117360864 ZGF05!23!006 Intellignet TRX Shutdown

ZGF05-13-006 Intelligent TRX Shutdown

Feature Description


ZTE Confidential Proprietary 2008 ZTE Corporation. All rights reserved. I


Version Date Author Approved By Remarks

V8.1.1 2009-03-12 Not open to the Third Party

V8.1.2 2009-8-10 Not open to the Third Party

2009 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information of the document is subjected to change without notice.


II 2008 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

TABLE OF CONTENTS

1 Feature Attribute ........................................................................................................ 1

2 Overview ..................................................................................................................... 1 2.1 Feature Introduction ..................................................................................................... 1 2.2 Correlation with Other Features................................................................................... 1

3 Technical Description ................................................................................................ 2

4 Parameters and Configuration .................................................................................. 3 4.1 Parameter List ............................................................................................................. 3 4.2 Parameter Configurations ............................................................................................ 4

5 Related Counters and Alarms ................................................................................... 7 5.1 Related Counters ......................................................................................................... 7 5.2 Related Alarms ............................................................................................................ 8

6 Engineering Guide ..................................................................................................... 8 6.1 Application Scenario .................................................................................................... 8 6.2 Configuration Description ............................................................................................ 8 6.3 Network Impact ............................................................................................................ 8

7 Abbreviation ............................................................................................................... 8

8 Reference Document ................................................................................................. 8

FIGURES

Figure 1 Configuration interface 1 of Intelligent TRX Power-down .............................................. 5




ZTE Confidential Proprietary 2008 ZTE Corporation. All rights reserved. 1

1 Feature Attribute

iBSC version: [iBSC V6.10]

BTS version: [applicable to 8000 BTSs]

Attribute: [Optional function]

NEs involved and requirement

NE Name Related or Not Special Requirements:

MS

BTS

BSC

MSC -

MGW -

SGSN -

GGSN -

HLR -

Dependent Function: [None]

Exclusive Function: [None]

Remarks: [None]

2 Overview

2.1 Feature Introduction

The intelligent TRX shutdown indicates that when the traffic of a cell is lowered to a certain degree, partial carriers should be shutdown to save the power and cost.

If a cell is configured with multiple carrier boards, when the non-BCCH carrier has no traffic in the low traffic period, the intelligent TRX shutdown technology can be used to save partial power consumption of baseband as well as the PA static power consumption, thus saving the energy. When the traffic in the cell raises, the power supply of non-BCCH carrier will be triggered automatically.

2.2 Correlation with Other Features

Because there may be calls in conversation when the carrier is specified to power down, the intra-cell handover should be performed under the condition that the QoS is not affected, and the call could be handed over to another carrier.


2 2008 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

ZGF05-11-003 TCH Migration to BCCH TRX

3 Technical Description

The basic principle of the intelligent TRX shutdown is: when the BTS traffic decreases, the BTS can shut down some TRX without load through the software automatic control to save the power consumption. The transceiver module is the important module of BTS, also the important role of power consumption in the BTS. By shutting down the transceiver module without users temporarily, the intelligent TRX shutdown can reduce the unnecessary power consumption greatly, and enhance the resource utilization effectively.

Under the condition that the network QoS is ensured, the ZTE intelligent TRX shutdown can reduce the power consumption effectively in non-peakhour period, especially for the period when the access users are relatively less at night.

Specific implementation scheme:

1 Parameter switch control: set the parameters in the network management to determine whether to Switch on the iBSC intelligent TRX shutdown function.

2 Period control: set the period when the intelligent TRX shutdown can be activated to allow the cell to enable the function in a certain period, so as to disable the function in the peak hours of traffic.

3 Traffic threshold: you can set two thresholds for traffic: high and low thresholds. In the period when the function is enabled, the cell traffic is calculated in a certain period (usually you can set 5 minutes), and the function is activated when the traffic volume is lower than the threshold; the function is stopped when the traffic volume is higher than the threshold; the protective section between the high threshold and low threshold is required to avoid the frequent startups and interruptions of the function.

4 TRX shutdown priority: before executing the intelligent TRX shutdown, BSC will select the TRX with lowest priority to power down. New call requests will not be allocated to this TRX. If TRXs with high priority have enough idle timeslots, the traffic can be handed over to these TRXs by the intra-cell handover method.

5 Traffic timeslot combination: when the carrier that is to be powered down still has traffic, the traffic will be informed to hand over to another carrier with high-priority.

6 Carrier emergency power-up: the carrier emergency power-up will be performed in the following conditions: the traffic channel in a cell is not enough for service; the BSC intelligent power-down function is forbidden; the cell carrier intelligent power-down function is forbidden in current period.

7 Carrier shutdown condition reporting: support the carrier shutdown condition reporting, including reporting time, total times of carrier shutdown (every 15 minutes), and total duration of carrier shutdown (every 15 minutes).

When the selected TRX has no traffic, the power-down operation should be performed. The electric switch is used to shut down the carrier power. At this time, the power consumption of the whole TRX is reduced to 0.



