Sidelink Resource Selection for Power-Saving UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sidelink communication systems face challenges in power efficiency, particularly for user devices with limited battery life, such as pedestrian users, cyclists, and electric cars, due to the high power consumption of continuous sensing for resource selection in wireless communication networks.
Innovation Solution
Implementing a Discontinuous Reception (DRX) mode with a sensing process that includes a continuous partial sensing-based radio resource selection, where the UE autonomously selects resources and adapts the sensing window to reduce power consumption by performing partial sensing during the DRX OFF duration prior to the start of the DRX ON duration, and using a parameter to extend the default ON duration of the DRX cycle based on the sensing window mandated by the transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous sensing is performed for resource selection in sidelink communication, then resource selection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements Discontinuous Reception (DRX) cycles where the UE alternates between active periods (performing sensing) and sleep periods (not performing sensing). This periodic action allows the UE to maintain resource selection reliability during active periods while significantly reducing power consumption during sleep periods, directly resolving the contradiction between continuous sensing reliability and power consumption.
Solution Approach 2:
The patent performs sensing operations during the active period of the DRX cycle before the actual transmission occurs. By completing the sensing and resource selection in advance during the active period, the UE ensures reliable resource selection while avoiding the need for continuous sensing during the entire transmission timeline, thus reducing overall power consumption.
2Use of energy by moving object
If DRX mode is implemented to reduce power consumption, then power efficiency is improved, but sensing window coverage may be insufficient
Solution Approach 1:
The patent dynamically adjusts the DRX cycle parameters including the active period duration and sleep period duration based on communication requirements. The active period is configured to be sufficiently long to complete the mandatory sensing window operations, ensuring sensing coverage reliability. Meanwhile, the sleep period provides power savings. This dynamic configuration allows the system to adapt to different traffic patterns and reliability requirements.
Solution Approach 2:
The patent modifies DRX parameters such as the active period length, sleep period length, and DRX cycle timing to ensure that the sensing window fits within the active period. By carefully tuning these parameters, the system achieves both adequate sensing coverage (reliability) and sufficient power savings from the sleep period, resolving the contradiction between power efficiency and sensing coverage.
Data Source
AI summary
A user device, UE, for a wireless communication network is described. The wireless communication network including a plurality of user devices, UEs. The UE communicates with one or more further user devices, UEs, of the wireless communication network over a sidelink. Responsive to a trigger for a transmission, the UE performs a sensing process for determining resources to be used for the transmission. The sensing process includes a plurality of radio resource selection processes. The UE selects from the plurality of radio resource selection processes the radio resource selection process to be applied dependent on one or more of the following:a traffic density,a traffic density of different types of traffic,a user density within a predefined area around the UE.