Abstract:

At present, wired networks, wireless networks, satellite networks and high-speed

networks all can carry the data payload, and the main features of heterogeneous networks are

high BER (Bit Error Rate), long delay, asymmetry of bandwidth in some links, and so on.

Since TCP is designed for normal wired networks so as not to work very well in heterogeneous

networks. OPNET is used to simulate heterogeneous networks, and obtain the regular of how

the BER, delay and asymmetry affect the TCP performance.  The obtained regular can provide a

reference for experiments on optimization of TCP performance in challenged networks.

Key words: heterogeneous networks;bit error rate;delay;asymmetry;TCP performance;OPNET