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ZGB-02-02-001 Basic Handover

Feature Guide




ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. I


Version Date Author Approved By Remarks

V1.00 2010-10-30 Not open to the Third Party

© 2010 ZTE Corporation. All rights reserved.

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

Due to update and improvement of ZTE products and technologies, information in this document issubjected to change without notice.




ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. II

TABLE OF CONTENTS

1

Feature Property ............................................................................................. 1

2

Overview ......................................................................................................... 1

2.1.1

Feature Introduction .......................................................................................... 1

2.1.2

Correlation with Other Features ........................................................................ 2

3

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

3.1

Handover Parameter Configuration .................................................................. 4

3.2

Measurement Report Processing ...................................................................... 4

3.3

Handover Decision ........................................................................................... 6

3.4

Target Cell Selection ........................................................................................ 6

3.4.1

Intra-cell Handover ........................................................................................... 6

3.4.2

Inter-cell handover ............................................................................................ 7

3.5

Sorting Target Cell ............................................................................................ 9

3.6

Failure Penalty Policy ....................................................................................... 9

4 Parameters and Configurations..................................................................... 9

4.1.1

Parameter List .................................................................................................. 9

4.1.2

Parameter Configuration ................................................................................. 10

5

Engineering Guide ........................................................................................ 14

5.1.1

Application Scenario ....................................................................................... 14

5.1.2

Configuration Description................................................................................ 15

5.1.3

Network Impact ............................................................................................... 15

6 Related Counters and Alarms ...................................................................... 15

6.1.1

Related Counters ............................................................................................ 15

6.1.2

Alarm List (optional) ........................................................................................ 22

7 Abbreviations ................................................................................................ 22

8

Reference ...................................................................................................... 22




ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. III

FIGURES

Figure 3-1 Order of handover implementation ...................................................................... 3

Figure 4-1 BSC System Control Parameters ...................................................................... 10

Figure 4-2 Radio Basic Property of BSC Function .............................................................. 11

Figure 4-3 Handover condition configuration interface ....................................................... 12

Figure 4-4 Other parameters of cell .................................................................................... 13

TABLES

Table 3-1 Parameter list of calculating the margin of power budget ..................................... 5

Table 3-2 Description of Handover Cell Judgment Parameters ............................................ 7

Table 3-3 Target Cell Selection Policy due to Different Handover Reasons ......................... 8

Table 4-1 Parameter List ...................................................................................................... 9

Table 6-1 CS Basic Measurement Counter List .................................................................. 15

Table 6-2 Counters of Common Handover Measurement .................................................. 19

Table 6-3 Handover Measurement Counters in Adjacent Cell ............................................ 21

Table 6-4 TRX Measurement Counters .............................................................................. 22



ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. II

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ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved. Page 1

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1 Feature Property

iBSC version: [ZXG10 iBSC V6.20] but not limited to V6.20

BTS version: [No requirement for the BTS software/hardware platform]

Property: [Optional function]

Related Network Elements and Requirements:

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

2.1.1 Feature Introduction

MS continuously reports measurement report during conversation. BSC determines if

handover should be made based on the report, updates the candidate cell list and does

handover based on this list.

There are the following handover types:

Intra-cell handover: handover between similar channels in a cell;

Intra-BSC inter-cell handover: handover between similar channels in different cells that

are controlled by a BSC.

Intra-MSC inter-BSC handover: handover between similar channels in different cells that

are controlled by different BSCs under a MSC.




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Inter-MSC handover: handover between similar channels in different cells that are

controlled by different MSCs.

ZXG10 can activate various kinds of handover algorithms based on actual network

conditions. If all the algorithms are activated, they will be used in a proper order. Some

handover parameters are set at cell level and some are set for each adjacent cell.

2.1.2 Correlation with Other Features

This feature is functionally related to the following features:

ZGF05-02-003 Handover Mode

ZGF05-02-007 Handover between Macro- and Micro-cells

ZGF05-02-008 Dynamic Handover Priority Algorithm

ZGF05-02-009 Directed-Shift Handover

ZGF05-02-013 Handover Failure Penalty

ZGF05-02-014 Rapid Level Drop Handover

ZGF05-02-015 Traffic Based Handover

ZGF05-05-001 Multi-layer Cell Structure

ZGF05-05-002 Concentric Circle Technology

ZGF05-09-006 Co-BCCH

Features like Handover between Macro- and Micro-cells, Directed-Shift Handover,

Rapid Level Drop Handover, and Traffic Based Handover can be categorized into the

handover types described in this feature.

