gu 900 mhz non-standard frequency spacing(sran7.0_01)

GU 900 MHz Non-standard Frequency Spacing SRAN7.0

Feature Parameter Description

Issue 01

Date 2012-04-30

HUAWEI TECHNOLOGIES CO., LTD.

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SingleRAN

GU 900 MHz Non-standard Frequency Spacing Contents

Issue 01 (2012-04-30) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i

Contents

1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience ........................................................................................................................ 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview ..................................................................................................................................... 2-1

2.1 Features Involved in GU 900 MHz Non-standard Frequency Spacing ......................................... 2-1

2.2 Application Scenarios and Benefits ............................................................................................... 2-1

3 Technical Description .............................................................................................................. 3-1

3.1 2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8

MHz) .................................................................................................................................................... 3-1

3.2 Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz) .................................. 3-2

3.3 GSM Power Control on Interference Frequency for GU Small Frequency Gap ........................... 3-2

3.3.1 ARFCN ................................................................................................................................. 3-4

3.3.2 Transmit Power of Interfering Frequencies .......................................................................... 3-4

3.3.3 Power Compensation ........................................................................................................... 3-5

4 Related Features ....................................................................................................................... 4-1


MHz) .................................................................................................................................................... 4-1

4.1.1 Required Features ................................................................................................................ 4-1

4.1.2 Mutually Exclusive Features ................................................................................................. 4-1

4.1.3 Affected Features ................................................................................................................. 4-1









5 Impact on the Network ............................................................................................................ 5-1


MHz) .................................................................................................................................................... 5-1

5.1.1 Impact on System Capacity .................................................................................................. 5-1

5.1.2 Impact on Network Performance .......................................................................................... 5-1






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6 Engineering Guidelines ........................................................................................................... 6-1

6.1 When to Use GU 900 MHz Non-standard Frequency Spacing ..................................................... 6-1

6.1.1 2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming

3.8 MHz) ........................................................................................................................................ 6-1

6.1.2 Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz) ......................... 6-1

6.1.3 GSM Power Control on Interference Frequency for GU Small Frequency Gap .................. 6-2

6.2 Information to Be Collected ........................................................................................................... 6-2


3.8 MHz) ........................................................................................................................................ 6-2



6.3 Network Planning .......................................................................................................................... 6-4


3.8 MHz) ........................................................................................................................................ 6-4



6.4 Deploying 2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU

Refarming 3.8 MHz) ............................................................................................................................ 6-7

6.4.1 Deployment Requirements ................................................................................................... 6-7

6.4.2 Data Preparation .................................................................................................................. 6-7

6.4.3 Precautions ........................................................................................................................... 6-8

6.4.4 Hardware Adjustment ........................................................................................................... 6-8

6.4.5 Initial Configuration ............................................................................................................... 6-8

6.4.6 Activation Observation .......................................................................................................... 6-9

6.4.7 Additional Configuration........................................................................................................ 6-9

6.4.8 Deactivation .......................................................................................................................... 6-9

6.5 Deploying Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz) ................ 6-9

6.5.1 Deployment Requirements ................................................................................................... 6-9

6.5.2 Data Preparation .................................................................................................................. 6-9

6.5.3 Precautions ........................................................................................................................... 6-9

6.5.4 Hardware Adjustment ........................................................................................................... 6-9

6.5.5 Initial Configuration ............................................................................................................. 6-10

6.5.6 Activation Observation ........................................................................................................ 6-10

6.5.7 Additional Configuration...................................................................................................... 6-10

6.6 Deploying GSM Power Control on Interference Frequency for GU Small Frequency Gap ........ 6-10

6.6.1 Deployment Requirements ................................................................................................. 6-10

6.6.2 Data Preparation .................................................................................................................6-11

6.6.3 Precautions ......................................................................................................................... 6-12

6.6.4 Hardware Adjustment ......................................................................................................... 6-12

6.6.5 Initial Configuration ............................................................................................................. 6-13

6.6.6 Activation Observation ........................................................................................................ 6-13

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6.6.7 Additional Configuration...................................................................................................... 6-14

6.7 Performance Optimization ........................................................................................................... 6-14


3.8 MHz) ...................................................................................................................................... 6-14

6.7.2 Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz) ....................... 6-18

6.7.3 GSM Power Control on Interference Frequency for GU Small Frequency Gap ................ 6-19

6.8 Troubleshooting ........................................................................................................................... 6-21


3.8 MHz) ...................................................................................................................................... 6-21

6.8.2 Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz) ....................... 6-21

6.8.3 GSM Power Control on Interference Frequency for GU Small Frequency Gap ................ 6-21

7 Parameters ................................................................................................................................. 7-1

Counters ......................................................................................................................................... 8-1

8 Glossary ...................................................................................................................................... 9-1

9 Reference Documents ........................................................................................................... 10-1

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GU 900 MHz Non-standard Frequency Spacing 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes GU 900 MHz Non-standard Frequency Spacing, including the working principles, parameter reconfiguration, feature dependencies, network impact, and engineering guidelines.

GU 900 MHz Non-standard Frequency Spacing includes the following optional features and function:

MRFD-211703 2.0MHz Central Frequency point separation between GSM and UMTS mode(GSM) feature

MRFD-221703 2.0MHz Central Frequency point separation between GSM and UMTS mode(UMTS) feature

MRFD-211804 GSM Power Control on Interference Frequency for GU Small Frequency gap (GSM) feature

MRFD-221804 GSM Power Control on Interference Frequency for GU Small Frequency gap (UMTS) feature

GU refarming 4.2 MHz function in the WRFD-021001 Flexible frequency bandwidth of UMTS carrier feature

1.2 Intended Audience

This document is intended for:

Personnel who are familiar with GSM and WCDMA basics

Personnel who need to understand GU 900 MHz Non-standard Frequency Spacing

Personnel who work with Huawei products

1.3 Change History

This section provides information about the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to a change in the GU 900 MHz Non-standard Frequency Spacing feature of a specific product version.

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issues

The document issue is as follows:

01 (2012-04-30)

Draft A (2012-02-15)

01 (2012-04-30)

This is the first release of the document for SRAN7.0.

Compared with issue draft A (2012-02-15) of SRAN7.0, this issue optimizes the description.

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GU 900 MHz Non-standard Frequency Spacing 1 Introduction



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Change Type Change Description Parameter Change

Feature change None. None.

Editorial change The information about how to activate this feature is added. None

Draft A (2012-02-15)

This is the draft A of the document for SRAN7.0.

This is a new document.

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GU 900 MHz Non-standard Frequency Spacing 2 Overview



2-1

2 Overview

The 900 MHz or 850 MHz band has better propagation performance than the 2100 MHz band, but 900 MHz or 850 MHz spectrum resources are much scarcer than 2100 MHz spectrum resources. The conflict between resource limitation and service expansion is especially evident for the 900 MHz or 850 MHz band. Some telecom operators are unable to reserve a standard bandwidth of 5 MHz from the 900 MHz or 850 MHz band by refarming for UMTS services. GU 900 MHz Non-standard Frequency Spacing is introduced to solve this problem. It supports a non-standard bandwidth of 3.8 MHz or 4.2 MHz for a UMTS carrier, providing a new UMTS deployment scheme for telecom operators.

Refarming indicates that telecom operators replan frequency resources and improve the spectral efficiency and data throughput by introducing new wireless telecommunications technologies such as UMTS or Long Term Evolution (LTE). GU refarming can be performed on the 900 MHz and 850 MHz bands. GL refarming can be performed on the 900 MHz and 1800 MHz bands. Currently, most telecom operators perform GU refarming on the 900 MHz band.

