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IEEE ATM Workshop '99 Proceedings (Cat. No. 99TH8462)最新文献

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Encapsulating ATM cells in TCP/IP for transport between ATM based backbone and end-user terminals, to enable real-time network-aware services 在TCP/IP中封装ATM单元,以便在基于ATM的骨干网和最终用户终端之间进行传输,以实现实时网络感知服务
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786857
S. Kowtha
We propose a protocol, ATM/IP, that encapsulates ATM cells into TCP segments to virtually connect end-user multimedia terminals with ATM based backbone networks. This protocol will enable end-users or service providers to develop and deploy real-time, network-aware applications where the network backbone is ATM based, and the backbone is connected to the multimedia terminals over a well-managed local IP network or a dial-up IP connection. Approaches such as RSVP, diffServ, MPLS and IP over SONET are underway to bring real-time services capability to the Internet independent of ATM. However, ATM continues to be the only promising technology in this area because of its ability to negotiate connection parameters and to enforce performance across the network to guarantee those parameters. Our proposal bridges the gap in networks where ATM will be the primary technology used in the network backbone, but not to connect the backbone to end-user terminals.
我们提出了一种ATM/IP协议,它将ATM单元封装到TCP段中,以虚拟地将终端用户多媒体终端与基于ATM的骨干网连接起来。该协议将使最终用户或服务提供商能够开发和部署实时的网络感知应用,其中网络骨干网是基于ATM的,骨干网通过管理良好的本地IP网络或拨号IP连接连接到多媒体终端。诸如RSVP、diffServ、MPLS和IP over SONET等方法正在进行中,它们将独立于ATM的实时服务能力引入互联网。然而,ATM仍然是该领域唯一有前途的技术,因为它能够协商连接参数并在整个网络中强制执行性能以保证这些参数。我们的建议弥补了ATM将成为骨干网中使用的主要技术的网络差距,但不是将骨干网连接到最终用户终端。
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引用次数: 0
Throughput of ATM cell over wireless Rayleigh channel 无线瑞利信道上ATM小区的吞吐量
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786890
Jingshown Wu, Che-Li Lin
In this paper, an error correction scheme employing side information is proposed for the first time to improve the throughput of asynchronous transfer mode (ATM) transmission over a Rayleigh fading channel using binary phase shift keying (BPSK) modulation. With the combination of the selective repeat protocol (SR) in the link layer and the error correction scheme, the throughput of the ATM cell is improved significantly. Numerical examples show that at high bit error rate the throughput gain is enormous.
为了提高瑞利衰落信道异步传输模式(ATM)的吞吐量,首次提出了一种基于侧信息的纠错方案,该方案采用二进制相移键控(BPSK)调制。将链路层的选择性重复协议(SR)与纠错机制相结合,可以显著提高ATM小区的吞吐量。数值算例表明,在高误码率下,吞吐量增益是巨大的。
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引用次数: 3
Design of a shared multi-buffer ATM switch with enhanced throughput in multicast environments 多播环境下提高吞吐量的共享多缓冲区ATM交换机设计
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786896
JongIck Lee, JongMoo Sohn, MoonKey Lee
We propose a shared multi-buffer ATM switch, in which each unicast cell has chances to be read from a shared buffer during three consecutive read cycles and each multicast cell is read from a shared buffer if the shared buffer is not accessed for read of a unicast cell at the last read cycle. The HOL effect that the unicast cells experience is not augmented by the multicast cells and the utilization rate of the output ports is increased because both a unicast cell and a multicast cell have the opportunity to be read for each output port. For a fixed multicast rate, the proposed scheme shows 98.9% throughput even though the offered load reaches 1. We designed the proposed shared multi-buffer ATM switch in 0.6 um single-poly triple metal CMOS technology. The designed shared multi-buffer ATM switch has 8/spl times/8 ports and operates at 20 MHz, which supports 155.52 Mbit/s STM-1 source rate for each port.