The relation between this feature and <ZGF05-02-008 Dynamic Handover Priority Algorithm> : target cell of this feature is sorted by dynamic priority method. There are two

methods to sort the target cells, dynamic priority and power budget. First sort the target

cells based on dynamic priority, and then sort them based on power budget if dynamic

priority is the same.

The relation between this feature and Failure Penalty: the contents of failure penalty

is described in detail in the <ZGF05-02-013 Handover Failure Penalty> feature

description.




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The relation between this feature and Multi-layer Cell Structure: the cell layer

structure is used in cell layer configuration and target cell selection.

The relation between this feature, Concentric Circle Technology, and Co-BCCH:

Intra-cell handover of this feature includes sub-cell handover, and sub-cell handover will

happen if Concentric Circle Technology or Co-BCCH feature is activated.

3 Technical Description

Figure 1 shows the order of handover implementation, including handover parameter

configuration, measurement report processing, handover decision, target cell selection,

target cell sorting, failure penalty policy, and handover execution. Handover execution is

not described in this document.

Figure 3-1 Order of handover implementation

Start

Measurementreportprocessing

Handover

decision

Targetcell

selection

Targetcellsorting

End

Layerselection

policy

Handover

decisioncriterion

Priorityofhandover

algorithm

Handoverdecisionbased

onhandoverthreshold

PrioritysortingPowerbudgetmargin

sorting

HandoverParameter

Configuration

Failurepenalty

policy

Saveand

average

Handover

execution




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3.1 Handover Parameter Configuration

In normal network plan, Cell structure is divided intofour layers: umbrella cell, macro-cell,

micro-ell and pico-cell. For detailed description of cell layer setting, please refer to"ZGF05-05-001 Multi-layer Cell Structure" feature description.

For the parameter configuration of various handover algorithms, please refer to the

feature description of related algorithms: "ZGF05-02-007 Handover between Macro- and

Micro-cells", "ZGF05-02-009 Directed-Shift Handover", "ZGF05-02-014 Rapid Level Drop

Handover", "ZGF05-02-015 Traffic Based Handover", "ZGF05-05-002 Concentric Circle

Technology" and "ZGF05-09-006 Co-BCCH".

3.2 Measurement Report Processing

Measurement report is the original data for handover decision. ZTE GSM system

uses slide window mechanism and weighted average method.

To avoid the adverse influence on burst measurement value caused by complicated

radio transmission environment, we use a series of measurement data to do handover

decision, namely slide window mechanism. Slide window mechanism means that during

average calculation process, the oldest data is discarded and newest data is added. So

the number of data to be averaged keeps unchanged. The number of data is also the size

of slide window. The average calculation is done only if the number of accumulated data

is more than slide window size.

The reason of using weighted average is that DTX( Discontinuous Transmission)

may be used on uplink/downlink. DTX mode means that the system does not transmit

signals during the speech intermission of subscriber conversation. For non-DTX mode, it

is more accurate since it is the average value of measurement results of all timeslots. For

DTX mode, it is less accurate since it is the average value of measurement results of

some timeslots. During the averaging process, give a weight more than 1 for the data

with higher reliability. This is the meaning of weighted average.

The measurement report processing has following features:

Do preprocessing only after the number of measurement reports reach the size ofslide window. By default, the size of slide window is 4.

If DTX is enabled, the accuracy of level and quality values in measurement report

may be compromised. So the weight of measurement report with DTX is different from

that without DTX. The weight of measurement report is 1 if DTX is enabled. The weight of

measurement report can be set to (1, 2, 3) if DTX is disabled, 2 by default.

ZeroAllowed is a parameter defined as the maximum number that measurement

reports can be lost at most. If the number of lost measurement reports exceeds

ZeroAllowed, current calculation is skipped and the slide window begins the next




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collection of measurement reports. For the lost measurement report, it is considered as 0

(that is, -110dBm), and the value is not used in average calculation. For example:

If the (K-1)th measurement report is lost and the average window size is 8, average

= 1/7 (RXLEV_NCELL(K)+0+RXLEV_NCELL(K-2)+....+RXLEV_NCELL(K-7)).