2.1 Features Involved in GU 900 MHz Non-standard Frequency Spacing

In GU refarming 3.8 MHz and 4.2 MHz scenarios, network performance is mainly affected by adjacent-frequency interference between GSM and UMTS networks. The features included in GU 900 MHz Non-standard Frequency Spacing are used to minimize the adjacent-frequency interference. The features and their associated function are as follows:

MRFD-211703 2.0MHz Central Frequency point separation between GSM and UMTS mode(GSM) and MRFD-221703 2.0MHz Central Frequency point separation between GSM and UMTS mode(UMTS), collectively referred to as 2.0MHz Central Frequency point separation between GSM and UMTS mode in the following paragraphs.

MRFD-211804 GSM Power Control on Interference Frequency for GU Small Frequency gap (GSM) and MRFD-221804 GSM Power Control on Interference Frequency for GU Small Frequency gap (UMTS), collectively referred to as GSM Power Control on Interference Frequency for GU Small Frequency gap in the following paragraphs.

GU refarming 4.2 MHz function in the WRFD-021001 Flexible frequency bandwidth of UMTS carrier feature.

2.2 Application Scenarios and Benefits

The 2.0MHz Central Frequency point separation between GSM and UMTS mode feature supports GU refarming 3.8 MHz. This feature introduces a NodeB 3.8 MHz static filter. Compared with a 5.0 MHz filter, the NodeB 3.8 MHz static filter improves HSUPA performance in GU refarming 3.8 MHz scenarios and minimizes the interference GSM MSs cause to UMTS.

The Flexible frequency bandwidth of UMTS carrier feature supports GU refarming 4.2 MHz. This feature reduces the interference from GSM to UMTS in the uplink as compared with GU refarming 5 MHz.

The GSM Power Control on Interference Frequency for GU Small Frequency gap feature supports GU refarming 3.8 MHz and 4.2 MHz. This feature reduces the interference from GSM to UMTS in the downlink and improves HSDPA performance. This is done by decreasing the transmit power of GSM frequencies that are spaced 2.0 MHz or 2.2 MHz away from the UMTS center frequency.

In GU refarming 3.8 MHz scenarios, 2.0MHz Central Frequency point separation between GSM and UMTS mode can be used together with GSM Power Control on Interference Frequency for GU Small Frequency gap. The 2.0MHz Central Frequency point separation between GSM and UMTS mode feature reduces the interference from GSM to UMTS in the uplink, improving HSUPA performance. The GSM Power Control on Interference Frequency for GU Small Frequency gap feature reduces the interference from GSM to UMTS in the downlink, improving HSDPA performance.

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GU 900 MHz Non-standard Frequency Spacing 2 Overview



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In GU refarming 4.2 MHz scenarios, Flexible frequency bandwidth of UMTS carrier can be used together with GSM Power Control on Interference Frequency for GU Small Frequency gap. The Flexible frequency bandwidth of UMTS carrier reduces the interference from GSM to UMTS in the uplink, improving HSUPA performance. The GSM Power Control on Interference Frequency for GU Small Frequency gap feature reduces the interference from GSM to UMTS in the downlink, improving HSPA+ performance.

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GU 900 MHz Non-standard Frequency Spacing 3 Technical Description



3-1

3 Technical Description

3.1 2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8 MHz)

The 2.0MHz Central Frequency point separation between GSM and UMTS mode feature improves spectral utilization. This feature allocates 3.8 MHz bandwidth instead of 5 MHz bandwidth to UMTS and reserves 1.2 MHz bandwidth for GSM. Figure 3-1 and Figure 3-2 show the GU sandwich frequency allocation scheme and GU edge frequency allocation scheme, respectively.

Figure 3-1 GU sandwich frequency allocation scheme

Figure 3-2 GU edge frequency allocation scheme

In Figure 3-1 and Figure 3-2, f1 and f2 indicate the spacing between the GSM and UMTS center frequencies, which is 2.0 MHz.

Center frequency refers to the frequency halfway between the upper and lower cutoff frequencies of an absolute radio frequency channel number (ARFCN). The center frequency of a UMTS non-standard 3.8 MHz bandwidth is spaced 1.9 MHz away from both the upper and lower cutoff frequencies. Each GSM carrier has a bandwidth of 200 kHz. A GSM center frequency is spaced 100 kHz away from the upper and lower cutoff frequencies. If the spacing between the GSM and UMTS center frequencies is 2.0 MHz, UMTS has a bandwidth of 3.8 MHz.

A UMTS bandwidth of less than 5 MHz is regarded as a non-standard bandwidth. The GSM frequencies that are spaced less than 2.6 MHz away from the UMTS center frequency are termed small-spaced frequencies, also known as interfering frequencies.

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The GU sandwich frequency allocation scheme has the following advantages over the GU edge frequency allocation scheme:

The UMTS network does not produce interference on the networks of other telecom operators.

Together with an anti-interference function, the GU sandwich frequency allocation scheme minimizes the frequency spacing between GSM and UMTS center frequencies. This increases the number of available GSM frequencies and improves spectral utilization without sacrificing UMTS performance.

Therefore, the GU sandwich frequency allocation scheme is recommended for small GSM/UMTS frequency spacing scenarios.

The 2.0MHz Central Frequency point separation between GSM and UMTS mode feature uses only the FMBWH parameter. FMBWH specifies the minimum effective bandwidth of a UMTS carrier. When this parameter is set to 4200, the minimum effective bandwidth of the UMTS carrier is 4.2 MHz. When this parameter is set to 3800, the minimum effective bandwidth of the UMTS carrier is 3.8 MHz.

3.2 Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz)

Flexible frequency bandwidth of UMTS carrier supports GSM and UMTS center frequency spacing of 2.2 MHz and reserves 0.8 MHz bandwidth for GSM. However, after this feature is applied, UMTS performance deteriorates because UMTS is interfered by GSM frequencies that are spaced less than 2.6 MHz away from the UMTS center frequency.

3.3 GSM Power Control on Interference Frequency for GU Small Frequency Gap

In small GSM/UMTS frequency spacing scenarios (such as GU refarming 3.8 MHz and GU refarming 4.2 MHz), this feature decreases the transmit power of GSM frequencies that are spaced 2.0 MHz or 2.2 MHz away from the UMTS center frequency. To compensate for GSM performance loss caused by power compression, this feature performs power compensation on non-interfering frequencies. Therefore, this feature is also termed frequency-based power control.

GSM data is sent in bursts on each TCH by using frequency hopping (FH). When GSM data is transmitted on a frequency that is spaced 2.0 MHz or 2.2 MHz away from the UMTS center frequency, GSM actively performs power compression on this frequency to reduce the interference to UMTS in the downlink. To compensate for performance loss caused by power compression, GSM performs power compensation on non-interfering frequencies that participated in FH. Power compression further decreases the power after power control, whereas power compensation further increases the power after power control. Figure 3-3 illustrates the principles of power compression and power compensation.

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Figure 3-3 Power compression and power compensation

Power compensation ensures that the service quality of UEs with a large frame error rate (FER) does not deteriorate. Figure 3-4 shows the impact of this feature on the FER.

Figure 3-4 Impact on the FER

After this feature is applied,

The FERs originally greater than 1% decrease.

The FERs originally smaller than 1% slightly increase.

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After frequency-based power control is applied, the bit error rate (BER) increases, and the average transmit power also increases because power control decision is made based on the BER. Figure 3-5 shows the increase in average downlink transmit power.

Figure 3-5 Increase in average downlink transmit power

In addition, GSM compensates for the decreased signal level to protect MSs at the cell edge against unnecessary handovers. The GUDegratePwrCtrl parameter specifies whether to enable frequency-based power control. The value ON indicates that frequency-based power control is enabled. The value OFF indicates that frequency-based power control is disabled.

3.3.1 ARFCN

The UMTSFreqNum1 and UMTSFreqNum2 parameters specify the ARFCNs for UMTS frequencies that are spaced 2.0 MHz or 2.2 MHz away from the GSM frequency in GU refarming scenarios.

