Collision control extended pattern medium access protocol in wireless sensor network

Wireless Sensor Network (WSN) has emerged as a system composed of numerous sensor nodes to collect information, process and deliver the data to the central sink. Existing protocols like Sensor-MAC (SMAC) and Pattern MAC (PMAC) reduces energy consumption from collision, overhearing, control packet overhead and idle listening. Collision is one of the main sources of energy wastage. In pattern MAC protocol, the span of time slot TE in Pattern Exchange Time Frame (PETF) is long enough to broadcast the pattern. A large contention window at the beginning of each PETF time slot is to avoid collision. However, if longer PETF is used, the over head and delay will be more. Hence, the proposed algorithm balances collision and delay. A collision controlled parameter alpha is introduced to compromise delay and collision. From the results, it is observed that, 2.3% of energy is saved.