User Equipment Handover with Simultaneous RRC Configurations
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving zero-millisecond data interruption during handovers, as existing handover mechanisms cause service interruptions due to disconnection from the source base station before connecting to the target base station.
Innovation Solution
The enhanced Make Before Break (MBB) handover method allows user equipment (UE) to maintain simultaneous connections with both the source and target base stations, applying Radio Resource Control (RRC) configurations to the target base station while maintaining configurations with the source base station, ensuring seamless handover without interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover mechanism is used, then handover procedure is simple, but service interruption occurs due to disconnection from source base station before connection to target base station
Solution Approach 1:
The patent applies preliminary action by preparing the target base station connection in advance before disconnecting from the source base station. The UE establishes RRC configuration with the target base station before breaking the link with the source base station, ensuring that the target connection is ready and waiting to take over seamlessly, thus eliminating service interruption.
Solution Approach 2:
The patent implements continuity of useful action by maintaining simultaneous connections with both source and target base stations during the handover process. The UE applies RRC configuration to the target base station while maintaining configurations with the source base station, ensuring continuous communication without interruption until the handover is complete.
2Loss of time
If enhanced MBB mechanism is applied, then handover interruption time is reduced, but complexity of maintaining simultaneous RRC configurations increases
Solution Approach 1:
The patent applies segmentation by dividing the RRC configuration into different parts: common configuration information and dedicated configuration information. The UE segments the handover process into applying common configuration first, then dedicated configuration, which simplifies the management of simultaneous RRC configurations for both source and target base stations.
Solution Approach 2:
The patent uses preliminary action by pre-configuring the target base station's RRC parameters before executing the handover. This includes preparing measurement configurations, mobility control information, and radio resource configurations in advance, so that when handover is triggered, the target connection is already ready and can be established immediately without time loss.
3Ease of manufacture
If all RRC configurations are applied to target base station immediately, then handover execution is simplified, but network resource allocation may be suboptimal
Solution Approach 1:
The patent segments RRC configurations into common configuration information (applicable to all bearers) and dedicated configuration information (specific to individual bearers). This segmentation allows the UE to apply common configurations immediately for quick handover execution, while deferred dedicated configurations can be applied selectively based on network resource availability and handover success, providing both simplicity and flexibility.
Solution Approach 2:
The patent applies partial action by selectively applying RRC configurations based on handover success. If handover is successful, all configurations including secondary cell additions and other configurations are applied. If handover fails, only the essential common configuration is applied, and dedicated configurations are discarded or adjusted, providing adaptability to network conditions.
Data Source
AI summary
The present disclosure provides a handover method performed by user equipment and user equipment. The handover method performed by user equipment (UE) comprises: receiving, by the UE, a handover command, the handover command instructing the UE to perform a handover from a source base station to a target base station with an enhanced handover mechanism; and applying, by the UE, to the target base station a Radio Resource Control (RRC) configuration comprised in the handover command, and maintaining an RRC configuration for the source base station at the same time, so as to perform the handover. In this way, the UE can communicate with the source base station and the target base station during the handover procedure, thereby implementing an enhanced handover mechanism, and reducing a handover interruption delay and a packet loss rate.