Title :
Analysis by queuing model of multi-threshold mechanism in ATM switches
Author :
Benaboud, Hafssa ; Mikou, Noufissa
Author_Institution :
CUI, Geneva Univ., Switzerland
Abstract :
In this paper, we present a queuing model for a congestion control mechanism in ATM (asynchronous transfer mode) switches for ABR (available bit rate) services. ABR services are designed to support applications that are loss sensitive but tolerant to delay. ABR sources dynamically adjust their transmission rates in response to congestion feedback from the network, and according to a congestion control algorithm which is implemented in ATM switches such as EFCI (explicit forward congestion indicator) and ER (explicit rate) algorithms. Our mechanism, named "multi-threshold mechanism", has a behaviour similar to the one of the EFCI algorithm but it allows switches to adjust dynamically their input rates as well as their output rates according to different thresholds of their buffer size. The multi-threshold mechanism is modelled in this paper by a queue M/M/1 where input and output rates are controlled. Steady state probabilities as well as mean waiting time and queue average length are given.
Keywords :
asynchronous transfer mode; buffer storage; queueing theory; telecommunication congestion control; ABR services; ATM switches; EFCI; ER algorithm; asynchronous transfer mode; available bit rate services; buffer size; congestion control; congestion feedback; explicit forward congestion indicator; explicit rate algorithm; input rates; mean waiting time; multi-threshold mechanism; output rates; queue average length; queuing model; steady state probabilities; transmission rates; Asynchronous transfer mode; Bit rate; Communication system traffic control; Electronic mail; Feedback; Quality of service; Queueing analysis; Switches; Telecommunication traffic; Traffic control;
Conference_Titel :
High Speed Networks and Multimedia Communications 5th IEEE International Conference on
Print_ISBN :
0-7803-7600-5
DOI :
10.1109/HSNMC.2002.1032565
