适用于混合业务类型的两步法ATM网络VP带宽动态管理策略的研究

介绍了一种适合于混合业务类型，非均匀业务流两步长ＶＰ动态带宽管理策略，分析了宽管理策略的带宽利用率，连接阻概率和带宽分配处理负荷。对其进行了计算机模拟仿真，并与固定步长动态带宽管理策略进行了分析比较。     

ATM网络VP带宽动态管理策略的研究

文章介绍了一种适合于混合业务类型、非均匀业务流两步长VP动态带宽管理策略，分析了带宽管理策略的带宽利用率、连接阻塞概率和带宽分配处理负载，对其进行了计算机模拟仿真，并与固定步长动态带宽管理策略进行了分析比较。     

局域网仿真建模技术研究

本文以ＧＰＳ仿真语言为基础，结合ＣＳＭＡ／ＣＤ－Ｔｏｋｅｎ综合业务局域网实例地局域计算机仿真建模技术进行了系统研究，文中提出了建模策略具有普遍适用性，该研究用助于提高局域网仿真建模的质量和效率。     

基于OPNET Modeler的UMTS性能分析仿真平台

随着计算机性能和仿真技术的提高,计算机仿真技术得到越来越广泛的运用.OPNET是一种具有高可靠度的网络建模、设计、仿真和分析工具.文中主要介绍了基于OPNET建立的UMTS仿真平台,并基于该平台研究了UMTS网络典型业务端到端的关键性能参数,以及根据业务服务质量的需求提供不同等级服务的可行性.仿真结果表明,该系统级仿真平台对UMTS系统的性能分析是有效的,为网络的规划设计提供客观、可靠的定量依据.     

无线移动信道的仿真模型分析

通过对无线移动信道衰落特性的分析，建立了数学模型和计算机仿真模型，并对计算机仿真结果进行了分析，得出了相应结论。     

UWB信道的计算机仿真实现及其性能分析

本文针对UWB小尺度衰落信道的仿真，介绍了信道的计算机仿真模型，给出模型仿真参数的选取，并通过计算机仿真分析了模型实现的性能，验证仿真模型在UWB信道仿真中的可行性。     

数字集群系统容量研究和分析

本文通过对数字集群系统主控信道负荷的研究，分析了数字集群系统主控信道的效率，并据此给出了几种改进主控信道效率的方法。同时对于一个典型集群系统的业务容量进行了计算机信真研究，并对理论值和仿真研究结果得出的一个基站的用户容量进行了比较。     

具有业务量平滑功能的ATM交换机的性能分析

ＡＴＭ网络支持大量的突发业务源。突发业务量可用间断Ｂｅｒｎｏｕｌｌｉ过程描述。本文采用一种循环算法，分析了ＡＴＭ交换机在既有连续比特流业务量又有突出业务量环境下的信元丢失率和平均延迟。数值分析结果和计算机仿真结果一致表明，具有业务量平滑功能的ＡＴＭ交换机的性能有较大改进，。     

长途电信网的计算机仿真分析

本文对电信网络的仿真原理进行了讨论，介绍了一种根据马尔可夫法建立的电信网计算机仿真系统，并利用此系统对长途电信网的一些网络行为进行了计算机仿真，并通过对仿真结果的分析，得出一些重要结论。     

WDM光网络中动态RWA算法仿真的实现

在WDM光网络中，在给定一组连接请求后，需要为之建立路由并分配波长，这被称为路由和波长分配问题（RWA）。由于当前光网络中的业务呈现爆炸式的增长，而光网络中的可用资源却是有限的，因此如何使用合理的RWA算法来优化网络资源的利用就显得尤为重要。目前已有很多文献提出了基于各种优化目标的RWA算法，也都通计算机仿真的方法测试和评估了算法的性能。计算机仿真是进行算法性能评估的主要手段，但是关于算法仿真的实现，—般的文献都涉及的很少，本文主要研究了WDM光网络中动态RWA算法计算机枋真的实现。     

New modelling strategy for representing asymmetric traffic loads on LANs

A new technique for modelling asymmetric traffic load distributions on local area networks (LANs) is presented. The traffic model which is analytical and easy to implement into discrete event computer simulations also has the benefit of providing expressions for the higher mathematical moments of the traffic load distribution.<>     

适用于混合业务类型的两步法ATM网络VP带宽动态管理策略的研究

本文介绍了一种适合于混合业务类型、非均匀业务流两步长ＶＰ动态带宽管理策略,分析了带宽管理策略的带宽利用率、连接阻塞概率和带宽分配处理负载。对其进行了计算机模拟仿真,并与固定步长动态带宽管理策略进行了分析比较     

