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Communications Magazine, IEEE

Issue 6 • Date June 2005

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Displaying Results 1 - 25 of 33
  • Distributed schemes for diverse path computation in multidomain MPLS networks

    Publication Year: 2005 , Page(s): 138 - 146
    Cited by:  Papers (17)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB) |  | HTML iconHTML  

    MPLS is currently used by several JSPs to carry some high-value traffic components, such as telephony over IP trunks and VPNs. For this type of traffic, service availability is a critical QoS dimension that needs to be protected from network failures. With MPLS-TE, this can be achieved by means of path protection schemes, where active and backup LSPs are routed along diverse paths. Besides protection, path diversity can be exploited for load balancing, another common means of QoS improvement. In order to preserve other QoS requirements, the paths must meet certain constraints (e.g., bandwidth availability, low load) and/or minimize some metric (e.g., hop count). This requires the ability to establish path diversity in an optimal way. In many cases of practical interest, the QoS traffic has an interdomain scope. This is the case for ToIP and VPN traffic between different carriers, or between different ASs owned by the same carrier, as found, for example, after corporate acquisitions or mergers. Therefore, path diversity is a requirement for interdomain traffic engineering. In this work we address path diversity in a multidomain network, where individual domains are capable of connection-oriented forwarding and endowed with an MPLS-TE control plane. For administrative and/or scalability reasons intradomain routing information is not disseminated externally, so dynamic path computation must be achieved by a distributed scheme based on interdomain collaboration. We briefly describe three alternative schemes recently proposed for interdomain diverse path computation, and quantitatively assess their performance with simulations over real ISP topologies. View full abstract»

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  • Service convergence using MPLS multiservice networks

    Publication Year: 2005 , Page(s): 152 - 159
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (139 KB) |  | HTML iconHTML  

    Enterprises are increasingly using virtual private networks to interconnect remote sites. Traditionally, service providers have used ATM core networks to deliver layer 2 services such as frame relay, ATM, or TDM private lines, which enterprise customers have then used to build their corporate network infrastructure. Such services account for the majority of data service revenues today. However, pressure has increased on service providers to combine increased flexibility with reduced costs in the context of a highly dynamic telecommunications market. Service providers also need to generate new revenues from their IP network infrastructure, through new opportunities such as IP VPNs and virtual private LAN services, while simultaneously achieving operational efficiencies through the convergence of all of their services on a common MPLS backbone. New access and metro network technologies, such as Ethernet, are also emerging that can be used to deliver these new services to enterprise customers alongside ATM and frame relay access. This must be achieved while also supporting existing technologies such as ATM, which continue to deliver highly profitable services. This article discusses the technical challenges in meeting the often conflicting requirements of delivering both traditional layer 2 services and new layer 3 services on a converged MPLS network. We show how both network and service interworking are required, and how these must operate at the user, control, and management planes to enable profitable services to be delivered over the new converged network. The different solutions being defined in the standards bodies are described, and the distinct scenarios they address are explained. View full abstract»

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  • IEEE Communications Society Information

    Publication Year: 2005 , Page(s): 4
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  • Lightweight autonomic dissemination of entertainment services in widescale wireless environments

    Publication Year: 2005 , Page(s): 94 - 101
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (134 KB) |  | HTML iconHTML  

    The spread of wireless portable devices is opening new market opportunities to provide entertainment services to a growing number of potential users. A notable deployment scenario is represented by limited spatial regions, such as stadiums, railway stations, and airports, with a high number of simultaneously present mobile wireless peers (dense MANETs). The provisioning of entertainment services (e.g., the distribution of news, movie trailers, songs, and game components) in dense MANETs is a challenging task, hard to achieve in a scalable way with traditional static network infrastructures. We propose lightweight autonomic dissemination of entertainment services that exploits impromptu collaborations among mobile wireless peers to replicate resources in an efficient and lazily consistent way. In particular, we have developed the REDMAN middleware to manage, retrieve, and disseminate replicas of data/service components transparently from the point of view of service developers, thus facilitating the realization of widescale entertainment services. REDMAN implements novel lightweight solutions to identify dense MANETs, maintain the desired resource replication degree, and efficiently perform resource retrieval, by exploiting the assumptions of relatively high and almost constant node density to achieve scalability and limited network overhead. View full abstract»

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  • Product Spotlights

    Publication Year: 2005 , Page(s): 28
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  • Interleave-division multiple access and chip-by-chip iterative multi-user detection

    Publication Year: 2005 , Page(s): S19 - S23
    Cited by:  Papers (46)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (120 KB) |  | HTML iconHTML  

    This article outlines a multiple access scheme in which interleaving is the only means of user separation. As a special form of CDMA, the new scheme inherits many advantages of CDMA, such as dynamic channel sharing, mitigation of cross-cell interference, asynchronous transmission, ease of cell planning, and robustness against fading. Furthermore, it allows a low-cost interference cancellation technique applicable to systems with large numbers of users in multipath channels. Performance close to theoretical limits has been observed based on an unequal power control strategy. View full abstract»

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  • Technical challenges in the delivery of interprovider QoS

