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Wireless Communications, IEEE

Issue 4 • Date Aug. 2003

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Displaying Results 1 - 9 of 9
  • Management of networks and services in a composite radio context

    Publication Year: 2003 , Page(s): 44 - 51
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (597 KB) |  | HTML iconHTML  

    This article adopts the assumption that different wireless access technologies (e.g., UMTS, HIPERLAN2, and DVB-T) can be cooperating components of a composite radio infrastructure. The coordinated management of services and network in this heterogeneous context is a complex task. This article presents a service and network resource management platform for wireless systems that operate in a composite radio context. Aspects addressed are the requirements, high-level platform design, functionality of the components that conduct monitoring, resource brokerage, service management, and network resource optimization. Indicative results are presented and concluding remarks provided. View full abstract»

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  • Transparent IP radio access for next-generation mobile networks

    Publication Year: 2003 , Page(s): 26 - 35
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (759 KB) |  | HTML iconHTML  

    Advances in network architecture, enhancements in signaling protocols, provisioning of end-to-end QoS, worldwide seamless mobility, and flexible service provision are among the major research challenges toward next-generation wireless networks. The integration and interoperability of all these technologies, along with new truly broadband wireless innovations and intelligent user-oriented services will lead toward the so-called 4G wireless networks. In this article we identify the key issues of an innovative transparent IP radio access system that targets 4G networks. View full abstract»

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  • Advanced adaptability and profile management framework for the support of flexible mobile service provision

    Publication Year: 2003 , Page(s): 52 - 61
    Cited by:  Papers (10)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (759 KB) |  | HTML iconHTML  

    The long-term vision of beyond 3G wireless communications describes a mobile service provision environment dramatically different from that of today. Users are expected to raise their demands to a significantly higher level, towards the situation-aware provision of ubiquitous personalized multimedia services. From this perspective, the need is emerging to apply, in a systematic way, adaptability and reconfigurability concepts for service delivery in largely diverse contexts. Generic dynamically extensible adaptation mechanisms that can be employed in a wide variety of situations and are independent of the subject and criteria of adaptation is a significant step in this direction. Moreover, effective profile representation and management becomes an increasingly important issue. In the present article we introduce an advanced adaptability and profile management framework aiming to fulfill these requirements. The proposed system has been designed, implemented, and incorporated in a distributed middleware platform for next-generation mobile service provision. View full abstract»

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  • OWSS: a new signaling system for 100-150-Mb/s wireless LANs

    Publication Year: 2003 , Page(s): 16 - 24
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (575 KB) |  | HTML iconHTML  

    Wireless local area networks have emerged as one of today's driving technologies, delivering high data rates on unlicensed spectrum. This article provides an overview of a new signaling system for high-bit-rate wireless LAN, made possible by a novel class of signaling pulses. Called OWSS pulses, they are generated through a combination of orthogonal wavelength-division multiplexing and spread-spectrum concepts. The system offers several advantages including intrinsic robustness to frequency-selective fading, effective equalization due, in part, to the wide spectrum and wide time-support of the pulses used, high data rate, and flexibility in carving different rates versus multiple access schedules at the physical layer. View full abstract»

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  • Managing IP traffic in radio access networks of next-generation mobile systems

    Publication Year: 2003 , Page(s): 36 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB) |  | HTML iconHTML  

    The strong research, standardization, and development activity currently focusing on the enabling technologies for the transition to a new generation of mobile networks represent a great opportunity to accomplish the goal of IP multimedia service provisioning to mobile users. This will contribute to the migration toward an all-IP platform with guaranteed end-to-end QoS provisioning, and will definitively fuel the deployment of new multimedia mobile applications and the further development of multimedia ubiquitous communications. This objective is not easily achievable, mainly due to the difficulties in handling IP multimedia applications in a mobile environment with a guaranteed QoS level. To contribute to this issue, in this article we discuss an evolutionary scenario from the current UMTS system to a next-generation QoS-aware mobile platform based on IP as the transport solution in the radio access network, UTRAN. Furthermore, we propose to fit the IntServ-over-DiffServ approach, in order to best manage the QoS level inside the UTRAN. View full abstract»

