Enhancing peer-to-peer content discovery techniques over mobile ad hoc networks

  • Authors:

  • Diego N. da Hora;Daniel F. Macedo;Leonardo B. Oliveira;Isabela G. Siqueira;Antonio A. F. Loureiro;José M. Nogueira;Guy Pujolle

  • Affiliations:

  • Computer Science Department, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil;Laboratoire d'Informatique Paris VI (LIP6), Paris Universitas, Paris, France;Computing Institute, Federal State University of Campinas, Campinas, SP, Brazil;Computer Science Department, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil;Computer Science Department, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil;Computer Science Department, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil;Laboratoire d'Informatique Paris VI (LIP6), Paris Universitas, Paris, France

  • Venue:
  • Computer Communications
  • Year:
  • 2009

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Abstract

Content dissemination over mobile ad hoc networks (MANETs) is usually performed using peer-to-peer (P2P) networks due to its increased resiliency and efficiency when compared to client-server approaches. P2P networks are usually divided into two types, structured and unstructured, based on their content discovery strategy. Unstructured networks use controlled flooding, while structured networks use distributed indexes. This article evaluates the performance of these two approaches over MANETs and proposes modifications to improve their performance. Results show that unstructured protocols are extremely resilient, however they are not scalable and present high energy consumption and delay. Structured protocols are more energy-efficient, however they have a poor performance in dynamic environments due to the frequent loss of query messages. Based on those observations, we employ selective forwarding to decrease the bandwidth consumption in unstructured networks, and introduce redundant query messages in structured P2P networks to increase their success ratio.