Underwater Wireless Sensor Networks: A Review of Recent Issues and Challenges

Table 7

Comparison MCA protocols.

Protocol	Based	Topology	Advantages	Disadvantages
T-Lohi	Contention	Not fixed/Distributed	It is used to solve the space time & uncertain data reservation problem while using short wake up time to reduce energy consumption.	Node is required to be idle and listen to the channel each in contention round.
R-MAC	Contention	Multi-hop	TC & data packets are scheduled to the both sender and receiver side.	There is No technique to join for new nodes when node dies or left.
H-MAC	Hybrid	Centralized	It accepts the benefits from both contentions based &contention-free protocols while low power consumption/energy reservation.	Not Optimal for dense & heavily loaded network.
UWAN-MAC	Hybrid	Dense network	It achieves synchronized locally schedule even when long propagation delay is present because it required small duty cycle.	Difficult to achieve high throughput due to small duty cycle feature.
P-MAC	Hybrid	Centralized	According to information of VDL it works dynamically & adaptively.	The addition of P-MAC with multichannel& ad-hoc mechanisms.
MFAMA	Contention	Mobile UWASN	A greedy approach intends to maximize throughput.	pay compensation to the Fairness.