Wireless Handover Control via Shared Configuration
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Solution Overview
Problem
Current handover control methods in wireless communication networks, especially in high frequency bands, face challenges such as increased network signaling load, latency, and reduced flexibility due to the need for extensive signaling between the wireless communication device (WCD) and the network node, particularly when switching between cells.
Innovation Solution
A handover control method is introduced that establishes a shared configuration between the WCD and the network node, including neighboring cell measurement and triggering criteria, allowing for channel quality measurements and handover decisions without additional signaling, leveraging shared transmission resource parameters and CSI-RS signals to facilitate seamless handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover control methods are used in high frequency bands, then handover decisions can be made based on channel quality measurements, but network signaling load increases and handover latency increases
Solution Approach 1:
The network node pre-configures the WCD with measurement configurations including CSI-RS resource parameters, reporting configurations, and handover triggering criteria before handover is needed. This preliminary setup eliminates the need for extensive signaling during the actual handover process, reducing latency while maintaining accurate handover decisions based on pre-established measurement frameworks.
Solution Approach 2:
Channel state information reference signals (CSI-RS) serve as an intermediary mechanism that enables the WCD to perform channel quality measurements and report findings to the network node. This intermediary signaling structure allows for efficient handover decision-making without requiring direct extensive communication between the WCD and network node during the handover execution phase.
2Reliability
If extensive signaling is used for handover control, then handover decisions can be made accurately, but network signaling load increases
Solution Approach 1:
The patent extracts and separates the measurement configuration and handover criterion establishment from the actual handover execution. The network node configures measurement parameters, reporting settings, and triggering criteria in advance, then only minimal signaling is required during handover to trigger and complete the transition. This extraction reduces network signaling load while preserving handover decision accuracy.
Solution Approach 2:
The WCD is empowered to autonomously perform channel quality measurements on CSI-RS resources and evaluate handover triggering criteria based on pre-configured parameters. The WCD self-generates measurement reports and determines when handover conditions are met, reducing the need for continuous network node intervention and signaling, thereby lowering network signaling load while maintaining accurate handover decisions.
Data Source
AI summary
A handover control method is disclosed for a wireless communication device connected to a serving network node which provides a serving cell. The method comprises establishing a handover control configuration, shared by the WCD and the SNWN, comprising a neighboring cell measurement triggering criterion, a handover triggering criterion, and transmission resource parameters for measurement signals of a neighboring cell. The method also comprises performing channel quality measurements of the serving cell and detecting fulfillment of the neighboring cell measurement triggering criterion based on the channel quality measurements of the serving cell. The method also comprises performing channel quality measurements of the neighboring cell and detecting fulfillment of the handover triggering criterion based on the channel quality measurements of the neighboring cell.