Research On Extension And Prototype Implementation Of The Signaling Protocol In Hybrid Satellite And Terrestrial Networks

The hybrid satellite and terrestrial networks have the advantages of wide coverage, long communication distance, less geographical condition limitation, flexible networking and easy implementation, etc. This hybrid networks has become one of most promising research direction in the future. However, compared with the terrestrial networks, the hybrid satellite and terrestrial networks have the disadvantages of large delay and relatively high bit error ratio in satellite channel, limited resources and low processing capability, etc. These characteristics result in the higher requirements of the signaling system for the hybrid satellite and terrestrial networks. Therefore, it is necessary to study the signaling system of the hybrid satellite and terrestrial networks, and to put forward the signaling scheme that adapts to the special satellite environment.Firstly, by making the analysis on the advantages and deficiencies of both satellite networks and terrestrial networks, this dissertation reviewed the hybrid satellite and terrestrial networks, and also introduced research situation and development trend of the signaling system for hybrid satellite and terrestrial networks. Secondly, we compared two widely used signaling protocols: Resource Re Ser Vation Protocol-Traffic Engineering(RSVP-TE) and Constraint-based Routed Label Distribution Protocol(CR-LDP). In accordance with the functional requirements of various exchange types and resource reservation of the hybrid satellite and terrestrial networks, it is indicated that the RSVP-TE signaling protocol is more suitable to the hybrid satellite and terrestrial networks. Then the RSVP-TE signaling protocol is introduced in detail from these aspects, including the establishment of Label Switching Path(LSP), the messages and the objects of the signaling, etc. Finally, based on RSVP-TE signaling protocol, the main study efforts in this dissertation are listed as followed:(1) Facing to the characteristics of large delay, relatively high bit error ratio and limited processing capability within satellite switching node in satellite networks, we improve the function structure of both Label Switching Router(LSR) and Label Edge Router(LER) in the satellite signaling processing scheme, and extend part messages of RSVP-TE signaling protocol which is applied to the terrestrial network from these aspects, proposing the structures of both hierarchical multi-granularity label object and label request object for the establishment of the nested Label Switching Path(LSP), and simplifying the objects of the signaling message. Then we present the signaling procedure of Multi-Granularity-Label Switching Paths(MG-LSPs) establishment in parallel, and also make the analysis on the time delay in signaling messages transport.(2)According to the functional requirement of RSVP-TE protocol prototype system, the RSVP-TE signaling protocol module in the signaling system framework is designed and implemented. Based on the analysis of both messages structure and messages format, the signaling message processing is given in detail and implemented via C/C++ programming language.(3)The function of RSVP-TE protocol prototype system is tested from such aspects as the basic RSVP protocol, the establishment of MG-LSPs and label exchange. We also make an analysis on the test results.