我们提出了一种共享多缓冲区ATM交换机,其中每个单播单元有机会在三个连续的读取周期中从共享缓冲区中读取,如果在最后一个读取周期中没有访问共享缓冲区以读取单播单元,则从共享缓冲区中读取每个多播单元。单播单元经历的HOL效应不会被组播单元增强,并且输出端口的利用率会增加,因为单播单元和组播单元都有机会为每个输出端口读取。对于固定的组播速率,即使提供的负载达到1,所提出的方案仍能保持98.9%的吞吐量。我们采用0.6 um单聚三金属CMOS技术设计了所提出的共享多缓冲ATM开关。所设计的共享多缓冲ATM交换机具有8/spl倍/8端口,工作频率为20 MHz,每个端口支持155.52 Mbit/s的STM-1源速率。
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引用次数: 2
Cell selection algorithm for the multiple input-queued ATM switch: chessboard and random cell selections 多输入排队ATM交换机的小区选择算法:棋盘和随机小区选择
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786866
Hakyong Kim, Kiseon Kim, Yongtak Lee, Hyunho Yoon, C. Oh
A simple and efficient cell selection algorithm for the multiple input-queued ATM switch, named the chessboard cell selection algorithm, is proposed in this paper. The proposed algorithm selects one of the transmission requests for the output port with the lowest value of transmission request sum. By doing so, we can reduce a newly introduced front-of-line (FOL) blocking so as to achieve an enhancement in the throughput for uniform arrival traffic. Besides the enhanced throughput, the proposed algorithm can reduce mean cell delay by 50% or more and cell loss probability by 90% or more than the random selection scheme. Time complexity is O(N/sup 2/) in the worst case, where N is the switch size.
针对多输入排队ATM交换机,提出了一种简单高效的小区选择算法——棋盘小区选择算法。该算法从传输请求总和最小的传输请求中选择一个发送到输出端口。这样,我们可以减少新引入的前线阻塞,从而提高统一到达交通的吞吐量。除了提高吞吐量外,与随机选择方案相比,该算法可将平均细胞延迟降低50%以上,将细胞丢失概率降低90%以上。在最坏情况下,时间复杂度为0 (N/sup 2/),其中N为开关大小。
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引用次数: 3
A partition shortcut scheme for IP/ATM integration IP/ATM集成的分区快捷方案
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786860
S. Ahn, T. Suda
Efficient integration of network- and link-layers is becoming very important in deploying ATM networks in the IP-dominant Internet environment. Existing integration schemes, often called shortcut schemes, primarily map network layer services (such as IP protocol) onto link layer connections (such as ATM connections). Those existing schemes, however, have some drawbacks in scalability and latency when performing this mapping. Therefore, we propose a new scheme in which the features of the existing shortcut schemes are combined to overcome the drawbacks of existing schemes. The proposed scheme is based on the overlay model in the sense that both IP and ATM addresses are used and provide standard ATM connections as direct shortcuts using the ATM address resolved from the IP address. This scheme, at the same time, allows a flexible mechanism for various levels of flow aggregation capability using IP topology information provided by routing protocols such as BGP, OSPF, etc.
在以ip为主导的Internet环境中部署ATM网络时,网络层和链路层的有效集成变得非常重要。现有的集成方案通常被称为捷径方案,主要是将网络层业务(如IP协议)映射到链路层连接(如ATM连接)上。但是,在执行此映射时,这些现有方案在可伸缩性和延迟方面存在一些缺点。因此,我们提出了一种新的方案,该方案结合了现有快捷方式的特点,克服了现有快捷方式的缺点。该方案基于覆盖模型,同时使用IP地址和ATM地址,并使用从IP地址解析的ATM地址作为直接捷径提供标准ATM连接。同时,该方案利用路由协议(如BGP、OSPF等)提供的IP拓扑信息,为不同级别的流量聚合能力提供了灵活的机制。
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引用次数: 0
A study on accommodation of TCP/IP best-effort traffic to wide area ATM network with VBR service category using selective cell discard 基于选择性小区丢弃的TCP/IP最大努力流量适应VBR业务类别广域网ATM的研究
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786907
S. Ano, T. Hasegawa, T. Kato
It is important to establish the technology to accommodate best-effort TCP/IP traffic over wide area ATM networks. The UBR (unspecified bit rate) service category is the most typical service category for the best-effort traffic, especially in the LAN environment. On the other hand, the VBR (variable bit rate) service category with SCD (selective cell discard) option is considered as the service category which is appropriate for wide area networks due to its fairness and minimum guarantee of the cell transmission using not only PCR (peak cell rate) but SCR (sustainable cell rate) and MBS (maximum burst size). However, there is no actual evaluation for such service. We have, therefore, performed the experimental studies on TCP/IP over VBR with SCD service along with UBR and VBR without SCD cases. Through these experiments, we measured the link utilization of the effective data and the fairness between each obtained TCP/IP throughput during congestion of the ATM switch. From the results of the link utilization, the value is always over 90% under the various conditions. Therefore, even in the case of cell losses due to SCD or buffer overflow in ATM switch congestion, the average throughput is almost the same as the value which equals the trunk line speed divided by the number of the accommodated TCP/IP connections. From the results of the fairness, VBR with SCD has almost the same characteristics as UBR and obtains better TCP/IP throughput than VBR without SCD. Finally, we discuss the effectiveness of VBR with SCD and the other service categories, such as UBR and ABR (available bit rate), and conclude that VBR with SCD is one of the most suitable ATM service categories for wide area ATM networks.
