Addressing non-homogeneities in a ubiquitous P2P platform for context exchange

We propose mechanisms to combat the congestion caused by non-homogeneities in the distribution of information, the peers´ locations, and the demand for information in a peer-to-peer system for exchanging context. We propose two novel mechanisms for adapting the topology formed by the peers to the underlying traffic: our first mechanism employs virtual locations for the peers while the second modifies the edges connecting them. The positive effect of our mechanisms is evaluated experimentally. Our key metric is the average query delay, a critical performance indicator in a prototypical system we have already presented, expected to be used by mobile users for exchanging contextual information.