Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Cross-layer based adaptive wireless traffic control for per-flow and per-station fairness | Visoottiviseth et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 97 EURASIP Journal on . http content 2011 1 97 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Cross-layer based adaptive wireless traffic control for per-flow and per-station fairness Vasaka Visoottiviseth1 Akkasit Trunganont1 and Siwaruk Siwamogsatham2 Abstract In the IEEE wireless LANs the bandwidth is not fairly shared among stations due to the distributed coordination function DCF mechanism in the IEEE MAC protocol. It introduces the per-flow and per-station unfairness problems between uplink and downlink flows as the uplink flows usually dominate the downlink flows. In addition some users may use greedy applications such as video streaming which may prevent other applications from connecting to the Internet. In this article we propose an adaptive cross-layer bandwidth allocation mechanism to provide per-station and per-flow fairness. To verify the effectiveness and scalability our scheme is implemented on a wireless access router and numerous experiments in a typical wireless environment with both TCP and UDP traffic are conducted to evaluate performance of the proposed scheme. Keywords wireless local area network per-station fairness traffic control bandwidth allocation 1. Introduction Nowadays the IEEE 1 wireless local area networks WLANs have become the common network infrastructure for most organizations. In typical wireless environments the bandwidth will be shared among wireless devices while wireless access points or routers act as hubs connecting these devices together. In general the bandwidth may not be equally shared among users in the same WLAN because some users may utilize greedy applications that consume much larger bandwidth and consequently prevent other applications from connecting to the Internet. These applications include for example video streaming applications download
