A New Energy Saving Mechanism in IEEE 802.16e/m
نویسندگان
چکیده
To extend lifetime of battery-powered mobile device before its recharging in broadband wireless access networks, power saving mechanism in MAC (medium access control) has become a significant design issue. Basically, a power saving mechanism is manipulated by adjusting operating parameters such as the minimum sleep interval (Tmin) and the maximum sleep interval (Tmax). In this paper, we propose a new energy saving mechanism for IEEE 802.16e/m to get maximized energy saving by dynamically changing sleep interval T based on traffic rate of serving service. The proposed mechanism also tries to minimize overheads transmitted between Mobile Subscriber Station (MSS) and Base Station (BS) by eliminate MOB-SLP-REQ/RSP messages. The value of sleep interval T is chosen by BS instead of MSS in WiMAX 802.16e standard and is sent to an MSS via MOB-TRF-IND message. The MSS only uses constant sleep interval T value in a successive sleep interval sequence until next transaction from awake mode to sleep mode. The new mechanism also does not use MOBSLP-REQ/MOB-SLP-RSP that causes more energy consumption because of staying in waiting stage. This mechanism can be applied for Power Saving Class (PSC) I and PSC II by changing T corresponding delay requirement of service. The analytical results and simulation show that the proposed mechanism gains more than 36% of energy saving in maximized saving mode or 23% in optimized energy saving mode if it keeps response time changed a little in compared with the current standard of sleep mode mechanism.
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