Dual-Connectivity Handover With Parallel Secondary Cell Addition
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handovers for user equipment (UE) with dual connectivity to primary and secondary base stations, particularly in improving mobility and cell management.
Innovation Solution
The UE is configured to perform a handover procedure to a secondary base station in parallel with an addition procedure, where the start time of the addition procedure occurs before the end time of the handover procedure, allowing simultaneous execution of both processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential handover and addition procedures are performed, then procedure reliability is improved, but handover time increases
Solution Approach 1:
The UE performs the addition procedure for the secondary base station in advance before completing the handover procedure to the second primary base station. By initiating the addition procedure earlier (at time T1) rather than waiting for handover completion (time T2), the UE prepares the secondary connectivity path beforehand, reducing the total time required for establishing dual connectivity while maintaining procedural reliability through proper sequencing of random access procedures.
2Productivity
If parallel handover and addition procedures are performed, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent segments the handover and addition procedures into distinct time phases with clear boundaries. The addition procedure starts at time T1 while handover is ongoing, and completes at time T3 before handover finishes at T2. This temporal segmentation allows parallel execution of both procedures with manageable complexity, as the UE handles random access to the secondary base station (addition procedure) and random access to the primary base station (handover procedure) as separate, coordinated tasks rather than intertwined operations.
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing techniques for a user equipment (UE) having dual connectivity. The UE can communicate with a first primary base station in a first primary cell (PCell) and a second primary base station in a second PCell. The UE has dual connectivity in the second PCell using a first wireless carrier to communicate with the second primary base station and a second wireless carrier to communicate with a secondary base station in a primary secondary cell (PSCell). The UE receives a message from the first primary base station to perform a handover procedure. The UE performs the handover procedure according to the received message, and further perform an addition procedure for the secondary base station in parallel with the handover procedure. A start time of the addition procedure can be before an end time of the handover procedure.