Relay Node Monitoring in GBN-ARQ Data Retransmission
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Solution Overview
Problem
The existing GBN-ARQ technology has a low success ratio for data packet retransmission, especially in relay cooperation communication systems, as it does not effectively utilize relay nodes for monitoring and decoding, leading to inefficient channel utilization and retransmission processes.
Innovation Solution
A data retransmission method and system where a relay node monitors and decodes data packets sent in GBN-ARQ mode, stores successfully decoded packets, and sends copies of packets corresponding to NACK messages, improving the success ratio of data retransmission by participating in the data transmission process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GBN-ARQ technology is used for data packet retransmission, then channel utilization is improved compared to SW-ARQ, but the success ratio of data packet retransmission remains relatively low when relay cooperation is not utilized
Solution Approach 1:
The patent introduces a relay node as an intermediary between the source node and destination node. The relay node monitors data packets transmitted in GBN-ARQ mode, decodes them, and stores copies of successfully decoded packets. When the destination node returns a NACK for a data packet, the relay node can send a copy of that packet to the destination node, thereby improving the success ratio of retransmission by utilizing the relay cooperation mechanism.
2Reliability
If relay node monitors and decodes each data packet in GBN-ARQ mode, then success ratio of retransmission is improved, but system complexity increases due to additional monitoring and decoding operations
Solution Approach 1:
The relay node is designed to perform multiple functions: it monitors data packets transmitted by the source node, decodes the monitored packets, stores copies of successfully decoded packets, and sends copies to the destination node when needed. This multi-functionality allows the system to improve retransmission success ratio while keeping the added complexity manageable by consolidating these operations in a single relay node rather than distributing them across multiple components.
Data Source
AI summary
A data retransmission method, apparatus, and system can improve a success ratio of data packet retransmission. A data retransmission method includes: after a source node continuously transmits at least two data packets to a destination node according to a go-back-N automatic repeat request, monitoring and decoding, by a relay node, the at least two data packets; storing a copy of a successfully decoded data packet; monitoring a response message to each data packet, where the response message is returned by the destination node to the source node; and sending a copy of a data packet that corresponds to a reception negative acknowledgment message to the destination node, when the monitored response message is the reception negative acknowledgment message.