Relay Node Handover Data Scheduling
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Solution Overview
Problem
Handovers from relay nodes to other access nodes in wireless networks consume additional network resources due to the need to transmit session data through the core network, potentially disrupting communication and affecting user experience.
Innovation Solution
Scheduling data packets prior to handover execution by transmitting remaining data in the buffer directly to the end-user wireless device, using the lowest-possible modulation coding scheme and ignoring channel quality indicator reports, to minimize data loss and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If session data is transmitted via the core network during handover from relay node to access node, then the handover process is completed, but network resource consumption increases and communication disruption risk increases
Solution Approach 1:
The patent transmits buffered session data to the wireless device before the handover is executed. By performing the data transmission in advance while the device is still connected to the relay node, the system eliminates the need to forward data through the core network after handover, thereby reducing network resource consumption and avoiding potential communication disruptions during the handover process.
2Reliability
If session data is transmitted through the core network during handover, then the destination access node receives the data, but the handover process becomes more complex with additional tunneling and signaling requirements
Solution Approach 1:
The patent extracts the data transmission function from the complex handover signaling path. Instead of routing session data through the core network with tunneling and signaling procedures, the system directly transmits the buffered data to the wireless device before handover, simplifying the overall process by removing unnecessary intermediate steps while ensuring data delivery.
3Speed
If handover is executed immediately when buffer is not empty, then handover latency is reduced, but data loss increases
Solution Approach 1:
The patent performs data transmission as a preliminary action before executing the handover. The source relay node transmits all buffered session data to the wireless device while the connection is still active, then executes the handover with minimal delay. This approach ensures no data loss while maintaining fast handover speed.
4Loss of information
If buffered data is transmitted before handover, then data loss is minimized, but the transmission process takes additional time
Solution Approach 1:
The patent utilizes the handover preparation period efficiently by transmitting buffered data during this time. The source relay node identifies when a handover is imminent and uses the preparation interval to transmit the buffered session data to the wireless device. This approach minimizes data loss while the actual handover execution remains fast, as the data transmission occurs in parallel with handover preparation rather than adding to execution time.
Data Source
AI summary
A relay node is enabled to transmit, to an end-user wireless device, any data packets remaining in a buffer associated with the end-user wireless device, prior to executing a handover of the end-user wireless device. Upon initiating a handover, the relay node adjusts a scheduling operation to use a lowest-possible modulating coding scheme (MCS) in order to transmit the remaining buffered data to the end-user wireless device. Moreover, the scheduling operation is adjusted to ignore any subsequent channel quality indicator (CQI) reports from the end-user wireless device, thereby ensuring that the end-user wireless device has a higher chance of receiving the data. When the buffer is empty, the handover is executed.