Current power in measurement report will be used to calculate the subsequent

PBGT.

If the downlink data within this measurement period is valid and the average of

downlink level is provided, PBGT value of this adjacent cell can be calculated based on

formula (1) and (2):

PaPWR_C_D]L[AvRxLev_D-ell(n)AvRxLev_NCPBGT(n) (1)

ity(n))MS_Capabilwr_Max(n),Min(MS_TxP-ity)MS_Capabilwr_Max,Min(MS_TxPPa

BS_TxPwr -MaxBS_TxPwr_ PWR_C_D

(2)

For margin of power budget, please refer to formula (3):

0)( _ )()( n MARGIN HOn PBGT n PBGT (3)

Table 3-1 describes the parameters in formula (1), (2), and (3).

Table 3-1 Parameter list of calculating the margin of power budget

Parameter Meaning

AvRxLev_NCell (n) Average of downlink level in adjacent cell

and received by MS

AvRxLev_DL Average of downlink level in serving cell for

MS

BS_TxPwr_Max Max power of base station

BS_TxPwr Actual power of base station

MS_TxPwr_Max Max power of serving cell for MS

MS_TxPwr_Max(n) Max power of adjacent cell for MS

MS_Capability Power capability of serving cell for MS

MS_Capability (n) Power capability of adjacent cell for MS




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HO_MARGIN(n) Power budget threshold

3.3 Handover Decision

BSC judges if the handover conditions are met in order. Once a handover condition

is met, the handover is executed. In general, the priority of intra-cell handover algorithm

is higher than that of inter-cell handover algorithm. Intra-cell handover algorithm includes

subcell handover and uplink/downlink interference handover. Inter-cell handover

algorithm includes uplink/downlink quality handover, uplink/downlink level handover,

MS-BS hyper-long handover, rapid level drop, PBGT handover, macro-micro handover,

directed-shift handover, traffic handover (initiated by BSC), query handover (initiated by

MSC), and directed retry.

The priority order of handover algorithm is described as follows:

Subcell handover > uplink/downlink interference handover > uplink/downlink quality

handover > uplink/downlink level handover > MS-BS hyper-long handover > rapid level

drop > PBGT handover > macro-micro handover > directed-shift handover.

Note that traffic handover and query handover are actively initiated by BSC and MSC,

respectively. Directed retry is initiated during call establishment, so theprocess is different

from those based on above handover algorithm.

Except “uplink/downlink quality handover ” and “uplink/downlink level handover” algorithm,there is ON/OFF setting for each handover algorithm, in order to facilitate on-site

configuration.

Note that handover criteria should be set higher than power control criteria on the same

decision condition, in order to dopower controlfirstly.

3.4 Target Cell Selection

3.4.1 Intra-cell Handover

Serving cell need not be replaced for intra-cell handover. You only need change

carrier and timeslot. First select carrier. If the carrier is same, select the timeslot with the

lowest interference band for handover. If the interference band is same, select any

timeslot to do handover.

Intra-cell handover also includes inter-subcell handover, please refer to

"ZGF05-05-002 Concentric Circle Technology" and "ZGF05-09-006 Co-BCCH".




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3.4.2 Inter-cell handover

If inter-cell handover occurs, you should consider layer selection policy and

handover decision criterion to select the target cell.

For detailed description of layer selection policy, please refer to "ZGF05-05-001

Multi-layer Cell Structure".

The handover decision criterions are outlined as follows:

Criterion 1: AvRxLevNCell(n) > RXLEV_MIN(n) + MAX(0,(MS_TXPWR_MAX(n)- P(n))

Criterion 2: PBGT(n) > HO_MARGIN(n)

Criterion 3: AvRxLevNCell(n) > avRxLevDL + HO_MARGIN_LEVEL(n)

Criterion 4: AvRxLevNCell(n) > avRxLevDL + HO_MARGIN_QUAL(n)

Table 3-2 describes the parameters mentioned in the criterions above.

