• Title/Summary/Keyword: lossless handoff

Search Result 3, Processing Time 0.014 seconds

A Lossless Multicast Handoff Method for Wireless ATM Networks (무선 ATM 망을 위한 손실없는 멀티캐스트 핸드오프 기법)

  • 하은용
    • The KIPS Transactions:PartC
    • /
    • v.8C no.1
    • /
    • pp.88-96
    • /
    • 2001
  • Future mobile communication networks, which consist of ATM-based B-ISDN backbone networks and wireless ATM networks, will provide u user with broadband connection and QoS service. These network systems need the lossless handoff methods which support user mobility, satisfy ATM features such as ATM cell ordering and no ATM cell duplication and minimize buffer requirement for ATM cell buffering. In this paper we suggest a multicast-based handoff method to supp$\alpha$t lossless connection as well as to minimize buffer overhead. It establishes a dynamic multicast connection between source terminal and wireless member AP (access point)s. When the mobile terminal receives data packet correctly, it notifies the positive acknowledgement of the packet to all member APs. And member APs then release the MT related temporary buffer space for MT's future movement. Therefore member APs can eliminate unnecessary buffer usage and manage the buffer space efficiently. Analysis result shows that our handoff method has better performance in buffer requirement for lossless and seamless connection services over VCT (virtual connection tree) method and other dynamic multicast-based handoff methods.

  • PDF

An Enhanced Handoff Mechanism for Cellular IP (Cellular IP 핸드오프 성능개선)

  • Kim, Gyeong-A;Kim, Jong-Gwon;Park, Jae-Yun
    • The KIPS Transactions:PartC
    • /
    • v.9C no.1
    • /
    • pp.89-96
    • /
    • 2002
  • Handoff is one of the most important factors that ma? degrade the performance of TCP connections in wireless data networks. In this paper, we present a lossless and duplication free handoff scheme called LPM (Last Packet Marking) for improving Cellular If semisoft handoff. LPM signals the safe handoff cue by sending a specially marked packet to mobile hosts. SPM (Semisoft rePly Message) is the only newly introduced control packet. Our performance study shows that LPM achieves lossless packet delivery without duplication and increases TCP throughput significantly.

A Low Latency Handoff Scheme with Lossless Remote Subscription for Real-time Multimedia Communications in Mobile IP Environments (모바일 IP환경에서의 실시간 멀티미디어 통신을 위한 무손실 원격지 가입 저 지연 핸드오프)

  • Kim Ho-cheal;Kim Young-tak
    • Journal of KIISE:Information Networking
    • /
    • v.31 no.6
    • /
    • pp.620-632
    • /
    • 2004
  • IP is not suitable for mobile nodes by network-based routing because mobile nodes are dynamically change their network attachment point. Mobile-IP is an IETF standard providing continuous access to the Internet for mobile nodes, but it has the triangle routing problem. Also it has a performance degradation problem by massive packet loss during layer 3 handoff of mobile nodes. Especially, two IETF multicast support schemes for Mobile-IP do not guarantee the quality of realtime multimedia services because they have several problems such as long routing path, packet duplication(hi-directional tunneling) and massive packet loss(remote subscription). In this paper, we propose a lossless remote subscription scheme that guarantees the quality of realtime multimedia services over Mobile-IP. From the result of simulation, we verified that the proposed scheme in this paper can reduce the delay time of remote subscription by the effect of the low latency handoff scheme that is extended to apply to the multicast group management and it requires only 0.58% buffer spaces of the previously proposed lossless remote subscription scheme.