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| Paper | Considered MAC parameters | Contribution |
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| Adaptive and real time protocols [20] | Backoff exponent (BE) | Analysis of macMinBE and macMaxBE values: by increasing these values the delay increases and the throughput decreases; however collision probability decreases and vice versa |
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| Analysis of CAP [36] | BE | For large networks, the throughput is independent of the BE initial value; however, for small networks it generates high impact |
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| A comprehensive analysis of the MAC unreliability problem [37] | Contention windows (CW) | Propose CW values for time critical applications; higher values of CW reduce collision chances; however, for time critical applications where ACK is disabled the CW is set to lower values for fast communications |
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| MAC unreliability problem in IEEE 802.15.4 WSN [38] | Retransmissions | In ideal channel conditions, when the number of retransmissions is increased from 1 to 2, a significant improvement is observed in packet delivery; however, there is no significant improvement in packet delivery if the number of retransmissions is increased from 2 to 7 |
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| Performance evaluation with different backoff ranges [39] | BE | Provide priority-based QoS by assigning different BE values to different applications |
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| Priority-based delay mitigation for event monitoring [40] | MAC frame modification, CCA | Collision avoidance-based priority mechanism by using one time CCA |
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| Priority-based service differentiation scheme [41] | CW | Contention Windows Differentiation (CWD) mechanism is proposed |
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| MAC protocol implementation [42] | Superframe order (SO) | Conduct a study by applying different values of superframe order (SO); results show that high values of SO provide high throughput, whereas low SO values result in less delay |
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| Performance evaluation with backoff [43, 44] | BE | Propose an Adaptive Backoff Exponent (ABE) mechanism which reduces the devices probability to reduce collisions |
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| Comprehensive simulation study for CSMA/CA [45] | BE | Higher values of macMinBE and macMaxBE lead towards higher packet delivery ratios; however, the delay will be increased as well |
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