01_PWAV Repeater Basic Jul2008
-
Upload
udithanavod -
Category
Documents
-
view
214 -
download
0
Transcript of 01_PWAV Repeater Basic Jul2008
-
7/27/2019 01_PWAV Repeater Basic Jul2008
1/35
-
7/27/2019 01_PWAV Repeater Basic Jul2008
2/35
Xxxxx - 2
Bi-directional Amplifier Amplifies and transmits signals in both directions
-
7/27/2019 01_PWAV Repeater Basic Jul2008
3/35
-
7/27/2019 01_PWAV Repeater Basic Jul2008
4/35
Xxxxx - 4
Basic Repeater Application
-
7/27/2019 01_PWAV Repeater Basic Jul2008
5/35
Xxxxx - 5
Basic Repeater Application
-Off Air application
Rep.
-
7/27/2019 01_PWAV Repeater Basic Jul2008
6/35
Xxxxx - 6
Basic Repeater Application-Fibre optic application 1
RepeaterMaster
Unit: (RMU)
-
7/27/2019 01_PWAV Repeater Basic Jul2008
7/35
Xxxxx - 7
Basic Repeater Application
-Fibre optic application 2
RepeaterMaster
Unit: (RMU)
-
7/27/2019 01_PWAV Repeater Basic Jul2008
8/35
Xxxxx - 8
Eliminate Coverage Holes
-
7/27/2019 01_PWAV Repeater Basic Jul2008
9/35
Xxxxx - 9
Eliminate Coverage Holes Cont.
-
7/27/2019 01_PWAV Repeater Basic Jul2008
10/35
Xxxxx - 10
Hybrid Networks Continue
-
7/27/2019 01_PWAV Repeater Basic Jul2008
11/35
Xxxxx - 11
Distributed System
Difficulties getting space where you want to putyour BTS
The repeater can be put outdoors
No need for Air Conditioned room
Small space
Remote operation and maintenance
Distribute capacity to several locations
-
7/27/2019 01_PWAV Repeater Basic Jul2008
12/35
-
7/27/2019 01_PWAV Repeater Basic Jul2008
13/35
Xxxxx - 13
Distribution of Capacity
-
7/27/2019 01_PWAV Repeater Basic Jul2008
14/35
-
7/27/2019 01_PWAV Repeater Basic Jul2008
15/35
Xxxxx - 15
Centralized
-
7/27/2019 01_PWAV Repeater Basic Jul2008
16/35
Xxxxx - 16
Conclusion, Trunking Gain
De-Centralized Centralized
( BTS solution ) ( Repeater solution )Erlang required 32E 32ENo. of TCH required 59 41No. of TRX required 12 6No. of BCCH+SDCCH required 9 3
No. of TCH available 87 45
i.e. Trunking gain achieved with a repeater solution
-
7/27/2019 01_PWAV Repeater Basic Jul2008
17/35
Xxxxx - 17
Target Areas
-
7/27/2019 01_PWAV Repeater Basic Jul2008
18/35
Xxxxx - 18
Modular design enables easy upgrading and services
Easy upgrading from 2 to 8 carriers for GSM/EDGE and to4 carriers for CDMA/WCDMA
Separate power amplifiers for uplink and downlink
Remote control via wireless and/or wired line modem
Automatic supervision of the antenna isolation
MTBF > 50 000 hours
Features of Powerwave Repeaters
-
7/27/2019 01_PWAV Repeater Basic Jul2008
19/35
Xxxxx - 19
Antenna Isolation
Gain
Feedback oscillation / antenna isolation
Maximum output power / minimum input power
Noise /interference level in the system
Number of donor channels
Timing
Delay spread
Timing advance
Site Design Considerations
-
7/27/2019 01_PWAV Repeater Basic Jul2008
20/35
Xxxxx - 20
Antenna Isolation
-
7/27/2019 01_PWAV Repeater Basic Jul2008
21/35
Xxxxx - 21
Antenna Isolation Cont.
-
7/27/2019 01_PWAV Repeater Basic Jul2008
22/35
Xxxxx - 22
Antenna Isolation Cont.
-
7/27/2019 01_PWAV Repeater Basic Jul2008
23/35
Xxxxx - 23
Choice of donor-site !
High front to back ratio !
Antenna Isolation Cont.
-
7/27/2019 01_PWAV Repeater Basic Jul2008
24/35
Xxxxx - 24
At least Gain of repeater + 10dB (margin)*
Achieved by :
Right choice of antennas
- Opening angle
- Front to back ratio Right choice of donor BTS (direction)
Right placement of antennas (vertical spacing)
*13dB for channel-selective repeater
Antenna Isolation (Summary)
-
7/27/2019 01_PWAV Repeater Basic Jul2008
25/35
Xxxxx - 25
EDoPL
-
7/27/2019 01_PWAV Repeater Basic Jul2008
26/35
Xxxxx - 26
Off air repeater gain setting concern
Antenna Isolation
Gain < isolation - 10dB
Repeater max. output power DL Gain < rated repeater max. output repeater input
Repeater uplink noise
UL Gain < EDoPL 10dB
-
7/27/2019 01_PWAV Repeater Basic Jul2008
27/35
Xxxxx - 27
Antenna Isolation Supervision
(GSM Channel-Selective)
-
7/27/2019 01_PWAV Repeater Basic Jul2008
28/35
Xxxxx - 28
Gain and Noise
-
7/27/2019 01_PWAV Repeater Basic Jul2008
29/35
Xxxxx - 29
Gain should be less than repeater max. output power minusrepeater input
If the amplifier is saturated, AGC should reduce the repeatergain. Otherwise the repeater will perform very badly interms of distortion and thus generates unwanted IM.
(In the case of CDMAOne, the power level of pilot signal is1/5 of the max. total channel power. For example, if only
the pilot is present during installation, the repeater downlinkgain should be set to at most: max. repeater output power repeater input 7dB)
DL Gain and Noise
-
7/27/2019 01_PWAV Repeater Basic Jul2008
30/35
Xxxxx - 30
UL Gain, EDoPL and Noise
-
7/27/2019 01_PWAV Repeater Basic Jul2008
31/35
-
7/27/2019 01_PWAV Repeater Basic Jul2008
32/35
-
7/27/2019 01_PWAV Repeater Basic Jul2008
33/35
Xxxxx - 33
The GOS will be drastically reduced in the repeatercovered area if not all the carriers in the donor cell are
repeated. It is thus important that all the carriers in thecell has the same coverage.
Number of Donor Carriers
-
7/27/2019 01_PWAV Repeater Basic Jul2008
34/35
Xxxxx - 34
Delay spread (time dispersion) must be less than 15 s for aGSM system. Placing the repeater between the donor BTS
and the area to be covered satisfies this requirement. CDMAsystems are in general more robust to delay spread.
For GSM, the timing advance has a maximum limiting thedistance between the BTS and the mobile to 35 km.Introducing a repeater reduces this maximum distance 1.5km to 33.5 km (normally not significant).
Timing Considerations
-
7/27/2019 01_PWAV Repeater Basic Jul2008
35/35