By Topic

Communications Magazine, IEEE

Issue 4 • Date April 2005

Filter Results

Displaying Results 1 - 25 of 30
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Upper layer enhancements for fast call setup in cdma2000 revision D

    Page(s): 57 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (519 KB) |  | HTML iconHTML  

    Fast call setup (FCS) technology, a recent enhancement in revision D of cdma2000® in 3rd generation partnership project 2 (3GPP2), is a set of mechanisms for reducing call setup latency. FCS technology comprises MS tracking mechanisms, channel assignment procedures, paging mechanisms, and traffic channel initialization procedures. The combination of these techniques contributes to the improvement of the overall call setup delay. This article discusses the functional aspects of these enhancements, and their quantitative and qualitative performance. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computer Networking First-Step - [Book Review]

    Page(s): 8
    Save to Project icon | Request Permissions | PDF file iconPDF (410 KB)  
    Freely Available from IEEE
  • Power controlled H-ARQ in cdma2000 1×EV-DV

    Page(s): 77 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (486 KB) |  | HTML iconHTML  

    The newly applied H-ARQ technique in the reverse link of a cdma2000® 1×EV-DV system is shown to be similar in nature to the fast power control technique such that the two techniques both reduce interference to other users. In order to balance the H-ARQ gain and packet delay time, four modes of operation are defined: normal, reduction, boost, and boost reduction. The four modes are defined according to the way the channel gain is set for the H-ARQ operation. Simulation results show that the reduction modes have better performance in terms of both PER and packet delay time. It is also shown that the boost modes have lower PER and packet delay time than the non-boost modes, but at the expense of more energy. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The application-based clustering concept and requirements for intervehicle networks

    Page(s): 108 - 113
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB) |  | HTML iconHTML  

    A new network clustering concept for foresighted driving applications is introduced, taking into account the specific requirements for highly dynamic intervehicle networks. Considering the initially low system penetration in the market, the concept includes the so-called message relay boxes without backbone network connection for temporary roadside storage of messages. The article differentiates between moving and quasi-stationary applications and explains how clusters tied to specific geographic locations leads to even more complicated mechanisms for topology management in clustered ad hoc networks. A proposed message handling algorithm for cluster establishment shows the complexity needed to guarantee overall data consistency and network reliability as required for safety-relevant cooperative systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Cell capacity of LMDS systems in typical traffic scenarios

    Page(s): 122 - 129
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (531 KB) |  | HTML iconHTML  

    Broadband access and multimedia technologies are expected to be primary drivers for the telecommunications market of the next few years. The increasing bandwidth needs, together with the plethora of different services and heterogeneous traffic flows, requires accurate methodologies for resource dimensioning, especially in the field of wireless technologies where efficient bandwidth usage is crucial. New methodologies need to be based on up-to-date traffic source modeling and usage scenarios. Therefore, in this article, we propose a survey of statistical characterization of single traffic sources, QoS requirements and different traffic demands. When possible, we consider the aggregate traffic resulting from a large number of heavy tailed ON/OFF sources, relying on the theory of long-range dependent flows. This method is particularly useful when time- and resource-consuming simulations are needed in order to dimension the system resources, which is always the case in the multimedia scenarios of future networks. We use such a traffic framework to estimate by simulations the capacity of an LMDS system. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance evaluation of high-speed packet enhancement on cdma2000 1×EV-DV

    Page(s): 67 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (498 KB) |  | HTML iconHTML  

    During the last few years, the cdma2000® cellular system has undergone a major enhancement within the 3rd Generation Partnership Project 2. The objective of this enhancement was to improve the bandwidth efficiency of the cdma2000 system by creating a new set of high-speed packet data channels, the forward packet data channel and the reverse packet data channel. This new set of high-speed packet data channels utilize technologies such as fast packet scheduling, hybrid automatic repeat request, and adaptive modulation and coding. This article discusses the performance evaluation aspect of the high-speed packet enhancement of cdma2000 revisions C and D, the so-called 1×EV-DV system. Insights into how the performance evaluations of cdma2000 revisions C and D were conducted, and the results of these evaluations are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A framework for elastic QoS provisioning in the cdma2000 1×EV-DV packet core network

    Page(s): 82 - 88
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (533 KB) |  | HTML iconHTML  

