Sidelink Positioning DRX Scheduling for Low-Latency Signal Reception
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Solution Overview
Problem
In sidelink positioning scenarios, the discontinuous reception (DRX) technology causes delays in receiving sidelink positioning reference signals (SL-PRS) and sidelink positioning protocol (SLPP) messages, leading to failure in meeting the quality of service (QoS) requirements due to the UE being in a dormant state during active periods.
Innovation Solution
A first time period is defined where the communication apparatus remains in an active state to receive positioning messages and signals, ensuring timely reception by adjusting the DRX cycle to meet the positioning service's delay requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE uses DRX technology to save power by entering dormant state, then power consumption is reduced, but the UE cannot receive positioning messages or SL-PRS in time, causing positioning delay to fail to meet requirements
Solution Approach 1:
The network device determines a first time period in advance before the UE needs to receive positioning messages or SL-PRS, and configures the UE to be in active state during this period. This preliminary action ensures the UE is awake and ready to receive positioning signals before they are actually transmitted, avoiding the delay that would occur if the UE had to wake up at the exact moment of signal transmission.
Solution Approach 2:
The solution dynamically adjusts the DRX configuration by introducing a first time period where the UE transitions from a standard DRX cycle to an active state specifically for positioning. This dynamic adjustment allows the system to optimize between power saving and positioning performance based on the specific positioning requirements, making the DRX behavior adaptive rather than static.
2Use of energy by stationary object
If the UE monitors PSCCH only in active time period in DRX cycle, then power consumption is reduced, but the UE cannot receive SL-PRS or SLPP message when in dormant state, affecting QoS of positioning service
Solution Approach 1:
The solution applies local quality by creating a specialized active period (first time period) with different characteristics from the regular DRX active time. During this first time period, the UE is guaranteed to be in active state specifically for positioning purposes, while maintaining normal DRX behavior for other communications. This localized adjustment ensures positioning reliability without compromising overall power saving performance.
Solution Approach 2:
The DRX cycle is segmented into different functional periods: the first time period dedicated to positioning (where UE is in active state), and the regular DRX cycles for general communication. This segmentation allows the system to optimize power consumption for general traffic while ensuring dedicated resources and active state for positioning operations, thereby maintaining both power efficiency and positioning QoS.
Data Source
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AI summary
This application provides a positioning method and an apparatus. The method includes: A first communication apparatus sends a first message, where the first message is used to request a second message from a second communication apparatus, and the second message is one or more of a positioning message and a positioning reference signal. The first communication apparatus receives the second message in a first time period, where the first time period includes a time period from sending the first message to receiving the second message, or the first time period includes a time period from a first moment to receiving the second message, and the first moment is a moment after the first communication apparatus sends the first message. The first communication apparatus is in DRX active time in the first time period. According to the method, the communication apparatus is in an active state in the first time period, so that the communication apparatus can receive a positioning message or a positioning reference signal in time, to meet a delay requirement of a positioning service.