    Publication Year: 2005 , Page(s): 112 - 118
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (125 KB) |  | HTML iconHTML  

    Following a brief look at the motivations behind the move toward interprovider QoS, this article examines the technical challenges such a move presents. These challenges broadly fit into the related areas of service agreements and performance measurements. The background, requirements, concerns, and solution options for the topics of performance metrics, service classes, service requirements, performance measurements, and provider interconnection models are presented. In conclusion, we summarize the challenges and how they are being addressed. View full abstract»

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  • Advertisers' Index

    Publication Year: 2005 , Page(s): 160
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  • Entertainment Everywhere: System and networking issues in emerging network-centric entertainment systems: Part II

    Publication Year: 2005 , Page(s): 73 - 74
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  • Society News

    Publication Year: 2005 , Page(s): 10
    Cited by:  Papers (1)
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  • New Products

    Publication Year: 2005 , Page(s): 22 - 25
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  • TELSIKS through the years

    Publication Year: 2005 , Page(s): 2 - 4
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    First Page of the Article
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  • BerlinTainment: an agent-based context-aware entertainment planning system

    Publication Year: 2005 , Page(s): 102 - 109
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1531 KB) |  | HTML iconHTML  

    Service providers, especially in the mobile entertainment domain, are facing increasing competition. The ability to design, develop, and deploy unique context-aware entertainment services fast and easily as well as the capability to provide intuitive user interfaces becomes essential for market players. Furthermore, today's mobile world is made up of heterogeneous networks accessible via various devices with different characteristics. Progressive users have the desire to utilize the same services and access the same information content on all available devices. At the same time, service providers have to diversify their services in order to remain competitive and attract the various customer segments making up the mass market. We introduce an agent-based serviceware framework to assist service providers in developing innovative services, thus reducing the time to market of the respective applications. The realized serviceware framework offers personalization, location awareness, and the multi-access service platform, a flexible solution for ubiquitous service access. Thus, our solution allows a heterogeneous landscape of end devices to access an application server's mobile services in a multimodal, multilingual, and multimedia-based manner. We describe the utilization of the different modules of the service framework as well as the BerlinTainment application, an entertainment planning system based on the framework. View full abstract»

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  • Interprovider IP-MPLS services: requirements, implementations, and challenges

    Publication Year: 2005 , Page(s): 119 - 128
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (153 KB) |  | HTML iconHTML  

    With the worldwide success of IP-MPLS [E. Rosen et al., Jan. 2001] networks deployment, inter-connecting multiple provider IP-MPLS networks for global reachability becomes the next important step. Many providers have implemented MPLS interprovider connections. In this article we first briefly describe the drivers behind the need of interprovider IP-MPLS services, such as layer 3 VPNs [E. Rosen and Y. Rekhter, Oct 2004], pseudowire emulation for transporting layer 2 traffic over IP-MPLS, VoIP, and others. We then discuss the general requirements for the interconnections, from end users' and service providers' perspectives, including security, scalability, manageability, QoS, and end-to-end SLAs. We then address the deployment options and challenges faced by service providers. Specifically, we discuss the following areas of interprovider service implementation: protocol implementation options for L3 VPN and their trade-offs, methods for guaranteeing consistent QoS across providers' boundaries, interprovider traffic engineering approaches, and operation challenges: from business to processes, from troubleshooting/monitoring to SLAs. By identifying the issues and challenges, our ultimate goal is to move toward the development of much needed common practices and procedures to assist in the establishment of interprovider IP-MPLS services. View full abstract»

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  • IEEE Radio Communications Components, Systems and Networks

    Publication Year: 2005 , Page(s): 5 - s1
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  • Is the wireless industry ready for component based system development?

    Publication Year: 2005 , Page(s): s6 - s8
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (65 KB) |  | HTML iconHTML  

    First Page of the Article
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  • A new interprovider interconnect technology for multimedia networks

    Publication Year: 2005 , Page(s): 147 - 151
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (100 KB) |  | HTML iconHTML  

    This article describes a new method of enabling interprovider connectivity: disaggregating the application level gateway, or signaling function, from the media firewall, or packet handling function. Simulation results based on real-world traffic situations indicate that the processing required for handling signaling in multimedia networks depends much more on topology than the bandwidth of the media streams associated with the signaling. Thus, it is compelling to use an architecture that independently scales the signaling and media processing capacity of the interprovider interconnect for multimedia networks. View full abstract»

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  • A framework for investigating radio resource management algorithms in TD-SCDMA systems

    Publication Year: 2005 , Page(s): S12 - S18
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (137 KB) |  | HTML iconHTML  

