 the next paragraph, the specifics of inner, outer, and edge allocations are discussed. 12.3.4.1.1 Inner versus Outer Allocation Concept Figure 12.12 (left) presents MPR simu- lation results of required power reduction for all possible allocations within a 5 MHz channel bandwidth using a CP-OFDM signal which is QPSK-modulated with 15 kHz SCS. The simulation was performed using a power class 3 amplifier model. In this plot, the x-axis is RB start and the y-axis is LCRB RB start is the lowest RB index of the transmitted RBs within the channel, and LCRB is the transmission bandwidth expressed as the length of contiguous RBs. As an example, the top of the triangle is RB start and LCRB = 25, and this represents the fully allocated 5 MHz channel bandwidth signal with a 15 kHz SCS. When examining Figure 12.12 (left), we see that the required MPR follows certain patterns; for example, when L increases, then the required MPR also increases. This is caused by the fact that wider signals cause more unwanted emissions, and in order for the UE not to exceed unwanted emission limits, it may need to reduce the output power. Another noticeable pattern is that if the allocation is in the middle of the channel, then the need for MPR is lower, and in Figure 12.12 (left), this region is the white-colored triangle. After exhaustive simulations and measurements work, 3GPP RAN4 decided to spec- ify the 5G MPR based on outer, inner, and edge allocations scheme, which is presented in Figure 12.12 (right). It is to be noted that all allocation sizes LCRB are possible for CP-OFDM waveforms, but the DFT-s-OFDM waveforms have restrictions on the allo- cation sizes which, by RAN1 design, must have a length of the form 2x X 3y X 5 , with X, y, and Z being integers; these are denoted by a cross in Figure 12.12 (right). This definition of different regions for allocations allowed the optimization of MPR values. The outer allocations are on the edge of the channel, and thus spectral regrowth due to PA nonlinearity extends almost entirely outside 