| Summary: | 碩士 === 國立交通大學 === 資訊工程學系 === 84 === Asynchronous transfer mode (ATM) networks provide large
bandwidth and supportdiverse traffic characteristics as well as
multiple quality of services (QoS)requirements in a single
integrated environment. These different types of traffic are
statistically multiplexed to efficiently utilize the network
bandwidth. However, most of the data networking applications can
not predict their ownbandwidth requirements, such data
applications usually require a service thatdynamically shared
the available bandwidthamong all active connections and
isreferred to as a best-effort service or available-bit-rate
(ABR). Since the traffic is usually bursty and unpredictable,
the traffic control for ABR service poses more challenge than
other services. The ABR traffic control mechanism is required to
provide an efficient statistical sharing of available
bandwidthamong all active connections. The actual transmission
rate of ABR traffic must be dynamically regulated according to
the network statistical information toimprovethe bandwidth
utilization. This paper presents an ABR traffic control approach
which combines a new end-to-end rate control with link-by-link
feedback control. The new rate control can regulate the
transmission rate of source traffic dynamically and keep the
real fairness among all active connections. Abuffering scheme
based on feedback control that avoids Head-of-Line (HOL)
blocking for the best-effort (ABR) traffic is used. The
simulation results show that the proposed ABR traffic control
can achieve cell-loss-free, maximum link utilization, and
fairness.
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