Relay UE Lossless Data Delivery During Sidelink Path Switching
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Solution Overview
Problem
In wireless communication systems, especially in 5G networks, indirect path switching during sidelink user equipment to network relay often results in data loss due to poor link quality, as the relay UE cannot confirm successful delivery of data in the second hop, leading to inefficiencies in data delivery during handovers and path switching scenarios.
Innovation Solution
The implementation of a relay user equipment that stores acknowledged data before confirmation of delivery and provides an indication to the transmitting entity when data has not been confirmed by the receiving entity, allowing for proactive data forwarding or retransmission based on triggers such as radio link failure or buffered data thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect path switching is used for relay communication, then connectivity is established via relay UE, but data loss occurs due to inability to confirm successful delivery in the second hop
Solution Approach 1:
The relay UE performs preliminary actions by storing data in its buffer after successful reception from the first hop, before the second hop transmission is complete. This ensures data is preserved and can be forwarded even if the second hop fails, preventing data loss during path switching operations.
Solution Approach 2:
The patent implements feedback mechanisms where the relay UE provides status information about buffered data to the network. This feedback loop enables the network to track which data has been successfully received and stored, allowing for targeted retransmission attempts and improving overall data delivery reliability.
2Reliability
If the relay UE stores data before confirmation, then data delivery is ensured, but additional buffering and tracking mechanisms are required
Solution Approach 1:
The relay UE's buffer serves multiple functions: it stores data temporarily during path switching, provides a mechanism for data preservation, and enables the relay to confirm successful delivery. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The relay UE autonomously manages its own buffer state and provides self-generated feedback information about its buffering status to the network. This self-service capability eliminates the need for complex external monitoring and control mechanisms.
Data Source
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AI summary
Systems, methods, apparatuses, and computer program products for handling lossless data delivery during indirect path switching of sidelink based user equipment to network relay are provided. For example, a method can include relaying communication between a remote user equipment and an access network entity via a relay user equipment over a first and a second link between the relay user equipment and the access network entity. The method can also include storing data associated with the communication after acknowledging the reception of the data to a transmitting entity, and before receiving confirmation of delivery to a receiving entity. The method can further include detecting a trigger condition associated with the communication is met and providing an indication to the transmitting entity indicating that the data stored in the relay user equipment has been acknowledged to the transmitting entity but has not been confirmed by the receiving entity.