Page 277 - GuideFWA

Tadiran TDD FWA technology ) can not coexist, since DCS is not used. DECT and PWT/PWT(E)
coexist so well, that no efficiency loss occur.

1910-1930MHz
FWA with DCS

Equipment meetingFCC
part 15Disochronous
rules, DECT, etc. having
DCS(Nodanger ill. imports)

1910MHz 1920MHz 1930MHz

DCS, DynamicChannel Selection

1.2.1. Coexistence between Public and Private Systems, all Using DCS

Coexistence between Public and Private Systems, all Using DCS, is no new idea. It is implemented and
proven by both the DECT standard and the PHS standard. The figure below gives a simple example
illustrating this.

A high density DECT base with 6 sector antenna arrangement, could typically radiate the wall of a high
building with 10-15 E average traffic. Half of those will fall in the band 1920 - 1930 MHz. Therefore 5-
10 E has been indicated in the figure.

The Private systems have been designed to cover very large buildings by many rows of cells in three
dimensions. The figure below illustrates that the interference from a nearby FWA DECT base does not
interfere more than an other row of internal cells, which the private system anyhow is designed to
coexist with.

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