Sidelink Resource Reservation Signaling for Low-Power Collision Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high energy consumption and prolonged delays associated with channel sensing in contention-based sidelink communication, particularly in Mode 2, lead to reduced battery life in wireless devices.
Innovation Solution
A method for contention-based sidelink transmission and reception that involves obtaining information about a transmission resource pool and a resource reservation pool, monitoring reservation resources for potential collisions, and transmitting a resource reservation signal to indicate intended use of a transmission resource, using a low-power receiver and simple modulation schemes to reduce power consumption and collision risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device performs channel sensing by decoding all signals in the transmission resource pool, then the resource selection reliability is improved, but the power consumption increases significantly
Solution Approach 1:
The patent extracts the essential sensing function from the complete channel sensing procedure. Instead of decoding all signals in the transmission resource pool, the device only monitors reservation resources for reservation signals. This extraction maintains the core sensing capability while eliminating unnecessary processing, thereby reducing power consumption while preserving resource selection reliability.
Solution Approach 2:
The patent segments the transmission resource pool into two distinct parts: reservation resources for reservation signals and transmission resources for actual data transmission. By separating these functions, the device can monitor only the reservation resources for collision detection without needing to decode all transmission signals, thus reducing power consumption while maintaining reliable resource selection.
2Measurement precision
If the wireless device performs complete channel sensing, then the collision detection accuracy is improved, but the sensing time and latency increase
Solution Approach 1:
The patent extracts only the collision detection function from the complete sensing procedure. By monitoring only reservation resources for reservation signals, the device achieves sufficient collision detection accuracy without the time cost of decoding all transmission signals. This extraction maintains measurement precision for collision detection while significantly reducing sensing time.
Solution Approach 2:
The patent segments the sensing process into monitoring reservation resources (for collision detection) and ignoring transmission resources (for full decoding). This segmentation allows the device to achieve accurate collision detection in a fraction of the time required for complete channel sensing, as it only needs to detect the presence or absence of reservation signals.
3Reliability
If the wireless device monitors all transmission resources for sensing, then the resource availability assessment is improved, but the power consumption and processing load increase
Solution Approach 1:
The patent extracts the resource availability assessment function from complete transmission resource monitoring. By focusing only on reservation resources and their reservation signals, the device maintains accurate resource availability assessment with significantly reduced processing load. The extraction eliminates the need to decode and process all transmission signals while preserving the essential assessment capability.
Solution Approach 2:
The patent segments the resource pool into reservation resources (for availability assessment) and transmission resources (for actual communication). This segmentation allows the device to assess resource availability by monitoring only reservation signals, reducing processing load while maintaining reliable assessment, as the reservation signals provide sufficient information about resource availability without requiring full signal decoding.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a method performed by a wireless transmitter device, for contention-based sidelink transmission. The method comprises obtaining information defining a transmission resource pool and a resource reservation pool comprising one or more reservation resources associated with respective transmission resources in the transmission resource pool. The method comprises monitoring a reservation resource associated with a transmission resource selected by the wireless transmitter device for sidelink transmission, for a resource reservation signal transmitted by one or more other wireless transmitter devices attempting to reserve the same transmission resource. The method comprises: upon determining based on the monitoring that the transmission resource is available, transmitting, after the monitoring, to a wireless device, using the reservation resource, a resource reservation signal indicating that the wireless transmitter device intends to use the transmission resource. The timing of the transmission of the resource reservation signal is randomly selected by the wireless transmitter device.