• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.4
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• pp.1344-1367
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• 2014

Mobile traffic is increasing a masse because of the propagation of the Internet and the development of wireless mobile technology. Accordingly, the Network Local Mobility Management (NETLMM) working group [1] of the Internet Engineering Task Force (IETF) has standardized Proxy Mobile IPv6 (PMIPv6) [2] as a protocol for accomplishing the transmissibility of mobile terminals. PMIPv6 is a network-led IP-based mobility management protocol, which can control terminal mobility without depending on the type of access system or the capability of the terminal. By combining PMIPv6 and the mobility of Session Initiation Protocol (SIP), we can establish terminal mobility and session mobility through a more effective route. The mobility function can be improved and the overlap of function reduced as compared to that in the case of independent operation. PMIPv6 is appropriate for a non-real-time service using TCP, and SIP is appropriate for a real-time service using RTP/UDP. Thus, in the case of a terminal using both services, an effective mobility management is possible only by using PMIPv6 together with SIP. In order to manage mobility in this manner, researches on PMIPv6-SIP are in progress. In line with this trend, this paper suggests a new PMIPv6-SIP architecture where when a mobile terminal conducts a handover, a network-led handover while maintaining the session without the addition of a special function or middleware is possible along with effective performance evaluation through mathematical modeling by comparing the delay and the packet loss that occur during the handover to the Pure-SIP.

• International journal of advanced smart convergence
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• v.4 no.1
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• pp.71-87
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• 2015

Mobile users want to be provided with undisrupted network services when they navigate on the Next-Generation (NG) wireless networks. For that, interlocking with a heterogeneous network is important, but there have been few studies on the method for guaranteeing global mobility. Thus, this paper proposes the Proxy-LMA technique, the mobile IP-based global inter-networking system, to enhance global mobility and interoperability within the Next-Generation (NG) network environment. The purpose of the proposed Proxy-LMA system is to expand the boundary of the mobility with regards to the existing mobility management protocol (PMIPv6 and MIPv6) in order to guarantee global mobility and interoperability within the heterogeneous network environment. The results of the performance evaluation showed that the proposed Proxy-LMA system was more efficient than other methods from the standpoint of signaling cost and delay in the heterogeneous network environment.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.1268-1269
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• 2007

차세대 이동통신 네트워크는 3G 진화망, 차세대 무선랜, WiMAX/WiBro 등 다양한 무선 접속 기술이 All-IP 기반 핵심망에 연결되어 통합되는 형태로 발전하고 있으며 무선 접속 기술의 커버리지에 따라 이기종 무선망이 중첩되어 운영될 수 있으나, 이에 대한 사항은 고려되고 있지 않은 상황이다. 이에 따라 4G 를 위한 차세대 네트워크와 현존하는 이기종 인터페이스를 지원하는 서비스 프레임워크가 요구되는 실정이다. 본 논문에서는 현재 사용되는 MIPv4 를 기반으로 하는 이기종 무선서비스 프레임워크를 위한 Hand-off 상황에 따른 패킷손실을 최소화 하는 방안을 제안한다.

• Journal of Internet Computing and Services
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• v.14 no.5
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• pp.11-26
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• 2013

In the wireless Internet, it is so restrictive to use the IPSec. The MIPv4 IPSec's path cannot include wireless links. That is, the IPSec of the wireless Internet cannot protect an entire path of Host-to-Host connection. Also wireless circumstance keeps a path static during the shorter time, nevertheless, the IKE for IPSec SA agreement requires relatively long delay. The certificate management of IPSec PKI security needs too much burden. This means that IPSec of the wireless Internet is so disadvantageous. Our paper is to construct the Mobile IPSec proper to the wireless Internet which provides the host-to-host transport mode service to protect even wireless links as applying excellent WP-IBE scheme. For this, Mobile IPSec requires a dynamic routing over a path with wireless links. FA Forwarding is a routing method for FA to extend the path to a newly formed wireless link. The FA IPSec SA for FA Forwarding is updated to comply the dynamically extended path using Source Routing based Bind Update. To improve the performance of IPSec, we apply efficient and strong future Identity based Weil Pairing Bilinear Elliptic Curve Cryptography called as WP-IBE scheme. Our paper proposes the modified protocols to apply 6 security-related algorithms of WP-IBE into the Mobile IPSec. Particularly we focus on the protocols to be applied to construct ESP Datagram.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.2109-2112
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• 2003

Diameter-MIPV4 프로토콜은 기존 Mobile IP(MIP)의 취약한 키 분배 문제를 해결하고 이동노드에 대해 인증 및 권한 검증, 과금 서비스 등을 지원함으로써 보다 개선된 보안 메커니즘을 제안하고 있다. 그러나 흠 망의 Diameter 서버에 의해 인증 및 등록이 수행된 후 공중망을 통해서 이동노드에게 세션키를 분배하는 것은 많은 보안상 공격에 노출될 수 있으며 원격지 도메인간의 빈번한 등록 메시지 교환은 통신 지연을 야기 시킬 수 있다. 본 논문에서는 안전한 세션키 분배를 위해서, 이동 노드의 등록 수행 과정 중 홈 망과 방문 망 사이에 IPsec(IP security) 터널을 구축함으로써 공중망에서의 세션키 유출 위협을 감소시켰다. 또한 네트워크의 계층성과 Micro-Mobility MIP 메커니즘을 이용하여 동일 도메인 내에서의 핸드오프 시 이동 노드의 인증 및 등록, 세션키 분배를 지역화 함으로써 통신 지연 문제를 효율적으로 개선하였다.

