中文摘要：

该文针对无线物联网中的多路径、多中继切换场景，提出了一种基于层次化网络编码（HNC）的协作切换机制。HNC机制在传统实用网络编码的基础上，利用中继节点距离网络接入点的跳数差异，引入了多层中继圈的思想，对网络进行分层。通过位于不同网络层次的中继节点的相互协作，建立移动终端与远程网络接入点之间的切换连接。HNC机制使移动终端在移动过程中可以保持可靠的切换连接。

英文摘要：

A cooperative handover mechanism based on a Hierarchical Network Coding （HNC） is proposed for multi-hop, multi-path handover scenario in wireless internet of things in this paper. Based on traditional practical network coding, HNC makes use of the different hop between mobile terminal and network access point~ and adopts multi intermediate circle to divide levels in the network. With the cooperation of intermediate nodes in different levels, mobile terminal can establish handover connection with remote access point. HNC keeps reliable handover connections during the terminal is moving.