The fourth generation has been based on the development of the Internet in the air interface. The current Internet lacks the quality of service support. A previous contribution proposed the development of a new protoc...
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The fourth generation has been based on the development of the Internet in the air interface. The current Internet lacks the quality of service support. A previous contribution proposed the development of a new protocol (MIR: mobile ip reservation protocol), which provides quality of service guarantees to a mobile terminal [J. Benothman et al., 2000]. To show the benefit of this protocol we propose in this study to make performance evaluation of this protocol. Performance evaluation of this kind of network is difficult because we take into account a lot of parameters such as the cell number, buffer size for data, connection voice number in a cell, handover, etc. Thus the mathematical model associated to this network cannot be solved by a numerical method because of the size of the Markov chain, which is too large. In this study, we propose to use stochastic automata networks to make our performance evaluation.
The growth of the Internet has brought with it a tremendous volume of multimedia traffic, which is bursty in nature. Providing a required QoS as well as modeling multimedia traffic has been a challenging task. We tran...
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The growth of the Internet has brought with it a tremendous volume of multimedia traffic, which is bursty in nature. Providing a required QoS as well as modeling multimedia traffic has been a challenging task. We transcode multimedia data to cater for low bandwidth availability and different end-user requirements. We propose a protocol architecture which has been developed by the amalgamation of well-known components and which provides guaranteed multimedia communication over the Internet. We model multimedia traffic using the M/Pareto distribution in an attempt to represent realistic traffic patterns. We use the semantics of multimedia data-streams for rate adaptation transcoding to avoid network congestion and to ensure optimal use of network resources. The impact of transcoding the multimedia data to suit it to the network load and the end user requirements is also studied. Simulation results are presented and compared.
A number of distributed hash table (DHT)-based protocols have been proposed to address the issue of scalability in peer-to-peer networks. In this paper, we present Ulysses, a peer-to-peer network based on the butterfl...
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A number of distributed hash table (DHT)-based protocols have been proposed to address the issue of scalability in peer-to-peer networks. In this paper, we present Ulysses, a peer-to-peer network based on the butterfly topology that achieves the theoretical lower bound of (log n)/(log log n)on network diameter when the average routing table size at nodes is no more than log n. Compared to existing DHT-based schemes with similar routing table size, Ulysses reduces the network diameter by a factor of log log n. which is 2-4 for typical configurations. This translates into the same amount of reduction on query latency and average traffic per link/node. In addition, Ulysses maintains the same level of robustness in terms of routing in the face of faults and recovering from graceful/ungraceful joins and departures, as provided by existing DHT-based schemes. The performance of the protocol has been evaluated using both analysis and simulation.
This paper proposes a fair, rate-based end-to-end congestion control mechanism for multimedia traffic in packet switched networks such as the Internet. The scheme is modeled after a non-linear system. The congestion i...
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This paper proposes a fair, rate-based end-to-end congestion control mechanism for multimedia traffic in packet switched networks such as the Internet. The scheme is modeled after a non-linear system. The congestion is controlled by adjusting the transmission rates of the sources in response to the feedback information from destination such as the buffer occupancy, packet arrival rate and service rate, so that a desired quality of service (QoS) can be met. The QoS is defined in terms of packet loss ratio, transmission delay, power and fairness. The performance and stability of the system is analyzed mathematically. The proposed scheme has been implemented in the NS-2 simulator. Simulation results demonstrate the performance of the scheme to be in agreement with mathematical analysis. The proposed scheme is shown to provide considerable improvements in terms of the QoS metrics over New-Reno TCP technique.
This paper proposes a structure named Packet-Order-Keeping-Demultiplexer (POKD) and an efficient flow-classification-based packet-scheduling algorithm named FCS to solve the problem of maintaining packet disorder in t...
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ISBN:
(纸本)0769520332
This paper proposes a structure named Packet-Order-Keeping-Demultiplexer (POKD) and an efficient flow-classification-based packet-scheduling algorithm named FCS to solve the problem of maintaining packet disorder in the same flow for the parallel-structured router. The performances of POKD and FCS are analyzed.
