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ATM (ICATM 2001) and High Speed Intelligent Internet Symposium, 2001. Joint 4th IEEE International Conference on

Date 22-25 April 2001

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Displaying Results 1 - 25 of 68
  • Joint 4th IEEE International Conference on ATM(ICATM'01) and High Speed Intelligent Internet Symposium. ICATM 2001 (Cat. No.00EX486)

    Publication Year: 2001
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    Freely Available from IEEE
  • Voice over AAL2 system using the shared-buffer scheme

    Publication Year: 2001 , Page(s): 260 - 264
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB) |  | HTML iconHTML  

    Asynchronous transfer mode (ATM) adaptation layer 2 (AAL2) supports effective transmission of low-bit-rate, short, variable length and real-time voice data. For this purpose, AAL2 assembles voice packets from many channels into a single ATM cell. Cell assembly must be done separately VC by VC (virtual connection), so a buffer management scheme is required. In this paper, we propose the shared-buffer scheme as a cell assembly queue (CAQ) management scheme, and analyze the performance of a voice over AAL2 system which uses the proposed scheme. We focus on the system performance in terms of the cell loss probability due to buffer shortage View full abstract»

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  • MDP-based dynamic update of aggregated information for hierarchical QoS routing

    Publication Year: 2001 , Page(s): 113 - 117
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB) |  | HTML iconHTML  

    ATM private network-to-network interface (PNNI) adopts hierarchical routing to achieve scalability in large ATM networks. For performing hierarchical routing efficiently, the network consists of peer groups, and peer groups advertise the aggregated information periodically which is based on a time-based update interval. The PNNI time-based update policy is inadequate to cope with dynamic network traffic. Therefore, in this paper, we propose two dynamic update policies, referred to as the dynamic cost-based update (DCU) policy and the DCU with hysteresis (DCUH) policy, to improve the accuracy of aggregated information and the performance of hierarchical routing, while decreasing the frequency of re-aggregation and distribution. Furthermore, in the past, the definition of cost function has received much less attention. In this paper, we study the Markov decision process (MDP) theory to define the cost function. Based on the MDP approach, we compare the DCU policy with PNNI time-based update (PNNIU) policy, full update (FU) policy, and logarithm of residual bandwidth update (LRBU) policy. Our simulation results indicate that the proposed DCU and DCUH policies yield better performance while significantly reducing the frequency of re-aggregation and the amount of distributed aggregation information. The overhead of re-aggregation of DCUH is lower than that of DCU due to the effect of hysteresis View full abstract»

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  • Implementation of a VC-merge capable crossbar switch on MPLS over ATM

    Publication Year: 2001 , Page(s): 66 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    Recently, as the Internet and its services grow rapidly, a new switching mechanism, MPLS (multiprotocol label switching), has been introduced by IETF. In this paper, we propose a scalable hardware architecture for a high-speed crossbar switch capable of VC-merging in MPLS networks. A scheduler configuring the crossbar switch in input-queued fashion has been designed and implemented. The switch has MIQs (multiple input queues) at input ports. In the designed switch, there are eight VC-merge capable modules, one for each output port. The proposed architecture is modeled in VHDL, synthesized on SYNOPSYS, and fabricated using the SAMSUNG 0.5 μm SOG process View full abstract»

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  • A flexible ATM switching system (MHN-Aπ) supporting quality-of-service

    Publication Year: 2001 , Page(s): 133 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    A new technique (called inter-network ABR) that can handle different types of ATM bearer services, such as ABR (available bit rate) and GFR (guaranteed frame rate) services, with the same ATM switching system hardware is proposed. It makes node hardware simpler and more flexible. The MHN-Aπ system was implemented using this technique. The inter-network ABR technique and the MHN-Aπ system can be applied to new ATM services View full abstract»

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  • An efficient recovery mechanism for MPLS-based protection LSP

    Publication Year: 2001 , Page(s): 75 - 79
    Cited by:  Papers (4)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB) |  | HTML iconHTML  

