Modeling the Operation of the Service Channel of Satellite Broadband Access Networks

Satellite broadband access networks require arrangement of receiving communication and data services by subscribers using a service channel through which technological information is exchanged between subscribers and the central Earth station in order to organize subscriber sessions. Analysis of possible procedures of data exchange over the service channel, taking into account similar solutions for terrestrial mobile networks and the specifics of satellite networks, shows that these procedures are close in logic to the S-ALOHA protocol, with the difference that the stream of slots for random multiple access is thinned out due to the need to reserve some slots for transmitting confirmations of the parameters of dedicated traffic channels. A criterion for choosing the preferred procedure is ensuring its successful operation with a specified high probability in the shortest possible time. The aim of this study is to develop a model that makes it possible, depending on the service channel operation procedure used, to estimate the time required to achieve a specified probability of successful operation with an accuracy acceptable for practice. The model is a tool for comparing the procedures of the service channel and selecting preferred options, providing a selective time allocation function for processing the procedure for exchanging technological information, based on which estimates of the required time are given to achieve a specified probability of successful operation. Three options of the procedures that use different ways of conflict resolution are implemented. In addition, the model allows for the inclusion of program blocks describing other procedure options and can be used to justify decisions on designing satellite broadband access networks.