DRX-Aware Resource Sensing for NR V2X Transmission Success
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Solution Overview
Problem
In New Radio (NR) V2X mode, user equipment (UE) does not account for the impact of Discontinuous Reception (DRX) when acquiring time-frequency resources, leading to incomplete information and potential transmission failures due to incompleteness of sensed information.
Innovation Solution
A method for wireless communications that involves receiving information to determine an active time in a time resource pool, sensing target signaling in a time resource sub-pool, and transmitting a radio signal in a time-frequency resource block, where the resource pool is chosen between a first candidate pool and a second candidate pool based on the length of the time resource sub-pool to ensure complete information and successful transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If UE performs sensing in all time-frequency resources without considering DRX, then resource acquisition completeness is improved, but power consumption increases and standby time decreases
Solution Approach 1:
The time resource pool is segmented into active time and inactive time based on DRX configuration. The UE performs sensing only during active time periods, dividing the continuous sensing task into discrete intervals that align with DRX cycles, thereby reducing power consumption while maintaining essential sensing functionality.
Solution Approach 2:
The sensing behavior is made dynamic by adapting to DRX states. The UE dynamically adjusts its sensing activity according to whether it is in active or inactive DRX period, transitioning between sensing and sleep states to optimize the trade-off between information completeness and power consumption.
2Use of energy by moving object
If UE performs sensing only during active time in DRX, then power consumption is reduced, but sensing information completeness deteriorates
Solution Approach 1:
The UE performs preliminary sensing actions during active time to acquire resource allocation information in advance. By sensing resource pool configurations, reserved resources, and channel conditions during active periods, the UE prepares transmission parameters beforehand, eliminating the need for continuous sensing during inactive periods while maintaining information completeness.
Solution Approach 2:
The system uses feedback mechanisms where the UE reports sensed information and resource requirements to the network during active time. The network provides feedback regarding resource allocation and DRX configuration, enabling the UE to make informed decisions about transmission resources without continuous sensing, thus reducing power consumption while maintaining information accuracy.
3Device complexity
If UE uses current sensing mechanism without DRX consideration, then resource allocation simplicity is maintained, but transmission success rate deteriorates due to incomplete information
Solution Approach 1:
The sensing mechanism is enhanced to serve multiple functions: it not only detects resource availability but also captures DRX configuration information, resource pool parameters, and channel conditions during active time. This multi-functional sensing approach maintains algorithmic simplicity while improving transmission success rate by providing comprehensive information for resource selection.
Solution Approach 2:
The sensing mechanism incorporates DRX-related parameters such as active time duration, DRX cycle length, and resource pool timing offsets. By changing the sensing parameters to align with DRX configurations, the UE can accurately identify available resources during active periods without increasing algorithmic complexity, thereby improving transmission reliability.
Data Source
AI summary
The present disclosure provides a method and a device in wireless communications for Discontinuous Reception (DRX). A first node receives first information, the first information used for determining an Active Time in a first time resource pool; and senses a target signaling in a first time resource sub-pool; and transmits a first radio signal in a first time-frequency resource block, the first time-frequency resource block belonging to a first resource pool, the first resource pool being either one of a first candidate resource pool and a second candidate resource pool; the first time resource sub-pool belongs to the Active Time in the first time resource pool. The present disclosure takes into account the influence of DRX over the time-frequency resource selection in sidelink transmissions, thereby improving success rate of transmission.