An efficient wireless switching architecture

Authors:
Jaewook Shim;Kenneth Yun;Rene Cruz
Affiliations:
Department of Electrical and Computer Engineering, University of California, San Diego;Department of Electrical and Computer Engineering, University of California, San Diego;Department of Electrical and Computer Engineering, University of California, San Diego
Venue:
WTS'10 Proceedings of the 9th conference on Wireless telecommunications symposium
Year:
2010

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Abstract

We present a wireless switching architecture that allows a self-interference-free asynchronous packet communication in multi-channel wireless switching networks. We propose a system architecture to get around the self-interference problem, which arises due to the proximity among RF devices in the switch and the large difference in strengths between receiving and transmitting signals. We then present a straightforward solution of separating the frequency spectra used for receiving and transmitting signals and propose a MAC/PHY cross-layer protocol for efficiently managing the channel bandwidth for asynchronous packet-based communication. We show that, when a K-port wireless switch with each port providing 20 MHz of bidirectional bandwidth, the total communication bandwidth can be increased to 1.4K × 20 MHz, which is about 2K times as high as a wireless access point with 20 MHz per channel. Finally, we introduce a scheduling scheme with a dynamic load balancing to ensure global fairness for all users. The performance of our algorithm is compared to that of the Least-Loaded-First (LLF) user assignment policy using simulations.