• Journal of KIISE:Information Networking
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• v.32 no.6
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• pp.687-695
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• 2005

With increasing demand of using mobile Internet, HMIPv6 is proposed by IETF to reduce location management traffics due to micro mobility and to provide IP-based movement. A paging mechanism combined with HMIPv6 can reduce the signaling traffics of a mobile node. We propose a dynamic paging mechanism in HMIPv6 which decides an optimal paging area for each mobile node by considering its characteristics. Total costs of a static paging mechanism and a dynamic paging mechanism are analyzed by mathematical formulas. As a result, we proved that the dynamic paging mechanism reduced total signal traffic costs more than a static paging mechanism.

• The KIPS Transactions:PartC
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• v.12C no.2 s.98
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• pp.235-242
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• 2005

As the demands in a wireless network are recently increasing, it is necessary to promote the power efficiency of a wireless terminal, and to reduce the overhead of a network. To resolve such problems, we propose the paging technology and the structure of paging area with the joint access point in HPi (High-speed Portable Internet) network, which is being studied as the domestic next-generation IP packet data network. The application of the paging technology to the HPi network possesses the advantage of reducing the registration cost while a terminal in dormant state moves around, and the reporting cost of the terminal's location by the joint access point. The technology suggested in this paper causes the advantages that it promotes the power efficiency in user's point of view while it reduces the network overhead and makes the easy rearrangement of joint APs according to the changes of users' moving pattern in the network manager's point of view.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.509-511
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• 2003

최근 이동 통신 환경에서의 인터넷 서비스의 요구가 늘어남에 따라 IP의 이동성 지원에 대한 연구가 활발히 진행되어 왔다. 본 논문은 IP 이동성 지원을 위한 프로토콜 중 IETF(Internet Engineering Task Forces)에서 현재 표준화가 진행중인 HMIPv6(Hierarchical Mobile IPv6 Mobility Management)[4]가 가지는 부하 분산 문제를 수평적인 MAP(Mobility Anchor Point) 구조를 통해 해결하고, 이 구조에서의 페이징 지원 방안을 제안하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12A
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• pp.964-974
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• 2003

With increasing use of a personal mobile computer. the Mobile IPv6 is one of the main protocols that support mobility and complies with IPv6 specification. Similar to the mobile IPv6, the mobile IPv6 also has limitations on fast moving condition. The Hierarchical Mobile IPv6 is a solution that overcomes these limitations. The Hierarchical Mobile IPv6 is a micro mobility protocol that supports fast mobile IP handover and reduces signaling overhead with Mobility Anchor Point(MAP). But until now no paging method is applied to the Hierarchical Mobile IPv6 to reduce unnecessary signaling overhead and power consumption of mobile nodes. So, the paging mechanism for the Hierarchical Mobile IPv6 is proposed in this paper. the mechanism is implemented by making use of the destination option header and extension function and the last location algorithm. The results show that the Hierarchical Mobile IPv6 with the paging ability reduces the traffic of mobile networks by removing unnecessary binding update packet generated whenever handover takes place. Also, the larger the paging size is. the less the number of BU(Binding Update) massage generated.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.9
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• pp.1999-2007
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• 2010

Proxy Mobile IPv6(PMIPv6) is a network-based mobility management protocol and it does not require mobile node's involving in mobility management. In PMIPv6, the Mobile Access Gateway (MAG) incurs a high signaling cost to update the location of a mobile node to the remote Local Mobility Anchor (LMA) if it moves frequently. It may cause excessive signaling traffic and increase a high traffic load on LMA. Therefore, we propose a new mobility management scheme in proxy mobile IPv6 networks with dynamic paging support. To minimize signaling overhead, in our proposal, the size of the paging area is determined dynamically according the changes of mobility and traffic patterns of the mobile node. An analytic model is applied to determine the optimal size of the paging area. The cost analysis using fluid flow model presented in this paper shows that our proposal can achieve performance superior that of PMIPv6 scheme.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.6B
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• pp.573-587
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• 2003

Due to the growth of mobile communication and the popularization of Internet, it is expected that wired and wireless communication network of the next generation will be integrated and flourished with IP-based. There have been a great deal of research efforts to provide mobile IP service onthe existing lower layer. The location update and the paging scheme is one of the most challenging technical issues for this topic. In this thesis, a paging method based on the distance-based location update scheme is proposed for IP network to support mobility in layer 3. The proposed scheme is implemented and verified with the OPNET.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.1
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• pp.69-78
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• 2001

