Table 2.
Energy conserving solutions for wireless local area network-based IoT.
| Category | Solution | Approach | Scheme | Metric | Control | Evaluation |
|---|---|---|---|---|---|---|
| Overload control | [63,96] | Calculated offset listen interval spread among devices | Duty cycling | Energy efficiency | Centralized | Analysis, simulation |
| [64] | Higher channel access priority to low energy level devices | Device power | Energy efficiency | Distributed | Algorithm, simulation | |
| [65] | Frame slotted aloha and tree splitting algorithm based duty cycle synchronization | Duty cycling | Energy efficiency, end-to-end delay | Centralized/Distributed | Analysis, simulation | |
| Power Saving Mode (PSM) optimization | [66,67] | PSM and traffic announcement extension for IEEE 802.11 | Duty cycling | Energy efficiency, end-to-end delay | Distributed | Simulation |
| [68] | Mobility supported PSM | Duty cycling | Energy efficiency, end-to-end delay | Distributed | Simulation | |
| [70] | Schedule-aware PSM | Duty cycling | Energy efficiency | Centralized/Distributed | Analysis, simulation | |
| [69] | IEEE 802.11 android power saving framework extension | Transmit power control | Energy efficiency, end-to-end delay | Distributed | Experimental test bed | |
| [71] | New low power WiFi chip/modules | Transmit power control | Energy efficiency, interference, communication range | Distributed | Real time experiment | |
| Solutions for IEEE 802.11/802.11ah multi-hop communication collision | [72] | Virtual grouping for contending and non-contending STAs | Contention alleviation | Energy efficiency | Distributed | Algorithm, simulation |
| [73] | Performance analysis of IEEE 802.11ah | Transmit power control | Energy efficiency, transmission range, data rate, end-to-end delay | Distributed | Real time experiment | |
| [74] | Packets buffering strategy for TIM and non-TIM devices | Duty cycling | Energy efficiency | Centralized/Distributed | Simulation | |
| [75] | Restricted access window mechanism | Duty cycling | Energy efficiency, throughput, end-to-end delay | Distributed | Analysis, simulation | |
| Energy saving management of heterogeneous radio interfaces | [69] | Low power radio based interface energy management | Duty cycling | Energy efficiency | Centralized/Distributed | Simulation |
| [77] | Middleware based on overlay module for interface management | Duty cycling for devices in overlay network | Energy, end-to-end delay and capacity | Centralized | Simulation | |
| [78] | ZigBee assisted WiFi transmission | Congestion control | Energy efficiency | Centralized | Simulation |