Comparison of Crawling Strategies for an Optimized Mobile P2P Architecture
T. Hoßfeld, A. Mäder, K. Tutschku, P. Tran-Gia, F.-U. Andersen, H. de Meer, I. Dedinski
Research Report 356
Abstract
Mobile networks differ from their wireline counterparts mainly by the high costs
for air transmissions and by the mobility of the users. A new entity, denoted as
the crawling peer, is suggested in order to optimize the resource mediation mechanism
for a mobile P2P file sharing application. The crawling peer locates content on behalf
of mobile peers. It is placed in the wireline part of the mobile network and thus,
does not suffer from the above mentioned restrictions. The crawling peer is part of a
comprehensive mobile P2P file sharing architecture which is based on the popular
eDonkey file sharing application. The performance of three querying strategies of the
crawling peer is investigated with respect to banning at the index servers and the
response time of requests, i.e. the time to find a file. The results show that the
selection of an appropriate request strategy for the crawling peer maximizes the
probability of locating a file while the probability to be banned by an eDonkey
index server is minimized.