Relay User Equipment D2D Link for Isolated UE Communication
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Solution Overview
Problem
In LTE mobile communication systems, isolated user equipment (IUE) outside the service coverage of an enhanced node B (eNB) faces challenges in maintaining communication, especially in disaster or shadow areas, where relay nodes are often fixed and costly to deploy, and may fail during emergencies.
Innovation Solution
The method establishes a device-to-device (D2D) communication link between an IUE and a relay user equipment (RUE) within the eNB's service coverage, allowing for a relay cellular link to be set up, enabling communication support through a D2D discovery message and authentication, and handover between eNBs when the IUE moves or the link quality degrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay nodes are deployed to provide communication service to isolated user equipment, then communication coverage is extended, but deployment cost and infrastructure complexity increase
Solution Approach 1:
The patent enables user equipment to autonomously perform relay functions by establishing D2D communication links. Isolated user equipment can directly discover and communicate with relay user equipment without requiring network-deployed relay nodes, allowing the system to self-organize and self-service in isolated areas without additional infrastructure deployment
Solution Approach 2:
The patent makes regular user equipment capable of performing multiple functions including normal communication, relay communication, and discovery operations. The same UE can switch between being a normal user device and a relay device, eliminating the need for specialized relay node hardware and reducing infrastructure complexity
2Area of stationary object
If fixed relay nodes are deployed, then communication service is provided in coverage holes, but reliability decreases during disasters when fixed infrastructure may fail
Solution Approach 1:
The patent transforms the static relay node architecture into a dynamic system where any user equipment can become a relay device. The relay function is no longer fixed to specific locations or devices but dynamically assigned based on real-time conditions, allowing the network to adapt and maintain reliability during disasters by utilizing available mobile devices
Solution Approach 2:
The patent introduces discovery messages as an intermediary mechanism that enables isolated user equipment to find and establish connections with relay user equipment. This discovery layer acts as a mediator that facilitates dynamic relay selection and enables the system to adapt to changing conditions, improving reliability by providing multiple potential relay paths
3Ease of manufacture
If D2D communication is established for relay service, then infrastructure cost is reduced, but device complexity and authentication requirements increase
Solution Approach 1:
The patent implements preliminary authentication and discovery operations through standardized D2D protocols before actual relay communication begins. By pre-establishing trust relationships and device identities through authentication messages, the system reduces the complexity of on-the-fly security management and provides a structured framework that simplifies overall device interactions
Data Source
AI summary
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE).A method for providing a device-to-device (D2D) communication-based service for an isolated user equipment (IUE) by a relay user equipment (RUE) in a mobile communication system is provided. The method includes establishing a D2D link with an IUE; and supporting establishment of a relay cellular link for the IUE based on the established D2D link, wherein the RUE is within a service coverage of an enhanced node B (eNB).