Contemporary wireless multihop networks work much underneath their capacity because of the poor coordination among transmitting nodes. Cross-layer architectures offer a radical option by upholding participation among the numerous layers of the protocol stack. At the center of these architectures is the backpressure scheduling algorithm which accomplishes the system limit. XPRESS is throughput-optimal backpressure architecture for wireless multihop networks. XPRESS is made out of a central controller, which performs backpressure scheduling taking into account the deliberate wireless network state, furthermore of the wireless nodes, which intermittently give the network estimations and execute the registered timetable utilizing a cross-layer protocol stack.