The wireless sensor network (WSN) is one new hot spot for both research and industry. However, the energy problem has been becoming a challenge in practical applications for WSN because the sensor nodes are supplied with energy by batteries which are difficult to be recharged and replaced. So many researches are taken on reducing the energy consumption of WSN nodes. Medium Access Control (MAC) layer in WSN protocols has a significant effect on the energy consumption. IEEE 802.15.4 is a common used protocol in WSN which was designed for low-cost and low-power wireless network providing MAC layer and physical layer specification. In this paper, the energy consumption in IEEE 802.15.4 together with several other MACs is simulated based on NS-2 simulator. According to the simulation results, performance is analyzed for different MAC protocols. What's more, the transmission delay is very important for the WSN, so the transmission delay is also simulated and analyzed in this paper.
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