Unified Comms

Exploiting Opportunistic Scheduling in Cellular Data Networks

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Executive Summary

Third Generation (3G) cellular networks utilize time varying and location-dependent channel conditions to provide broadband services. They employ opportunistic scheduling to efficiently utilize spectrum under fairness or QoS constraints. Opportunistic scheduling algorithms rely on collaboration among all mobile users to achieve their design objectives. However, the authors demonstrate that rogue cellular devices can exploit vulnerabilities in opportunistic scheduling algorithms, such as Proportional Fair (PF), to usurp the majority of time slots in 3G networks. The simulations show that only five rogue device per 50-user cell can use up to 90% of the time slots, and can cause 2 seconds of end-to-end inter-packet transmission delay on VoIP applications for every user in the same cell, rendering VoIP applications useless.

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