Reliable mobility RPL routing method based on link energy saving

Abstract

The invention provides a reliable mobile RPL routing method based on link energy saving, and belongs to the technical field of wireless sensor network communication. The whole communication process is divided into three stages: a detection and transmission stage, a reaction and prediction stage and an announcement stage. The method comprises the following three innovative mechanisms: modifying a control message frame format, selecting a father node by combining priorities, and setting a reachable timer; modifying a control message frame format in combination with different interaction scenes, so the backward compatibility of a control message is ensured, and meanwhile, the additional overhead caused by adding an additional control message is avoided; based on multiple metric values and in combination with priority selection PPN, considering the network depth and the upstream link energy of the alternative father node, so the energy consumption of part of SN can be avoided, and the survival time of the whole network is effectively prolonged; and finally, enabling a part of CPNs to start a reachable timer after receiving the DAO, and considering the condition of forwarding the DAO or DAO-ACK loss, so the link construction failure caused by the loss of the control message is effectively avoided, and the transmission efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor network communication, and is mainly aimed at the Low Power and Lossy Networks (LLN) routing protocol (Routing Protocol for LLN, RPL) in a random mobile scene, in order to select the optimal parent node and To avoid the failure of link construction caused by the loss of forwarding control messages, a reliable mobility RPL routing method based on link energy saving is proposed. Background technique [0002] In recent years, Internet of Things (IoT) technology has received widespread attention. IoT connects many objects with sensing devices and the Internet for information exchange. Wireless Sensor Network (WSN) is an important practice direction of IoT, dedicated to the interconnection of a large number of sensor devices. WSN consists of a large number of low-cost, low-power sensor devices. These sensor devices monitor the environment and acquire data, but the communication link between s...

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Problems solved by technology

[0012] (1) When the mobile node (Mobile Node, MN) selects the PPN, it considers the CPN's expected transmission times, distance, signal strength RSSI value, hop count and other metrics, but does not take into account the quality of the entire communication link, and The network survival time is determined by the first dead node, so only considering the current candidate parent node and ignoring the energy of its upstream link will reduce the survival time of the entire network

[0013] (2) In the process of link construction, when the control message is lost during the forwarding process, if the method of repeatedly sending all the control messages is used, it will cause a large overhead, and if the method of selecting part of the message to be sent repeatedly cannot guarantee the success of the communication link Construct

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