Handover Data Transfer Management in Radio Networks
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Solution Overview
Problem
In wireless communications, the handover process between base stations leads to unnecessary duplicate transmission of user data, wasting radio resources and reducing data transmission rates due to inadequate exchange of status information between the network and mobile terminals.
Innovation Solution
Implementing a handover procedure that includes exchanging data reception status information between the mobile terminal and the network, allowing the target base station to confirm successful data transfer and minimizing redundant transmissions by only re-transmitting unacknowledged data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal accesses a second node after accessing a first node, then the network can maintain connectivity during handover, but unnecessary duplicate transmission of data occurs and transmission delays increase due to inadequate status information exchange
Solution Approach 1:
The source base station performs preliminary actions by determining which data packets have been successfully received by the mobile terminal before handover occurs. It identifies unacknowledged data and transfers only that specific information to the target base station, preventing the target from retransmitting already received data and avoiding duplicate transmissions that would waste radio resources
Solution Approach 2:
The system implements feedback mechanisms where the mobile terminal sends acknowledgment information back to the source base station regarding received data packets. This feedback loop allows the source base station to identify which data needs to be transferred to the target base station, ensuring that only unacknowledged data is retransmitted during handover, thereby improving transmission efficiency
2Reliability
If the source base station transfers all data to the target base station during handover, then data continuity is maintained, but radio resources are wasted due to redundant transmission of already received data
Solution Approach 1:
The source base station extracts only the necessary information - specifically the status of unacknowledged data packets - and transfers it to the target base station during handover. This selective extraction avoids transferring data that has already been successfully received, thereby preventing radio resource waste while maintaining data continuity
Solution Approach 2:
The system changes the parameter of data transfer by transitioning from transferring all data to transferring only unacknowledged data. This parameter change is achieved through tracking acknowledgment status and using this information to determine the scope of data transfer, optimizing radio resource utilization
3Reliability
If the network re-transmits data during handover, then data delivery reliability is improved, but transmission delays increase and data transmission rates decrease
Solution Approach 1:
The source base station performs preliminary identification of unacknowledged data before handover, determining exactly which packets need retransmission. This preliminary action allows the target base station to immediately retransmit only the necessary data after handover, avoiding delays associated with transmitting all data or waiting for acknowledgment cycles
Data Source
AI summary
A mobile communications system including a network with a source network node and a target network node that supports a handover procedure, and a mobile terminal that is allowed to access the source network node and access the target network node according to the handover procedure, in which information related to a reception status of user data is delivered between at least two among a group including the mobile terminal, the source network node, and the target network node such that the target network node may receive status information from the source network node and the target network node may receive a status report from the mobile terminal.