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SNC: a selective neighbor caching scheme for fast handoff in IEEE 802.11 wireless networks

Published: 01 October 2005 Publication History

Abstract

Mobility support is one of the most challenging issues in IEEE 802.11 networks. In the proactive neighbor caching (PNC) scheme, when a mobile host is connected to an access point (AP), its context (e.g. security association or QoS information) is propagated in advance to all of the AP's neighbors to reduce handoff processing time. In this paper, we propose a selective neighbor caching (SNC) scheme, which propagates a mobile host's context only to the selected neighbor APs considering handoff patterns. Therefore, the SNC scheme can reduce the message overhead on the links among APs. We evaluate the performance of the SNC and PNC schemes in terms of the cache hit probability and the signaling cost. Especially, we investigate the effect of mobility and cache size through extensive simulations. The results reveal that the SNC scheme provides a comparable cache hit probability while significantly reducing the signaling overhead in IEEE 802.11 networks. Moreover, although the SNC propagates relatively a small number of contexts to neighbor APs, the SNC scheme outperforms the PNC scheme when the cache size is small and the mobility is low.

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        cover image ACM SIGMOBILE Mobile Computing and Communications Review
        ACM SIGMOBILE Mobile Computing and Communications Review  Volume 9, Issue 4
        Special Issue on Medium Access and Call Admission Control Algorithms for Next Generation Wireless Networks.
        October 2005
        61 pages
        ISSN:1559-1662
        EISSN:1931-1222
        DOI:10.1145/1096166
        Issue’s Table of Contents
        Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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        Association for Computing Machinery

        New York, NY, United States

        Publication History

        Published: 01 October 2005
        Published in SIGMOBILE Volume 9, Issue 4

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