• Title/Summary/Keyword: Handover scheme

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Fast and Secure Handoff Mechanism for Mobile IPv6 based on IEEE 802.11 (IEEE 802.11 기반의 고속의 안전한 Mobile IPv6 핸드오프 메커니즘)

  • Kang, Hyun-Sun;Park, Chang-Seop
    • Journal of Korea Multimedia Society
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    • v.13 no.2
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    • pp.205-215
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    • 2010
  • It is necessary to provide a fast and secure handover for seamless real-time multimedia services based on IEEE 802.11. In this paper, we propose FMIPv6 handoff protocol integrating L2/L3 layer based on IEEE 802.11 WLAN environment. In that, we propose a hierarchical key management scheme and authentication mechanism for protecting the handover signaling messages. The number of connections with AAA server is minimized for the fast handover. It is also compared and analyzed the handover cost with previous method.

Speed-Sensitive Handover Scheme over IEEE 802.16 Multi-Relay Networks

  • Kim, Dong-Ho;Kim, Soon-Seok;Lee, Yong-Hee
    • Journal of Information Processing Systems
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    • v.6 no.3
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    • pp.403-412
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    • 2010
  • Multi-Relay Networks should accommodate mobile users of various speeds. The cellular system should meet the minimum residency time requirements for handover calls while considering an efficient use of available channels. In this paper, we design speed-sensitive handover under dynamic hierarchical cellular systems, in which mobile users are classified according to the mean speed of mobile users and each class has its cellular layer. In order to meet the minimum residency time, the cell size of each cellular layer is dynamically determined depending on the distributions of mean speeds of mobile users. Since the speed-dependent non-preferred cell can provide a secondary resource, overflow and take-back schemes are adopted in the system. We develop analytical models to study the performance of the proposed system, and show that the optimal cell size improves the blocking probability.

Fast Mobility Management Using Multi-casting Tunneling in Vehicular Networks (차량 네트워크에서 멀티 캐스팅 터널링을 이용한 고속 이동성 관리 방법)

  • Chun, Seung-Man;Nah, Jae-Wook;Park, Jong-Tae
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.11C
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    • pp.877-884
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    • 2010
  • This paper presents a fast IP mobility management scheme in vehicular networks where multiple wireless network interfaces are used to perform the fast handover without packet loss and handover latency. In order to do that, the IETF standard HMIPv6 has been extended, where multiple simultaneous tunnels between the HMIPv6 MAP and the mobile gateway are dynamically constructed. The architecture for supporting multiple tunnels has been designed and both mathematical analysis and simulation using NS-2 have been done for performance evaluation.

Handover Scheme Considering for Signaling Time in Mobile Networks (무선 네트워크 망에서 시그널링 시간을 고려한 핸드오버 기법)

  • 김도연;한정안;김병기;박상준;김관중
    • Journal of the Korea Society for Simulation
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    • v.11 no.1
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    • pp.45-58
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    • 2002
  • In the wireless communication systems of the next generation, the hard handover may frequent]y occur between the existing 2G(2nd generation) and the 3(1(3rd generation). When it occurs between the 2G and the 3G, the call setup procedure will be added to MT(Mobile Terminal), the relay bases in 2G and 3G, and the switches. It causes total time to handle the hangover to increase. Therefore, the forced termination probability may be increased since relative time decreases. In this paper, we propose a method to decrease the forced termination. The method execute the handover procedure with speed and direction of the MT preestimated in the inner cell when MT enters the boundary cell.

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3S: Scalable, Secure and Seamless Inter-Domain Mobility Management Scheme in Proxy Mobile IPv6 Networks (프록시 모바일 IPv6 네트워크에서 3S를 고려한 도메인간 이동성관리 기법)

  • Kang, Min;Jeong, Jong-Pil
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.12 no.3
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    • pp.99-114
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    • 2012
  • Proxy Mobile IPv6 (PMIPv6) has received considerable attention between telecommunications and the Internet communities and does not require active participation of the Mobile Node (MN) by way of network-based mobility management. The PMIPv6 domain is studying establishment in progress to support extensively a number of MN by using a low handover latency. In this research, we are propose a novel 3S scheme for building Scalable and Secure and Seamless PMIPv6 domains. In the proposed scheme, all of Mobility Access Gateway (MAG) are acting as the Local Mobility Anchor (LMA) and composing a virtual ring with another MAG. General hashing is used in the efficient distribution-mapping between each MN and the MN's LMA of all MAGs. And, MAG and MN are authenticated using the symmetric key. Through mathematical analysis, we verifies the safety, scalability, and seamless service for 3S. Also, we're propose a handover procedure of 3S and show better than the existing schemes in terms of handover latency.

