ZTE UMTS NodeB Multi-Carrier Dynamic Power Sharing Feature Guide

Multi-Carrier Dynamic Power

Sharing

Feature Guide

Multi-Carrier Dynamic Power Sharing

ZTE Confidential Proprietary 1


Version Date Author Reviewer Notes

V1.00 2014/06/19 Song Nan Song Tingshan First edition

© 2014 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 in this document is subjected to

change without notice.



TABLE OF CONTENTS

1 Feature Attribute ............................................................................................... 4

2 Overview ............................................................................................................ 4

2.1 Feature Introduction ............................................................................................. 4

2.1.1 ZWF21-40-008 Multi-Carrier Dynamic Power Sharing ......................................... 4

2.2 License Control .................................................................................................... 5

2.3 Correlation With Other Features .......................................................................... 5

3 Technical Description ....................................................................................... 6

3.1 ZWF21-40-008 Multi-Carrier Dynamic Power Sharing ......................................... 6

4 Parameters ......................................................................................................... 8

4.1 ZWF21-40-008 Multi-Carrier Dynamic Power Sharing ......................................... 8

5 Related Counters and Alarms .......................................................................... 9

5.1 Related Counters ................................................................................................. 9


5.2 Related Alarms .................................................................................................... 9


6 Engineering Guide .......................................................................................... 10

6.1 Application Scenario .......................................................................................... 10

6.2 Feature Activation Procedure ............................................................................. 10

6.2.1 ZWF21-40-008 Multi-Carrier Dynamic Power Sharing ....................................... 10

6.3 Feature Validation Procedure............................................................................. 12


6.4 Feature Deactivation Procedure ......................................................................... 13


6.5 Impact on the Network ....................................................................................... 14

7 Abbreviation .................................................................................................... 14

8 Reference Document ....................................................................................... 14



FIGURES

Figure 3-1 Algorithm Process of Dynamic Power Sharing ................................................... 7

Figure 6-1 Parameter Configuration 1 ................................................................................11

Figure 6-2 Parameter Configuration 2 ................................................................................12

TABLES

Table 4-1 Multi-Carrier Dynamic Power Sharing Parameter List ......................................... 8

Table 5-1 Multi-Carrier Dynamic Power Sharing Counter List ............................................. 9

Table 6-1 Multi-Carrier Dynamic Power Sharing Validation Procedure ..............................12

Table 6-2 NodeB Parameter List 1 .....................................................................................13



1 Feature Attribute

RNC version: [RNC V3.13.10.15/RNCV4.13.10.15]

NodeB version: [V4.13.10.20]

Attribute: [Optional]

Involved NEs:

NE Name Related or Not Special Requirement

MS/UE -

BTS/Node B -

BSC/RNC √

iTC -

MSC -

MGW -

SGSN -

GGSN -

HLR -

“√”: involved, “-”: not involved

2 Overview

2.1 Feature Introduction

2.1.1 ZWF21-40-008 Multi-Carrier Dynamic Power Sharing

The principle of Multi-Carrier Dynamic Power Sharing is that, in a WCDMA system with

the multi-carrier feature, the carrier power of a cell with less UE accesses may be

redundant, the redundancy is shared with the cells with more UEs for HSDPA scheduling,

and the system throughput is improved because of power sharing. The ratio of power

sharing can be modified in the OMC.



2.2 License Control

This feature is controlled by a license. Before commissioning this feature, you must get

authorization through the OMC or LMT.

Table 2-1 License Control List

Feature ID Feature Name License Control

Item

Configured

NE

Unit

ZWF21-40-008 Multi-Carrier

Dynamic Power

Sharing

Multi-Carrier

Dynamic Power

Sharing

NodeB Cell

2.3 Correlation With Other Features

1. Required Features

ZWF26-02-004 DC HSDPA

ZWF26-03-002 DB DC-HSDPA

ZWF26-04-001 4C HSDPA

2. Mutually Exclusive Features

None

3. Affected Features

None



3 Technical Description

3.1 ZWF21-40-008 Multi-Carrier Dynamic Power

Sharing

To make full use of the RRU power, multi-carrier dynamic power sharing is introduced.

This feature makes RRU’s power more effective, even in DC or more carriers for the

same purpose.

This feature can be enabled when at least one of the following three features is enabled:

DC-HSDPA

DB DC-HSDPA

4C HSPDA

For the judgment method and activity policy, refer to the following documents:

ZTE UMTS DC-HSDPA Feature Guide

ZTE UMTS Dual-Band DC-HSDPA Feature Guide

ZTE UMTS 4C-HSDPA Feature Guide

If dynamic power sharing is enabled, for the cells connected to the same RRU, the

residual power of each cell can be calculated by using the largest available power and

the recent power of each cell. With the residual power, you can determine whether to

increase or decrease the largest available power. The largest available power of a cell

should be decreased if the cell has the largest residual power of all the cells connected to

the same RRU, and the largest available power of a cell should be increased if the cell

has the smallest residual power of all the cells connected to the same RRU.

This algorithm only modifies the power of the carriers that have the maximum power

usage or the minimum power usage in a scheduling period, without restriction of carrier

quantity.



The algorithm process is described as follows:

1. For a multi-carrier cell where multiple carriers are connected to the same RRU, each

carrier reports its initial largest power, largest available power, and the filtered value

of recent power to a super scheduler.

2. The super scheduler calculates the residual power based on the largest available

power minus the filtered value of recent power.

3. The cell sorts the residual power from large to small.

4. Finds a cell where the largest available power is greater than the threshold, and

decreases the largest available power of the cell by one step. Increases the largest

available power of the cell that is the last one in the sorted cell list by one step.

