GSM Dynamic Power Sharing-Feature Parameter Description

GSM Dynamic Power Sharing GBSS13.0

Feature Parameter Description

Issue 02

Date 2012-06-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright Huawei Technologies Co., Ltd. 2012. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

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and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

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the customer. All or part of the products, services and features described in this document may not be

within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,

information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

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Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

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Website: http://www.huawei.com

Email: [email protected]

GSM BSS

GSM Dynamic Power Sharing Contents

Issue 02 (2012-06-30) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i

Contents

1 About This Document ......................................................................................................... 1-1

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

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

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

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

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

3.1 Process of Dynamic Power Sharing.......................................................................................... 3-1

3.2 Initial Channel Allocation .......................................................................................................... 3-2

3.3 Handover Triggered by Insufficient Downlink Power.................................................................. 3-2

3.4 Handover Preventing a High-Level Uplink Signal from Overwhelming a Low-Level Uplink Signal ...................................................................................................................................................... 3-3

3.5 Peak Clipping on Activated Channels ....................................................................................... 3-3

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

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

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

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

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

6.1 When to Use Dynamic Power Sharing ...................................................................................... 6-1

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

6.3 Network Planning ..................................................................................................................... 6-2

6.4 Deploying Dynamic Power Sharing........................................................................................... 6-2

6.5 Performance Optimization ........................................................................................................ 6-2

6.6 Troubleshooting ....................................................................................................................... 6-4

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

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

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

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

GSM BSS

GSM Dynamic Power Sharing 1 About This Document



1-1

1 About This Document

1.1 Scope

This document describes the GBFD-118106 Dynamic Power Sharing feature, including its functions and technical mechanisms. Technical mechanisms include initial channel allocation, handover triggered by insufficient downlink power, handover preventing a high-level uplink signal from overwhelming a low-level uplink signal, and peak clipping on activated channels.

1.2 Intended Audience

This document is intended for:

Personnel who need to understand the Dynamic Power Sharing feature

Personnel who work with Huawei GSM products

1.3 Change History

The 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 Dynamic Power Sharing 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 issues are as follows:

02 (2012-06-30)

01 (2011-03-31)

Draft A (2011-01-15)

02 (2012-06-30)

This is the second release of GBSS13.0.

Compared with issue 01 (2011-03-31), 02 (2012-06-30) incorporates the changes described in the following table.

Change Type

Change Description Parameter Change

Feature change

None None

Editorial change

Added the following chapters:

Chapter 4 Related Features

Chapter 5 Impact on the Network

Chapter 6 Engineering Guidelines

None

GSM BSS

GSM Dynamic Power Sharing 1 About This Document



1-2

01 (2011-03-31)

This is the first release of GBSS13.0.

Compared with issue Draft A (2011-01-15) of GBSS13.0, issue 01 (2011-03-31) of GBSS13.0 has no change.

Draft A (2011-01-15)

This is the draft release of GBSS13.0.

This is a new document.

GSM BSS

GSM Dynamic Power Sharing 2 Overview



2-1

2 Overview

The Dynamic Power Sharing feature maximizes cell coverage to meet the different power requirements of users distributed in different areas of a cell.

NOTE

Read the Channel Management Feature Parameter Description, Handover Feature Parameter Description, and Power Control Feature Parameter Description before reading this document.

Due to power control, users distributed in different areas of a cell require different transmit power to access the radio network. Generally, users near the BTS require low transmit power, and users far from the BTS require high transmit power.

This feature allocates calls requiring different power to appropriate timeslots based on certain rules. The power of each timeslot is shared by multiple carriers. This ensures that the maximum output power of certain channels is greater than the average available power of carriers, meeting the power requirements of users far from the BTS. Figure 2-1 shows the power sharing principle.

Figure 2-1 Power sharing principle

6

5

4

3

2

1

Power

Carrier

Average available power of carriers

When the user distribution in a cell changes dynamically, the dynamic transmit power of carriers enabled with this feature can be greater than the average available power of carriers. This increases the cell coverage without changing the power of the power amplifier (PA).

