D2D Relay Communication Using Link-Local IPv6 Address Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing D2D communication technologies face challenges in maintaining session continuity and efficient IP address management, particularly in multi-hop SL unicast communication scenarios, leading to potential IP address changes and reliance on DNS protocols.
Innovation Solution
UEs utilize link-local IPv6 addresses for direct D2D communication, with relay UEs maintaining mappings between IP addresses and device identifiers, allowing seamless IP address retention and eliminating the need for DNS protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay UE allocates IP address to source/target UE, then communication can be established, but source/target UE must change IP address when switching relay UE, impacting data transmission
Solution Approach 1:
The patent extracts the IP address allocation function from the relay UE and assigns it to the source/target UE themselves. Each UE generates its own link-local IPv6 address independently, eliminating the need for relay UE to allocate IP addresses. This extraction resolves the contradiction by ensuring IP address stability remains with the endpoint UEs while relay switching freedom is maintained.
Solution Approach 2:
The source/target UEs perform self-configuration by generating their own link-local IPv6 addresses without relying on relay UE for IP address assignment. This self-service approach allows UEs to maintain consistent IP addresses across different relay connections, ensuring data transmission continuity while adapting to relay switching scenarios.
2Adaptability or versatility
If relay UE acts as DNS server to allocate IP address, then communication path can be established, but UE must support DNS protocol and IP address changes occur during relay switching
Solution Approach 1:
The patent removes the DNS protocol dependency by extracting the address resolution function from the relay UE. Instead of relay UE acting as a DNS server, each UE independently generates its own link-local IPv6 address using standardized IPv6 address generation mechanisms, eliminating the need for DNS protocol support in UEs.
Solution Approach 2:
Each UE performs self-configuration by autonomously generating its own link-local IPv6 address without requiring DNS protocol support. This self-service mechanism simplifies the UE functionality while enabling multi-hop communication through relay UEs that forward packets based on pre-established IP mappings.
3Reliability
If UE uses link-local IPv6 address for D2D communication, then session continuity is maintained and IP address changes are eliminated, but IP address management complexity is reduced
Solution Approach 1:
The patent changes the IP address parameter from dynamically allocated addresses (requiring relay UE involvement) to link-local IPv6 addresses generated by each UE based on its own identifier. This parameter change ensures IP address stability across relay switching while the address generation mechanism remains standardized and manageable.
Data Source
AI summary
Various embodiments of the present disclosure provide a method for direct device-to-device communication. The method which may be performed by a first device comprises generating an Internet protocol address of the first device. The Internet protocol address of the first device may be applicable for direct device-to-device communication between the first device and a second device via a third device. The method further comprises transmitting the Internet protocol address to the third device. According to various embodiments of the present disclosure, the relaying for direct device-to-device communication may be implemented efficiently and flexibly.