Dual Active Stack Handover via UE Capability Exchange
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Solution Overview
Problem
Current wireless communication systems face challenges in handover procedures, particularly in maintaining seamless connectivity and reducing latency and failure rates during handovers in 5G NR and other multi-access technologies, which affects the reliability and efficiency of communication services.
Innovation Solution
The implementation of a method where User Equipment (UE) transmits its capability to both source and target base stations, allowing for dual active stack handovers with simultaneous communication using both stations' configurations, thereby maintaining connections and reducing latency and failure rates during handover execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedure is used, then handover process is simple, but connectivity reliability deteriorates and latency increases during handover execution
Solution Approach 1:
The UE performs capability indication beforehand to inform the source base station of its support for dual active stack handover. The source base station uses this information to prepare appropriate handover configuration messages that maintain dual connectivity during execution, ensuring reliability before the handover actually occurs.
Solution Approach 2:
The handover procedure dynamically adapts based on UE capability. When the UE indicates support for dual active stack handover, the system transitions to a more complex but reliable mode where both source and target base stations remain active during handover execution, rather than using a static simplified procedure.
2Loss of time
If dual active stack handover is implemented, then latency is reduced and reliability is improved, but system complexity increases
Solution Approach 1:
The capability indication is exchanged in advance during connection setup or reconfiguration phases, allowing the network to prepare dual active stack handover configurations before they are needed, reducing execution time and latency during actual handover events.
Solution Approach 2:
The system changes operational parameters based on capability indication. When dual active stack capability is detected, the handover procedure parameter changes to maintain both source and target base station connections simultaneously, optimizing performance for capable devices while keeping the system flexible for others.
3Productivity
If capability indication is transmitted, then handover optimization is enabled, but signaling overhead increases
Solution Approach 1:
The capability indication is merged with existing capability exchange procedures already present in the system. Rather than creating a separate dedicated signaling message, the capability information is incorporated into existing capability indication mechanisms, thereby enabling handover optimization without adding separate signaling overhead.
Data Source
AI summary
A UE transmits to a source base station a capability of the UE associated with a bandwidth class or a band combination. The capability is associated with a handover in which the UE maintains connections with the source base station and a target base station. The UE receives a handover message comprising at least one of a target base station configuration to apply during handover execution or a source base station configuration to apply during handover execution based on the capability of the UE. The UE establishes a connection with the target base station and maintains a connection with the source base station over a period of time during the handover. The UE communicates with the source base station and the target base station during handover execution using at least one of the target base station configuration or the source base station configuration.