Research On Statistical Priority-based MAC Protocol For Data Link

As the key technology of information warfare,data link technology can connect sensors,weapon platforms and command post to form an integral whole to achieve the seamless exchange of information between combat units and ensure combat commanders can make decisions quickly and accurately.The development of the data link has promoted the development of information weapons which has further changed the way of modern warfare.As an important part of the US military's new generation of data link construction,TTNT is a high-speed,broadband and new battlefield network technology based on IP protocol.It can achieve the rapid interconnection of the combat platforms and the transmission rate is extremely high,so as to ensure the precise strike of the time-sensitive targets,greatly enhance the US military's network-centric warfare capabilities.TTNT data link channel access control protocol using SPMA protocol with dynamic and fast networking,support multi-node simultaneous communication,support a variety of business priority distinction,high priority service can immediately access the channel ability.In this paper,we analyze and summarize various MAC protocols.In view of the shortcomings of existing MAC protocols,SPMA protocol is designed with reference to TTNT related patents.Firstly,the physical layer working mode of SPMA protocol is analyzed.The physical layer adopts the time hopping frequency hopping and the channel coding technology to make it have some error correction ability and the node has the ability to send and receive packets at the same time.Then,this paper introduces the design of SPMA protocol and the random access mechanism.The SPMA protocol focuses on the design of channel load statistics,priority threshold setting and back-off algorithm.On the basis of the SPMA protocol,the design of the random access mechanism is implemented to realize the fast access network.Finally,this paper uses OPNET simulation software to simulate the scheme.In the OPNET simulation,two kinds of network scenarios are designed to simulate the SPMA protocol and the random access mechanism.Reasonable hierarchical node models and process models based on finite state machine are designed to simulate the workflow of the scheme.The design of the wireless pipeline phase is used to simulate the physical layer working mode of the SPMA protocol.A variety of statistics are designed for statistical analysis of network performance.The theoretical analysis and simulation results show that the SPMA protocol designed in this paper can guarantee the high transmission success rate and low delay of high priority packet and solve the problem that the network performance is seriously deteriorated due to the heavy load of the network.At the same time,the random access mechanism designed in this paper can make the random node access the network quickly.The performance of the proposed scheme is verified.