    Network reliability and survivability have been very important issues to provide for application services that may require a real-time service or high priority QoS (quality of service) in the Internet. IETF has proposed largely two recovery mechanisms for MPLS-based protection label switching path (LSP), which are protection switching and rerouting models. However, from the viewpoint of TE (traffic engineering), IETF's recovery mechanisms have not considered the optimal backup path for the recovery of an LSP in the occurrence of a network failure. This paper suggests an efficient pre-qualified recovery mechanism, which optimizes the network performance by considering link usage. Since an existing recovery mechanism, pre-qualified rerouting, selects a backup path only once at the LSP setup time, it may not reflect the exact status of network resources at the time of a fault. In contrast, our approach exchanges network status information among LSRs so that the backup path selection engine can use up-to-date information and decide an optimal backup path for a possible failure. The performance of the proposed recovery method has been demonstrated by simulation using MNS (MPLS network simulator). The new proposed recovery mechanism can always maintain an optimized network state regardless of the fault occurrence View full abstract»

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  • Next generation Internet backbone router

    Publication Year: 2001 , Page(s): 316 - 319
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB) |  | HTML iconHTML  

    Next generation Internet backbone node technologies are proposed that offer sophisticated QoS support including real time voice, video streaming, and VPN (virtual private network). The backbone network consists of small size IP + ATM nodes (type-S) and backbone core nodes (type-X). Type-S nodes support both ATM bearer and IP QoS services. In addition, the traffic control set between input line card buffer and output line card buffer is based on the ABR VS/VD mechanism. The backbone core nodes utilize IP-based high performance routers. They host the sophisticated IP QoS control mechanism called the advanced DiffServ technique. This newly proposed technique offers real time voice and connection based buffering capability. These two types of nodes will allow the next generation high-quality IP network to be realized View full abstract»

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  • Bandwidth measurement in xDSL networks

    Publication Year: 2001 , Page(s): 222 - 226
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB) |  | HTML iconHTML  

    This paper presents the design and implementation of a scheme for accurate measurement of network bandwidth in xDSL networks, including asymmetric upstream and downstream cases. A stepwise algorithm is designed to minimize the effect on the measurements of ATM traffic shaping for ABR and UBR service classes in xDSL deployments. The accuracy of the algorithm is achieved by implementing an original traffic generator with stable performance. Evaluation experiments have demonstrated that the algorithm can achieve accurate bandwidth measurement in xDSL networks View full abstract»

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  • Performance comparison of two common control channels for 3G systems

    Publication Year: 2001 , Page(s): 231 - 234
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    Performance of the access channel in cdma2000 and random access channel in W-CDMA is studied in this paper. In such systems, the accessing user can degrade the performance of existing users by introducing extra interference such as packet collision and blocking. We study how much the random access channel in W-CDMA is superior to an access channel in cdma2000 by employing a more complicated channel structure. In addition, channel occupancy, which is a measure of interference to other channel types in the system, is also investigated. Simulation is carried out to compare the performance of these channels under fixed frame error rates and varying offered load conditions View full abstract»

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  • PT Telkom results on field tests of asymmetric digital subscriber line-lite technology via ATM networks

    Publication Year: 2001 , Page(s): 227 - 230
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB) |  | HTML iconHTML  

    In the competitive telecommunications market, telephone companies' success will be determined by their ability to satisfy customers with first-to-market solutions that improve efficiency, effectiveness and profits. A significant and available opportunity for telephone companies is a high-speed data access service, designed for the masses, that networks PCs together to form private networks. This service would typically include access to corporate LANs and the Internet. Using the existing network to provide these services is imperative to acquire a rapid market share. Digital subscriber line (DSL) technologies, specifically, asymmetric digital subscriber line (ADSL) products, fulfill this need. ADSL offers sufficient bandwidth to provide high-speed access to the growing number of dial-up PC users. ADSL also solves numerous network problems created by the longer-than-average holding times for data users. ADSL provides a migration path to the new network infrastructures, including asynchronous transfer mode (ATM) networks. Telephone companies must react quickly or risk losing existing market shares to the CATV companies who plan to offer high-speed access services via cable modems implemented on existing HFC networks. ADSL allows telephone companies to enter the market quickly and to offer sophisticated, high-speed data services to their customer. This paper describes the results of field tests, carried out by PT Telekomunikasi Indonesia, tbk (PT Telkom), on digital subscriber lines (xDSL) to evaluate the speed and quality of services provided by ADSL-lite technology. Following the tests, PT Telkom is preparing to launch a pilot xDSL service View full abstract»

