TS => traffic stream
TSPEC => traffic specification
TCLAS => traffic classification
APSD => Automatic power save delivery
EDCA Admission Control
Admission control is negotiated by the use of a TSPEC.
A station specifies its traffic flow requirements (data rate, delay bounds, packet size, and others) and requests the AP to create a TSPEC by sending the ADDTS (add TSPEC) management action frame.
If the TSPEC is accepted, the high priority access category inside the STA is permitted to use the high priority access parameters.
Controlled Channel Access
Unscheduled Automatic Power Save Delivery (U-APSD). This is an asynchronous approach to power conservation defined in 802.11, and serves as the basis of WMM Power Save, allowing the client to request queued traffic at any time rather than waiting for the next beacon frame.
Reference:
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-3600-series/white_paper_c11-713103.html
http://www.eetimes.com/document.asp?doc_id=1271987
http://community.arubanetworks.com/aruba/attachments/aruba/tkb%40tkb/37/1/U-APSD%20explained%20and%20debugged_i62_R2.pdf
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