Table 3-2 Description of Handover Cell Judgment Parameters

Parameter Meaning

RXLEV_MIN(N) The minimum reception level requiredfor handover to this adjacent cell

PBGT(N) Power budget of this adjacent cell

HO_MARGIN(N) Power budget threshold of handover tothis adjacent cell

HO_MARGIN_QUAL(N)

Quality level threshold of handover tothis adjacent cell

HO_MARGIN_LEVEL(N)

Level threshold of handover to thisadjacent cell

MS_TXPWR_MAX(n)

Max power allowed in this adjacent cellfor MS

P (n) Power capability of adjacent cell for MS

avRxLevDL Average of downlink level for current

MS AvRxLevNcell (N) Average of downlink level in this

adjacent cell

You can combine criterion 1~4 to select the target cell. Criterion 1 is a

necessaryrequired condition, which means the average level of the handover-to adjacent

cell must be larger than the minimum handover level.

Comprehensively consider layer selection policy and handover decision criterion, the

policies to select the target cell due to different handover reasons are listed in Table 3-3




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Table 3-3 Target Cell Selection Policy due to Different Handover Reasons

HandoverCauses

Layer selection policyHandover decision

criterion

Subcellhandover

Pico timer invalid Criterion 1

Uplink/downlinkinterferencehandover


UL/DL QualityHandover

If pico timer is valid, select the cell in thesequence of upper layer - same layer -lower layer.

Criterion 1&4

UL/DL LevelHandover

If pico timer is valid, select the cell in thesequence of upper layer - same layer -lower layer.

Criterion 1&3

MS-BSUltra-DistanceHandover

If pico timer is valid, upper layer ispreferred, otherwise the same layer ispreferred.

Criterion 1

Rapid LevelDrop Handover

Pico timer is invalid. Related cell ispreferred. If there is no related cell, selectthe cell in the sequence of upper layer -same layer - lower layer.

Criterion 1

PBGTHandover

Determine it based on serving cellparameter, PbgtHoLayer

Criterion 1&2

Handover fromMacro- toMicro-cell

Only lower layer Criterion 1

Directed-shifthandover


Traffic handover Pico timer invalid Criterion 1

SolicitingHandover


Criterion 1

Directed retryindication


Criterion 1

Note that the pico timer is set during the handover initialization, which is performed

after the access of MS in the case of immediate assignment, assignment or handoff.Before the pico timer expires, handover is performed according to the sequence: upper

layer - same layer - lower layer. But when the pico timer expires, handover is performed

in the sequence: same layer - upper layer - lower layer.

Sort the target cells after the proper adjacent cells are searched out, then the best

cell is selected finally.




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3.5 Sorting Target Cell

There are 3 decisive factors for sorting target cell: priority, traffic and radio condition.

Priority and traffic are the main factors, if these two factors lead to same results, radiocondition is picked up to sort..

Priority comprises static priority and dynamic priority.The static priorities for different

target cells is set based on network traffic and handover success rate. The system

prefers to handover to the target cell with higher priority. Also, the system can

automatically adjust the priority of target cell and set the dynamic priority based on traffic

and congestion in target cell.

The rule of sorting adjacent cells is described as follows:

First sort target cells based on cell priority. If dynamic priority is set, dynamic priority is

used, if not, static priority is used.

If two cells have the same priorities, sort target cell based on power budget margin.

For detailed information about dynamic priority, please refer to "ZGF05-02-008 Dynamic

Handover Priority Algorithm".

If the priority of target cell is same, sort it based on power budget margin.

3.6 Failure Penalty PolicyHandover failure penalty is effective to prevent recurrence of failure and improve

handover success rate. For detailed information about failure penalty, please refer to

"ZGF05-02-013 Handover Failure Penalty".

4 Parameters and Configurations

4.1.1 Parameter List

Table 4-1 Parameter List

SN Name Figure

1 HoIntraEnable Figure 4-1

2 InHoEnable Figure 4-2

3 HoMinInterval Figure 4-3

4 Preprocess Figure 4-4




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4.1.2 Parameter Configuration

Figure 4-1 BSC System Control Parameters

Full name BSC intra cell handover enable

Abbreviation HoIntraEnable

3GPP name —

3GPPreference

—

Description

It means that it can be handed over to another channel withless interference in the same cell if current channel has greatinterference, in order to improve the conversation quality. DoNOT select „No‟ if there is no specific reason.

