A selective neighbor caching scheme for fast handoff in IEEE 802.11 wireless networks

Sangheon Pack, Hakyung Jung, Taekyoung Kwon, Yanghee Choi

Research output: Contribution to journalConference articlepeer-review

43 Citations (Scopus)


Mobility support in IEEE 802.11 networks is a challenging issue. Recently, a new scheme called proactive neighbor caching (PNC) was proposed and adopted as an IEEE standard. The PNC scheme introduces a neighbor graph, which dynamically captures the mobility topology of a wireless network for pre-positioning a mobile host (MH)'s context. However, the PNC scheme may result in significant signaling overhead because the MH's context is propagated to all neighbor access points (APs). In this paper, we propose a selective neighbor caching (SNC) scheme, which propagates a MH's context to only the selected neighbor APs considering handoff frequencies between APs. When the context transfer is needed, neighbor APs with equal handoff probabilities to or higher handoff probabilities than a predefined threshold value are selected. We also derive an optimal threshold value when the target cache hit probability is given. Simulation results reveal that the SNC scheme significantly reduces the signaling overhead while guaranteeing a comparable cache hit probability compared to the PNC scheme.

Original languageEnglish
Pages (from-to)3599-3603
Number of pages5
JournalIEEE International Conference on Communications
Publication statusPublished - 2005
Externally publishedYes
Event2005 IEEE International Conference on Communications, ICC 2005 - Seoul, Korea, Republic of
Duration: 2005 May 162005 May 20

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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