• Title/Summary/Keyword: loosely-coupled networks

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A study to network access in modebile networks (이동 네트워크에서 네트워크 접속에 대한 연구)

  • Park, Sangjoon;Lee, Jongchan;Shin, Sungyun;Park, Gi-Hong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.679-680
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    • 2012
  • The B3G network architecture by the connection of access network is divided into two forms:tightly-coupled networks and loosely-coupled networks. In this paper, we consider the loosely-coupled networks in the internetworking architecture of mobile network.

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A study of architecture to network internetworing in modebile networks (이동 네트워크에서 망연동 구조에 대한 연구)

  • Park, Sangjoon;Lee, Jongchan;Shin, Sungyun;Park, Gi-Hong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.677-678
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    • 2012
  • The B3G network architecture by the connection of access network is divided into two forms:tightly-coupled networks and loosely-coupled networks. In this paper, we consider the tightly-coupled networks in the internetworking architecture of mobile network.

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WLAN-3GPP Integration Architectures for Packet Based Data Services

  • Raktale Swapnil K.;Kumar Ashok
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.2 no.3
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    • pp.48-60
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    • 2003
  • With the rapid successful deployment of WLANs worldwide in numerous hotspots for high data rate, wireless access for data services has created the need to integrate the Cellular Networks with WLAN Networks. The integrated wireless environment will provide the end user a much better service experience along with a single subscription and a single bill. In this paper we focus on inter-working approaches, which combine WLANs and Cellular Networks into an integrated wireless environment capable of ubiquitous access to data services and very high data rates in hotspots areas. We first list the key requirements which are currently being standardized within the 30PP for integration with WLANs networks. We discuss two inter-working architectures namely loosely coupled and tightly coupled This paper will detail the loosely coupled inter-working approach while briefly discussing the tightly coupled inter-working. Finally, we will conclude that the loosely coupled approach is evolutionary and less intrusive than the tightly coupled approach.

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A Delay Reduction Algorithm for Vertical Handover between WLAN and UMTS (WLAN과 UMTS 네트워크간의 수직적 핸드오버 지연 감소를 위한 알고리즘)

  • Kim, Byung-Gi
    • Journal of Internet Computing and Services
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    • v.6 no.5
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    • pp.123-132
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    • 2005
  • By complementary integration of WLAN and UMTS, a Beyond third Generation(B3G) mobile network can be constructed to establish the fastest global roaming environments, There are 2 types of B3G networks: loosely-coupled and tightly-coupled, A tightly-coupled network demands lots of investment and considerable amount of time to construct. On the other hand a loosely-coupled network is more scalable and easier to implement than a tightly-coupled one, But it has critical drawbacks of packet loss and blocking of services due to handover delay, To alleviate these drawbacks this thesis proposes a vertical handover procedure between WLAN and UMTS, which is based on MAP of HMIPv6, Performance of the proposal is evaluated in terms of blocking probabilities, The proposed procedure based on HMIPv6 shows better performance than those based on MIP.

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An Interworking Scheme for Fast Handoff between 3G and WiBro Networks (3G-WiBro 고속 핸드오프를 위한 연동방안)

  • Kim Seokhoon;Kim Cheolhong;Chang Hongsung;Ryoo Intae;Park Sung-Soo;Lee Donghauk;Chung Wonsuk;Cho Jinsung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.5B
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    • pp.264-273
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    • 2005
  • Nowadays the integration of heterogeneous wireless networks become a hot issue in communications research area. Especiall,y, 3G and WiBro interworking will be introduced soon as users can be offered the most suitable service according to service area and service providers can reduce network construction and operation expenses. In this paper, we propose an interworking scheme for fast handoff between 3G and WiBro networks. The SCI (Smoothly Coupled Integration) scheme proposed in this paper takes advantages of the existing LCI (Loosely Coupled Integration) and TCI (Tightly Coupled Integration) scheme and can offer seamless services by providing fast handoff between 3G and WiBro although each network may work independently. Through extensive computer simulations using OPNET, the efficiency of the proposed scheme has been validated.

