H-MAC: A Hybrid MAC Protocol for Wireless Sensor Networks
In this paper, the authors propose a Hybrid Medium Access Control protocol (H-MAC) for wireless sensor networks. It is based on the IEEE 802.11's Power Saving Mechanism (PSM) and slotted aloha, and utilizes multiple slots dynamically to improve performance. Existing MAC protocols for sensor networks reduce energy consumptions by introducing variation in an active/sleep mechanism. But they may not provide energy efficiency in varying traffic conditions as well as they did not address Quality of Service (QoS) issues. H-MAC, the propose MAC protocol maintains energy efficiency as well as QoS issues like latency, throughput, and channel utilization.