92952358 zte parameters

ZXG10-BSSBase Station Subsystem

Operation Manual (Radio Parameters)

Version 2.80

ZTE CORPORATIONZTE Plaza, Keji Road South,Hi-Tech Industrial Park,Nanshan District, Shenzhen,P. R. China518057Tel: (86) 755 26771900 800-9830-9830Fax: (86) 755 26772236URL: http://support.zte.com.cnE-mail: [email protected]

LEGAL INFORMATION

Copyright 2005 ZTE CORPORATION.

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The contents of this document and all policies of ZTE CORPORATION, including without limitation policies related to support or training are subject to change without notice.

Revision History

Date Revision No. Serial No. Description

2005/09/30 R1.0 sjzl20060086

ZTE CORPORATIONValues Your Comments & Suggestions!Your opinion is of great value and will help us improve the quality of our product documentation and offer better services to our customers.

Please fax to: (86) 755-26772236; or mail to Publications R&D Department, ZTE CORPORATION, ZTE Plaza, A Wing, Keji Road South, Hi-Tech Industrial Park, Shenzhen, P. R. China 518057.

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Document Name ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Radio Parameters)

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Contents

About this Operation Manual.............................................................ix

Purpose of this Operation Manual.......................................................................x

Typographical Conventions..............................................................................xi

Mouse Operation Conventions..........................................................................xii

Safety Signs................................................................................................xii

How to Get in Touch.....................................................................................xiii

Customer Support.................................................................................................xiii

Documentation Support..........................................................................................xiii

Chapter 1............................................................................14

Overview.......................................................................................14

Radio Resource Management..........................................................................15

Precautions in Radio Parameters Adjustment.......................................................16

Chapter 2............................................................................18

BS System Radio Parameters...........................................................18

BS Controller Parameters...............................................................................19

Basic Property Parameters.......................................................................................19

Timer Parameters.................................................................................................23

GPRS Maximum Retrying Times Parameters.................................................................45

GPRS Timer Parameters..........................................................................................48

Other GPRS Property Parameters...............................................................................51

Dynamic HR Property Parameters..............................................................................56

BVC Flow Control Property Parameters .......................................................................57

BS Parameters............................................................................................59

External Cell Parameters................................................................................59

3G External Cell Parameters...........................................................................66

Chapter 3............................................................................68

Cell Parameters..............................................................................68

Basic Parameters 1.......................................................................................69

Basic Parameters 2.......................................................................................74

Optional Parameters.....................................................................................80

Cell Selection Parameters...............................................................................84

Service Process Additional Parameters...............................................................89

System Parameters......................................................................................95

Cell Optional Parameters..............................................................................100

Other Parameters.......................................................................................103

GPRS Cell Reselection Parameters..................................................................106

GPRS NC Survey Parameters.........................................................................114

GPRS Cell Options Prameters.........................................................................118

GPRS Other Parameters...............................................................................123

GPRS Channel Parameters............................................................................127

GPRS Power Control Parameters....................................................................132

Dynamic HR Parameters..............................................................................135

Chapter 4..........................................................................139

Cell Object Parameters..................................................................139

TRX Parameters.........................................................................................140

Interference Cell Parameters.........................................................................140

CA Frequency parameters............................................................................141

Power Control Parameters............................................................................142

Power Survey Parameters......................................................................................142

Power Adjust Threshold Parameters..........................................................................145

Power Control Parameters......................................................................................150

Other Parameters................................................................................................150

GPRS Power Control parameters..............................................................................153

Handover Control Parameters........................................................................156

Handover Pretreatment Parameters..........................................................................156

Handover Threshold Parameters..............................................................................161

Handover Condition Parameters...............................................................................168

Handover Control Parameters.................................................................................171

Other Parameters................................................................................................172

Handover Arithmetic Parameters..............................................................................174

Adjacent Cell Handover and Reselection Parameters............................................177

Adjacent Cell Handover Parameters................................................................181

Adjacent Cell Reselection Parameters..............................................................182

Frequency Hopping System Parameters...........................................................182

Channel Parameters....................................................................................182

3G Cell Control Parameters...........................................................................185

Basic Property Parameters.....................................................................................185

GPRS Property Parameters.....................................................................................190

3G Handover Control Parameters...................................................................194

3G Adjacent Cell Reselection Parameters..........................................................196

3G Handover Cell Parameters........................................................................196

3G Handover and Reselection Parameters.........................................................198

Figures..............................................................................199

Tables...............................................................................201

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About this Operation Manual

ZXG10 is a GSM mobile communication system independently developed by ZTE Corporation. It is composed of ZXG10-MSS Mobile Switching Subsystem and ZXG10-BSS Base Station Subsystem. Providing and managing radio transmission in GSM, ZXG10-BSS comprises of equipments such as ZXG10-BSC Base Station Controller and ZXG10-BTS Base Transceiver Station.