Reliable Overlay Multicast with Loosely Coupled TCP Connections

  • Kwon, Gu-In;Byers, John
    • Journal of Communications and Networks
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    • v.11 no.3
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    • pp.306-317
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    • 2009
  • We consider the problem of architecting a reliable content delivery system across an overlay network using TCP connections as the transport primitive. We first argue that natural designs based on store-and-forward principles that tightly couple TCP connections at intermediate end-systems impose fundamental performance limitations, such as dragging down all transfer rates in the system to the rate of the slowest receiver. In contrast, the ROMA architecture we propose incorporates the use of loosely coupled TCP connections together with fast forward error correction techniques to deliver a scalable solution that better accommodates a set of heterogeneous receivers. The methods we develop establish chains of TCP connections, whose expected performance we analyze through equation-based methods. We validate our analytical findings and evaluate the performance of our ROMA architecture using a prototype implementation via extensive Internet experimentation across the PlanetLab distributed testbed.

Client-Server System Architecture for Inferring Large-Scale Genetic Interaction Networks (대규모 유전자 상호작용 네트워크 추론을 위한 클라이언트-서버 시스템 구조)

  • Kim, Yeong-Hun;Lee, Pil-Hyeon;Lee, Do-Heon
    • Bioinformatics and Biosystems
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    • v.1 no.1
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    • pp.38-45
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    • 2006
  • We present a client-server system architecture for inferring genetic interaction networks based on Bayesian networks. It is typical to take tens of hours when genome-wide large-scale genetic interaction networks are inferred in the form of Bayesian networks. To deal with this situation, batch-style distributed system architectures are preferable to interactive standalone architectures. Thus, we have implemented a loosely coupled client-server system for network inference and user interface. The network inference consists of two stages. Firstly, the proposed method divides a whole gene set into overlapped modules, based on biological annotations and expression data together. Secondly, it infers Bayesian networks for each module, and integrates the learned subnetworks to a global network through common genes across the modules.

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SCI Scheme for Hybrid 3G Networks (하이브리드 3G 네트워크를 위한 SCI 기술)

  • Kim, Gui-Jung;Kim, Seok-Hoon;Han, Jung-Soo
    • Proceedings of the Korea Contents Association Conference
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    • 2009.05a
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    • pp.677-681
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    • 2009
  • The Smoothly Coupled Integration (SCI) proposed in this paper takes only the strength of loosely coupled integration and tightly coupled integration. Furthermore, 3G network and WiBro network, which are coupled with SCI, have independent architecture which supports mobility and seamless services by fast handoff. Computer simulation with the use of OPNET marked excellence in performance of smoothly coupled integration.

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A Fibonacci Posterorder Circulants (피보나치 후위순회 원형군)

  • Kim Yong-Seok
    • Proceedings of the Korea Information Processing Society Conference
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    • 2006.05a
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    • pp.743-746
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    • 2006
  • In this paper, we propose and analyze a new parallel computer topology, called the Fibonacci posterorder circulants. It connects ${\Large f}_x,\;n{\geq}2$ processing nodes, same the number of nodes used in a comparable Fibonacci cube. Yet its diameter is only ${\lfloor}\frac{n}{3}{\rfloor}$ almost one third that of the Fibonacci cube. Fibonacci cube is asymmetric, but it is a regular and symmetric static interconnection networks for large-scale, loosely coupled systems. It includes scalability and Fibonacci cube as a spanning subgraph.

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Data Dissemination Protocol Supporting the Mobility for Tightly Coupled Sink Groups in Wireless Sensor Networks (무선 센서 망에서의 밀집 싱크 그룹을 위한 이동성 보장 데이터 전달 프로토콜)

  • Choi, Young-Hwan;Yu, Fu-Cai;Park, Soo-Chang;Lee, Eui-Sin;Kim, Sang-Ha
    • Proceedings of the Korean Information Science Society Conference
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    • 2007.10d
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    • pp.160-165
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    • 2007
  • 무선 센서 망에서 다중싱크 이동성에 관련된 연구는 단순히 독립된 단일싱크 이동성 확장에 기인한다. 하지만, 다중 싱크의 경우 싱크 상호간의 이동 결집도에 따라 두 가지 그룹으로 분류될 수 있다: 싱크간의 산재된 싱크그룹(loosely coupled sink group)과 밀집된 싱크그룹(tightly coupled sink group)이다. 전자는 기존 다중싱크 연구에서 가정하고 있는 일반적인 모델이다. 반면, 후자의 예로는 전쟁터에서 동일한 작전을 수행하는 작은 분대 단위의 군인들의 이동성 등이 있다. 본 논문은 밀집된 싱크그룹 이동성을 갖는 다중 싱크를 위한 데이터전달 프로토콜을 제안한다.

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