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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...
Congestion control can be regarded a distributed system, which consists of source algorithm like TCP, and link algorithm, such as active queue management (AQM). Shadow price has been derived from optimization theory to be implemented in routers as the AQM algorithm. In this paper, a control theoretic approach to analysis and design of the price is presented to enhance the AQM performance. We analyze...
Vertical handoff plays an important role in guaranteeing users to be always connected in an overlapped multi-network environment. During the vertical handoff procedure, handoff decision is the most important step that affects the normal working of communication. An incorrect handoff decision or selection of a non-optimal network may result in undesirable effects such as higher costs, poor quality...
This paper addresses the problem of service specification and mapping across providers, supposing centralized approach, via the third party agent that manages negotiation process in a group of domains. A general structure of the service specification form is suggested. It contains technical parameters related with a particular service request. Based on such general form, we further propose, implement...
Low voltage power lines are attractive for communications in smart metering, but they are subject to many kinds of interferences. One important source of interference is the one which is synchronous with the power network frequency. This noise shares the mean periodicity with the mains, but it also usually has some sort of time drift or jitter that shifts the position and phase of the signal from...
Estimating weight factors for QoS parameters plays an important role in the effectiveness of vertical handoff decision algorithms. This paper presents a novel weight estimation technique, which can adaptively control the spanning of the weights in response to user preference. Simulation results show the supremacy of the technique against the state-of-the-art in achieving wider spanning of the expected...
Providing a service with good quality for transmission and playing real-time voice conversations (voice streaming) over wireless ad-hoc networks is always a big challenge. Buffering and adjusting the playout time of packets is one of the methods used to overcome this challenge which can be deployed in receiver side. In this paper, a new adaptive playout adjustment algorithm to stream the voice conversations...
According to multimedia data transmission in multipath networks, a novel Multipath Video-on-demand Transmission (MVT) algorithm is proposed. With MVT model, video server marks control link and data link for data transmission. Furthermore, MVT forwards packets concurrently through multiple available paths. Compared with traditional schemes, MVT provides a more reasonable and a more flexible forwarding...
The transmission of Voice over Internet protocol requires signal processing for reliable & efficient performance over the computer and the communication platform. Speech quality, as perceived by the users of VoIP telephony, is critically important to the update of the service. Signal quality is degraded by network layer problems including delay, jitter and packet loss. The work presented in this...
The traditional adaptive Random Early Detection (RED) algorithm allows network to achieve high throughput and low average delay. However it uses a linear dropping probability function, which causes high jitter in the core router. To overcome the drawbacks of queue jitter in the traditional adaptive RED algorithm, this paper proposes a new Non-Linear Adaptive RED (NLAR) approach based on the Active...
Providing quality of service (QoS) guarantees in networks gives rise to several challenging issues. One of them is how to determine a feasible path that satisfies a set of constraints while maintaining high utilization of network resources. Multi-constrained QoS routing algorithm finds a feasible route in network that satisfies multiple independent constraints. In general, multi-constrained path selection...
This paper is the first to consider new uniprocessor task models motivated by the needs of reduction-based schedulability analysis techniques for distributed systems. Reduction-based analysis is a recent category of distributed system schedulability analysis techniques that reduces distributed real-time workloads to equivalent virtual uniprocessor ones for purposes of analysis using classical uniprocessor...
Scheduling messages with offsets is proved to be an effective method to reduce the Worst Case Response time (WCRT) for messages on the CAN bus. But there is no method available in related literatures except some commercial tools to calculate WCRT for messages with offsets. Conventional method assumes that a so-called critical instant exists, but it doesn't happen at most case. This paper proposes...
One of the main components of the next generation protected military satellite communication systems is dynamic bandwidth resource allocation (DBRA). A centralized DBRA algorithm on the satellite dynamically grants terminals time and frequency resources as their traffic demands and channel conditions change, leading to significant increase in the overall system throughput. This paper address one potential...
The Intelligent evolutionary algorithm-probability learning based algorithm is applied to multiple constraints Qos(Quality of Service) routing problem of network. The objective function is to minimize the cost and meet multiple constraints. The procedure and the choice probabilitypsilas update strategy of PBIL algorithm are designed according to the characteristics of multiple constraints Qos routing...
Congestion control is an important strategy to switches and routers, this paper proposes a novel congestion control algorithm based on active queue management, which control the buffer queue size by delay jitter. Simulation results show that the proposed algorithm outperforms these popular algorithms in quality of service and fairness.
This paper focuses on the avionics task partition scheduling under the FP-EDF scheduling strategy in which the operation system adopts fixed priority strategy and each individual partition adopts dynamic priority scheduling strategy. For the partition task worst-case response time, a more exact analysis algorithm was addressed through checking each release of tasks during the partition busy period...
A queue management algorithm, called ascending semi-Cauchy distribution and Hurst coefficients adaptive random early detection, CHARED for short, was proposed based on ascending semi-Cauchy distribution and real-time Hurst coefficients calculated by EBP. According to the Hurst coefficients of traffic, ascending semi-Cauchy distribution of the CHARED was modified by tuning the maximum of the packet...
Conventional priority-based queuing is regarded as one efficient way of imposing hierarchy on disparate traffic when it comes to delay, jitter, size etc... The basic method involves having multiple queues at the processing node, built atop a heap structure, to cater to different priority traffic. The latter is then channeled through the media, one queue/priority at a time in decreasing/increasing...
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