UE Relay IP Packet Forwarding for Out-of-Range D2D Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in enabling direct device-to-device (D2D) communication between mobile devices that are out of range, particularly in public safety and network overload scenarios, as they rely heavily on infrastructure and do not efficiently facilitate relay communications.
Innovation Solution
The implementation of UE-UE relay communication using Layer-3 relaying, where a relay UE discovers and establishes links between source and remote UEs, allowing for IP address assignment and direct communication through service discovery protocols like Bonjour, enabling communication even when devices are outside direct range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrastructure-based communication is used, then network coverage and reliability are improved, but network load increases and data rates decrease
Solution Approach 1:
The patent introduces a relay UE as an intermediary device that forwards communications between UEs outside direct range. The relay UE establishes separate links with source and remote UEs, enabling indirect communication without increasing overall network load on the RAN. This mediator approach resolves the contradiction by providing infrastructure-like reliability through a trusted intermediate node while maintaining network efficiency through direct peer-to-peer forwarding.
2Productivity
If direct D2D communication is implemented, then network load is reduced and data rates increase, but communication range is limited
Solution Approach 1:
The patent extends D2D communication from direct single-hop to multi-hop relay communication. By adding the relay UE dimension to the communication path, the system achieves extended range while maintaining the efficiency benefits of direct D2D links. The source UE and remote UE remain connected through direct D2D links to the relay, preserving high data rates while overcoming the range limitation through spatial extension.
3Length of moving object
If relay communication is established, then communication range is extended, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the relay UE autonomously discovers remote UEs, establishes links, and manages IP address assignments without centralized control. The source UE independently selects relays based on discovery information, and the relay UE automatically configures network parameters. This self-organizing approach extends communication range while minimizing the complexity burden on individual devices by distributing intelligence across the ad-hoc network.
Data Source
AI summary
A user equipment (UE) is configured to receive a request from a first peer UE to communicate with a target user corresponding to a second peer UE. The UE is configured to determine that the second peer UE is within a communication range of the UE. The UE is configured to, in response to receiving the request, relay internet protocol (IP) packets from the first peer UE to the second peer UE and relay IP packets from the second peer UE to the first peer UE.