DRX Control for Autonomous Resource Selection in Sidelink Terminals
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Solution Overview
Problem
In wireless communication systems, particularly in NR sidelink communication, the Discontinuous Reception (DRX) operation is not harmoniously adjusted with autonomous resource selection during direct communication between terminals, especially when considering sleep periods and resource allocation modes.
Innovation Solution
A terminal is configured with a reception unit to receive control information from another terminal, a control unit to manage DRX operations and autonomously select resources based on the received information and DRX state, and a transmission unit to perform communication using the selected resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a terminal performs DRX operation with sleep periods in resource allocation mode 2, then power saving is improved, but resource selection and sensing operations become unsynchronized leading to communication inefficiency
Solution Approach 1:
The patent applies dynamics by making the DRX operation adaptive to resource allocation requirements. The terminal dynamically adjusts its reception wake-up timing based on whether it needs to perform sensing or resource selection, allowing the system to switch between power-saving mode and communication-active mode as needed, rather than using a fixed DRX pattern
Solution Approach 2:
The patent implements preliminary action by determining the required reception timing in advance based on the resource allocation mode. Before entering DRX sleep mode, the terminal checks whether sensing or resource selection operations are pending, and only enters sleep mode when these operations are not required, ensuring communication efficiency is not compromised
2Adaptability or versatility
If a terminal autonomously selects resources without considering DRX state, then resource selection flexibility is improved, but communication reliability deteriorates due to missed receptions during sleep periods
Solution Approach 1:
The patent implements feedback by continuously monitoring the DRX state and resource allocation mode, and using this information to adjust resource selection decisions. The terminal receives feedback about its own reception timing requirements and incorporates this into its autonomous resource selection process, ensuring that selected resources do not conflict with DRX wake-up periods
Solution Approach 2:
The patent applies parameter changes by modifying the resource selection parameters based on DRX configuration. When DRX is active, the terminal changes its resource selection behavior to avoid resources that would require reception during sleep periods, while maintaining flexibility in other aspects of resource selection when DRX is not constraining the operation
Data Source
AI summary
A terminal includes a reception unit configured to receive control information from another terminal in a resource pool; a control unit configured to control an operation related to DRX (Discontinuous reception) and autonomously select a resource based on the control information and a state related to the DRX in the resource pool; and a transmission unit configured to perform transmission to the other terminal using the selected resource.