Performance Analysis of Improved IEEE 802.11 Infrastructure Power Saving Under Time-Correlated Channel Errors.

International Journal of Wireless Information Networks 03/2008; 15(1):36-42. DOI: 10.1007/s10776-008-0071-z
Source: DBLP


Wireless enabled portable devices must operate with the highest possible energy efficiency while still maintaining a minimum
level and quality of service to meet the user’s expectations. In this paper we analyse the performance of a new pointer-based
medium access control protocol that was designed to significantly improve the energy efficiency of user terminals in wireless
local area networks. The new protocol, pointer controlled slot allocation and resynchronisation (PCSAR) protocol is based
on the existing IEEE 802.11 point coordination function (PCF) standard. PCSAR reduces energy consumption by removing the need
for power saving stations to remain awake and listen to the channel. Using OPNET, simulations were performed to compare the
performance of PCSAR with the infrastructure power saving mode of IEEE 802.11, PCF-PS. The simulation results demonstrate
a significant improvement in energy efficiency without significant reduction in performance when using PCSAR. For a wireless
network consisting of an access point and eight stations in power saving mode, the energy saving was up to 28% while using
PCSAR instead of PCF-PS, depending upon frame error rate and channel loading. The results also show that PCSAR offers significantly
reduced uplink (UL) access delay over PCF-PS while modestly improving UL throughput.

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    ABSTRACT: The IEEE 802.11 standard defines a power management algorithm for wireless LAN. In the power management for Independent Basic Service Set (IBSS), time is divided into Beacon Intervals (BIs) and each BI is divided into an Announcement Traffic Indication Message (ATIM) window and a data window. The stations that have successfully transmitted an ATIM frame within the ATIM window compete to transmit data frames in the rest of the BI. This paper analyzes the performance of the IEEE 802.11 Power Save Mode (PSM) in single hop ad hoc networks using a discrete-time Markov chain for a data frame transmission together with the corresponding ATIM frame transmission. The paper presents an analytical model to compute the throughput, average delay and power consumption in IEEE 802.11 IBSS in PSM under ideal channel and saturation conditions. The impact of network size on the throughput, delay and power consumption of the IEEE 802.11 DCF in Power Save Mode is also analyzed. This can be used to find an efficient scheme that can maximize the network throughput while saving power consumption for resource constrained ad hoc wireless networks. The analytical work is validated with simulation results obtained from Qualnet 5.0.1 network simulator.
    No preview · Article · Jan 2013 · Ad Hoc Networks