NDN (Named Data Networking) interest packet reliable transmission method in wireless scene

Abstract

The invention discloses an NDN (Named Data Networking) interest packet reliable transmission method in a wireless scene and belongs to the technical field of communication. According to the method, redefinition of measurement of RTT (Round Trip Time) is taken as the basis of setting a timeout retransmission timer, after a downstream node forwards an interest packet, the timeout retransmission timer is started, and after an upstream node receives the interest packet, the upstream node processes or forwards the interest packet and replies an acknowledgement message to the downstream node, so aninterest packet response mechanism is realized. If the downstream node receives the acknowledgement message before the timeout retransmission timer expires, the downstream node learns processing information of the upstream node for the interest packet and link condition according to the acknowledgement message; and if the downstream node does not receive the acknowledgement message before the timeout retransmission timer expires due to a link fault, the downstream node decides whether the directly transmit the interest packet at a current node or not, so transmission reliability of the interest packet is improved. The method is characterized by that accurate RTT measurement, and low delay and high efficiency because that the interest packet is directly retransmitted at a packet loss position. The method is applicable to a wireless transmission environment in which a link is instable and an interest packet retransmission rate is high.

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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