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Current trends show an increasing number of Dedicated Channels having a Small number of Viewers (DCSV for short) in multi-channel live streaming systems. Usually, DCSV channels are either user generated or dedicated channels and they suffer adversely from poor channel performance, mainly, due to having a small number of participants. As a result, when a viewer explicitly requests for a block of streaming...
One of the issues with the use of satellite communications (SATCOM) in tactical networks is the disconnection between the planning and management of the satellite networks and the network operations including planning and management of the deployed tactical network. This paper attempts to bridge this gap, addressing how the router interface connected to a satellite terminal can be configured to optimize...
In this paper, an innovative TCP flow control method is presented. An algorithm is proposed that combines RED (Random Early Detection) with TCP window adjustment to improve the network performance. Leveraging the advantages of RED and window adjustment, the algorithm demonstrates fast response and superior stability with controlled packet dropping rate, while still fully utilizing the network resource...
Nowadays, with the evolution of the mobile devices towards a multimode architecture, the users have the opportunity to utilize a wealth of services across a multitude of radio access technologies (RAT's). Variety of vertical handoff algorithms (VHA) have been proposed to help the user to select dynamically the best access network (BAN) in terms of quality of service. However, due to nature of VHA...
This paper demonstrates the effectiveness and robustness of amplifier finite gain bandwidth compensation within a wideband third order continuous time delta sigma modulator and the effects of process, mismatch and temperature on modulator stability. In many state of the art designs, GBW is kept safely above the sampling frequency of the modulator, which suffers a power penalty especially for high-speed...
The character of the input flow changes with an increasing amount of multimedia services. The most common classical stochastic models suppose an exponential distribution of interarrival times, i.e. the Poisson input flow. This paper shows the significant influence of probability distribution functions of interarrival times, such as the exponential, the hyper-exponential and the Erlang's of the order...
To improve driving comfort and provide entertainment services, vehicular communication networks (VCNs) have appeared as an emerging solution, which consists of road-side units (RSUs) and on-board units (OBUs) to distribute multimedia contents. However, as most of OBUs always request the stored contents in the RSUs, how to update the contents in these RSUs when the original changes at its original...
The widespread deployment of optical interconnects in data centers has renewed the interest in multimode fiber communications. Due to the complexity of modern transmission techniques, performance analysis relies on numerical simulations that require an accurate channel model to reflect reality with the needed precision. As there is no standard model for channel simulation, we investigate a deterministic,...
In the present literature, the delay line (DL) in transmitted-reference (TR) system is supposed to be ideal. However, it is in fact impossible to design a DL with perfect phase-frequency characteristic. In this paper, based on the statistical model of group delay ripple (GDR) of the non-ideal DL, we investigate the degradation of average bit error rate (BER) for TR UWB communication system. Through...
In this paper, we propose a general model for the broadcast polling protocol of unsaturated IEEE 802.16 networks in which each subscriber station has a finite buffer. A subscriber station can be modelled as a M/G/1/K queue with its service time determined by the broadcast polling protocol. The buffer overflow probability, network throughput and packet delay performances are analyzed. The proposed...
End-users are anticipated to have more freedom in dynamically connecting to any service provider for any service through their multi-mode terminals in the next generation heterogeneous integrated networks. This paper proposes a novel analytical framework of such a mechanism, which allows a user to freely determine one of the selection criteria, and to freely select one of the accessible networks to...
In recent years, Vehicle Ad Hoc Networks (VANETs) have become very popular. A typical VANET defines an intelligent way of using vehicular networking by integrating vehicular connections via a number of short-distance ad-hoc networking links, such as the IEEE802.11p. This type of system could provide effective communication between moving vehicles and fixed Road Side Units (RSUs), which are usually...
Processor cores in a chip multiprocessor (CMP) typically share a large last-level cache and the off-chip memory bandwidth. Previous studies demonstrate that explicit cache capacity and off-chip bandwidth partitioning can yield better overall system performance than without partitioning. However, little work has been done to study the interaction between cache capacity partitioning and off-chip bandwidth...
Vehicular ad hoc networks (VANETs), which are a class of Mobile ad hoc networks, have recently been developed as a standard means of communication among moving vehicles. Since VANETs are vital to the safety of the vehicles, the infrastructure, and the humans involved, a deep analysis of their potential behaviours is clearly required. In this paper we provide this analysis through the use of formal...
The existing IEEE 802.16 is a series of Wireless Broadband standards known as WiMAX as an important technology for providing high-speed Internet access to home and business subscribers in a wide area cellular network. It has defined real time and non-real time services. But the standard does not specify transmission scheduling schemes to support the services. In order to support the delay sensitive...
This paper proposes a novel combination of ECN and BECN based on the value of the TTL, the hops that a packet has been passed since it was sent. Since the ECN and the BECN both have merits and disadvantages, the combination would be expected to enhance the performance and effectiveness of the congestion control. The TTL, a default attribute of a data packet transferring on networks, must be checked...
This paper proposes an analytical model for dimensioning transport bandwidths in the Long Term Evolution (LTE) access network. In this work the criterion for dimensioning is the transport network delay QoS (at the packet level). The presented analytical model takes into considerations the key features of the LTE radio interface and the use of Differentiated Service (DiffServ) QoS scheme in the LTE...
The ability to deal with the requirements and preferences of mesh clients and their applications is still left aside in the recent trends for Wireless Mesh Networks (WMNs). In this paper, we split a WMN into a multitude of logical networks through virtualization, each one appropriate to specific levels of context features, e.g., security and cost preferences, mobility, and applications' requirements...
This paper proposes a new scheduling algorithm for IEEE 802.16-2005 Broadband Wireless Metropolitan Area Networks in TDD mode. The proposed algorithm focuses on solving the problem of handling high priority traffic in congested networks while minimizing starvation conditions for other served classes. In this work, a detailed simulation study is carried out for the proposed scheduling algorithm as...
In IEEE 802.16 networks, bandwidth allocation is centralized at the base station (BS). For the uplink traffic, data transmission is scheduled after the BS processes bandwidth requests (BW-REQs) sent by mobile stations (MSs). In this paper we focus on the multicast/broadcast polling method, where MSs send their BW-REQs during contention periods. Contention-based polling is deemed suitable for Best-Effort...
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