16 RA4540GEN07GLA1 WCDMA Antenna System Features RU30 Ppt (1)

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WCDMA Antenna System Features

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WCDMA Bias-T description

The Bias-T used in the Nokia Siemens Networks WCDMA Antenna Systems is an integral component of the WCDMA Masthead Amplifier (MHA). There are two versions of Bias-T available: Bias-T with VSWR (voltage standing-wave ratio) and non-VSWR Bias-T.

Bias-T has two primary functions. It provides:

• Power to the Masthead Amplifier by injecting DC power into the RF feeder centre conductor, so separate DC cabling is not needed

• Fault monitoring of the antenna line VSWR (voltage standing-wave ratio) and Masthead Amplifier, forwarding alarm signals to the base station antenna filter unit (WAF)

The Bias-T transfers DC power via the antenna coaxial cable to the MHA connected to the antenna line. The Bias-T combines DC and RF energy onto the same coaxial cable and provides RF isolation toward the DC voltage supply and DC isolation towards the BTS. The BTS TX power is fed through the Bias-T.

The VSWR alarm function indicates that the antenna, MHA, feeders or jumpers have developed problems which impair their functioning. The Bias-T with VSWR can be installed to a WCDMA Antenna System without an MHA as a stand-alone unit to provide lightning protection and VSWR monitoring.

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The Bias-T has lightning suppression built into the unit, as shown in the block diagram

This Bias-T provides lightning protection for the BTS also

There are no user- or operator-serviceable components inside the Bias-T

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Choosing the Antenna → Tune VSWR Threshold menu item opens the Tune VSWR Threshold dialog box, where you can tune VSWR alarm threshold values for antenna filters inside RF modules.

The VSWR treshold tuning is used for defining values when an alarm notification needs to be sent for a minor problem of an antenna line condition (decreased condition) and for a major problem condition (cell blocking).

The VSWR threshold tuning can be also used (indirectly) to find out the actual VSWR value by changing the values and monitoring alarms.

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•Check the antenna for which tuning of VSWR is required.

•Specify Minor and Major Ranges. (VSWR Values from 1.5 to 3.5)

•Start Tuning.

• The Alarms column shows the states of VSWR alarms for each filter.

• When the tuning mode is activated by clicking the Start Tuning button, sending alarms to the NetAct from the selected antenna lines is blocked. Alarms will not be sent until the tuning is stopped by clicking the Stop and Save or Stop without Saving button.

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WCDMA Dual MHA monitoring and alarms

•If the MHA unit fails, a bypass mode ensures that the antenna line sector continues operating

•Alarms are sent to the BTS via the DC feeders so if the power to the MHA is switched off the alarms are switched off

•If MHA power is lost, the MHA no longer amplifies the Rx signal, but the by-pass operation is still able to pass through the Rx path (with minor loss).

•The MHA has an operational current 'window' and providing the current consumed is within this window and within the specified DC voltage range, the MHA operates correctly

•When the monitored MHA current consumption is outside this window, an MHA alarm is activated

•The BTS operating software confirms the alarms and performs a recovery action applicable to the version of BTS operating software being used

•To identify the specific software recovery action, please refer to the BTS Software User Manual for information

•An MHA alarm alerts if the MHA Low Noise Amplifier (LNA) is defective or outside the operational limits

Note

•If open or high impedance exists along the antenna line supplying the MHA DC supply, this indicates a VSWR alarm condition

•If an MHA alarm is activated, the cause of the alarm must be identified

•Once the cause is clearly identified, the appropriate corrective actions can be performed to correct the fault

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•WMHD MicroMHA comprises two identical amplifiers in one compact integrated package which is easy to transport and install

•A state of the art Low Noise amplifier design provides a nominal 12 dB of gain, compensating feeder loss and improving coverage

•In the unlikely event of component or power failure, a bypass path allows the BTS to continue operation

•Power is fed via the feeder cable, in Flexi BTS no BiasTs are needed, WMHD gets it’s power and control directly from BTS

•With Ultrasite WCDMA BTS, the BiasT is needed

•WMHD has also RET connector for remote antenna tilt adjustor, RTA

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The TMA is always installed outside the Node B rack/shelter and close to the antenna, thus achieving fixed sensitivity independently of the feeder cable length.

