A Software Defined Radio based FeMBMS Measurement Receiver: Test Results In 2017, the 3rd Generation Partnership Project (3GPP) introduced xe2x80x9cFurther evolved Multimedia Broadcast Multicast Service (FeMBMS)xe2x80x9d as an extension of the Long Term Evolution (LTE) standard as 3GPP Release 14. FeMBMS includes a dedicated broadcast transmission mode on a separate carrier with an Orthogonal FrequencyDivision Multiplexing (OFDM) Cyclic Prefix (CP) length of 200 mu mathrms, allowing content providers to offer popular services via FeMBMS using existing High Tower, High Power (HTHP) or Medium Tower, Medium Power (MTMP) infrastructure. Synchronization signals and basic signaling information for FeMBMS are periodically transmitted via a Cell Acquisition Subframe (CAS) utilizing the traditional OFDM CP length of only 16.67 mu mathrms. The influence of the short CP length used for transmitting the CAS requires further evaluation.Due to Technische Universitat Braunschweigxe2x80x99s (TUBS) profound experience with its invention Tower Overlay over LTEA, a predecessor of FeMBMS, we were able to implement the worldxe2x80x99s first FeMBMS transmitter and receiver based on our software defined radio toolkit.After detailing the architecture of the FeMBMS dedicated mode, this paper presents the relevant mechanisms of the TUBS 3GPP Release 14 FeMBMS receiver and evaluates the performance of the FeMBMS dedicated broadcast transmission mode based on a field measurement campaign focusing on the reception performance.

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.