engergy saving mode for bcch trx.pdf

GSM/EDGE BSS,

rel. RG10(BSS), operating documentation, issue 02

Feature description

BSS20958: Energy saving mode for BCCH TRX

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The information in this document is subject to change without notice and describes only the product defined in the introduction of this documentation. This documentation is intended for the use of Nokia Siemens Networks customers only for the purposes of the agreement under which the document is submitted, and no part of it may be used, reproduced, modified or transmitted in any form or means without the prior written permission of Nokia Siemens Networks. The documentation has been prepared to be used by professional and properly trained personnel, and the customer assumes full responsibility when using it. Nokia Siemens Networks welcomes customer comments as part of the process of continuous development and improvement of the documentation.

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f Important Notice on Product Safety Elevated voltages are inevitably present at specific points in this electrical equipment. Some of the parts may also have elevated operating temperatures.

Non-observance of these conditions and the safety instructions can result in personal injury or in property damage.

Therefore, only trained and qualified personnel may install and maintain the system.

The system complies with the standard EN 60950 / IEC 60950. All equipment connected has to comply with the applicable safety standards.

The same text in German:

Wichtiger Hinweis zur Produktsicherheit

In elektrischen Anlagen stehen zwangsläufig bestimmte Teile der Geräte unter Span-nung. Einige Teile können auch eine hohe Betriebstemperatur aufweisen.

Eine Nichtbeachtung dieser Situation und der Warnungshinweise kann zu Körperverlet-zungen und Sachschäden führen.

Deshalb wird vorausgesetzt, dass nur geschultes und qualifiziertes Personal die Anlagen installiert und wartet.

Das System entspricht den Anforderungen der EN 60950 / IEC 60950. Angeschlossene Geräte müssen die zutreffenden Sicherheitsbestimmungen erfüllen.

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Table of contentsThis document has 19 pages.

Reason for update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.1 In general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.2 Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1 Software requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.2 Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.1 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.2 Functional split . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113.2.1 BSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113.2.2 BTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123.2.3 NetAct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4 System impacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1 Handovers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.2 Cell (re-)selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.3 GPRS/EDGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.4 Base band hopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144.5 Common BCCH control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144.6 Extended range cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144.7 BS power control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.2 MML commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.3 Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.4 Measurements and counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.4.1 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.4.2 Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.4.2.1 Dummy burst transmit power reduction statistics . . . . . . . . . . . . . . . . . . . . 165.4.2.2 Active channel power reduction statistics . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 – Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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List of figuresFigure 1 Power reduction for SDCCH/8, TCH and GPRS/EDGE . . . . . . . . . . . . . 10Figure 2 Power reduction on SDCCH/4 and TCH. . . . . . . . . . . . . . . . . . . . . . . . . 11

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List of tablesTable 1 Software requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Table 2 Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Table 3 Power reduction principles for SDCCH and TCH channels . . . . . . . . . 10Table 4 Power reduction principles for packet-switched resources . . . . . . . . . . 10Table 5 Power control object parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Table 6 Transmit power reduction counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Table 7 Active channel power reduction counters . . . . . . . . . . . . . . . . . . . . . . . 17

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Reason for update

Reason for update

Issue history

Details

Issue number

Date of issue Reason for update

01 12/2008 Approved draft of first issue for new release

1-1 03/2009 First issue for new release

1-2 06/2009 Second issue for new release

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BSS20958: Energy saving mode for BCCH TRX Introduction

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1 Introduction

1.1 In generalThe “Energy saving mode for BCCH TRX” (BSS20958) feature introduces a configu-rable power saving mode for the BCCH TRX. It aims to achieve lower electricity con-sumption by reducing the transmit power of the BCCH TRX.

This feature reduces the transmit power level of dummy bursts on idle circuit-switched channels of the BCCH carrier by 2 dB. The feature also enables 2 dB dynamic power control on active dedicated circuit-switched channels of the BCCH TRX.

This feature reuses, for the circuit-switched channels of a BCCH TRX, the same excep-tions that the 3GPP specifications allow for the maximum output power of 8-PSK mod-ulated channels.

1.2 BenefitsThe reduced electricity consumption due to the “Energy saving mode for BCCH TRX” helps operators to reduce network operating costs.

When this feature is activated in the network, most of the energy savings are provided by the dummy burst power reduction during periods of low traffic, e.g. at night time. With dynamic power control of active dedicated channels, the feature reduces electricity con-sumption throughout the day.

The reduced transmit power of dummy bursts, and the limited dynamic power control allowed for active CS channels, result in a reduction in downlink interference caused by the BCCH frequency.

