Overview of Key Technologies of Data Transmission in Complex Cognitive Wireless Networks
Shoubai Xiao · 2018
This paper takes the application of complex network theory approach in cognitive wireless networks as the basic background, and discusses the key technologies of cognitive wireless networks based on complex network theory.The basic goal is to optimize the cognitive wireless network's end-to-end performance. .This paper aims at the theoretical and applied research needs of cognitive wireless networks.The results of previous pre-researches are the basic starting point to study the relationship between network transport performance optimization, topology control and routing strategies based on complex network theory in cognitive wireless networks.The basic breakthroughs provide new research methods, research ideas and theories for the study of topology control theory and routing strategies in cognitive wireless networks.With the rapid development of wireless communication technology, a new generation of wireless networks is gradually moving toward diversification, isomerization, and intelligence.An important development trend of the future network is broadband and diversification of services.The main reasons for limiting it are the shortage of spectrum resources and the lack of flexibility of the existing fixed spectrum management modes.The dynamically changing heterogeneous network environment further exacerbates the contradiction between resource shortages and business requirements, thus seriously restricting the deployment and operation of existing and future wireless networks.However, actual measurement data shows that the wireless spectrum is underutilized most of the time and in some areas.In order to increase the utilization of the existing spectrum, Dr. Mitola proposed cognitive radio technology in 1999.Cognitive radios use "secondary use" of licensed spectrum.Dynamic spectrum access allows non-authorized users to perceive and access current idle frequency bands.Cognitive radio networks (CRNs) adopting cognitive radio technology not only include cognitive radio technology, but also put forward more and higher requirements at the network level.The essence is to incorporate cognitive characteristics into the overall wireless communication network.Research Significance At present, there are many researchers researching cognitive wireless networks, CORVUS in Berkeley, University of California, KNOWS system developed by the University of Maryland and Microsoft Research, OCRA project proposed by George Tech, and DRiVE project in EU.With the development of project research, the technology has made some progress in spectrum sensing, network framework, and protocol design.The IEEE has also established an IEEE 802.22 working group for the standardization of this technology.China also attaches great importance to cognitive wireless technology.Both the 863 plan in 2005 and the 973 plan in 2009 support the research of wireless cognitive technology.Compared with traditional wireless networks, cognitive wireless networks also have some new problems that need further exploration and in-depth research.For example, the cognitive wireless network architecture adaptability and the multi-domain environment based on this, the cognitive, network resource distribution management and other issues.In recent years, in response to these problems, domestic and foreign researchers and research institutes have carried out related research, such as spectrum detection/awareness, spectrum sharing, spectrum management, topology control, routing protocols, and transport layer protocols.Complex networks are ubiquitous in a large number of real networks.With the rapid development of network technologies, the network structure is becoming increasingly complex,