TX UE Sidelink DRX Resource Mode Switching and Reporting
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a need for efficient resource allocation mode change and related information reporting between a TX UE and a BS in sidelink DRX, especially when transitioning from a state where the TX UE determines the resource allocation to a state where the BS takes over this determination.
Innovation Solution
The proposed solution involves an operation method and device for a TX UE that establishes a PC5 connection with an RX UE, determines the SL DRX configuration, and determines a resource for SL signal transmission. Based on a change in the resource allocation mode from TX UE-determined to BS-determined, the TX UE reports information related to the SL DRX configuration and assistant information to the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TX UE autonomously determines resource allocation mode and SL DRX configuration, then the system complexity at the BS is reduced, but the latency in adapting to changing communication conditions increases
Solution Approach 1:
The system dynamically transitions between two resource allocation modes (Mode 1 with BS control and Mode 2 with UE autonomous determination) based on communication conditions. The TX UE can switch between these modes and report the mode change and assistant information to the BS, enabling adaptive DRX configuration that balances complexity and latency requirements.
Solution Approach 2:
The TX UE provides feedback to the BS by reporting assistant information received from the RX UE and notifying of resource allocation mode changes. This feedback mechanism enables the BS to make informed decisions about DRX configuration while maintaining reduced latency through UE-initiated reports.
2Measurement precision
If the TX UE reports all SL DRX configuration information and assistant information to the BS, then the DRX configuration accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts and reports only the essential assistant information from the complete SL DRX configuration data. The TX UE identifies and reports key parameters that are most critical for BS decision-making, such as mode change notifications and essential assistant information, rather than transmitting all configuration details, thereby reducing signaling overhead while maintaining configuration accuracy.
3Productivity
If the system uses BS-determined resource allocation mode, then the resource allocation efficiency is improved, but the system flexibility and autonomy are reduced
Solution Approach 1:
The system implements dynamic mode switching between BS-determined (Mode 1) and UE-autonomous (Mode 2) resource allocation. The TX UE can autonomously switch modes based on communication conditions and report these changes to the BS, allowing the system to flexibly transition between centralized control (for efficiency) and decentralized autonomy (for adaptability) as needed.
Data Source
AI summary
An embodiment relates to an operation method of a sidelink DRX (Discontinuous Reception) related TX UE in a wireless communication system, including establishing PC5 connection with an RX UE by the TX UE, determining an SL DRX configuration of the RX UE by the TX UE, determining a resource for SL signal transmission to the RX UE by the TX UE, and transmitting an SL signal to the RX UE based on the resource by the TX UE, wherein based on a change from a state in which the TX UE determines the SL signal transmission resource to a state in which a BS is capable of determining the SL signal transmission resource, the TX UE reports information related to the SL DRX configuration and SL assistant information received from the RX UE to the BS.