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  • On the financial impact of capacity-enhancing technologies to wireless operators

    Publication Year: 2003 , Page(s): 62 - 65
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    We explore the financial impact of new capacity-enhancing technologies involving the physical layer, in particular intelligent antennas and multiple input multiple output techniques. Using annual capital expenditure as an indicator of value to the operator, our results show that with aggressive data growth, capacity-enhancing technologies are key in securing the financial viability of the operator's business, while at the same time allowing for both unit price elasticity and positive net present value. They are hence crucial for operators that want to create demand for high data usage and/or gain market share. View full abstract»

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  • TDD-CDMA for the 4th generation of wireless communications

    Publication Year: 2003 , Page(s): 8 - 15
    Cited by:  Papers (38)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (586 KB) |  | HTML iconHTML  

    This article discusses an evolutionary TDD mode of CDMA-based path for 3.5G/4G systems. This technology has already been the basis of two 3G standards: TD-CDMA and TD-SCDMA with a synchronous uplink. Several techniques have been developed that allow TDD-CDMA-based systems to transmit at rates usually associated with 3.5G to 4G, up to 10-20 Mbit/s with wide area coverage. The present TDD-CDMA-based 3G standards are evolving to provide these higher rates, while fully retaining the coverage and mobility associated with, and expected from, the present mobile communications systems. This article discusses how TDD-CDMA specific techniques facilitate delivering services at data rates associated with 3.5G and 4G. We review how TDD-CDMA can provide for asymmetric uplink and downlink transmissions, facilitate deployment of advanced antennas for improved downlink coverage, and enable provision of advanced receiver techniques in base stations and mobiles. We also discuss how these techniques affect systems capacity in full packet-switched IP-based systems. We then discuss 4G TDD CDMA systems: those with different modulation techniques for uplink and downlink communications. These are generally based on a multicarrier mode of CDMA, and may incorporate OFDM technique. View full abstract»

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  • Unified Mobility Manager: enabling efficient SIP/UMTS mobile network control

    Publication Year: 2003 , Page(s): 66 - 75
    Cited by:  Papers (12)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (726 KB) |  | HTML iconHTML  

    Internet telephony is viewed as an emerging technology not only for wireline networks, but also for third-generation wireless networks. Although IP end to end is considered the ultimate approach to future wireless voice services, there is still a long way to go before IP voice packets can be effectively transported over the air. Therefore, Internet telephony and today's circuit-switched wireless network will coexist for years to come, and it is essential to effectively perform interworking between these networks. This article proposes the Unified Mobility Manager (UMM) that achieves efficient interworking between traditional wireless networks and Internet telephony networks. The main characteristic of the UMM is that it combines UMTS HLR and SIP proxy functionality in one logical entity, which helps eliminate the performance degradation due to interworking between SIP and UMTS. This article identifies seven potential network architectures with and without the UMM and with varying degrees of IP penetration in the wireless core networks, and performs comparative analysis in terms of their call setup signaling latency. Our performance results show that for SIP originated calls, the architecture with the UMM can achieve better performance than existing UMTS networks without the UMM. Our results further show that when the backbone network is fully IP-enabled, dramatic performance gains can be accomplished with the UMM for PSTN originated calls as well as for SIP originated calls. The article also demonstrates that the UMM allows graceful migration from today's circuit-switched wireless networks to hybrid SIP/circuit-switched wireless networks, and toward the IMS architecture for all-IP UMTS networks in the future. View full abstract»

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  • (R)evolution toward 4G mobile communication systems

    Publication Year: 2003 , Page(s): 6 - 7
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB) |  | HTML iconHTML  

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IEEE Wireless Communications Magazine deals with all technical and policy issues related to personalization, location-independent communications in all media.

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Editor-in-Chief
Hsiao-Hwa Chen
Cheng Kung University, Taiwan