    With the fast proliferation of QoS-enabled wireless packet networks, the need for effective QoS control is increasing. In this article, we focus on QoS provisioning in the cdma2000 1× evolution for high-speed integrated data and voice (1×EV-DV) packet core network. We investigate a dynamic bandwidth provisioning method that is able to increase a service provider's revenue. It is achieved by releasing unutilized bandwidth for use by other profitable services. The proposed method is implemented as an SNMP-compliant management information base and deployed at the packet data serving node. The experiments conducted on the LG Telecom 1×EV-DV testbed show that the method can increase the bandwidth for the conversational class and guarantee adequate service quality for the background class as well. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Broadband adoption in Europe

    Page(s): 18 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (453 KB) |  | HTML iconHTML  

    The widespread availability and adoption of high-speed broadband Internet access by consumers is increasingly viewed in all developed nations not only as a key driver of information and communication technology (ICT) capabilities, but also of the overall prosperity and well being of the economy of a developed nation. Developed nations are seeking to promote rapid deployment of broadband, coupled with rapid adoption by consumers. Some countries, notably the United States, have sought to rely on competition among multiple broadband media to achieve broadband deployment. Since cable deployments tend to be limited in most European countries, the European approach has been heavily dependent on procompetitive regulation in order to achieve intramodal competition. In this paper, the author discussed the broadband adoption in Europe. It details the upsurge in broadband technology as well as the regulatory and policy issues. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interference characteristics of broadband power line communication systems using aerial medium voltage wires

    Page(s): 92 - 98
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB) |  | HTML iconHTML  

    The promise of broadband power line (BPL) communications - broadband access to virtually every home in the United States - remains unfulfilled if the radio emissions from these systems cause significant harmful interference to other users of the wireless spectrum. This article presents an elementary analysis of the physical mechanisms underlying these emissions, from which the interference characteristics of BPL systems can be derived. Numerical models are evaluated for idealized systems using overhead medium-voltage wires, a configuration that is of particular interest for U.S. deployments. The central conclusions of the analysis are: (i) BPL interference is governed primarily by two parameters: signal power and electrical balance of system excitation; (ii) interfering emissions are typically confined to the immediate vicinity of the BPL wire, but long-range effects cannot be neglected; and (iii) measurements on an installed BPL system suggest that it is operating within, but very close to, the limits set by rules recently adopted by the Federal Communications Commission. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Parallel transport: a new transport layer paradigm for enabling Internet quality of service

    Page(s): 114 - 121
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (525 KB) |  | HTML iconHTML  

    The transport layer in the network protocol stack serves as a liaison between the application and the underlying network. Any quality of service provided by the network thus has to be effectively translated by the transport layer protocol in order to be enjoyed by the applications. In this article, we argue for a fundamental rethinking of the transport layer design to facilitate such QoS delivery. We identify the key requirement for a QoS enabling transport layer protocol as the ability to effectively handle multiplicity in terms of user differentiation levels, network resources, and service models. However, TCP, the transport layer protocol predominantly used in the Internet, is unable to support such multiplicity due to its single-state design. We extend TCP to a parallel transport layer protocol called parallel TCP (pTCP) that can tackle the different dimensions of multiplicity, and hence enable varying classes of QoS to applications. We discuss the applicability of pTCP in three specific domains with different levels of network support for QoS, and present simulation results substantiating our arguments. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reverse high-speed packet data physical layer enhancements in cdma2000 1×EV-DV

    Page(s): 41 - 47
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (499 KB) |  | HTML iconHTML  

    The rapid growth of Internet-based applications calls for design of a high-speed wireless packet data communication system. This anticipated increase in future mobile wireless packet data services has challenged the current 3G standardization bodies to respond with evolved 3G system specifications capable of providing increased data throughput. In response to such a need, 3GPP2 recently completed the enhanced reverse link standardization effort of the CDMA technology flagship, cdma2000® by completing the definition of the 1×EV-DV 1× system. 1×EV-DV achieves higher data throughput while simultaneously providing coexisting and backward-compatible voice services within the same spectrum. This feature of 1×EV-DV allows wireless operators to manage the voice and data loading in their system more efficiently. This article describes the physical layer reverse link enhancements in cdma2000 revision D that are necessary to support 1×EV-DV. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Advertisers' Index

    Page(s): 144
    Save to Project icon | Request Permissions | PDF file iconPDF (418 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fine granularity scalable video: implications for streaming and a trace-based evaluation methodology

