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Many of the recently proposed high performance congestion control protocols rely on an estimation of the available link bandwidths. Specially, XCP and VCP need an explicit knowledge of the link bandwidth. However, wireless networks are characterized by bandwidth variations due to the openness of air links. Experiments have clearly shown that operating over variable bandwidth wireless links can lead to a significant performance degradation of congestion control protocols. Such degradation is typically manifested in the form of exhibiting oscillatory behavior. In this paper, the authors propose the use of an Extended Kalman Filter (EKF) to filter out the impact of bandwidth variations from the operation of wireless congestion control protocols.
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