一种适用于智能家居的分布式网络架构设计与实现

随着智能家居的普及，越来越多的设备需要连接到家庭网络中，传统的家庭 网络以集中式组网为主，集中式的网络拓扑中，设备接入数量过多会增大中心路 由器的压力，进而可能降低通信时延等网络性能指标。 为了解决传统家庭网络接入设备数量受限的问题，本文根据家庭网络特点设 计并实现了DHNet分群组网系统。DHNet组网系统解决了现有家庭网络节点数量 组网延迟高、查表转发开销大、服务访问延迟高的问题：采用分群组网的方式去中 心化，将家庭网络中的节点分成多个群，每个群选举一个网首来管理群，降低了中 心路由器的压力；采用分布式组网的方式将上百个节点30s以上的组网时间降低 到10s内；通过新增一个携带路径矢量的包头的方式，实现无表转发，将转发效率 提升15%左右；通过服务主动推送与服务被动请求相结合，以及在更底层实现服 务发现的方式，将家庭网络中服务访问的平均时延降低50%左右。此外，DHNet 系统能对现有IP网络做到向后兼容。 我们基于Linux容器技术实现了一个通用的网络拓扑模拟工具，并在仿真环 境下测试了DHNet在上百个节点下的网络性能表现。同时，我们将DHNet系统移 植到台式机、手机、路由器等众多不同的设备，使用二十台以上的实物设备搭建 实物环境测试了DHNet的性能。

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