Optimal Resource Allocation For NOMA-Cache MmWave Systems

Recently,research of wireless communication technology in the fifth-generation mobile communication system(5G)has attracted the attention of all parties.The deep integration of5 G and Internet of Things(IOT)technologies means that the center of data services is undergoing a transformation from human to machine,which will inevitably lead to a technological revolution in wireless architecture and intelligent services.Behind the new conceptions such as the Industrial Internet of Things,Smart Agriculture and Smart City are massive amounts of wireless devices and wireless data traffic to satisfy multi-device connections and users' further pursuit for higher data rate,transmission bandwidth,lowlatency quality of service(QoS)and low interference.As a key candidate technology for 5G,non-orthogonal multiple access(NOMA)technology can further improve spectrum efficiency compared to traditional orthogonal multiple access technology,allowing the system to afford more users.The combination of NOMA and Cache technology can further improve the spectrum efficiency and data transmission rate.5G uses the millimeter wave frequency band to provide ultra-high-speed mobile broadband.Millimeter wave(mm Wave)can achieve multi-gigabit link speed and excellent spatial multiplexing by virtue of its abundant bandwidth resources.Furthermore,NOMA technology and millimeter wave technology have good compatibility with many existing advanced communication concepts,and many professionals believe these two technologies have promising further.In this paper,the author combines NOMA technology,millimeter wave technology and cache technology to study the resource optimization problem in the millimeter wave system based on multiuser NOMA-Cache.The specific work can be divided into the following two parts:1.Firstly,we investigate the energy allocation problem in the dual-user NOMA-Cache communication system,and based on the user's channel difference and the difference in cache content,we aimed to minimize the average user delay.And according to the derivative of the user's transmission delay to energy.Analyzes the user's energy allocation scheme under each NOMA-Cache combination,and proposes an energy allocation algorithm based on the time sensitivity of dual users.The simulation result table shows that,compared with the traditional time division multiple access technology,the technology combination of NOMA-Cache has a great advantage in reducing user delay.2.Then,we will apply NOMA-Cache to the multi-user millimeter wave system.In the energy-limited multi-user NOMA-Cache mm Wave system,by optimizing the beam width of users,the combination of NOMA-Cache between users and the user's Energy allocation minimizes the average delay of users.To solve the above problems,the author developed a multi-user-based time-sensitive energy allocation algorithm and chemical reaction optimization algorithm-based NOMA-Cache pair and beamwidth selection algorithm(CRONCPBSA).The simulation result table shows that,compared with the time division multiple access technology,the CRO-NCPBSA algorithm proposed in this paper and the energy distribution algorithm based on multi-user time sensitivity can give full play to the advantages of these three technologies and significantly reduce the average delay of users.