The GSM Power Control on Interference Frequency for GU Small Frequency gap feature allows a maximum of two UMTS frequencies. When one UMTS frequency is deployed in GU refarming scenarios, only UMTSFreqNum1 is configured. When two UMTS frequencies are deployed in GU refarming scenarios, both UMTSFreqNum1 and UMTSFreqNum2 are configured.

3.3.2 Transmit Power of Interfering Frequencies

The transmit power of interfering frequencies can be controlled by setting the following parameters:

GU2000KHzMaxVal: Maximum decrease in the transmit power of interfering frequencies when there is 2.0 MHz frequency spacing between GSM and UMTS networks. The desired transmit power of interfering frequencies that are spaced 2.0 MHz away from the UMTS center frequency is equal to the maximum TRX transmit power minus the parameter value.

GU2200KHzMaxVal: Maximum decrease in the transmit power of interfering frequencies when there is 2.2 MHz frequency spacing between GSM and UMTS networks. The desired transmit power of interfering frequencies that are spaced 2.2 MHz away from the UMTS center frequency is equal to the maximum TRX transmit power minus the parameter value.

The GUDegratePwrPri parameter specifies the frequency-based power control policy during the power compression of GSM interfering frequencies.

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When this parameter is set to GSM(GSM), this feature preferentially guarantees the GSM network quality.

If the power of non-interfering frequencies was sufficiently compensated, the transmit power of the interfering frequencies decreases to the desired value, which is equal to the maximum TRX transmit power minus GU2000KHzMaxVal or GU2200KHzMaxVal.

If the power of non-interfering frequencies was insufficiently compensated, the transmit power of the interfering frequencies decreases to the allowed value, which is determined based on the power compensation amplitude.

When this parameter is set to UMTS(UMTS), this feature preferentially guarantees the UMTS network quality. The transmit power of the interfering frequencies decreases to the desired value regardless of whether the power of non-interfering frequencies was sufficiently compensated.

3.3.3 Power Compensation

Table 3-1 describes the power compensation parameters for non-AMR and AMR HR services. Non-AMR HR services include enhanced full rate (EFR), full rate (FR), half rate (HR), and adaptive multirate (AMR) FR services.

Table 3-1 Power compensation parameters for non-AMR and AMR HR services

Service Type

Parameter Name Description

Non-AMR HR services

NAHRCompCoeff Proportion of power compensation for the non-interfering frequencies to power decrease each time the transmit power of the interfering frequencies is decreased by 1 dB for EFR, FR, HR, and AMR FR calls.

NAHRCompOffVal Power compensation offset for EFR, FR, HR, and AMR FR calls. This parameter is used to calculate the power compensation for the non-interfering frequencies.

AMR HR services

AHRCompCoeff Proportion of power compensation for the non-interfering frequencies to power decrease each time the transmit power of the interfering frequencies is decreased by 1 dB for AMR HR calls.

AHRCompOffVal Power compensation offset for AMR HR calls. This parameter is used to calculate the power compensation for the non-interfering frequencies.

After power compression for interfering frequencies, GSM compensates for the decreased signal level to protect MSs at the cell edge against unnecessary handovers. During the power compensation, the BTS increases the downlink receive level reported by the MS to the value before power compression was performed. The increase in the downlink receive level is determined by the power decrease amplitude, power increase amplitude, and total number of frames transmitted for each SACCH. The formula for calculating the downlink receive level is as follows:

Downlink receive level after power compensation = Downlink receive level before power compensation + Power decrease amplitude for interfering frequencies/Total number of frames sent on the SACCH Power increase amplitude for non-interfering frequencies/Total number of frames sent on the SACCH

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GU 900 MHz Non-standard Frequency Spacing 4 Related Features



4-1

4 Related Features


4.1.1 Required Features

Optimized Huawei III Power Control Algorithm, which is part of the GBFD-117601 Huawei III Power Control Algorithm feature

Optimized Huawei III Power Control Algorithm must be enabled in small GSM/UMTS frequency spacing scenarios. This feature lowers the overall interference from GSM MSs to UMTS NodeBs and from GSM BTSs to UMTS UEs.

GBFD-114801 Discontinuous Transmission (DTX) Downlink and GBFD-114803 Discontinuous Transmission (DTX) Uplink

Uplink and downlink DTX are recommended for small GSM/UMTS frequency spacing scenarios. Uplink and downlink DTX reduce the interference from GSM voice calls to UMTS, improving UMTS throughput and user experience.

For details on Optimized Huawei III Power Control Algorithm, see the GBSS document Power Control Feature Parameter Description.

For details on DTX, see the GBSS document Discontinuous Transmission and Discontinuous Reception Feature Parameter Description.

4.1.2 Mutually Exclusive Features

If the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature is enabled, the following features cannot be enabled simultaneously:

GBFD-510104 Multi-site Cell

GBFD-110802 Pre-processing of Measurement Report

When the preceding features are both enabled, power control cannot be performed in time for UEs performing an inter-subsite handover. As a result, the UEs may have a very low receive level and become muted.

4.1.3 Affected Features

WRFD-020136 Anti-Interference Scheduling for HSUPA

Anti-Interference Scheduling for HSUPA significantly reduces the impact of instantaneous strong interference caused by GSM user access on UMTS HSUPA performance.

This feature is optional in small GSM/UMTS frequency spacing scenarios.

For details, see the RAN document HSUPA Feature Parameter Description.

GBFD-117602 Active Power Control

Active Power Control is recommended for small GSM/UMTS frequency spacing scenarios. This feature reduces the interference from GSM MSs to UMTS NodeBs during initial access and the interference from GSM BTSs to UMTS UEs during initial data transfer.

For details, see the GBSS document Power Control Feature Parameter Description.

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This feature depends on the same features as 2.0MHz Central Frequency point separation between GSM and UMTS mode.


None.


This feature affects the same features as 2.0MHz Central Frequency point separation between GSM and UMTS mode.



GBFD-113701 Frequency Hopping (RF hopping, baseband hopping)

The interfering frequencies must participate in FH.

For details, see the GBSS document Frequency Hopping Feature Parameter Description.


None.


GBFD-117002 IBCA (Interference Based Channel Allocation)

After the GSM Power Control on Interference Frequency for GU Small Frequency gap feature is enabled, the estimated interference between established UEs and new UEs is inaccurate because the actual BTS transmit power differs from the power required by power control. As a result, IBCA produces less gain.

GBFD-118106 Dynamic Power Sharing

After the GSM Power Control on Interference Frequency for GU Small Frequency gap feature is enabled, Multi-Carrier Power Allocation (MCPA) decision may be incorrect because the actual BTS transmit power differs from the power required by power control. As a result, the performance of the MCPA algorithm is affected.

For details on Dynamic Power Sharing, see the GBSS document GSM Dynamic Power Sharing Feature Parameter Description.

MRFD-211801 Multi-mode Dynamic Power Sharing(GSM) and MRFD-221801 Multi-mode Dynamic Power Sharing(UMTS)

After Multi-mode Dynamic Power Sharing is enabled, the idle power of a GSM carrier is shared by the UMTS network, and the interference from UMTS to GSM increases. In addition, frequency-based

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power control performs power compression on interfering frequencies, and the anti-interference performance of interfering frequencies declines. Therefore, after Multi-mode Dynamic Power Sharing is enabled, the GSM network quality deteriorates.

Frequency-based power control also performs power compensation on non-interfering frequencies. After power compensation, the GSM power that can be shared by UMTS declines, and the gain produced by Multi-mode Dynamic Power Sharing decreases.

GSM Power Control on Interference Frequency for GU Small Frequency gap is not recommended when Multi-mode Dynamic Power Sharing is enabled.

