Towards Practical Spectrum Permits
Ben Y. Zhao
IEEE Transactions on Cognitive Communications and Networking (TCCN)
[Full Text in PDF Format, 945KB]
As spectrum is being released from legacy technologies, reforms in policies and regulations promise to spur
wireless growth by distributing spectrum dynamically across wireless networks matching their traffic demands.
However, a major obstacle to its adoption remains. There is no effective solution to protect licensed users
from spectrum misuse, where users transmit without properly licensing spectrum, and in doing so, interfere and
disrupt legitimate flows to whom the spectrum is assigned (and sold). In this article, we discuss an initial
step towards enforcing dynamic spectrum allocation using the concept of spectrum permit, where authorized
spectrum users embed secure spectrum permits into data transmissions, enabling patrolling trusted devices to
detect devices transmitting without authorization.We highlight the development of spectrum permits, and
describe Gelato, a spectrum misuse detection system that minimizes both hardware costs and performance
overhead on legitimate data transmissions.We implement Gelato using USRP2 with laptops and lower cost RTL-SDR
devices with smartphones. We show that both implementations are robust against attacks and can reliably detect
spectrum permits in real time.