This feature includes the following functions:

Single-PA power sharing, for example, power sharing on the quadruple-transceiver unit (QTRU) and power sharing on a single channel of the multi-carrier remote radio unit (MRRU).

Dual-PA power sharing, for example, power sharing between two channels on the MRRU

Inter-module power sharing, for example, power sharing between two GSM radio frequency units (GRFUs)

The algorithms for these functions are the same.

GSM BSS

GSM Dynamic Power Sharing 3 Technical Description



3-1

3 Technical Description

3.1 Process of Dynamic Power Sharing

The Dynamic Power Sharing feature is activated when QTRUPWRSHARE is set to DYNAMIC(Dynamic power sharing).

Figure 3-1 shows the process of Dynamic Power Sharing.

Figure 3-1 Process of Dynamic Power Sharing

Call Access Phase

The BSC allocates an initial channel to a call according to the power required by the call and the remaining power on a timeslot occupied by an idle channel.

Call Stable Phase

When a call enters the stable phase, the BSC monitors timeslot power every 0.5 second. Based on the monitoring results, the BSC determines whether to perform:

Handover due to downlink power insufficiency

When the current total power of a timeslot exceeds the maximum allowed transmit power of the timeslot, a call is handed over to another timeslot to avoid damage to PAs.

Handover preventing a high-level uplink signal from overwhelming a low-level uplink signal

When a timeslot is allocated to two calls that have a large difference in uplink signal strength, the call with a higher-level uplink signal is handed over to another timeslot to prevent affecting the call with a lower-level uplink signal.

Peak clipping on activated channels

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3-2

The total transmit power required by all calls in a timeslot may exceed the maximum power supported by the PA. When this occurs, peak clipping is performed on activated channels to avoid damage to radio frequency (RF) devices.

3.2 Initial Channel Allocation

During a call setup, the BSC allocates a proper channel according to the power required by the call.

1. Based on the value of CHPWRINSUFFALLOWED, the BSC determines whether to allocate an idle channel in a timeslot with insufficient remaining power to a newly initiated call.

When CHPWRINSUFFALLOWED is set to NO(No), the BSC will not allocate an idle channel in a timeslot with insufficient remaining power to a newly initiated call.

A timeslot is considered to have insufficient remaining power for a newly initiated call when the timeslot meets the following condition:

(Power required by the newly initiated call + Power required by all set up calls in the timeslot) > (Maximum output power of the PA + TSPWRRESERVE)

When CHPWRINSUFFALLOWED is set to YES(Yes), an idle channel in a timeslot with insufficient remaining power is allocated to a newly initiated call.

2. The BSC determines the priorities of idle channels based on the power required by the call and the remaining power on the timeslots occupied by the idle channels. Then, it allocates an idle channel with the highest priority to a newly initiated call.

When MCPAOPTALG is set to OFF(Off), the BSC determines the priorities of idle channels based on the remaining power of its timeslot.

When MCPAOPTALG is set to ON(No), the BSC determines the priorities of idle channels based on the number of idle channels in the timeslot and the remaining power of the timeslot.

When there is only one idle channel in a timeslot, the priority of the idle channel is negatively related to the absolute value of the difference between the remaining power of the timeslot and the power required by the newly initiated call.

When there is more than one idle channel in a timeslot, the priorities of the idle channels are positively related to the remaining power of the timeslot.

3.3 Handover Triggered by Insufficient Downlink Power

The BSC measures the total power of each timeslot every 0.5 second. If a timeslot has total power insufficiency for longer than a duration specified by QTRUDNPWRLASTTIME in the time specified by QTRUDNPWRSTATTIME, higher-power calls are handed over to another timeslot. The intra-cell handover is preferentially performed. If no timeslot in the cell meets the handover conditions, an inter-cell handover is performed.

Handover Triggering Conditions

A handover is performed when the following conditions are met:

The total power of the timeslot is insufficient. That is, Total power of the timeslot > Maximum output power of the PA + OUTHOPWROVERLOADTHRESHOLD

The P/N criterion is met. That is, the total power insufficiency of the timeslot lasts for a duration specified by QTRUDNPWRLASTTIME in the time specified by QTRUDNPWRSTATTIME.

