Conditional PSCell Addition Beam Filtering for NR-DC
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Solution Overview
Problem
In NR-DC setups, user equipment (UE) faces high processing and power consumption due to evaluating all conditional PSCell addition and change (CPAC) conditions, even though it eventually executes handover to only one PSCell, rendering other evaluations futile.
Innovation Solution
Implementing a mechanism where the source and target network elements provide condition information and configurations to the UE, allowing it to selectively evaluate CPAC conditions based on criteria such as beam measurements, thereby shortlisting PSCells for evaluation, reducing unnecessary processing and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE evaluates all CPAC conditions for all PSCells, then the handover execution reliability is improved, but the UE processing consumption and power consumption increase
Solution Approach 1:
The patent segments the CPAC condition evaluation process by dividing PSCells into two groups: those associated with beams meeting the criterion (first group) and those not meeting the criterion (second group). The UE is instructed to evaluate CPAC conditions only for PSCells in the first group, while skipping evaluations for PSCells in the second group. This segmentation reduces unnecessary processing and power consumption while maintaining handover reliability for the most promising candidates.
Solution Approach 2:
Instead of requiring complete evaluation of all CPAC conditions for all PSCells, the patent applies partial action by limiting evaluations to only those PSCells associated with beams that fulfill the specified criterion. This partial evaluation approach reduces processing overhead while still ensuring reliable handover execution for the most suitable PSCells.
2Reliability
If the UE evaluates all CPAC conditions for all PSCells, then the handover execution reliability is improved, but the processing time increases
Solution Approach 1:
The patent segments the CPAC condition evaluation process by dividing PSCells into two groups: those associated with beams meeting the criterion (first group) and those not meeting the criterion (second group). The UE is instructed to evaluate CPAC conditions only for PSCells in the first group, while skipping evaluations for PSCells in the second group. This segmentation reduces unnecessary processing and power consumption while maintaining handover reliability for the most promising candidates.
Solution Approach 2:
The patent enables the UE to skip the CPAC condition evaluation step for PSCells associated with beams that do not fulfill the specified criterion. By skipping these futile evaluations, the processing time is reduced without compromising handover reliability, as the skipped PSCells are unlikely to be optimal handover targets.
3Adaptability or versatility
If multiple CHO preparations with different CPAC preparations are provided, then the adaptability for different handover scenarios is improved, but the UE processing complexity increases
Solution Approach 1:
The patent segments the CPAC condition evaluation process by dividing PSCells into two groups: those associated with beams meeting the criterion (first group) and those not meeting the criterion (second group). The UE is instructed to evaluate CPAC conditions only for PSCells in the first group, while skipping evaluations for PSCells in the second group. This segmentation reduces unnecessary processing and power consumption while maintaining handover reliability for the most promising candidates.
Solution Approach 2:
The network performs preliminary action by providing beam association information and criteria before the UE executes CPAC condition evaluations. This advance preparation enables the UE to efficiently identify which PSCells require evaluation, reducing processing complexity during the actual handover execution while maintaining adaptability for different scenarios.
Data Source
AI summary
Described herein is a source network element configured for supporting a conditional mobility procedure in a dual connectivity (DC) setup involving at least one target network element and a user equipment, UE, served by a first primary cell (PCell) of the source network element, the target network element being associated with a second PCell and a plurality of primary secondary cells (PSCells) for supporting a conditional PSCell addition and change (CPAC) procedure, the source network element comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the source network element at least to: receive, from the target network element, respective CPAC condition configurations for the plurality of PSCells; obtain condition information indicative of at least one criterion for one or more beams associated with respective PSCells, wherein the at least one criterion is for facilitating determination of at least one PSCell that is associated with a beam fulfilling the criterion from the plurality of PSCells; and transmit the CPAC condition configurations and the condition information indicative of the criterion to the UE for evaluation of the respective CPAC condition of the at least one PSCell.