Service Session Handover Data Truncation
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Solution Overview
Problem
The transfer of service sessions between service nodes in wireless networks is often time-consuming and can cause delays and interruptions, compromising user experience and increasing the risk of handover failure due to significant data traffic and buffering delays.
Innovation Solution
A method where the source service node truncates unacknowledged application data based on a buffer indicator, transferring only the truncated data and the indicator to the target service node, allowing the target node to recreate the application buffer using pending downlink data from the new base station, thereby reducing the amount of data to be transferred and minimizing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source service node transfers all application data in the application buffer to the target service node, then the target service node can reconstruct the complete application buffer, but the data transfer volume increases significantly causing delays and handover failures
Solution Approach 1:
The patent extracts only the essential information (buffer indicator) from the complete application buffer and transfers it to the target service node. The buffer indicator contains metadata that enables the target node to reconstruct the application buffer locally using its own buffer, avoiding the need to transfer the entire data set while ensuring handover reliability.
Solution Approach 2:
The patent segments the application buffer into two parts: (1) the buffer indicator containing essential metadata that is transferred to the target service node, and (2) the actual application data that remains in the source node's buffer or is handled locally. This segmentation allows the target node to reconstruct the buffer without receiving all original data, reducing transfer time and improving handover reliability.
2Reliability
If the source service node transfers all application data to the target service node, then the target service node can reconstruct the application buffer, but the network load increases significantly
Solution Approach 1:
The patent extracts only the buffer indicator from the application buffer and transfers it to the target service node. This buffer indicator contains sufficient information for the target node to reconstruct the application buffer using data already present in its own buffer, dramatically reducing the quantity of data transferred while maintaining service session continuity.
Solution Approach 2:
Instead of transferring the original application data, the patent enables the target service node to create a copy of the application buffer locally using the buffer indicator and data from its own buffer. This copying approach maintains service continuity while minimizing network data transfer volume.
3Reliability
If the source service node waits for acknowledgements before transferring data, then data integrity is ensured, but the handover process is delayed
Solution Approach 1:
The patent performs preliminary actions by transferring the buffer indicator before completing the full data transfer or waiting for all acknowledgements. The target service node uses this buffer indicator to proactively reconstruct the application buffer, ensuring data integrity while avoiding delays associated with waiting for complete acknowledgement of all data packets.
Solution Approach 2:
The buffer indicator acts as feedback information that enables the target service node to verify and reconstruct the application buffer without requiring complete feedback loops for all data packets. This feedback mechanism ensures data integrity while accelerating the handover process by eliminating unnecessary waiting periods.
Data Source
AI summary
Source and target service nodes and methods are described for transferring a service session for a wireless device from the source node to the target node when a service application is executed in the source node for the wireless device by the service session. In particular, the amount of application data to be transferred from the source node to the target node for a wireless device that is handed over from a first base station to a second base station can be reduced by truncating the application data by an amount corresponding to the data pending in a downlink buffer at the first base station. Thereby, the target node is able to recreate the complete application buffer from the truncated application data and data from the downlink buffer, the latter data being transferred from the first base station (206) to the second base station (208), according to a handover procedure.