Using Layered Division Multiplexing for Mixed UnicastBroadcast Service Delivery in 5G Pointtomultipoint (PTM) transmission is a key enabler for a wide range of emerging 5G New Radio (NR) applications and use cases. For more efficient use of spectrum, 3GPP is working on a 5G multimedia broadcast multicast service (5GMBMS) subsystem, aiming at providing effective mixed unicastmulticastbroadcast services on a unified transmission platform. This paper shows that, in many cases, especially highdensity small cell deployments, capacity of the current single frequency multicell unicast service in the 4G5G infrastructure is limited by cochannel interference. Using a reduced transmission power to a certain extent will not impact the system performance and throughput. Meanwhile, for broadcast services using single frequency network (SFN), there is no cochannel interference. Signals from adjacent cells are identical, which enhances the reception quality. Slightly reducing the broadcast service SFN emission power will not impact the system quality of service (QoS). This provides a good opportunity to apply layered division multiplexing (LDM), a powerbased nonorthogonal multiplexing (PNOM) technology, to combine broadcast and unicast services in one RF channel by power sharing. This study demonstrates that, in a 5GMBMS with twolayer PNOMLDM, broadcast SFN and multicell unicast services can be efficiently and effectively delivered using the same spectrum resource.

Using LayeredDivisionMultiplexing to Achieve Enhanced Spectral Efficiency in 5GMBMS 3GPP is pursuing a multimedia broadcast multicast service subsystem in 5G (5GMBMS) based on the latest LTE further evolved MBMS (feMBMS) system in Rel. 14. In this paper, Layered Division Multiplexing (LDM) is proposed as a new addition to the 5G technology toolbox for achieving significantly enhanced spectral efficiency for the 5GMBMS to efficiently deliver mixed broadcast and unicast services. A capacity analysis is first conducted to derive the capabilities of an LDMbased 5GMBMS system to deliver broadcast and unicast services in the different signal layers, under the conditions with severe cochannel interference (CCI). It is shown that using LDM can provide a nearly fullcapacity unicast network on top of highquality broadcast network. The broadcast capacity is mainly determined by the power allocations between the two signal layers. The unicast capacity can be maximized by deliberately operating the system in a CCIlimited mode. Simulation results are presented to demonstrate the capacity gain that can be achieved by incorporating LDM in the 5GMBMS system. This study shows that LDM is one of the enabling technologies to close the gap between the LTE feMBMS capability and the 5GMBMS requirements.