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Wireless technology is becoming a leading option for
future Internet access. Transmission Control Protocol (TCP) is
one of the protocols designed on the basis of the transmission
characteristics in wired networks. It is known that the TCP
performance deteriorates drastically under a wireless communication
environment. On the other hand, many wireless networking
standards such as IEEE 802.11a, 802.11b, and 802.11g have
multirate capability. Therefore, adaptive rate control methods
have been proposed for ad hoc networks. However, almost
methods require the modification of the request to send (RTS)
and clear to send (CTS) packets. Therefore, the conventional
methods are not compatible with the standardized system.
In this paper, we propose adaptive rate control mechanisms for
ad hoc networks. Our mechanisms are based on the RTS/CTS
mechanisms. However, no modifications to the RTS and CTS
packets are required in the proposed method. Therefore, our
proposed method can attempt to satisfy the conventional IEEE
802.11 standards. Moreover, an adequate transmission rate is selected
based on an estimated TCP throughput performance. From
simulation results, it is observed that the proposed method can
improve the throughput performance without any modification
of packet structures.