重要的是建立一种技术,以适应广域ATM网络上的最佳TCP/IP流量。UBR(未指定比特率)业务类别是最典型的尽力而为流量服务类别,特别是在局域网环境中。另一方面,具有SCD(选择性小区丢弃)选项的VBR(可变比特率)服务类别被认为是适合于广域网的服务类别,因为它不仅使用PCR(峰值小区速率),而且使用SCR(可持续小区速率)和MBS(最大突发大小)对小区传输进行公平和最小保证。但是,对这种服务没有实际的评价。因此,我们对带SCD服务的VBR上的TCP/IP以及UBR和不带SCD的VBR进行了实验研究。通过这些实验,我们测量了ATM交换机在拥塞期间有效数据的链路利用率和每个获得的TCP/IP吞吐量之间的公平性。从链路利用率的结果来看,在各种条件下,该值都在90%以上。因此,即使在ATM交换机拥塞中由于SCD或缓冲区溢出导致cell丢失的情况下,平均吞吐量也几乎等于中继线速度除以可容纳的TCP/IP连接数的值。从公平性的结果来看,带SCD的VBR具有与UBR几乎相同的特性,并且比不带SCD的VBR获得更好的TCP/IP吞吐量。最后,我们讨论了VBR与SCD的有效性,以及其他业务类别,如UBR和ABR(可用比特率),得出VBR与SCD是最适合广域ATM网络的ATM业务类别之一。
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引用次数: 3
Adaptive broadband extension of Web systems Web系统的自适应宽带扩展
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786892
H. Abe, M. Kawashima
We propose an extension to enable applications that can take full advantage of ATM SVC services. The proposed extension, the adaptive broadband extension (ABE), has the following advantages: (1) systems can appropriately invoke VC establishment taking into account the application requirements recognized at the application layer, e.g., file size and video bit-rate; (2) information providers can upgrade their systems with the proposed extension while preserving connectivity with existing WWW clients; (3) service quality, such as transfer speed and jitter are improved without the need to modify old muitimedia/hypermedia scripts, e.g., HTML. We are now planning to implement ABE-Web systems on a wide ATM SVC network. Security enhancement is another issue to be pursued.
我们提出了一个扩展,以使应用程序能够充分利用ATM SVC服务。提出的自适应宽带扩展(ABE)具有以下优点:(1)系统可以适当地调用VC建立,同时考虑到应用层识别的应用需求,例如文件大小和视频比特率;(2)信息提供商可以在与现有WWW客户端保持连接的同时,利用该扩展对其系统进行升级;(3)服务质量,如传输速度和抖动得到改善,而无需修改旧的多媒体/超媒体脚本,例如HTML。我们现在计划在广泛的ATM SVC网络上实现ABE-Web系统。加强安全是另一个需要解决的问题。
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引用次数: 0
Native ATM versus IP over ATM: comparative study 本机ATM与IP over ATM:比较研究
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786777
T. Chahed, S. Ben Fredj, C. Fayet
The main focus of this paper is native ATM versus IP over ATM solutions. We investigate the theoretical and experimental comparative performance of native ATM and CLIP. We explicitly quantify loss, throughput at the receiver (inversely proportional to delay) and CPU utilization. The key results of this work are: first, we observe a relatively important loss rate for small packet sizes which gets smaller for larger packets. UDP shows larger loss rate than native ATM. For larger packet sizes loss rate tends to zero. Second, for both UDP and native ATM, throughput at the destination is unstable for packets of small size. It reaches equilibrium for packet sizes on the order of 10k octets. Native ATM has a higher throughput owing to the smaller overhead it presents. Third, for both protocols, the CPU is used more at the receiver. At the transmitter, UDP uses more CPU than native ATM, owing to the overhead it introduces across the layers. Those results are further discussed.
