Characterizing user behavior and network performance in a public wireless LAN
SIGMETRICS '02 Proceedings of the 2002 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
netWorker
Analysis of a campus-wide wireless network
Proceedings of the 8th annual international conference on Mobile computing and networking
Theoretical Maximum Throughput of IEEE 802.11 and its Applications
NCA '03 Proceedings of the Second IEEE International Symposium on Network Computing and Applications
Adaptive QoS management for IEEE 802.11 future wireless ISPs
Wireless Networks
Design and evaluation of a new MAC protocol for long-distance 802.11 mesh networks
Proceedings of the 11th annual international conference on Mobile computing and networking
IEEE Communications Magazine
Approaches to spectrum sharing
IEEE Communications Magazine
IEEE Communications Magazine
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One application of cognitive radios is to provide broadband wireless access (BWA) in the licensed TV bands on a secondary access basis. This concept is examined to see under what conditions BWA could be viable. Rural areas require long range communication which requires spectrum to be available over large areas in order to be used by cognitive radios. Urban areas have less available spectrum at any range. Furthermore, it is not clear what regulatory model would best support BWA. This paper considers demographic (urban, rural) and licensing (unlicensed, nonexclusive licensed, exclusive licensed) dimensions. A general BWA efficiency and economic analysis tool is developed and then example parameters corresponding to each of these regimes are derived. The results indicate that an unlicensed model is viable; however, in urban areas spectrum needs can be met with existing unlicensed spectrum and cognitive radios have no role. In the densest urban areas, the licensed models are not viable. This is not simple because there is less unused spectrum in urban areas. Urban area cognitive radios are constrained to short ranges and many broadband alternatives already exist. As a result the cost per subscriber is prohibitively high. These results provide input to spectrum policy issues.