Sidelink Resource Reselection Around SL DRX Active Time
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Solution Overview
Problem
In sidelink communication, resource allocation mode 2 by the transmitting UE may not consider the actual SL DRX active time of the receiving UE, leading to unnecessary signaling overhead and increased power consumption due to transmissions to UEs outside their active time.
Innovation Solution
The transmitting UE performs resource reselection when the PSCCH and PSSCH durations based on the sidelink grant and SCI are not within the SL DRX active time of the receiving UE, ensuring resources conform to the SL DRX operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmitting UE selects resources based on resource allocation mode 2 without considering the receiving UE's SL DRX active time, then resource selection flexibility is improved, but signaling overhead increases and power consumption increases due to transmissions to UEs outside their active time
Solution Approach 1:
The transmitting UE performs preliminary checks to determine whether the selected PSCCH and PSSCH resources fall within the receiving UE's SL DRX active time before transmission. This advance verification prevents unnecessary transmissions to UEs in inactive state, reducing power consumption while maintaining resource allocation flexibility
Solution Approach 2:
The system implements feedback mechanisms where the transmitting UE monitors whether received acknowledgments indicate successful delivery. When transmissions occur outside the receiving UE's active time, the lack of acknowledgment triggers resource reselection, creating a feedback loop that optimizes power consumption without sacrificing communication reliability
2Loss of energy
If the transmitting UE performs resource reselection to ensure resources conform to SL DRX active time, then power consumption is reduced, but device complexity increases due to additional monitoring and determination operations
Solution Approach 1:
The transmitting UE autonomously determines the receiving UE's SL DRX active time based on pre-configured parameters and performs self-service resource validation. By using locally available configuration information rather than requiring continuous network assistance, the system reduces power consumption while avoiding excessive complexity through self-contained decision-making
Solution Approach 2:
The system changes the operational parameters of resource selection by incorporating SL DRX active time constraints into the resource allocation process. This parameter modification allows the UE to adapt resource selection behavior dynamically, reducing power consumption through targeted transmissions while managing complexity through standardized parameter checks
3Speed
If transmissions are performed without verifying SL DRX active time alignment, then communication speed is maintained, but reliability decreases due to failed transmissions to UEs in inactive state
Solution Approach 1:
The transmitting UE quickly skips or rushes through the verification process by checking whether selected resources align with SL DRX active time using pre-configured parameters. This rapid verification maintains communication speed while ensuring transmissions occur only during the receiving UE's active period, thereby improving reliability without significant speed penalty
Data Source
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AI summary
A method for a first user equipment (UE) to perform sidelink communication in a wireless communication system according to an embodiment of the present disclosure, the method comprises creating a sidelink grant related to resource allocation mode 2, transmitting, to a second UE, the PSCCH and transmitting, to the second UE, the PSSCH. Based on 1) the second UE behaving based on a SideLink Discontinuous Reception (SL DRX) configuration, and 2) the at least one duration related to the PSCCH and a second stage SCI related to the PSSCH, for transmission of a Medium Access Control Protocol Data Unit (MAC PDU) which is based on the sidelink grant, not being in a SL DRX active time of the second UE: a reselection of the resource based on the resource allocation mode 2 is triggered.