The expected growth in the mobile video demand over the broadband cellular networks is one of the key factors driving the wireless industry to develop fifth generation of network technology. This scenario is fueling the need for group-oriented services (i.e., multicast and broadcast) in order to efficiently manage the radio resources, and consequently, grant different groups of users simultaneous access to the same multimedia content with differentiated quality of service (QoS). The evolved Multimedia Broadcast Multicast Service (eMBMS), standardized by the Third Generation Partnership Project (3GPP), is one of the technologies likely to be extended to 5G systems with the aim of addressing Point-to-Multipoint services. In addition, Non-Orthogonal Multiplexing Access (NOMA) techniques are being also considered as a driver to increase the efficient use of the spectrum in multi-user environments with asymmetric data delivery. The present article proposes the joint use of subgrouping multicast techniques and NOMA, in an eMBMS-like scenarios. Performance is evaluated in envisaged 5G environments, where different quality video services are delivered to a group of users interested in the same contents.

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The coverage area and the capacity of existing cellular network systems are not sufficient to meet the growing demand of high data rate for wireless communications. Heterogeneous Networks (HetNets) based on Long Term Evolution (LTE) can be a possible solution to enhance indoor coverage, deliver high bandwidths and off-load traffic from the macro base stations. However, this technology is still under development and several open issues have to be still investigated, such as interference coordination, power consumption, resources management and handover techniques. The aim of this work is to guarantee the reduction of power consumption using a new handover algorithm based on green policy. In addition, the proposed scheme guarantees the minimization of unnecessary handovers. The simulation campaigns have been conducted through the open-source Network Simulator 3 (NS-3).The preliminary results demonstrate that an efficient use of green approach improves the HetNETs performance in terms of power saving, energy efficiency and allow to reduces the number of unnecessary handovers

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