Handover Control Method for Mobile Communication Terminals
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Solution Overview
Problem
Current mobile communication systems experience service interruption delays during handover processes due to frequent handovers between small-cell eNBs, leading to user inconvenience and suboptimal communication quality.
Innovation Solution
A method and device for controlling handover by maintaining the connection between User Equipment (UE) and the source eNB until a first signal is transmitted to the target eNB, using a handover request message and Radio Resource Control (RRC) connection reconfiguration to minimize service interruption delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If handover is performed frequently between small-cell eNBs, then communication capacity and coverage are improved, but service interruption delay increases
Solution Approach 1:
The source eNB transmits a handover request message to the target eNB before the UE actually needs to handover, allowing the target eNB to prepare resources in advance. This preliminary action reduces the service interruption delay when handover occurs frequently between small-cell eNBs while maintaining high communication capacity.
Solution Approach 2:
The source eNB maintains the connection with the UE and continues data transmission/reception until the UE successfully transmits a first signal to the target eNB. This continuous action ensures seamless communication during handover, eliminating service interruption delays even when handovers are frequent.
2Reliability
If handover is performed to maintain connection in mobile environments, then communication continuity is improved, but handover process interrupts connection
Solution Approach 1:
The source eNB maintains the connection with the UE and continues data transmission/reception operations until the UE successfully transmits a first signal to the target eNB. This ensures communication continuity is preserved during the handover process itself, eliminating the connection interruption that normally occurs during handover.
Solution Approach 2:
The handover request message is transmitted to the target eNB in advance, and the target eNB prepares the handover environment before the actual handover executes. This preliminary preparation allows the connection to be maintained with the source eNB throughout the process, ensuring communication continuity without interruption.
3Loss of time
If connection is maintained with source eNB during handover, then service delay is reduced, but device complexity increases
Solution Approach 1:
The handover request message serves as an intermediary mechanism between the source eNB and target eNB, coordinating the handover process while maintaining UE connection. This structured intermediary approach reduces service delay through coordinated action while managing device complexity through standardized messaging protocols.
Data Source
AI summary
Provided are a control method for decreasing a service interruption delay in a handover procedure of a mobile communication terminal, and a device therefor. The method of a source base station may include: transmitting, to a target base station, a handover request message including information indicating an improved handover mode for decreasing service interruption when handover of a terminal is determined; receiving a handover request confirmation message including the information indicating the improved handover mode from the target base station; transmitting a radio resource control (RRC) connection reestablishment message including mobility control information to the terminal; and maintaining connection to the UE and continually transmitting data to or receiving data from the terminal through the connection until the terminal transmits a first signal to a target cell of the target base station according to the improved handover mode.