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Performance comparison of various Packet Scheduling (PS) algorithms such as Proportional Fair (PF), Maximum Largest Weighted Delay First (MLWDF) and Exponential/Proportional Fair (EXP/PF) has been studied in HetNets environment. The performance indicators such as throughput, Packet Loss Ratio (PLR), delay and fairness are considered to judge the performance of the scheduling algorithms. Various strategies...
This paper proposes a QoE (Quality of Experience) assessment model which can estimate voice and video quality. Based on the proposed model, speech or video quality is calculated with regard to policies applied for packet processing by routers and to the level of total network utilization. The contribution of this paper lies in designing a new computational model capable of predicting the quality of...
Quality of Service (QoS) based scheduling in Cognitive radio networks (CRN) is a pressing research problem. The objective of this work is to study the feasibility of using CRN for delay sensitive applications in the presence of primary users with random ON/OFF periods. The first contribution of this work is the modeling of a cognitive node as a Queuing system and characterization of the average delay...
Real-time (RT) communication support is a critical requirement for many complex embedded applications which are currently targeted to Network-on-chip (NoC) platforms. In this paper, we present novel methods to efficiently calculate worst case bandwidth and latency bounds for RT traffic streams on wormhole-switched NoCs with arbitrary topology. The proposed methods apply to best-effort NoC architectures,...
Traditionally in routing approaches, each node allows a maximum load through the selected route. The existing routing approaches in cognitive radio networks (CRN) do not take into account spectrum trading as well as spectrum competition among licensed users (PUs). This paper introduces a novel routing algorithm that is based on spectrum trading and spectrum competition for cognitive radio networks...
Due to the coexistence of different generations of mobile radio technologies, more and more mobile network operators are keen on deploying multiple radio technologies on a single cell site and carry their traffic over a common transport network. This paper studies such a collocated multiradio system: collocated LTE and HSDPA. Firstly, we investigate the potential gain by using a shared transport network...
The configuration of WLAN MAC by means of Super Frame (SF) and Contention Free Period (CFP) variation is one of the effective schemes to provide QoS to interactive multimedia (IMM) traffic. In this paper we investigate the usefulness of an auto-generated dynamic parameter set of CFP and SF combinations as the logical look-up table for the WLAN medium access control scheme. A modified analytical model...
For scheduling services with different features and Qos constraints, this paper proposes a hybrid scheduling strategy, in which delay-sensitive services are granted preemptive priority and non-delay-sensitive services are granted non-preemptive priority. Theoretical analysis verified that preemptive scheme results in longer waiting length of queue.
One of the limitations of using Service Oriented Architecture (SOA) in mission critical applications (like Air Traffic Control) is the ability to specify stringent Quality of Service (QoS) parameters for individual services. Even determining which Message Broker optimizations to utilize to achieve high QoS is difficult. This research is utilizing the concepts introduced by the Queuing Network Analyzer...
In this paper, the scheduling problem of the network with limited bandwidth is considered. In order to improve the network quality of service and the quality of control simultaneously, an intelligent feedback scheduling method is proposed. The scheduler reschedules the priority, the sampling period, and the output threshold concurrently according to the control authority of each node, which is calculated...
The delay sensitive industrial control applications like Industrial process control, Environmental control, Gas leakage monitoring, etc. in this a reliable communication between sensor and base station are highly essential. Wireless Sensor Networks (WSN) becomes an immensely popular technology in such application as it offers low latency and high energy-efficiency in message transmission. Life span...
Both of Quality of Service (QoS) and Quality of Experience (QoE) are defined to specify the degree of service quality. Although they are dealt with in different layers in multi-layered models, collaboration of these is necessary to improve the user satisfaction for telecommunication services. In this paper, after sorting out the concepts and specification of QoS and QoE, a service quality coordination...
In this paper, we consider a cognitive relaying network in which the secondary user accesses the channel with a certain access probability that depends on the feedback information sent by the primary destination. In addition, the secondary user is granted relaying capabilities by which it can relay primary traffic that was unsuccessfully transmitted by the primary user. We show that this proposed...
IP Multimedia Subsystem (IMS), an architectural framework for delivering multimedia services standardized by Third Generation Partnership (3GPP/3GPP2), is deployed as part of 3G and beyond wireless networks. It facilitates wireless carriers to offer rich multimedia services such as Chat, Presence, and Video Conference with a high degree of flexibility. These services vary in terms of their delay sensitivity...
The most important tendency of future Internet architectures is maintaining the best Quality of Experience (QoE), which represents the subjective perception of end-users using network services with network functions such as admission control, resource management, routing, traffic control, etc. Among of them, we focus on routing mechanism driven by QoE end-users. Nowadays, most existing routing protocols...
The key focus of our work is to analyse some jitter control algorithms. We study a jitter control algorithm proposed by Mansour et. al [1] for networks with guaranteed quality of service (QoS) from a competitive analysis point of view. The authors have analysed the proposed algorithm (on-line algorithm) and also compared its performance to the off-line algorithm. In this paper, the analysis of the...
In this paper, classical feedback control theory is used to contribute two types of QoS guarantees, relative delay guarantee ( RDG) and absolute delay guarantee (ADG). RDG aims to maintain the average queuing delay ratio between different classes of requests according to pre-specified parameters, and ADG aims to ensure the average queuing delay for requests with high priority is no more than the threshold...
Wireless sensor networks (WSN) are a kind of networks made up of thousands of tiny nodes. The node in WSN has limited computing, caching and communicating ability. Because of these differences from normal lineal networks, there are many research hotpots for quality of service (QoS) in WSN. The target of most WSN is to detect events and it pays more attention to the QoS of colony data packets. So,...
In this paper, we examine the energy-performance tradeoff for the sleep window adjustment in duplex VoIP transmissions. Specifically, we modified the traditional analysis model by giving a new mathematical model to analyze the performance of the sleep scheme, with the natural talking speed, sleep window size, energy expenditure taken into consideration. Guided by this model, we locate the optimal...
QoS support in MANETs is challenging because of unfavourable conditions such as a dynamic topology, limited bandwidth and energy constraints. In the past decade, significant effort has been devoted to QoS routing design which fails to obtain a one-for-all solution for MANETs. This reason, it is believed, is the application dependent nature of routing protocols. Moreover, few researchers consider the...
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