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TCP's congestion control suffers from a coarse granularity when applied to the multihop ad hoc environment. To overcome this problem, the authors propose a rate based Wireless Congestion Control Protocol (WCCP). There are two components in WCCP. One is at the transport layer. It replaces the window adjusting algorithm of TCP with a rate control algorithm to regulate the sending rate. The other is between the networking layer and the MAC layer. It monitors and possibly modifies the feedback field in TCP data packets when it passes the outgoing packets from the networking layer to the MAC layer and the incoming packets in the reverse direction.
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