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A New Approach
for Providing Quality of Service (QoS) in a Dynamic Network Environment
April 2000
Duncan Thomson, The MITRE Corporation
Nancy Schult, The MITRE Corporation
Mohammad Mirhakkak, The MITRE Corporation
ABSTRACT
This paper examines issues involved in providing Quality-of-Service
(QoS) support in a dynamic network environment. Sources of network dynamics,
in particular wireless links and mobile nodes, are discussed. The impact
of these dynamics on network layer QoS mechanisms are discussed to explain
the difficulties involved in attempting to apply these mechanisms in
such and environment. A new paradigm for providing resource reservation-based
QoS support is presented as a solution to some of the problems of providing
QoS in a dynamic environment. In this paradigm, resource reservations
represent ranges, and applications adapt to an allocated level of QoS
provided by the network at some point within the requested range. This
paradigm is explored in some detail, and is compared to related work
by other authors. Based on the new paradigm we define a new protocol
called dynamic Resource Reservation Setup Protocol (dRSVP). Finally,
we describe the experience we have gained through an implementation
of this protocol in a dynamic networking testbed environment, complete
with adaptive streaming video and audio applications (audio, video,
data transfer) running over the User Datagram Protocol (UDP). The paper
discusses our approach, testbed, experiences to date, and current plans.
Additional Search Keywords
Nomadic Network, Quality of Service, QoS, RSVP, Wireless, Dynamic Network,
Prototype
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