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Requirements

2 RequirementsThe following software and hardware are required for the “Energy saving mode for BCCH TRX”.

2.1 Software requirements

2.2 Hardware requirements

Network element Software release required

BSC S14

Flexi EDGE BTS EP3

UltraSite EDGE BTS CX7

NetAct OSS 5.1 CD set 2

Table 1 Software requirements

Network element Hardware/firmware required

BTS Flexi EDGE or UltraSite EDGE HW

Table 2 Hardware requirements

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BSS20958: Energy saving mode for BCCH TRX Functional description

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3 Functional descriptionIn the “Energy saving mode for BCCH TRX” feature, the BTS transmits at a 2 dB lower power level for the dummy bursts on idle timeslots of the BCCH TRX.

The BSC supports 2 dB dynamic power control on TCHs and SDCCHs of the BCCH TRX, to be used in cells where this feature is applied.

This feature is controlled using a license key at the BSC level. When the license state is ON, the operator can choose which cells of the BSC will make use of this feature.

This chapter is divided into the following sections: • “Functional overview” • “Functional split”

3.1 Functional overviewAccording to GSM standards, the BTS must continously send RF signal in all timeslots of the BCCH frequency, in order to enable the mobile stations to detect the signals related to paging access and handover. The sending process on the BCCH frequency uses the maximum allowed power level of a cell. If there is no active traffic in a timeslot on the BCCH frequency, then dummy bursts are used to generate RF signals in the air interface. The sending of dummy bursts on the BCCH frequency constantly consumes energy, irrespective of whether traffic is present or not on a BCCH TRX. Sending dummy bursts with full transmit power on a BCCH frequency is also a major source of downlink interference in the GSM network.

The “Energy Saving Mode for BCCH TRX” lowers electricity consumption by reducing the transmit power used on a BCCH TRX. The power reduction concerns idle SDCCH and TCH channels on TSLs 0 - 6, and active SDCCH and TCH connections on TSLs 0 - 6. The TSL 7, as the time slot preceeding the one used for BCCH/CCCH, is not affected by this power reduction, and full BCCH power is used for this timeslot.

The dummy bursts for idle SDCCH and TCH channels of a BCCH TRX, excluding on TSL7, are sent with a 2 dB power reduction.

For active TCH connections on timeslots other than TSL7 of the BCCH TRX, the transmit power can be dynamically reduced by 2 dB, if this is allowed by the normal power control parameters that the operator has defined for the downlink direction.

The dynamic 2 dB power control for the active SDCCH connections has only a minor effect on energy saving on the BCCH TRX. Typically, the SDCCH connections are so short that power control does not take place.

The idle bursts in the GPRS/EDGE territory experience the same power reduction as the dummy bursts in the circuit-switched territory. The packet-switched data traffic in GPRS/EDGE is not affected by this feature. As a seperate feature, the BTS uses a constant 2 dB power reduction for the maximum output power level (power level 0) of 8-PSK modulated TSLs in GPRS/EDGE.

The BCCH/CCCH channels and CBCH channels in a BCCH TRX are not affected by this feature.

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Functional description

“Table 3” summarizes the principles of power reduction on the SDCCH and TCH channels of a BCCH TRX.

“Table 4” summarizes the principles of power reduction in the packet switched territory of a BCCH TRX, including the existing 2 dB mean power reduction for the maximum output power level (power level 0) of EGPRS.

“Figure 1” and “Figure 2” show how the transmit power is reduced in typical BCCH TRX configuations, including the existing 2 dB mean power reduction for 8-PSK traffic of GPRS/EDGE.

Figure 1 Power reduction for SDCCH/8, TCH and GPRS/EDGE

SDCCH/4 combined with BCCH

SDCCH/8 (TSL1........TSL6)

TCH (TSL1........TSL6)

TCH, SDCCH/8 (TSL 7)

IDLE 2 dB reduction 2 dB reduction 2 dB reduction Full power

ACTIVE Dynamic 2 dB reduction

Dynamic 2 dB reduction

Dynamic 2 dB reduction

Full power

Table 3 Power reduction principles for SDCCH and TCH channels

(TSL1...TSL6) (TSL7)

