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The One-Sender-Multiple-Receiver Technique and Downlink Packet Scheduling in Wireless LANs



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The One Sender Multiple Receiver Technique and Downlink Packet Scheduling in Wireless LANs Zhenghao Zhang Steven Bronson Jin Xie and Hu Wei Computer Science Department Florida State University Tallahassee FL 32306 USA Abstract In this paper we study the One Sender MultipleReceiver OSMR transmission technique which allows a sender to send to multiple receivers on the same frequency simultaneously by utilizing multiple antennas at the sender OSMR has the potential to significantly improve the downlink performance of wireless LANs because with OSMR the Access Point AP can send distinct packets to multiple computers at the same time To study the practicability of OSMR in the indoor environments typical to wireless LANs we implemented a prototype OSMR transmitter receiver with GNU Software Defined Radio and conducted experiments in a university building To the best of our knowledge this is the first implementation and experimentation of OSMR Our results are positive and show that the wireless channels allow OSMR for a significant percentage of the time We also note that with OSMR packet scheduling is needed at the AP to determine when a packet should be sent and whether it should sent together with other packets using OSMR We focus on the problem of maximizing network throughout and propose a simple algorithm and prove that it has a performance ratio of 1 1 2 compared to the optimal algorithm We evaluated OSMR and our algorithm with packet traces collected from 802 11a networks and the results show that our algorithm significantly improves the network throughput Our algorithm is simple and is suitable for the implementations in APs with inexpensive processors 1 Introduction Wireless Local Area Networks LAN offer convenient access to the Internet However wireless LANs are still much slower than wired LANs For example the maximum data rate of 802 11g and 802 11a networks is 54Mps while the maximum data rate of a typical Ethernet LAN is 100Mps In addition measurement



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