Call-Specific Conditions for a Handover

The channel originally allocated to the call is not on a broadcast control channel (BCCH) carrier.

A full-rate call is preferentially handed over.

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3-3

A handover is preferentially performed for the call with the highest downlink power requirement among all calls allocated non-BCCH-carrier channels.

Target Cell Selection

The target channel of an intra-cell handover must meet the following requirement:

Power required by all activated channels in the same timeslot of the target channel + Power required by the call to be handed over Maximum output power of the PA + INHOPWROVERLOADTHRESHOLD

The target cell of an inter-cell handover must meet the following requirement:

Signal strength of the target cell Signal strength of the serving cell > INTERCELLHYST - BQMARGIN

3.4 Handover Preventing a High-Level Uplink Signal from Overwhelming a Low-Level Uplink Signal

If the uplink signal level difference between two calls exceeds 90 dB and the two calls occupy two channels in the same timeslot, the lower-level uplink signal will be overwhelmed by the higher-level signal. When this occurs, the quality of the call with the lower-level uplink signal will deteriorate and a call drop may occur. Therefore, calls with greatly different uplink signal levels must not be allocated to the same timeslot.

When QTRUCHANMANGSWITCH is set to YES(Yes), the BSC measures the difference between uplink signal levels every 0.5 second. If the highest uplink signal level of a timeslot is 90 dB higher than the uplink signal level reported by the current channel, the situation is recorded. If this situation lasts for a duration specified by UPRXLEVLASTTIME in the time specified by UPRXLEVSTATICTIME, higher-level calls are handed over to another timeslot.

3.5 Peak Clipping on Activated Channels

To ensure that a PA functions properly, the BTS performs peak clipping to reduce the transmit power of all calls on a timeslot when the total power of all calls on this timeslot exceeds the maximum output power of the PA.

Dynamic Power Sharing reduces the impact of peak clipping on call quality by properly allocating channels.

When the total downlink power required by all activated channels in a timeslot exceeds the total power of a PA, peak clipping is required for activated channels to avoid damage to RF devices. With peak clipping, some power of the activated channels is allocated to new calls. This ensures successful access of new calls and prevents overload of a timeslot (or instantaneous overload is allowed) while limiting the decrease in network quality.

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GSM Dynamic Power Sharing 4 Related Features



4-1

4 Related Features

Feature Prerequisite Feature

Mutually Exclusive Feature Affected Feature

Dynamic Power Sharing

GBFD-117601 HUAWEI III Power Control Algorithm

The single-PA power sharing function cannot be used together with any of the following features:

GBFD-117002 IBCA (Interference Based Channel Allocation)

GBFD-117001 Flex MAIO

GBFD-118701 RAN Sharing

GBFD-114001 Extended Cell

For the radio frequency unit (RFU), the dual-PA power sharing function cannot be used together with any of the following features:

GBFD-111602 TRX Power Amplifier Intelligent Shutdown


GBFD-113201 Concentric Cell

GBFD-114501 Co-BCCH Cell

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




For the remote radio unit (RRU), the dual-PA power sharing function cannot be used together with any of the following features:

GBFD-111602 TRX Power Amplifier Intelligent Shutdown


GBFD-113201 Concentric Cell

GBFD-115902 Transmit Diversity

GBFD-118101 Dynamic Transmit Diversity

GBFD-117002 IBCA



GBFD-510104 Multi-site Cell

GBFD-117602 Active Power Control

If the Dynamic Power Sharing feature has been enabled in a cell, you do not need to enable the Active Power Control feature because the Dynamic Power Sharing feature contains all of its functions.

GBFD-114801 Discontinuous Transmission (DTX)-Downlink

If power control parameters are not properly set, there will be a high percentage of high signal levels. When this occurs, network performance will not be improved even if Dynamic Power Sharing is enabled and the number of peak clipping attempts is minimized. Therefore, set downlink power control parameters to appropriate values and enable the DTX function before enabling Dynamic Power Sharing.

