Analysis of CCSDS file delivery protocol: immediate NAK mode

Abstract

We analyze the Immediate NAK mode of the CCSDS File Delivery Protocol for the singlehop file transfer operation. We propose a timer setting rule that minimizes the expected time taken to transfer a file under the constraint that the throughput efficiency is maximized. Then, we derive the expected file delivery time and compare it with that of the Deferred NAK mode. The main contribution of this paper is the closed-form expression for evaluating the performance metrics.