Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2006-08-16
2010-02-02
Moore, Ian N (Department: 2463)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
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.
Ghassemzadeh Saeed S.
Miller II Robert Raymond
Murray John F.
AT&T Intellectual Property II, LP
Brown Stephen W
Moore Ian N
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