Profile of Shaykh ul Islam Dr Tahir ul Qadri, one of the greatest scholar of this century. Definitely Mujaddid of this century.
Descripción completa
UL standard for industrial panel building.Full description
Descripción: UL-142 , 2002
UL-142 , 2002Full description
Full description
Full description
Full description
UMTS UL Interference E. Eter
Possible Causes for UL interference
Too high UL RSSI (>-100 dbm) can be caused by:
External sources of uplink interference Inter-mod product Incorrect plumbing Parameter TMA ulGain setting does not match the real TMA gain Faulty devices along the Rx path Loose Connectors Tight Cable Bends
High UL RSSI caused by external interference has significant impact on UL capacity and coverage of a cell.
2
UL RTWP (Ericsson) Antenna
UL RSSI pmAverageRSSI is measured in the RU power sensor. The result is translated to dBm at the Rx reference point by the factor K_dBM. K_dBm = (RUG – FUG) + FAtt – TMAG
Rx Reference Point
Where, FAtt is the Attenuation antenna feeder cable and TMAG is the TMA Total Gain RUG and FUG are internal to the NodeB
TMA
TMAG FAtt
NodeB K_dBm
FUG
FU
RUG
RU RU
Feeder attenuation and TMA Gain are provided by site configuration. So it’s important the loss FAtt and gain TMAG are accurate.
Power Sensor
pmAverageRSSI
Next 3 slides show how to input the TMA gain and feeder attenuation In the OSS element manager
3
TMA Gain
4
Feeder Attenuation and delays
5
Feeder Attenuation and delays
6
pmAverageRssi
7
Ericsson Uplink RSSI Measurement pmAverageRssi UL RSSI counter can be checked through either RBS Performance Statistics counter pmAverageRssi. It can be read by Business Object or Prospect.
8
UL Interference Monitoring A macro was developed to graph ( see figure below) and flag any cell that has a RTWP at least 2dB greater or less than the mean RTWP for all cells in a given RNC. A daily summary for the worst performing sectors will be available on NetTrack (Ericsson and Lucent ). Ericsson Measured Interference 40000
30000 25000 20000
CNU3007A
15000 10000 5000 0
-1 < 08 11 0 . -1 5..- dB 06 10 m . -1 5..- 8 dB 04 10 m . -1 5..- 6 dB 02 10 m . -1 5..- 4 dB 00 10 m .5 2 . d -9 .- 10 Bm 8. 0 5 d -9 ..-9 Bm 6. 8 5 d -9 ..-9 Bm 4. 6 5 d -9 ..-9 Bm 2. 4 5 d -9 ..-9 Bm 0. 2 5 d -8 ..-9 Bm 8. 0 5 d -8 ..-8 Bm 6. 8 5 d -8 ..-8 Bm 4. 6 5 d -8 ..-8 Bm 2. 4 5 d -8 ..-8 Bm 0. 2 5. d .-8 Bm 0 dB m
Number of Samples
35000
Signal Level
9
How to identify the cause of high UL RSSI In case one or two sectors of a site has high UL RSSI
Antenna
Rx Reference Point
Swap antenna feeders between good and bad sectors on RBS cabinet top.
A
TMA
Wait for the next ROP and check the UL RSSI. NodeB
If the high interference stays with the antenna: - then it may be external interference or TMA (A) - otherwise check the FU/RU. (B)
FU
B
Use spectrum analyzer to detect external interference sources Too low UL RSSI (<-110 dbm) will cause PRACH preamble detection problem because UE uses too low power to access the site. It may also cause UL synch loss drop call if the initial power of the Radio Link is too low during handover.
10
RU RU Power Sensor
pmAverageRSSI
LUCENT Uplink RSSI Measurement RTWP VS.RF.Rtwp.LE110 to VS.RF.Rtwp.GT90 Description • The measurement provides a distribution of the Received Total Wideband Power(RTWP) within the granularity period. • The RTWP provides separate counters on a 1dB step size in the typical range used for detailed evaluation. This range is -110 dBm to 90 dBm. • Trigger condition For every 100 ms sampling period the mean RTWP value for the sampling period will be calculated and the appropriate counter incremented. The ranges are defined as listed: 11
LUCENT 1. TMA equipped and controlled by the Node B 2. No TMA equipped
12
TMA equipped Node B The reference point for RTWP is at the TMA input port (antenna side of the TMA). For this configuration RTWP is computed by adding the Rx Path Gain (consisting of the Node B's internal path gain plus the external path gain) to the RSSI measured at the radio's receiver. The external path gain (between the reference point and the Node B's External Antenna Connector (EAC)) is the combination of the Rx Gain data contained in the associated TTLNA Descriptor plus that contained in the Antenna Path Descriptor. RTWP reference point
TTLNA
Feeder Cable
Filter panel
Filter panel attenuator
Cable to Radio
824 MHz
Total Gain (dB)
12.00
-3.00
-0.15
30.50 13
-8.00
-0.70
30.65
No TMA equipped NodeB The reference point for RTWP is the Node B's External Antenna Connector (EAC). In this case RTWP is computed by adding the RSSI measured at the radio to the Node B's internal path gain. The Antenna Path Descriptor's Rx Gain parameters are set to zero.
RTWP reference point
_
LNA
Variable Attenuator
1:3 Splitter
Cable to radio
Total NodeB Filter
Gain (dB)
38.00
-3.00
-7.00 14
-1.60
26.40
Other Cases • There are variants of the "TMA equipped but NOT controlled by the Node B" scenario described in Configuration 2, above. For example, there are certain RxAIT configurations in Cingular's network where RxAIT is equipped without the presence of TMA. In some cases the RxAIT components appear to the Node B as the equivalent of a TMA in the external path. Similarly, there are configurations where the Nokia GSM base station hosts the Rx path. For this case the path through the host GSM base station and antenna system appears as a TMA equivalent.