High Dynamic Network MAC Protocol Research And Network Communication

With the rapid development of wireless networks,people's requirements for real-time,robustness,compatibility and other indicators of the network have become higher and higher.As the key technology of wireless networks,data link technology is undoubtedly the focus of research and research.The advent of the US military's next-generation data link TTNT(Tactical Targeting Network Technology)has shown good performance in both the quality of communication services and the end-to-end applications in complex environments.The Priority Priority-based Multiple Access(SPMA)based on priority probability statistics is the MAC layer protocol of TTNT.Different from the protocol for channel resource division at the MAC layer,SPMA has higher transmission success rate,supports multi-channel data transmission and reception,and supports the ability to differentiate services for multiple priority services.The main work of this thesis is as follows:This thesis first introduces the development history of the data link and the existing data link MAC layer protocol,and compares these MAC layer protocols.It introduces a new problem for the shortcomings of the traditional MAC protocol and the performance degradation of the statistical channel overload.MAC protocol-SPMA protocol,this protocol is conducive to maintaining channel load stability,improve communication quality,and provide real-time data services.Secondly,the operation mechanism of SPMA protocol is analyzed,and the channel state,multi-priority service mechanism and flow control problem of the protocol are analyzed.The key analysis in protocol modeling is when the system gradually enters saturation state,the data packet Performance such as transmission success rate,system throughput and average delay,and the performance of each priority packet is obtained through simulation comparison.It can be seen that the protocol does not cause channel overload by suppressing the transmission of low priority data packets,thereby providing higher quality services for higher priority data packets.Finally,the analysis of channel statistical modeling is carried out.In the channel prediction model stage,by analyzing the channel occupancy model and introducing the sliding window mechanism,weighted prediction modeling is carried out: the current channel load is determined by the sliding window of historical data.In the channel load statistics,by comparing the physical layer statistical channel load with the network layer statistical channel load,a method for determining the mixed channel load statistics based on the critical error value of the channel load is obtained.However,these methods all introduce large data packet transmission delays and cannot accurately reflect the current state of the actual channel.In order to overcome the problem that the high delay of the retrieval load statistics leads to the decrease of the transmission success rate,this paper uses the statistics of the priority data packet traffic at the MAC layer to reject the low priority data access channel,ensure that high priority data performs well in network transmissions.