The circle travelling delay between OLT (Optical Line Terminal) and ONU (Optical Network Unit) is one of most important items in dynamic bandwidth allocation (DBA) algorithms in PON, called RTT (Round Trip Time). The RTT is taken into... more
We consider the combined control problem of connection admission, flow rate, and bandwidth allocation (capacity, service-rate) under nonstationary conditions. A fluid flow model in state variable form describes the time varying mean... more
In this paper we extend earlier results on combined control problem of connection admission, flow rate, and bandwidth allocation (capacity, service-rate) in ATM based networks under nonstationary conditions to the multiple node path case.... more
A novel wavelength and bandwidth allocation algorithm in WDM-EPON is proposed to provide subscriber differentiation by ensuring guaranteed bandwidth levels in the upstream direction. Contrary to previous schemes, the new algorithm is... more
A novel bandwidth assignment algorithm in WDM Ethernet Passive Optical Networks, called DyWaS-SLA, is proposed not only to provide service differentiation but also to offer subscriber differentiation. Simulation results show that... more
A novel interleaved polling algorithm for Long-Reach EPONs is proposed in order to simultaneously provide subscriber and class of service differentiation. It is demonstrated that the new polling algorithm applied to a typical 100 km... more
A novel bandwidth assignment algorithm in Ethernet Passive Optical Networks with different coverage, called DySGAB, is proposed to provide subscriber differentiation. In contrast to algorithms which allocate bandwidth based on fixed... more
In this article, a new dynamic bandwidth allocation algorithm for the upstream channel of Ethernet Passive Optical Networks, called DySLa, is proposed not only to provide service differentiation but also to offer subscriber... more
The study and understanding of the social behavior of insects has contributed to the definition of some algorithms that are capable of solving several types of optimization problems. In 1997 Di Caro and Dorigo developed the first routing... more
Bandwidth reservation has been increasingly used in high-performance networks to provide Quality of Service (QoS) for various applications ranging from real-time multimedia communication in early years to big data transfer more recently.... more
Depending on the flexibility in controlling the transmission rate and the differences between on-line (real time) and off-line transmission modes, multimedia applications can potentially include a wide range of services, with the... more
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The purpose of Resource Management is the efficient and effective use of network resources, for instance bandwidth. In this article, a connection oriented network scenario is considered, where a certain amount of bandwidth is reserved for... more
We consider the problem of resource allocation in a substrate network and suggest a simulation scheme for dynamically adaptive bandwidth allocation protocols using CPN (Coloured Petri Nets) Tools. The proposed simulation scheme based on... more
We analyze some issues of network design and bandwidth allocation in telecommunication systems with congestible resources. The work is closely related to network monitoring and traffic measurement functions that must be carried out on... more
Customers of virtual private networks (VPN) over differentiated services (Diffserv) infrastructure are most likely to demand not only security but also guaranteed quality of service (QoS) as there is a desire to have leased line like... more
In this paper, we propose a Frequency Domain Equalizer (FDE) without inserting the Guard Interval (GI) at the transmitter which is applicable to the Wide-band Code Division Multiple Access (WCDMA) and Orthogonal Frequency-Division... more
Evaluating extensions to IMS session setup for multicastbased many-to-many services. Computer Networks, 55(3), pp. 600-621.
