Conditional PSCell Change Using Sensor-Based Mobility Prediction
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Solution Overview
Problem
Existing 5G-New Radio (NR) systems face challenges in efficiently managing beam failure and optimizing secondary cell group (PSCell) changes, particularly in mmWave frequency bands, due to limited availability of sub-6 GHz frequency ranges and the need for proactive non-radio measurements to enhance mobility and coverage.
Innovation Solution
The implementation of proactive non-radio measurements based conditional PSCell change (CPC) procedures, where a wireless transmit/receive unit (WTRU) sends assistance information including position, location, and sensor data to determine suitable cells and beams, and receives configuration information for conditional PSCell changes, using random access channel parameters and sensor data for mobility decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional radio measurement-based PSCell change procedures are used, then beam failure detection and recovery can be achieved, but the system lacks proactive capability and cannot predict future beam failures before they occur
Solution Approach 1:
The patent applies preliminary action by performing non-radio measurements (geographic coordinates, zone determination, candidate cell identification) before beam failure occurs. The WTRU proactively determines its location and identifies candidate cells based on predicted mobility patterns, allowing the system to prepare recovery mechanisms in advance rather than reacting after failure occurs.
Solution Approach 2:
The patent implements feedback through the measurement report mechanism where the WTRU reports non-radio measurements (position, location, zone) back to the network. This feedback loop enables the network to adjust CPC configuration dynamically based on actual WTRU location and mobility patterns, improving the accuracy of proactive beam failure prediction.
2Reliability
If proactive non-radio measurements are implemented, then future beam failures can be predicted and prepared for, but the device complexity increases due to additional measurement and processing requirements
Solution Approach 1:
The patent replaces complex radio measurement-based beam failure detection with simpler non-radio measurements (geographic coordinates, zone identification). Instead of continuously monitoring radio signal quality for failure detection, the system uses location-based predictions to identify at-risk beams, substituting a simpler measurement mechanism for a more complex one.
Solution Approach 2:
The patent segments the proactive CPC procedure into distinct functional steps: (1) WTRU determines geographic coordinates and zone based on non-radio measurements, (2) WTRU identifies candidate cells and beams from mobility configuration, (3) WTRU reports measurements to network, (4) Network executes CPC based on reported information. This segmentation reduces overall complexity by breaking down the complex prediction task into manageable modules.
3Productivity
If conditional PSCell change procedures are executed based on link quality thresholds, then mobility optimization can be achieved, but the system cannot handle scenarios where no suitable candidate cells are available
Solution Approach 1:
The patent applies beforehand cushioning by having the WTRU pre-identify and report multiple candidate cells and beams before actual PSCell change is needed. The network receives advance information about available candidates and can prepare execution plans in advance, ensuring that when beam failure occurs, suitable replacement cells are already identified and ready for immediate deployment.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may send assistance information to a network element. The assistance information may indicate that the WTRU can use sensor data for mobility. The WTRU may receive conditional PSCell change (CPC) configuration information, for example from the network element. The CPC configuration information may include one or more of a CPC candidate for device mobility, a CPC candidate for external mobility, and/or a trigger for performing CPC based on the assistance information. The WTRU may perform a CPC, for example based on a cell quality of a serving cell being below a threshold. The WTRU may determine whether to use the CPC candidate for device mobility and/or the CPC candidate for external mobility based on the sensor data and the trigger, for example to perform the CPC.