LTP asynchronous accelerated retransmission strategy for deep space communications

Abstract

To describe the transmission performance of LTP protocol more intuitively and accurately, it is an original work to model the transfer procedure of a single LTP session, and analyze the expected file delivery time of a data block theoretically. In order to improve the data transmission efficiency in extreme long and error-prone deep space links, an asynchronous accelerated retransmission strategy triggered by the receiver during the course of the red-part original transmission is proposed for recovering the missing data segments sooner. The asynchronous accelerated retransmission process in deep space environment is modeled, and the theoretical expression of the expected file delivery time based on the proposed strategy is derived. The performance of strategy is analyzed by numerical simulations under the Mars to Earth scenario. The strategy is verified to accelerate the retransmission process, effectively shorten the file delivery time and improve the efficiency of file transmission.