GSM BSS

GSM Dynamic Power Sharing 5 Impact on the Network



5-1

5 Impact on the Network

5.1 Impact on System Capacity

The Dynamic Power Sharing feature improves network coverage and network capacity.

5.2 Impact on Network Performance

If the power of a timeslot is insufficient after this feature is enabled, the BSC hands over calls on this timeslot to other timeslots. This increases the number of handovers in a cell.

When the power required by a call on the timeslot exceeds the maximum transmit power of a transceiver (TRX) module, the TRX module performs peak clipping. This may decrease the PS throughput, increase the call drop rate, and reduce the mean opinion score (MOS).

GSM BSS

GSM Dynamic Power Sharing 6 Engineering Guidelines



6-1

6 Engineering Guidelines

6.1 When to Use Dynamic Power Sharing

When the sites or cells involved in network swap do not meet the requirements in Table 6-1, use static power because the Dynamic Power Sharing feature will negatively affect the key performance indicators (KPIs) of the network.

When the sites or cells involved in network swap meet the requirements in Table 6-1 and static power cannot meet the power requirement of the original network, enable this feature.

If the cell cabinet-top power is lower than the static power before network swap, do not enable this feature after network swap. Instead, adjust the power configuration based on the static power. This is to ensure that the power before the network swap matches that after the network swap and to ensure that the network quality does not decline after the network swap.

Table 6-1 Dynamic power sharing requirements for sites and cells

Percentage of PDCHs and SDCCHs

Frequency Resource Load

Distance Between Sites (km)

Traffic Volume on Each Channel (Erl)

30% 40% < 0.8 < 0.70

0.8 to 1.5 < 0.65

1.5 to 2 < 0.63

2 to 3 < 0.57

> 3 < 0.50

< 40% < 1 < 0.70

1 to 1.5 < 0.68

1.5 to 2 < 0.64

2 to 3 < 0.57

> 3 < 0.50

Method of Calculating FR Load

In 1x3 frequency reuse mode, the frequency resource load (FR load) of the network is the ratio of the number of TRXs to the number of frequencies available for frequency hopping. In other frequency reuse modes, the FR load is calculated as an equivalent of the FR load in 1x3 frequency reuse mode. The method of calculating the FR load is as follows:

1. Obtain the frequency planning principle and calculate the total number of available frequencies.

Generally, BCCHs adopt loose frequency reuse and TCHs adopt tight frequency reuse. Therefore, the FR load only needs to be calculated TCHs, which means that the number of BCCH frequencies needs to be subtracted from the total number of available frequencies.

2. Calculate the number of TRXs in each cell based on network engineering parameters, and obtain the number of BCCH frequencies that needs to be subtracted from the total number of available frequencies.

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6-2

The following formula is used to calculate the FR load for a cell: FR load = (Number of TRXs -1)/(Number of available TCH frequencies/3)

For example:

In a network that uses baseband frequency hopping and 94 frequencies of P-GSM 19 MHz, the BCCH adopts the 6x3 frequency reuse mode with two protective frequencies. No frequency is reserved for indoor coverage.

If there are seven TRXs in a cell, the FR Load of the cell is calculated as follows:

FR load = (7 1)/{[94 (6 x 3 + 2)/3]} = 24.3%

Method of Calculating the Distance Between Sites

Calculate the distance between a site and its nearest neighboring site based on their longitudes and latitudes.

The detailed calculation method is as follows (when the following conditions are met):

The longitudes and latitudes of the two sites are (Lon1, Lat1) and (Lon2, Lat2).

x = (Lon2 - Lon1) x x R x Cos{[(Lat1 + Lat2) / 2] x / 180} / 180

y = (Lat2 - Lat1) x x R / 180

Then, the distance between the sites is: 1000/xDistance 22 y

Where, R (radius of the Earth) = 6.371229 x 1000000 and = 3.14159265.

Method of Calculating the Traffic Volume on Each Channel of a Cell

Traffic volume on each channel of a cell = Traffic Volume on TCH/Available TCHs

This formula is used to calculate the traffic volume on each channel of a Huawei GSM cell. The counters Traffic Volume on TCH and Available TCHs in the formula can be extracted from BSC traffic statistics. If you want to calculate the traffic volume on each channel of a cell from other vendors, obtain the appropriate formulas.

