ts-3gbts-sw-0181_i3 - 3g - 3g rx diversity sharing with flexi multiradio wcdma bts

TS-3GBTS-SW-0181 - /13 © Nokia Solutions and Networks 2014 Approved 2.0 Confidential

Technical Support Note TS-3GBTS-SW-0181

3G - 3G RX Diversity sharing with Flexi Multiradio WCDMA BTS Radio Network Flexi Mult i radio BTS WCDMA

This document contains following type of information

Informative X Preventive Corrective Additional categorization Urgent Security Release Upgrade SW Update Parameterization X Information is classified as Internal Public X Customer Specific

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Table of Contents 1. Keywords .................................................................................................................................... 3 2. Compatibility / Dependencies to other products ........................................................................... 3 3. Summary ..................................................................................................................................... 3 4. Supported configurations ............................................................................................................. 3 5. Cabling Instructions ..................................................................................................................... 5

5.1 ..... Additional RX Gain parameter – compensation of additional LNA gain .................................. 6 5.1.1 Values for Additional RX Gain parameter – LNA gain of different RF module variants ........ 6 5.1.2 Example – Antenna line settings in commissioning wizard of Site Element Manager. ......... 7

5.2 ..... Commissioning of MHA settings ............................................................................................ 8 5.2.1 Example of commissioning of the MHA settings in commissioning wizard of Site Element Manager ........................................................................................................ 8

5.3 ..... RX Signal level monitoring ................................................................................................... 11 5.4 ..... Commissioning RX div sharing by defining the Virtual MHA ................................................ 12

6. REFERENCES .......................................................................................................................... 12

Contact:

Contact your local Nokia Solutions and Networks support

Summary of changes:

02-Jul-2013 1.0 Approved 19-Dec-2014 2.0 Transferred to Nokia documentation template 30-Dec-2014 3.0 TSN id corrected


Purpose This document contains generic information about products. These can be instructions that explain problem situations in the field, instructions on how to prevent or how to recover from problem situations, announcements about changes or preliminary information as requirements for new features or releases.

Validity Product Release Flexi WCDMA BTS software release WN8.0 Flexi WCDMA BTS software release WN9.0 Flexi WCDMA BTS software release WN9.1

.

1. KEYWORDS

RX diversity sharing, commissioning, RX out, uplink diversity, RAN2514, Additional RX Gain, RX div

2. COMPATIBILITY / DEPENDENCIES TO OTHER PRODUCTS

NA

3. SUMMARY

This document describes how to configure RX Diversity Sharing in to use. This allows Rx diversity over two Flexi Multiradio RF-modules operating in the same frequency band. In this solution, the RX diversity is gained by cross connecting the RX main uplink signals through the RX out interface (located at the front panel of the Radio Module). Setting of the Additional RX Gain parameter is required in the BTS commissioning for the diversity antenna branches. Value of the Additional RX Gain parameter is depending on product variant of RF module.

4. SUPPORTED CONFIGURATIONS

RX sharing capability of Flexi Multiradio RF-modules enables operators to reduce site complexity and site upgrade costs by reusing and leveraging the existing antenna system for an additional Node B.

• 2 antenna feeder lines instead of 4 • Only one X-Pol antenna per sector • No need for Multiradio Combiner (MRC) • Enables easier implementation of additional NobeB to a hot spot location


In this solution, RX main branch is provided for the Node B from TX antenna branches, whereas the RX diversity is gained by cross connecting the uplink signals led trough the RX out interface (located at the front panel of the Radio Module).

With the RX diversity sharing same configuration principles are applying than with the common A-type BTS configuration. Below is a example of typical site HW configuration with RX diversity sharing.

Figure 2 Typical site HW configuration with RX sharing

NodeB #2 System Module

NodeB #1 System module

RFM 2100

Antenna Sharing

Iub

Iub

RFM 2100

X

Figure 1 System schematic of RX shared BTS site


In RX diversity sharing all the uplink carriers of the cells must fit inside the RX bandwidth of Radio module, which for example is 20 MHz for FRGP (2100 MHz) and FXDA (900MHz). The restriction need to be taken into account when planning the carrier frequencies for the RX sharing BTS Site

In case of a small margin in available frequency band, the Over ride nominal frequency of filter center –option in BTS commissioning can be utilized to fit the carriers to RX band

5. CABLING INSTRUCTIONS

RF cabling for the RX diversity sharing is cross fed from the Radio Modules’ Rx out interface to the other Radio Modules’ Rx div. The main antenna interfaces (TX/RX main) are cabled normally and also optical cables between system module and radio module are connected normally.

Figure 3 Cross connection cabling of RX div antenna connectors

A cable kit has been prepared for implementing the required cross connections for RX Diversity Sharing, NSN product code 472454A RDSA Rx Diversity Sharing Kit 2m. The kit includes 6 cables and thus can cover the connections between two triple RF-modules i.e. three sectors.

