• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.6B
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• pp.349-354
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• 2005

Several IP autoconfiguration techniques for MANET have been proposed by this time. But most of them concentrate on dealing with address duplication, so they have problems with latency and inefficient address space utilization. In this paper, we proposed a new IP autoconfiguration technique, namely Relational MANET Autoconfiguration Protocol(RMAP). This technique distributes IP addresses effectively by exchanging messages and recovers IP addresses by applying parent-child relationship. Simulation experiments are conducted to demonstrate the enhancement of the proposed algorithm over other known algorithms regarding latency, uniform distribution, and IP address recovery ratio.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.205-207
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• 2001

3세대 이동 통신망인 UMTS/GPRS에서 IP 기반의 서비스를 제공하기 위해서는 이동단말이 IP 주소를 할당 받고 이 주소를 통하여 데이터 패킷이 전송된다. 하지만 IPv4에서 인터넷 가입자의 폭발적인 증가로 인해 IP 주소 부족 문제를 예견하고 있다. UMTS/GPRS에 IP 주소가 획기적으로 증가하는 IPv6(Internet Protocol version 6) 적용이 필요하다. 본 논문에서는 UMTS/GPRS 망에서의 stateless autoconfiguration 절차를 설명하고 이동단말이 DHCPv6 서버와 연동하여 IP 주소를 할당하기 위한 stateful autoconfiguration 방법을 제안한다.

• ETRI Journal
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• v.28 no.2
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• pp.243-246
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• 2006

In a mobile ad hoc network, difficulties exist in supporting address autoconfiguration and naming resolution due to the lack of centralized servers. This letter presents a novel approach, called name-based autoconfiguration (NBA), which uses host names to determine IP addresses and provides address autoconfiguration and name resolution as a single protocol.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.97-100
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• 2001

For the auto-configuration of diverse hosts and automation of network management as many electronic machines and industrial components are becoming connected to Internet, it is possible to use autoconfiguration using DHCP and network management protocol such as SNMP, CMIP. But these technologies are not developed maturely and lack various standardizations yet because these are designed for restrictive purposes in the past. The new working group "Zeroconf" is made in IETF at March, 2000, it is aimed for making standards of autoconfiguration which is applied to impromptu ad-hoc networks in automobiles, trains, planes and home network or mobile networks. In this paper, we introduce the IPv6 based autoconfiguration technologies such as IP interface configuration, translation between host name and IP address, IP multicast address allocation and service discovery. Finally, trends of standardization in Zeroconf working group will be shown. be shown.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.1067-1070
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• 2005

In this paper, we propose the address allocation algorithm in hybrid Mobile ad-hoc network (MANET). Most of proposed address autoconfiguration algorithms are node based. Node based address autoconfiguration algorithms are inefficient. Because the node based algorithms waste bandwidth and consume much battery in mobile ad-hoc networks. we present the address allocation algorithm using internet gateway based address autoconfiguration by modifing the IPv6 stateless address autoconfiguration protocol. We use the network simulator NS-2 in our experiments. The simulation result shows reducing network traffic and saving battery.

• Journal of KIISE:Information Networking
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• v.35 no.4
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• pp.282-291
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• 2008

This paper focuses on message complexity performance analysis of MANET AAPs in reference to link errors generated by the mobile wireless nodes. To obtain the message complexity performance of AAPs in reference to the link error probability ($P_e$), an enhancement was made by proposing the retransmission limit (S) to be computed for error recovery (based on the link error probability), and then for each of the AAPs the control procedures for the retransmission limit have been properly included. The O-notation has been applied in analyzing the upper bound of the number of messages generated by a MANET group of N nodes. Based on a link error probability range of $P_e=0$ to 0.8, the AAPs investigated in this paper are Strong DAD, Weak DAD with proactive routing protocol (WDP), Weak DAD with on-demand routing protocol (WDO), and MANETconf. Based on the simulation results and analysis of the message complexity, for nominal situations, the message complexity of WDP was lowest, closely followed by WDO. The message complexity of MANETconf is higher than that of WDO, and Strong DAD results to be most complex among the four AAPs.

