• Title/Summary/Keyword: Mobile Router

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Improvement of Handoff-state and QOS in Wireless Environment

  • Jeong, You-Sun;Choe, U-Gin
    • Journal of information and communication convergence engineering
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    • v.8 no.1
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    • pp.1-5
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    • 2010
  • In this paper, we propose for improving QoS in wireless micro cellular network using Cellular-IP/PRC(Paging Route Cache) with Paging Cache and Route Cache in Cellular-IP and propose for performance of realtime and non-real time handoff service using Handoff state machine Paging Route Cache. Although the Cellular-IP/PRC technology is devised for mobile internet communication, it bas its vulnerability in frequent handoff environment. On the other hand, Cellular IP combines the capability of cellular networks to provide high performance handoff and efficient location management of active and idle mobile users with the inherent flexibility, robustness and scalability found in IP networks. Also Cellular-IP/PRC use semi-soft handoff. During semi-soft hand off a mobile host may be in contact with either of the old and new base stations and receive packets from them. Packets intended to the mobile node are sent to both base stations and buffered, so when the mobile host eventually moves to the new location it can continue to receive packets without interruption. It should be suitable for realtime service such as multimedia traffic. But, much waste of resource will occur in this method, especially for non-real time services such as FTP and E-mail. Therefore, a new algorithm that performs different handoff according to characteristic of each traffic by use of reserved field in IP packet is proposed in this thesis. This hand off state machine using differentiated handoff improves quality of services in Cellular-IP/PRC. Suggested algorithm shows better performance than existing technology in wireless mobile internet communication environment. Matlab simulation results are improving QoS, show call drop and call blocking provided to Paging Router Cache during handoff state machine in Cellular-IP/PRC.

A Novel Global Mobility Management Scheme for Multicasting Service Support in Proxy Mobile IPv6 Networks (프록시 모바일 IPv6 네트워크에서 멀티캐스팅 서비스 지원을 위한 글로벌 이동성관리 기법)

  • Park, Jongsun;Kim, Jongyoun;Jeong, Jongpil
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.12 no.6
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    • pp.229-240
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    • 2012
  • The development of multimedia applications followed by development of high-speed networks has improved the performance of mobile devices with high transfer speed broadband. Mobile internet access has made possible seamless indoor and outdoor mobile multicast services. Multicasting services are used to support efficient group communications. However, mobile multicasting services have two constraints: tunnel convergence and handover latency. Many protocols and handover methods have been proposed to address these problems. The inter-LMA optimized handover model for multicasting services has previously been proposed for PMIPv6-based networks. The proposed model removes the tunnel convergence issue and reduces router processing costs. It also makes possible the performance of fast handover operations with adaptive transmission mechanisms. In addition, the proposed scheme exhibits low packet delivery costs and handover latency in comparison with existing schemes, and ensures fast handover when moving the inter-LMA domain

Network based MPLS VPN using BGP-E for Mobility Support (이동서비스를 지원하는 BGP-E 방식 MPLS VPN의 설계 및 구현)

  • Lee, Young-Seok;Lim, Hyoung-Taek;Choi, Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.10B
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    • pp.927-937
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    • 2003
  • Network based VPN(Virtual Private Network) using MPLS(Multiprotocol Label Switching) technology is regarded as a good solution for intranets or extranets because of the low cost and the flexibility of the service provision. In this paper, we describea mechanism that allows the VPN users to move from one site to another site of the VPN network based on the BGP-E MPLS technology. This mechanism is designed for and implemented on PE(Provider Edge) routers of the backbone network. PE routers connected to the VPN sites establish a new MPLS path to the mobile node after they detect movement of the mobile VPN node. The new location may belong to the same VPN or to different VPN. We designed VPN management and control functions of the PE routers in order to interface with the Mobile IP protocol. The pilot implementation and performance measurement were carried out on a testbed.

An Efficient Multicast Architecture for IP-Based Mobile Core Networks (IP기반 모바일 코어 네트워크에서의 효율적인 멀티캐스트 아키텍처)

  • Kim Won-Tea;Kim Hyo-Eun;Park Yong-Jin
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.6 s.348
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    • pp.9-22
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    • 2006
  • When the legacy multicast routing protocols are adopted in If-based mobile core networks, there are some problems such as traffic injection from unnecessary sources, traffic overhead by group management and router performance degradation by large amount of multicast session information. In this paper, we propose a stateless multicast mechanism which has no need to maintain multicast information for session status and reduces redundant network overhead for maintaining multicast tree. In addition interworking with IGMPv3 gets rid of traffic from unnecessary sources which have no registration from receivers. The operations of essential components including a gateway node for interworking with the legacy Internet multicast network, a gateway node for transparency to radio access network and a intermediate node in mobile core networks, are definitely defined and the proposed communication architecture is completed. Finally we evaluate and approve the performance of the proposed architecture by means of well-designed network simulation.

A Routing Protocol for Network Lifetime Extension in MANET (MANET에서 네트워크 수명 연장을 위한 라우팅 프로토콜)

  • Kim, Kyoung-Ja;Han, Sang-Hoon;Koo, Hyun-Woo
    • The Journal of the Korea Contents Association
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    • v.10 no.2
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    • pp.120-129
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    • 2010
  • MANET(Mobile Ad Hoc NETwork) is a collection of mobile nodes that are free to move and organize themselves in an arbitrary manner without any fixed infrastructures. These mobile nodes are connected by wireless links and act as routers for all other nodes in the network. As a router each node in MANET consumes its batteries when forwarding a message, and the selection of the best path to minimize the total power needed to route packets is needed to maximize the lifetime of all nodes. In this paper, we propose a routing protocol considering the remaining battery capacity of nodes in the routing paths. The proposed scheme prevents the battery of each node from being overused and increases the lifetime of the network.

