Design And Research Of Multi-frequency Point MAC Layer Protocol Signaling Message For Centralized Ad Hoc Network

The wireless multi-hop network is widely used in various fields because of its flexible networking and self-healing and self-management characteristics.The wireless multi-hop network adopts a centralized scheduling mechanism to effectively reduce the collision of messages.However,as the increase of services requirements on network performance,the centralized self-organizing network at a single frequency point is difficult to meet the service requirements when the channel deteriorates,and network capacity and network stability are tested.In view of the above problems,this paper proposes a centralized TDD(Time Division Duplexing)multi-frequency point wireless ad hoc network MAC(Media Access Control)protocol.The multi-frequency point technology effectively solved the problem of insufficient single-point network stability and limited capacity by reducing the interference between links and improving the reuse of wireless channels.In terms of theoretical analysis,this paper establishes a network performance model considering link quality,analyzes the impact of various parameters on network stability and capacity,and provides a MAC layer for the development of multi-frequency wireless multi-hop ad hoc embedded devices theoretical support.First,this paper analyzes the bottleneck of the current single-frequency wireless ad hoc network in terms of network stability and capacity,and proposes a multi-frequency technology.Then we design the MAC protocol of the multi-frequency wireless ad hoc network based on the single-frequency wireless ad hoc network protocol architecture,mainly from the frame structure and message structure design,network establishment and maintenance,resource scheduling mechanism and scheduling resource multiplexing algorithm In-depth study of these three aspects.Based on the reason of the MAC layer protocol architecture of the multi-frequency wireless ad hoc network,this paper establishes a protocol-based network performance analysis model to explore the specific numerical relationship between protocol parameters and other parameters and network performance.This paper mainly studies the two typical performance indicators of scheduling delay and effective throughput,and performs numerical simulation analysis on these two network performance expressions,then use the performance relationship curve to describe the dependence and change trend between the network performance and each parameter.we theoretically analyze the stability and capacity of the network and select the optimal protocol parameters.Finally,we wrote the MAC layer protocol simulation code in Visual Studio 2010 software and built a dual-RF hardware architecture based on the Xilinx Zynq 7035 hardware platform to provide the MAC layer program foundation for the development of the hardware platform.This paper combines theoretical analysis with engineering practice,designs a centralized multi-hop network MAC layer protocol based on multi-frequency points,establishes a multi-frequency point scheduling delay and effective throughput model,and verifies the research results of the paper on a software or hardware platform.Feasibility has certain reference value for work in related fields.