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In MANETs, due to frequent node mobility, data packets switch from one route to another route without the knowledge of sender. Due to this, packets may not be delivered to the receiver in order or packets may be delayed before which the receiver sends a Duplicate ACK to the sender resulting in unnecessary retransmissions. A cross-layer-mechanism called Route-Control was proposed by Cohen and Levin in 2009. This aims at informing the sender about the route change with the help of TCP ACKs sent by the receiver. This information benefits the sender to decide whether to retransmit the missing segments or to wait. It also helps the sender in estimating the RTT (Round Trip Time) and to decide whether to change the congestion window.
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