IDLE BURSTS 2 dB reduction Full power

GPRS DATA Full power Full power

EGPRS DATA 2 dB reduction for power level 0 2 dB reduction for power level 0

Table 4 Power reduction principles for packet-switched resources

BC

CH

SD

CC

H/8

Idle

TCH

Idle

TCH

ED

GE

GP

RS

BC

CH

SD

CC

H/8

Idle

Idle

TCH

TCH

ED

GE

GP

RS

Timeslot 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

Active CS channels may use2 dB lower Tx power

Idle CS channels use2 dB lower Tx power

Tx Power

Pmax

Pmax - 2dB

EDGE burst uses 2 dB lower mean Tx

power

BCCH and GPRS use full Tx power

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BSS20958: Energy saving mode for BCCH TRX Functional description

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Figure 2 Power reduction on SDCCH/4 and TCH

3GPP TS 45.008 states that 8-PSK modulated timeslots may use at most 2 dB lower mean power on TSL7. This is to avoid power changes immediately before the time slot used for BCCH/CCCH. A power change at this point could be harmful for the majority of terminal types. In order to guarantee that the 2 dB limit is not exceeded, TSL 7 is not affected by the power reduction related to this energy saving feature.

3.2 Functional splitThis section describes the impact of the “Energy saving mode for BCCH TRX” on the network elements, interfaces and other functions.

3.2.1 BSCThe control mechanism of the feature, the license key, and the power control parameter are implemented in the BSC.

The BSC informs the BTS about the dummy burst transmit power reduction being used in a segment, after which the BTS performs the actual power reduction for the dummy bursts in the idle channels of the segment’s BCCH TRX.

In the “Energy saving mode for BCCH TRX” the BSC commands the BTS to perform transmit power control on dedicated connections, also in a non-hopping BCCH TRX. In its command to the BTS, the BSC limits the power control to 2 dB, that is to one power control step. In a base band hopping BCCH TRX, the BSC commands full dynamic power control, and the BTS takes care of limiting the actual power reduction to 2 dB on the BCCH frequency.

The BSC collects the statistics of this feature.

BC

CH

/SD

CC

H4

TCH

Idle

TCH

Idle

TCH

TCH

Idle

BC

CH

/SD

CC

H4

TCH

Idle

Idle

TCH

TCH

TCH

Idle

Timeslot 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

Active CS channels may use2 dB lower Tx power

Idle CS channels use2 dB lower Tx power

Tx Power

Pmax

Pmax - 2dB

BCCH uses full Tx power

TSL7 uses constalntly full Tx power

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Functional description

3.2.2 BTSThe BTS has the main responsibility for dummy burst transmit power reduction. Once the BSC indicates to the BTS that dummy burst transmit power is to be reduced in a segment, then the BTS performs the transmit power reduction for the dummy bursts in the idle channels of the segment’s BCCH TRX, according to the value indicated by the BSC.

When the BSC has indicated to the BTS the use of dummy burst transmit power reduc-tion, the BTS also accepts the limited 2 dB dynamic power control for the TCH and SDCCH connections on the BCCH frequency. In a non-hopping BCCH TRX, the BTS performs power control according to the power control commands from the BSC. In a base band hopping BCCH TRX, the BTS makes sure that, on the BCCH frequency, the actual power reduction does not exceed 2 dB, even though the BSC may have com-manded a reduction beyond that.

The BTS uses full BCCH transmit power for both dummy bursts and active CS connec-tions on TSL 7, irrespective of BSC instructions.

3.2.3 NetActNetAct supports the segment-specific power control object parameter that is used to control use of the feature at cell level.

NetAct also supports the performance measurement counters of the feature, and offers them for post-processing purposes to the operator.

NetAct supports the handling of license keys to be provided on the BSC.

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BSS20958: Energy saving mode for BCCH TRX System impacts

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4 System impactsThe “Energy saving mode for BCCH TRX” has interactions with the following functions. • “Handovers” • “Cell (re-)selection” • “GPRS/EDGE” • “Base band hopping” • “Common BCCH control” • “Extended range cell” • “BS power control”

4.1 HandoversThis feature affects the performance of the neighbouring cell BCCH measurements and the related handover decisions in the neighbouring cells. The transmit power reduction of the BCCH TRX affects most inter-cell handover types. The operator must take this into account and consider adjusting the related parameters to include the BCCH TRX energy-saving feature in the network.

The effect of BCCH TRX power reduction on neighbour cell measurements is at its highest during low traffic. The severity of the inaccuracy is compensated by the overall quality improvement that the situation of low traffic offers. At this time, the need for adjustment in the relevant adjacent cell parmeters may not be necessary at all. The most critical phase is at the time of high traffic, and the need to avoid changes in network behavior at this time is more important. Therefore, the adjustment to be made must be very moderate, or should be even left undone, and the possible changes should be decided based on the change in network behavior experienced after the “Energy saving mode for BCCH TRX” is enabled.

