Abstract
This paper evaluates the performance of a burst transmission mechanism using microsleep operation to support high energy efficiency in IEEE 802.11 Wireless Local Area Networks (WLANs). This mechanism is an implementation of the IEEE 802.11ac Transmission Opportunity Power Save Mode (TXOP PSM). A device using the TXOP PSM-based mechanism can switch to a low-power sleep state for the time that another device transmits a burst of data frames to a third one. This operation is called microsleep and its feasibility strongly depends on the time and energy consumption that a device incurs in the transitions from and to the sleep state. This paper accounts for the impact of these transitions in the derivation of an analytical model to calculate the energy efficiency of the TXOP PSM-based mechanism under network saturation. Results obtained show that the impact of the transition requirements on the feasibility of microsleep operation can be significant depending on the selected system parameters, although it can be reduced by using burst transmissions. When microsleep operation is feasible, the TXOP PSM-based mechanism can improve the energy efficiency of other legacy mechanisms by up to 424% under high traffic loads.
Highlights
The IEEE 802.11 Wireless Local Area Network (WLAN) technology, popularly known as Wi-Fi, is one of the primary means for users to connect to the Internet [1]
It is worth noting that the results of energy efficiency of the evaluated mechanisms as a function of the traffic load, MAC Service Data Unit (MSDU) length, and PHY data transmission rate were presented in [20]
The reason is that the Access Point (AP) and the STAs can send up to three data frames in each channel access opportunity, enabling the reduction of the overall channel access overhead
Summary
The IEEE 802.11 Wireless Local Area Network (WLAN) technology, popularly known as Wi-Fi, is one of the primary means for users to connect to the Internet [1]. Such waiting periods of high energy waste in which data are sent to other STAs can be exploited to allow an STA to enter the sleep state, avoiding overhearing This operation is called microsleep as it enables sleep periods in the order of tens, hundreds, or even thousands of microseconds. Microsleep operation can be combined with power save mechanisms designed for low traffic loads [14], such as PSM and APSD, to provide the highest STA energy efficiency across all possible traffic loads. In order to determine how the aforementioned system parameters can influence the feasibility of microsleep, this paper evaluates the performance of a TXOP PSM-based mechanism using burst transmissions.
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