Link efficiency and fairness are two important metrics concerning network performance. To attain such performance goals in a network, proper congestion signaling is essential. Explicit Congestion Notification, ECN has been proved to provide a faster indication of congestion and thus better the performance of a TCP/IP network. In this paper, we present a new scheme for ECN named Fair In-time Marking, FIM which employs a mechanism that along with providing an indication of incipient congestion assures a fair service to all the connections. This is important as the client base of the Internet is rapidly increasing and the demand for a reasonably fair service is getting strong. We have shown through simulations that FIM offers the best fairness without hampering efficiency compared with other proposed sehemes for ECN.
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