Contention-Based Sidelink Resource Reservation for Low-Power Sensing
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Solution Overview
Problem
The existing contention-based sidelink communication protocols in wireless devices, particularly in Mode 2, result in significant energy consumption due to the need for extensive channel sensing, leading to reduced battery life in wireless devices.
Innovation Solution
A method involving a wireless transmitter device that selects a reservation resource randomly from a resource reservation pool and monitors it for potential collisions before transmitting a resource reservation signal, indicating its intent to use a transmission resource, thereby reducing power consumption and collision probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device performs extensive channel sensing to select transmission resources in Mode 2, then the resource selection reliability is improved, but the energy consumption increases significantly
Solution Approach 1:
The patent divides the channel sensing process into two segments: (1) monitoring reservation resources for reservation signals, and (2) only performing full sensing on transmission resources if needed. This segmentation reduces the total sensing time and energy consumption while maintaining reliable resource selection, as the device first checks if any reservations exist before attempting to use a transmission resource.
Solution Approach 2:
The patent introduces preliminary monitoring of reservation resources before actual transmission. By monitoring reservation signals in advance on reservation resources, the device can determine whether a transmission resource is already reserved by another device. This preliminary action prevents collisions without requiring extensive sensing of the entire transmission resource pool, thereby reducing energy consumption while ensuring reliable resource selection.
2Measurement precision
If the wireless device monitors all signals in the transmission resource pool during sensing, then the collision detection accuracy is improved, but the battery life-time is reduced
Solution Approach 1:
The patent extracts the essential function of collision detection from the complete sensing process. Instead of monitoring all signals in the entire transmission resource pool, the device only needs to monitor reservation signals on reservation resources. This extraction maintains collision detection accuracy because reservation signals explicitly indicate when a transmission resource is occupied, while significantly reducing the monitoring scope and energy consumption, thereby extending battery life-time.
3Reliability
If the wireless device performs comprehensive sensing to ensure available resource selection, then the transmission reliability is improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by monitoring only the necessary reservation resources rather than performing comprehensive sensing of the entire transmission resource pool. The device monitors reservation signals on reservation resources, which provides sufficient information to determine transmission availability. This partial monitoring approach maintains transmission reliability by detecting collisions while consuming significantly less power than full sensing would require.
Data Source
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.