4.2 Cell (re-)selectionDue to the effect on neighbour cell BCCH measurements, this feature also affects cell access and cell reselection as it does for inter-cell handovers. Operators must consider the effect and adjust the related parameters when introducing the “Energy saving mode for BCCH TRX” to the network.

4.3 GPRS/EDGEThe packet-switched data traffic in a GPRS/EDGE territory of a BCCH TRX is not affected by this feature. However, the dummy bursts that are sent in the TSLs of a GPRS/EDGE territory in a BCCH TRX experience the same power reduction as the dummy bursts sent in the circuit-switched territory of the BCCH TRX. As an existing feature, the BTS uses a constant 2 dB power reduction for the maximum output power level (power level 0) of 8-PSK modulated TSLs in GPRS/EDGE.

Because of its effects on the neighbour cell BCCH measurements, the reduction in BCCH TRX transmit power also affects the packet-switched services of GPRS/EDGE. The operator must consider adjusting the GPRS/EDGE-specific cell access and cell re-selection parameters in a similar way as done for the respective parameters of the circuit-switched services, when using the “Energy saving mode for BCCH TRX” in the network.

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System impacts

In the GPRS/EDGE implementation of the PCU, the mobile stations base their uplink power control on the serving cell’s BCCH measurements. As a result of using the BCCH TRX power reduction, the operator must consider tuning also the related power control parameters.

4.4 Base band hoppingThe BSC does full dynamic power control in a BB hopping BCCH TRX. With this feature, the BTS allows the 2 dB power reduction on the BCCH frequency.

4.5 Common BCCH controlThis feature affects the segment internal handovers starting from the non-BCCH layer of the segment, when the BCCH layer usability is evaluated based on the BCCH mea-surement of the segment itself.

4.6 Extended range cellIn an extended range cell, the operators are advised not to use this feature. This is because the BCCH signal levels are low for the distant users, even without the energy saving feature in use.

4.7 BS power controlThis feature enables limited power control for active SDCCH and TCH connections on a BCCH TRX. The reduced power consumption to be achieved does not overrule the existing power control rules and criteria. These are still followed and, if full power is required, the use of the “Energy saving mode for BCCH TRX” does not change that. The power reduction in a BCCH TRX is possible only if the reduction is regarded as allowed by the existing criteria.

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BSS20958: Energy saving mode for BCCH TRX User interface

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5 User interfaceThe user interface impacts due to the “Energy saving mode for BCCH TRX” feature are described in this section.

This chapter is divided into the following sections: • “Parameters” • “MML commands” • “Alarms” • “Measurements and counters”

5.1 ParametersThe power control parameter related to this feature is described in “Table 5”.

5.2 MML commandsAs a result of this feature, the EUG command for modifying general parameters can now also be used to modify the “BCCH TRX transmit power reduction” parameter.

5.3 AlarmsThere are no new alarms or changes to existing alarms resulting from this feature.

5.4 Measurements and counters

5.4.1 MeasurementsThe “113 Power saving” measurement collects the statistics related to this feature. The BSC telecom functionality measures the cumulative idle time of power-reduced dedi-cated channels in the circuit-switched territory of the BCCH TRX, and the sharing between full BCCH power use and reduced output power use in the connections of a BCCH TRX.

5.4.2 CountersThe counters related to this feature are classified into two categories: • “Dummy burst transmit power reduction statistics” • “Active channel power reduction statistics”

Name Level Description Range Default value

BCCH TRX transmit power reduction

Power control object

Defines the amount of BCCH TRX transmit power reduction.

0 - 2 dB 0 dB

Table 5 Power control object parameter

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User interface

5.4.2.1 Dummy burst transmit power reduction statisticsThe counters listed in “Table 6” collect the data for dummy burst transmit power reduc-tion statistics in the “113 Power saving” measurement. The counters collect the amount of time that channels of two different types are idle in a BCCH TRX. The information is collected from single channels (sub-channels of a time slot) but the time in each counter corresponds to a value of a total radio time slot being idle. By combining this information with knowledge about the savings per time slot, the operator can refine the data into actual savings resulting from the dummy power burst power reduction in a cell.

The channels on TSL 7 are excluded from the statistics because the dummy burst transmit power reduction is not applied to these.

