Research On D2D Device Discovery Technology

With the continuous development of mobile communication technology and the rapid growth of multimedia business needs,improving the transmission rate of the system and the utilization of spectrum resources has gradually become an urgent problem need to be solved in the field of mobile communication.Device-to-Device(D2D)is one of the key candidate technologies for 5G.It is a short-range communication method,which can realize the direct communication between equipment and equipment under the control of base station.D2 Dcommunication technology not only can improve the overall system throughput and spectrum utilization,but also can improve the quality of communication of edge users.Compared with traditional short-range communication technologies such as WLAN,WIFI and Bluetooth,D2 D communication technology can reuse the spectrum resources of the authorized band to obtain more efficient,safe and reliable communication quality.The discovery of potential D2 D user is the prerequisite and basis for establishing D2 D communication and the efficient device discovery strategy helps to achieve better D2 D communication services.Therefore,this thesis focuses on D2D's device discovery strategy,as follows:In the scheme of autonomous device discovery,due to the information scheduling problem,users usually use the random beacon detection mode to discover the device.The user needs to keep transmitting and detecting the beacon for the discovery of device,which is time consuming and energy consuming,and which cannot be very good to achieve the trade-off between the accuracy and power consumption.In this thesis,the scheme of neighbor device discovery based on channel space correlation is given,and the beacon scheduling is carried out by using the spatial correlation of the neighbor user channel.Through theoretical analysis and numerical simulation,it is found that compared with the traditional equipment discovery scheme,neighbor users' device discovery scheme can accurately identify the potential D2 D users with lower power consumption.D2D communication technology and social networking are interactive,users always need to continue to socialize with the surrounding users and exchange a lot of information,thus forming a mobile social network.In the field of communication,it will be more efficient to transfer data with social network,thus the social network canbe introduced into the communications technology.An equipment discovery program based on social network is discussed in this thesis,which can use the social network features to assist the discovery process.The simulation results show that the scheme can improve the discovery ratio of the equipment effectively under the reasonable energy budget,and also has certain energy saving effect.