Research And Development Of USB Module In The Software System Of HSDPA Wireless Network Card

HSDPA(High Speed Downlink Packet Access) is a kind of data service based on packet.It evolves from the 3G network of WCDMA and focuses on mobile data service which developed rapidly in recent years,and its best characteristic is the substantial promotion of utilization rate of network.HSDPA wireless network card is a kind of terminal device which can connect to the Internet through USB interface anywhere with the 3G network signals and implement the perfect integration between mobile communication and Internet.Therefore,there are important technology values and application prospects to research and develop HSDPA wireless network card.The article systematically researches and develops the software system of HSDPA wireless network card particularly USB module which can satisfy users' demands for the new function of USB module.Firstly,this article proposes and verifies the total design solution to the software system,analyses and introduces related hardware framework,Qualcomm AMSS6XXX software system and REX operating system,and verifies AT command practically.Secondly,this article intensively researches and analyzes the USB module,including USB specification,the total solution to USB module,the process of state switch between USB Mass Storage device and Modem device,and researches the implementation of U-disk in detail.At last,this article develops and implements the new function of USB module,including the function of USB CD-ROM,the concurrence function of USB CD-ROM and U-disk,and the concurrence function of USB Mass Storage device and Modem device.The total solution is implemented by C language based on AMSS6XXX software system.The experimental results verify the validity and reliability of the design scheme and result.The research outcomes of this article have already been applied to commercial software system of HSDPA wireless network card successfully and have acquired a good application effect.Therefore,this article has referential values to related technology and product development.