6.2 Information to Be Collected

Obtain the maximum output power of TRX modules in a cell, the number of carriers configured on each TRX module, and the power of each carrier to determine whether to enable this feature. If the total power of all carriers configured on a TRX module exceeds the maximum output power of the TRX module, enable this feature. Otherwise, do not enable this feature.

6.3 Network Planning

N/A

6.4 Deploying Dynamic Power Sharing

For details about how to activate, verify, and deactivate this feature, see Configuring Dynamic Power Sharing.

6.5 Performance Optimization

Monitoring

After enabling the Dynamic Power Sharing feature, observe the counters listed in Table 6-2.

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Table 6-2 Counters to be observed after enabling Dynamic Power Sharing

Category Counter Counter ID

Assignment and access

Number of Times Power OverLoad CELL.PWR.OVERLOAD.TIMES

Number of TCH Allocation Failures (Power Deficit)

CELL.TCH.ALLOC.FAIL.TIMES.PWR.OVERLOAD

Peak clipping

Number of Timeslots with Power Decreased by 0.5 dB

TRX.CUT.05DB.POWER.TIMES









Number of Timeslots with Power Decreased by 3.0 dB or Higher


Handovers due to power insufficiency

Number of Handover Requests due to Power Deficit

CELL.PWR.OVERLOAD.HO.REQ.TIMERS

Number of Successful Handovers due to Power Deficit

CELL.PWR.OVERLOAD.HO.SUC.TIMERS

Number of Handover Commands due to Power Deficit

CELL.PWR.OVERLOAD.HO.CMD.TIMERS

Parameter Optimization

After this feature is enabled, pay attention to KPIs such as call drop rates, handover success rates, assignment success rates, and congestion rates.

Assignment and access

If the congestion rate increases after this feature is enabled, check whether the increase is caused by an increase in the proportions of the counters Number of Times Power OverLoad and Number of TCH Allocation Failures (Power Deficit). If so, set CHPWRINSUFFALLOWED to YES(Yes).

Peak clipping

If Number of MRs on Downlink TCH (Mean Receive Quality Rank 6) and Number of MRs on Downlink TCH (Mean Receive Quality Rank 7) increase notably after this feature is enabled, observe the following counters:






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6-4

Number of Timeslots with Power Decreased by 3.0 dB or Higher

The number of peak clipping times is an indication of the power sharing effect. If the number of peak clipping times increases, check whether channel configuration and power control parameters have been adjusted, and continue to observe handover counters related to power insufficiency.

Handovers due to power insufficiency

Counters of this type indicate the number of handovers due to power insufficiency and the success rate of such handovers.

If excess handovers are performed due to power insufficiency and the handover success rate is low, the overall handover success rate may decrease. In this case, decrease the value for OUTHOPWROVERLOADTHRESHOLD and increase the value for INHOPWROVERLOADTHRESHOLD.

If only a few handovers are performed due to power insufficiency, peak clipping may be triggered too many times. In this case, increase the value for OUTHOPWROVERLOADTHRESHOLD and decrease the value for INHOPWROVERLOADTHRESHOLD.

6.6 Troubleshooting

N/A

GSM BSS

GSM Dynamic Power Sharing 7 Parameters



7-1

7 Parameters

Table 7-1 Parameter description

Parameter ID NE MML Command Feature ID Feature Name Description

BQMARGIN BSC6900 ADD G2GNCELL(Optional)

MOD G2GNCELL(Optional)

GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: Difference between the downlink receive level of the serving cell and that of a neighboring cell during bad quality handovers. This parameter is used to calculate the bad quality handover hysteresis based on the following formula:

Bad quality handover hysteresis = Value of "INTERCELLHYST" -Value of this parameter

Bad quality handovers to a neighboring cell can be triggered when the following condition is met:

(Downlink receive level of the neighboring cell after filtering - Downlink receive level of the serving cell after power control compensation) > (Value of "INTERCELLHYST " - 64) - (Value of this

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parameter - 64). The actual value of this parameter is equal to the GUI value minus 64.

