Data-Unit-Size Distribution Model with Retransmitted Packet Size Preservation Property and Its Application to Goodput Analysis for Stop-and-Wait Protocol: Case of Independent Packet Losses

TL;DR

This paper introduces a data-unit-size distribution model capturing the retransmitted packet size preservation property in stop-and-wait protocols with independent packet losses, and analyzes its impact on goodput in wireless networks.

Contribution

It presents a novel data-unit-size distribution model incorporating RPSP and derives a goodput formula considering this property in wireless stop-and-wait protocols.

Findings

RPSP significantly affects frame size distribution and goodput.

Longer maximum packet sizes increase retransmission due to RPSP.

Effects of RPSP intensify with higher bit error rates.

Abstract

This paper proposes a data-unit-size distribution model to represent the retransmitted packet size preservation (RPSP) property in a scenario where independently lost packets are retransmitted by a stop-and-wait protocol. RPSP means that retransmitted packets with the same sequence number are equal in size to the packet of the original transmission, which is identical to the packet generated from a message through the segmentation function, namely, generated packet. Furthermore, we derive goodput formula using an approach to derive the data-unit-size distribution. We investigate the effect of RPSP on frame size distributions and goodput in a simple case when no collision happens over the bit-error prone wireless network equipped with IEEE 802.11 Distributed Coordination Function, which is a typical example of the stop-and-wait protocol. Numerical results show that the effect gets stronger as bit error rate increases and the maximum size of the generated packets is larger than the mean size for large enough packet retry limits because longer packets will be repeatedly corrupted and retransmitted more times as a result of RPSP.