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Transmission Opportunity Control for Wireless Networks with Multi-Packet Reception Capability
Daewon Jung,Jaeseon Hwang,Hyuk Lim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Recent advances in signal processing and multiuser detection (MUD) technologies, such as UWB and MIMO, provide more chances for resolving collisions in wireless networks. These advanced technologies make it possible for wireless nodes to receive multiple packets from other nodes simultaneously, achieving significant improvement in network throughput performance. In this paper, we investigate the throughput performance of wireless networks with multi-packet reception (MPR) capability, and show that MPR capability can be fully utilized by allowing wireless nodes to transmit more aggressively. We propose a transmission opportunity control scheme that determines the optimal contention window for back-off mechanisms to exploit MPR capability. Through extensive simulations, we show that the proposed transmission opportunity control scheme achieves high throughput performance, which approximates the analytic bound derived for wireless networks with MPR capability.
Daewon Jung,Jaeseon Hwang,Hyuk Lim,Kyung-Joon Park,Hou, J.C. IEEE 2010 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.9 No.2
<P>In multihop wireless networks, packets of a flow originating from a source node are relayed by intermediate nodes (relay nodes) and travel towards their destination along a multihop wireless path. Since the traffic forwarding capability of each node varies according to its level of contention, ideally, a node should not transmit more packets to its relay node than the corresponding relay node can forward. Instead, each node should yield its channel access opportunity to its neighbor nodes so that all the nodes can evenly share the channel and have similar forwarding capabilities. In this manner, nodes can utilize the wireless channel effectively, and further increase the end-to-end throughput of a multihop path. We propose a fully distributed contention window adaptation (CWA) mechanism, which adjusts the channel access probability depending on the difference between the incoming and outgoing traffic at each node, in order to equate the traffic forwarding capabilities among all the nodes in the path. We implement the proposed adaptive contention algorithm on Madwifi Linux kernel driver for Wi-Fi interface with Atheros chipset and carry out an empirical study in our division building. The experiment results demonstrate how the proposed mechanism can improve end-to-end throughput performance in the multihop wireless networks.</P>