• Journal of Communications and Networks
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• v.11 no.3
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• pp.248-260
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• 2009

To connect a mobile ad hoc network (MANET) with an IP network and to carryout communication, ad hoc network node needs to be configured with unique IP adress. Dynamic host configuration protocol (DHCP) server autoconfigure nodes in wired networks. However, this cannot be applied to ad hoc network without introducing some changes in auto configuration mechanism, due to intrinsic properties (i.e., multi-hop, dynamic, and distributed nature) of the network. In this paper, we propose a scalable autoconfiguration scheme for MANETs with hierarchical topology consisting of leader and member nodes, by considering the global Internet connectivity with minimum overhead. In our proposed scheme, a joining node selects one of the pre-configured nodes for its duplicate address detection (DAD) operation. We reduce overhead and make our scheme scalable by eliminating the broadcast of DAD messages in the network. We also propose the group leader election algorithm, which takes into account the resources, density, and position information of a node to select a new leader. Our simulation results show that our proposed scheme is effective to reduce the overhead and is scalable. Also, it is shown that the proposed scheme provides an efficient method to heal the network after partitioning and merging by enhancing the role of bordering nodes in the group.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.1545-1549
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• 2005

According as computer is supplied in a lot of homes and offices and Internet use increases, various service based on the Internet. Including wireless PDA in the future, many devices such as Internet telephone, TV, refrigerator and oven will be connected on the Internet and Internet address exhaustion will be raised to serious problem gradually. Today, the IPv4 address exhaustion problem has been solved partially using NAT (Network Address Translation) however, the transition to next Generation Internet will be accelerated because of advantages such as mobility, security service, QoS, and abundant IP addresses. In IPv6, all hosts are designed to create and set their address automatically without manager's intervention using Neighbor Discovery Protocol. But, when an IPv6 host sets its address automatically, there are serious security vulnerabilities. In this paper, we analysis security vulnerabilities in auto-configuration and provide security requirements for secure auto-configuration.

• Journal of KIISE:Information Networking
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• v.31 no.6
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• pp.659-672
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• 2004

A Mobile Ad hoc Network (MANET) is a group of independent mobile computing nodes that consist of a multi-hop wireless network without a central administration or any infrastructure. Every node that wants to join a MANET must obtain an address for communication. Having a centralized DHCP server that provides addresses to nodes, we can easily and automatically obtain addresses. However, a MANET lacks any fixed infrastructure such as a DHCP server. We therefore propose a distributed address autoconfiguration approach for a MANET using a reserved address and optimistic Duplicated Address Detection (DAD). The reserved address helps to reduce the allocation latency, and the optimistic DAD guarantees the uniqueness of addresses and lessens communication overhead. We then suggest methods of handling network partition and network merging situations, and go on to evaluate our approach through simulations. The simulation result shows that our scheme guarantees the uniqueness of allocated address and considerably improves allocation latency and communication overheads.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1241-1244
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• 2003

이동 Ad Hoc 네트워크는 사전에 계획되지 않은, 필요에 의해서 발생하는 단일 혹은 멀티 홉 무선 네트워크이다. 기간망 구조를 활용하지 않는 이동 Ad Hoc 네트워크에서는 네트워크를 구성하는 이동 단말들에게 라우팅 기능이 전가되며, 이동 단말의 움직임에 따라 동적으로 네트워크 토폴로지가 변경되는 특성을 갖게 된다. 현재 제안되고 있는 이동 Ad Hoc 네트워크의 라우팅 프로토콜들은 기본적으로 이동 Ad Hoc 네트워크의 목성을 고려하여 설계되었으며, 각기 효율적인 라우팅 알고리즘을 제안하여 이동 Ad Hoc 네트워크상에서 발생할 수 있는 제어 패킷 부담, 전력 소모 부담 등을 최소화 하기 위한 연구를 하고 있다. 또한 Ad hoc 네트워크 사용자들이 쉽게 이동단말을 이용할 수 있도록 이동단말의 주소 설정을 IPv6의 주소 자동설정을 이용하는 무설정 기법이 제안되고 있다. 본 논문에서는 Ad hoc 네트워크의 특징 및 응용과 현재까지 제안되어 온 멀티캐스트 라우팅 프로토콜의 특징을 분석하고 IP 네트워크에 필수적인 자동화 기술의 개념은 개발현황을 소개한 후 향후 연구 방향을 제시하였다.