Experiences With WM: A Centralised Scheduling Approach for Performance Management of IEEE 802.11 Wireless LANs

In our earlier work ([1]) we proposed WLAN Manager (or WM) a centralised controller for QoS management of infrastructure WLANs based on the IEEE 802.11 DCF standards. The WM approach is based on queueing and scheduling packets in a device that sits between all traffic flowing between the APs and the wireline LAN, requires no changes to the AP or the STAs, and can be viewed as implementing a "Split-MAC" architecture. The objectives of WM were to manage various TCP performance related issues (such as the throughput "anomaly" when STAs associate with an AP with mixed PHY rates, and upload-download unfairness induced by finite AP buffers), and also to serve as the controller for VoIP admission control and handovers, and for other QoS management measures. In this paper we report our experiences in implementing the proposals in [1]: the insights gained, new control techniques developed, and the effectiveness of the WM approach in managing TCP performance in an infrastructure WLAN. We report results from a hybrid experiment where a physical WM manages actual TCP controlled packet flows between a server and clients, with the WLAN being simulated, and also from a small physical testbed with an actual AP.

Memoirs and sermons of Wm. J. Armstrong / edited by Hollis Read.

http://www.archive.org/details/memoirsandsermon00armsiala

MEMOIR OF THE LIFE, CHARACTER, AND PUBLIC SERVICES OF THE LATE HON. HENRY WM. DE SAUSSURE, PREPARED AND READ ON THE 15th FEBRUARY, 1841, AT THE CIRCULAR CHURCH, CHARLESTON, BY APPOINTMENT OF THE SOUTH CAROLINA BAR ASSOCIATION.

A special meeting of the Association was held as it was resolved that Chancellor Harper was requested to prepare a memoir of the late Chancellor De Saussure.

F. R. Lalor and Wm. Jaques Papers, 1910

F.R. [Francis Ramsey] Lalor (1856-1929) was born in St. Catharines, Ont. but lived most of his life in Dunnville, Haldimand County, Ont. He was a merchant and manufacturer. In 1903 he and a few partners founded the Monarch Knitting Co. Lalor was also an exporter of hardwood ashes used for agricultural purposes as fertilizer. Lalor was active in politics, he was a Conservative and the member of parliament for Haldimand, having been elected in the 1904, 1908, 1911 and 1917 elections. William Jaques lived in Simcoe, Norfolk County, Ontario. He was a junk dealer by profession.

Letter to S.D. Woodruff signed by Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company

Letter (1 page, typed) to S.D. Woodruff asking for the papers for the Crick loan. This is signed by Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company. The letter is torn, has holes in it and is somewhat crumpled and stained. This does not affect the text, June 7, 1887.

Letter to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company

Letter (1 page, typed) to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company requesting the papers for the Crew and Atkins loans. The letter is discoloured along the folds. This does not affect the text, Nov. 20, 1887.

Letter to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company

Letter (1 page, typed) to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company requesting the Dennis loan papers, Jan. 6, 1888.

Letter to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company

Letter to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company to please look for the Maria Cogswell loan papers, Aug. 14, 1888.

Letter to S.D. Woodruff from Wm. Shelley, treasurer of the Jarvis-Conklin Mortgage Trust Company

Letter to S.D. Woodruff which accompanied to check for the Maria Cogswell account. The letter was sent by Wm. Shelley, treasurer of Jarvis-Conklin Mortgage Trust Company, May 25, 1889.

Bill to Mr. R. Nelles from Wm. Atkinson and Co.,

Bill to Mr. R. Nelles from Wm. Atkinson and Co., Importers of Hardware, Hamilton for miscellaneous hardware item. There is a note on the bottom of the invoice from Wm. Atkinson requesting payment, Jan. 1850.