Figure 4 A cable of RDSA kit.

PWR IN Ant 6 Rx

Ant 5 Tx/Rx

Ant 3 Tx/Rx

Ant 1 Tx/Rx

Ant 4 Rx

Ant 2 Rx

Ant 1 Rx Out

Ant 3 Rx Out

Ant 5 Rx Out EAC OPT 1 OPT 2 OPT 3

PWR IN Ant 6 Rx

Ant 5 Tx/Rx

Ant 3 Tx/Rx

Ant 1 Tx/Rx

Ant 4 Rx

Ant 2 Rx Ant 1 Rx Out

Ant 3 Rx Out

Ant 5 Rx Out EAC OPT 1 OPT 2 OPT 3


5.1 Additional RX Gain parameter – compensation of additional LNA gain

BTS commissioning is proceed normally according to the used cabling and configuration, except the antenna line settings. The Additional RX Gain parameter is required to be set for each diversity antenna line receiving the uplink signal from RxOut interface of other BTS’s RF module. As illustrated in the block diagram below, the LNA in the Front End of RX Main branches produces already the needed high gain for the UL signal received from the antenna line. This additional gain provided by the other module is required to be compensated by the Additional RX Gain parameter for achieving correct calculation of reference level in UL. Additionally, setting the Additional RX Gain parameter enables the LNA in RX div branch to operate in a low gain mode.

Figure 5 UL signal path when RXOut - RXdiv are cross connected

5.1.1 Values for Additional RX Gain parameter – LNA gain of different RF module variants

Operating range of LNA gain is depending on Flexi Multiradio RF Module variant. Therefore value for the Additional RX Gain parameter need be to set accordingly.


Table 1 Additional RX Gain value of different radio modules

5.1.2 Example – Antenna line settings in commissioning wizard of Site Element Manager.

Antenna line settings for RX main (ANT1 TX/RX, one sector demonstrated)

Figure 6 Main RX/TX antenna line settings, no changes required for commissioning

RF module Additional RX Gain (dB)FRGP 29FRIE 19FXCA 29FXCB 29FXDA 29FXDB 29FXFA 29FXFB 29FXEB 29


Antenna line settings for RX div (ANT2 RX):

Figure 7 Div RX antenna line settings. Correct value for the additional gain parameter must be

set. 5.2 Commissioning of MHA settings

Commissioning of MHA settings don’t not have difference in case of RX div sharing. Whenever there is a MHA used in the physical antenna feeder lines, it is required to commission the MHA settings the TX/RX main branch in both of the BTS.

5.2.1 Example of commissioning of the MHA settings in commissioning wizard of Site Element Manager.

BTS #1 – master for MHA operation, detects and operates WMHD in AISG mode

Figure 8 BTS #1 - MHA detected, LNA1 is set in use for the TX/RX main branch

Additional RX Gain is required to be set accordingly.


Figure 9 BTS #1 - LNA2 is set to be used for the other BTS (TX/RX main of BTS #2)

Figure 10 BTS #1 - MHA settings for TX/RX main antenna line need to set as is with a regular BTS site configuration


Figure 11 BTS #1 - MHA settings for RXdiv antenna line. No any MHA is set in use.

BTS #2 – not controlling MHA operation, MHA type of the LNA2 is commissioned as Other

Figure 12 BTS #2 - MHA settings for TX/RX main antenna line. MHA type is set as Other for the LNA2.

MHA type is set as Other for the LNA2 No feeder voltage enabled MHA Gain is set respectively 12 dBm


Figure 13 BTS #2 - MHA settings for RXdiv antenna line. No any MHA is set in use.

5.3 RX Signal level monitoring

It is recommended to activate RX Signal Level Monitoring feature for the BTS utilizing the RX diversity sharing. It is essential for verifying the installation and commissioning as well for monitoring signal level provided by the other NodeB and its’ antenna line.

Figure 14 RX signal level monitoring - RX main and div are at the same level, configuration was done correctly.


Figure 15 RX signal level monitoring - RX signal level failure, The Additional RX Gain parameter value was not set when commissioned.

5.4 Commissioning RX div sharing by defining the virtual MHA

Prior introduction the Additional RX Gain parameter the Technical Note 144 was describing the workaround commissioning of RX sharing with the old 3G BTS SW releases (WN6.0 MP3.x and ) where support of the Additional RX Gain parameter did not exist. This previous way of commissioning by setting a gain of virtual MHA in RX antenna line is not necessary and thus obsolete. Commissioning with utilizing the Additional RX Gain parameter provides simpler, more straightforward and fault tolerating approach for defining the commissioning and plan parameters.

6. REFERENCES

TS-3GBTS-SW-0144 RX Diversity sharing between Flexi EDGE BTS and Flexi WCDMA BTS


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