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•The RET (Remote Electrical Tilt) module is located directly under the antenna and contains a stepper motor which adjusts a phase shift within the antenna

•This module is accessed from a RET capable TMA module (TMARET/DTMARET/SDTMA) via the RS485 interface

•RET specific commands enter the Node B at the Core Controller, are routed through a RET capable DUAMCO (variant DUAMCORET) and are transmitted to the RET module via the RET capable TMA module

•The signals are sent over the HDLC protocol

•In the opposite direction the RET module sends information and alarms

•RET signaling and DC power from the DUAMCO to the TMA and vice versa is transported through the antenna feeder cable; a triplexer is integrated in the TMA to provide these functions

•A special cable is needed between the TMA and the RET module for the RET´s DC voltage and the RS485 interface

The TMA and its variants are powered by the related DUAMCOs (e.g. TMA/DTMA by DUAMCORT and TMARET/DTMARET by DUAMCORET).

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The TMA module consists of

•one duplexer subsystem

•a triplexer

•a low-noise amplifier (LNA) with a fail-safe path and a bias & signaling board

•The transmit path consists of the TX part of the duplex filters

•The receive path consists of the RX part of the duplex filters and contains the LNA

•The triplexer combines the TX and the RX path with the TMA signaling path (e.g. alarms). Therefore only one feeder cable is required between the TMA and the Node B

•The TMA is supplied with +12 V DC through the feeder cable from the Node B

The LNA within the TMA has two parallel gain elements:

•If a single failure occurs, operation continues with reduced gain

•If both gain elements fail, or the supply of the TMA fails, the LNA is bypassed by a fail-safe switch.

The DTMA module consists of

•two RF ports

•a duplexer subsystem

•a triplexer

•an LNA with a fail-safe path and a bias & signaling board

•For each sub-module, signaling and DC power supply are provided through the associated feeder cables from the Node B

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The DTMAF / DTMARETF shall be grounded to the pole, therefore a protective earthing conductor has to be prepared for each device on site.

The mounting plate provides a ground screw with a locking washer attached to it and a threaded hole for connection of the protective earthing conductor (see bottom view of the devices). The protective earthing conductor cable lug must have the right size for the M8 ground screw. The cross section of the protective earthing conductor must be not less than 16 mm2 (AWG 6).

The other end of the protective earthing conductor should be safely connected to a well grounded point on the pole. The DTMAF / DTMARETF shall be grounded to the pole, therefore a protective earthing conductor has to be prepared for each device on site.

The mounting plate provides a ground screw with a locking washer attached to it and a threaded hole for connection

of the protective earthing conductor (see bottom view of the devices). The protective earthing conductor cable

lug must have the right size for the M8 ground screw. The cross section of the protective earthing conductor must

be not less than 16 mm2 (AWG 6).

The other end of the protective earthing conductor should be safely connected to a well grounded point on the pole.

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Care must be taken that the draining pipe (see bottom view of the devices) is pointed downwards. The draining outlet is factory mounted. If it, for any reason, would be loosened, it should be tightened again with a sufficient torque wrench, however not exceeding 2.2 Nm (1.6 ft lb).

The draining pipe must never be obstructed or covered with paint which would impede the venting and draining of the housing.

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If a DTMARETFV4 shall be installed, pay attention to the following special notice of the manufacturer.

The RET male connector must be firmly tightened by means of bare hands only. No tool (e.g. pliers) can be used.

Failure to follow this instruction can cause damage to the RET connector assembly and further, it can cause water intrusion into the unit.

If the RET cable is not connected, the cap provided with the unit must be firmly screwed on the RET female connector on the TMA.

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The hose clips surrounds the pole and are fitted into the corresponding openings of the mounting plate (see rear view of the devices). This is the situation just before tightening the hose clips.

