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Low Extra Delay Background Transport (LEDBAT) congestion control algorithm is designed to address the unfairness problem of TCP aggravated by applications that use multiple TCP connections for data transfer. LEDBAT operates under the assumption that the queue delay at the access router of the bottleneck link will be the primary varying contributor to end-to-end one-way delay. However this assumption...
Since the IEEE 802.11 standard supports multiple data rates at the physical layer, many rate adaptation mechanisms have been proposed to utilize this multi-rate capability by dynamically switching rates in response to different channel conditions. In IEEE 802.11b networks, the guarantee of an equal transmission opportunity for all participating nodes results in performance anomaly. Traditional solutions...
The exact Markov modeling analysis of erasure networks with finite buffers is an extremely hard problem due to the large number of states in the system. In such networks, packets are lost due to either link erasures or blocking by the full buffers. In this paper, we propose a novel method that iteratively estimates the performance parameters of the network and more importantly reduces the computational...
We propose an innovative agile crossbar switch architecture called contention-tolerant crossbar, denoted by CTC(N). Unlike the conventional crossbar and the crossbar with crosspoint buffers, which require complex hardware resolvers to grant one out of multiple output requests, CTC(N) can tolerate output contentions by a pipelining mechanism, with pipeline stages implemented as buffers in input ports...
Multilayer MINs have emerged mainly due to the increased need for routing capacity in the presence of multicast and broadcast traffic, their performance prediction and evaluation however has not been studied sufficiently insofar. In this paper, we use simulation to evaluate the performance of multilayer MINs with switching elements of different buffer sizes and under different offered loads. The findings...
TCP-friendly congestion control is the key technique in next-generation-networks. An effective congestion control which uses the predominance of dynamic thresholds self- adaptive TCP-friendly congestion control (DATFCC) is proposed. The size of the receiver buffer butter was dynamically adjusted according to the state of the networks, the dropping probability was determined by the type and the size...
ATM, an ultimate solution of broadband-integrated service digital network (B-ISDN) to provide integrated multimedia services including voice, video, and data, has entered into the limelight with increased demand for such services. Hence, ATM is to be capable of supporting a variety of service classes and providing appropriate QoS according to classes. This may force us to sacrifice low priority traffic...
Along with the reactive routing algorithms of mobile ad hoc network (MANET), preemptive routing is a patch method which tries to warn the source node and to tell it to change route in time before a link is about to break Preemptive method was proposed to decrease packet losses and improve TCP performance in MANET. However, the precision of warning occasion is an important problem, and affects TCP...
Energy management is the key issue in the design and operation of wireless network applications like sensor networks, pervasive computing and ubiquitous computing where the network is primarily driven by battery-powered embedded devices. This paper studies network coding as an energy minimization technique. Network coding reduces the energy consumption by minimizing the number of transmissions required...
We develop and evaluate a new method for estimating and optimizing various performance metrics of multi-hop wireless networks, including MANETs. We introduce a simple approximate (throughput) loss model that couples the physical, MAC and routing layers effects. The model provides quantitative statistical relations between the loss parameters that are used to characterize multiuser interference and...
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