Figure 3-1 Algorithm Process of Dynamic Power Sharing

Begin

Calculate the residual power in each

cell

Pmax(i)=Pmax(i)-delta

Pmax(n)=Pmax(n)+delta

return Pmax

（i）

Is the cell where the largest

available power Is greater than The Threshold?

Pmax(i)>Pfirstmax(i)*Ai=i+1,find the next cell

Sort the residual power from larger to smaller

Is the cell the last one? i=n

Yes

Yes

No

No



4 Parameters

4.1 ZWF21-40-008 Multi-Carrier Dynamic Power

Sharing

Table 4-1 Multi-Carrier Dynamic Power Sharing Parameter List

Parameter

Name GUI Name

Parameter

Description

Value

Range Unit

Default

Value

Recommend

ed Value

NodeBFun

cion.Powe

r-sharing

ration

Power-sharing

ration

Power-sharin

g ratio of

located cell in

a PA.

0–50 % 0 25

ULocalCell

.maxDlPwr

Maximum Tx.

power

Maximum

transmission

power of the

local cell. It

must be greater

than or equal to

the

transmission

power

configured for

the RNC. The

transmission

power sum of

all local cells

that the same

RU power

amplifier bears

must be less

than the rated

power

(Pa.powewr).

255 indicates

the maximum

power is not

[0–200],

[255–255] N/A 255 N/A



Parameter

Name GUI Name

Parameter

Description

Value

Range Unit

Default

Value

Recommend

ed Value

configured.

5 Related Counters and Alarms

5.1 Related Counters


Table 5-1 Multi-Carrier Dynamic Power Sharing Counter List

Counter ID Name

C372490257 Borrowed power times in a cell, where carrier power is shared

dynamically

C372490258 Borrowed power time period in a cell, where carrier power is

shared dynamically

C372490259 Lent power times in a cell, where carrier power is shared

dynamically

C372490260 Lent power time period in a cell, where carrier power is shared

dynamically

5.2 Related Alarms


This feature has no related alarm.



6 Engineering Guide

6.1 Application Scenario

This feature is introduced in the situation where multi-carrier configured in one RRU.

Compared with fixed power sharing, dynamic modification of multi-carrier power makes

an RRU work more efficiently, and the downlink system throughput is improved.

6.2 Feature Activation Procedure


In the configuration resource tree, select Modify Area > Managed Element > Radio

Parameter > UMTS > UMTS Sector > Local Cell-List and double-click Local Cell. Set

Maximum Tx power (W). See Figure 6-1



Figure 6-1 Parameter Configuration 1



In the configuration resource tree, select Modify Area > Managed Element > Radio

Parameter and double-click UMTS. Set Power-sharing ratio. See Figure 6-2.

Figure 6-2 Parameter Configuration 2

6.3 Feature Validation Procedure


Table 6-1 Multi-Carrier Dynamic Power Sharing Validation Procedure

Test Item Multi-Carrier Dynamic Power Sharing



Test Item Multi-Carrier Dynamic Power Sharing

Prerequisite

1. The WCDMA system is operating properly.

2. Cell1 supports HSUPA, HSDPA and DCH.

3. Cell2 supports HSUPA, HSDPA and DCH.

4. Cell1 and Cell2 belong to the same sector.

5. The categories of UE1, UE2, UE3 and UE4 are 14, with

interactive or background services, and MBR = UL5.76Mbps/

DL21Mbps.

6. UE1 and UE2 reside in Cell1 in Idle mode. UE3 and UE4

reside in Cell2 in Idle mode.

Step

1. Use UE1 and UE2 to originate PS calls in Cell1, and start FTP

download.

2. Observe Cell1 and Cell2 measurement information in the

EPMS.

3. Use UE3 and UE4 to originate PS calls in Cell2, and start FTP

download.

4. Observe Cell1 and Cell2 measurement information in the

EPMS.

5. Deactivate all PS services.

Expected Result

1. In step 2, cell1 borrows power from cell2. So the transmission

power in cell1 is more than the maximum configuration power

of cell1.

2. In step 4, cell1 returns power back to cell2. So the

transmission power in the two cells is less than the maximum

configuration power.

6.4 Feature Deactivation Procedure


Table 6-2 NodeB Parameter List 1

Managed Object. logic name GUI Name

Default

Value

Deactivation

Value



Managed Object. logic name GUI Name

Default

Value

Deactivation

Value

ULocalCell.maxDlPwr Maximum Tx

power(W) 255 255

NodeBFuncion.paShareRatio Power-sharing

ration 0 0

For the description and configuration of these parameters, refer to chapter 6.2.1.

6.5 Impact on the Network

Impact on equipment performance

Dynamic modification of multi-carrier power makes an RRU work more efficiently,

improves the downlink system throughput, and consequently increases the CPU usage

of the DSP in an RNC.

Impact on network KPIs

Compared to fixed power sharing, NodeB multi-carrier dynamic power sharing

dynamically shares carriers’ power, and improves the downlink system throughput.

7 Abbreviation Abbreviation Full Name

3GPP 3rd

Generation Partnership Project

PA Power Amplifier

RRU Radio Remote Unit

8 Reference Document

ZTE UMTS DC-HSDPA feature guide

ZTE UMTS Dual-Band DC-HSDPA feature guide

ZTE UMTS 4C-HSDPA feature guide

ZTE UMTS NodeB Multi-Carrier Dynamic Power Sharing Feature Guide

Documents

Transcript of ZTE UMTS NodeB Multi-Carrier Dynamic Power Sharing Feature Guide