For details, see the SingleRAN document GSM and UMTS Dynamic Power Sharing Feature Parameter Description.

GBFD-113201 Concentric Cell

In a concentric cell, if the mobile allocation (MA) for the overlaid subcell includes interfering frequencies, power compression is performed only in the overlaid subcell. If the MA for the underlaid subcell includes interfering frequencies, power compression is performed only in the underlaid subcell.

After GSM Power Control on Interference Frequency for GU Small Frequency gap is enabled, the triggering conditions for coverage-based handovers between the overlaid and underlaid subcells remain unchanged, and those for load-based handovers between the overlaid and underlaid subcells become more stringent. This prevents interfering frequencies from being frequently used.

GBFD-115507 WB AMR

WB AMR is a coding scheme that can significantly improve speech quality. WB AMR increases the sampling rate to 16 kHz and decreases the number of redundant bits. The decrease in the number of redundant bits increases links' sensitivity to power decrease. As a result, any power decrease lowers the WB AMR speech quality.

For details, see the GBSS document WB AMR Feature Parameter Description.

GBFD-115830 VAMOS

When VAMOS is enabled together with frequency-based power control, the gain produced by VAMOS decreases because the downlink receive quality deteriorates after power compression is performed on interfering frequencies. In addition, the maximum power decrease amplitude needs to be set to a larger value after VAMOS is enabled, which increases the adverse effect on GSM KPIs.

For details, see the GBSS document VAMOS Feature Parameter Description.

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GU 900 MHz Non-standard Frequency Spacing 5 Impact on the Network



5-1

5 Impact on the Network


5.1.1 Impact on System Capacity

The 2.0MHz Central Frequency point separation between GSM and UMTS mode feature allocates non-standard bandwidth of 3.8 MHz to UMTS. This reduces the GSM network capacity. However, this feature significantly improves the capacity of GSM and UMTS networks as a whole because UMTS has much higher spectral efficiency than GSM.

5.1.2 Impact on Network Performance

This feature decreases the spacing between GSM and UMTS center frequencies to 2.0 MHz, which has the following impacts on network performance:

The throughput of UMTS HSPA services decreases because the GSM and UMTS networks interfere with each other and the UMTS network uses a 3.8 MHz static filter.

The throughput of GSM EDGE services decreases because of UMTS interference. (It is not recommended that PDCHs be configured on interfering frequencies.)

The mean opinion scores (MOSs) of GSM and UMTS decrease.

GSM KPIs are adversely affected because the frequency reuse pattern for GSM may become tight after this feature is deployed.

HSPA+ services such as 64QAM, MIMO, and DC do not have better performance than 16QAM.

UMTS UEs using 64QAM can only reach the data rate of 16QAM because of the interference from GSM to UMTS.

The preceding impacts on network performance, except the MOS decrease, can be determined by the counters on the M2000. The MOS decrease can be evaluated by drive tests (DTs) or speech service test tools.



The Flexible frequency bandwidth of UMTS carrier feature allocates non-standard bandwidth of 4.2 MHz to UMTS. This reduces the GSM network capacity. However, this feature significantly improves the capacity of GSM and UMTS networks as a whole because UMTS has much higher spectral efficiency than GSM.


This feature has the following impacts on network performance:

The throughput of UMTS HSPA services decreases because the GSM and UMTS networks interfere with each other and the UMTS network uses a 4.2 MHz static filter.

The throughput of GSM EDGE services decreases because of UMTS interference. (It is not recommended that this feature be enabled together with GBFD-114201 EGPRS.)

The MOSs of GSM and UMTS decrease.

GSM KPIs are adversely affected because the frequency reuse pattern for GSM may become tight after this feature is deployed.

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The preceding impacts on network performance, except the MOS decrease, can be determined by the counters on the M2000. The MOS decrease can be evaluated by drive tests (DTs) or speech service test tools.



The GSM Power Control on Interference Frequency for GU Small Frequency gap feature improves HSDPA performance in GU refarming 3.8 MHz and GU refarming 4.2 MHz scenarios. This is done by decreasing the transmit power of GSM frequencies that are spaced 2.0 MHz or 2.2 MHz away from the UMTS center frequency.

HSDPA performance is improved in the following aspects:

Enhanced HSDPA link quality

Increased HSDPA throughput

Increased average number of HSDPA UEs


Impact on network KPIs

The GSM receive quality deteriorates regardless of the setting of the GUDegratePwrPri parameter. As a result, the call drop rate, handover success rate, channel assignment success rate, congestion rate, and MOS are affected. In addition, the average downlink transmit power increases because of power compensation for non-interfering frequencies.

When the transmit power of GSM interfering frequencies is reduced, the interference from GSM to UMTS decreases. This has the following impact on GSM and UMTS KPIs, as listed in Table 5-1.

Table 5-1 Affected GSM and UMTS KPIs

Mode KPI Impact

GSM High quality indicator (HQI) Decreases

Call drop rate Slightly increases

Channel assignment success rate Slightly decreases

Handover success rate Slightly decreases

MOS Slightly decreases

Average downlink transmit power Increases

Congestion rate Slightly increases

UMTS HSDPA throughput Increases

Call drop rate Decreases

RAB setup success rate Increases

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Table 5-1 assumes that one third of GSM frequencies are interfering frequencies. For example, if six GSM frequencies participate in FH, two of them are interfering frequencies.

Impact on user experience

The GSM speech quality deteriorates, and the UMTS data rate increases.

The preceding impacts on network performance, except the MOS decrease and speech quality deterioration, can be determined by the counters on the M2000. The MOS decrease and speech quality deterioration can be evaluated by drive tests (DTs) or speech service test tools.

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GU 900 MHz Non-standard Frequency Spacing 6 Engineering Guidelines



6-1

6 Engineering Guidelines

6.1 When to Use GU 900 MHz Non-standard Frequency Spacing

6.1.1 2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8 MHz)

The 2.0MHz Central Frequency point separation between GSM and UMTS mode feature applies only to scenarios where all the following conditions are met:

The GSM and UMTS networks are deployed in rural areas, where the distance between BTSs is greater than or equal to 2.5 kilometers.

The GSM and UMTS networks are deployed by the same telecom operator and both networks use Huawei equipment.

The GSM and UMTS networks share the same site and cover the same geographical area.

GSM has a continuous spectrum greater than or equal to 5 MHz.

The UMTS network adopts the GU sandwich frequency allocation scheme.

The frequency set configured for each GSM cell includes a maximum of one frequency that is spaced 2.0 MHz away from the UMTS center frequency.

2.0MHz Central Frequency point separation between GSM and UMTS mode achieves better performance if the following optional conditions are also met:

The BCCH is configured on a GSM frequency that is spaced more than 2.2 MHz (recommended configuration: more than 2.6 MHz) away from the UMTS center frequency.

The PDCH is configured on a non-interfering frequency, such as the BCCH frequency.

6.1.2 Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz)

The Flexible frequency bandwidth of UMTS carrier feature is recommended for scenarios where all the following conditions are met:

The GSM and UMTS networks are deployed by the same telecom operator and both networks use Huawei equipment.


GSM has a continuous spectrum greater than or equal to 5.4 MHz.

The UMTS network adopts the GU sandwich frequency allocation scheme.

The frequency set configured for each GSM cell includes a maximum of one frequency that is spaced 2.2 MHz away from the UMTS center frequency.

The BCCH is configured on a GSM frequency that is spaced more than 2.2 MHz (recommended configuration: more than 2.6 MHz) away from the UMTS center frequency.

The PDCH is configured on a non-interfering frequency, such as the BCCH frequency.

Active Power Control and Optimized Huawei III Power Control Algorithm are enabled on the GSM network to reduce the interference from GSM to UMTS.

