Research Article
Adaptive APSD: A low power scheduling protocol for IEEE 802.11 Wireless LANs
@INPROCEEDINGS{10.1109/COMSWA.2006.1665234, author={Sridhar Ramesh}, title={Adaptive APSD: A low power scheduling protocol for IEEE 802.11 Wireless LANs}, proceedings={1st International ICST Workshop on Wireless Personal and Local Area Networks}, publisher={IEEE}, proceedings_a={WILLOPAN}, year={2006}, month={8}, keywords={}, doi={10.1109/COMSWA.2006.1665234} }- Sridhar Ramesh
Year: 2006
Adaptive APSD: A low power scheduling protocol for IEEE 802.11 Wireless LANs
WILLOPAN
IEEE
DOI: 10.1109/COMSWA.2006.1665234
Abstract
IEEE 802.11e recommends two mechanisms for support of low power operation in handheld and battery operated devices, called scheduled automatic power save delivery (S-APSD) and unscheduled APSD (U-APSD). U-APSD has an advantage under variable bit rate traffic, while S-APSD is more efficient for moderate to heavily loaded networks with predictable traffic. This paper introduces a new scheduling algorithm that combines efficient aggregation and bursting schemes in combination with support for low power devices in a wireless LAN. It consists of two key components; the first is a dynamic scheduling scheme based on embedding the schedule information in downlink frames, and the second is a signaling mechanism used to determine whether legacy APSD mechanisms or dynamic scheduling is to be used. The result is a very flexible scheme-adaptive APSD-that allows the scheduler embedded in the access point (AP) to adaptively switch to the scheduling strategy best suited to the prevailing traffic conditions