In Mobile Ad-hoc Network (MANET) is a Self-configuring network of mobile routers (and associated hosts) connected by wireless links. This MANET forms a random topology and routers move randomly free. Topology changes rapidly and unpredictably .Nowadays we are using so many protocols for maximizing the network bandwidth but, we can not attain the best throughout using protocols in MANET .Here narrate so many protocols and their con’s which are not providing the maximum throughput, maximizing performance then overcome this issues. we propose a Capacity-Optimized Cooperative (COCO) topology control scheme to improve the network capacity in MANETs by jointly considering both upper layer network capacity and physical layer cooperative communications. Through simulations, we show that physical layer cooperative communications have significant impacts on the network capacity, and the proposed topology control scheme can substantially improve the network capacity in MANETs with cooperative communications. Suitable for emergency situations like natural or human-induced disasters, military conflicts, emergency medical situations, etc.