Satellite Distance Education System Resource Subscription Protocol Based On Beidou Short Message

China has a vast territory and a large population.Education is a major problem that plagues people's lives.Satellite distance education is an effective way for users in remote areas to accept education.However,the limitation of satellite one-way broadcasting makes it impossible for users in remote areas to subscribe to resources according to their own needs,and can not reverse the data back.Some of the existing interactive satellite distance education systems also have high latency,high communication and network infrastructure construction costs,and are not suitable for interactive distance learning in remote areas.This thesis proposes a satellite remote education system based on Beidou Short-message,which forms a mobile ad hoc network through the terminal devices of users in remote areas to send subscription information and data resources between end-users.A fixed node(proxy)with a short message interface is installed in each region.The proxy in the remote area and the mobile PC form a DTN network through Bluetooth.After obtaining the data resource and resource list,the proxy establishes a socket connection with the PC client,and sends the data resource and the resource list to the PC client.After obtaining the resource list,the PC client generates subscription information according to its own needs,and sends the subscription information to the proxy in the same way.After receiving the subscription information,the proxy encapsulates the subscription information into a Beidou Short-message and sends it to the broadcast server,thereby realizing the resource subscription of the PC client.The solution does not require the deployment of additional network facilities,high network coverage,delayed data transmission and low communication costs.And it is suitable for interactive satellite remote teaching in remote areas with imperfect network facilities.This thesis combines the Beidou Short-message transmission protocol,proposes a set of subscription message transmission protocol for remote areas,and transmits the subscription message through the Beidou Short-message.At the same time,the DTN technology and IPv6 technology are combined to design and implement the IPv6 over DTN communication mechanism,and the data communication and interaction between the proxy and the PC client are completed.