• KIPS Transactions on Computer and Communication Systems
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• v.1 no.3
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• pp.205-218
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• 2012

Mobility management of the mobile nodes and provision of seamless handover is crucial to an efficient support for the global roaming of the mobile nodes in next-generation wireless networks. Mobile IPv6 and mobility management in extended IP layer, which highly depend on traffic characteristics and user mobility models, were proposed by the IETF. Therefore, to evaluate the in-depth performance about these factors is important. Generally, the performance of IPv6-based mobility management protocol is evaluated through simulation. This paper shows the correlation between network parameters and performance metrics through numerical results, which is investigated how influence handoff latency and packet loss. And this paper uses mathematical analysis of the system parameters, such as the subnet residence time, the packet arrival rate and delay in wireless connection through the analytical framework which evaluate the performance of IPv6-based mobility management protocol.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.282-284
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• 1998

차세대 무선 이동통신인 IMT-2000(International Mobile Telecommunication 2000)의 고유 서비스들 중 하나인 글러벌 로밍 서비스는 전 세계의 단일 표준안에 따라서 서로다른 IMT-2000훼밀리 멤버들 간에 로밍을 가능하게 한다는 개념이다. 본 논문에서는 글로벌 로밍의 네트워크 측면의 기능들 중에서 이동성과 밀접한 관련이 있는 위치 정보관리 서비스와 위치 정보 관리 기능을 정의하였다. 본 연구의 결과는 상용화를 앞에 두고 있는 IMT-2000 망의 운용자가 효율적인 글로벌 로밍 서비스를 제공할수 있게 하는 망 관리 수단의 기반이 될 것이다.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.257-260
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• 1998

In this paper, we describe an IMT-2000 system architecture, a protocol stack, and basic MAP scenarios(e.g., registration, call delivery) based on the IS-41 and IS-41 and IS-751. This paper focuses on the MAP scenarios to support the IMSI which is defined for the global roaming between GSM and IS-41 Networks through the Family of System approach. This paper also deals with the design of the MAP protocol stack transported over the ATM networks and introduces the software structure of MAP in IMT-2000 MSC.

• Journal of the Korean Professional Engineers Association
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• v.42 no.4
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• pp.34-39
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• 2009

IMT-2000 service started around year of 2000 to support global roaming with high speed data rate. But 3GPP and 3GPP2 could not narrow gaps between them to make separate specification. To make it worse, economy regression delayed deployment. Starting 2007, WCDMA, standardized in 3GPP, was launched in Korea by KT and SKT. 3GPP introduced HSDPA and HSUPA as an enabler for high speed down and uplink packet service, in release5 and release5, respectively.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.422-425
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• 2003

Software reconfigurable radio will give future users a number of benefits like global roaming, multi mode, multi band, and multi standard. It will also offer complete programmability and reconfigurability to both multi mode and multi functional communication terminal and network nodes. This configuration will be implemented by application of different combination of radio configurable software. In this paper, It proposes the algorithm needed for reconfiguration with basic explanation of the software download. A description of an implementation such reconfiguration processes as partial download and full download and critical and non-critical download installation using the registration table in included.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2000.11a
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• pp.25-44
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• 2000

The purpose of this article is to analyse the policy-making process concerning the selection of providers for IMT-2000, the global roaming communication services in Korea by adopting the new institutional approach. It is supposed to contribute to understanding the characteristic of the policy process in the field of information and communication. We can see the durability of institution through the process that the government lost its policy credibility by using the intervention instrument rather than letting go in the market place.

• Journal of KIISE:Information Networking
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• v.31 no.6
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• pp.566-572
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• 2004

In this paper, we define the secure authentication model to provide a mobile node with global roaming service and integrate the Fast Handoff scheme with our approach to minimize the service latency. By starting the AAA(Authentication, Authorization and Account) procedure with Fast Handoff simultaneously when a roaming occurs, authentication latency is reduced significantly and provision of fast and seamless service is possible. The previous works such as IPsec(Internet Protocol Security), RR (Return Routability) and AAA define the procedures performed after the completion of Layer2 Handoff which leads us to study a way of providing the real time and QoS guaranteed service during this period. The proposed scheme is for this goal and when appling it to roaming environment it shows the cost reduction up to 55% and 17% for the case of the MN receiving the FBACK and not respectively before L2 Handoff occurs.

• Journal of Digital Convergence
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• v.12 no.12
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• pp.37-47
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• 2014

The characteristics of the spectrum, which are necessary for mobile telecommunication services, may determine the advantage of operators' competition for mobile services. We have a focus on the possibility that there would be the core spectrum within the frequencies. We define the core spectrum of frequencies in terms of 4 criteria (global source/roaming, cost-effectiveness, the experience of utilization and the possibility of use). They are based on the aspects of applicative and economic effectiveness by not technological and but market conditions. We have explored the current core spectrum by using the stepwise selection from these criteria. Our result indicates that the core spectrum may be movable with the development of technology and the flow of time. The results of this paper could be practically used as the reasonable justifications of the policies for not only the competition management but also the alignment about the frequencies for mobile telecommunication.

• Journal of Korea Multimedia Society
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• v.9 no.10
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• pp.1314-1321
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• 2006

GSM(Global System for Mobile Communications) is a Pan-European digital cellular mobile system supporting widespread roaming and personal communication services in a worldwide wireless communication network. In suite of providing security capability, however, there are some problems like user authentication in GSM. In this paper, we propose the enhanced authentication mechanism to verify strongly each network entity to so]ye user authentication problem and support anonymity for user privacy.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.187-188
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• 2006

In CDMA based mobile communication network, signaling messages are routed through Signaling Transfer Point(STP) which is responsible for MTP layer 3 switching. As WCDMA based UMTS network is considered as next generation technology allowing global roaming services, all nodes in networks have their own identity number called Global Title(GT). Therefore, it is essential to introduce Signaling Gateway(SG) responsible for SCCP layer switching to solve the problem each node has all GT tables including even all overseas nodes. In this paper, we propose the signaling network architecture in UMTS networks using SG and we show that we can reduce CAPEX and OPEX in each node. To show the validity of the proposed method some simulations are given in which the results can be expected by intuitive observation.