User Centric Cache Allocation Schemes in Infrastructure Wireless Mesh Networks (인프라스트럭처 무선 메쉬 네트워크에서 사용자 중심 캐싱 할당 기법)

  • Jeon, Seung Hyun
    • Journal of Industrial Convergence
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    • v.17 no.4
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    • pp.131-137
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    • 2019
  • In infrastructure wireless mesh networks (WMNs), in order to improve mobile users' satisfaction for the given cache hit ratio, we investigate an User centric Cache Allocation (UCA) scheme while reducing cache cost in a mesh router (MR) and expected transmission time (ETT) for content search in cache. To minimize ETT values of mobile users, a genetic algorithm based UCA (GA-UCA) scheme is provided. The goal is to maximize mobile users' satisfaction via our well defined utility, which considers content popularity and the number of mobile users. Finally, through solving optimization problem we show the optimal cache can be allocated for UCA and GA-UCA. Besides, a WMN provider can find the optimal number of mobile users for user centric cache allocation in infrastructure WMNs.

Perfomance Evaluation of efficent handover Latency Using MIH Services in MIPv4 (MIH를 이용한 효율적인 MIPv4망의 구성에 관한 연구)

  • Kim, Ki-Yong;Jang, Jong-Wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2007.10a
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    • pp.75-78
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    • 2007
  • Mobile IP provides hand-held devices with mobility which allows the user to do work over the network. However, handover time due transfer between access routers causes network delays and data loss. L2Trigger Handover expects this handover to take place, and executes L3 handover before L2 handover takes place, thereby reducing overall handover latency, although it still is an issue since handover latency between AR is not completely eliminated in L2 trigger handover. In this paper took into consideration where MIH is used in MIPv4 and using MIH Table when handover is about to occur in MN(Mobile Node), thereby pre-fetching data needed by Handover. In this way, when the handover is estimated, it improves the init time that L2trigger had. Furthermore we can find that we can execute the handover with shorten init time in smaller and narrow overlap length

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Distributed Binding Update Scheme for Fast Handoff in Non-Nested Network Mobility Environment (비 중첩 네트워크 이동성 환경에서 빠른 핸드오프를 위한 분산 바인딩 갱신 기법)

  • Kim, Hoon;Song, Ui-Sung
    • The Journal of Korean Association of Computer Education
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    • v.10 no.5
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    • pp.81-88
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    • 2007
  • To support the movement of a mobile network consisting of several mobile nodes, the IETF NEMO working group proposed NEMO basic support protocol using bi-directional tunneling between the home agent and the mobile router. Since NEMO basic support protocol is based on bi-directional tunneling, all communications to and from mobile nodes are suffer from inefficient routing all the cases. To solve the routing inefficiency problem, several proposals are proposed. However, those proposals results in new problems, such as binding update storm and changes in existing protocol. Especially, binding update storm problem may cause the delay in binding update, this subsequently causes the difficulty for a real time service and the handoff delay on the movement of mobile network. In this paper, we propose a new binding update scheme which reduces binding update latency and the handoff delay through the distribution of the transmission time of binding update messages. The performance of the proposed scheme is also evaluated to demonstrate its efficiency. Simulation results show that the proposed scheme can efficiently reduce the binding update latency.

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Handover Monitoring with Flow-based Traffic Measurement in Mobile IPv6 Routers (모바일 IPv6 라우터에서 플로우 측정을 이용한 핸드오버 모니터링)

  • Son, Hyeon-Gu;Choi, NaK-Jung;Choi, Yang-Hee;Lee, Young-Seok
    • Journal of KIISE:Information Networking
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    • v.36 no.5
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    • pp.397-404
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    • 2009
  • In this paper, we propose a method of monitoring traffic and analyzing information of handover in mobile IPv6 networks. Our proposed method analyzes handover latency through monitoring packets at routers without installing monitoring applications at mobilenodes. For this purpose, we employ a flow-based traffic monitoring standard called IPFIX to perform the traffic measurement function the packets at the routers. Therefore, our method is useful in that we could easily obtain information regarding handover of mobile nodes by only monitoring traffic at the routers. In order to verify the proposed method, we carried out experiments in a real 802.11-based mobile IPv6 network testbed. From our experimental results, it was shown that the calculated handover latency for uploading traffic is accurate with less accuracy of analyzing the handover latency for downloading traffic.

Route Optimization Using a Limited Prefix Delegation Method in Multi-level Nested Mobile Network Environments (다단 중첩된 이동네트워크 환경에서 제한된 프리픽스 위임 방법을 이용한 경로최적화)

  • Song, Jung-Wook;Han, Sun-Young
    • Journal of KIISE:Information Networking
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    • v.36 no.4
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    • pp.309-321
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    • 2009
  • Nowadays, requests of connecting to the Internet while moving are increasing more and more, and various technologies have been developed for satisfying those requests. The IETF nemo WG standardized "Network Mobility Basic Support Protocol" for supporting mobile network through extending existing MIPv6 protocol for supporting host mobility. But, mobile networks can be nested while they are changing their location. And if they are multi -level nested, that causes some problems because of protocol characteristic. In this paper, we try to solve the problem that is complicated routing path caused by multi-level nesting of mobile networks with our limited prefix delegation method. We give a little modification to the standard protocol and add some functions to mobile router. With results from analysis, we could say that our method has better performance than other proposed methods.