TCP performance optimization in multi-cell wireless local area networks
Proceedings of the 12th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
Average-value analysis of 802.11 WLANs with persistent TCP flows
IEEE Communications Letters
IEEE Communications Letters
Performance of different TCP variants in IEEE 802.11 WLAN and the TCP-WOW algorithm
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
TCP performance optimization in multi-cell WLANs
Performance Evaluation
Unified fixed-point analysis of IEEE 802.11 WLAN under saturated and unsaturated conditions
Wireless Communications & Mobile Computing
Analytical modeling of TCP flow in wireless LANs
Mathematical and Computer Modelling: An International Journal
A cross-layer TCP enhancement in QoS-aware mobile ad hoc networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Wireless Transport Layer Congestion Control Evaluation
International Journal of Wireless Networks and Broadband Technologies
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There is a vast literature on the throughput analysisof the IEEE 802.11 MAC protocol. However, very little has beendone on investigating the interplay between the collision avoidancemechanisms of the 802.11 MAC protocol and the dynamicsof upper-layer transport protocols. In this paper we tackle thisissue from an analytical, simulative and experimental perspective.Specifically, we develop Markov chain models to compute thedistribution of the number of active stations in an 802.11 WLANwhen long-lived TCP connections compete with finite load UDPflows. By embedding these distributions in the MAC protocolmodelling, we derive approximate but accurate expressions ofthe TCP and UDP throughput. We validate the model accuracythrough performance tests carried out in a real WLAN for a widerange of configurations. Our analytical model and the supportingexperimental outcomes show that: i) the total TCP throughput isbasically independent of the number of open TCP connections,and the aggregate TCP traffic can be equivalently modelled astwo saturated flows; and ii) in the saturated regime n UDP flowsobtain about n-times the aggregate throughput achieved by theTCP flows, independently of the overall number of persistentTCP connections. Index Terms--802.11 MAC protocol, TCP,UDP, performance modelling, Markov chain.