w(level3) wcdma rnp antenna isolation analysis (umts gsm) 20041217 a 1[1].0
Post on 04-Jun-2018
222 Views
Preview:
TRANSCRIPT
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
1/29
Antenna Isolation Analysis (UMTS-GSM)
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
2/29
Course Contents
Scenario Classification
Interference Analysis
Interference Test
Antenna Isolation Test
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
3/29
Co-Existence
Definition: Co-existence is that UMTS sites and GSM sites
are in the same geographical area, but not co-located.
Cell radius = 0.333 m
1000m
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
4/29
Disadvantage of Co-Existence
Antenna may shooting at each other, the victimcells will reduce a lot on both capacity and coverage,
or even is blocked if the interference is strong
enough.
Worst case: macro -> micro, dead zone happens
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
5/29
Co-Siting
Definition: Co-siting is that both UMTS and GSM
sites are co-located in the same place.
For 2G mobile network operator, Co-siting is the
most popular way to build UMTS network.
Cell radius = 0.333 m
1000m
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
6/29
Advantage of Co-Siting
Operator may reuse the resources of old sites and
reduce the cost for building UMTS network;
Operator can reuse the GSM drive test (DT), consult
the previous optimization results and take as areference to UMTS (for example: BCCH signal
distribution);
Co-siting can reduce near-far effect, because path
loss to both UMTS and GSM are always equal and
dead zone are less likely.
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
7/29
Course Contents
Scenario Classification
Interference Analysis
Interference Test
Antenna Isolation Test
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
8/29
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
9/29
3GPP and GSM Specification
WCDMA Base Station (BS )Spurious Emission (SE):Band Max Level/ Measurement Bandwidth (BW)
30~1000MHz 876~915MHz-98dBm/100KHz
921~960MHz-57dBm/100KHz
Others -36dBm/100KHz
1000~2100MHz 1710~1785MHz-98dBm/100KHz
1805~1880MHz-47dBm/100KHz
1893.5~1919.6MHz-41dBm/300KHz
1900~1920MHz-86dBm/MHz
1920~1980MHz-96dBm/100KHz
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
10/29
BS accepted noise calculation:
BG_Noise = KTW + NF,
K: Boltzmann constant; T: temperatures in degrees, Kelvin;
W: receiver BW; NF: 3 dB;
KT= -174dBm/Hz, BG_Noise= -105dBm/3.84MHz
A typical accepted sensitivity degradation level of radiosystem is less than 0.4 dB. Based on the above BG_Noise
value, the extra interference signal should be less than -115
dBm/3.84MHz.
WCDMA BS Accepted Noise
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
11/29
GSM BSSE:In GSM 05.05 specification, the limitation for GSM900 and
DCS1800 SE of UMTS band is very low, only 30dBm/3MHz
Bands Maxi Level/ Measurement BW
9KHz1GHz 36dBm/3MHz
112.75GHz 30dBm/3MHz
3GPP and GSM Specification
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
12/29
BS allowed noise calculation:
BG_Noise= KTW + NF
K: Boltzmann constant, KT=174dBm/Hz;
T: temperature in degrees Kelvin;
W: receiver BW;
NF: noise figure of BS, 3 dB;
BG_Noise=118dBm/200kHz.
A typical allowed sensitivity degradation level of radio
system: < 0.4 dB. From above BG_Noise value, extra
interference signal should be:
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
13/29
Interference Investigation for Co-siting
For co-siting scenario, the interference situation needs to
be investigated based on the Tx/Rx antenna scenario.
GSM Tx interferences UMTS Rx
UMTS Tx interferences GSM Rx
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
14/29
Interference: GSM to UMTS
Case of directional antenna
NodeB accepted noise: 100m (H), and > 4m (H), not practical
Note: H - horizontal
Actually, RF performance of GSM equipment is vendors
dependent and normally is much better than that from GSM
specification. For example, normally for GSM900 BTS, in order to
co-located with DCS1800, extra attenuation will be achieved in
DCS1800 band, close to UMTS band.
Huawei DCS1800 BTS, SE in UMTS band:
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
16/29
Interference: UMTS to GSM
For GSM, BTS accepted noise is less than -128 dBm.The max GSM SE leaked in 900 and 1800 band is
- 98dBm/100KHz (- 95dBm/200KHz). Thus the isolation
between UMTS Tx and GSM Rx antenna is:
- 95dBm( - 128dBm) = 33dB.
In this scenario, the average space distance between
two antennas is less than 1m for horizontal, and less
than 0.2m for vertical.
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
17/29
Course Contents
Scenario Classification
Interference Analysis
Interference Test
Antenna Isolation Test
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
18/29
Interference Test
The isolation is relatively hard to achieve when twosystem co-located from theoretical calculation. This
result is too pessimistic.