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  • A new traffic conditioner for guaranteeing throughput fairness of assured services in a differentiated service network

    Publication Year: 2001 , Page(s): 97 - 101
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB) |  | HTML iconHTML  

    Assured service (AS) connections in a differentiated service (DiffServ) network are not supplied with the expected service levels, which stems from the unfair allocation of the network bandwidth mainly caused by three factors-different TCP reserved rate, UDP/TCP interaction and round trip time (RTT). In order to alleviate simultaneously the impacts of the three factors, this paper proposes the W2F-TC (weighted-write-fair traffic conditioner) to be installed at an edge router in a DiffServ network. W2F-TC is composed of three phases, namely the traffic shaping phase, the writing probability calculation phase and the weighted writing phase. W2F-TC allows AS connections not only to attain reserved rates but also to approach ideal rates with lessening of the impact of both different TCP reserved rate and UDP/TCP interaction. In case of RTT, W2F-TC guarantees throughput assurance compared with the RIO-based traffic conditioner View full abstract»

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  • Congestion problem of IP over MPLS on the label overload

    Publication Year: 2001 , Page(s): 80 - 84
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (260 KB) |  | HTML iconHTML  

    MPLS is a forward scheme. In the Open Systems Interconnection (OSI) seven-layer model, it is between Layer 2 (L2, link layer) and Layer 3 (L3, network layer). Each MPLS packet has a header. The header contains a 20 bit label, a 3 bit class of service (COS) field, a 1-bit label stack indicator and an 8-bit TTL field. The MPLS header is encapsulated between the link layer header and the network layer header. The label stack is represented as a sequence of “label stack entries”. Each label stack entry is represented by 4 octets. The label stack entries appear after the data link layer headers, but before any network layer headers. In IP over MPLS, labeled IP packet traffic is overloaded in respect to unlabeled IP packet traffic. In this paper, by varying the packet rate and measuring the throughput of the flows, we analyze the performance of labeled IP packet traffic and unlabeled IP packet traffic in IP over MPLS. Also in this paper, we suggest a change to the label allocation algorithm and explore the effect of the change on IP over MPLS View full abstract»

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  • Routing interval: a new concept for IP lookups

    Publication Year: 2001 , Page(s): 310 - 315
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB) |  | HTML iconHTML  

    Nowadays, the commonly used table lookup scheme for IP routing is based on the so-called classless interdomain routing (CIDR). With CIDR, routers must find out the best matching prefix (BMP) for IP packet forwarding, which complicates the IP lookup. Currently, this process is mainly done in software and several schemes have been proposed for hardware implementation. Since the IP lookup performance is a major design issue for the new generation routers, in this article, we investigate the properties of the routing table and present a new approach for IP lookups; our approach does not require the rule of BMP and thus significantly reduces the complexity. By applying our proposed approach, the computation cost of existing schemes can be significantly reduced. We also propose an efficient IP lookup algorithm, with which we improve the binary search on prefixes to 30 MPPS (million packets per second) and 5,000 route updates/sec under the same experimental setup with an even larger routing table View full abstract»

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  • Dynamic gain control of booster amplifier (EDFA) using an optical supervisory channel power adjustment in WDM transmission systems

    Publication Year: 2001 , Page(s): 278 - 281
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB) |  | HTML iconHTML  

    We present a simple dynamic gain control of a booster amplifier (EDFA-erbium-doped fibre amplifier) with an optical supervisory channel power adjustment in WDM transmission systems. As a result, we performed gain clamping and power clamping of EDFA in the optical link. We can transmit 10 Gbps WDM signals and a 155 Mbps supervisory signal through a single mode fiber 320 km according to the change of signal channel number View full abstract»

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  • Study on reduction of total bandwidth requirement by traffic dispersion