本文的主要焦点是本机ATM与IP over ATM解决方案。我们研究了原生ATM和CLIP的理论和实验性能比较。我们明确量化了损失、接收器上的吞吐量(与延迟成反比)和CPU利用率。这项工作的关键结果是:首先,我们观察到小数据包大小的相对重要的损失率,对于较大的数据包会变小。UDP比本机ATM丢包率高。对于较大的包大小,丢包率趋于零。其次,对于UDP和本机ATM,对于小尺寸的数据包,目的地的吞吐量是不稳定的。它在10k字节量级的数据包大小上达到平衡。本机ATM具有更高的吞吐量,因为它的开销更小。第三,对于这两种协议,CPU更多地用于接收端。在发送端,UDP比本机ATM使用更多的CPU,因为它跨层引入了开销。这些结果将进一步讨论。
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引用次数: 0
A high performance fuzzy traffic controller for ATM networks 一种用于ATM网络的高性能模糊流量控制器
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786885
M. Yaghmaee, M. Safavi, M. B. Menhaj
In asynchronous transfer mode (ATM) networks, to avoid congestion situations which decrease the quality of service (QoS) of already established connections, usage parameter control (UPC) is necessary. An ideal UPC mechanism must be able to detect any possible violation from the traffic contract. In this paper we use the benefits of fuzzy logic to design a high performance fuzzy traffic controller. In our proposed fuzzy traffic controller, the actual mean cell rate of the traffic source is estimated and the traffic controller is adjusted so its loss load is equal to the generated excessive load. To improve the channel utilization, the proposed fuzzy traffic controller uses feedback from the network to decide whether to pass, mark or discard the input cells. Simulation results show that the proposed fuzzy traffic controller can outperform the traditional UPC mechanisms. It has been also observed that our proposed fuzzy traffic controller improves the channel utilization and demonstrates a low cell loss probability.
在异步传输模式(ATM)网络中,为了避免拥塞而降低已建立连接的服务质量(QoS),使用参数控制(UPC)是必要的。理想的UPC机制必须能够检测到流量契约中任何可能的违规行为。本文利用模糊逻辑的优点设计了一种高性能的模糊交通控制器。在我们提出的模糊交通控制器中,估计交通源的实际平均单元率,并调整交通控制器使其损失负载等于产生的超额负载。为了提高信道利用率,本文提出的模糊交通控制器利用网络反馈来决定是否通过、标记或丢弃输入单元。仿真结果表明,所提出的模糊交通控制器优于传统的UPC机制。我们所提出的模糊交通控制器提高了信道利用率,并显示出较低的小区损失概率。
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引用次数: 4
Transition matrix generation for complex node representation 复杂节点表示的转换矩阵生成
Pub Date : 1999-05-24 DOI: 10.1109/ATM.1999.786901
I. Iliadis, P. Scotton
The ATM Forum has defined the private network-network interface (PNNI) for routing and signalling in ATM networks. This paper presents a novel graph coloring technique to compute the transition matrix of a PNNI peer group. The transition matrix shows traffic parameters associated with traversing a PNNI peer group between each pair of ingress-egress nodes. This matrix is computed for symmetric restrictive costs (e.g., bandwidth) with a computational complexity of O(eloge), e being the number of edges in the peer group. This algorithm also features very interesting dynamic behavior that allows the transition matrix to be updated without having to rerun the entire algorithm.
ATM论坛定义了用于ATM网络路由和信令的专用网络接口(PNNI)。提出了一种计算PNNI对等群转移矩阵的图着色方法。转换矩阵显示了与在每对进出节点之间遍历PNNI对等体组相关的流量参数。该矩阵是针对对称限制代价(例如带宽)计算的,计算复杂度为O(eloge), e为对等组中的边数。该算法还具有非常有趣的动态行为,允许在不重新运行整个算法的情况下更新转换矩阵。
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引用次数: 13
期刊
IEEE ATM Workshop '99 Proceedings (Cat. No. 99TH8462)
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