This paper presents the design and FPGA implementation of a FLEX PSP(Protocol Signal Processor) for the portable high speed paging system. In this approach, two algorithms are newly proposed for implementing the PSP which provides capabilities of the maximum 6,400bps at speed, high-channel throughput, real time error correction and an effective frame search function. One is an accurate symbol synchronization algorithm which is applied for synchronizing the interleaved 4-level bit symbols which are received at input stage of A/D converter, and the other is a modified fast decoding algorithm which is provided for realizing double error correction of (31,21)BCH signal. The PSP is composed of six functional modules, and each module is modelled in VHDL(VHSIC Hardware Description Language). Both functional simulation and logic synthesis have performed for the proposed PSP through the use of Synopsys$^{TM}$ tools on a Axil-320 Workstation, and where Altera 10K libraries are used for logic synthesis. From logic synthesis, we can see that the number of gates is about 2,631. For FPGA implementation, timing simulation is performed by using Altera MAX+ PLUS II, and its results will be also given. The PSP which is implemented in 6 FPGA devices on a PCB has been verified by means of Logic Analyzer.r.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.971-974
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• 2006

핸드오프가 자주 발생할 경우 모바일IP에서 제어 메시지가 많이 발생하게 된다. 이러한 문제를 해경하기 위해서 마이크로 모빌리티 프로토콜이 제안되었다. 이 논문에서 마이크로 모빌리티 환경에서 안전한 멀티캐스팅 서비스를 제공하기 위한 방법에 대해 소개한다. 먼저 마이크로 모빌리티 환경에서의 멀티캐스팅 서비스 프로토콜을 소개하고 이 프로토콜을 기반으로 보안 서비스를 추하한다. 제안된 멀티캐스트 라우팅 프로토콜은 공유 멀티캐스트 트리를 만들고 다른 유니캐스트 마이크로 모빌리티 프로토콜을 고려하지 않는다. 추가된 보안 서비스는 인증, 권한, 기밀성, 그리고 완전무결성이 대칭이나 비대칭 암호와 알고리즘을 기반으로 하여 포함되어 있다. 또한 보안 프로토콜은 그룹의 멤버가 자주 바뀌고 핸드오프가 일어나는 현상을 다루기 위하여 페이징 지역을 기준으로 계층적 키 구조를 사용한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.131-140
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• 2011

Proxy Mobile IPv6 (PMIPv6) is designed to provide a network-based localized mobility management protocol, but it does not handle the global mobility of hosts. In this paper, we propose a location management scheme based on Domain Name System (DNS) for PMIPv6. In this proposed scheme, DNS as a location manager provides PMIPv6 for global mobility. In addition, a paging extension scheme is introduced to PMIPv6 in order to support large numbers of mobile terminals and enhance network scalability. To evaluate the proposed location management scheme, we establish an analytical model, formulate the location update and the paging cost, and analyse the influence of the different factors on the total signalling cost. The performance results show how the total signal cost changes under various parameters.

• Journal of Korean Society of Transportation
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• v.14 no.3
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• pp.173-190
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• 1996

본 논문에서는 최근 차량의 급격한 증가로 인해 더욱 더 가중되고 있는 도시내 교 통혼잡 완화를 위한 하나의 현실적 대안으로 무선 호출망을 이용한 ATIS (첨단 교통정보시 스템)의 구체적 구현방안을 제시하였다. ATIS를 위한 통신매체로서 무선 호출망을 사용하는 것은 다음과 같은 잇점을 갖는다. (1) 교통정보의 동시전송 가능 및 이를 통한 무선채널의 경제성 제고, (2) 간단한 망접속 절차 및 송수신의 안정성, (3) 하드웨어 및 통신비용의 저 렴, 시스템 구현 및 시험을 위해 무선 호출망을 이용한 교통정보 전송 프로토콜 및 시험용 전자지도를 개발하였으며, 이의 실용화를 위한 교통정보 서버 및 무선 호출망을 이용한 교 통정보 전송 프로토콜 및 시험용 전자지도를 개발하였으며, 이의 실용화를 위한 교통정보 서버 및 무선 호출망과 연동되는 차량내 교통정보 단말장치를 개발 중에 있다. 실현 가능성 시험을 위한 PROTOTYPE 시스템을 개발하였으며, 이를 이용해 시험적인 실제 무선 호출망 을 통해 가상 교통정보 송수신 시험을 하여 만족할만한 결과를 얻었다. 또한, 향후, 시스템 의 지능화를 위해서 교통사건에 의한 교통량변화 모델링을 위한 기본적인 사항들을 연구, 이에 관해 기술하였다. 제안 시스템의 성능 개선 및 지능화, 실제 적용을 위해 계속적인 연 구를 진행 중에 있으며, 이를 통해 미비점이 좀 더 보완되면 기존 무선 통신망을 이용한 ATIS 구현의 좋은 사례가 될 것으로 사료된다.