Multimedia Multicast Services in 5G Networks: Subgrouping and Non-Orthogonal Multiple Access Techniques

Abstract

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.

Cooperative Non-Orthogonal Layered Multicast Multiple Access for Heterogeneous Networks

“…l∈A Ω h l,k . Finally, applying (20), (22) and (B.4) into (B.3), a closed-form expression of Pr(O RU 2 ) is obtained as shown in (27). This completes the proof.…”

“…Applying the above derived probability expressions of Pr(m † = m) into (61), χ B,C is derived in closed form. Finally, substituting the closed-form expression of χ B,C and the results in (20), (22) and (47) into (60), a closed-form expression of the advanced outage probability of RUs is obtained.…”

“…If cooperative NOMA unicast is employed, the same data will be sent repeatedly, resulting in low spectrum/energy efficiency. Thanks to the broadcast feature of wireless channels, wireless multicast can simultaneously send the same data to multiple users, thus being an efficient manner to serve the users with common interest [20]- [22]. When some users want the same data in NOMA systems, integrating wireless multicast into cooperative NOMA, i.e., cooperative NOMA multicast, is expected to combine their advantages.…”

“…where the second equality comes from (45). Finally, substituting (C.5) into (C.4), and then combining the results with (20), (22) and (47), the expression in (51) is obtained. This completes the proof.…”

Sum Utilization of Spectrum with Spectrum Handoff and Imperfect Sensing in Interweave Multi-Channel Cognitive Radio Networks

“…The unlicensed users cannot access the licensed bands, making the bands under-utilized [6,10]. Spectrum allocation flexibility and spectrum utilization efficiency can be achieved with different proposed technologies, such as LTE-WiFi aggregation (LWA) [11], operations in millimeter-wave band [12], LTE over the unlicensed band (LTE-U) [13], multicasting [14,15], layer-division multiplexing [14,16], ultra-dense small cells in Sustainability 2018, 10, 1764 3 of 18 5G architecture [17], non-orthogonal multiple access (NOMA) [18][19][20], and software-defined cognitive radio network (SD-CRN) [21][22][23][24][25].…”