering for Low-Latency 5G
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Solution Overview
Problem
The increasing bandwidth allocation and diverse use cases in wireless communications systems, such as 5G and beyond, lead to challenges in multiplexing sensing and communication signals, resulting in collisions and increased latency due to limited frequency and time domain resources within a single frequency carrier.
Innovation Solution
Implementing aperiodic sensing reference signal (S-RS) triggering across frequency carriers to reduce latency and collisions by enabling cell selection, downlink control information format selection, and defining a timeline for triggering signals in carrier aggregation scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sensing and communication signals are multiplexed within a single frequency carrier, then spectral efficiency is improved, but signal collisions and latency increase due to limited frequency and time domain resources
Solution Approach 1:
The patent extends the sensing signal resources from a single frequency carrier to multiple frequency carriers (carrier aggregation), adding a frequency dimension to the resource space. This allows sensing reference signals to be transmitted simultaneously across multiple carriers, thereby increasing spectral efficiency while avoiding collisions through frequency diversity rather than being constrained by time-domain multiplexing alone.
2Quantity of substance
If sensing and communication signals are multiplexed within a single frequency carrier, then spectral efficiency is improved, but signal collisions increase due to limited frequency and time domain resources
Solution Approach 1:
The patent introduces multiple frequency carriers as an additional dimension for sensing signal transmission. By distributing sensing reference signals across multiple carriers with different frequency resources, the system achieves frequency diversity that reduces signal collisions while maintaining high spectral efficiency.
3Loss of time
If aperiodic sensing reference signal triggering is implemented across frequency carriers, then latency is reduced, but system complexity increases due to cell selection and control information format requirements
Solution Approach 1:
The patent configures multiple sensing reference signal resources across different frequency carriers in advance, with pre-defined timing relationships and control information formats. When triggering is needed, the system can immediately activate a pre-configured resource on a selected carrier, avoiding the need for real-time resource allocation and reducing latency despite the increased configuration complexity.
Data Source
AI summary
Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, an example of a process includes receiving a triggering signal in a first frequency carrier. The triggering signal includes control information indicating one of aperiodic sensing signal reception or aperiodic sensing signal transmission in a second frequency carrier. The process further includes performing, based on the control information, one of aperiodic sensing signal reception or aperiodic sensing signal transmission in the second frequency carrier.