RAN Relay Sidelink Switching for Reliable D2D Communication
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Solution Overview
Problem
In wireless communication networks, communication between a user device and a destination entity via a base station connected via a relay device may be hindered by lost connections, insufficient quality of service, or unmet requirements such as latency, bandwidth, or end-to-end reliability, especially in scenarios where direct connections are not feasible.
Innovation Solution
Implementing a wireless communication network with relay devices providing dual bidirectional links using the Uu interface for RAN communication and PC5 interface for device-to-device (D2D) or sidelink (SL) communication, allowing user devices to perform direct communications through relay devices when conventional connections are lost or inadequate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If communication is performed via base station through relay device, then network coverage is extended, but connection reliability deteriorates due to lost connections or insufficient quality of service
Solution Approach 1:
The relay device acts as an intermediary between the user device and the base station, enabling communication in areas where direct base station coverage is unavailable. The relay device receives signals from the base station via the first interface and forwards them to the user device via the second interface, thereby extending network coverage while maintaining connection reliability through alternative communication paths.
Solution Approach 2:
The relay device is designed with multi-functionality, supporting both the first interface for communication with the base station and the second interface for direct communication with user devices. This universal design allows the relay device to perform multiple functions: extending coverage, providing alternative communication paths, and ensuring service continuity, thereby resolving the contradiction between coverage extension and connection reliability.
2Productivity
If direct device-to-device communication is implemented, then communication efficiency is improved, but device complexity increases due to multiple interface requirements
Solution Approach 1:
The communication system is segmented into distinct functional interfaces: the first interface handles communication between the relay device and the base station, while the second interface handles direct device-to-device communication. This segmentation allows each interface to be optimized independently, improving communication efficiency while managing device complexity through functional separation.
Solution Approach 2:
The relay device incorporates multiple interfaces (first and second interfaces) to enable both traditional network-mediated communication and direct device-to-device communication. This multi-functionality allows the system to switch between communication modes based on requirements, improving overall communication efficiency while the modular interface design helps manage the inherent complexity.
3Reliability
If alternative relay resources are utilized, then quality of service is maintained, but resource allocation complexity increases
Solution Approach 1:
The system dynamically allocates and switches between different relay resources (first relay resources for base station communication, second relay resources for direct device communication) based on real-time quality of service requirements. This dynamic resource allocation allows the system to maintain quality of service by selecting the most appropriate communication path while the automated switching mechanism manages the complexity of resource coordination.
Solution Approach 2:
The system employs feedback mechanisms to monitor the quality of service on different communication paths and dynamically adjust resource allocation. When the first interface path experiences degradation, the feedback triggers switching to the second interface path, ensuring quality of service is maintained. This feedback-driven approach automates the complex resource allocation process, reducing manual intervention while maintaining service quality.
Data Source
AI summary
A wireless communication network is described, which includes one or more relay devices and one or more user devices, UEs. A relay devices provides a first bidirectional link having first relay resources, and a second bidirectional link having second relay resources, the first and second bidirectional links using a first interface for a communication with a radio access network, RAN, of the wireless communication network, e.g., the Uu interface. A UE is to perform a direct communication with a network entity of the wireless communication network via the relay device on one or more the first relay resources or on one more of the first and second relay resources using a second interface for a device-to-device, D2D, or sidelink, SL, communication in the wireless communication network, e.g., the PC5 interface.