Managedobject

BSC

Value range Yes, No

Unit None

Default value Yes

Relatedfeatures

—

Relatedparameters

—




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Relatedinterfaces

—

Figure 4-2 Radio Basic Property of BSC Function

Full name Inter-Cell handover allowed

Abbreviation InHoEnable

3GPP name —

3GPPreference

—

Description

According to GSM specifications, intra-BSC inter-cell handoveris implemented by the following methods: BSC controlledinter-cell handover without MSC involvement. MSC controlledinter-cell intra-BSC handover whose handover flow is similar tothat of inter-BSC handover. This parameter decides the choiceof method for inter-cell intra-BSC handover. Do NOT select„No‟ if there is no specific reason.

Managedobject

BSC

Value range Yes, No

Unit None




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Default value Yes

Relatedfeatures

—

Relatedparameters

—

Relatedinterfaces

—

Figure 4-3 Handover condition configuration interface

Full name MIN interval between inter-cell handover

Abbreviation HoMinInterval

3GPP name —

3GPPreference

—

Description

This parameter specifies the interval value for which MS waitsbefore the actual inter-cell handover occurs. Such a timer ismore predominant for MS at the boundary regions between

two cells, where inter-cell handovers occur frequently. Thisparameter helps restrict frequent inter-cell handover andguarantees call quality.

Inter-cell handover takes place when the timer exceeds thedefined interval value from the last inter-cell handover of MS.This parameter affects only the inter-cell handover, but notcommon intra-cell or inter-cell concentric handover. In addition,micro-cell has its own handover policy, so this parameter isonly effective for macro-cell layer and its above layer.

For macro-cell, the default value can be 5; for micro-cell, thedefault value can only be 0.




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Managedobject

Cell

Value range 0 ~31

Unit s

Default value 5

Relatedfeatures

—

Relatedparameters

—

Relatedinterfaces

—

Figure 4-4 Other parameters of cell

Full name Preprocessing

Abbreviation Preprocess

3GPP name —

3GPPreference

—




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Description

The survey report contains the large amount (messageamount) of Abis interface information. Preprocess of thesurvey report can be transferred to BTS to reduce the burdenof Abis interface link. After preprocess, BTS averages the

survey data of MS by its own, and reports to BSC in a lowerfrequency.

Average reporting period can be two, three or four SACCHmulti-frames (480 ms). That is, the frequency decreases fromthe original twice/s to once/2 s, so the message amount of Abisinterface decreases. However, the decrease of messageamount still depends on if the message length beforepreprocess is same as that after preprocess. Onedisadvantage of preprocess is that the handover control andpower control are not in time, which increases the possibility ofdisconnection rate. This parameter determines if to usepreprocess and its period or not.

The values are as follows: 0: Do not use preprocess

2: Use preprocess; the average reporting period is 2SACCH multi-frames



Other values: Reserved

Managedobject

Cell

Value range 0 ~ 4

Unit None

Default value 3

Relatedfeatures

—

Relatedparameters

—

Relatedinterfaces

—

5 Engineering Guide

5.1.1 Application Scenario

This feature is applied while the handover should be enabled.

When MS moves from a site coverage area to another site area or call quality drops due

to interference during conversation, a better voice channel should be used to keep the

conversation and do the proper handover based on target cell.




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If target cell and source cell are under a base station, intra-cell handover is initiated. If

target cell and source cell are under different base stations, inter-cell handover is

initiated.

The handover takes the uplink/downlink level quality and TA value, which are measured

by MS and base station, to determine if it should hand over to a cell based on handover

decision criterion and resource allocation algorithm.

5.1.2 Configuration Description

This feature does not involve adjustment of iBSC or BTS hardware configuration.

5.1.3 Network Impact

After this feature is enabled, subscriber can conversate on movement between different

cells, so network quality is improved and subscriber perception is enhanced.

To apply this feature, you should note the following issues:

Adjacent cell layer and static priority can control the handover direction.

The introduction of dynamic priority can automatically adjust the traffic distribution in the

network to relieve the network congestion.

