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To solve the problems of heterogeneous wireless network, such as scarce spectrum resources, interference among radio resources and blindness area caused by excessive demands of mobile users, a novel system which integrates the power line carrier (PLC) and the wireless network (WN) with the attractor selection algorithms is proposed. Due to multi-selected paths being transmitted information according to the network environment, the robustness and stability of the integrated the PLC and the WN (IPWN) are improved. Moreover, to transmit the data packets in the different communication protocol of PLC and WN, the effective virtual layer (EVL) above the network layer is employed to convert protocol between the PLC and the WN by resealing the packet. Then, the attractor selection algorithm is employed to select the optimal path among the PLC or the WN adaptively according to the external conditions. Simulation results demonstrate that, comparing to the PLC and the WN, the packet delay of the IPWN is smaller with the increase of the packets, and the IPWN has strong robustness and stability.

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Machine Type Communication (MTC) in the cellular network with ubiquitous coverage and various applications has played an important role in our daily life. For security, MTC devices need to follow the Evolved Packet System-Authentication and Key Agreement (EPS-AKA) protocol to guarantee the secure requirements in the machine-to-machine (M2M) communications. However, a huge number of terminal devices tried to complete the authentication procedure simultaneously, which would bring a severe congestion and overload for the network. In this paper, we proposed an efficient, available and scalable group controller-based authentication and key agreement (GC-AKA) protocol for devices to ensure the safety in the long term evolution (LTE) network. Through a design of group controller and simplicity of devices' work in the authentication process, it would be more secure and efficient for resource-constrained devices in the communications between device and the cellular network, while providing simultaneous authentications for a mass of devices without congestion and overload in the network.