Sidelink Radio Bearer Release via PC5 QoS Flow Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink radio bearers, particularly in releasing resources effectively in next-generation networks like 5G, which is essential for supporting advanced services such as Vehicle-to-Everything (V2X) communications.
Innovation Solution
A method and apparatus are developed where a User Equipment (UE) transmits specific RRC messages to network nodes to request and release sidelink radio bearers, utilizing PC5 QoS flows and their identifiers to manage resource allocation and configuration dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink radio bearers are configured with detailed PC5 QoS flow mappings, then service quality for V2X communications is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the sidelink radio bearer configuration by introducing separate lists for active PC5 QoS flows (first list) and released PC5 QoS flows (second list). This segmentation allows the network to manage QoS flow mappings in a structured manner, improving service quality while maintaining manageable device complexity through organized resource tracking.
Solution Approach 2:
The patent implements preliminary action by maintaining a list of released PC5 QoS flows before they are fully removed. This allows the network to prepare for resource release and reallocation in advance, ensuring smooth transitions and reducing the complexity of managing active connections while maintaining service quality.
2Productivity
If sidelink resources are released promptly when PC5 QoS flows are deactivated, then resource utilization efficiency is improved, but the risk of service interruption increases
Solution Approach 1:
The patent applies preliminary action by adding deactivated PC5 QoS flows to a release list before actual resource release. This allows the system to prepare for resource reallocation while maintaining service continuity during the transition period, balancing resource utilization efficiency with service reliability.
Solution Approach 2:
The patent implements feedback mechanisms through RRC messaging between the network and UE, where the network can confirm resource release and reallocation. This feedback loop ensures that resources are released only when appropriate, maintaining service reliability while improving overall resource utilization efficiency through coordinated management.
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a first UE (User Equipment) to indicate a network node for releasing SLRB (Sidelink Radio Bearer) or SL-DRB (Sidelink-Data Radio Bearer). In one embodiment, the method includes transmitting a first RRC (Radio Resource Control) message to a network node for requesting sidelink resource, wherein the first RRC message includes a PFI (PC5 QoS Flow Identifier) of a PC5 QoS (Quality of Service) flow in a first list of PC5 QoS flows. The method also includes receiving a second RRC message from the network node, wherein the second RRC message configures a SLRB and maps the PC5 QoS flow to the SLRB. The method further includes transmitting a third RRC message to the network node if the PC5 QoS flow is deactivated or released, wherein the PFI of the PC5 QoS flow is removed from a second list of PC5 QoS flows included in the third RRC message.