Sidelink DRX Alignment Using Sync Offsets for Inactive Reception
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Solution Overview
Problem
In sidelink communication systems, inefficient communication occurs when the discontinuous reception (DRX) operations for multiple receiving terminals are not aligned, leading to increased signaling overhead, resource inefficiency, and power consumption.
Innovation Solution
A method and apparatus for aligning DRX operations among multiple receiving terminals by transmitting DRX synchronization information, including a DRX cycle and time offset, through physical sidelink control channels, allowing synchronized DRX cycles and HARQ-ACK transmissions within inactive time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DRX operations for multiple receiving terminals are not aligned, then each terminal can independently manage its reception schedule, but signaling overhead increases and resource efficiency decreases
Solution Approach 1:
The patent merges the DRX operations of multiple receiving terminals by introducing a DRX operation start time offset that aligns the DRX cycles of all terminals relative to the transmitting terminal's DRX cycle. This synchronization ensures that all terminals enter and exit DRX states at coordinated times, reducing the need for continuous signaling and improving resource efficiency while maintaining independent terminal management capabilities
2Adaptability or versatility
If DRX operations for multiple receiving terminals are not aligned, then terminal autonomy is maintained, but resource efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic adjustability through the DRX operation start time offset parameter, which can be configured based on terminal capabilities and communication requirements. This allows the system to adapt between fully synchronized and more autonomous DRX operations, maintaining terminal versatility while improving resource efficiency through coordinated DRX cycles when needed
3Reliability
If DRX synchronization information is transmitted, then DRX alignment is achieved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by configuring the DRX operation start time offset in advance through higher layer signaling or system information before actual DRX operations begin. This pre-configuration approach ensures reliable DRX alignment is established beforehand, reducing the need for continuous synchronization signaling and thereby minimizing signaling overhead while maintaining alignment reliability
Data Source
AI summary
A method of a first terminal may comprise: receiving discontinuous reception (DRX) configuration information for a sidelink; performing a reception operation for a physical sidelink control channel (PSCCH) of a second terminal in an inactive time period indicated by the DRX configuration information; and obtaining sidelink control information (SCI) from the PSCCH.