For the mounting, the following steps can be generally recommended. First connect the DTMAF / DTMARETF to the antenna feeder cable. Take into consideration that the antenna feeder often is very stiff and rather heavy. The position of its coaxial connectors therefore often determines the position of the DTMAF / DTMARETF on the pole.

1. Place the DTMAF / DTMARETF in its final mounting position at the pole.

2. Secure the unit with a tensioning belt.

3. Open the hose clips by pressing the “button” at the end of the clip lock and then smoothly pull out the perforated metal band.

4. Move the metal band of the hose clip gently into the openings of the mounting plate.

5. Close the hose clip loosely around the pole.

6. Tighten the hose clip screws carefully, but do not over-tighten.

7. Remove the tensioning belt.

8. Connect the DTMAF / DTMARETF first to the antenna feeder cable (NodeB) and then to the antenna jumper cable (ANT). The torque must be 25 Nm (18.5 ft lb).

9. Connect the protective earthing conductor with the DTMAF / DTMARETF ground screw. Tighten the connection to a torque of 5 Nm (3.7 ft lb).

10. The use of self-vulcanizing tape as an environmental protection of the connectors is recommended.

Pay attention to the thermal dimensional changes of the antenna feeder cables. If the antenna is equipped with a RET module, install the DC power / data cable between the module and the 8 pole circular connector of the DTMARETF. The required cable will be delivered with the RET module together.

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A TMARET unit contains both MHA and RET unit.. Note that only DTMARETFV1, DTMARETFV2, DTMARETFV3, DTMARETFV4, SDTMARETFV1, SDTMARETFV2, SDTMARETFV3 and TMARETFV1 TMARET types can be commissioned in the TMARET Settings page.

Autodetected AISG MHAs are commissioned in the AISG MHA Settings page and autodetected AISG RETs are commissioned in the RET Settings page

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Click the New Unit button to add either a new TMARET or RET unit to the HW configuration.

For a TMARET unit, define the following settings:

TMARET type.

RET in Use

NodeB0 Antenna

NodeB1 Antenna

For a RET unit, define the following settings:

Antennas

Repeat the procedure for each TMARET or RET unit.

Click the Next button.

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Steps

1. Open the Licence Management dialogue on WCDMA BTS Site

Manager.

2. Click the Browse button to open the Browse Licence File

dialogue.

3. Select the Rx Signal Level Monitoring (feature code 1216)

licence.

4. Click the Open button.

5. Click the Download to BTS button.

6. Click the Close button.

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Only one of both antennas can be RET controlled (typically the 3G antenna). The feeder carrying the RET control signal is selected by a switch on the FAWA front panel.

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Feature ID: RAN1876

New innovative diplexer to co-site low (700-900Mhz) and high (1700-2100Mhz) band BTSs, using same feeders.

Benefits for the operator:

Reduces customer CAPEX because solution reduces the number of RF feeder cables to the Antenna system and extra boxes. Also no need extra Bias tees and cables. Reduces customer OPEX because installation is easier and faster and reduced unit installation cost and tower "box count" rental costs.

Functional description:

Smart diplexer solution includes two new hardware unit, FAWA low/high band combiner and FDWA low/high band diplexer. Solution support current alarming for low and high band BTS or both and devices can operate independent for Non AISG supported BTS setups. Both FAWA and FDWA Designed to be 19 inch rack mountable and 1 U high.

FDWA is a diplexer located after the feeder cables just before the Antenna Line equipment. It incorporates a wide band low pass filter with a wide band high pass filter. One unit can be used to separate the TX and RX bands for a HIGH BAND base station and LOW BAND base station from the same RF cables. FDWA is designed to be completely outdoor mounted.

FAWA is a combiner located near the BTS. It incorporates a wide band low pass filter with a wide band high pass filter. It also is powered via -48VDC. One unit can be used to combine the TX and RX bands for a HIGH BAND base station and LOW BAND base station on the same RF cable.

Current Implementation:

This is a new features.

Interdependencies between features:

This feature has no related or interworking features.

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16 RA4540GEN07GLA1 WCDMA Antenna System Features RU30 Ppt (1)