Research On Intelligent Channel Allocation Technology Of MRMC Ad Hoc Network Based On CSMA/CA

Compared with single-interface networks,Multi-Radio MultiChannel(MRMC)wireless ad hoc networks can make full use of spectrum resources to reduce network interference and improve network performance.At present,the research on MRMC ad hoc networks for UAV air-ground communication scenarios has become a hot topic,and the spectrum channel allocation scheme between air-ground communication devices will directly affect the overall performance of the network.A reasonable spectrum channel allocation scheme can not only make full use of radio frequency interfaces and spectrum resources,but also effectively ensure network QoS requirements,reduce network interference,and improve network throughput.Therefore,how to reasonably allocate spectrum channel resources is a key issue in the research of MRMC UAV air-ground communication ad hoc network.At the same time,the CSMA/CA protocol can determine the packet sending and backoff behavior of MRMC ad hoc network nodes,which has a direct impact on the network throughput.Therefore,modeling and analyzing the network throughput based on the CSMA/CA protocol is a key issue to study the network throughput of MRMC ad hoc networks.In view of the above two problems,the main research contents and results of this thesis are as follows:For CSMA/CA-based MRMC network throughput research,there is currently a lack of saturated network throughput modeling methods for MRMC in multi-collision domain scenarios with general network topology.Aiming at this problem,this thesis proposes a CSMA/CA-based multicollision domain MRMC network throughput modeling method to achieve mathematical modeling of network throughput.By combining the specific network topology and the two-dimensional Markov chain node state model,the node packet sending probability and packet collision probability are obtained,and then the relationship between the network throughput and the two is established.In this thesis,the modeling method is applied to the ring UAV formation network for throughput analysis.The simulation results confirm the rationality of the modeling method,and show that the MRMC configuration structure is better than the single-radio single-channel(SRSC).For the channel allocation research of MRMC network based on throughput maximization,the current research on UAV air-ground communication scenarios still needs an efficient distributed throughput maximization channel allocation algorithm with guaranteed QoS.Aiming at the UAV-ground sensor cluster header MRMC heterogeneous ad hoc network scenario,this thesis establishes the network uplink throughput and UAV available bandwidth,ground sensor cluster header transmission rate,The mathematical relationship between network interference,etc.,and a Distributed Polling Matching Throughput Maximization(DPMTM)channel allocation algorithm is proposed.The algorithm aims to maximize the network uplink throughput.Under the conditions of ensuring the QoS requirements of the ground sensor cluster header transmission rate,the available bandwidth of the UAV and the limited RF interface,the available bandwidth of the UAV is divided by intelligent matching.uplink channel.The simulation results show that the DPMTM algorithm has a faster convergence speed,and compared with other algorithms,it can increase the uplink throughput by more than 17%while ensuring the transmission rate QoS requirements,and can more effectively utilize the spectrum and interface resources.Enter more ground sensor cluster headers.