DAPS Handover Data Forwarding With Predictive Timing Windows
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Solution Overview
Problem
Existing data forwarding methods in wireless communications, particularly during dual active protocol stack (DAPS) handover, are inefficient and lack precise timing predictions, leading to suboptimal performance and resource utilization.
Innovation Solution
Implementing a method where a wireless transmit/receive unit (WTRU) determines prediction points for a data forwarding window and sends a measurement report to a network entity, receiving feedback for refined timing points based on the window, enhancing data forwarding precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional data forwarding methods are used during DAPS handover, then the handover process can be completed, but the data forwarding efficiency is low and resource utilization is suboptimal due to lack of precise timing predictions
Solution Approach 1:
The WTRU performs preliminary actions by determining the data forwarding window (DFW) based on predicted timing points (first point and second point) before the actual handover occurs. This allows the network entity to prepare data forwarding in advance within the predicted window, improving efficiency without waiting for handover completion. The preliminary timing prediction enables proactive resource allocation and data preparation.
Solution Approach 2:
The network entity provides feedback by sending a feedback message containing refined timing information (third point or fourth point) based on the WTRU's initial measurement report. This feedback loop allows the system to iteratively improve timing prediction accuracy, where the network entity's response refines the DFW estimation, resolving the contradiction between initial prediction and final precision.
2Manufacturing precision
If timing prediction points are determined and measurement reports are sent, then data forwarding precision is improved, but additional signaling overhead and processing steps are introduced
Solution Approach 1:
The measurement report mechanism is enhanced to serve multiple functions: it carries both traditional measurement data and the new timing prediction information (first point and second point for DFW determination). This multi-functionality allows the existing signaling framework to accommodate precision improvement requirements without requiring entirely separate signaling channels, thereby limiting the increase in complexity.
3Loss of energy
If the data forwarding window is defined by predicted points, then resource utilization is optimized, but the reliability of data forwarding may be compromised due to prediction errors
Solution Approach 1:
The system incorporates a cushioning mechanism by establishing the DFW based on predicted timing points with built-in margins. The network entity uses the predicted first and second points to define a window that accommodates potential variations, and further refines this window using feedback from the third or fourth points. This beforehand cushioning protects against prediction errors while maintaining optimized resource utilization within the buffered window.
Data Source
AI summary
Methods, apparatuses, and procedures for enhancements to data forwarding for dual active protocol stack handover in wireless communications are disclosed. In an example, a method implemented by a wireless transmit/receive unit for wireless communications includes determining a first point and a second point for time prediction, and a data forwarding window is defined by the first point and the second point. The method also includes sending, to a network entity, a measurement report including the first point and the second point, and receiving a feedback message including information indicating at least one of a third point or a fourth point for time prediction. At least one of the third point or the fourth point is generated based on the data forwarding window.