Relay UE QoS Flow Establishment in 5G Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently establishing and managing Quality of Service (QoS) flows, particularly in next-generation networks like 5G, where end-to-end QoS requirements are complex and require precise handling to ensure reliable traffic transmission between user equipment and the network.
Innovation Solution
A method and device for Quality of Service (QoS) flow establishment from the perspective of a relay User Equipment (UE), which involves deriving and managing 5G QoS Identifiers (QI) to facilitate the setup and modification of QoS flows, ensuring end-to-end QoS requirements are met by transmitting appropriate QoS information between the relay UE, the network, and remote UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay UE establishes a PC5 unicast link with a remote UE and manages QoS flow establishment, then end-to-end QoS requirements can be met and traffic transmission reliability is enhanced, but the device complexity and signaling overhead increase due to deriving and translating multiple QoS identifiers (PQI, 5QI, QFI) across different network interfaces
Solution Approach 1:
The relay UE acts as an intermediary between the remote UE and the network, translating QoS identifiers across different interfaces. It derives the second PQI from the first PQI for PC5 interface communication, and translates between 5QI and QFI for network communication, thereby meeting end-to-end QoS requirements while managing the complexity at the relay node
Solution Approach 2:
The patent applies parameter transformation by converting QoS identifiers between different formats and namespaces. The relay UE transforms the first PQI (from remote UE) into a second PQI (for PC5 interface), and transforms between 5QI (5G QoS identifier) and QFI (QoS flow identifier) to match different interface requirements, enabling QoS flow establishment across heterogeneous interfaces
2Measurement precision
If the relay UE derives and translates multiple QoS identifiers to meet end-to-end QoS requirements, then QoS flow establishment accuracy is improved, but the processing time and signaling delay increase
Solution Approach 1:
The relay UE performs preliminary derivation of the second PQI from the first PQI before actual QoS flow establishment. By pre-processing the QoS identifier translation and preparing the appropriate identifiers in advance, the system reduces the time required during actual flow establishment while maintaining translation accuracy
Data Source
AI summary
A method and device for Quality of Service (QOS) flow establishment are disclosed. A relay User Equipment (UE) establishes a PC5 unicast link with a remote UE. The relay UE also receives an identity of a PC5 QoS flow and a first PC5 5G QoS Identifier (PQI) of the PC5 QoS flow from the remote UE for adding the PC5 QoS flow, wherein the first PQI indicates end-to-end QoS requirements of the PC5 QoS flow for traffic transmission between the remote UE and a network. The relay UE further derives a second PQI for the PC5 QoS flow and a 5QI for a QoS flow according to the first PQI. In addition, the relay UE transmits a Protocol Data Unit (PDU) Session Modification Request message to the network for adding the QoS flow, wherein the PDU Session Modification Request message includes an identity of the QoS flow and the 5QI.