Relay UE PC5 Connection Suspension for 5G Re-registration
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Solution Overview
Problem
In 5G mobile communication systems, the re-registration of relay UE can cause temporary interruptions in data/signaling transmission to remote UEs, leading to user experience degradation due to sudden disconnection and delayed reconnection.
Innovation Solution
The proposed method involves the relay UE suspending its PC5 connection with remote UEs, informing them of the interruption, and resuming the connection after successful re-registration, allowing remote UEs to buffer data/signaling and reconnect when the relay UE is available, minimizing service disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE performs re-registration to the network, then network connectivity and communication reliability are improved, but PC5 connection with remote UE is interrupted causing service disruption
Solution Approach 1:
The relay UE performs re-registration to the network before the PC5 connection with remote UE is actually needed, ensuring network connectivity is established in advance. This preliminary action prevents service disruption by having the relay UE already registered and ready to provide service when remote UE needs communication.
Solution Approach 2:
The relay UE maintains continuous PC5 connection with remote UE during the re-registration process by using a background thread to handle the re-registration in the background. This allows the useful action of relaying communication to continue without interruption while the relay UE re-registers with the network.
2Duration of action of stationary object
If relay UE maintains PC5 connection during re-registration, then service continuity is improved, but network registration fails due to resource conflicts
Solution Approach 1:
The relay UE suspends the PC5 connection with remote UE before performing re-registration to the network. This preliminary suspension prevents resource conflicts during re-registration while ensuring that the connection can be resumed afterward, maintaining both registration success and service continuity.
Solution Approach 2:
The relay UE uses a suspension mechanism as an intermediary state between active PC5 connection and re-registration. By suspending rather than completely terminating the connection, the relay UE preserves connection context while allowing re-registration to proceed, enabling seamless resumption afterward.
3Reliability
If relay UE suspends PC5 connection before re-registration, then registration success is improved, but data transmission interruption occurs
Solution Approach 1:
The relay UE maintains continuous data transmission capability during suspension by using a background thread to handle PC5 connection management. This allows data transmission to continue without interruption even while the relay UE is suspended for re-registration, preventing information loss.
Solution Approach 2:
The relay UE automatically manages the suspension and resumption of PC5 connection without external intervention. The system self-services by detecting when re-registration is needed, suspending the connection, performing re-registration, and then resuming the connection, all without requiring manual control or external coordination.
4Loss of time
If relay UE quickly resumes PC5 connection after re-registration, then service recovery is improved, but connection stability decreases due to rushed reconnection
Solution Approach 1:
The relay UE performs preliminary checks and preparations before resuming the PC5 connection with remote UE after re-registration. This includes verifying network connectivity, ensuring resources are available, and confirming connection parameters are correct, which stabilizes the connection before resumption.
Solution Approach 2:
The relay UE uses feedback mechanisms to monitor the status of both network connection and PC5 connection during the resume process. By continuously checking connection quality and adjusting parameters based on feedback, the relay UE ensures stable reconnection rather than rushed reconnection.
Data Source
AI summary
One embodiment of the present specification relates to a method by which a relay UE performs communication, comprising the steps of: receiving, from an access and mobility management function (AMF), a UE configuration update command message including information for requesting registration of the relay UE; transmitting, to a remote UE, a message indicating suspension of a PC5 connection; receiving, from the remote UE, a message indicating that the PC5 connection has been completely suspended; transmitting, to the AMF, a UE configuration update complete message in response to the UE configuration update command message; performing a registration procedure with the AMF; and resuming the PC5 connection with the remote UE.