Estimating ADSL Link Capacity by Measuring RTT of Different Length Packets

Makoto AOKI
Eiji OKI

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.12    pp.3583-3587
Publication Date: 2011/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.3583
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
ADSL,  link capacity,  link rates,  bandwidth,  measurement,  ICMP,  

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This letter proposes a practical scheme that can estimate ADSL link rates. The proposed scheme allows us to estimate ADSL link rates from measurements made at the NOC using existing communications protocols and network node facilities; it imposes no heavy traffic overhead. The proposed scheme consists of two major steps. The first step is to collect measured data of round trip times (RTT) for both long and short packets to find their minimum values of RTTs by sending Internet Control Message Protocol (ICMP) echo request messages. The second step is to estimate the ADSL down- and up-link rates by using the difference in RTT between long and short packets and the experimentally-obtained correlated relationships between ADSL down- and up-link rates. RTTs are experimentally measured for an IP network, and it is shown that the down- and up-link rates can be obtained in a simple manner.