    Publication Year: 2001 , Page(s): 285 - 289
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB) |  | HTML iconHTML  

    This paper studies the effect of using traffic dispersion in call admission control (CAC) on the reduction of the total effective bandwidth requirement for high-speed networks. In this paper, we consider a discrete-time queueing system and a particular source model which is called generalized binary Markov source (GBMS). We then focus on the effective bandwidth of GBMS. We provide some numerical results to investigate the effect of traffic dispersion on the total bandwidth requirement. The numerical results show that traffic dispersion is useful to reduce the total effective bandwidth required by GBMS View full abstract»

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  • Provisioning premium services without per-flow management for IP DiffServ architecture

    Publication Year: 2001 , Page(s): 102 - 107
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB) |  | HTML iconHTML  

    Currently, IP networks are becoming mission critical and the best-effort service model is no longer sufficient. The Internet architecture has to be extended with service differentiation mechanisms. Differentiated service (DiffServ) architecture is proposed for QoS provision over IP networks. With the connectionless protocol architecture, to satisfy the requirements of guaranteed services is an important and highly challenging task. In this paper, we present a simple and effective delay-jitter traffic control approach for supporting premium services, such as virtual leased line, without per-flow management in DiffServ networks. Through mathematical analysis, we demonstrate that the proposed strategy features an adequate performance in delay-jitter. Moreover, it is feasible in implementation. We also provide a simulation analysis that evaluates the property of the proposed strategy. It may fulfill the emerging needs of guaranteed services over IP networks View full abstract»

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  • Simulator for MPLS path restoration and performance evaluation

    Publication Year: 2001 , Page(s): 32 - 36
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB) |  | HTML iconHTML  

    Path restoration in multiprotocol label switching (MPLS) is the technique to reroute traffic around a failure in a label switched path (LSP). Recently many schemes on path restoration have been proposed, which prompt the necessity of a simulator. This paper proposes a simulator for path restoration, which supports not only protection configurations such as pre-negotiated protection and dynamic protection, but also protection activation such as global repair and local repair. By using the proposed simulator, the existing schemes are simulated and compared in terms of packet loss, reordering of packets, and resource utilization, respectively. Those schemes are Haskin, Makam, and simple-dynamic. In the simulation, both best-effort traffic and QoS traffic are used as traffic to be protected. LSPs for best-effort traffic are setup by using explicit routed (ER) LSP, which does not consider resource reservation but can utilize the rest of the bandwidth of the link. LSPs for QoS traffic are setup by using constraint-based routed (CR) LSP, which is guaranteed the bandwidth required but can not utilize the rest of the bandwidth of the link View full abstract»

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  • Flow-based admission control for multiple service classes in the ATM-based MPLS network

    Publication Year: 2001 , Page(s): 37 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB) |  | HTML iconHTML  

    In this paper, we propose a backbone network that supports integrated as well as differentiated services (IntServ and DiffServ) through an ATM shortcut connection or label swapping of multiprotocol label switching (MPLS) using the capabilities of an underlying ATM network to realize quality of service (QoS). In the label edge router (LER), we design a DiffServ mapping algorithm and integrated packet scheduler. Also, we propose a flow-based admission control algorithm that is suitable for multiple service class environments. This algorithm can achieve the two objects of reliable delay bounded QoS provisioning and high resource utilization using flow-based traffic classification View full abstract»

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  • Analysis of DS-CDMA system with smart antenna for different bandwidths in the wideband multipath channel

    Publication Year: 2001 , Page(s): 235 - 239
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB) |  | HTML iconHTML  

    In this paper, the performance of a DS-CDMA system with smart antenna is analyzed for different bandwidths (1.25 MHz, 5 MHz) and different channel environments (rural, urban). For the analysis of the smart antenna system, the vector channel having spatio-temporal correlation is modeled as a time-variant linear filter in time, and each multipath is assumed to be a reflective wave from only one direction (only one cluster) in space. Several multipaths within one chip are distinguished into each one and the strongest signal is selected. The DS-CDMA system with smart antenna using wider bandwidth presents better performance than that using narrow bandwidth. It is shown that the smart antenna is more effective in an urban area when using a 2D-RAKE receiver View full abstract»

