A Simultaneous Inline Measurement Mechanism for Capacity and Available Bandwidth of End-to-End Network Path

Cao LE THANH MAN
Go HASEGAWA
Masayuki MURATA

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B    No.9    pp.2469-2479
Publication Date: 2006/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.9.2469
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
Keyword: 
TCP,  capacity,  available bandwidth,  packet pair,  end-to-end measurement,  inline measurement,  

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Summary: 
We previously proposed a new version of TCP, called Inline measurement TCP (ImTCP), in [2],[3]. The ImTCP sender adjusts the transmission intervals of data packets and then utilizes the arrival intervals of ACK packets for available bandwidth estimation. This type of active measurement is preferred because the obtained results are as accurate as those of other conventional types of active measurement, even though no extra probe traffic is injected onto the network. In the present research, we develop a new capacity measurement function and combine it with ImTCP in order to enable simultaneous measurement of both capacity and available bandwidth in ImTCP. The capacity measurement algorithm is a new packet-pair-based measurement technique that utilizes the estimated available bandwidth values for capacity calculation. This new algorithm promises faster measurement than current packet-pair-based measurement algorithms for various situations and works well for high-load networks, in which current algorithms do not work properly. Moreover, the new algorithm provides a confidence interval for the measurement result.