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6.1.3 GSM Power Control on Interference Frequency for GU Small Frequency Gap

The GSM Power Control on Interference Frequency for GU Small Frequency gap feature is recommended for the following refarming scenarios:

The UMTS network uses a non-standard bandwidth of 3.8 MHz and the number of FH TCH frequencies is greater than or equal to 6 (the probability of interfering frequencies in a GSM cell is less than or equal to 1/3) in a GSM cell. In addition, the GSM cell meets the following conditions:

The GSM cell uses interfering frequencies.

The GSM cell is co-sited with a UMTS 900 MHz cell or the GSM has an adjacent UMTS 900 MHz cell.

The UMTS network uses a non-standard bandwidth of 4.2 MHz and the number of FH TCH frequencies is greater than or equal to 6 (the probability of interfering frequencies in a GSM cell is less than or equal to 1/3) in a GSM cell. In addition, the GSM cell meets the following conditions:

The GSM cell uses interfering frequencies.

The GSM cell is co-sited with a UMTS 900 MHz cell or the GSM has an adjacent UMTS 900 MHz cell.

In GU refarming 3.8 MHz scenarios, the probability of interfering frequencies in a GSM cell equals the number of GSM frequencies that are spaced 2.0 MHz away from the UMTS center frequency divided by the number of FH TCH frequencies.

In GU refarming 4.2 MHz scenarios, the probability of interfering frequencies in a GSM cell equals the number of GSM frequencies that are spaced 2.2 MHz away from the UMTS center frequency divided by the number of FH TCH frequencies.

6.2 Information to Be Collected


Table 6-1 lists the information required for implementing the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature.

Table 6-1 Information to be collected

Information Item Reason

Distance between BTSs and the bandwidth of a continuous GSM spectrum

The distance between BTSs must be greater than or equal to 2.5 kilometers. GSM must have a continuous spectrum greater than or equal to 5 MHz.

Areas to deploy this feature and site information

The information needs to be confirmed.

Whether the GSM and UMTS networks share the same site, cover the same geographical area, use Huawei equipment, and are deployed by the same telecom operator

The GSM and UMTS networks must share the same site, cover the same geographical area, use Huawei equipment, and be deployed by the same telecom operator.

BCCH and PDCH frequencies The BCCH and PDCH must be configured on GSM frequencies that are spaced more than 2.2 MHz away from the UMTS center frequency.

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Status of GBFD-117602 Active Power Control, GBFD-114803 DTX Uplink, GBFD-114801 DTX Downlink, and GBFD-117601 Optimized Huawei III Power Control Algorithm on the GSM network

These features and function must have been enabled.

Whether HSPA+ services, such as WRFD-010683 64QAM, WRFD-010684 MIMO, and WRFD-010696 DC, are required

If HSPA+ services are required, inform telecom operators that HSPA+ services cannot produce any gain if the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature is enabled.

Status of the GBFD-510104 Multi-site Cell and GBFD-110802 Pre-processing of Measurement Report features on the GSM network

These features must have been disabled.


Table 6-2 lists the information required for implementing Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz).



Distance between BTSs and the bandwidth of a continuous GSM spectrum

GSM must have a continuous spectrum greater than or equal to 5.4 MHz.

Whether the GSM and UMTS networks share the same site, cover the same geographical area, use Huawei equipment, and are deployed by the same telecom operator

The GSM and UMTS networks must share the same site, cover the same geographical area, use Huawei equipment, and be deployed by the same telecom operator.


Status of the GBFD-117602 Active Power Control, GBFD-114803 DTX Uplink, GBFD-114801 DTX Downlink, and GBFD-117601 Optimized Huawei III Power Control Algorithm features on the GSM network

These features must have been enabled.

Whether HSPA+ services, such as WRFD-010683 64QAM, WRFD-010684 MIMO, and WRFD-010696 DC, are required

If HSPA+ services are required, inform telecom operators that HSPA+ services cannot produce any gain if the Flexible frequency bandwidth of UMTS carrier feature is enabled.

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Table 6-3 lists the information required for implementing the GSM Power Control on Interference Frequency for GU Small Frequency gap feature.



Whether the refarming scenario is GU refarming 3.8 MHz or GU refarming 4.2 MHz

Different refarming scenarios require different parameter settings.

Whether telecom operators intend to preferentially guarantee the GSM or UMTS network quality and whether telecom operators require high HSPA+ performance in GU refarming 4.2 MHz scenarios

The setting of the GUDegratePwrPri parameter needs to be confirmed.


Whether GBFD-117601 Optimized Huawei III Power Control Algorithm is enabled

Optimized Huawei III Power Control Algorithm is recommended.

Whether GBFD-114801 Discontinuous Transmission (DTX) Downlink is enabled

Discontinuous Transmission (DTX) Downlink is recommended.

Whether the BCCH frequency participates in FH

Power compression cannot be performed on the BCCH frequency.

Whether the interfering frequencies participate in FH

The Frequency Hopping (RF hopping, baseband hopping) feature must have been enabled.

Status of the GBFD-117002 IBCA, GBFD-118106 Dynamic Power Sharing, MRFD-211801 Multi-mode Dynamic Power Sharing(GSM), GBFD-113201 Concentric Cell, and GBFD-115507 WB AMR features

When any of these features is enabled together with the GSM Power Control on Interference Frequency for GU Small Frequency gap feature, the gains produced by the two features are reduced.

Whether the GBFD-115502 AMR HR feature is enabled

Whether the AHRCompCoeff and AHRCompOffVal parameters should be set needs to be confirmed.

6.3 Network Planning


This feature is enabled after GU refarming. RF planning for this feature needs to be performed by Huawei technical support personnel.

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6-5

RF Planning

GU frequency allocation

An appropriate frequency allocation scheme improves spectral utilization. With the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature, the UMTS network can be deployed by using either GU sandwich frequency allocation or GU edge frequency allocation. The GU sandwich frequency allocation scheme is recommended for small GSM/UMTS frequency spacing scenarios. This scheme reserves three GSM frequencies more than the GU edge frequency allocation scheme and does not produce interference on the networks of other telecom operators.

Small-spaced frequencies

Deploying UMTS services on a non-standard bandwidth produces adjacent-frequency interference between GSM and UMTS. Therefore, small-spaced frequencies must be properly planned as recommended:

The BCCH is not configured on a small-spaced frequency. The BCCH must be configured on a GSM frequency that is spaced at least 2.6 MHz away from the UMTS center frequency.

The PDCH is not configured on a small-spaced frequency.

The frequency set configured for a GSM cell includes only one small-spaced frequency.

An anti-interference function is enabled on the small-spaced frequencies when the TCH is configured on these frequencies.

(Optional) TCH frequencies participate in RF hopping.

(Optional) When a UMTS cell has high capacity requirements, the GSM cells co-sited with the UMTS cell should not use the small-spaced frequencies.

Intra-frequency buffer zone

The UMTS network inside a refarming area uses frequencies that were previously used by the GSM network. Outside the refarming area, these frequencies are still used by the GSM network. The GSM and UMTS sites at the edge of the refarming area may experience co-channel interference because some frequencies are used by both networks. The GU intra-frequency buffer zone is introduced to minimize this interference, as shown in Figure 6-1.

Figure 6-1 GU intra-frequency buffer zone

As shown in Figure 6-1, area C (UMTS900) and area A (GSM900) can use the same frequencies, but area B (GSM900) cannot use the frequencies occupied by area C, to prevent co-channel interference. Area B is the intra-frequency buffer zone.

You can plan the intra-frequency buffer zone based on either coverage predictions or measurement reports (MRs).

Planning based on coverage predictions

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The intra-frequency buffer zone is preliminarily determined in the following four steps at the network planning stage:

1. Determine the interference thresholds.

2. Predict the UMTS coverage inside the refarming area.

3. Predict the GSM coverage outside the refarming area.

4. Combine the four intra-frequency buffer zones in the four directions.

The planning mode based on coverage predictions applies to all GU900 refarming scenarios.

