Wireless Handover Using Dual Connectivity for Zero Interruption
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Solution Overview
Problem
Current handover techniques in wireless communications systems often result in connectivity interruptions and inefficiencies, particularly when a user equipment (UE) transitions between base stations, leading to potential radio link failures and suboptimal channel conditions.
Innovation Solution
The implementation of advanced handover methods that allow a UE to maintain a primary connection while establishing a secondary connection with a new base station using dual connectivity or make-before-break techniques, enabling zero or almost zero millisecond handovers and adaptive role switching based on channel measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional handover techniques are used where UE releases connection with source base station before establishing connection with target base station, then handover speed is improved, but connectivity reliability deteriorates causing interruptions and radio link failures
Solution Approach 1:
The patent implements make-before-break handover where the UE establishes a second connection with the target base station before releasing the first connection with the source base station. This preliminary establishment of the target connection ensures that connectivity is already in place before the source connection is terminated, thereby maintaining reliability while achieving fast handover. The UE maintains dual connectivity during the transition period, preventing any service interruption.
Solution Approach 2:
The patent ensures continuous connectivity by maintaining both the first connection with the source base station and the second connection with the target base station simultaneously during handover. The UE does not interrupt its communication activities and continues to exchange data through both connections until the target connection is fully established and validated, thus eliminating connectivity gaps and ensuring uninterrupted service.
2Reliability
If UE establishes second connection with target base station before releasing first connection with source base station, then connectivity reliability is improved, but handover time increases
Solution Approach 1:
The patent performs preliminary actions by establishing the second connection with the target base station while the first connection is still active. This allows the target connection to be prepared in advance with all necessary signaling and resource allocation completed before the source connection is released, minimizing the actual handover execution time while ensuring reliability.
Solution Approach 2:
The patent dynamically manages the transition between connections by allowing flexible switching between first and second connections based on real-time conditions. The UE can perform measurements, evaluate connection quality, and switch roles between source and target connections dynamically, optimizing the handover process to minimize time loss while maintaining reliability through adaptive connection management.
3Adaptability or versatility
If UE performs measurements and role switching during handover, then handover adaptability is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE continuously performs measurements on both source and target base stations and reports channel conditions back to the network. Based on this feedback, the system dynamically adjusts handover parameters, determines optimal switching timing, and makes informed decisions about connection management. This feedback-driven approach enables adaptive handover while keeping complexity manageable through automated decision-making algorithms.
Solution Approach 2:
The patent enables the UE to autonomously perform measurements, evaluate connection quality, and make self-directed decisions about when to switch connections without requiring constant network intervention. The UE independently monitors channel conditions, performs necessary measurements, and triggers handover actions based on predefined criteria, reducing the signaling overhead and simplifying the overall system complexity while maintaining high adaptability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide a handover may be performed based on one or more conditions at a UE and in conjunction with a handover procedure from a source base station to a target base station. The one or more conditions at the UE may be associated with successful establishment or maintenance of the second connection. In some cases, the one or more conditions at the UE may correspond to one or more measurements associated with the source base station, the target base station, one or more neighboring base stations, or any combinations thereof.