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  • Advanced mechanisms for available rate usage in ATM and differentiated services networks

    Publication Year: 2001 , Page(s): 85 - 90
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB) |  | HTML iconHTML  

    The available bit rate (ABR) service category was defined for ATM networks in order to provide a minimal guaranteed rate while letting a user exploit additional unused capacity from other service categories. In this paper, experiences with an implementation of a driver enabling ABR support and the steps needed to integrate it in an end system are described. Furthermore, the deployment of ABR in an xDSL environment is discussed. Additionally, an approach is presented that transfers the idea of using the available rate from ATM to IP networks based on differentiated services. A new forwarding behavior is proposed and evaluated by simulations View full abstract»

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  • Gateway for media cruising resource reservation protocol in ATM network

    Publication Year: 2001 , Page(s): 269 - 273
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB) |  | HTML iconHTML  

    We have already proposed media cruising signaling protocol (MCSP) for high-speed resource reservation by controlling the link layer from the IP layer directly. Although it would be better to apply MCSP between terminals to make full use of the features of the resource reservation protocol, if media cruising (MC) is applied in an existing application, some problems occur. MCSP currently runs on FreeBSD, but is not implemented in other operating systems (OSs). In addition, ATM is used to control the quality of service with resource reservation, but ATM interface cards are only available for some OSs. To solve these problems, we propose an MC gateway that interfaces between a terminal and an MC network. This paper outlines MCSP and the MC gateway and presents experimental results for transferring moving pictures via a prototype MC gateway. These show the effectiveness of the MC gateway View full abstract»

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  • RED-priority cell discarding method for improving TCP performance in ATM networks

    Publication Year: 2001 , Page(s): 61 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB) |  | HTML iconHTML  

    The poor throughput TCP achieves in ATM networks can be mainly attributed to the timeout problem. Multiple packet losses make the timeout problem. Multiple packet losses happen in the long time wasted passing through a buffer, because of a loss of several segments during the same sending window. In order to solve the long time wasted passing through buffer, random early detection (RED) is used to keep the average queue size as low as possible while allowing occasional bursts. Also, we propose a new cell discarding policy called RED-PCD (priority cell discarding). A damaged VC has a higher priority over non-damaged VCs in the sense that it is subject to the upper maxth of the queue for some recovery period. RED-PCD spaces segment losses far from one another, reducing the multiple packet losses View full abstract»

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  • A line protection switching and maintenance signal operation for a DWDM system

    Publication Year: 2001 , Page(s): 282 - 284
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (192 KB) |  | HTML iconHTML  

    This paper introduces a WDM system structure for protecting systems at optical channel layer and optical multiplexer layer respectively. The maintenance signal operation method for WDM systems is also presented for the case of system failure in comparison to SDH ones View full abstract»

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  • A novel VP-based ATM restoration scheme for providing multiple restorability levels

    Publication Year: 2001 , Page(s): 333 - 338
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB) |  | HTML iconHTML  

    Today's high-speed telecommunications networks are growing ever more complicated. In this environment, there is a need for fast restoration strategies to recover from multiple network failures. We propose a new scheme that provides multiple reliability levels for different service classes. This scheme proposes the addition of a new parameter defined as “restoration priority” to the ATM quality-of-service (QoS) parameters for each virtual path (VP). This new parameter determines the reservation priority for each service class. We have used computer simulations to demonstrate the efficiency of the proposed restoration technique compared to the existing methods View full abstract»

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  • Mobile IP in wireless ATM networks

    Publication Year: 2001 , Page(s): 42 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB) |  | HTML iconHTML  

    Wireless communications have undergone a tremendous growth in recent years. With systems for mobile analog and digital cellular telephony, radio paging, and microwave/satellite broadcasting becoming widespread, next generation wireless communications systems such as wireless ATM (WATM) will be required to support the seamless delivery of voice, video and data with high quality. In this context, applying mobile IP in wireless ATM networks is intended to be a direct extension of the existing fixed/wireline broadband networks with uniform end-to-end QoS guarantees View full abstract»

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