Sidelink Wakeup Resource Allocation for Half-Duplex Collision Avoidance
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Solution Overview
Problem
Conventional methods for wakeup signaling in sidelink communication and related resource allocation are deficient, leading to potential collisions and interference due to simultaneous use of resources by UEs operating in half-duplex mode.
Innovation Solution
A resource allocation scheme that defines non-overlapping time resources for UEs to transmit and receive WUSs via sidelink communication, using a joint index and Latin square approach to avoid collisions, applicable for bi-directional paging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs use conventional resource allocation for wakeup signaling in sidelink communication, then resource utilization is simple, but transmission reliability deteriorates due to collisions and interference in half-duplex mode
Solution Approach 1:
The resource pool is segmented into multiple resource sets, where each UE is assigned to a specific resource set based on its ID. This segmentation prevents collisions by ensuring that UEs in different sets use different time-frequency resources for WUS transmission, thereby improving reliability without requiring complex dynamic coordination.
Solution Approach 2:
The patent changes the parameter of resource allocation from dynamic negotiation to static assignment based on UE ID. By mapping UE identifiers to specific resource sets, the system transforms the resource allocation mechanism into a deterministic process that eliminates collisions while maintaining simplicity.
2Productivity
If UEs transmit and receive WUS simultaneously in half-duplex mode, then communication efficiency is improved, but transmission reliability deteriorates due to self-interference and resource conflicts
Solution Approach 1:
The patent implements periodic WUS transmission opportunities structured in frames and subframes. Each UE is assigned specific periodic time resources within the half-duplex framework, allowing efficient bidirectional communication while preventing self-interference through time-division separation of transmit and receive occasions.
Data Source
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Figure 3A~3C
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify an indication of a wakeup signal (WUS) configuration for the first UE, the WUS configuration indicating a WUS monitoring occasion for sidelink wakeup signaling between the first UE and a second UE. The UE may determine a first set of resources for transmission of a WUS by the first UE within the WUS monitoring occasion based on the WUS configuration, the first set of resources disjoint in time with a second set of resources for the second UE within the WUS monitoring occasion. The UE may transmit the WUS to the second UE using the first set of resources within the WUS monitoring occasion based on an identification of traffic for the second UE at the first UE.