MAC-Layer Scheduling in Cognitive Radio based Multi-Hop Wireless Networks
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WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
A distributed opportunistic access scheme and its application to OFDMA systems
IEEE Transactions on Communications
Distributed uplink scheduling in CDMA networks
NETWORKING'07 Proceedings of the 6th international IFIP-TC6 conference on Ad Hoc and sensor networks, wireless networks, next generation internet
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IEEE Transactions on Wireless Communications
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IEEE Transactions on Wireless Communications
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IEEE Transactions on Wireless Communications
Exploiting multiuser diversity in reservation random access
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Distributed uplink scheduling in OFDMA systems is considered. In the proposed model, mobile terminals have the responsibility of making their own transmission decisions. The proposed scheme is based on two dimensional reservation in time and frequency. Terminals use channel state information in order to favor transmissions over certain subchannels, and transmission is done in a probabilistic manner. The proposed approach provides more autonomy to mobile devices in making transmission decisions. Furthermore, it allows avoiding collisions during transmission since it leads to collision detection during the resource reservation phase. The proposed approach is compared to other random access methods and shown to be superior in terms of increasing sum-rate, reducing the number of users in outage, and reducing the collision probability in the reservation phase.