Sidelink Resource Selection Aligning with SL DRX Active Times
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of New Radio V2X Release 16 and sidelink transmission in Release 17, existing power-saving mechanisms for terminal equipment do not ensure that receiving devices are in an active state during sidelink data transmission, leading to packet drops and reliability issues when using sidelink discontinuous reception (SL DRX).
Innovation Solution
A resource selection method and apparatus that generate and select candidate resource sets to ensure sidelink data transmission aligns with the SL DRX active times of receiving devices, using a generating unit to create sets of candidate resources within overlapped time periods and determining units to identify available resources for transmission, thereby ensuring the receiving device is active during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If SL DRX is configured for power saving, then power consumption is reduced, but packet drop rate increases due to receiving device being inactive during transmission
Solution Approach 1:
The transmitting device performs preliminary actions by determining the SL DRX active times of the receiving device before resource selection. The device calculates the selection window based on pre-configured parameters (drx-LongCycle, drx-StartOffset, drx-OnDurationTimer) to predict when the receiving device will be active, and uses this information to pre-determine appropriate transmission resources, ensuring the receiving device is awake when data is transmitted.
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the transmitting device to adjust its transmission strategy based on the receiving device's SL DRX configuration. The device dynamically determines the selection window and identifies suitable resources within the DRX active periods, enabling the system to adapt to the power-saving requirements while maintaining communication reliability through flexible resource allocation.
2Reliability
If resource selection is enhanced to align with SL DRX active times, then packet drop rate decreases, but device complexity increases
Solution Approach 1:
The patent segments the resource selection process into distinct manageable steps: (1) determining SL DRX active times based on configured parameters, (2) calculating the selection window based on active times and transmission timing requirements, and (3) identifying suitable resources within the selection window. This segmentation breaks down the complex task into sequential operations that can be implemented systematically.
Solution Approach 2:
The patent introduces an intermediary approach by using the concept of a 'selection window' as a mediator between the SL DRX configuration and the final resource selection. The selection window acts as an intermediate calculation that translates DRX parameters into actionable time ranges, simplifying the overall process by providing a clear boundary within which resources must be selected.
3Use of energy by moving object
If transmission resources are limited to SL DRX active times, then power saving is achieved, but transmission reliability decreases due to restricted resource availability
Solution Approach 1:
The patent applies partial action by selecting resources only within the SL DRX active times when the receiving device is actually needed, rather than attempting to transmit during all possible times. This partial resource selection aligns transmission opportunities with the receiving device's active periods, achieving power saving while maintaining reliability for those critical transmission moments.
Data Source
AI summary
A resource selection apparatus, configured in a first terminal equipment, the resource selection apparatus includes a transmitter configured to transmit sidelink data to a second terminal equipment, the second terminal equipment being configured with sidelink discontinuous reception (SL DRX), and processor circuitry configured to generate a first candidate resource set and a second candidate resource set, the first candidate resource set being a set of one or more candidate resources within an overlapped time period of a selection window of the first terminal equipment and at least one continuous SL DRX active time of the second terminal equipment during the selection window, the second candidate resource set being a set of all candidate resources within the selection window of the first terminal equipment, and determine candidate resources in the first candidate resource set available for sidelink data transmission to obtain a first candidate resource subset.