Network Handover Packet Status Exchange for URLLC Continuity
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Solution Overview
Problem
Existing communication systems face challenges in maintaining ultra-reliable and low-latency communication (URLLC) services, particularly in avoiding service interruptions at the application layer due to network layer errors, which are not addressed by current survival time mechanisms.
Innovation Solution
The proposed solution involves a communication method where network devices exchange auxiliary information about data packet transmission status, allowing the target network device to improve transmission reliability and avoid service interruptions by determining which data packets are not allowed to fail, based on survival time and transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target network device waits for data packets to arrive before determining transmission status, then the device can process complete data sets, but service interruption occurs at the application layer due to handover delays
Solution Approach 1:
The source network device performs preliminary actions by determining and forwarding auxiliary information about data packet transmission status to the target network device before the handover is complete. This allows the target device to immediately access transmission status information without waiting for data packets to arrive, preventing service interruption at the application layer.
Solution Approach 2:
The source network device acts as an intermediary by extracting and forwarding auxiliary information (transmission status of data packets) to the target network device. This intermediary action enables the target device to obtain critical transmission status information without directly receiving complete data packets from the terminal, resolving the timing conflict during handover.
2Reliability
If the target network device improves transmission reliability by checking all data packets, then transmission accuracy increases, but processing time increases during handover
Solution Approach 1:
The source network device extracts only the essential auxiliary information (transmission status of data packets) from the complete data set and forwards it to the target network device. This extraction allows the target device to determine transmission reliability without receiving or processing all actual data packets, significantly reducing processing time during handover while maintaining transmission reliability.
Solution Approach 2:
Instead of requiring complete data packet reception and verification, the system performs partial action by using only the auxiliary transmission status information. This partial approach is sufficient to determine whether data packets are allowed to be unsuccessfully transmitted, achieving the required reliability without the excessive time cost of complete verification.
3Reliability
If the system requires complete data packet reception before service continuation, then data integrity is ensured, but service interruption occurs during handover
Solution Approach 1:
The source network device performs preliminary action by determining and forwarding auxiliary information about data packet transmission status before the handover process completes. This preliminary provision of transmission status information enables the target network device to immediately assess data integrity requirements without waiting for complete data packet reception, ensuring both data integrity and service continuity during handover.
Data Source
AI summary
A target network device of a terminal device receives N data packets of a first service and auxiliary information from a source network device, where the auxiliary information indicates a transmission status of at least one data packet before the N data packets; and the target network device determines the transmission status of the at least one data packet.