The goodput of TCP flow over multihops ad hoc networks varies enormously with the increase of hops number between the sender and receiver. This jitter leads to the TCP instability and impediments the web applications in multihops ad hoc networks. This paper points out and verifies that the TCP instability comes from the hidden terminal problem due to the MAC layer collisions through the analysis of the tracing data in extensive simulations. The hidden terminal will produce large volumes of packet collisions and retransmission failures at MAC layer, which results in packet dropping and consequently destroy s the TCP stability. The formalized description of the TCP instability problem and the hidden terminal ratio estimation are also given for providing TCP sending policy.
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