IAB Handover Packet Forwarding for Lossless Data Retransmission
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Solution Overview
Problem
In Integrated Access Backhaul (IAB) scenarios, data packet loss occurs during handover due to the interruption of data transmission, leading to unreceived and unprocessed packets, which affects the reliability of data transmission.
Innovation Solution
A method and apparatus for data packet transmission that involves a source donor node sending a handover request message to a target donor node, enabling the target donor node to forward retransmission data packets to the source donor node for processing, thereby improving data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is interrupted during handover process, then handover can be completed, but packet loss occurs and transmission reliability deteriorates
Solution Approach 1:
The source donor node performs preliminary actions by determining unacknowledged data packets before handover completion and proactively forwards them to the target donor node through the migrating IAB node. This ensures that packets potentially lost during handover are recovered, preventing packet loss and maintaining transmission reliability.
Solution Approach 2:
The target donor node acts as an intermediary to receive unacknowledged data packets from the source donor node and forward them to the UE. This intermediary mechanism ensures continuous data delivery during handover, preventing packet loss and maintaining reliability.
2Reliability
If unacknowledged data packets are forwarded to target donor node, then packet loss is prevented, but signaling overhead and processing complexity increase
Solution Approach 1:
The source donor node autonomously determines which data packets are unacknowledged and initiates the forwarding process itself without requiring external intervention. The target donor node automatically receives and forwards these packets based on pre-configured forwarding addresses, eliminating the need for complex coordination protocols and reducing processing complexity.
Data Source
AI summary
Provided are a data packet transmission method and apparatus, communication node and medium. The method includes transmitting a handover request message that includes information for a target donor node to forward data; and receiving retransmission data packets forwarded by the target donor node.