Large File Transmission Using Self-Adaptive Data Fragmentation in Opportunistic Networks

Delivery ratio of large file transmission in opportunistic networks is low for the characteristics of opportunistic networks. In order to improve the ability of transferring large files, a kind of data fragmentation strategy is proposed in this paper: self-adaptive data fragmentation (SADF). The size of data fragment in SADF is based on historical statistic transmission rate and historical statistic connection duration between communicating nodes. The SADF strategy makes full use of current networking connection, minimizing the overhead caused by fragmentation control information. Simulation results show that the proposed fragmentation strategies can improve delivery ratio of large file greatly.