GUI Value Range: 0~127

Actual Value Range: -64~63

Default Value: 69

Unit: dB

CHPWRINSUFFALLOWED

BSC6900 SET GCELLCHMGAD(Optional)

GBFD-111005

GBFD-118106

Enhanced Channel Assignment Algorithm


Meaning: Whether to allow a multi-density TRX board, that uses the dynamic power sharing algorithm to assign channels, to assign a channel to an MS when the remaining power on the multi-density TRX board is less than the power required by the MS. If this parameter is set to YES, a multi-density TRX board that uses the dynamic power sharing algorithm to assign channels cannot assign a channel to an MS when the remaining power on the multi-density TRX board is less than the

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power required by the MS.If this parameter is set to NO, a multi-density TRX board that uses the dynamic power sharing algorithm to assign channels can assign a channel to an MS when the remaining power on the multi-density TRX board is less than the power required by the MS.

GUI Value Range: NO(No), YES(Yes)

Actual Value Range: NO, YES

Default Value: YES

Unit: None

INHOPWROVERLOADTHRESHOLD

BSC6900 SET GTRXDEV(Optional)

GBFD-111005

GBFD-118106



Meaning: Power overload threshold for triggering incoming handover to the TRX under the prerequisite that the power amplifier of the TRX provides the maximum output power.


Actual Value Range: 0~50

Default Value: 8

Unit: W

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INTERCELLHYST BSC6900 ADD G2GNCELL(Optional)

MOD G2GNCELL(Optional)

GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: Hysteresis value during the handovers between cells, This value is used to suppress ping-pong handovers between cells. The actual value of this parameter is equal to the GUI value minus 64.


Actual Value Range: -64~63

Default Value: 68

Unit: dB

MCPAOPTALG BSC6900 SET GCELLCHMGAD(Optional)

GBFD-111005

GBFD-118106



Meaning: If the MCPA Optimization Switch is turned on, the MCPA priority update mode is adjusted.

GUI Value Range: OFF(Off), ON(On)

Actual Value Range: ON, OFF

Default Value: OFF

Unit: None

OUTHOPWROVERLOADTHRESHOLD

BSC6900 SET GTRXDEV(Optional)

GBFD-111005

GBFD-118106



Meaning: Power overload threshold for triggering outgoing handover from the TRX under the prerequisite

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7-5


that the power amplifier of the TRX provides the maximum output power. If the power overload exceeds this threshold, the TRX triggers outgoing handover for lack of power.



Default Value: 15

Unit: W

QTRUCHANMANGSWITCH

BSC6900 SET GCELLSOFT(Optional)

GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: This parameter is used to avoid allocating the calls whose signal strengths differ greatly to the same timeslot.

The BSC measures the signal merge conditions on each timeslot every 0.5 seconds. If the difference between the highest signal strength and the lowest signal strength on a timeslot is greater than the value of "UL Signal Strength Difference Threshold", it regards it as a signal merge event.

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If N signal merge events are consecutively detected among P times of measurements, the forcible intra-cell handover is triggered to switch the call with the highest signal strength to another timeslot in the cell.

Here, N indicates "UL Signal Strength Difference Detections", P indicates "UL Signal Strength Difference Maintains".

GUI Value Range: NO(Close), YES(Open)

Actual Value Range: NO, YES

Default Value: NO

Unit: None

QTRUDNPWRLASTTIME


GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: The P/N criteria is used to determine low downlink power for multi-density carriers. If the downlink power of a multi-density carrier remains low during a consecutive P seconds out of N seconds, the

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downlink power of the multi-density carrier is considered low. This parameter corresponds to the P in the P/N criteria.



Default Value: 3

Unit: s

QTRUDNPWRSTATTIME


GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: The P/N criteria is used to determine low downlink power for multi-density carriers. If the downlink power of a multi-density carrier remains low during a consecutive P seconds out of N seconds, the downlink power of the multi-density carrier is considered low. This parameter corresponds to the N in the P/N criteria.



