Mobility Investigate

On the Fairness of Transport Protocols in a Multi-Path Environment

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Executive Summary

Today, a steadily growing number of devices contains multiple network interfaces. For example, nearly all Smartphones are equipped with at least W-LAN as well as 3G/4G interfaces. In consequence, there is a rising demand for so-called multi-path transfer, which utilizes all of these interfaces simultaneously in order to maximize the payload throughput of applications. Currently, this so-called multi-path transfer is very actively discussed by the IETF, in form of the Multi-Path TCP (MPTCP) extension for TCP as well as the Concurrent Multi-path Transfer extension for SCTP (CMT-SCTP). Their larger-scale deployment in the Internet is expected for the near future.

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