Failure penalty policy can reduce the number of cell failures in a target cell, to improve

the network handover success rate. It is recommended that penalty period of handover

failure should be set to 10-15s.

The layer is a logic layer, irrespective of actual site type (macro site or micro site). Layer

setting may impact the priority selection of target cell during handover. The priority of

layer is higher than static or dynamic priority.

6 Related Counters and Alarms

6.1.1 Related Counters

Table 6-1 CS Basic Measurement Counter List

Counter ID What It Counts

C900060012Number of attempts on TCH/F occupancy (signaling) (forhandover)

C900060013Number of TCH/F occupancy failure (signaling) (forhandover)




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C900060016Number of TCH/F assignment failure (signaling) (forhandover)

C900060021Number of attempts on TCH/F occupancy (voice) (for

handover)C900060022 Number of TCH/F occupancy failure (voice) (for handover)

C900060040Number of attempts on TCH/H occupancy (signaling) (forhandover)

C900060041Number of TCH/H occupancy failure (signaling) (forhandover)

C900060044Number of attempts on TCH/H occupancy (voice) (forhandover)

C900060045 Number of TCH/H occupancy failure (voice) (for handover)

C900060048Number of attempts on TCH/H occupancy (data) (forhandover)

C900060049 Number of TCH/H occupancy failure (data) (for handover)

C900060052 Call drop due to handover failure (On SDCCH)

C900060082Handover attempts due to uplink receiving intensity (onTCH/F)

C900060083Handover attempts due to downlink receiving intensity (onTCH/F)

C900060084 Handover attempts due to uplink quality (on TCH/F)

C900060085 Handover attempts due to downlink quality (on TCH/F)

C900060086 Handover attempts due to uplink interference (on TCH/F)

C900060087Handover attempts due to downlink interference (onTCH/F)

C900060088 Handover attempts due to C/I (on TCH/F) (C/I is good)

C900060089 Handover attempts due to C/I (on TCH/F) (C/I is bad)

C900060090 Handover attempts due to PBGT (on TCH/F)

C900060091 Handover attempts due to too big TA (on TCH/F)

C900060092 Handover attempts due to other reasons (on TCH/F)

C900060093Number of executed outgoing handover between cellscontrolled by BSC

C900060094Number of successful outgoing handover between cellscontrolled by BSC

C900060095 Number of executed outgoing handover controlled by MSC

C900060096Number of successful outgoing handover controlled byMSC

C900060097Number of executed incoming handover between cellscontrolled by BSC

C900060098Number of successful incoming handover between cellscontrolled by BSC

C900060099Number of executed incoming handover controlled byMSC (common)




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C900060100Number of executed incoming handover controlled byMSC (forced release)

C900060101Number of executed incoming handover controlled by

MSC (queuing)

C900060102Number of successful incoming handover controlled byMSC

C900060119 Number of Intra-Cell handover executions

C900060120 Number of successful intra-cell handover

C900060151 Call drop due to handover failure (On TCH/H voice)

C900060156Number of TCH/F assignment failure (voice version 1)(Channel activation failure) (for handover)

C900060157Number of TCH/F assignment failure (voice version 1)(BTS connection failure) (for handover)

C900060158 Number of TCH/F assignment failure (voice version 1)(BIU connection failure) (for handover)

C900060159Number of TCH/F assignment failure (voice version 1)(TCU connection failure) (for handover)



C900060162Number of TCH/F assignment failure (voice version 2)(BIU connection failure) (for handover)

C900060163Number of TCH/F assignment failure (voice version 2)

(TCU connection failure) (for handover)



C900060166Number of TCH/F assignment failure (voice version 3)(BIU connection failure) (for handover)

C900060167Number of TCH/F assignment failure (voice version 3)(TCU connection failure) (for handover)

C900060168 Number of successful TCH/F handover (voice)

C900060169

Number of TCH/F assignment failure (data) (Channel

activation failure) (for handover)

C900060170Number of TCH/F assignment failure (data) (BTSconnection failure) (for handover)

C900060171Number of TCH/F assignment failure (data) (BIUconnection failure) (for handover)

C900060172Number of TCH/F assignment failure (data) (TCUconnection failure) (for handover)

C900060173 Number of successful TCH/F handover (data)

