WiFi direct multi-hop mobile device file sharing method and system based on network coding

Abstract

The invention discloses a WiFi direct multi-hop mobile device file sharing method and system based on network coding, wherein, the method comprises the following steps: the source equipment selects the shared data to carry out fragmented network coding operation; The source device waits for a question and answer from other mobile devices; The mobile device successfully receives the data and sendsthe re-encoded data packets to other mobile devices. The mobile device can decode them to obtain the original data after receiving a certain amount of linearly independent data slices. The invention utilizes the mode switching strategy, can save the delay caused by the continuous switching of the equipment, thereby improving the distribution efficiency of the data in the system. By using the active re-coding strategy of intermediate nodes, the independence of data packets is enhanced, and the idle time is utilized to reduce the system delay, so that the overall performance of the system is improved. The invention has the advantages of stable data transmission and high data sharing rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a WiFi direct multi-hop mobile device file sharing method and system based on network coding. Background technique [0002] File sharing system is a typical application of file sharing technology on the Internet. The development of mobile devices makes such applications have broad development prospects. Nowadays, file sharing system based on mobile devices is a very popular application. However, when transferring files in a commercial 4G network, especially when there are many receiving ends, the communication fee will be very high, and the file owner will bear the high communication fee. When WiFi direct technology is adopted, users in the same area can save communication costs; in addition, users can obtain a higher sharing rate than commercial networks. Currently, WiFi direct is the ideal way for mobile device transmission and is widely supported ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the currently adopted passive network coding mode is not conducive to the independence of data between each device and the performance of real-time processing data needs to be improved, and at the same time it is easy to increase the time delay caused by the coding of intermediate nodes, providing a A WiFi direct multi-hop mobile device file sharing method based on network coding

Images