| With the construction of a smart city,the development of the Internet of Things is changing people's lifestyles.As the TCP / IP standard has gradually become the true standard for the Internet,6lowpan has been widely researched and discussed since introduced in 2012.In this paper,a 6lowpanbased neighbor discovery protocol for mobile nodes is propose by constructing a grid-like mesh with active-sleep nodes.The research is divided into three parts.Firstly,a basic 6lowpan network architecture is constructed according to the requirements of smart city construction,and the IPv6 address structure transmitted on it is designed.Then,the neighbor discovery of mobile nodes is studied respectively in the process of network initialization and the process of node mobility after the initialization.Finally,the communication between nodes in Internet while mobilizing is designed and implemented,and the reliable data communication is completed.In order to realize the initialization process of 6lowpan network,this paper firstly initializes the backbone network composed of solid node(SN)and 6lowpan border router(6LBR).The initialization process is based on RFC 6775.Subsequently,a secure MN registration method is proposed.The method utilizes a modified ARO frame to make use of Neighbor Solicitation(NS)and Neighbor Advertisement(NA)during address registration of a node.In this paper,the way of mathematical proof is used to prove that the probability of MN node being compromised under the proposed method is almost zero.In order to realize the mobility handover of MN node in mobile process,this paper proposes the discovery mechanism of neighbor associated nodes in the process of MN node mobility.This mechanism is used to design 6lowpan intra-domain mobility and 6lowpan inter-domain mobility.And frame format design of the IEEE802.15.4 bacon designed during the move.In this paper,NS-2 communication simulation tools is used to simulate the mobility handover delay and packet loss rate in the process of two variables,which are moving speed and network size.At the same time,comparing the mobility scheme with the existing mobility scheme,the comparison results also reflect that the scheme proposed in this paper is better.Finally,this paper presents the communication design between nodes in the Internet,and uses the hardware node carrying Contiki to application.In the process of communication,using wireShark tool to capture and analyze the datagram generated in the process of network communication. |