Default Value: 5

Unit: s

QTRUPWRSHARE BSC6900 SET GCELLCHMGAD(Optional)

GBFD-111005

GBFD-118106


Meaning: Whether to use the statistical multiplexing

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algorithm for multi-density power

GUI Value Range: NONE(None), DYNAMIC(Dynamic power sharing)

Actual Value Range: NONE, DYNAMIC

Default Value: NONE

Unit: None

TSPWRRESERVE BSC6900 SET GTRXDEV(Optional)

GBFD-111005

GBFD-118106



Meaning: Maximum degree by which the output power of the multi-density TRX board can exceed the maximum output power within a short time



Default Value: 20

Unit: W

UPRXLEVLASTTIME BSC6900 SET GCELLCHMGAD(Optional)

GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: If the difference between uplink receive levels of calls within the same timeslot is greater than "Offset of the difference between uplink received levels" for P seconds among N seconds, the call with weak uplink receive

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level within the timeslot will be handed over to another timeslot. This parameter corresponds to P in the P/N criterion.



Default Value: 4

Unit: s

UPRXLEVSTATICTIME


GBFD-110601

GBFD-510501

GBFD-118106

HUAWEI I Handover

HUAWEI II Handover


Meaning: If the difference between uplink receive levels of calls within the same timeslot is greater than "Offset of the difference between uplink received levels" for P seconds among N seconds, the call with weak uplink receive level within the timeslot will be handed over to another timeslot. This parameter corresponds to N in the P/N criterion.



Default Value: 5

Unit: s

GSM BSS

GSM Dynamic Power Sharing 8 Counters



8-1

8 Counters

There are no specific counters associated with this feature.

GSM BSS

GSM Dynamic Power Sharing 9 Glossary



9-1

9 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

GSM BSS

GSM Dynamic Power Sharing 10 Reference Documents



10-1

10 Reference Documents

There is no specific reference document associated with this feature.

1 About This Document1.1 Scope1.2 Intended Audience1.3 Change HistoryDocument Issues02 (2012-06-30)01 (2011-03-31)Draft A (2011-01-15)

2 OverviewFigure 2-1 Power sharing principle

3 Technical Description3.1 Process of Dynamic Power SharingFigure 3-1 Process of Dynamic Power SharingCall Access PhaseCall Stable Phase

3.2 Initial Channel Allocation1. Based on the value of CHPWRINSUFFALLOWED, the BSC determines whether to allocate an idle channel in a timeslot with insufficient remaining power to a newly initiated call.2. The BSC determines the priorities of idle channels based on the power required by the call and the remaining power on the timeslots occupied by the idle channels. Then, it allocates an idle channel with the highest priority to a newly initiated call.

3.3 Handover Triggered by Insufficient Downlink PowerHandover Triggering ConditionsCall-Specific Conditions for a HandoverTarget Cell Selection

3.4 Handover Preventing a High-Level Uplink Signal from Overwhelming a Low-Level Uplink Signal3.5 Peak Clipping on Activated Channels

4 Related Features5 Impact on the Network5.1 Impact on System Capacity5.2 Impact on Network Performance

6 Engineering Guidelines6.1 When to Use Dynamic Power SharingTable 6-1 Dynamic power sharing requirements for sites and cellsMethod of Calculating FR Load1. Obtain the frequency planning principle and calculate the total number of available frequencies.2. Calculate the number of TRXs in each cell based on network engineering parameters, and obtain the number of BCCH frequencies that needs to be subtracted from the total number of available frequencies.

Method of Calculating the Distance Between SitesMethod of Calculating the Traffic Volume on Each Channel of a Cell

6.2 Information to Be Collected6.3 Network Planning6.4 Deploying Dynamic Power Sharing6.5 Performance OptimizationMonitoringTable 6-2 Counters to be observed after enabling Dynamic Power Sharing

Parameter Optimization

6.6 Troubleshooting

7 ParametersTable 7-1 Parameter description

8 Counters9 Glossary10 Reference Documents

GSM Dynamic Power Sharing-Feature Parameter Description

Documents

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