Research On Protocol And Test Technology Of Satellite Mobile Communication

The research and development of a new generation of satellite mobile communication system in China has provided an important means to promote our wide area communication and high throughput data transmission.Stable and reliable protocol stack is the important foundation of satellite mobile communication system service. It is necessary to carry out many researches on the development, test and application of the protocol stack. Protocol conformance test is an important support for the normal operation of the satellite mobile communication system, high beam switching strategy provides an important condition for the satellite mobile communication system, visual monitoring is an important practice of satellite mobile communication intelligent monitoring.There are serval problems in protocol stack of satellite mobile communication network in China:(1) Static and delay satellite mobile communication protocol can not satisfy with requirements of global control and on-demand construction.The structure could not separate the control signaling and data.(2) Under the limitied channel of satellite communication, the users are distributed geographically unevenly, so it's hard to achieve continuous services in the edge of beam coverage.(3) There is a problem of test asynchronous for the remote physical isolation of different objects, the expression of test result is not correct for the discrete distributed collection.Supported by the national high technologies project, we focus on the protocol of satellite mobile communication, and operate a series of researches on that. The main innovations are as following:First, aimed at solving the problems of low efficiency and difficult component reuse in protocol stack development, we proposed a dynamic and reconfigurable satellite mobile communication protocol stack. A new atomic model was developed to achieve adaptive transform by atomic absorption and divergence. It also improved reconfigurable protocol stack development of adaptive and fast processing ability. Compared with the object model and the process model, the protocol bias of the new model development technology is reduced by 22.2% and 40.3%. The connection latency of the developed protocols decreased by 32.4% and 36.1%respectively.Second, focused on the problem of asynchronous protocol test information, a new technology of satellite mobile communication test and monitoring based on sparse clustering and convolutional neural was proposed. It had a new framework with two channel and multi-ferries,and made ontology feature clustering protocol stack index compression and convolutional neural network network behavior prediction. The Iu-Ps test platform had been developed. The simulations shown new method is reduced by 63% and 63.2%, and the test response time is reduced, 1.92s and 2.53s.Third, we proposed a delay switching strategy of satellite mobile communication with multi factor fusion, in order to solve the problem of nonuniform channel quality and resource heterogeneity. Virtual beam clustering model was designed, and the integrated model of switched beam fusion channel state, location information and service effect was constructed. They effectively solveed the problem of low beam switching success rate, low efficiency and "Ping-Pong" problem. The tests shown they improved the success rate of about 2.5%, and reduced the probability of "Ping-Pong" switching 69.6%. They met the requirements of high-speed mobile satellite mobile communication service demandFourth, in view of the capacity shortage and the channel assignment problem of the transmission of image information in multi-scale networks,we exploited Laplasse's method to decompose large scale image into low resolution images, and morphological features of two valued images is designed. They improved the adaptability of compressed images. A multi-scale image transfer protocol based on highly adaptive feature images is studied. Frequency offset estimation and channel synchronization strategy based on M-Walsh codes were realizatied. The multi-scale system platform operated different tests to verify the frequency offset estimation of this algorithm relative to the L&R algorithm. RMSE value is raised by nearly 36.2%, and the BER performance is improved by 29.5%.