In Wireless era, Cross-layer designing of transmission power assignment and power control is the critical issues in emerging wireless technology. Intelligent transmission power selection algorithm depends on the notion of Transmission Power (TXPOWER), energy, Received Signal Strength Indication (RSSI) and the distance. The decentralized network without load balancing leads to network partitioning, route reliability, link failure and retransmission occurs. This power control Cross-layer design used for communicating information among the intermediate layers. LOADPOWR CONTROL Transmission power assignment algorithm in wireless networks leads to the network more efficient by using PWmin and PWmax power control technique. Euclidean distance calculates appropriate distance between sender and receiver in the network. Path loss model used to calculate difference between transmission power and received power for the amount of mobile nodes present in the LOADPOWER network. The key concept is to improve the network throughput, delay, distance, saves energy by sending all the packets with optimal transmit power according to the network load. Simulation was done in NS-2 simulator.