Relay Node PC5 QoS Adaptation for 5G Uplink
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Solution Overview
Problem
Current 5G communication systems lack effective end-to-end Quality of Service (QoS) support for uplink communication between User Equipment (UE) and the network via a relay node, particularly when Reflective QoS (RQoS) is applied, as the QoS on the Uu link impacts the PC5 link QoS in an unspecified manner, leading to incomplete e2e QoS.
Innovation Solution
A method and apparatus for a relay node to adapt PC5 QoS by modifying, using, or creating QoS flows based on the Uu link's QoS indicators, ensuring that the PC5 link QoS matches the Uu link's QoS changes, using configuration information to determine the appropriate QoS parameters and timers for maintaining derived QoS rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Reflective QoS (RQoS) is applied on the Uu link, then the QoS treatment for uplink packets is dynamically adjusted, but the QoS on the PC5 link becomes unspecified and inconsistent
Solution Approach 1:
The relay node receives QoS information from the network about the Uu link and uses this feedback to automatically adjust the PC5 link QoS parameters. The derived QoS rule is created based on network-provided QoS indicators, enabling the system to adapt to changing conditions while maintaining consistency across both links without requiring explicit reconfiguration.
Solution Approach 2:
The relay node acts as an intermediary between the Uu link and the PC5 link, translating QoS requirements from one link to the other. It receives QoS information from the network side and derives appropriate QoS rules for the sidelink, ensuring end-to-end QoS consistency through this intermediate translation process.
2Reliability
If the relay node dynamically adjusts PC5 QoS to match Uu link changes, then end-to-end QoS consistency is achieved, but the complexity of QoS management increases
Solution Approach 1:
The relay node autonomously creates and manages derived QoS rules based on received QoS information from the network. It automatically translates Uu link QoS requirements into PC5 link QoS parameters without requiring manual intervention or complex centralized management, reducing operational complexity while maintaining reliability.
Solution Approach 2:
The relay node modifies QoS parameters (such as packet delay budget, packet error rate, flow to bearer mapping) dynamically based on the received QoS indicators from the network. By changing these parameters locally at the relay node, the system achieves end-to-end consistency without requiring complex network-wide reconfiguration.
3Productivity
If explicit intervention from SMF is required for QoS adjustment, then QoS control is centralized, but the response time and system efficiency decrease
Solution Approach 1:
The relay node performs autonomous QoS translation and rule derivation locally without requiring continuous SMF intervention. It receives initial QoS indicators from the network and independently manages the derived QoS rules for PC5 link, significantly improving response efficiency and reducing dependency on centralized control for every QoS adjustment.
Data Source
AI summary
A method for supporting end-to-end (e2e) Quality of Service (QoS) for uplink (UL) communication between a User Equipment (UE) and a network via a relay node, the method performed by the relay node, are provided. The method includes receiving, from the network, a downlink (DL) packet for the UE, wherein the DL packet includes a value of a first indicator of a QoS flow on a first link between the relay node and the network, and creating or updating a QoS rule, wherein the QoS rule is derived based on the value of the first indicator, and optionally wherein the created or updated QoS rule corresponds to the UE or to a QoS flow on a second link with the UE.