Channel access using opportunistic reservations and virtual MIMO

Authors:
Xin Wang;J. J. Garcia-Luna-Aceves;Hamid R. Sadjadpour
Affiliations:
Department of Computer Engineering, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, United States;Department of Computer Engineering, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, United States and Palo Alto Research Center (PARC), 3333 Coyote Hill Road, Palo Al ...;Department of Electrical Engineering, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, United States
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2009

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Abstract

We propose ORCHESTRA, a channel-access protocol that uses reservations and virtual MIMO to provide high throughput and bounded channel-access delays. The channel-access process is divided into a contention-based access period and a scheduled access period. To attain high throughput, nodes build a channel schedule using the contention-based access period, and utilize the spatial multiplexing gain of virtual MIMO links in the scheduled access period. To attain bounded channel-access delays, nodes reserve time slots through opportunistic reservations. We evaluate the performance of ORCHESTRA through numerical analysis and simulations, and show that it results in much better throughput, delay, and jitter characteristics that simply using MIMO nodes together with scheduled access (i.e., NAMA) or contention-based access (i.e., IEEE 802.11 DCF).