With the booming of the Internet, TCP is widely used in both wired and wireless networks. In mobile ad hoc networks, the topology changes frequently due to mobile nodes, which leads to significant packet losses and network throughput degradations. This is due to the fact that TCP fails to distinguish the link failure induced packet losses from the congestion induced packet losses. This paper proposes a novel link state routing scheme in mobile ad hoc networks -Power State Routing (PSR). By PSR,

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... a node adjusts the transmission power depending on the number of their neighbors and its transmission power. In this paper, the performance of TCP over different routing protocols in ad hoc networks was studied by simulation experiments. Four kinds of routing schemes, FSR, PSR, DSR and AODV were investigated and were analyzed to identify their characteristics when TCP is used over them in ad hoc networks.