• Journal of KIISE:Computing Practices and Letters
• /
• v.13 no.1
• /
• pp.1-10
• /
• 2007

An advantage of the mobile ad hoc network (MANET) is that mobile nodes can self-organize the network topology without the help of network infrastructure. However, for the perfect self-organization of the MANET, each mobile node needs to self-configure its address. Even though a mobile node configures a unique address during the booting time, its address may conflict with nodes in other MANETs since MANETs containing the same address can be merged. The address autoconfiguration protocol implemented in this work consists of the strong DAD (Duplicate Address Detection) and the weak DAD. A unique address of a node is assigned by the strong DAD during the booting time and the weak DAD is used to detect address conflict and resolve address conflict during the ad hoc routing. In this work, we have implemented address autoconfiguration in the IPv6-based MANET using AODV as the routing protocol. We describe how the IPv6 address autoconfiguration is implemented and verify our implementation by showing the test scenarios on our testbed.

• Proceedings of the Korean Information Science Society Conference
• /
• 2000.04a
• /
• pp.283-285
• /
• 2000

현재의 인터넷은 IPv4를 기반으로 하며, CIDR(Classless InterDomain Routing)을 이용하여 IP의 고갈을 막으려고 노력하고 있다. 그러나, 이는 근본적인 대책이 아니기 EOans에 IP는 점차 고갈되어 미래에는 IPv6로 옮겨갈 것으로 보인다. 이렇게 IPv6로 발전함에 따라 IP 주소는 매우 늘어날 수 있으나, source 주소와 destination 주소의 헤더가 커짐에 따라 헤더의 IP 주소를 모두 읽어보는 데에 많은 비용(cost)이 들게 된다. 따라서, ISP들은 MPLS(Multiprotocol Label Switching)를 사용하게 될 것이다. 또한, MPLS는 기존의 IP 주소를 이용한 라우팅은 경로를 찾기 위해 필요이상으로 많은 정보를 요구한다고 보고, 레이블 개념을 도입하여 스위칭해주는 역할을 한다. 이렇게 하면 라우팅을 위해 IPv6로 인하여 더욱 길어진 IP 주소를 요구하지 않고 단지 레이블을 붙임으로 속도를 향상시킬 수 있다. 이러한 환경에서의 이동 IP는 COA를 얻게되면 레이블을 붙여서 목적지까지 전달되게 된다. 이렇게 전달되는 이동 IP에서 COA와 레이블을 합쳐서 하나로 보내는 방식으로 이동 IP의 효율을 높일 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.26 no.9A
• /
• pp.1475-1484
• /
• 2001

본 논문에서는 최근 이슈가 되고 있는 Mobile-IPv6에서의 새로운 smooth 핸드오프기반의 이동 멀티캐스트 데이터그램 전달 기법을 제안하고 이에 대한 성능을 평가한다. 제안된 알고리즘은 긴 라우팅 경로가 문제였던 Mobile-IPv4에서의 문제를 해결한 Mobile-IPv6를 기초로 하며, Mobile-IPv6 적용시 멀티캐스트 데이터그램 서비스를 운용하는데 요구되는 여러 성능 척도하에서 성능을 평가한다. 새로운 프로토콜의 핵심요소는 멀티캐스트 데이터그램 전달 경로를 줄이기 위해 MDA (Multicast Delivery Agent)를 도입한 것이다. 제안된 프로토콜은 현재까지 제안된 이동망에서의 멀티캐스트 지원 기법 등과 비교하여, 짧은 라우팅 경로 및 이동 호스트에 근접한 노드에서 이동 호스트로의 직접 데이터그램 전송을 통하여 성능 향상을 기대할 수 있다. 특히, 터널링 수 및 멀티캐스트 데이트그램의 평균 라우팅 길이가 줄었으며, 또한 멀티캐스트 트래픽 부하도 감소하였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.04d
• /
• pp.337-339
• /
• 2003

NGN 시대가 될수록 이동성을 지원하면서 네트워크를 효율적으로 이용하는 기술이 요구된다. Mobile Ipv6은 이와 같은 요구조건을 만족시키는 좋을 방법이다. 본 논문에서는 이동호스트가 핸드오버를 수행할 때 발생하는 Triangle Routing 오버헤드를 감소시키는 핸드오버 프로토콜을 제안한다. 제안된 핸드 오버 프로토콜은 Previous Access Router(PAR)가 Binding Update(BU) 메시지를 전송하게 함으로써 PAR에서 New Access Router(NAR)로 포워딩되는 패킷의 개수를 감소시킨다. 제안된 핸드오버는 NS-2(network simulation)에서 시뮬레이션 되었고, 멀티미디어 데이터 통신에 사용되는 UDP를 이용하였다.

