Wireless Handover Timing Optimization for Data Interruption
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Solution Overview
Problem
In wireless communication systems, data interruption times occur during handovers due to disconnections between source and target base stations, and existing methods fail to effectively manage these interruptions, leading to potential handover failures and increased downtime.
Innovation Solution
A handover method that involves receiving a handover command, deciding on a precise time point for execution while maintaining connection to the source eNB, and executing the handover by disconnecting from the source eNB and connecting to the target eNB, with optional acknowledgement-based or immediate disconnection strategies, along with data forwarding requests to minimize interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE immediately disconnects from the source eNB upon receiving a handover command, then the handover execution time is reduced, but the reliability of data transmission deteriorates due to potential data loss during the disconnection period
Solution Approach 1:
The source eNB performs preliminary data forwarding to the target eNB before the UE disconnects from the source eNB. This preliminary action ensures that data is already available at the target eNB when the handover occurs, eliminating data loss while enabling immediate disconnection and reducing handover execution time.
Solution Approach 2:
The target eNB acts as an intermediary that receives and buffers data from the source eNB before the UE connects to it. This intermediary mechanism allows the source eNB to disconnect immediately while ensuring data continuity, as the target eNB already possesses the necessary data to transmit to the UE after handover.
2Reliability
If the UE maintains connection to the source eNB until handover is complete, then data transmission reliability is improved, but the data interruption time increases
Solution Approach 1:
The source eNB performs preliminary data forwarding to the target eNB before the actual handover execution. This ensures that when the UE switches connections, data is already available at the target eNB, maintaining reliability while minimizing the interruption period since the connection can be severed immediately after data forwarding begins.
Solution Approach 2:
Data forwarding between eNBs continues uninterrupted during the handover process. The source eNB maintains its connection with the UE while simultaneously forwarding data to the target eNB, ensuring continuous useful action in data transmission without requiring the UE to maintain the connection longer than necessary.
3Loss of substance
If the source eNB forwards data to the target eNB before handover, then data loss is prevented, but the system complexity increases due to additional data forwarding mechanisms
Solution Approach 1:
The existing data forwarding mechanism between eNBs is enhanced to serve dual purposes: routine data routing and handover-specific data preparation. This multi-functionality allows the same infrastructure to prevent data loss during handover without requiring separate dedicated data forwarding systems, thereby limiting the increase in system complexity.
Solution Approach 2:
The data forwarding operation is initiated in advance of handover using existing protocols and pathways. By utilizing pre-established data forwarding capabilities rather than creating new mechanisms, the system prevents data loss while minimizing the added complexity to the handover process.
Data Source
AI summary
A UE receives a handover command from a source eNB, and transmits a handover indication message to the source eNB while maintaining a connection to the source eNB. After transmitting the handover indication message, the UE disconnects the connection to the source eNB. Further, the UE accesses to a target eNB. A handover command includes information indicating timing advance if a handover without a random access procedure is configured.