Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-03-06
2008-10-21
D'Agosta, Stephen M (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S447000, C455S448000, C455S449000, C455S451000, C455S562100, C343S875000, C342S367000, C342S379000, C342S423000, C342S445000
Reexamination Certificate
active
07440758
ABSTRACT:
Coverage areas for wireless networks are divided into a plurality of cells that are arranged in rows. Channel frequencies are assigned to cell sectors and associated with respective antenna axes. The antenna axes of adjacent rows are alternatingly rotated, thereby reducing co-channel interference. In an example, an available bandwidth is divided into twelve channel frequencies, so that a cell cluster includes four cells. Co-channel cells associated with half the channel frequencies are assigned to cells in the first row of cells, and the remainder are assigned to cells in the second row.
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MacDonald Alan Denis
Zhang Ming
AT&T Mobility II LLC
D'Agosta Stephen M
Donohue Michael J.
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