PC5 Unicast Link Establishment via UE-to-UE Relay
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently establishing and managing direct communication links between User Equipments (UEs) in wireless communication systems, particularly in supporting Vehicle-to-Everything (V2X) services and Proximity-based services, where traditional methods lack effective authorization, QoS management, and relay mechanisms for UE-to-UE communication.
Innovation Solution
The method involves a UE transmitting a PC5-S message to establish a PC5 unicast link with a UE-to-UE Relay, which includes Layer-2 Identity of another UE, and receiving a response message from the Relay, enabling the establishment of a secure and efficient direct communication link through authorization and QoS configuration, with the Relay facilitating communication when direct UE connection is not feasible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional communication methods are used for UE-to-UE direct communication, then device complexity is reduced, but reliability and QoS management are insufficient
Solution Approach 1:
The patent introduces a relay UE as an intermediary entity to facilitate direct communication between UEs. The relay UE receives communication requests, manages link establishment, and coordinates QoS parameters, thereby improving reliability without requiring complex peer-to-peer negotiation between all UE pairs. The relay acts as a mediator that simplifies the overall system complexity while enhancing communication reliability.
Solution Approach 2:
The patent implements preliminary authorization and QoS configuration through PC5-S messages before actual data transmission begins. The direct communication request message includes pre-configured QoS parameters and authorization information, allowing the system to establish reliable communication links in advance with proper quality guarantees, rather than negotiating these parameters during active communication.
2Reliability
If direct UE connection is attempted, then communication efficiency is improved, but connectivity is not guaranteed when UEs are out of direct range
Solution Approach 1:
When direct UE connection is not feasible, the patent employs a relay UE as an intermediary to establish indirect communication paths. The relay UE forwards messages between UEs that are out of direct range, ensuring connection availability without requiring lengthy scanning or retry procedures. This mediator approach maintains reliability while avoiding excessive establishment time.
Solution Approach 2:
The patent implements dynamic link establishment by allowing UEs to switch between direct and relayed communication modes based on current connectivity conditions. The system dynamically selects the appropriate communication path (direct or via relay) and can transition between modes as network conditions change, ensuring continuous availability while minimizing establishment time.
3Reliability
If authorization and QoS configuration are implemented for PC5 unicast link, then communication security and quality are improved, but message exchange complexity increases
Solution Approach 1:
The patent merges authorization, QoS configuration, and link establishment into a single integrated PC5-S message exchange process. Rather than handling these as separate procedures, the direct communication request message combines multiple functions (authorization request, QoS parameter negotiation, link setup) into one unified message flow, reducing the number of separate message exchanges while maintaining comprehensive security and quality controls.
Solution Approach 2:
The PC5-S message structure is designed to be universal and multi-functional, capable of carrying authorization information, QoS parameters, and link establishment data in a single message format. This universal message structure handles multiple communication requirements simultaneously, reducing the need for specialized message types and simplifying the overall exchange process while maintaining security and quality guarantees.
Data Source
AI summary
A method and device are disclosed from the perspective of a first User Equipment (UE) to perform a PC5 unicast link establishment procedure. In one embodiment, the method includes the first UE transmitting a first PC5-S message for establishing a PC5 unicast link with a UE-to-UE Relay, wherein the PC5-S message includes a Layer-2 Identity (ID) of a second UE. The method further includes the first UE receiving a second PC5-S message from the UE-to-UE Relay, wherein the second PC5-S message is transmitted by the UE-to-UE Relay in response to reception of the first PC5-S message.