# Analysis of Power Allocation for NOMA-Based D2D Communications Using GADIA
## 2 Related Work  
Most general 5G deployments heterogeneous services are permitted to coexist within the same network; moreover, the authors in [16] investigated the network structure slicing based on 5G. Accordingly, recent research works of 5G architectures concentrate on designing a network with low-cost base stations, low latency and high bandwidth abilities to sustain the diverse 5G applications. That introduces the front link bandwidth requirement exceeding what the current technologies, for instance, Common Public Radio Interface (CPRI), can provide the necessity for new transport technologies [17; 18]. A promising method to perform these design purposes is by employing the concept of function split that is specified by 3 GPP standard [19], and it has been comprehensively studied in [20]. The 5G slicing network architecture in the existence of orthogonal slicing has been introduced in [16; 21]. The dynamic scheduling of the downlink multiplexing for URLLC traffic over continuing eMBB transmissions is investigated in [5; 22] by abstracting the procedure at the physical layer. The authors in [23] propose a cost analysis of some of the PHY layer function split prospects. [PERSON] et al. in [24] consider the role of feedback in the regard of resource allocation for mMTC and URLLC in a new radio (NR) setting. [PERSON] et al. in [25] proposed a scheduling policy to decrease jitter. In [26], [PERSON] et al. investigated the orthogonal resource allocation for mMTC and eMBB users through imputation the intercell interference. Grant-free uplink transmissions are deemed in [27] for the three services by evaluating a particular transmission/modulation/spreading methods for sustaining the three services. In contrast, numerous works present an extensive analysis of the impact that virtualization has on latency, furthermore testing the performance through various virtualization circumstances, e.g., kernel-based virtual machine (KVM) and VirtualBox investigated in [28; 29; 30; 31]. Additionally, authors in [32; 33; 34; 35; 36] have already briefly described Random-access (RA) based schemes for the URLLC and mMTC [35; 36] individually. A comprehensive review of the scheduler prospects in 5G NR is provided in [3], particularly classifications of new scheduling formats and levels of freedom added to promote URLLC and additional services. Moreover, several studies on the dynamic link adaptation and MAC layer for URLLC have been conducted in the literature (see, e.g., [37; 38]). The fundamental concept of diversity and coding techniques were investigated in [39]. The hybrid automatic repeat request (HARQ) enhancements discussed in [40; 41], and the authors in [42; 43] addressed the variable transmission time intervals (TTIs). [PERSON] et al. in [44] studied the optimization of the efficient bandwidth allocation for each device using 5G technology in orthogonal frequency-division multiplexing (OFDM) systems and reported an improvement for reliable wireless communications. NOMA concept is also introduced in conjunction with other techniques, such as MIMO or mmWave [45; 46]. Many previous works have investigated NOMA technology's potential contributions to 5G-and-beyond wireless networks [47; 48; 49]. However, these works are built on traditional wireless techniques driven by broadband communications and are often inefficient for URLLC.