Transmission control protocol (TCP) performing better in a wired network, but not in wireless ad hoc network. Wireless ad hoc network has special characteristics like as node can move freely and a shared channel. Due to those characteristic, TCP facing some problems in wireless ad-hoc networks like as link failure, channel contention and high BER. The performance of TCP depredates due to these above-mentioned factors. The research community has been suggested some approaches to improve the performance of TCP in wireless ad hoc network. By exchanging the data among different layers in cross layer design, the performance of wireless networks is improved. This paper focuses on cross-layer approaches between network layer and transport layer to improve TCP’s performance.