PC5 Sidelink Relay Terminals for QoS-Preserving CAG Changes
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Solution Overview
Problem
Existing communication systems, particularly in 5G networks, lack a UE-initiated procedure for changing Closed Access Group (CAG) information, which can lead to dissatisfaction of predetermined Quality of Service (QoS) and challenges in supporting various services using sidelink communication, including low latency and resource efficiency.
Innovation Solution
A communication system where a communication terminal initiates a predefined process for changing CAG information, and a management device transmits the updated CAG information to the terminal, ensuring QoS is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE-initiated procedure for changing CAG information is not provided, then the network can maintain centralized control, but the Quality of Service cannot be satisfied and sidelink communication services cannot be supported
Solution Approach 1:
The network pre-configures CAG information and sidelink communication parameters in the UE before the UE needs to change CAG information. When the UE needs to change CAG information, it can do so using the pre-configured parameters without requiring complex real-time network interaction, thus satisfying QoS requirements while maintaining procedural simplicity.
Solution Approach 2:
The UE is enabled to autonomously change CAG information and initiate sidelink communication based on pre-configured network parameters. The UE can independently determine when to change CAG information and configure sidelink resources without continuous network control, improving QoS satisfaction while reducing procedure complexity.
2Ease of operation
If CAG information is changed without a predefined UE-initiated procedure, then network control is simplified, but resource utilization in sidelink communication deteriorates
Solution Approach 1:
The network performs preliminary configuration of CAG information, sidelink communication parameters, and resource allocation rules before the UE needs to change CAG information. This allows the UE to efficiently utilize resources when changing CAG information without requiring complex real-time network coordination, thus improving resource utilization while maintaining network control simplicity.
Solution Approach 2:
The system allows the UE to dynamically change CAG information and activate sidelink communication based on its own needs while operating within pre-configured network parameters. This dynamic capability improves resource utilization by allowing the UE to respond quickly to changing conditions without compromising network control simplicity.
3Reliability
If CAG information change procedure is not predefined, then automation extent is reduced, but communication quality cannot be enhanced
Solution Approach 1:
The network provides pre-configured CAG information, sidelink parameters, and automation rules to the UE before the UE needs to change CAG information. This preliminary configuration enables the UE to automatically and autonomously change CAG information and initiate sidelink communication with high communication quality without requiring complex real-time network automation, thus enhancing communication quality while maintaining appropriate automation levels.
Data Source
AI summary
A first communication terminal apparatus is provided in a communication system that includes a plurality of communication terminal apparatuses configured to perform sidelink communication via a PC5 interface, and a network including one or more core network nodes. The plurality of communication terminal apparatuses includes the first communication terminal apparatus and a second communication terminal apparatus. The one or more core network nodes includes a Session Management Function (SMF). The first communication terminal apparatus is a relay communication terminal apparatus that performs relay between the second communication terminal apparatus and the network. The first communication terminal apparatus is configured to establish a Protocol Data Unit (PDU) session between the first communication terminal apparatus and the network, the PDU session being used for the relay. The first communication terminal apparatus is configured to transmit information on the second communication terminal apparatus to the SMF.