In practice, RF performance of BS equipment is
vendors dependent and normally is much better than
that from UMTS and GSM specification.
Interference test helps in evaluating the antenna
isolation among different wireless systems.
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
19/29
GSM Spurious Emission Test
WCDMAGSM
GSM BTS
GSM and
WCDMA
Diplexer
WCDMA
BPF
Antenna or
Dummy
Load
Spectrum
Analyzer
Agilent
E4445
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
20/29
Test Equipments and Accessories
Items Note Amount
Spectrum Analyzer Agilent E4445Awith LNAoption
1
WCDMA BPF LGP145 1
WCDMA/GSM900
Diplexer
LGP135 or Kathrein 782
10250
1
WCDMA/DCS1800
Diplexer
LGP145 or Kathrein 782
10243
1
Dummy Load RF power >100W 1RF Cable 4
Adaptor DIN (male)/N (female) 6
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
21/29
Test Process
Agilent E4445A Settings:
Frequency band1920 ~1980 MHzRBW100KHzVBW300KHzAverage
On
Average times: 20
LNA Status: On
Steps1) Set up the test system
2) Adjust GSM BTS output power to max value
3) Record the spurious power value using Peak-Search
function
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
22/29
Course Contents
Scenario Classification
Interference Analysis
Interference Test
Antenna Isolation Test
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
23/29
Test Condition
Testing under two cases with cross polarization (CXP)
antennas:
Case 1: UMTS and GSM900 , Case 2: UMTS and DCS1800
Two 9m 1/2 cables are used in this test and each cables loss is
regarded as 1dB in GSM900 band and 2dB in DCS1800 and UMTS bands.
The isolation data in this test is processed so that the cable loss isexcluded.
The antenna ports are selected so that Tx and Rx antenna have the same
polarization.
The antennas are installed 8m above ground and are directed toward the
same direction.
Bands Vendor Type Gain HBW VBW
GSM900 JB 7600 17dBi 60 9
DCS1800 JB 5022004 18dBi 60 5.5
UMTS MAT 5162100
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
24/29
Test Configurations
Spectrum
Analyzer
HP8594E
UMTS
Antenna
GSM
Antenna
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
25/29
Test Equipments and Accessories
Items Note Amount
Spectrum Analyzer Agilent E4445A 1
Signal Generator Max output power
>10dBm
Frequency band:
900 KHz ~ 2 GHz
CW output
1
Test Cable 3m 2
Antennas GSM, UMTS 2
Adaptor DIN (male)/N( female) 4
Matching Load N (male) 2
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
26/29
Test Process
Agilent E4445A settings:
Frequency band19201980 MHzRBW100 KHzVBW300 KHzAverageOnAverage times: 20 (mS)Signal generator settings:
Frequency: 1950 MHz
RF power: 10 dBm
Mode: CW
Steps1) Set up the test system according to figure 1
2) Turn on RF power of signal generator
3) Record the power value of E4445A at 1950MHz
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
27/29
Test Result
Case 1 Antenna Isolation of UMTS and GSM900
890
MHz
902.5
MHz
915
MHz
935
MHz
947.5
MHz
960
MHz
1920
MHz
1950
MHz
1980
MHz
2110
MHz
2140
MHz
2170
MHz
0.
5
m
65d
B68dB
68d
B
71d
B65dB
70d
B55dB 58dB 62dB 49dB 52dB 62dB
1.
0
m
70d
B72dB
73d
B
71d
B71dB
71d
B57dB 61dB 67dB 62dB 66dB 63dB
1.
5
m
72d
B71dB
70d
B
69d
B72dB
72d
B65dB 66dB 68dB 57dB 58dB 60dB
2.
0
m
71d
B73dB
73d
B
69d
B71dB
73d
B71dB 67dB 70dB 58dB 63dB 63dB
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
28/29
Test Result
Case 2 Antenna Isolation of UMTS and DCS1800
1710
MHz
1747.
5MHz
1785
MHz
1805
MHz
1842.
5MHz
1880
MHz
1920
MHz
1950
MHz
1980
MHz
2110
MHz
2140
MHz
2170M
Hz
0.
5
m
63dB 61dB 56dB 62dB 68dB 62dB 51dB 58dB 60dB 66dB 57dB 57dB
1.
0
m
62dB 67dB 66dB 67dB 66dB 62dB 54dB 54dB 68dB 60dB 55dB 58dB
1.
5
m
63dB 66dB 62dB 61dB 60dB 60dB 59dB 59dB 58dB 62dB 66dB 68dB
2.
0
m
70dB 62dB 62dB 67dB 62dB 63dB 60dB 62dB 61dB 66dB 69dB 66dB
-
8/13/2019 W(Level3) WCDMA RNP Antenna Isolation Analysis (UMTS GSM) 20041217 a 1[1].0
29/29
top related