Sidelink Groupcast HARQ Feedback for Low-Overhead D2D Reliability
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Solution Overview
Problem
Existing sidelink groupcast communication in D2D networks faces challenges in achieving reliable data transmission with high efficiency and reduced latency, particularly in scenarios like 3GPP NR V2X, due to the overhead of HARQ feedback signals.
Innovation Solution
Implementing a mechanism where UEs within a groupcast group share HARQ feedback resources, using only NACK signals to minimize overhead and reduce the need for blind detection of scheduling assignments, thereby optimizing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If device-to-device communication is established without network infrastructure, then communication availability is improved in remote areas, but communication reliability deteriorates due to lack of network coverage
Solution Approach 1:
The patent introduces a relay device as an intermediary between user equipment and the network infrastructure. This relay device receives signals from user equipment and forwards them to the network, enabling communication in areas without direct network coverage while maintaining connection to the core network infrastructure.
Solution Approach 2:
The patent extends communication from traditional two-dimensional cellular coverage to three-dimensional spatial coverage by utilizing relay devices that can be positioned at various locations (including aerial platforms) to create additional communication pathways and extend network reach into previously uncovered areas.
2Area of stationary object
If relay devices are deployed to extend coverage, then communication coverage is improved, but device complexity increases due to additional infrastructure requirements
Solution Approach 1:
The relay device is designed to perform multiple functions: it acts as a signal receiver, signal processor, and signal transmitter, while also providing local network anchoring capabilities. This multi-functionality reduces the need for separate specialized devices and simplifies the overall infrastructure.
Solution Approach 2:
The relay device autonomously performs signal reception, processing, and forwarding operations without requiring complex centralized control for each individual relay node. The device self-manages its communication functions, reducing the operational complexity of deploying and managing multiple relay devices.
Data Source
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AI summary
The subject application is related to a method and apparatus for Device-to-Device communication. A method for Device-to-Device communication includes transmitting a signal toward a group of user equipments (UEs); detecting a HARQ feedback signal accumulated by signal (s) from one or more UEs within the group of UEs; and transmitting a signal toward the group of UEs, wherein the UE and the group of UEs are configured to perform groupcast transmission.