Design And Implementation Of Ultra Short Wave Narrowband Wireless Trunking Communication Protocol

In mountainous areas,remote areas,ultra-long tunnels,etc.,where broadband wireless communication is prone to be outage,information transmission cannot be fully satisfied with the needs of real-time and error-free by broadband wireless communication alone.Compared to the broadband communication,the narrowband communication has a simpler structure and lower cost,and the narrowband frequency hopping is more robust in anti-interference.On the other hand,the advantages of high spectrum utilization and channel sharing and large system capacity of trunking communication can complement the advantages and disadvantages of narrowband communications,and by combining and jointly optimizing the design of the narrowband and trunking communications can obtain the narrowband trunking communication system with better performance.This thesis studies the ultra-short-wave narrow-band wireless trunking communication protocol.The main wireless trunking communication systems(such as Tetra and i DEN)have matured,and there are problems such as relatively mature research and core technology to be improved.At present,in the period of rapid development,TD-SCDMA long term evolution(TD-LTE)wireless trunking communication protocol has many advantages,which includes mobile base stations,strong protocol compatibility,advanced technology that can greatly improve spectrum efficiency,the flat network architecture that can effectively reduce delay,and strong anti-interference ability.The ultra-short wave narrowband wireless trunking communication protocol is composed of the narrowband TD-LTE protocol and wireless trunking communication technology,which can realize the functions of single calling and group call and short message data transmission.However,the TD-LTE wireless trunking communication protocol does not have a unified standard.This thesis analyzes the functions that the TD-LTE wireless trunking communication protocol can achieve on the terminal side,as well as the module architecture and process required by the various layer protocols to achieve the corresponding functions.The thesis designs and implements the modules of each layerand the interface between the layers.First,this thesis introduces the development status and research background of the trunking communication system and TD-LTE technology,and combines the two to analyze the research significance of the ultrashort wave narrowband wireless trunking communication protocol.Next,the thesis introduces the architecture of TD-LTE communication system and the stack of TD-LTE protocol.The thesis analyzes the design and implementation of the TD-LTE trunking communication system's protocol,where multiple existing schemes have been analyzed and summarized.These schemes include the theory and the implementation plan of PDT and TETRA.The thesis analyzes and compares the above implementation schemes with the implementation of TD-LTE trunking communication system.Through the analysis and comparison with these schemes,we can make our own design plan.The main content of this thesis is the design and implementation of an ultra-short wave narrowband wireless trunking communication protocol.In the stage of designing,the thesis designs the overall architecture of the protocol,which includes the protocol requirements,the overall modules,and the overall business processes.And then the thesis designs the stack of TD-LTE protocol's layers according to the functions,which includes the layers' architecture and layers' modules and modules' interfaces.In the stage of the implementation,the thesis implements all layers of the protocols based on protocols' requirements and processes by using a combination of FPGA and ARM.The thesis implements some functions such as transmission data and single call in the narrow-band trunking communication system.Then,this thesis tests the feasibility of the functions of the proposed ultra-shortwave narrowband wireless trunking communication protocol.The test section mainly includes the test environments,the test processes,and the test methods.According to the test results of various functions,we can ensure the validity and correctness of the proposed protocol.Finally,we summarize and conclude the thesis.