Carrier Power-down and Voice Channel Retention

The power-down status of the carrier should be sent by BSC to BTS, and BTS enables or disables the carrier as required. Because there may be calls in conversation when the carrier is specified to power down, the intra-cell handover could be performed under the condition that the QoS is not affected, and the call could be handed over to another carrier, or the traffic can be retained, and the carrier power-down operation could be performed until the call is finished.

Consistency and reliability guarantee

The consistency of power-down and power-up statuses between the BTS and BSC is guaranteed by the BTS periodical report of power-up and power-down statuses. The BSC compares the statuses with each other when it receives the status report from BTS, thus controlling the consistency of power-down and power-up statuses between the BSC and BTS.

4 Parameters and Configuration

4.1 Parameter List Full name Switch Flag of Ceil TRX Power Off

Abbreviation StartTRXPowerOff

Description It marks whether "Switch Flag of Ceil TRX Power Off" is enabled.

Value Range Yes/No

Unit None

Default No

Management object BSC

Full name IBS shutdown limit

Abbreviation --

Description

It describes IBS shutdown limit, when the cell cando IBS shutdown inspection, if traffic in current cell is lower than this threshold, this cell need close a carrier.

Value Range 0 ~ 70

Unit %

Default 30


Full name IBS powerup limit

Abbreviation --

Description

It describes IBS powerup threshold. If traffic in current cell exceeds this threshold, it is considered this cell shall enable the carrier closed during IBS shutdown.

Value Range 0 ~ 90

Unit %

Default 60


Full name IBS powerover limit

Abbreviation --

Description It indicates the resource utilization threshold for



urgent powerup in IBS shutdown function, after occupying channel proportion over this threshold, immediately enable the carriers that is closed during IBS shutdown.

Value Range 70 ~ 95

Unit %

Default 90


Full name IBS power priority

Abbreviation --

Description It describes IBS power priority.

Value Range Carrier priority > interference band , interference band > carrier priority, only as per interference band, only as per carrier priority

Unit None

Default Carrier priority > interference band


Full name IBS time bitmap

Abbreviation --

Description

It indicates bitmap at the segment of IBS shutdown function enabled, in hour. Based on time segment configuration, BSC decides whether current time belongs to the segment of IBS shutdown function, then check whether the cell allows to disable IBS shutdown carrier.

Value Range 0 ~ 23, Checked

Unit Hour

Default Unchecked


Full name BCCH forbbiden TS merger time bitmap

Abbreviation --

Description It indicates BCCH forbbiden TS merger time bitmap, in hour. Intelligent TRX shutdown decides whether traffic of other carrier can migrate to BCCH carrier.

Value Range 0 ~ 23, Checked

Unit Hour

Default Unchecked


4.2 Parameter Configurations

1 In the configuration resource tree window, select OMC -> GERAN Subnetwork ->

BSC Managed Element -> Config Set -> BSC Function -> Site Config -> BTS ID, and then double-click Cell ID. In the Basic Params 2 tab in right Cell window, set Activate Cell TRX Shutdown to Yes, as shown in Figure 1.



Figure 1 Configuration interface 1 of Intelligent TRX Power-down

2 In the configuration resource tree window, right click and select OMC -> GERAN

Subnetwork -> BSC Managed Element -> Config Set -> BSC Function -> Set Module Parameters, as shown in Figure 2.




3 Click Set Module Parameters, and set the following parameters in Intelligent Power-down Parameters tab in pop-up Set Module Parameters window:

Power-off threshold (%)

Power-on threshold (%)

Emergency power-on resource usage threshold (%)

Select the method and sequence for intelligent power-down (%)

Functional time bitmap

For the related configuration interface, see Figure 3.




5 Related Counters and Alarms

5.1 Related Counters Counter ID What It Counts

C900560015 TCH/H busy time

C900560023 TCH/F busy time(SpeechVer1)

C900560009 Average number of available radio channel

C900560019 Number of available defined TCH/H

C900560028 Number of available defined TCH/F

C900580061 Number of TRX poweroff

C900580062 Duration of TRX poweroff



5.2 Related Alarms

None

6 Engineering Guide

6.1 Application Scenario

This feature is applicable to the circumstance: the cell station type is S444 or above, and the difference of traffic volume between idle and busy hours is big enough to clear up couple of carriers without traffic in idle hours.

6.2 Configuration Description

This function is not related with the adjustment of iBSC and BTS hardware configurations.

6.3 Network Impact

This feature does not affect the network.

7 Abbreviation Abbreviations Full Characteristics

BCCH Broadcast Control Channel

BSC Base Station Controller

TCH Traffic channel

8 Reference Document

[1] ZXG10 BSS (V6.20.10) Radio Parameters Reference V1.0

[2] ZGF05-11-003 TCH Migration to BCCH TRX

Documents

117360864 ZGF05!23!006 Intellignet TRX Shutdown