• Journal of Korea Society of Industrial Information Systems
• /
• v.11 no.3
• /
• pp.47-58
• /
• 2006

Address Auto-configuration capability is one of important advantages of IPv6 protocol This function enables the IPv6 hosts to configure IPv6 networks automatically, while IPv6 routers still have to be configured manually. To solve this problem, we propose RACP(Router Auto-Configuration Protocol), a new address auto-configuration protocol which configures all routers of a small network consisting of several routers and sub-networks automatically. The RACP protocol can automatically create and deliver IPv6 prefixes and routing informations of all routers on the network by using the network's prefix assigned by ISP. The proposed RACP can be used to set up network automatically for a small IPv6 site such as a small office network, a home network without the assistance of network administrator.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.7 no.6
• /
• pp.1187-1193
• /
• 2003

The interest for IPv6, which is next generation IP, increases, while the difficulty for adopting it into IT industries also increases too. We also expect that Internet technologies develop on basis of All-IP networks, which include various heterogeneous networks. Therefore, it is necessary for network to support mobility and multicast capability to create applications with wide-variety. In this paper, we propose a new mobile multicasting protocol called Mobile IPv6 Multicast Protocol(MIMP). The proposed scheme satisfies no packet losses from roaming and optimal routing efficiency.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.36 no.11B
• /
• pp.1269-1276
• /
• 2011

In the Proxy Mobile IPv6 (PMIPv6), the data transmission performance may be degraded when the two communicating hosts are located within the same mobile domain, since all the data packet shall be delivered by way of Local Mobility Anchor (LMA). In this paper we propose an extensional scheme of PMIPv6 using binding query. In the proposed Query-based PMIPv6 (Q-PMIPv6) scheme, the Mobile Access Gateway (NAG) of Correspondent Node (CN) sends a binding query to LMA to obtain the Proxy Care-of-Address of Mobile Node (MN). Since then, CN and MN can communicate with each other by using an optimized data path. For comparison, we performed the numerical analysis and the ns-2 simulations for the proposed Q-PMIPv6 scheme and the existing PMIPv6 and PMIPv6 Localized Routing (PMIPv6-LR). From the results, we can see that the proposed scheme outperforms the existing PMIPv6 and PMIPv6-LR schemes in terms of the signaling control and data delivery costs.

• The Journal of the Korea Contents Association
• /
• v.4 no.4
• /
• pp.197-203
• /
• 2004

In mobile network, the maintenance o( host grouping or the multicast delivery tree for multicasting algorithm becomes a major issues. In this paper, we explore the issues of mobile Multicast scheme using Mobile-IPv6, and addresses case when a mobile host is a source as well as a recipient of a given multicast operation using MLD(Multicast Listener Discovery) scheme, and the proposed MLD-based multicasting protocol asks its HA(Home Agent) to stop forwarding multicast for group using tunneling. We examine and compare our model to existing approaches by proposed cost model, and observe an improved ferformacne.

• Proceedings of the Korea Society for Simulation Conference
• /
• 2003.06a
• /
• pp.61-66
• /
• 2003

Mobile IP has been designed only to maintain communication as they move form place to place, so it doesn't guarantee Quality of Service(QoS). QoS in mobile IP is important to provide multimedia and real-time applications services in mobile, and it is closely related to handoff delay. Therefore, handoff delay problem is actively studied to guarantee QoS as a main issue in mobile IP research area Next generation Mobile IPv6 resolve this problem somewhat, triangle problem for first packet and handoff delay still remain. In this paper, we suggest SNMP Information-based routing that adds keyword management method to Information-based routing in active network in order to resolve such a problem, and then suggest QoS controlled handoff based on SNMP Information-Based routing. After modeling of suggested method and existing handoff method simulations we carried out with NS-2 for performance evaluation. The results of simulations show the some improvement on handoff delay, and therefore on QoS improvement.

• Proceedings of the KIEE Conference
• /
• 2003.11b
• /
• pp.163-166
• /
• 2003

In recent years, there has been increased to access multimedia service through the Internet due to rise of the access speed. We suppose the co-existence of the various access networks in adjacent area in the future, such as wireless LAN, Bluetooth, and 3G Cellular So, the size of the cell will be smaller and the number of access point will be increased. In other words, the potable devices need the efficient mobility scheme due to move between cells frequently Currently, the several of the scheme, which is Cellular IP, HAWAII, Mobile IPv4 regional registration, and hierarchical Mobile IPv6, is suggested to support micro-mobility but Mobile IPv4 is standard scheme to support the mobility of the mobile node. MPLS, which forwards the packet through switching instead of routing using IP address, has begun to deploy in the internet backbone to increase the performance of mobility protocol. The integration of both MPLS and Mobile IP improves the scalability of the Mobile IP data forwarding process by leveraging on the features MPLS which are fast switching and high scalability. Moreover it abbreviates IP-in-IP tunneling between HA and FA. In this paper, we suggest efficient mobility scheme through integration of both MPLS and hierarchical Mobile IPv6.