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| Year | Author and reference details | Proposed MAC protocol | Metric used for evaluating the performance | Hops count | Bullet points | Future research directions |
|
| 2011 | Eu et al. [108] | PP-MAC | Throughput, fairness, and interarrival times | Single hop | (i) A new MAC protocol has been presented for EH-WSNs which is known as probabilistic polling MAC. | (i) Future research directions may consider the work towards developing and evaluating the MAC protocol for multihop scenarios. |
| (ii) The proposed framework considers the unpredictable behavior of the energy harvesting mechanism for achieving optimal performance. |
| Fujii and Seah [109] | MTPP-MAC | Scalability, throughput, and fairness | Multihop | (i) A new MAC protocol has been presented for EH-WSNs which is known as multitier probabilistic polling MAC. | (i) Future research directions may consider the work towards considering other energy harvesting environments since the current proposed scheme utilizes the solar energy harvesting environment. |
| (ii) The proposed framework utilizes the multitier probabilistic polling scheme for optimal delivery of data in EH-WSNs. |
|
| 2016 | Nguyen et al. [110] | RF-AASP | Energy efficiency, delay, and throughput | Single hop | (i) A new MAC protocol has been presented for EH-WSNs which is known as RF-adaptive active sleep period MAC. | (i) Future research directions may consider the work towards considering other energy harvesting environments since the current proposed scheme utilizes the RF energy harvesting environment. |
| (ii) The proposed framework reduces the network contention level and enhances the harvested energy thereby achieving energy efficiency. |
|
| 2017 | Al-Sulaifanie et al. [111] | AH-MAC | Energy consumption, nodes alive, delivery ratio, and normalized performance metrics | Multihop | (i) A new MAC protocol has been presented for EH-WSNs which is known as adaptive hierarchical MAC. | (i) Future research directions may consider the work towards considering other energy harvesting environments since the current proposed scheme utilizes the solar energy harvesting environment. |
| (ii) The proposed framework utilizes the cross-layer optimization for dense and low rate WSN. |
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