Conditional Handover Execution Signaling in Wireless Networks
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Solution Overview
Problem
Current radio access network architectures face challenges in efficiently managing radio resources and handovers, leading to increased radio resource utilization and communication overhead, particularly during conditional handovers, which degrades network reliability and efficiency.
Innovation Solution
Implementing enhanced signaling procedures and information exchange mechanisms between base stations and wireless devices to enable timely handover execution, allowing the source base station to suspend downlink packets when the wireless device completes the handover to the target cell, and using measurement reports to determine optimal handover conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover procedures are implemented in radio access networks, then handover execution reliability is improved, but radio resource utilization increases and communication overhead increases
Solution Approach 1:
The source base station suspends downlink packet transmission to the wireless device in advance before handover completion is confirmed. This preliminary action prevents radio resource wastage by stopping data transmission to a device that is in the process of handover, while avoiding data loss by resuming transmission after handover completion is verified.
Solution Approach 2:
The target base station provides feedback to the source base station regarding handover completion status. This feedback mechanism enables the source base station to make informed decisions about resuming downlink packet transmission, ensuring reliable handover execution while optimizing radio resource utilization by transmitting data only when the device is successfully connected to the target cell.
2Loss of time
If enhanced signaling procedures are used for handover management, then handover execution timing is improved, but communication overhead increases
Solution Approach 1:
The patent extracts and separates the handover completion notification function from general data transmission protocols. By dedicating specific signaling messages for handover status notification, the system achieves timely handover execution without burdening the communication overhead with redundant information, as the signaling is purpose-built and optimized for this specific function.
3Loss of energy
If downlink packets are suspended during handover, then radio resource wastage is reduced, but data forwarding delays increase
Solution Approach 1:
The downlink packet transmission status is dynamically adjusted based on real-time handover progression. The system transitions from active transmission to suspended transmission when handover is detected, and back to active transmission when handover completion is confirmed. This dynamic adaptation minimizes both radio resource wastage and data forwarding delays by precisely matching transmission behavior to device connectivity status.
Data Source
AI summary
A wireless device receives, from a first base station, an indication of a conditional handover towards a cell, wherein the indication comprises a cell identifier of the cell and at least one handover execution condition. The wireless device transmits, to the first base station and based on the wireless device determining that the at least one handover execution condition is met by the cell, a notification indicating that the wireless device executes the conditional handover towards the cell.