安卓手机Wi-Fi Direct信道智能选择软件系统设计与实现

发布时间：2018-01-19 10:23

本文关键词： Wi-Fi Direct 安卓系统信道选择 wpa_supplicant 干扰避免　出处：《武汉邮电科学研究院》2017年硕士论文　论文类型：学位论文

【摘要】：随着互联网的不断发展,中国正逐步进入一个高速信息化的时代,移动互联网在网络中所占的比重越来越大。智能手机作为移动互联网平台中占比最大的接入设备,了解并掌握其技术与发展显得十分重要。从2007年安卓被谷歌公司收购以来,它每一次更新换代都备受全世界的关注。安卓系统凭借自身绚丽友好的界面设计和开放合作的商业模式给它带来了巨大的成功。与此同时Wi-Fi作为一种便捷高效的无线局域网传输技术,它的出现和发展大大地解放了传统网络设备移动范围受限的问题。自从安卓系统结合市场上较为流行的Wi-Fi Direct技术发布了Wi-Fi Display功能的产品以后,关于无线高清视频传输技术的讨论就从未停歇。Wi-Fi 2.4GHz频段的网络由于频谱资源的紧缺性和来自类似蓝牙等其他同频无线设备的干扰的原因,加之为了满足无线高清视频传输对信号的实时性与稳定性的需求,2.4GHz频段上Wi-Fi信道的合理选择就显得尤为重要。本文首先简要介绍安卓系统的组成结构以及安卓系统中的关键技术知识,研究Wi-Fi的物理特性以及802.11协议中使用到的关键类型MAC帧结构。通过分析安卓系统中Wi-Fi部分的技术架构与实现原理,重点研究了wpa_supplicant的代码框架,研究分析了安卓系统中现行的Wi-Fi Direct信道选择方案的不足,在现有方案基础上通过程序优化设计并编译安卓系统源码,以重写手机Image文件的形式使安卓手机具有智能化的信道选择功能。最后对方案优化前后的手机设备进行了对比实验,通过在两种不同无线环境下传输大容量文件进行实验模拟,通过观察信道的自动选择、传输速率和传输时长来判断Wi-Fi Direct通信质量的优劣。并在测试实验结果基础上进行了分析,实验结果显示在Wi-Fi Direct通信过程中通过实现信道智能选择,能够较大程度的提升传输的速率与稳定性。论文创新点在于,通过系统软件修改的方式较传统硬件升级具有好的灵活性与可迭代性,用户通过系统升级即可完成Wi-Fi Direct信道智能选择。
[Abstract]:With the continuous development of the Internet, China is gradually entering a high-speed information age. The proportion of mobile Internet in the network is increasing. Smart phone is the largest access device in the mobile Internet platform. It's important to know and master its technology and development, since Android was acquired by Google in 2007. Every new generation of Android has attracted worldwide attention. Android has been a huge success with its gorgeous, friendly interface design and open and collaborative business model. At the same time, Wi-Fi is a convenience. Agile and efficient WLAN transmission technology. Its emergence and development have greatly liberated the problem of limited mobile range of traditional network devices. Wi-Fi has been released since Android combined with the more popular Wi-Fi Direct technology on the market. Display features later on in the product. Discussion of wireless HD video transmission technology has never stopped. Wi-Fi. The 2.4GHz band network is due to the scarcity of spectrum resources and interference from other co-frequency wireless devices such as Bluetooth. In addition, in order to meet the need of real-time and stability of wireless high-definition video transmission. The reasonable choice of Wi-Fi channel in 2.4 GHz band is very important. Firstly, this paper briefly introduces the structure of Android system and the key technology knowledge in Android system. This paper studies the physical characteristics of Wi-Fi and the key type of MAC frame structure used in 802.11 protocol, and analyzes the technical structure and implementation principle of Wi-Fi part in Android system. This paper focuses on the code framework of wpa_supplicant, and analyzes the shortcomings of the current Wi-Fi Direct channel selection scheme in Android system. On the basis of the existing programs through the optimization of the design and compilation of Android source code. In the form of rewriting mobile phone Image file, Android phone has intelligent channel selection function. Finally, the comparison experiment of mobile phone device before and after optimization is carried out. Experimental simulation is carried out through the transmission of large capacity files in two different wireless environments, and the automatic selection of observation channels is carried out. The quality of Wi-Fi Direct communication is judged by the transmission rate and the transmission time. The analysis is made on the basis of the test results. The experimental results show that in the process of Wi-Fi Direct communication, the rate and stability of transmission can be greatly improved by realizing the intelligent channel selection. The innovation of this paper lies in. The modification of the system software is more flexible and iterative than the traditional hardware upgrade. Users can select the Wi-Fi Direct channel intelligently through the system upgrade.
【学位授予单位】：武汉邮电科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.53;TP311.52

【相似文献】