Planning based on MRs

The intra-frequency buffer zone is optimized at the network optimization stage. The planning mode based on MRs can be used only when the GSM and UMTS networks share the same site and cover the same geographical area and the GSM and UMTS sites are planned by Huawei. If some sites are not planned by Huawei, but MRs of these sites can be correctly reported and parsed, this planning mode can also be used.

An MR includes the downlink receive level of the serving cell and six neighboring cells. Because the BTS transmit power and MS maximum transmit power are already known, the coupling loss from the BTS to the MS can be calculated. The interference in the four directions can be calculated, if the following conditions are met:

The uplink loss equals the downlink loss.

The NodeB receive power equals the receive power of the co-sited BTS.

The GSM cell that shares the same sector with the co-sited UMTS cell is the serving cell.

Cells that interfere with the serving cell are neighboring cells.

Based on the interference in the four directions and the interference level allowed in the four directions, the extent of the intra-frequency buffer zone can be determined.

Network Topology

None.

Hardware Planning

None.


RF Planning

RF planning for this feature is the same as that for the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature. See section 6.3.1 "2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8 MHz)."

Network Topology

None.

Hardware Planning

None.

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RF Planning

If the GSM Power Control on Interference Frequency for GU Small Frequency gap feature is enabled together with the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature or the Flexible frequency bandwidth of UMTS carrier feature, perform RF planning as described in section 6.3.1 "2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8 MHz)."

The Frequency Hopping (RF hopping, baseband hopping) feature must be enabled before you enable the GSM Power Control on Interference Frequency for GU Small Frequency gap feature.

Network Topology

None.

Hardware Planning

None.

6.4 Deploying 2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8 MHz)

6.4.1 Deployment Requirements

Optimized Huawei III Power Control Algorithm and DTX must have been enabled.


Licenses have been obtained for the following features, as listed in Table 6-4:

MRFD-211703 2.0MHz Central Frequency point separation between GSM and UMTS mode(GSM)

MRFD-221703 2.0MHz Central Frequency point separation between GSM and UMTS mode(UMTS)

Table 6-4 License information

NE License Control Item Abbreviation Code Sales Unit

BSC 2.0MHz Central Frequency point separation between GSM and UMTS mode(GSM)

LGW1GUCFS 82202149 Per site

NodeB 2.0MHz Central Frequency point separation between GSM and UMTS mode(UMTS)

LQW9GUCFS01 82202074 Per site

6.4.2 Data Preparation

Table 6-5 describes the parameters required for this feature.

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Table 6-5 Required parameters

Parameter Name Parameter ID Description Data Source

Frequency Min Bandwidth

FMBWH Minimum effective bandwidth of the UMTS carrier. This parameter can be set to 3800, 4200, or 4600.

3800 indicates that the UMTS network uses a 3.8 MHz static filter.



In GU refarming 3.8 MHz scenarios, this parameter is set to 3800. In GU refarming 4.2 MHz scenarios, this parameter is set to 4200.

Network plan

6.4.3 Precautions

The following hardware requirements must be met:

The GSM and UMTS networks are deployed by the same telecom operator and both networks use Huawei equipment. The GSM and UMTS networks share the same site, the same BBU, or the same multi-mode RF units.

The NodeB RF unit is any of the following:

MRxU900M V2V3, including RRU3908 V2 900M, MRFU V2 900M, RRU3928 900M, RRU3929 900M, and MRFUd 900M

MRRU850M V2, including RRU3908 V2 850M

RRU3908 V1 900M

6.4.4 Hardware Adjustment

None.

6.4.5 Initial Configuration

This feature must be enabled in all UMTS cells in the refarming area except the intra-frequency buffer zone.

Step 1 Run the NodeB MML command SET FREQBWH with FMBWH(the parameter name on the CME is Frequency Min Bandwidth) set to 3800 on the LMT.

SET FREQBWH: CN=0, SRN=60, SN=0, FMBWH=3800;

You can also perform the following steps on the CME to enable this feature:

Step 1 Click Main View.

Step 2 . Right-click the target Cell and choose device panel > RXU Topology > TOPO.

Step 3 Click the target RRU and set Frequency Min Bandwidth to 3800.

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If telecom operators do not purchase the license for the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature, the setting of FMBWH will not take effect on the RF units. Under this circumstance, ALM-26811 Configured Capacity Limit Exceeding Licensed Limit is reported.

6.4.6 Activation Observation

Step 1 Run the NodeB MML command DSP LICENSE to query whether the license for this feature has been activated.

DSP LICENSE:;

Step 2 Run the NodeB MML command LST FREQBWH to check whether FMBWH is set to 3800.

LST FREQBWH: CN=0, SRN=60, SN=0;

6.4.7 Additional Configuration

None.

6.4.8 Deactivation

Run the NodeB MML command SET FREQBWH with FMBWH set to 5000.

6.5 Deploying Flexible Frequency Bandwidth of UMTS Carrier (GU Refarming 4.2 MHz)

GU 900 MHz Non-standard Frequency Spacing includes only the GU refarming 4.2 MHz function in the Flexible frequency bandwidth of UMTS carrier feature.


The NodeB has been configured with the license for this feature, as listed in Table 6-6.



NodeB the number of NodeBs with flexible frequency separation function enabled

LQW9FLXFS01 82201196 NodeB


Data preparation for this feature is the same as that for the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature. See section 6.4.2 "Data Preparation."

6.5.3 Precautions

None.


None.

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Step 1 Run the NodeB MML command SET FREQBWH with FMBWH(the parameter name on the CME is Frequency Min Bandwidth) set to 4200 on the LMT.

SET FREQBWH: CN=0, SRN=60, SN=0, FMBWH=4200;



Step 2 . Right-click the target Cell and choose device panel > RXU Topology > TOPO.

Step 3 Click the target RRU and set Frequency Min Bandwidth to 4200.


Step 1 Run the NodeB MML command DSP LICENSE command to query whether the license for this feature has been activated.

DSP LICENSE:;

Step 2 Run the NodeB MML command LST FREQBWH to check whether FMBWH is set to 4200.

LST FREQBWH:;


None.

6.6 Deploying GSM Power Control on Interference Frequency for GU Small Frequency Gap


The licenses have been activated for the following features, as listed in Table 6-7.

MRFD-211804 GSM Power Control on Interference Frequency for GU Small Frequency gap (GSM)

MRFD-221804 GSM Power Control on Interference Frequency for GU Small Frequency gap (UMTS) must have been obtained.



BSC GSM Power Control on Interference Frequency for GU Small Frequency gap(GSM)

LGW1GPCGSFG 82203143 Per site

NodeB GSM Power Control on Interference Frequency for GU Small Frequency gap(UMTS)

LQW9GSMPC01 82202824 Per site

The Frequency Hopping (RF hopping, baseband hopping) feature must be enabled before you enable the GSM Power Control on Interference Frequency for GU Small Frequency gap feature. FH must be considered during refarming.

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Table 6-8 describes the parameters required for this feature.

Table 6-8 Required parameters

Parameter Name

Parameter ID Description Data Source

Cell Index CELLID Cell in which frequency-based power control is enabled

Network plan

Frequency-based Power Control

GUDegratePwrCtrl Whether to enable frequency-based power control

Network plan

Interference Coordination Policy

GUDegratePwrPri Frequency-based power control policy.

When this parameter is set to GSM(GSM), this feature guarantees the GSM network quality while minimizing interference to the UMTS network. If the non-interfering frequencies do not obtain sufficient power compensation, the transmit power of the interfering frequency cannot be minimized.

