Research On Service Differentiation Of IEEE 802.11 And M2M Communications By Using NS-3 And MATLAB

With the development of wireless communication technologies,wireless local area networks(WLAN)play an increasingly important role in people's lives.WLAN adopts IEEE 802.11 standard,IEEE 802.11e provides differentiated services for network business and supports multi queue to sending in workstations.Because of the strict MAC competition parameters,IEEE 802.11e is easy to bring about the matter of fairness of data transmission.On the basis of IEEE 802.11e,a new service differentiation mechanism is proposed in this paper.It distributes bandwidth resources equitably according to the proportion of data flow in the network.The purpose is to make each type of business fair to be sending.The new mechanism maintains the multi priority queue within the workstation,but only one queue group is allowed to participate in the channel competition each time.The selection of the packet is completed by queue scheduling mechanism of the workstation,the channel competition between stations abandons the strict competition parameters and the priority is determined by proportion of the data flow and throughput acquired during the adjacent period.Analyze the network performance of two mechanisms through the network model built under NS-3,the results show that the new mechanism provides better service for other services under the delay requirements of multimedia services.It not only improves the fairness of the network,but also improves the total throughput of the network.Then,aiming at Machine to Machine(M2M)communications in WLAN environment,we propose a communication mode that can improve its quality of service(QoS).The communication mode configures the Human to Human(H2H)device to M2M communications gateway,and use the two hop relay transmission to jointly control the access of M2M devices.Aiming at power and slot allocation in transmission,this paper proposes an efficient and energy-saving radio resource allocation scheme.The simulation shows that the scheme can effectively reduce energy of M2M terminal under the premise of data transmission delay,and compared with the traditional M2M communications,the survival period of the M2M terminal group is obviously improved.