A WBAN is predicted as a valuable technology being used in many applications, especially in medical application for monitoring and detection of possible problems of patients. Some of the issues are addressed in WBANs, in which the critical issues need to be solved are energy saving and security along with inter-WBANs interference. To evade the inter-WBANs interference along with the control the transmission power on WBAN system, this paper presents a cooperative based power control game algorithm which is utilized with the social interaction information model. In order to manage the WBAN with the security measures to transmit the patient data throughout the system an Elliptic Curve Cryptography (ECC) algorithm is used for authentication before initiating the transmission. The performance of the proposed approach is evaluated along with the increased number of nodes while the occurrence of an interference problem is also rigorous. The proposed approach provides the better results where the power is increased to maximize the system life time of WBAN communication through power game approach, which also mitigates the interference problem efficiently. The WBAN system uses ECC algorithm to perform authentication, encryption and decryption, which yield better security of patient data to establish the communication between the numbers of WBAN.