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Overview:

According to employing Power Saving Mode (PSM) scheme or not, stations (STAs) in Wireless Local Area Networks can be classified into two categories: STAs using PSM (PSSTAs) and STAs staying in Active Mode (AM-STAs). In IEEE 802.11 standard, a PS-STA periodically wakes up and retrieves data buffered at the Access Point through contending with both other PS-STAs and AM-STAs for its PS-Poll's transmission. Although AM-STAs usually have no concern with energy, their contention degrades the energy efficiency of PS-STAs, which usually have life concern, by increasing the time duration for data retrieving and increasing the number of PS-STAs which contend throughout the whole beacon interval but get no access opportunity.

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Format:PDFSize:205 KB
Date:Feb 2009
Pages:6

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