Sidelink Resource Pool Configuration Without PSFCH in 5G
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing device-to-device resource pools without a Physical Sidelink Feedback Channel (PSFCH) resource, particularly in next-generation 5G networks, where sidelink communication modes lack effective feedback mechanisms for resource allocation and HARQ processes.
Innovation Solution
A method where a first device receives a configuration from a network node for a sidelink resource pool without PSFCH resources, and schedules sidelink grants to indicate sidelink resources, allowing for sidelink transmissions without relying on Physical Uplink Control Channel (PUCCH) resources for feedback, enabling sidelink Hybrid Automatic Repeat Request (HARQ) processes to operate without PSFCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink resource pool is configured without PSFCH resources, then resource allocation efficiency is improved and device complexity is reduced, but HARQ feedback mechanism becomes inadequate
Solution Approach 1:
The patent introduces the PUCCH channel as an intermediary mechanism to carry SL HARQ feedback when PSFCH resources are not configured. The network node configures PUCCH resources for reporting SL HARQ feedback, allowing the system to maintain reliable feedback mechanisms while operating without dedicated PSFCH resources, thus resolving the contradiction between resource efficiency and feedback reliability
Solution Approach 2:
The patent changes the feedback reporting parameter from PSFCH-based to PUCCH-based when PSFCH resources are unavailable. The network node detects whether PSFCH resources are configured and dynamically adjusts the feedback mechanism accordingly, switching to PUCCH for HARQ feedback reporting when needed, thereby maintaining system reliability while allowing flexible resource allocation
2Device complexity
If PUCCH resources are not provided for SL HARQ feedback, then device complexity is reduced and resource overhead is minimized, but feedback reporting capability is lost
Solution Approach 1:
The patent implements a feedback mechanism where the network node detects the configuration status of PSFCH resources and determines whether to configure PUCCH resources for SL HARQ feedback. This feedback loop ensures that when PSFCH is not available, PUCCH resources are properly configured to maintain feedback capability, while avoiding unnecessary complexity when PSFCH is already configured
Solution Approach 2:
The patent creates a dynamic configuration system where the network node can adaptively switch between PSFCH-based and PUCCH-based feedback mechanisms. The system dynamically adjusts the feedback reporting path based on the configured resources, maintaining operational simplicity while ensuring feedback capability is always available through the appropriate channel
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a first device. In one embodiment, the method includes the first device receiving a configuration, from a network node, of a first sidelink resource pool without any Physical Sidelink Feedback Channel (PSFCH) resource. The method further includes the first device receiving a first sidelink grant transmitted, configured, or scheduled by the network node, wherein the first sidelink grant schedules or indicates at least a first sidelink resource in the first sidelink resource pool. Furthermore, the method includes the first device expecting or considering that the first sidelink grant provides no Physical Uplink Control Channel (PUCCH) resource for reporting Sidelink (SL) Hybrid Automatic Repeat Request (HARQ) feedback.