A method for reliable transmission of NDN interest packets in wireless scenarios

Abstract

The invention discloses a method for reliably transmitting NDN interest packets in a wireless scenario, which belongs to the technical field of communication. The present invention redefines the measurement of RTT as the basis for setting the overtime retransmission timer, starts the overtime retransmission timer after the downstream node forwards the interest packet, and the upstream node processes or forwards the interest packet after receiving the interest packet, and the downstream node Reply to the confirmation message to implement the Interest packet response mechanism. If the downstream node receives the acknowledgment message before the timeout retransmission timer expires, the downstream node will know the processing information of the upstream node for the Interest packet and the link status according to the acknowledgment message; If the downstream node does not receive the confirmation message, the downstream node decides whether to directly retransmit the Interest packet at the current node to increase the reliability of Interest packet transmission. The invention has the characteristics of accurate RTT measurement, low delay and high efficiency of directly retransmitting the interest packet at the packet loss point, and is suitable for wireless transmission environments with unstable links and high retransmission rate of the interest packet.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a reliable transmission method of an NDN interest packet in a wireless scene. Background technique [0002] ICN (Information-Centric Internet, Information Center Network) is a brand-new network architecture proposed in recent years. It is proposed to adapt to the content acquisition mode driven by the end-to-end communication mode driven by the sender to the content acquisition mode driven by the receiver. At the same time, it enhances the network's support for security, service quality, mobility, and scalability. [0003] NDN (Named Data Networking, Named Data Network) is a typical information center network, which replaces IP with named data and directly routes with content names. The message in NDN has two formats: Interest Packet (Interest Packet) and Data Packet (Data Packet). NDN adopts a communication mode driven by the requester, and the entire communi...

AI Technical Summary

Problems solved by technology

[0007] NDN has the following disadvantages in the wireless transmission environment: the wireless link is unstable and intermittent, resulting in a high rate of interest packet loss, and the requester retransmits interest packets frequently, resulting in high interest packet transmission delays. And the inaccurate measurement of the round-trip time RTT (Round Trip Time, RTT) between a pair of Interest / Data affects the efficiency of Interest packet transmission

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