Research On Access Architecture Of Wireless AD-Hoc Network Oriented To Large-scale Nodes

Wireless ad hoc network is a network system that does not rely on ground infrastructure,and has a wide range of uses due to its dynamic topology and strong invulnerability.In recent years,with the complexity and diversification of wireless ad hoc network application scenarios,the node scale of wireless ad hoc networks also increases.In the wireless ad hoc network of large-scale nodes,how to access channels for a large number of nodes,and how to reasonably allocate and use channel resources has become an urgent problem to be solved.From the public information,the research on the channel access technology of the wireless ad hoc network of large-scale nodes is still relatively small,and most of them are still in the theoretical aspect.Aiming at these problems,this paper designs and implements a wireless ad hoc network channel access architecture that can support 128 nodes.The main work of the paper is as follows:Firstly,the research status of wireless ad hoc network and channel access technology is investigated.The key technologies and problems faced in the development of wireless ad hoc networks are summarized,several typical channel access technologies in wireless ad hoc networks are analyzed,and the design requirements of wireless ad hoc network access architecture are given.For a specific large-scale node application scenario,the functional requirements and performance indicators in this scenario are analyzed.Secondly,the channel access architecture of wireless ad hoc networks for large-scale nodes is designed.In this paper,a dual-channel dynamic TDMA access protocol based on allocation class is designed.According to different signaling transmissions,the control signaling adopts a fixed-allocated access protocol,and the service signaling adopts a reservation-type dynamic access protocol.The detailed structure of MAC layer time slot division is given,and the time synchronization scheme and the time slot application and release process of nodes are determined.Finally,the overall design and characteristic analysis of the physical layer are given.Thirdly,the implementation of the wireless ad hoc network channel access architecture is carried out on the hardware platform based on Xilinx Zynq-7035+AD9361,the hardware platform used is introduced,and the specific software implementation scheme based on FPGA and ARM is given.The realization process of the key modules of the MAC layer is given,and the concrete realization of the interface between layers is given.Completed the testing and verification of the access architecture.The test results show that the access architecture designed in this paper can guarantee the network access delay less than 10 s,the first link establishment delay less than 2s and the success rate of timeslot application higher than 90% under the condition of full node access.Design requirements.In this paper,a design and implementation scheme of a channel access architecture is given for the wireless ad hoc network scenario of large-scale nodes,which has a certain reference value for the engineering implementation of wireless ad-hoc network in the large-scale node scenario.