TCP-CReno — TCP enhancement using cross-layer for Cognitive Radio Networks

In Cognitive Radio Networks, cognitive radio users have to sense and occupy the free channel, and continuously check the channel status. Once primary user needs to utilize this channel, the transmission must stop as not to cause interference, which significantly decreases the performance of TCP. In this paper, we propose an improved transport protocol, called TCP-CReno. This new protocol can obtain the current channel status by interacting with Mac layer and modify the transmission status at source. Simulations in NS2 indicate that TCP-CReno increases the sending rate, reduces the retransmission ratio at the source, and improves the whole performance.