Analysis of an ATM multiplexer under self-similar traffic

Recent empirical studies of the real traffic measurement show that the traditional traffic models cannot capture the character of long-range dependence of the traffic. And many computer simulations said that this character has large influences on the network performance. So fractal or self-similar models are more suitable to describe the modern traffic. But there is still little known about the performance of the multiplexer under self-similar traffic. In this paper, a quasi-self-similar traffic model (QSSP) is proposed. Using this model, the upper bond of the cell loss rate and multiplexing gain of the multiplexer are gotten when there are N i.i.d. QSSP inputs. If the sources have different parameters, an efficient numerical algorithm to get, this bond is proposed. Simulations indicate that our analysis is correct and accurate.     

STM／ATM业务链路资源共享策略及其性能分析

在ＳＤＨ向ＡＴＭ过渡的一个长时期内，要求ＳＤＨ能同时处理ＳＴＭ和ＡＴＭ业务，这些业务将共享ＳＤＨ链路资源，本文提出了固定边界和移动边界容量分配两种共享资源策略，对各自的性能作了理论分析，并介绍了计算机模拟结果，计算机模拟证实了分析的正确性。     

Algorithms for allocating wavelength converters in all-opticalnetworks

In an all-optical wide area network, some network nodes may handle heavier volumes of traffic. It is desirable to allocate more full-range wavelength converters (FWCs) to these nodes, so that the FWCs can be fully utilized to resolve wavelength conflict. We propose a set of algorithms for allocating FWCs in all-optical networks. We adopt the simulation-based optimization approach, in which we collect utilization statistics of FWCs from computer simulations and then perform optimization to allocate the FWCs. Therefore, our algorithms are widely applicable and they are not restricted to any particular model or assumption. We have conducted extensive computer simulations on regular and irregular networks under both uniform and nonuniform traffic. Compared with the best existing allocation, the results show that our algorithms can significantly reduce: (1) the overall blocking probability (i.e., better mean quality of service) and (2) the maximum of the blocking probabilities experienced at all the source nodes (i.e., better fairness). Equivalently, for a given performance requirement on blocking probability, our algorithms can significantly reduce the number of FWCs required     

Multi-hop Delay Performance in Wireless Mesh Networks

Wireless Mesh Network (WMN) technology is an attractive solution to meet the demand of broadband network access anywhere and anytime. In order to effectively support delay-sensitive applications such as video streaming and interactive gaming in a WMN, it is crucial to develop feasible methodologies and techniques for accurately analyzing, predicting and guaranteeing end-to-end delay performance over multi-hop wireless communication paths. In this paper, we extend the link-layer effective capacity model and derive a lower bound of delay-bound violation probability, or complementary cumulative distribution function, over multi-hop wireless connections. A fluid traffic model with cross traffic and a Rayleigh fading channel with additive Gaussian noise and Doppler spectrum are considered in our study. The average multi-hop delay and jitter performance bounds are also obtained. Analytical results are verified by extensive computer simulations under different traffic load and wireless channel conditions. We find that multi-hop delay performance is much more sensitive to traffic load and maximum Doppler rate than traffic correlation.     

Evaluation of throughput and protection in optically switched metropolitan network architectures

In this study, we investigate the performance of optical packet/burst switched (OPS/OBS) architectures connected as mesh and as ring topologies for future optical metropolitan networks. Network throughput and protection to link failure under uniform traffic distribution for all nodes are investigated to evaluate the sensitivity of OPS/OBSN performance. Our data are based on analytic results and computer simulations that include a comparison between various mesh and ring topologies. We also consider detailed traffic distributions over the network links and the impact caused by failure of more or less loaded links, thus providing a method to select links that require protection, which can be very useful in network planning.     

具有窗口接入和线群输出结构的输入缓冲ATM交换网络的性能分析

本文提出了具有组合的窗口接入和线群输出结构的输入缓冲ＡＴＭ交换网络并对其性能进行了研究通过概率生成函数方法得到了计算该交换网络最大吞吐率,平均信元时延和信元丢失率的封闭表达式,并通过计算机模拟实验验证了理论分析的精确性,研究结果表明,在随机均匀业务下,当窗口尺寸和输出群尺寸分别为４和１６时,最大吞吐率可达到９９％。     

SDH自愈环的路由算法研究

本文分析了四纤双向共享保护环的几种业务路由算法，对各种算法所需的环路容量配置进行了计算机的随机统计模拟，基于上述模拟结果，讨论了用户接入网、局间中继网等网络所具有的不同业务分布模型与路由算法的关系，探讨了根据网络自身的业务特点选择业务路由算法的方法