Arrangement for synchronizing access points in WLAN using...

Multiplex communications – Communication over free space – Combining or distributing information via time channels

Reexamination Certificate

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C370S323000, C370S333000

Reexamination Certificate

active

07656855

ABSTRACT:
An arrangement for providing synchronization between a number of overlapping area access points within a wireless LAN utilizes a Power over Ethernet (PoE) cable connection to transmit synchronization signals from a centralized hub/switch to each of the access points connected to the cable. The synchronization signal takes the form of a direct sequence spread spectrum (DS-SS) signal that is coupled onto the twisted pair used to provide the low voltage PoE signal to various powered devices. At each access point, a filter is used to remove the synchronization signal from the PoE transport, allowing for the group of access points to share a common beacon signal and allow for frequency re-use among the access points. The DS-SS signal is preferable created by a combination of a baseband signal and a set of separate pseudo noise (PN) sequences defining a precision phase (“pilot tone”) signal, a time mark (superframe/beacon) signal, and a time-of-day (real-time clock) signal.

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Fahd, K.; Al-Bin-Ali; Prasad Boddupalli; Nigel Davies; “An Inter-Access Point Handoff Mechanism for Wireless Network Management: The Sabino System”, Jun. 2003.
Computer Science Department, University of Arizona, Tucson, Arizona USA and Computing Department, Lancaster University, Lancaster England, Jun. 2003.

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