Wireless Handover Optimization via Direct UE Count Transfer
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE protocols, handover processes between nodes can cause service interruptions due to the transfer of uplink and downlink count values, leading to delays and potential loss of data units during the handover from a source node to a target node, as the target node may not receive these values in time, resulting in undesirable service interruptions and data loss.
Innovation Solution
The method involves the source node continuing to schedule and forward UE data to the target node during the handover process, with the target node receiving UL and DL count information directly from the UE, ensuring continuous data transmission and reception by allowing the source node to maintain data scheduling until the handover is complete, thereby minimizing service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the source node stops scheduling UE data to transfer UL and DL counts to the target node, then the count transfer can be completed accurately, but service interruption occurs while the UE waits for the counts
Solution Approach 1:
The source node performs preliminary actions by continuing to schedule and forward UE data during the handover process, before the target node has fully received and processed the UL and DL counts. This ensures data transmission continuity while the count transfer is completed in the background.
Solution Approach 2:
The source node maintains continuous data scheduling and forwarding operations throughout the handover process. Instead of stopping to transfer counts, the source node keeps the useful action of data transmission continuous, using parallel processes to transfer counts while maintaining data flow.
2Reliability
If the source node transfers UL and DL counts via MME using S1AP protocol, then the count transfer can be performed, but additional time and network resources are consumed
Solution Approach 1:
The patent uses the UE as an intermediary to receive and provide UL and DL count information to the target node. Instead of having the source node directly transfer counts through the MME, the UE acts as a mediator that receives counts from the source node and forwards them to the target node, enabling parallel operations.
Solution Approach 2:
The target node performs preliminary actions by requesting UL and DL count information from the UE before fully initiating the handover data reception process. This allows the count transfer to be prepared in advance, reducing the overall handover time.
3Speed
If the UE connects to the target node before the target node receives UL and DL counts from the source node, then connection establishment is faster, but data transmission cannot occur until counts are received
Solution Approach 1:
The UE performs preliminary actions by establishing connection with the target node before the count transfer is complete. The UE waits for the reconfiguration message from the source node, then establishes the connection and begins transmitting data, using the target node's resources in advance.
Solution Approach 2:
The UE maintains continuous data transmission capability by establishing the connection with the target node before the count transfer completes. The useful action of data transmission continues once the UE has the necessary count information, without waiting for the entire handover process to finish.
4Reliability
If the source node forwards all scheduled UE data to the target node during handover, then data loss is prevented, but network bandwidth is consumed
Solution Approach 1:
The source node performs preliminary actions by identifying and forwarding only the necessary scheduled UE data during the handover process. Instead of forwarding all possible data, the source node uses the reconfiguration message to indicate which data needs to be forwarded, reducing unnecessary bandwidth consumption.
Solution Approach 2:
The source node extracts and forwards only the essential scheduled UE data that needs to be transferred during handover, rather than transferring all data. This selective forwarding approach prevents data loss while minimizing network bandwidth usage.
Data Source
AI summary
Aspects of the present invention relate to improved systems and methods for handing over a UE from a source node to a target node. In some embodiments, the target node receives UL and DL count information directly from the UE being handed over, rather than from the source node or from a core network node.