C900060179Number of TCH/H assignment failure (voice version 1)(Channel activation failure) (for handover)




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C900060180Number of TCH/H assignment failure (voice version 1)(BTS connection failure) (for handover)

C900060181Number of TCH/H assignment failure (voice version 1)

(BIU connection failure) (for handover)

C900060182Number of TCH/H assignment failure (voice version 1)(TCU connection failure) (for handover)

C900060187Number of TCH/H assignment failure (voice version 2)(Channel activation failure) (for handover)


C900060189Number of TCH/H assignment failure (voice version 2)(BIU connection failure) (for handover)


C900060195 Number of TCH/H assignment failure (voice version 3)(Channel activation failure) (for handover)


C900060197Number of TCH/H assignment failure (voice version 3)(BIU connection failure) (for handover)


C900060201 Number of successful TCH/H handover (voice)

C900060206Number of TCH/H assignment failure (data) (Channelactivation failure) (for handover)

C900060207Number of TCH/H assignment failure (data) (BTSconnection failure) (for handover)

C900060208Number of TCH/H assignment failure (data) (BIUconnection failure) (for handover)

C900060209Number of TCH/H assignment failure (data) (TCUconnection failure) (for handover)

C900060212 Number of successful TCH/H handover (data)

C900060213Number of executed incoming handover controlled by BSC(forced release)

C900060214Number of executed incoming handover controlled by BSC

(queuing)

C900060215Number of executed incoming handover controlled by BSC(forced handover)

C900060216Number of executed incoming handover controlled byMSC (forced handover)

C900060219 Call drop due to handover failure (On TCH/F signaling)

C900060220 Call drop due to handover failure (On TCH/F voice)

C900060221 Call drop due to handover failure (On TCH/F data)

C900060222 Call drop due to handover failure (On TCH/H signaling)

C900060223 Call drop due to handover failure (On TCH/H data)




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C900060224Handover attempts due to uplink receiving intensity (onTCH/H)

C900060225Handover attempts due to downlink receiving intensity (on

TCH/H)

C900060226 Handover attempts due to uplink quality (on TCH/H)

C900060227 Handover attempts due to downlink quality (on TCH/H)

C900060228 Handover attempts due to uplink interference (on TCH/H)

C900060229Handover attempts due to downlink interference (onTCH/H)

C900060230 Handover attempts due to C/I (on TCH/H) (C/I is good)

C900060231 Handover attempts due to C/I (on TCH/H) (C/I is bad)

C900060232 Handover attempts due to PBGT (on TCH/H)

C900060233 Handover attempts due to too big TA (on TCH/H)

C900060234 Handover attempts due to other reasons (on TCH/H)

Table 6-2 Counters of Common Handover Measurement


C901090001Number of attempts on outgoing handover between cellscontrolled by BSC

C901090004Number of attempts on outgoing handover controlled byMSC

C901090005Number of failed request of outgoing handover controlled by

MSC with unknown reasons

C901090006Number of failed request of outgoing handover controlled byMSC with unavailable terrestrial resources

C901090007Number of failed request of outgoing handover controlled byMSC with unavailable radio resources

C901090008Number of failed request of outgoing handover due to otherreasons and controlled by MSC

C901090011Number of attempts on incoming handover between cellscontrolled by BSC

C901090013Number of forced release attempts on incoming handovercontrolled by BSC

C901090015Number of attempts on incoming handover queuingcontrolled by BSC

C901090017Number of forced handover attempts on incoming handovercontrolled by BSC

C901090020Total number of incoming handover queuing controlled byBSC

C901090021 Number of incoming handover queuing controlled by BSC

C901090022Total number of successful incoming handover queuingcontrolled by BSC

C901090023 Number of successful queuing of incoming handover




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controlled by BSC

C901090024Number of attempts on incoming handover controlled by

MSCC901090025 A interface incoming handover failure due to circuit blocking

C901090026 A interface incoming handover failure due to unmatchedcircuit groups

C901090027 A interface incoming handover failure due to unavailableradio resource

C901090028 A interface incoming handover failure due to other reasons

C901090030Number of forced release attempts on incoming handovercontrolled by MSC