NEMO Support Scheme within PMIPv6 for Supporting Network Mobility in Harbor Area (항만 내 네트워크의 이동성 지원을 위한 PMIPv6망의 NEMO 지원 기법)

  • Min, Sang-Won;Han, Kyeong-Il;Jeong, Min-A;Lee, Seong Ro
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.8
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    • pp.674-680
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    • 2014
  • In this paper, as one of the fusion of IT and ocean technology, we propose a scheme to support NEMO in a harbor area network to provide network mobility for passengers, distribution as well as give a connection to an MN from an outside network. In a harbor area under PMIPv6 with NEMO support, a problem could be occurred due to overlapping HA/LMA tunnels and duplicate BCE fields. To Solve these problems, we consider the existing mobility option and add an optional field in the PBU message, which can notify the LMA and HA for either an initial connection or handover request. This procedure can reduce some overlapped steps of binding procedure. Hence, our proposed scheme could reduce an amount of delay and save the processing resource in the harbor area under PMIPv6 with NEMO support.

A Novel Sender-Based TCP Congestion Control for Downward Vertical Handover (하향 수직 핸드오버 상황에서 송신자에 기반을 둔 TCP 혼잡 제어 기법)

  • Choi, Yeo-Min;Song, Joo-Seok
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.6B
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    • pp.430-439
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    • 2008
  • In this paper, we propose a sender-based TCP congestion control scheme for downward vertical handover (DVHO), in which mobile node moves from a cellular network to a wireless LAN. DVHO can give rise to severe performance problems in TCP throughput because it causes a drastic change of link characteristics. Particularly, TCP executes falsely congestion control by packet reordering, which is occurred from link delay difference between a cellular link and a wireless LAN link. Therefore, the congestion window is reduced. And unnecessary retransmissions wastes bandwidth. To solve these problems, we propose a method using estimated round-trip time in cellular link to process duplicated ACKs from reordering. Furthermore, the duplicated ACKs are used to the control congestion window size. Simulation result shows that the proposed scheme can solve problems. Moreover, the proposed scheme can have better performance than TCP New Reno and nodupack.

An IPv6 based Fast Handover Deployment Scheme for WiBro Networks (광대역 무선 인터넷 망에서 IPv6 기반의 고속 핸드오버 도입을 위한 방안)

  • Shim, Min-Sik;Kim, Hwa-Sung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.11A
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    • pp.1101-1112
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    • 2006
  • With the recent growth in demand for high-data rate multimedia services in the wireless environments, the Mobile Broadband Wireless Access (MBWA) technologies, such as WiBro (Wireless Broadband internet) system, are gradually coming into the spotlight. Unlike the conventional mobile communication networks based on cellular system, the WiBro system basically consists of IP based backbone networks that will be ultimately deployed by Ipv6 (IP version six) based backbone networks according to the All-IP trend for the network evolution. In such wireless mobile environments, it is needed to support the mobility management protocol on network layer as well as physical layer and Medium Access Control (MAC) layer in WiBro system. Accordingly, in this paper, we propose a fast handover scheme for improving the handover performance in IPv6 based WiBro system and show that the proposed scheme achieves loss-free and low handover latency during inter-subnet movement of the mobile stations through the simulation.

A Handover Method Based on the Position Information of a Mobile Terminal (이동 단말기의 위치 정보를 이용한 핸드오버 방법)

  • 이종찬;박상준
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.11
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    • pp.57-66
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    • 2004
  • It is widely accepted that the coverage with high user densities in mobile multimedia environments can only be achieved with small cell such as micro- and pico-cell. The smaller cell size causes frequent handovers between cells and a decrease in the permissible handover processing delay. This may result in the handover failure, in addition to the loss of some packets during the handover. In these cases, re-transmission is needed in order to compensate errors, which triggers a rapid degradation of throughput. In this paper, we propose a new handover scheme in the next generation mobile communication systems, in which the handover setup process is done in advance before a handover request by predicting the handover cell based on mobile terminal's current position and moving direction. Simulation is focused on the handover failure rate and packet loss rate. The simulation results show that our proposed method provides a better performance than the conventional method.

Fault Tolerant Channel Allocation Scheme considering Multimedia Service in IMT-2000 (차세대 이동망에서 멀티미디어 서비스를 고려한 FTC 방식)

  • 박상준;이효준;조인숙;김관중;김병기
    • Journal of the Korea Society for Simulation
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    • v.10 no.4
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    • pp.11-20
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    • 2001
  • In the IMT-2000 networks, the model of micro/pico cell is suggested for transmission of multimedia service. Hence, the efficient method is required for processing of mobile calls in micro/pico cell. In the central urban area, mobile calls may be dynamically increased because of many mobile users. And microcel]/picocell size has small size, handover calls will be more increased. Therefore, many of mobile calls is occurred at a cell in the central urban area, so channel requests for these calls will be increased in the call. In this paper, we propose a scheme, FTC(Fault Tolerant Channel allocation) which is the channel management method for hard handover and new call in a mobile cell of central urban area. When available channels in the cell are consumed, the FTC investigates channel states of neighbor cells in the RNC(Radio Network Controller) or BSC (Base Station Center), and provide available channel for mobile call. The ]no scheme is analyzed and compared with existing channel management method by simulation.

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