• ertPS
• Power Saving
• Sleep Mode
• VoIP
• WiMAX

WiMAX is the industry name given to the IEEE 802.16 standard, which provides fixed and mobile broadband wireless access in metropolitan areas.
In spite of the growing popularity of data services, voice services still remain the most requested, especially when mobility is concerned.
Mobile terminals are typically powered by rechargeable batteries with limited ca-pacity, hence the necessity to develop efficient power-saving mechanisms to im-prove the life span of the terminals.
The contribution of the present study is twofold. First, we design an energy-efficient scheduler for IEEE 802.16 connections using the enhanced real-time poll-ing service (ertPS) scheduling service, which is mostly intended for Voice over IP (VoIP) services. Then, we provide a detailed investigation of the performance of our contributed algorithm in terms of power saving and application metrics. The results show that the proposed algorithm is best fit to be used for VoIP traffic, rather than UGS and rtPS and that QoS requirements can be achieved even when a large amount of energy is saved.