To be fair or efficient or a bit of both. Originally published in Computers & Operations Research, 35(12),[3787][3788][3789][3790][3791][3792][3793][3794][3795][3796][3797][3798][3799][3800][3801][3802][3803][3804][3805][3806]
In order to bridge the speed disparity at the LAN-WAN interface, enterprises install a number of policy-based devices to enforce administrative policies over the WAN access. The conventional techniques of bandwidth management concentrate... more
Bandwidth allocation techniques for control loops closed over communication networks are based on static strategies that ensure average control performance at the expense of permanently occupying the available bandwidth. We present a... more
The paper formalizes the bandwidth allocation process as a Multi -Objective Programming (MOP) problem, revises an algorithm already in the literature (identified as ABASC) in the framework of the MOP and proposes a novel scheme (called... more
Next-generation Internet infrastructures have two specific macroscopic requirements: ubiquity and quality of service guarantee. Satellite and wireless systems can easily guarantee ubiquity but, due to noise and fading, they may fail... more
The paper studies the performance of possible bandwidth allocation criteria over satellite network. The methods practically implemented in a simulation framework and evaluated are the "Value Function" (VALUE), the "Nash Bargaining... more
This paper presents a network traffic measurement study of Desire2Learn (D2L), which is the Learning Management System (LMS) used by the University of Calgary. Our study is motivated by anecdotal reports of sluggish D2L performance,... more
This paper examines the attributes of TCP tunnels which are TCP circuits that carry IP packets and benefit from the congestion control mechanism of TCP/IP. The deployment of TCP tunnels reduces the many flows situation on the Internet to... more
Backbone routers typically require large buffers to hold packets during congestion. A thumb rule is to provide a buffer at every link, equal to the product of the round trip time and the link capacity. This translates into Gigabytes of... more
We introduce the discrete Green's function to elucidate how resource fluctuations determine flow fluctuations in a network optimizing a global cost function. To enhance the robustness of the network against fluctuations, we develop the... more
We introduce the discrete Green's function to elucidate how resource fluctuations determine flow fluctuations in a network optimizing a global cost function. To enhance the robustness of the network against fluctuations, we develop the... more
Bandwidth allocation plays a crucial role in ensuring overall quality of service in WiMAX. WiMAX supports non-contention based bandwidth allocation mechanism, where the responsibility of bandwidth allocation lies with the base station. In... more
Digital Nyquist-WDM is experimentally demonstrated using RSOA-based colorless ONUs, providing a 6-fold enhancement of transmission capacity through 25km fiber, and showing digital Nyquist-WDM as promising candidate for cost-effective... more
Multi-band elastic optical networks are a promising alternative to meet the bandwidth demand of the ever-growing Internet traffic. In this letter, we propose a family of band allocation algorithms for multi-band elastic optical networks.... more
Cloud Radio Access Network (Cloud RAN) is one of the most promising mobile architectures for 5G networks. The basic concept of Cloud RAN is to separate the digital baseband processing units (BBUs) of conventional cell sites, from the... more
Cloud Radio Access Network (Cloud RAN) is one of the most promising mobile architectures for 5G networks. The basic concept of Cloud RAN is to separate the digital baseband processing units (BBUs) of conventional cell sites, from the... more
Large-scale not-for-profit Internet Service Providers (ISPs), such as National Research and Education Networks (NRENs) often have significant amounts of underutilized bandwidth because they provision their network capacity for the rare... more
The stability properties of the bandwidth allocation algorithm First Fit are analyzed for some distributions on the sizes of the requests. Fluid limits are used to get the ergodicity results. When there are two possible sizes, the... more
Department of Electrical Engineering, The City College and The Graduate School and University Center of the City University of New York, NY, USA, {antonis, sherif, akhalil, tanvir, gellinas, marend, ali}@ee.ccny.cuny.edu ... Department of... more
We present a new Traffic engineering (TE) model which is based on QoS rerouting and uses hybrid resilience to improve the recovery performance of multi-layer networks where an MPLS network is layered above an MPλS network. We formulate... more
The reliable and efficient transmission of highquality variable bit rate (VBR) video through the Internet generally requires network resources be allocated in a dynamic fashion. This includes the determination of when to renegotiate for... more
For the last several years, there has been a significant increase of interest in supporting quality of service (QoS) constraints in Mobile Ad Hoc Networks (AHNs). AHNs include mobile nodes with limited capacities and communication... more
This paper introduces an analytical method for approximating the performability of a firm realtime system modeled by a multi-server queue. The service discipline in the queue is earliestdeadline-first (EDF), which is an optimal scheduling... more
In cellular networks, it is vital to allocate communication channels efficiently because the bandwidth allocated for cellular communication is limited. When mobile hosts move from one cell to another cell, to provide uninterrupted... more
In cellular networks, it is vital to allocate communication channels efficiently because the bandwidth allocated for cellular communication is limited. If channels are statically allocated, as is the case in current cellular networks, a... more
We consider two capacity problems in P2P networks. In the first one, the nodes have an infinite amount of data to send and the goal is to optimally allocate their uplink bandwidths such that the demands of every peer in terms of receiving... more
Smart devices such as smartphones and tablets are used extensively in public spaces for the transmission and reception of content in the form of text, photos and streaming videos. Since the bandwidth provided for wireless access is... more
Recently, Internet Engineering Task Force (IETF) has been considering the deployment of the Random Early Detection (RED) [5] in order to avoid the increasing of packet loss rates caused by an exponential increment of network traffic and... more
This paper presents a new end-to-end available bandwidth measurement tool called IGMPS (Improved Gap Model using Packet Size parameter). IGMPS is a lightweight tool based on a new deterministic model of packet delays derived from the... more
We consider rate allocation for video users in the case where the available bandwidth fluctuates. Simply minimizing the objective distortion or optimizing the stability of video qualities does not optimize subjective quality. We formulate... more