Table 3.
Comparison between different energy efficient MAC protocols.
| PROTOCOLS | MAC OPERATION | ADVANTAGES | DISADVANTAGES | COMMENTS |
|---|---|---|---|---|
| BodyMAC [44] | TDMA | Flexible bandwidth allocation. Nodes and gateway synchronized allowing sleep mode. Good for periodic data sensing and event reporting. | Unsuitable scheme for collision avoidance. | Star topology and MICAz mote specification are used. |
| MEDMAC [45] | ADAPTIVE TDMA | Maximize energy efficiency through dynamical adjustments for QoS requirements. Good for low rate (Class 0) and medium data rate (Class 1) medical applications. | Low performance for high data rate applications. | Star topology. TDMA synchronization. Energy efficiency optimized by dynamically adjusting QoS requirements. |
| NEW IMPROVED LEACH [43] | TDMA/ Clustering | Distributed protocol, control information from the base station is not required. MD node is introduced to allow sleep mode periodically. | Extra overhead for dynamic clustering. | A clustering topology is used. Efficiency is increased 50% than LEACH protocol. |
| POWER EFFICIENT MAC [46] | TDMA/superframe enabled | Better performance in energy saving and delay compared to WiseMAC, ZigBee, B-MAC, and X-MAC protocols Wakeup mechanism enabled to reduce energy consumption with sleep mode. | No existing evaluation for security and QoS parameters. Nodes must wake up to receive the beacon. | Network lifetime is increased thanks to an overhead reduction. Two priorities for traffic: periodic or normal, and random or emergency. |
| HIGHLY RELIABLE ENERGY-SAVING MAC [20] | Distributed Queuing Body Area Network. Superframe is proposed | Qos parameters are considered. A Cross-layer fuzzy logic scheduler is used. By using Energy-aware radio-activation policies, sensors transmit at lowest possible level specified in 802.15.4. | Nodes must wake up to receive the beacon. | Star topology for BSN under two different realistic hospital scenarios. Matlab simulations are carried out using the CC2420 transmitter-receiver. |
| EQ-MAC [47] | Hybrid TDMA and CSMA schemes | Efficient node’s battery usage and support for QoS based on the service differentiation concept (data prioritization traffic levels). | Data redundancy in the sensor network. Low performance for low data rates. High latency without traffic prioritization. | Sensor Simulator is used for large-scale networks. EQ-MAC outperforms Q-MAC and S-MAC protocols. |