    Page(s): 138 - 142
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (475 KB) |  | HTML iconHTML  

    Fine granularity scalability (FGS) is a new development in the area of video coding, which is designed to facilitate video streaming over communication networks. With FGS coding, the video stream can be flexibly truncated at very fine granularity to adapt to the available network resources. In this article, we introduce the communications generalist to the basic properties of FGS video coding to provide background for the design of video streaming mechanisms for FGS video. We then outline a methodology for evaluating streaming mechanisms for FGS encoded video. The methodology relies on traces of the rate-distortion characteristics of FGS encoded video and enables networking researchers and practitioners without access to video codecs and video sequences to develop and evaluate rate distortion optimized streaming mechanisms for FGS encoded video. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rreverse link high-speed packet data support in cdma2000 1×EV-DV: upper layer protocols

    Page(s): 48 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (515 KB) |  | HTML iconHTML  

    This article describes the design enhancements of the upper layers of the cdma2000® revision D standards [Mar. 2004] supporting high-speed wireless data on the 1×EV-DV reverse link. In revision D, the reverse link peak data rate has been increased by an order of magnitude from 153.6 kb/s to 1.8 Mb/s, and the reverse link sector throughput has been improved significantly (from about 280 kb/s to 600 kb/s). The key enabling mechanisms to achieve these enhancements include a hybrid automatic repeat request protocol, adaptive higher order modulation and coding schemes, and advanced radio resource management schemes. It is well known that the reverse link is interference limited, so the system resource of interest is reverse link interference. cdma2000 Revision D introduces a variety of flexible medium access control mechanisms to allocate appropriate reverse link resources for mobile stations with various service requirements. Moreover, cdma2000 revision D greatly enhances quality of service support for the reverse link. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 3G wireless and cdma2000 1× evolution in Korea

    Page(s): 36 - 40
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    The cdma2000® I×EV-DV system is designed to meet the ever-increasing demand for high-speed packet data transmission while providing the same level of revenue generated by conventional voice communications on existing cdma2000 1× systems. It supports concurrent voice and high-speed data on a single cdma 1.25 MHz carrier, and offers improved flexibility for operators to manage data and voice services cost efficiently. However, the Korean market has proved that providing higher bandwidth to the user does not guarantee the success of mobile data service. Users tend not to use expensive mobile wireless data services such as video streaming, video on demand, and MP3 music download service that they feel do not provide enough justification for their costs. The problem LG Telecom faces now as a mobile operator is not only to evolve technologies that enable various services, but also to find a way to provide attractive services at reasonable prices. This article describes experiences in the wireless data market in Korea as well as the market needs and driving forces for cdma2000 1×EV-DV developments. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • A scalable framework for in IP-oriented terrestrial-GEO satellite networks

    Page(s): 130 - 137
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (561 KB) |  | HTML iconHTML  

    The exponential growth of the Internet, the heterogeneity of networks, and the need for QoS maintenance have urged researchers to develop ideas for managing network scalability and end-to-end QoS assurance. In this article, an IP IntServ architecture in the satellite access network is combined with a scalable IP DiffServ-like architecture in the terrestrial core network. The proposed architecture aims at guaranteeing fine-grained bandwidth control in the satellite access network and stateless scalability in the core network, by exploiting per-aggregate traffic flow control, typical of the aggregate RSVP protocol, and stateless service assurance, typical of the SCORE approach. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Products

    Page(s): 26
    Save to Project icon | Request Permissions | PDF file iconPDF (420 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ad hoc peer-to-peer network architecture for vehicle safety communications

    Page(s): 100 - 107
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (551 KB) |  | HTML iconHTML  

    This article addresses the design of an architecture for ad hoc peer-to-peer networking of neighboring vehicles to help achieve near-instantaneous communication for safety applications such as collision avoidance warnings. We propose a local peer group (LPG) architecture to organize neighboring vehicles that have frequently changing neighbors and have no inherent relationships with one another. We study two architectural alternatives for LPG in this article, and consider areas of improvement for ad hoc vehicle networking protocols to support safety communications including multihop throughput, connection setup time, and configuration. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Society news

    Page(s): 10 - 14
    Save to Project icon | Request Permissions | PDF file iconPDF (998 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IEEE Communications Magazine

    Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (1738 KB)  
    Freely Available from IEEE

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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Sean Moore
Centripetal Networks