Affiliations: Department of Computer Science, Clemson University,
Box 340974, Clemson, SC 29634, USA. Tel.: +1 864 656 7678; Fax: +1 864 656
0145; E-mail: {jzwang,zdu,srimani}@cs.clemson.edu
Note: [] Corresponding author
Abstract: This paper proposes a mobile cache model to facilitate the
cooperative proxy caching in wireless base stations. This mobile cache model
uses a network cache line to record the caching state information about a web
document for effective data search and cache space management. Based on the
proposed mobile cache model, a P2P cooperative proxy caching scheme is proposed
to use a self-configured and self-managed virtual proxy graph (VPG),
independent of the underlying wireless network structure and adaptive to the
network and geographic environment changes, to achieve efficient data search,
data cache and date replication. Based on demand, the aggregate effect of data
caching, searching and replicating actions by individual proxy servers
automatically migrates the cached web documents closer to the interested
clients. In addition, a cache line migration (CLM) strategy is proposed to flow
and replicate the heads of network cache lines of web documents associated with
a moving mobile host to the new base station during the mobile host handoff.
These replicated cache line heads provide direct links to the cached web
documents accessed by the moving mobile hosts in the previous base station,
thus improving the mobile web caching performance. Performance studies have
shown that the proposed P2P cooperative proxy caching schemes significantly
outperform existing caching schemes.
Keywords: Wireless internet, base station, proxy caching, VPG, mobile cache model, network cache line
