Conditional Handover Configuration for Carrier Aggregation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing mobility enhancements for conditional handovers and carrier aggregation, particularly in ensuring optimal execution conditions based on beam-based measurements.
Innovation Solution
The implementation of a user equipment (UE) that receives configuration information for a conditional handover from a source base station, including execution conditions based on beam-based or cell-based measurements, and transmits a message to initiate the handover when these conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover configuration includes carrier aggregation configurations for candidate base stations, then the likelihood of successful carrier aggregation during handover is improved, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring carrier aggregation configurations for candidate base stations before handover execution. The source base station provides configuration information including SCell configurations to the UE in advance, so that when handover is triggered, the UE can immediately execute the handover with carrier aggregation already configured, avoiding the need to reconfigure during handover and thus improving success rate while managing complexity through advance preparation
Solution Approach 2:
The patent segments the handover configuration into multiple independent parts: execution conditions (beam-based or cell-based measurements), candidate base station configurations, and carrier aggregation configurations (including SCell configurations). This segmentation allows the UE to process and evaluate each component separately, making the overall complex configuration more manageable and enabling selective application of configurations based on measured conditions
2Measurement precision
If beam-based measurements are used for execution conditions, then the precision of handover decision is improved, but the measurement and detection difficulty increases
Solution Approach 1:
The patent segments measurement evaluation into beam-level measurements and cell-level measurements. The UE can evaluate execution conditions based on beam-based measurements (which provide higher precision for beam selection) or cell-based measurements (which are simpler to implement). This segmentation allows the system to choose the appropriate measurement granularity based on deployment scenarios, improving precision when needed while providing a simpler alternative when measurement complexity is a concern
Solution Approach 2:
The patent allows the UE to perform beam-based measurements on a partial set of candidate beams or candidate base stations rather than all possible beams. The execution condition can be satisfied by measuring only the necessary subset of beams that are most likely to meet the handover criteria, reducing the overall measurement burden while maintaining sufficient precision for accurate handover decisions
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a source base station, configuration information for a conditional handover, where the configuration information indicates an execution condition and one or more carrier aggregation configurations associated with one or more candidate base stations, and where the execution condition is based at least in part on at least one of a beam-based measurement or a cell-based measurement and at least one of special cells or secondary cells (SCells) associated with the one or more candidate base stations. The UE may transmit, to a candidate base station of the one or more candidate base stations, a message to initiate the conditional handover based at least in part on the execution condition having been satisfied. Numerous other aspects are described.