Design, implementation and validation of a receiver-driven less-than-best-effort transport

LEDBAT++ is a congestion-control algorithm that implements a less-than-best-effort transport service. In this paper we present rLEDBAT, a purely receiver-based mechanism to implement LEDBAT++ for TCP. rLEDBAT enables a receiver to select some incoming traffic as less-than-best-effort, managing the capacity of the downlink. We describe the different mechanisms composing rLEDBAT that enable the execution of the LEDBAT++ congestion control algorithm at the receiver. We have implemented and experimentally tested rLEDBAT. We validate that the mechanisms incorporated by rLEDBAT at the receiver are indeed effective to implement a less-than-best-effort transport service at the receiver, as it performs similarly to the original sender-based LEDBAT++. ; This work has been partially supported by the EU EC through the STANDICT-CCI project, Grant 951972. Funding for APC: Universidad Carlos III de Madrid (Read Publish Agreement CRUE-CSIC 2022). All authors approved the version of the manuscript to be published.