Topology-Aware Integration of Cellular Users into the P2P System

Integration of cellular users into the peer-to-peer (P2P) network is still in limbo due to limitations caused by heterogeneity, mobility and time-varying capacities of the wireless channel. If traditional Chord is employed to include users from the cellular networks, users under the same base station scatter in logical topology randomly. In this paper, we present a novel cellular Chord (C-Chord) P2P system that integrates the cellular users into the well-established structured P2P network in topology-aware fashion. C-Chord offers the cellular users a choice of downloading contents either from the Internet peers at faster rate or from other cellular users from the same base station avoiding Internet data penalty. We conduct extensive simulations to evaluate the performance of the proposed C-Chord P2P system. The path-length per lookup query is smaller than that of the traditional Chord system. Overhead due to renewal of routing information is also smaller for the cellular users in the C-Chord system. We also measure the throughput at the cellular receivers to analyze the effects of selecting peers either from same base station or from outside the Internet gateway.