• Journal of KIISE:Information Networking
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• v.34 no.1
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• pp.62-72
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• 2007

Mobile Virtual Private Network (MVPN) provides VPN services without geographical restriction to mobile workers using mobile devices. Coexistence of Mobile IP (MIP) protocol for mobility and IPsec-based VPN technology are necessary in order to provide continuous VPN service to mobile users. However, Problems like registration failure or frequent IPsec tunnel re-negotiation occur when IPsec-based VPN Gateway (GW) and MIP are used together. In order to solve these problems, IETF proposes a mechanism which uses external home agent (x-HA) located external to the corporate VPN GW. In addition, based on the IETF proposal, a mechanism that assigns x-HA dynamically in the networks where MN is currently located was also proposed with the purpose to reduce handover latency as well as end-to-end delay. However, this mechanism has problems such as exposure of a session key for dynamic Mobility Security Association (MSA) or a long latency in case of the handover between different networks. In this paper, we propose a new MVPN protocol in order to minimize handover latency, enhance the security in key exchange, and to reduce data losses cause by handover. Through a course of simulation, the performance of proposed protocol is compared with the existing mechanism.

• Journal of KIISE:Information Networking
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• v.33 no.1
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• pp.38-48
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• 2006

For extending of hot-spot of WLAN, (2) proposes internetworking scheme between wireless LAN (WLAN) and mobile ad-hoc network (MANET), which employ the same layer-2 protocol with different mode. Compared to internetworking schemes between UMTS (Universal Mobile Telecommunications Systems) and WLAN (3-4), the scheme from (2) has relatively low overhead and latencies because WLAN and MANET are physically and logically similar to each other. However, the mode switching algorithm proposed in r2] for internetworking between WLAN and MANET only considers signal strength and determines handoff, and mobile nodes following a zigzag course in pollution area may perform handoff at short intervals. Furthermore, (2) employs mobile IPv6 (MIPv6) at base, which brings still high delay on handoff and overhead due to signal message exchange. In this paper, we present optimized internetworking scheme between WLAN and MANET, modified from (2). To settle ping-pong handoff from (2), we propose adaptive mode switching algorithm. HMIPv6 is employed for IP connectivity and mobility service in WLAN, which solves some shortcomings, such as high handoff overhead and vulnerable security. For routing in MANET, OLSR is employed, which is a proactive Protocol and has optimally reduced signal broadcasting overhead. OLSR operates with current P protocol compatibly with no change or modification. The proposed internetworking scheme based on adaptive mode switching algorithm shows better performance than scheme from (2).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.1030-1034
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• 2009

IPv6 and Ubiquitous Healthcare Environment (UHE) has become a main stream of the next generation technologies. IPv6 is designed in many ways with enhanced features such as a routing, mobility, scalability, QOS and security as a replacement of IPv4. Also, UHE is developed to provide patients with convenience and efficient healthcare services using the remote home healthcare system. However, IPv4 currently used as an Internet protocol does not have enough capability to fully support UHE. It may result in a restricted implementation of UHE. As a result, research on IPv6 implementations in UHE is increasingly becoming an issue within the healthcare industry. IPv6 has enhanced features to implement the remote healthcare system such as Neighbour Discovery process and address auto-configuration. In this paper, a basic of IPv6 and UHE will be firstly introduced and secondly, benefits brought by IPv6 in UHE will be discussed. In addition, security issues in IPv6 will be analysed to conclude this paper.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1149-1152
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• 2003

최근 인터넷 멀티미디어 트래픽 증가 및 IP 이동성에 대한 요구의 증가로 인하여 모바일 환경에서 효율적인 멀티미디어 서비스에 대한 필요성이 증가하고 있다. 이동 사용자에게 무선단말을 통해 인터넷 방송과 같은 멀티미디어를 제공하는 서비스는 차세대 네트워크에서 보다 일반적인 서비스형태가 될 것이며 이를 위해 무선 대역폭의 효율적인 활용을 위한 멀티캐스트 기술은 현재보다 활발히 사용될 것으로 예상된다. 이와 같은 점을 고려할 때 모바일 환경에서의 효율적인 멀티캐스트 프로토콜의 개발은 필수적인 요소이며 특히 방대한 멀티캐스트의 개념을 채택하고 있는 IPv6 환경에서 더욱 중요한 의미를 갖는다 할 것이다 현재 IETF 에서 Mobile IPv4와 IPv6를 위해 두 가지 이동 멀티캐스팅 방법을 제시하고 있으나, 각 방식은 많은 개선의 여지를 보이고 있을 뿐 아니라 IPv6의 멀티캐스트 개념을 적절히 반영하지 못하고 있다. 따라서, 본 논문에서는 Mobile IPv6 환경에서 새로운 이동 멀티캐스트 스킴을 제안한다. 제안된 방법은 IETF 의 두 방식에 대한 단점을 보완함과 동시에 이동 호스트가 방문하는 포린 링크에 어떠한 추가적인 기능을 요구하지 않으며 MIPv6 설계 요구사항을 최대한 반영하므로 최소한의 수정만으로 구현 가능한 장점을 가진다.

• Journal of Internet Computing and Services
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• v.9 no.4
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• pp.29-41
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• 2008

Currently, IETF MANEMO(Mobile Adhoc for NEMO) working group is working on standardization supporting internal routing in nested NEMO networks. Nested NEMO has a independent topology feature that Mobile IP and basic NEMO protocol did not caused. This is the reason that causes exceptional mobility pattern. Such mobility patterns also trigger each other reconfiguration requirements. This paper classified and analyzed probable new mobility patterns in nested NEMO network. In concludion, we derived configuration problem from the new mobility patterns and suggested differential reconfiguration requirements through analytical approach.