Product Description

Product Description
34 (98) © Nokia Corporation Draft DN991444
Nokia Proprietary and Confidential Issue 3-0 en Draft
Figure 8 shows schematically the coverage areas created with a BTS that has four
sectors (two GSM/EDGE 900 sectors and two GSM/EDGE 1800 sectors) in a
(1+1)/(1+1) configuration. In Figure 8 , one GSM/EDGE 900 and one
GSM/EDGE 1800 sector are connected to each antenna. The antennas are
directed to different directions.
Figure 8. (1+1)/(1+1) dual band configuration
The 2+2 dual band configuration can be used to build one directional dual band
coverage area. This configuration has one GSM/EDGE 900 sector which includes
two TRXs, and one GSM/EDGE 1800 sector also including two TRXs. One TRX
from the GSM/EDGE 900 sector and one TRX from the GSM/EDGE 1800 sector
are connected to one antenna. The antennas are directed to the same direction.
Consequently, the coverage area comprises four TRXs (two GSM/EDGE 900 and
two GSM/EDGE 1800 TRXs). Diversity can also be utilised in this type of
configuration. Figure 9 shows schematically the coverage area built in this
manner.
- (1+1)/(1+1)
TRXs
- Dual band
- No diversity
BTS
Coverage pattern
(principle)
DIV
OUT
DIV
IN
DIV
IN
DIV
OUT
DIV
OUT
DIV
OUT
DIV
IN
DIV
IN
T
R
X
4
T
R
X
3
T
R
X
2
T
R
X
1
BTS configuration
GSM/EDGE 900 =
GSM/EDGE 1800 =
Dual band =
Antennas directed to form twocoverage areas
1 GSM/EDGE 900 TRX + 1 GSM/EDGE 1800 TRX
in each coverage area