The changing usage of a mature campus-wide wireless network
Proceedings of the 10th annual international conference on Mobile computing and networking
Social Serendipity: Mobilizing Social Software
IEEE Pervasive Computing
Access and mobility of wireless PDA users
ACM SIGMOBILE Mobile Computing and Communications Review
Telos: enabling ultra-low power wireless research
IPSN '05 Proceedings of the 4th international symposium on Information processing in sensor networks
ACM SIGMOBILE Mobile Computing and Communications Review
Impact of Human Mobility on Opportunistic Forwarding Algorithms
IEEE Transactions on Mobile Computing
Toward stochastic anatomy of inter-meeting time distribution under general mobility models
Proceedings of the 9th ACM international symposium on Mobile ad hoc networking and computing
Peopletones: a system for the detection and notification of buddy proximity on mobile phones
Proceedings of the 6th international conference on Mobile systems, applications, and services
Design, implementation and evaluation of an efficient opportunistic retransmission protocol
Proceedings of the 15th annual international conference on Mobile computing and networking
Opportunistic use of client repeaters to improve performance of WLANs
IEEE/ACM Transactions on Networking (TON)
Private and Flexible Proximity Detection in Mobile Social Networks
MDM '10 Proceedings of the 2010 Eleventh International Conference on Mobile Data Management
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Opportunistic networking: data forwarding in disconnected mobile ad hoc networks
IEEE Communications Magazine
A simple Cooperative diversity method based on network path selection
IEEE Journal on Selected Areas in Communications
Casting doubts on the viability of WiFi offloading
Proceedings of the 2012 ACM SIGCOMM workshop on Cellular networks: operations, challenges, and future design
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Wireless network providers are under tremendous pressure to deliver unprecedented amounts of data to a variety of mobile devices. A powerful concept that has only gained limited traction in practice has been the concept of opportunistic networks whereby nodes opportunistically communicate with each other when in range to augment or overcome existing wireless systems. One of the key impediments towards the adoption of opportunistic communications has been the inability to demonstrate viability at scale, namely showing that sufficient opportunities exist and more importantly exist when needed to offer significant network performance gains. We demonstrate through a large-scale, longitudinal study of smartphone users that significant opportunities are indeed prevalent, are indeed stable, and end up being reasonably reciprocal both on short and long-term timescales. In this paper, we propose a framework dubbed PSR (Prevalence, Stability, Reciprocity) to capture key aspects that characterize the net potential for opportunistic networks which we feel merit significantly increased attention.