Sidelink RLF Declaration Without Continuous Data Transmission
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in declaring sidelink radio link failure (RLF) when there is no data to be transmitted, leading to inefficient resource management and reduced use efficiency due to the inability to perform sidelink radio link monitoring (RLM) without continuous data transmission.
Innovation Solution
A method where a transmitting user equipment (TX UE) transmits sidelink control information (SCI) and predetermined data to trigger feedback from a receiving UE, allowing the TX UE to declare sidelink RLF based on feedback, even in the absence of data transmission, by configuring the HARQ feedback report option to be enabled or disabled as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous data transmission is maintained to enable sidelink RLM/RLF performance, then reliability of link monitoring is improved, but resource allocation efficiency deteriorates due to unnecessary resource occupation when no data needs to be transmitted
Solution Approach 1:
The transmitting UE sends predetermined data in advance when there is no actual data to transmit, specifically to trigger HARQ feedback from the receiving UE. This preliminary action enables the transmitting UE to perform sidelink RLM/RLF based on the received feedback, thereby maintaining link monitoring reliability without requiring continuous actual data transmission, thus avoiding unnecessary resource occupation.
Solution Approach 2:
The system uses the receiving UE's own HARQ feedback mechanism to serve the transmitting UE's link monitoring needs. By configuring the HARQ feedback report option to be enabled, the receiving UE automatically provides feedback that the transmitting UE can utilize for RLM/RLF determination, eliminating the need for separate dedicated monitoring signals or continuous data transmission.
2Productivity
If predetermined data is transmitted to trigger feedback for RLF declaration, then resource allocation efficiency is improved by avoiding continuous transmission, but device complexity increases due to additional configuration and feedback handling mechanisms
Solution Approach 1:
The HARQ feedback mechanism, originally designed for data transmission acknowledgment, is made multi-functional by configuring it to also serve sidelink RLM/RLF purposes. When the HARQ feedback report option is enabled, the same feedback channel and processing logic are used both for acknowledging predetermined data and for providing link quality information, thereby avoiding the need for separate dedicated monitoring feedback mechanisms and reducing overall system complexity.
Data Source
AI summary
A method for operating a transmitting user equipment (TX UE) in a wireless communication system, according to one embodiment, comprises: a step in which the TX UE transmits sidelink control information (SCI); a step in which the TX UE transmits predetermined data in a resource region associated with the SCI; and a step in which, on the basis of feedback of a receiving (RX) UE which has received the data, the TX UE determines declaration of a sidelink radio link failure (RLF), wherein the predetermined data is transmitted on the basis of there being no data for the TX UE to transmit to the RX UE, and the predetermined data is associated with a trigger of the feedback.