Source Cell Buffer Forwarding for Seamless Wireless Handover
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Solution Overview
Problem
In wireless networks, particularly during handovers, there is a challenge in managing data buffers to minimize data interruption time, as excessive data transfer to the target cell can lead to buffer depletion at the source cell, causing service interruptions, while insufficient transfer can result in increased latency and interruption times.
Innovation Solution
A method is implemented where the source cell estimates the data rate and determines the amount of data to forward to the target cell based on the scheduled handover time, ensuring that only the necessary data is transferred before the handover, and the target cell can immediately start transmitting data to the user device, thereby minimizing data interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If data is transferred from source cell to target cell before handover, then data interruption time is reduced, but source cell buffer may be depleted causing service interruption
Solution Approach 1:
The source cell performs preliminary data transfer to the target cell before the handover event occurs. By estimating the data rate and calculating the required data amount based on the scheduled handover time, the source cell proactively transfers necessary data to the target cell in advance, ensuring the target cell has sufficient buffered data to immediately continue service after handover, thus reducing data interruption time while preventing buffer depletion through controlled transfer amounts
Solution Approach 2:
The source cell continuously monitors buffer status and adjusts the data transfer amount dynamically. By estimating the data rate and comparing it with the scheduled handover time, the source cell calculates the precise amount of data needed for seamless handover and transfers only that amount, preventing both buffer depletion and excessive data transfer. This feedback mechanism ensures service continuity while minimizing data interruption time
2Loss of time
If data is transferred from source cell to target cell before handover, then latency is reduced, but excessive transfer can deplete source cell buffer
Solution Approach 1:
The source cell dynamically adjusts the data transfer parameters (data rate estimation, transfer amount calculation) based on the scheduled handover time and current buffer status. By changing these parameters adaptively, the system transfers the precise amount of data needed to reduce latency without depleting the source cell buffer, optimizing both timing and quantity aspects of data transfer
3Reliability
If insufficient data is transferred to target cell before handover, then source cell buffer is maintained, but data interruption time increases
Solution Approach 1:
The source cell performs preliminary data transfer to the target cell before handover by estimating the data rate and calculating the exact amount of data needed based on the scheduled handover time. This proactive approach ensures the target cell has sufficient buffered data to immediately continue service after handover, reducing data interruption time while maintaining source cell buffer status through controlled transfer amounts
Data Source
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AI summary
A technique includes making a decision to perform a handover of a user device from a source cell to a target cell at a scheduled handover time, determining, by a source base station associated with the source cell, an estimated data rate for transmitting data from the source cell to the user device between a time of the handover decision and the scheduled handover time, determining, based on the estimated data rate and a difference between the time of the handover decision and the scheduled handover time, a portion of data stored in a data buffer associated with the source cell for the user device to be forwarded to the target cell before the scheduled handover time, and forwarding, from the source cell to the target cell before the scheduled handover time, the portion of data stored in the data buffer for the user device.