基于移动平台的文件传输策略的设计和实现

Design and implementation of a file transmission strategy based on mobile platform

提出了一种基于移动平台的文件可靠传输策略:发送节点采用与接收节点约定好的协议将文件内容按特定的长度进行分包,按特定的字段进行组包,按特定的数量进行分组;发送节点每传输一组数据包后都进行丢包的及时检查,只有等到接收节点接收了该组的全部数据包后才允许发送下一组数据包,直到所有数据包发送完毕;在传输过程中采用循环冗余校验(CRC)码对每个数据包进行校验,传输结束后采用哈希算法对整个文件的完整性进行校验,以增加文件传输的可靠性。实验结果表明,该文件传输策略能够同时减小链路开销、丢包率和传输时间。

A strategy for reliable transmission of files based on mobile platform is proposed below ： The sending node uses the protocol neogiated with the receiving node to subcontract the content of a file by a specific length, pack packets for the file by a specific field and group packets by a specific number; After sending a group of packets, the sending node timely checks whether any packets of the group are lost, and only after the receiving node receives all the packets of the group can the sending node send the next group of packets, with the sending continued until all the packets of the file are sent ; Using cyclic redundancy check （CRC） codes to check every packet during the transmission, and using the Hash algorithm to check the integrity of the file after the transmission to increase the reliability of transmission. The experimental results show that this strategy can simultaneously reduce the link cost, the packet loss rate and the transmission time.