UE-to-Network Relay QoS Handling in PC5 Unicast Links
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Solution Overview
Problem
Current wireless communication systems face challenges in establishing efficient one-to-one connections between User Equipment (UE) in Evolved Universal Terrestrial Radio Access Network (E-UTRAN) for providing high data throughput and supporting advanced services like voice over IP and multimedia, particularly in scenarios involving UE-to-Network relay communications.
Innovation Solution
The method involves a first UE initiating a procedure to establish a one-to-one connection with a second UE, transmitting a PC5-S message for security context establishment, which includes Quality of Service (QoS) information only when necessary, and using specific Layer-2 IDs for communication, adhering to 3GPP standards for PC5 unicast link establishment and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If QoS information is included in PC5-S message for UE-to-Network relay communication, then service quality is improved, but message complexity and overhead increase
Solution Approach 1:
The patent extracts QoS information from the PC5-S message specifically for UE-to-Network relay communication scenarios. By identifying that relay communications have different QoS requirements compared to direct UE communications, the invention removes the QoS indication field from PC5-S messages in relay scenarios, reducing message complexity while maintaining appropriate service quality through alternative QoS management mechanisms in the network layer.
2Reliability
If one-to-one connection establishment procedure is implemented for UE-to-Network relay, then communication reliability is improved, but connection setup time increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing security contexts and connection parameters between UEs before actual data transmission begins. The PC5-S message exchange for security context establishment is performed in advance, allowing the relay connection to be quickly activated when needed, thus reducing the effective connection setup time while maintaining reliable communication.
Data Source
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AI summary
Methods and a device are disclosed from the perspective of a first User Equipment (300), UE, to establish one-to-one connection between the first UE and a second UE. In one embodiment, the method includes the first UE initiating a first procedure of establishing the one-to-one connection with the second UE for a unicast communication between the first UE and the second UE or for a UE-to-UE communication between the first UE and a third UE via the second UE or a second procedure of establishing the one-to-one connection with the second UE for a UE-to-Network communication between the first UE and a network node via the second UE (2905). The method also includes the first UE transmitting a first PC5-S message to the second UE for completing establishment of a first security context in the first procedure of establishing the one-to-one connection with the second UE for the unicast communication or the UE-to-UE communication if the first procedure is initiated, wherein the first PC5-S message includes Quality of Service, QoS, information for the unicast communication or the UE-to-UE communication (2910). The method further includes the first UE transmitting a second PC5-S message to the second UE for completing establishment of a second security context in the second procedure of establishing the one-to-one connection with the second UE for the UE-to-Network communication if the second procedure is initiated, wherein the second PC5-S message does not include any QoS information for the UE-to-Network communication (2915).