SPEED-MAC: Speedy and Energy Efficient Data Delivery MAC Protocol for Real-Time Sensor Network Applications

Collision Free Communication for Energy Saving in Wireless Sensor Networks

“…it provides low latency and it is flexible it can not handle a large multi-hop wireless sensor network and other network topologies Speed MAC [31] divides the cycle time into an event announcement period, and a data transmission period minimizes the message delivery latency and the energy consumption and also distinguishes single-source events from multi-source events no guarantee is given as the congestion can not be predicted. Packet loss.…”

“…The SIGNAL packet contains the sender address Figure 19. Cycle time breakdown in SPEED-MAC [31] and a single bit for collision detection. On wakeup, a node receives the SIGNAL packet only if the sender is one of its children.…”

WirArb: A New MAC Protocol for Time Critical Industrial Wireless Sensor Network Applications

“…Although the aforementioned protocols can reduce the delivery delay by scheduling the sleep slot, they are not designed for deterministic delay guarantee due to random backoff. All these MAC protocols (including but not limited to [13]- [19]) involves the CSMA/CA mechanism being more valuable to protect ordinary wireless sensor networks from packet collisions rather than time-critical Wireless Sensor and Actuator Networks (WSAN) with hard requirements for deterministic delay guarantees. HyMAC [20] is a class of MAC protocols merging TDMA and FDMA together.…”

“…However, this class of protocols involves end-to-end delay due to the sleep period to avoid collision with others. In order to reduce the delay from unnecessary sleep, a wake-up scheduling method such as LEEMAC [16], DMAC [17], DW-MAC [18] or SPEED-MAC [19] is developed to decrease sleeping delay. Although the aforementioned protocols can reduce the delivery delay by scheduling the sleep slot, they are not designed for deterministic delay guarantee due to random backoff.…”

SLACK-MAC: Adaptive MAC Protocol for Low Duty-Cycle Wireless Sensor Networks

“…Several other protocols have been proposed for the same purpose, such as D-MAC [7], DW-MAC [8], Speed-MAC [9], TreeMAC [10], MC-LMAC [11], SEA-MAC [12] and others [13,14,15]. As in IEEE 802.15.4, these protocols generally have three types of periods: a synchronization period, which ensures that all nodes share a common time, a communication period, where nodes can communicate efficiently, and an inactive period, where nodes save energy.…”