Note that the counters for the dummy burst transmit power reduction only record the time that the dedicated channels are idle when the licence for Energy Saving Mode for BCCH TRX has been activated and the 113 Power Saving Measurement is running. Idle time statistics are collected in all the BTS objects of the BSC. Idle time statistics are also collected in BTS objects that do not support the feature and in segments where the feature has not been activated. If your use of the feature is not extensive, you should filter out those BTSs/segments where the feature is not in use when the measurement data is used for calculating BSC level savings.

The dummy burst transmit power reduction statistics cover the dedicated channels of circuit-switched territory. The possible dummy bursts that are sent in the TSLs of a GPRS/EDGE territory in a BCCH TRX, experience the same power reduction as the dummy bursts sent in the CS territory, but the counters of this measurement collect data only from the power saving of the CS territory.

5.4.2.2 Active channel power reduction statisticsThe counters listed in “Table 7” collect data related to the dynamic 2 dB reduction in transmit power of active CS connections on the BCCH frequency, in the “113 Power saving” measurement. One counter collects the samples related to the use of full BCCH power and another counter collects the samples related to the use of reduced transmit power. There is a pair of these counters for each of the SDCCH, full rate TCH and half rate TCH channels.

In the power reduction of active CS connections on the BCCH TRX, the connections on TSL 7 are excluded from the statistics, because dynamic power control is not employed on TSL 7 of a BCCH TRX.

Counter name Description Trigger

BCCH TRX IDLE TIME ON SDCCH

Sum of the time that SDCCH channels are idle in a BCCH TRX. TSL 7 is not included.

Updated every time an idle period of a SDCCH ends and at the measurement period end.

BCCH TRX IDLE TIME ON TCH

Sum of the time that TCH channels are idle in a BCCH TRX, excluding those on TSL 7.

Updated every time an idle period of a TCH ends and at the measurement period end.

Table 6 Transmit power reduction counters

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BSS20958: Energy saving mode for BCCH TRX User interface

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Using the collected data, operators can find out the amount of reduction in the output power of the dedicated connections in the BCCH TRX, and estimate the corresponding savings gained.


FULL BCCH POWER ON SDCCH

Number of measurement results indicating full BCCH transmit power on SDCCH.

Incremented when handover and power control algorithm receives measurement result from the BTS indicating full BCCH transmit power on SDCCH.

REDUCED BCCH POWER ON SDCCH

Number of measurement results indicating reduced BCCH transmit power on SDCCH.

Incremented when handover and power control algorithm receives measurement result from the BTS indicating reduced BCCH transmit power on SDCCH.

FULL BCCH POWER ON TCH/F

Number of measurement results indicating full BCCH transmit power on TCH/F.

Incremented when handover and power control algorithm receives measurement result from the BTS indicating full BCCH transmit power on TCH/FR.

REDUCED BCCH POWER ON TCH/F

Number of measurement results indicating reduced BCCH transmit power on TCH/F.

Incremented when handover and power control algorithm receives measurement result from the BTS indicating reduced BCCH transmit power on TCH/FR.

FULL BCCH POWER ON TCH/H

Number of measurement results indicating full BCCH transmit power on TCH/H.

Incremented when handover and power control algorithm receives measurement result from the BTS indicating full BCCH transmit power on TCH/HR.

Table 7 Active channel power reduction counters

18 DN70645902, issue 1-2


Id:0900d8058058d775

User interface

REDUCED BCCH POWER ON TCH/H

Number of measurement results indicating reduced BCCH transmit power on TCH/H.

Incremented when handover and power control algorithm receives measurement result from the BTS indicating reduced BCCH transmit power on TCH/HR.


Table 7 Active channel power reduction counters (Cont.)

DN70645902, issue 1-2

19

BSS20958: Energy saving mode for BCCH TRX Abbreviations

Id:0900d80580222214

6 Abbreviations

0 – Z3GPP 3rd generation partnership project

BB base band

BCCH broadcast control channel

BSC base station controller

BTS base transciever station

CBCH cell broadcast channels

CCCH common control channel

CS carrier selection

DFCA dynamic frequency and channel allocation

EDGE enhanced data rates for GSM evolution

EGPRS enhanced GPRS

GMSK gaussian minimum shift keying

GPRS general packet radio service

GSM global system for mobile communication

HCS hierarchical cell structure

HW hardware

IE information element

KPI key performance indicator

MML man-machine language

NCCR network controlled cell reselection

PBGT power budget

PCU packet control unit

PSK pre-shared key

phase shift keying

RF radio frequency

SDCCH stand-alone dedicated control channel

TCH traffic channel

TRX transceiver

TSL time slot

engergy saving mode for bcch trx.pdf

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