Optimization And Design Of MAC Protocol In Wireless Ad Hoc Communication System

Mobile Ad hoc networks can quickly establish networks without relying on centralized infrastructure to effectively support military scenarios that can not be covered by centralized wireless networks,such as war environments where central infrastructure is compromised or lack the appropriate infrastructure.Wireless Ad hoc network communication system can meet the communication needs of small-scale manned cooperative operations in the scenario,such as street fighting,jungle combat and field investigation.Researching and developing this system has important practical significance for national security and national defense construction.Based on the self-developed wireless Ad hoc network communication system developed independently in China,this paper optimizes the MAC protocol in the Ad hoc network communication module,which mainly solves the problems of too long network access time and data slot utilization in the current research and development stage Low and other issues.First of all,this paper studies the design of the existing network protocols and the specific examples of the network.It finds that existingdesigns have a long time to access the network,slow synchronization of the network out-of-network information and inefficient sub-network segmentation and convergence.This paper analyzes the causes of the abo ve problems and network requirements,the corresponding optimization program specific strategies include:(1)The use of time slot backoff algorithm to address the problem of multi-node network access conflicts(2)The design of a new frame structure to shorten the super-frame duration,thereby shortening the network access,network retirement,sub-network segmentation fusion time.(3)Optimize the strategy of the existing network nodes to cope with the service frames sent by the access network nodes so as to shorten the time for the access network nodes to access the network.Through the OPNET simulation experiments,this paper verifies the effectiveness of the above strategies in eliminating network entry conflicts,reducing network access time and improving network topology change efficiency.Secondly,this paper studies the existing data slot allocation protocol and combines with specific examples to find out the unreasonable issues of the fixed slot allocation and dynamic slot allocation strategy.Analyze the causes of the above problems and further combine the requirements of data slots,the corresponding optimization scheme is proposed.Specific strategies include:(1)A new fixed time slot assignment algorithm is designed to solve the problem of Unevenly allocated fixed time slots,fixed slot idle rate high problem.The simulation results of OPNET show that the network throughput and the fairness of the time slot allocation all have different degrees of improvement in different scenarios.(2)Propose a new dynamic slot allocation algorithm,which reduces the reservation complexity of dynamic slot reservation,enhances the reservation release efficiency of dynamic slot reservation,enhances the service following ability of dynamic slot allocation,and solves the problem of dynamic slot Under the condition of complete allocation,the new demand node can not reserve the problem to the dynamic time slot and verified through the simulation.