    TDD-CDMA, globally recognized as the basis for Chinese 3G, is designed for symmetrical and asymmetrical 3G mobile services. As a time-division duplexing system, TD-SCDMA works in unpaired frequency allocations, supporting the flexible allocation of uplink/downlink slots in one carrier, and adapting to the different system loads between uplink and downlink. Dynamic time slot allocations make it more spectrally efficient than paired uplink/downlink carriers. Consequently, TD-SCDMA can make full use of the radio spectrum through optimal adaptive radio resource allocation. In order to support peak rates of 5 Mb/s or higher, the TD-SCDMA standard is enhanced via high-speed downlink packet access (HSDPA) mode. In this article the properties and strategies of radio resource management (RRM) are introduced, and the differences in admission control, power control, handover, load control, dynamic channel allocation, and adaptive HSDPA techniques between TDD-CDMA and the conventional FDD-CDMA system are analyzed. Some advanced strategies and architectures for TDD-CDMA RRM algorithms are presented. Since uplink multi-user detection (MUD) and smart antenna (SA) techniques are adopted in TD-SCDMA, the RRM algorithms based on MUD and SA are investigated further. In addition, these advanced RRM algorithms are characterized by an OPNET-based dynamical system-level simulator. View full abstract»

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  • Cross-layer scheduling strategy for UMTS downlink enhancement

    Publication Year: 2005 , Page(s): S24 - S28
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (122 KB) |  | HTML iconHTML  

    This article describes the benefits of including cross-layer information in the scheduling mechanism of a UMTS downlink channel. In particular, the information obtained from the fast power control algorithm is used to properly schedule transmissions. A prioritization function that exploits the short-term channel variations is proposed. This strategy is shown to be a feasible approach to improve system performance in terms of capacity and delay. This enhancement is obtained as a benefit of intrinsic multi-user diversity. The proposal is applicable within the current UMTS radio resource management framework. View full abstract»

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  • SatNEx: Satellite communications network of excellence

    Publication Year: 2005 , Page(s): 3 - 4
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    First Page of the Article
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  • A ubiquitous mobile communication architecture for next-generation heterogeneous wireless systems

    Publication Year: 2005 , Page(s): S29 - S36
    Cited by:  Papers (50)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (130 KB) |  | HTML iconHTML  

    Rapid progress in research and development of wireless networking and communication technologies have created different types of wireless systems (e.g., Bluetooth, IEEE 802.11, UMTS, and satellite networks). These systems are envisioned to coordinate with each other to provide ubiquitous high-data-rate services to mobile users. In this article, the architecture for ubiquitous mobile communications (AMC) is introduced that integrates these heterogeneous wireless systems. AMC eliminates the need for direct service level agreements among service providers by using a third party, a network interoperating agent. Instead of deploying a totally new infrastructure, AMC extends the existing infrastructure to integrate heterogeneous wireless systems. It uses IP as the interconnection protocol. By using IP as the gluing protocol, transparency to the heterogeneities of the individual systems is achieved in AMC. Third-party-based authentication and billing algorithms are designed for AMC. New mobility management protocols are also developed to support seamless roaming between different wireless systems. View full abstract»

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  • Challenges in enabling interprovider service quality in the internet

    Publication Year: 2005 , Page(s): 110 - 111
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (467 KB) |  | HTML iconHTML  

    First Page of the Article
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  • Introduction to the June supplement - Editorial

    Publication Year: 2005 , Page(s): s2
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    First Page of the Article
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  • Provisioning for interdomain quality of service: the MESCAL approach

    Publication Year: 2005 , Page(s): 129 - 137
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    This article presents an architecture for supporting interdomain QoS across the multi-provider global Internet. While most research to date has focused on supporting QoS within a single administrative domain, mature solutions are not yet available for the provision of QoS across multiple domains administered by different organizations. The architecture described in this article encompasses the full set of functions required in the management (service and resource), control and data planes for the provision of end-to-end QoS-based IP connectivity services. We use the concept of QoS classes and show how these can be cascaded using service level specifications (SLSs) agreed between BGP peer domains to construct a defined end-to-end QoS. We illustrate the architecture by describing a typical operational scenario. View full abstract»

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  • Network-centric music performance: practice and experiments

    Publication Year: 2005 , Page(s): 86 - 93
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (166 KB) |  | HTML iconHTML  

    Advances in information technology and the great proliferation of the Internet have changed nearly every aspect of the work and life of human beings. Despite progress in networked entertainment, many music professionals and enthusiasts are still sticking to the traditional way of carrying out rehearsals and concerts. Music performance in this way requires physical presence of the participants and has a number of inherent limitations. We introduce a novel system called network-centric music performance (NMP) that enables multiparty music performance through cyberspace. Our target is to support real-time multichannel natural audio streaming over the network, using audio compression schemes that can provide acceptable audio quality. A system like this is bandwidth-demanding and highly delay-sensitive, and requires synchronization of the audio streams. Hence, support from the underlying end systems and networks is critical. However, the current source coding mechanisms and the best effort nature of the internet pose many challenges to achieve the desired quality of service. We have implemented a prototype of NMP, and exploited end system and network influences on NMP. The work was done in a LAN environment using Linux PCs. The system enables two different application scenarios: real-time rehearsal and rehearsal on demand. Real-time multichannel audio transport and different audio compression schemes are supported. Our evaluation results based on both subjective and objective measurements show that the system provides sufficient audio quality level for the target application in such an environment. The scalability test also revealed that the system scales well with increase of clientele. In the future, we extend our system for networks spanning larger distances and experiment with more realistic network conditions in the Internet. View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

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Meet Our Editors

Editor-in-Chief
Osman Gebizlioglu
Huawei Technologies