When this parameter is set to UMTS(UMTS), this feature preferentially guarantees the UMTS network quality. Even if the non-interfering frequencies do not obtain sufficient power compensation, the transmit power of the interfering frequency can be minimized.

Network plan

GU2.0 MHz Max. Power Decrease for Interfering Frequency

GU2000KHzMaxVal Maximum decrease in the transmit power of the interfering frequency when there is a 2.0-MHz frequency spacing between the GSM and UMTS networks. The desired transmit power of the interfering frequency that is spaced 2.0 MHz away from the UMTS center frequency is equal to the maximum TRX transmit power minus the value of this parameter.

Network plan

GU2.2 MHz Max. Power Decrease for Interfering Frequency

GU2200KHzMaxVal Maximum decrease in the transmit power of the interfering frequency when there is a 2.2-MHz frequency spacing between the GSM and UMTS networks. The desired transmit power of the interfering frequency that is spaced 2.2 MHz away from the UMTS center frequency is equal to the maximum TRX transmit power minus the value of this parameter.

Network plan

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Parameter Name

Parameter ID Description Data Source

UMTS Center Frequency 1

UMTSFreqNum1 Downlink ARFCN for the first UMTS frequency that has a 2.0-MHz or 2.2-MHz spacing with the GSM frequency in GU refarming scenarios.

Network plan

UMTS Center Frequency 2

UMTSFreqNum2 Downlink ARFCN for the second UMTS frequency that has a 2.0-MHz or 2.2-MHz spacing with the GSM frequency in GU refarming scenarios.

Network plan

Non-AHR Power Compensation Proportion

NAHRCompCoeff Proportion of power compensation for the non-interfering frequencies to power decrease each time the transmit power of the interfering frequency is decreased by 1 dB for enhanced full rate (EFR), full rate (FR), half rate (HR), and adaptive multirate (AMR) FR calls. When this parameter is set to 0, power compensation is not performed on the non-interfering frequencies.

Network plan

Non-AHR Power Compensation Offset

NAHRCompOffVal Power compensation offset for EFR, FR, HR, and AMR FR calls. This parameter is used to calculate the power compensation for the non-interfering frequencies.

Network plan

AHR Power Compensation Proportion

AHRCompCoeff Proportion of power compensation for the non-interfering frequencies to power decrease each time the transmit power of the interfering frequencies is decreased by 1 dB for AMR HR calls. When this parameter is set to 0, power compensation is not performed on the non-interfering frequencies.

Network plan

AHR Power Compensation Offset

AHRCompOffVal Power compensation offset for AMR HR calls. This parameter is used to calculate the power compensation for the non-interfering frequencies.

Network plan

6.6.3 Precautions

The Frequency Hopping (RF hopping, baseband hopping) feature must be enabled before you enable the GSM Power Control on Interference Frequency for GU Small Frequency gap feature.


None.

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The GSM Power Control on Interference Frequency for GU Small Frequency gap feature can be enabled in all GSM cells in the refarming area except the intra-frequency buffer zone.

Step 1 To enable this feature, run the MML command SET GCELLNONSTANDARDBW on the BSC side to set GUDegratePwrCtrl to ON and set the parameters of GU2000KhzMaxVal or GU2200KhzMaxVal, UMTSFreqNum1, NAHRCompCoeff, and NAHRCompOffVal.

SET GCELLNONSTANDARDBW: CELLID =9367, GUDegratePwrCtrl=ON, GUDegratePwrPri=GSM, GU2000KHzMaxVal = 10 ,

GU2200KHzMaxVal= 3 , UMTSFreqNum1=512, UMTSFreqNum2=1, NAHRCompCoeff= 5 , NAHRCompOffVal= -15 ,

AHRCompCoeff= 5 , AHRCOMPOFFVAL= -15;

MML Parameter ID Parameter Name on the CME

GUDegratePwrCtrl Frequency-based Power Control

GU2000KhzMaxVal GU2.0 MHz Max.Power Decrease for Interfering frequency

GU2200KhzMaxVal GU2.2 MHz Max.Power Decrease for Interfering frequency

UMTSFreqNum1 UMTS Center Frequency 1

NAHRCompCoeff Non-AHR Power Compensation Proportion

NAHRCompOffVal Non-AHR Power Compensation Offset



Step 2 . Right-click the target Cell and choose Cell Configuration Express > Properties > GSM/UMTS small Bandwidth interference Control parameters.

Step 3 Set Frequency-based Power Control to ON.


Use the following method to determine whether the GSM Power Control on Interference Frequency for GU Small Frequency gap feature has been activated:

Step 1 Check the counters related to this feature. When this feature is enabled, the counter values are not zero. Table 6-9 lists the counters related to this feature.

Table 6-9 Related counters

Counter ID Counter Name Counter Description

1282449360 CELL.2MDISTURB.AVG.FALL.POWER.RANGE

S3936U: Average Power Decrease on GSM 2.0 MHz Interfering Frequency

1282449361 CELL.2.2MDISTURB.AVG.FALL.POWER.RANGE

S3936V: Average Power Decrease on GSM 2.2 MHz Interfering Frequency

1282449362 CELL.UNDISTURB.AVG.UP.POWER.RANGE

S3936W: Average Power Increase on GSM Non-Interfering Frequency

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The value of a counter listed in Table 6-9 is zero only in the following scenarios:

GUDegratePwrPri is set to GSM(GSM) and all UEs receive data with full power.

There is no traffic on the network.


None.

6.7 Performance Optimization


This feature has the following impacts on network performance:

HSUPA performance is improved.

UMTS traffic volume increases, and the traffic absorption capability of the UMTS cell is improved.

GSM traffic volume decreases, and the GSM network quality remains unchanged.

This section describes only the KPIs affected by this feature. For further details, see sections 5.1.1 "Impact on System Capacity" and 5.1.2 "Impact on Network Performance."

Monitoring

To monitor feature performance, observe the counters listed in Table 6-10.

Table 6-10 Feature performance counters

Counter ID Counter Name Counter Description Formula Mode

1278087422 CELL.KPI.SD.TRAF.ERL K3004:Traffic Volume on SDCCH

None. GSM Counters

1278087438 CELL.KPI.TCH.TRAF.ERL.TRAF

K3014:Traffic Volume on TCH

None.

1278087448 CELL.KPI.TCH.CONGESTION.RATE

K3045:Congestion Rate on TCH (All Channels Busy)

None.

1278087444 CELL.TCH.SEIZ.SUCC.RATE

K3043:TCH Seizure Success Rate

None.

1278087433 CELL.KPI.TCH.STATIC.DROPS.TRAF

K3012A:Call Drops on TCH in Stable State (Traffic Channel)

CELL.KPI.TCH.STATIC.DROPS.TRAF/CELL.KPI.TCH.SUCC

1278087447 CELL.KPI.TCH.SUCC K3040:Successful TCH Seizures

1278288417 TRX.FR.DOWN.RX.QLTY.0.NEW

NCS412A:Number of MRs on Downlink TCHF (Receive

SUM(TRX.FR.DOWN.RX.QLTY.0-2.NEW)/

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Quality Rank 0) SUM(TRX.FR.DOWN.RX.QLTY.0-7.NEW) 1278288418 TRX.FR.DOWN.RX.QLTY

.1.NEW NCS412B:Number of MRs on Downlink TCHF (Receive Quality Rank 1)


NCS412C:Number of MRs on Downlink TCHF (Receive Quality Rank 2)


NCS412D:Number of MRs on Downlink TCHF (Receive Quality Rank 3)


NCS412E:Number of MRs on Downlink TCHF (Receive Quality Rank 4)

SUM(TRX.FR.DOWN.RX.QLTY.6-7.NEW)/ SUM(TRX.FR.DOWN.RX.QLTY.0-7.NEW) 1278288422 TRX.FR.DOWN.RX.QLTY

.5.NEW NCS412F:Number of MRs on Downlink TCHF (Receive Quality Rank 5)


NCS412G:Number of MRs on Downlink TCHF (Receive Quality Rank 6)


NCS412H:Number of MRs on Downlink TCHF (Receive Quality Rank 7)

1278077526 CELL.INTRABSC.HO.SUCC.RATE

RH303B:Intra-BSC Handover Success Rate

None.

