• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.11
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• pp.44-52
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• 2011

In this article, we present a QoS-guaranteed IP mobility management scheme of Internet service for fast moving vehicles with multiple wireless network interfaces. The idea of the proposed mechanism consists of two things. One is that new wireless connections are established to available wireless channels whenever the measured data rate at the vehicle equipped with mobile gateway drops below to the required data rate of the user requirement. The other is that parallel distribution packet tunnels between an access router and the mobile gateway are dynamically constructed using multiple wireless network interfaces in order to guarantee the required data rate during the mobile gateway's movement. By doing these methods, the required data rate of the mobile gateway can be preserved while eliminating the possible delay and packet loss during handover operation, thus resulting in the guaranteed QoS. The architecture of the IETF standard HMIPv6 has been extended to realize the proposed scheme, and detailed algorithms for the extension of HMIPv6 has been designed. Finally, simulation has been done for performance evaluation, and the simulation results show that the proposed mechanism demonstrates guaranteed QoS during the handover with regard to the handover delay, packet loss and throughput.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.8
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• pp.1391-1400
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• 2008

In recent yeats, SCTP is known as the next transport layer protocol for connection-oriented and reliable data transfer after TCP/UDP. The SCTP was developed on the basis of the existing TCP and was designed to eliminate defects of TCP. SCTP has the different characteristic of multi-streaming and multi-homing from TCP. In this paper, we studied the defects of the performance of communication using the traits of multi-homing. And we evaluated the efficiency for each application services on the basis of SCTP of IPv6. Also, we analysed the delay time of a packet using SCTP and TCP. We noticed that the efficiency of SCTP is better than that of TCP.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.1
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• pp.65-73
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• 2004

In this paper, we propose a tunnel establishment scheme using Next Hop Resolution Protocol over mobile IP networks, which consist of LAN-based IP networks and ATM-based IP networks. As a basic idea, we use the shortest path algorithm to establish a short-cut tunnel between HA and FA. Also, we classify methods for establishing a short-cut tunnel into four cases considering the locations of HA, FA, CN and MN. To confirm the advantages of our schemes, which deliver packets using short-cut tunnel in optimized path method over mobile IP networks, we performed mathematical analysis and simulation, compared proposed schemes with existing IP routing method in terms of transmission delay between CN and MN. The simulation results show that our scheme have superior performance to that of existing IP routing mechanism, because the store-and-forward delay which occurred in IP routing mechanism is considerably reduced in short-cut tunnel over ATM networks.

• Annual Conference of KIPS
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• 2008.11a
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• pp.1300-1302
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• 2008

최근 위성을 통한 위치정보서비스를 이용하여 응용서비스를 제공하려는 움직임이 늘고 있다. 이처럼 위치기반서비스(LBS: Location Based Service)를 제공하려는 현재의 추세를 볼 때에 단말에 위치기반을 위한 기능은 필수적인 추가사항이며 이를 위한 단말의 부담은 고려해야 할 사항이다. 그러나 A-GPS(Assisted GPS) 기술 중 A-GPS Server(Assistance GPS Server)을 이용함으로써 단말에 부담을 적게 하면서 위치기반의 서비스를 제공받을 수 있고, 핸드오버 지연을 효과적으로 줄일 수 있다면 1 석 2 조의 효과를 얻을 수 있게 된다. 본 논문에서는 기존 PMIPv6(Proxy Mobile IPv6) 메커니즘에 A-GPS Server 를 두어서 효과적인 핸드오버 수행과정을 거치고, 위치기반서비스(LBS)를 제공하는 메커니즘을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.7B
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• pp.760-770
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• 2011

The existing mobility management schemes do not fully support the next generation network, which is composed of IP-based core network and various access networks. Currently, ETRI has been developing the AIMS (Access Independent Mobility Service) system which satisfies the ITU-T requirements of mobility management in the next generation network. The AIMS system is designed to provide a mobile host with a fast and reliable mobility service among heterogeneous access networks. Recently, many user devices have multiple communication interfaces, e.g., 3G and WLAN, and thus they can make two or more network connections at the same time. In this paper, we design a scheme of flow mobility, i.e., the movement of selected data flows from one access technology to another, to be applied in the AIMS system, and verify the proposed scheme through the NS-3 simulation study. From the simulation results, we can know that the proposed flow mobility scheme can utilize the network resource efficiently in the heterogeneous mobile networks.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10d
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• pp.205-209
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• 2007

