Research And Implementation Of Handheld Device Opportunity Network Data Distribution System

In recent years,with the development of technology,handheld devices are equipped with Bluetooth and WiFi direct communication modules.By using Bluetooth and WiFi direct technologies,handheld devices can connect with each other and transmit data without using the Internet.And this connection method can be used to reduce the load on the Internet and the use of traffic and avoid the expense of paying for traffic.Most of the data distribute algorithms are based on the Internet,for both Bluetooth and WiFi direct have the feature of forming ad-hoc networks within short distances and communicating with each other within the network.However,these two communication technologies have their advantages and disadvantages when used.Hence,this paper presents data distribute algorithms of the opportunity network based on these two technologies in handheld devices.First of all,this paper researches the data distribute algorithms based on the Bluetooth handheld device opportunity network,according to the characteristics of handheld devices Bluetooth with short-range communication.Using the Bloom Filter data structure in the Bluetooth device name and dividing the Bluetooth name according to the structure,various status information of the handheld device is dynamically displayed in the Bluetooth device name in order to make it visible to other devices nearby.At the same time,the Bluetooth Positive data distribute algorithm and the Bluetooth Negative data distribute algorithm have been developed.And the research result of this paper that bluetooth-based data distribute algorithm is obviously superior to the existing PASA algorithms has been put out by the experiment.Secondly,this paper studies the data distribute algorithm based on WiFi direct handheld device opportunistic network according to the communication characteristics of the handheld WiFi direct.When the device is connected to the network,set the GOIntent value according to different situations and determine which node is the Group Owner in the LAN.Choosing the right GroupOwner can greatly improve the efficiency of data distribution.At the same time,the positive data distribute algorithm based on WiFi direct and the negative data distribute algorithm based on WiFi direct are proposed.And the experiments are performed to verify that the two algorithms have advantages in different situations.Finally,the reward mechanism for handheld device data distribution systems,which is designed in this paper,motivates more users to participate in the data distribution activities.The author tries to avoid too many selfish nodes in the network so that to improve the efficiency of data distribution,and proposes methods for data slicing and reorganization for large-capacity data.Moreover,the author performs fragmented transmission of large data to increase transmission success rate,and proposes the opportunity network data distribute algorithm based on the Bluetooth and WiFi direct mixed handheld devices.The advantages of Bluetooth and WiFi direct are used rationally.The result that this algorithm is superior to the above algorithm in connection success rate is also verified.