1278077527 CELL.INTRABSC.RD.HO.SUCC.RATE

RH303C:Intra-BSC Radio Handover Success Rate

None.

67202932 VS.HSDPA.UE.Mean.Cell Average Number of HSDPA UEs in a Cell

None. UMTS Counters

67179827 VS.RAB.SuccEstabCS.Conv

Number of Successful CS Conversational RAB Establishments

[(VS.RAB.SuccEstabCS.Conv +

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for Cell VS.RAB.SuccEstabCS.Str)/ (VS.RAB.AttEstabCS.Conv + VS.RAB.AttEstabCS.Str)] x 100%

67179828 VS.RAB.SuccEstabCS.Str Number of Successful CS Streaming RAB Establishments for Cell

67179825 VS.RAB.AttEstabCS.Conv Number of CS Conversational RAB Establishment Requests for Cell

67179826 VS.RAB.AttEstabCS.Str Number of CS Streaming RAB Establishment Requests for Cell

67179925 VS.RAB.SuccEstabPS.Conv

Number of Successful PS Conversational RAB Establishments for Cell

[(VS.RAB.SuccEstabPS.Conv + VS.RAB.SuccEstabPS.Str + VS.RAB.SuccEstabPS.Inc + VS.RAB.SuccEstabPS.Bkg)/ (VS.RAB.AttEstabPS.Conv + VS.RAB.AttEstabPS.Str + VS.RAB.AttEstabPS.Inc + VS.RAB.AttEstabPS.Bkg)] x 100%

67179926 VS.RAB.SuccEstabPS.Str Number of Successful PS Streaming RAB Establishments for Cell

67179927 VS.RAB.SuccEstabPS.Inc Number of Successful PS Interactive RAB Establishments for Cell

67179928 VS.RAB.SuccEstabPS.Bkg

Number of Successful PS Background RAB Establishments for Cell

67179921 VS.RAB.AttEstabPS.Conv Number of PS Conversational RAB Establishment Attempts for Cell

67179922 VS.RAB.AttEstabPS.Str Number of PS Streaming RAB Establishment Attempts for Cell

67179923 VS.RAB.AttEstabPS.Inc Number of PS Interactive RAB Establishment

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Attempts for Cell

67179924 VS.RAB.AttEstabPS.Bkg Number of PS Background RAB Establishment Attempts for Cell

67179781 VS.RAB.AbnormRel.PS(none)

Number of PS RABs Abnormally Released for Cell

VS.RAB.AbnormRel.PS(none)/(VS.RAB.AbnormRel.PS(none) + VS.RAB.NormRel.PS(none))

67179782 VS.RAB.NormRel.PS(none)

Number of PS RABs Normally Released for Cell

67179778 VS.RAB.AbnormRel.CS(none)

Number of CS RABs Abnormally Released for Cell

VS.RAB.AbnormRel.CS(none)/(VS.RAB.AbnormRel.CS(none) + VS.RAB.NormRel.CS(none))

67179779 VS.RAB.NormRel.CS(none)

Number of CS RABs Normally Released for Cell

67180498 VS.SHO.AttRLAdd(none) Number of Radio Link Addition Attempts in Soft Handover for Cell

(VS.SHO.SuccRLAdd(none) + VS.SHO.SuccRLDel(none))/ (VS.SHO.AttRLAdd(none) + VS.SHO.AttRLDel(none))

67180490 VS.SHO.AttRLDel(none) Number of Radio Link Deletion Attempts in Softer Handover for Cell

67180499 VS.SHO.SuccRLAdd(none)

Number of Successful Radio Link Additions in Soft Handover for Cell

67180491 VS.SHO.SuccRLDel(none)

Number of Successful Radio Link Deletions in Softer Handover for Cell

67189754 IRATHO.AttOutCS(none) Number of Successful Radio Link Deletions in Softer Handover for Cell

(IRATHO.SuccOutCS(none)/ IRATHO.AttOutCS(none)) x 100%

67189755 IRATHO.SuccOutCS(none)

Number of Successful CS Outgoing Inter-RAT Handovers for Cell

67203850 VS.HSUPA.UE.Mean.Cell Average Number of HSUPA UEs in a Cell

None.

67203932 VS.HSUPA.MeanChThrou Mean Uplink None.

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6-18


ghput Throughput of single HSUPA MAC-d Flow for Cell

Parameter Optimization

1. Mitigate the decrease in GSM MOS and EDGE throughput.

The following parameters were added to mitigate the decrease in GSM MOS and EDGE throughput:

Signal level parameters: DLREXLEVHIGHTHRED, ULREXLEVHIGHTHRED, DLREXLEVADJFCTR, and ULREXLEVADJFCTR

Quality parameters: DLFSREXQUALHIGHTHRED, ULFSREXQUALHIGHTHRED, DLREXQUALADJFCTR, and ULREXQUALADJFCTR

Adding the preceding parameters increases the average transmit power of the BTS. If necessary, reconfigure the parameters in the sequence listed.

2. Mitigate HSDPA performance deterioration.

Perform the following operations to mitigate HSDPA performance deterioration:

Enable the GSM Power Control on Interference Frequency for GU Small Frequency gap feature.

Decrease the values for DLREXLEVHIGHTHRED and DLREXLEVADJFCTR.

Decrease the values for DLFSREXQUALHIGHTHRED and DLREXQUALADJFCTR.

The preceding operations decrease the BTS transmit power and consequently lead to GSM receive quality deterioration. If necessary, reconfigure the parameters in the sequence listed.

For details about how to enable the GSM Power Control on Interference Frequency for GU Small Frequency gap feature, see section 6.6.5 "Initial Configuration."

3. Mitigate HSUPA performance deterioration.

Perform the following operations to mitigate HSUPA performance deterioration:

Enable the Anti-Interference Scheduling for HSUPA feature on the NodeB.

Decrease the values for ULREXLEVHIGHTHRED and ULREXLEVADJFCTR.

Decrease the values for ULFSREXQUALHIGHTHRED and ULREXQUALADJFCTR.

The preceding operations decrease the BTS transmit power and consequently lead to GSM receive quality deterioration. If necessary, reconfigure the parameters in the sequence listed.


Monitoring

GSM MOS and EDGE throughput in GU refarming 4.2 MHz scenarios are less than 5% lower than those in GU refarming 5 MHz scenarios. Use either of the following methods to monitor the performance of this feature:

Observe the counters related to this feature.

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6-19

The counters are the same as those related to the 2.0MHz Central Frequency point separation between GSM and UMTS mode feature.

Perform drive tests (DTs) in the following scenarios:

The performance of HSDPA category 8 UEs is deteriorated by less than 5% after this feature is enabled.

The performance of HSUPA category 6 UEs is deteriorated by less than 5% after this feature is enabled.

HSPA+ services such as 64QAM produce a gain of 3% compared with HSPA services.

Parameter Optimization

See section 6.7.1 "2.0MHz Central Frequency Point Separation Between GSM and UMTS Mode (GU Refarming 3.8 MHz)."


This section describes how to monitor and optimize the performance of the GSM Power Control on Interference Frequency for GU Small Frequency Gap feature. The parameter optimization operations are mainly performed to improve the affected KPIs described in section 5.3.1 "Impact on System Capacity". For details, see sections 5.3.1 "Impact on System Capacity", 5.3.2 "Impact on Netw

gu 900 mhz non-standard frequency spacing(sran7.0_01)

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