Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: TCP-based window-size delegation method for TXOP Exchange in wireless local area networks | Nishio et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 58 EURASIP Journal on . http content 20ii i 58 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access TCP-based window-size delegation method for TXOP Exchange in wireless local area networks Takayuki Nishio 1 Ryoichi Shinkuma1 Tatsuro Takahashi1 and Go Hasegawa2 Abstract We propose a TCP window-size delegation method for downlink TXOP transmission opportunity Exchange in wireless local area networks WLANs . In our method the compliant stations STAs cooperatively use their available bandwidth in accordance with their throughput demand. We realize our method only with minimal modifications of the TCP functions of a proxy server which lets one station the TXOP provider delegate TCP window size to another station the TXOP client so that the provider delegates its TXOPs in WLANs to the client. Our method enables an STA to flexibly delegate TXOPs to another STA without adversely affecting the legacy STAs which is confirmed by computer simulations. We also confirmed that our method requires no modification to legacy access points and STAs. Keywords Bandwidth delegation TCP window size TXOP Exchange Wireless local area networks 1 Introduction In offices homes and public spaces IEEE wireless local area networks WLANs has been extensively used to provide wireless Internet connection services. In WLANs stations STAs connected to an access point AP compete for transmission opportunities TXOPs using the carrier sense multiple access with collision avoidance CSMA CA . TXOPs are almost equally assigned to the STAs and the AP without considering each STA s throughput demand especially when the traffic load is heavy. Although many quality of service QoS control mechanisms applicable for WLANs have been proposed including IEEE IntServ and Diff-Serv 1-3 they are not widely used basically because they require physical replacement of .
