Sidelink Resource Reservation Blocks for DRX-Aligned Collision Avoidance
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Solution Overview
Problem
Existing sidelink communication systems face challenges in power consumption and collision risks due to the assumption of continuous operation, particularly for power-limited devices, which is exacerbated by the introduction of Discontinuous Reception (DRX) without effective alignment in resource selection and transmission timing.
Innovation Solution
A method for resource reservation in contention-based sidelink transmission involving a resource reservation pool with blocks of occasions, allowing devices to transmit resource reservation signals before actual transmission, enabling efficient sensing and collision avoidance aligned with DRX cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Discontinuous Reception (DRX) is introduced for power saving, then power consumption is reduced, but collision risk increases due to misalignment in resource sensing and transmission timing
Solution Approach 1:
The patent applies preliminary action by introducing a resource reservation phase before actual data transmission. Wireless devices perform sensing and reserve resources in advance during DRX active periods, ensuring that transmission resources are confirmed available before entering low-power state. This preliminary resource reservation prevents collisions that would otherwise occur due to DRX-induced timing misalignment, while still enabling power savings during inactive periods.
Solution Approach 2:
The patent segments the transmission process into distinct phases: resource sensing phase, resource reservation phase, and actual transmission phase. This segmentation allows devices to perform sensing and reservations during DRX active periods, then enter low-power state confidently knowing resources are reserved. The segmentation resolves the contradiction by separating the power-consuming sensing activity from the actual transmission timing, enabling DRX operation without increasing collision risk.
2Reliability
If continuous sensing is performed to avoid collisions, then collision risk is reduced, but power consumption increases
Solution Approach 1:
The patent implements periodic sensing aligned with DRX cycles rather than continuous sensing. Devices perform resource sensing and reservations periodically during DRX active periods, then enter low-power inactive periods. This periodic action maintains collision avoidance capability while dramatically reducing power consumption compared to continuous sensing, as devices can sleep during inactive DRX periods without risking collisions due to the prior resource reservation.
3Measurement precision
If resource reservation with multiple occasions is implemented, then sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the resource reservation block into multiple occasions, where each occasion represents a separate sensing opportunity. This segmentation improves sensing accuracy by providing multiple independent measurements of resource availability. The complexity increase is managed by structuring each occasion as a standardized, repeatable procedure that devices can execute efficiently, with the network configuring the number and structure of occasions in advance to balance accuracy requirements against device complexity constraints.
Data Source
AI summary
Disclosed is a method is disclosed, performed by a wireless device, for resource reservation of a contention-based sidelink transmission. The method comprises obtaining information defining a transmission resource pool and a resource reservation pool comprising one or more resource reservation blocks associated with respective transmission resources in the transmission resource pool. The one or more resource reservation blocks comprise a plurality of occasions. The method comprises transmitting a resource reservation signal using a first occasion of a resource reservation block associated with a transmission resource selected by the wireless device for sidelink transmission. The method comprises monitoring one or more other occasions of the resource reservation block for resource reservation signals transmitted by other wireless devices aiming at reserving the same transmission resource. The one or more other occasions are different from the first occasion. The method comprises controlling, based on the monitoring, the sidelink transmission using the transmission resource.