User Equipment Handover with Enhanced Make Before Break
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Solution Overview
Problem
Current mobile communication systems face challenges in minimizing handover interruption time during the transition from one base station to another, particularly in 5G communication systems, where data transmission and reception are interrupted, leading to delays.
Innovation Solution
The implementation of an enhanced Make Before Break (eMBB) technique, where a user equipment (UE) with a dual RX/TX chain maintains data transmission and reception with both the source and target base stations, allowing for seamless handover by reporting eMBB support and using mobilityControlInfo to configure handover operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional handover procedure is used, then handover process is simple, but data transmission and reception are interrupted causing delays
Solution Approach 1:
The UE establishes a connection with the target base station before breaking the connection with the source base station. The UE performs random access to the target base station and receives handover configuration information while still maintaining connection with the source base station, thereby preparing the handover in advance and avoiding service interruption.
Solution Approach 2:
The UE maintains continuous data transmission and reception with the source base station during the handover preparation phase. The source base station continues to serve the UE until the handover is fully executed, ensuring uninterrupted service and minimizing handover interruption time.
2Reliability
If UE maintains connection with source base station during handover, then data transmission continuity is improved, but connection management complexity increases
Solution Approach 1:
The UE reports eMBB capability information to the source base station, and the source base station provides feedback by configuring appropriate handover parameters including mobilityControlInfo. This feedback mechanism enables the network to optimize the handover process based on UE capabilities, managing dual connections efficiently.
Solution Approach 2:
The handover configuration includes specific parameters such as mobilityControlInfo that control the behavior during handover. By adjusting these parameters based on UE eMBB capability, the system optimizes the dual connection management and ensures smooth transition while maintaining data transmission continuity.
Data Source
AI summary
An operating method performed by a user equipment (UE) in a wireless communication system according to some embodiments of the present disclosure may include: generating a source link for transmitting and receiving data to and from a source base station; receiving, from the source base station, a radio resource control (RRC) message including configuration information for handover to a target base station; starting a timer, in response to the reception of the RRC message; transmitting, to the target base station, a message for handover to the target base station while the timer is running; and determining, in a case where the handover to the target base station fails up until the timer expires, whether to trigger RRC re-establishment, based on a state of the source link.