OFDM for Wireless Multimedia Communications
OFDM for Wireless Multimedia Communications
Tight approximation algorithms for maximum general assignment problems
SODA '06 Proceedings of the seventeenth annual ACM-SIAM symposium on Discrete algorithm
Efficient resource management in OFDMA Femto cells
Proceedings of the tenth ACM international symposium on Mobile ad hoc networking and computing
DIRC: increasing indoor wireless capacity using directional antennas
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
Coordinated beamforming for the multicell multi-antenna wireless system
IEEE Transactions on Wireless Communications
CTRL: a self-organizing femtocell management architecture for co-channel deployment
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Pushing the envelope of indoor wireless spatial reuse using directional access points and clients
Proceedings of the sixteenth annual international conference on Mobile computing and networking
FERMI: a femtocell resource management system forinterference mitigation in OFDMA networks
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
A distributed resource management framework for interference mitigation in OFDMA femtocell networks
Proceedings of the thirteenth ACM international symposium on Mobile Ad Hoc Networking and Computing
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Small cells form a critical component of next generation cellular networks, where spatial reuse is the key to higher spectral efficiencies. Interference management in the spatial domain through beamforming allows for increased reuse without having to sacrifice resources in the time or frequency domain. Existing beamforming techniques for spatial reuse, being coupled with client scheduling, face a key limitation in practical realization, especially with OFDMA small cells. In this context, we argue that for a practical spatial reuse system with beamforming, it is important to decouple beamforming from client scheduling. Further, we show that jointly addressing client association with beamforming is critical to maximizing the reuse potential of beamforming. Towards our goal, we propose ProBeam -- a practical multi-cell beamforming system for reuse in small cell networks. ProBeam incorporates two key components - a low complexity, highly accurate SINR estimation module that helps determine interference dependencies for beamforming between small cells; and an efficient, low complexity joint client association and beam selection algorithm for the small cells that accounts for scheduling at the small cells without being coupled with it. We have prototyped ProBeam on a WiMAX-based network of four small cells. Our evaluations reveal the accuracy of our SINR estimation module to be within 1 dB, and the reuse gains from joint client association and beamforming to be as high as 115% over baseline approaches.