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| Technique | Advantages | Limitations |
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| Decode-and-Forward (DF) [16] | Increases coverage area without expanding the transmission power of source node | Relaying transmission caters to enhance the latency |
| Truncated Decode and Forward (TDF) [17] | Improves spectral efficiency while minimizing delay | Increases total latency due to retransmission |
| Adaptive Relay Transmission Selection (ARTS) [18] | Selects relay transmission with minimum latency | More affected by overhead with relay transmission |
| Information theoretic approach [19] | If relay channels are strong and robust, then AF and DF attain less latency | If uplink and downlink are weak channels, then AF and DF cater negative impact on latency |
| Information theoretic technique [20] | While considering more number of hops, DF performs better than AF | At each hop, latency increases by amplifying noise signals |
| Joint power and bandwidth allocation strategies [21] | Particular to channel conditions, joint optimization methods yield higher transmission rates as compared to single power optimization scheme | Channel capacity enhancement has not been discussed in these studies |
| Feasible solution construction (FSC) algorithm [22] | Joint optimization problem of flow routing and relay node assignment for concurrent sessions to improve capacity of wireless networks | It is hard to solve the computational complexity of this algorithm |
| AP coverage adjustment problem (ACAP) and user association optimization problem (UAOP) [23] | Provides optimal solutions for large-scale networks quickly with low overhead | Gap between AP utilization increases by increasing the traffic demands |
| -bounded approximation [24] | Executes both upper and lower bound tight solutions quickly without finding maximal independent sets | However, is still system control parameter |
| Heuristic-based approach [25] | Examined good fairness index per user, average hop count, and less number of MR handover events | The average hop count is increased as compared to HWMP method |
| Load balancing algorithm [26] | Provides better performance with reference to network throughput and data dropped in WLAN | Association and reassociation of load with access points increase the switching delay |
| Frequency allocation scheme [27] | Reduces the number of operational gateways comparatively to the fixed allocation method | Digital channelizer degrades the SINR due to the imbalance received power |
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