TCP em Redes Ad Hoc: A Influência do Tamanho de Pacotes e das Filas

The use of TCP in ad hoc wireless networks does not work properly due to frequent losses that occur in the physical medium, it invokes wrongly congestion control mechanisms, that unduly reduce the transmission rate. One possibility to minimize these problems is the use of the early congestion control (ECC), a new method that acts as an active queue manager that adjusts the TCP header window field according to the use of the router queue. The approach has shown promise, bringing gains to TCP. This paper seeks to answer two questions: how the size of the packages influence the ECC behavior? and what effect of the queue size in your performance? In simulations with the ECC, DropTail, and RED, results indicated that reducing the size of the TCP packet produces more congestion, and with increasing length of the queue, congestion is reduced. With the increase/decrease is also observed that the ECC behaved similarly to the other methods, however, significantly reduced the number of delays and losses. Keywords— Wireless multihop networks, transport control protocol, active queue management.