This paper proposes a lossless audio coding scheme with hierarchical scalability in terms of sampling rate and amplitude resolution. A single bit stream contains hierarchical information that can generate waveforms ra...
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This paper proposes a lossless audio coding scheme with hierarchical scalability in terms of sampling rate and amplitude resolution. A single bit stream contains hierarchical information that can generate waveforms ranging from 96 kHz with 24-bit amplitude resolution through lower sampling/resolution lossless waveforms to a highly compressed lossy one created using an MPEG-4 audio coder. This bit stream structure enables dynamic rate control and hierarchical multicasting based on a simple priority control of the ip packets. These functions will be useful for high-quality archiving and broadband streaming for various types of networks and terminal equipment.
Recently, the self-similarity theory is a hot spot in correlative researches. And in this paper, we utilize the self-similar traffic to improve the results and performance of the intrusion detection based on artificia...
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Recently, the self-similarity theory is a hot spot in correlative researches. And in this paper, we utilize the self-similar traffic to improve the results and performance of the intrusion detection based on artificial immune system. The results of the simulation show that we achieved the high detection probability, the low miss probability, the low false alarm probability and the proper Hurst parameter.
We present a QoS-enhanced routing framework designed for an administrative system that runs a QoS-aware link-state routing protocol supporting MPLS. This routing framework is based on using only edge nodes and does no...
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We present a QoS-enhanced routing framework designed for an administrative system that runs a QoS-aware link-state routing protocol supporting MPLS. This routing framework is based on using only edge nodes and does not require any modifications at the core. The framework also does not employ any bandwidth reservation; instead, congestion is relieved by adaptive rerouting of aggregated traffic flows. Route oscillation is prevented by using randomization-based back-off techniques for triggering route changes. The proposed mechanism is distributed and non-cooperative, which makes it suitable for practical implementation. The results of simulations demonstrate that a significant reduction of packet drop ratio can be achieved with a moderate number of path shifts.
The migration of classic Internet to support real time and multimedia applications (videoconference, Voip) require improvement of the network level service. Since several real-time and multimedia applications are mult...
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The migration of classic Internet to support real time and multimedia applications (videoconference, Voip) require improvement of the network level service. Since several real-time and multimedia applications are multicast, our interest is to integrate Diffserv and multicasting in order to satisfy QoS requirements of the multicast group. The problem on which we are concentrating in this paper is related to providing QoS requirements for multicast applications using Diffserv and principally on overload traffic, which may be created by replication of multicast packets in Diffserv domain. In this case, the policing component in Diffserv routers may perform dropping packets and because core routers are working by aggregation, thus other traffic (the rest of traffic) may be affected. In this paper, we present a new protocol called control for QoS-based multicasting in Diffserv (CQMD) to resolve the multicast and Diffserv integration problem. This paper shows under what conditions the new member can be accepted into the multicast group in Diffserv domain. In addition CQMD can achieve QoS-satisfaction, ensure protection for other traffic in the Diffserv domain, good resources management and incur less message overhead.
The dramatic increase of Internet users and the development of new volume Internet applications has a profound impact on the design of next generation optical network (NGON) architectures. In order to cope with the im...
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The dramatic increase of Internet users and the development of new volume Internet applications has a profound impact on the design of next generation optical network (NGON) architectures. In order to cope with the immense diversity of applications and traffic volume, highly dynamic optical networks will be needed. PetaWeb, proposed by Nortel networks, is based on the use of adaptive core and edge switches, which can accommodate traffic fluctuations through periodic reconfiguration of channels. This increases the effective capacity of the network, reduces delay and delay jitter. We implement a simulation model of the PetaWeb architecture, verify the functionality of the PetaWeb and quantify its performance. Extensive simulation results are presented to quantify the benefits of agility. We have performed a thorough analysis how performance related parameters are affected by several factors, such as the reconfiguration frequency, the size and number of optical channels, as well as the buffer size of the edge node.
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