한 접속망 (Access Network) 내에서 이동 노드의 이동성을 지원하는 협역 이동성에 대한 많은 연구가 진행되었다. 최근, 이동 노드에 이동성 프로토콜 스택의 탑재 없이도 협역 이동성을 지원하는 연구 즉, 이동 노드에 투영한 협역 이동성 연구인 Proxy Mobile IPv6 (PMIPv6)가 IETF NetLMM WG에서 표준화가 진행되고 있다. 현재 3GPP, WiMAX 등의 이동통신 표준화 단체들은 PMIPv6를 이동통신 접속망을 위한 표준 이동성으로 채택하고 있다. 즉, 이러한 차세대 이동망 구조를 채택하는 통신 사업자들은 PMIPv6의 이동성을 채택할 것이다. 따라서, 이러한 이동통신 사업자들간의 이동성인 로밍도 PMIPv6를 그 골간으로 하게 될 것이다. 향후 이동통신 시장은 다양한 이동통신 사업자들이 자유롭게 경쟁하는 구조를 가질 것이며, 이들간 로밍이 빈번하게 이루어질 것으로 예상된다. 하지만, 현재 PMIPv6간의 이동성인 로밍은 구체적인 표준화 과정이 진행되고 있지 않으며, 광역 이동성을 위한 MIPv6 채택을 고려하고 있다 즉, 로밍을 하기 위해서는 PMIPv6로의 이동임에도 탈구하고 이동 노드에 MIPv6 스택을 요구한다. 본 논문에서는 PMIPv6를 채택하는 이동 사업자들간의 이동성인 로밍의 경우 이동 노드에 특별한 이동성 프로토콜 스택을 탑재하지 않은 이동 노드에 투명한 로밍 방안을 제시한다.

• The KIPS Transactions:PartC
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• v.12C no.6 s.102
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• pp.917-926
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• 2005

In this paper, we propose a transport layer mobility support protocol for multimedia streaming services in mobile/wireless environments by extending PR-SCTP to support mobility. We named the proposed scheme to be uPR-mSCTP. The rules related to provide unordered and unreliable data transfer, as well as an approach to minimize handover latency we proposed. Through the simulation results, it is shown that, since uPR-mSCTP reduces transmission rates during handover, not only it reduces the waste of network resources, but it also has the packet loss rate similar to FMIPv6, which is a lot smaller than UDP over MIPv6 or HMIPv6 It also incurs smaller control packet overhead compared to the network layer mobility support approaches.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.5B
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• pp.243-252
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• 2008

In this paper, we propose the next-generation broadband wireless access network architecture, which is based on the wavelength division multiplexing-passive optical network(WDM-PON), and efficient mobility management scheme to support quality-of-service(QoS) of multimedia services in the next-generation wireless network. By adapting WDM-PON technology to wireless access network, the proposed scheme can realize broadband wireless access network. In addition, We utilize newly proposed local channels between optical network units(ONUs) or subnets in order to support the fast and efficient local data and handoff data transmission. We evaluate the performance of the proposed scheme in terms of handoff delay and packet loss thru computer simulation. Thru various computer simulation results, we verified the superior performance of the proposed scheme by comparing with the results of other schemes.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.1
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• pp.22-30
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• 2008

Warehouse has many changes for the stocks by entering and taking. Management about the stocks is important. To manage, sensor network based on RFID is deployed in warehouse. Sensor network uses fluster based on energy and hierarchical routing. Supporting mobility between clusters makes guarantee connectivity for mobile nodes.

• Journal of Communications and Networks
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• v.7 no.2
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• pp.178-191
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• 2005

Fourth-generation (4G) wireless networks will be the IP-based cellular networks integrating Internet with the existing cellular networks. Two important issues should be concerned in the IP-based cellular networks, IP mobility, and quality-of-service (QoS) guarantees. In this paper, we proposed two mechanisms to solve the problems with IP mobility and RSVP-based QoS provisioning. First, virtual-IP (VIP) allocation scheme in areas with a large rate of handoff can minimize the wireless signaling overhead due to IP mobility. The access routers (ARs) create dynamically the VIP zone by using the measured handoff rate derived from the history of the handoff into neighboring ARs. We show that VIP allocation scheme reduces the binding update messages in the wireless link than hierarchical mobile IPv6. Second, the new advance resource reservation protocol called proportional aggregate RSVP (PA-RSVP) can minimize waste of bandwidth and soft state refresh overhead due to IP mobility. It allocates the bandwidth in advance between the mobility anchor point and neighboring ARs using proportional aggregate reservation. We also show that PA-RSVP provides an improved performance over existing protocols.