# Resource Allocation Schemes for 5G Network: A Systematic Review
## 5 Discussion
### Q2. What Is the Importance of Resource Allocation in 5G?
\\  & allocation  
\begin{table}
\begin{tabular}{c c c c c c} \hline
**Ref** & **Algorithm/Scheme/Strategy** & **Problem Addressed** & **Improvements/Achievements** & **Limitations/Weakness** \\ \hline \multirow{4}{*}{[119]} & Double-sided auction-based & Intercell and inter tier & \(\bullet\) & User association & \(\bullet\) & QoS not considered. \\  & distributed resource & interference. & & satisfaction. & \(\bullet\) & Limited for small cell only. \\  & allocation (DSADRA) & & \(\bullet\) & Maximum output. & \(\bullet\) & Limited for  
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Ref** & **Algorithm/Scheme/Strategy** & **Problem Addressed** & **Improvements/Achievements** & **Limitations/Weakness** \\ \hline \multirow{4}{*}{[127]} & Mini slot-based slicing allocation problem (MISA-P) model & The probability of forming 5G slices. & \(\bullet\) & Spectral efficiency and feasibility. & \(\bullet\) & Support single slot-based model. \\  & & & & & \(\bullet\) & Limited for EMBB \\  & & &  
\begin{table}
\begin{tabular}{c c c c c c} \hline
**Ref** & **Algorithm/Scheme/Strategy** & **Problem Addressed** & **Improvements/Achievements** & **Limitations/Weakness** \\ \hline \multirow{4}{*}{[134]} & Joint user association and & Optimizing power & \multirow{4}{*}{\(\bullet\)} & Achieves higher energy & \multirow{4}{*}{\(\bullet\)} & Lack of attention to fairness and \\  & Power Control algorithm & association schemes. & & efficiency performance. & & channel state \\  & & & & & information. \\ \hline \multirow{4}{*}{[135]} & Successive convex & \multirow{4}{*}{Raise the total sum rate} & \multirow{4}{*}{\(\bullet\)} & Enhances the performance & \multirow{4}{*}{\(\bullet\)} & Lack of attention to fairness. \\  & approximation (SCA) based & & of users. & & \(\bullet\) \\  & alternate search & & of users. & \(\bullet\) \\  & method ASM) & & of SCMA. & & \\ \hline \multirow{4}{*}{[136]} & \multirow{4}{*}{An online learning algorithm for resource allocation} & Inter-tier interference & \multirow{4}{*}{\(\bullet\)} & Enhances the energy efficiency. & \multirow{4}{*}{\(\bullet\)} & Priority-based allocation of the resource block. \\  & & among RRHS and & & & \\  & for resource allocation & macro-BSs, and energy & & & \\  & efficiency. & \(\bullet\) & Maintains users’ QoS. & & \\  & & & & & \\ \hline \multirow{4}{*}{[137]} & Joint resource block (RB) and & Enhance fairness in & \multirow{4}{*}{\(\bullet\)} & Low complexity. & \multirow{4}{*}{\(\bullet\)} & Limited to \\  & power allocation scheme & data rate among & & & \(\bullet\) \\  & & end-users. & \(\bullet\) & Higher spectral efficiency. & \\  & & & & & \\ \hline \multirow{4}{*}{[138]} & Hybrid multi-carrier & Achieve the SE-EE & \multirow{4}{*}{\(\bullet\)} & Outperforms both NOMA & \multirow{4}{*}{\(\bullet\)} & Decreases \\  & non-orthogonal multiple & & tradeoff having & and OMA. & & performance \\  & access (MC-NOMA) & minimum rate & & & while adding \\  & requirement of & & & & more users. \\  & & each user. & & Enhances the tradeoff & \\  & & & & between system efficiency and user fairness. & \\ \hline \multirow{4}{*}{[139]} & \multirow{4}{*}{Stackelberg game model} & High inter-cell & \multirow{4}{*}{\(\bullet\)} & \multirow{4}{*}{Feasible and promising.} & \multirow{4}{*}{\(\bullet\)} & Focuses on \\  & & interference (ICI) and & & & limited \\  & & less energy efficiency. & & & parameters. \\  & & & & & Neglects intra-cell \\  & & & & & interference. \\ \hline \multirow{4}{*}{[140]} & Virtual code resource & \multirow{4}{*}{Reducing the collision} & \multirow{4}{*}{\(\bullet\)} & Reduces the collision & \multirow{4}{*}{\(\bullet\)} & Improves the \\  & allocation (VCRA) approach & & probability. & & code.