C901090032Number of attempts on incoming handover queuingcontrolled by MSC

C901090034Number of forced handover attempts on incoming handovercontrolled by MSC

C901090037Total number of incoming handover queuing controlled byMSC

C901090038 Number of incoming handover queuing controlled by MSC

C901090039Total number of successful incoming handover queuingcontrolled by MSC

C901090040Number of successful queuing of incoming handovercontrolled by MSC

C901090105 Number of attempts on intra-cell handover

C901090108Number of attempts on intra-cell handover from the innercircle to the outer circle

C901090109Number of successful intra-cell handover from the innercircle to the outer circle

C901090110Number of attempts on intra-cell handover from the outercircle to the inner circle

C901090111Number of successful intra-cell handover from the outercircle to the inner circle

C901090112Number of attempts on intra-cell handover from the innercircle to the inner circle

C901090113Number of successful intra-cell handover from the innercircle to the inner circle

C901090114Number of attempts on intra-cell handover from the outercircle to the outer circle

C901090115Number of successful intra-cell handover from the outercircle to the outer circle

C901090122 Number of intra-cell handover attempts from TCH/F

C901090123Number of intra-cell handover executions from TCH/F toTCH/F

C901090124Number of intra-cell handover success from TCH/F toTCH/F




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C901090125Number of intra-cell handover executions from TCH/F toTCH/H

C901090126 Number of intra-cell handover success from TCH/F toTCH/H

C901090127 Number of intra-cell handover attempts from TCH/H

C901090128Number of intra-cell handover executions from TCH/H toTCH/F

C901090129Number of intra-cell handover success from TCH/H toTCH/F

C901090130Number of intra-cell handover executions from TCH/H toTCH/H

C901090131Number of intra-cell handover success from TCH/H toTCH/H

C901090132 Number of inter-cell handover attempts from TCH/F

C901090133Number of inter-cell handover executions from TCH/F toTCH/F

C901090134Number of inter-cell handover success from TCH/F toTCH/F

C901090135Number of inter-cell handover executions from TCH/F toTCH/H

C901090136Number of inter-cell handover success from TCH/F toTCH/H

C901090137 Number of inter-cell handover attempts from TCH/H

C901090138 Number of inter-cell handover executions from TCH/H toTCH/F

C901090139Number of inter-cell handover success from TCH/H toTCH/F

C901090140Number of inter-cell handover executions from TCH/H toTCH/H

C901090141Number of inter-cell handover success from TCH/H toTCH/H

C901090148 Number of invalid Intra-cell handovers

Table 6-3 Handover Measurement Counters in Adjacent Cell


C901100001 Times of attempts to hand over to the adjacent cell

C901100002 Times of successful outgoing handover to the adjacent cell

C901100003Times of attempts to hand over from the adjacent cell to thelocal cell

C901100004Times of successful handover from the adjacent cell to thelocal cell




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Table 6-4 TRX Measurement Counters


C901230001 Number of intra-cell incoming handover executions

C901230002 Number of successful intra-cell incoming handover

C901230003Number of executed incoming handover between cellscontrolled by BSC

C901230004Number of successful incoming handover between cellscontrolled by BSC

C901230005Number of executed incoming handover between cellscontrolled by MSC

C901230006 Number of MSC controlled successful inter-cell handover

6.1.2 Alarm List (optional)

None

7 Abbreviations

BSC Base Station Controller

BTS Base Transceiver Station

MS Mobile Station

PBGT Power Budget

8 Reference

ZXG10 BSS (V6.20) Base Station Subsystem Radio Parameter Manual

ZXG10 iBSC (V6.20) Base Station Controller Performance Counter Manual

ZGF05-02-003 Handover Mode

ZGF05-02-007 Handover between Macro- and Micro-cells

ZGF05-02-008 Dynamic Handover Priority Algorithm

ZGF05-02-009 Directed-Shift Handover

ZGF05-02-013 Handover Failure Penalty




Document Title

ZGF05-02-014 Rapid Level Drop Handover

ZGF05-02-015 Traffic Based Handover

ZGF05-05-001 Multi-layer Cell Structure

ZGF05-05-002 Concentric Circle Technology

ZGF05-09-006 Co-BCCH

Documents

ZGB-02-02-001 Basic Handover_FG_20101030.pdf