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Browse Prior Art Database

Determination of Bandwidth and Latency in a Multimedia Communicaiton Environment

IP.com Disclosure Number: IPCOM000111138D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Wilson, D: AUTHOR

Abstract

Disclosed is a statistical technique for determining the transmission delay and bandwidth being achieved on a communications network link.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Determination of Bandwidth and Latency in a Multimedia Communicaiton
Environment

      Disclosed is a statistical technique for determining the
transmission delay and bandwidth being achieved on a communications
network link.

      In an environment where multimedia data is being communicated,
knowledge of the available communication channel bandwidth and
throughput delay for transmitted data is vitally important to an
application.  Data such as real time digital video will require a
minimum communication bandwidth for acceptable display.  Delay
information will also be required to allow synchronisation with an
audio data stream possibly being transmitted via other means.
Depending upon the available bandwidth, the application may also
choose between several data compression methods allowing speed
optimisation.

      In traditional communications, the concept of bandwidth is
intimately tied to the communications hardware (e.g., 9600bps async
lines, 4M Token Ring) but upon moving into the area of multipoint,
multimedia desktop conferencing where applications are insulated from
knowledge of the communications network topology and where data may
be relayed across several network types between transmission and
reception, these raw hardware figures become of little value.  The
problem is further compounded under multitasking operating systems
where a communicating application is likely to see variations in its
effective transmission rate due to processor resource being allocated
to competing applications.  Another application taking processor
bandwidth will reduce the amount of time allocated to the multimedia
transmitting process resulting in an increased throughput delay or
reduced communication bandwidth from its perspective.

      The technique here described provides a simple method allowing
two communicating applications to characterise the effective
communications bandwidth and throughput delay between them,
independently of the actual communications links in use and the
software beneath the application.  Using the following method, an
instantaneou...