ZXG10-BSC (V2) is 2nd generation base station controller product of ZTE. It has large capacity, high reliability, high cost-performance ratio, perfect functions and strong service supporting capability.

ZXG10-BSS (V2.80) consists of ZXG10-BSC (V2.80) Base Station Controller and ZXG10-BTS Base Transceiver Station (a generic term for ZTE series BTSs).

ZXG10-OMCR (V2.80) is the operation and maintenance platform for ZXG10-BSS (V2.80) Base Station Subsystem.

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Radio Parameters) introduces parameters of ZXG10-OMCR (V2.80) system related to radio devices and radio resource. It works with ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Configuration Management).

This set of document contains following manuals:

ZXG10-BSC (V2.80) Base Station Controller Guide to Documentation

2nd Generation Mobile Communication Technology Basic Knowledge

ZXG10-BSC (V2.80) Base Station Controller Technical Manual

ZXG10-BSC (V2.80) Base Station Controller Hardware Manual

ZXG10-BSC (V2.80) Base Station Controller Installation Manual (Hardware)

ZXG10-BSC (V2.80) Base Station Controller Installation Manual (Software)

ZXG10-BSC (V2.80) Base Station Controller Installation Manual (System Debugging)

ZXG10-BSS (V2.80) Base Station Subsystem NM Technical Manual

Confidential and Proprietary Information of ZTE CORPORATION ix

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Radio Parameters)

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Configuration Management)

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Fault Management)

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Performance Management)

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Performance Measurement Counter)

ZXG10-BSS (V2.80) Base Station Subsystem Operation Manual (Security Management & System Tool)

ZXG10-BSS (V2.80) Base Station Subsystem Command Manual

ZXG10-BSC (V2.80) Base Station Controller Maintenance Manual (Troubleshooting)

ZXG10-BSC (V2.80) Base Station Controller Maintenance Manual Routing Maintenance)

ZXG10-BSC (V2.80) Base Station Controller Maintenance Manual (Emergency Maintenance)

In this manual, BSC (V2) is for ZXG10-BSC (V2.80) in short, BSS (V2) for ZXG10-BSS and OMCR (V2) for ZXG10-OMCR (V2.80).

Purpose of this Operation ManualThis manual falls into four chapters:

Chapter 1, Overview, introduces types, management and precautions of OMCR (V2) radio parameters.

Chapter 2, BS System Radio Parameters, introduces all parameters of OMCR (V2) base station controller.

Chapter 3, Cell Parameters, introduces all radio parameters of OMCR (V2) cells, including basic parameters, optional feature parameters, cell optional parameters, service process additional parameters, system parameters and other parameters related to GPRS.

Chapter 4, Cell Object Parameters, introduces all object parameters of OMCR (V2), including parameters of TRX, interference cell, CA frequency, power control, handover control, adjacent cells handover and reselection, frequency hopping system, channels and parameters related to 3G services.

x Confidential and Proprietary Information of ZTE CORPORATION


Typographical ConventionsZTE documents employ with the following typographical conventions.

TA B L E 1 TY P O G R A P H I C A L CO N V E N T I O N S

Confidential and Proprietary Information of ZTE CORPORATION xi

Typeface Meaning

Italics References to other guides and documents.

Quotes Links on screens.

Bold Menus, menu options, function names, input fields, radio button names, check boxes, drop-down lists, dialog box names, window names.

CAPS Keys on the keyboard and buttons on screens and company name.

Constant width Text that you type, program code, files and directory names, and function names.

[ ] Optional parameters

{ } Mandatory parameters

| Select one of the parameters that are delimited by it

Note: Provides additional information about a certain topic.

Checkpoint: Indicates that a particular step needs to be checked before proceeding further.

Tip: Indicates a suggestion or hint to make things easier or more productive for the reader.


Mouse Operation ConventionsTA B L E 2 MO U S E OP E R A T I O N CO N V E N T I O N S

Safety SignsTA B L E 3 SA F E T Y S I G N S

Safety Signs Meaning

Danger: Indicates an imminently hazardous situation, which if not avoided, will result in death or serious injury. This signal word must be limited to only extreme situations.

Warning: Indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.

Caution: Indicates a potentially hazardous situation, which if not avoided, could result in minor or moderate injury. It may also be used to alert against unsafe practices.

Erosion: Beware of erosion.

Electric shock: There is a risk of electric shock.

Electrostatic: The device may be sensitive to static electricity.

Microwave: Beware of strong electromagnetic field.

Laser: Beware of strong laser beam.

No flammables: No flammables can be stored.

No touching: Do not touch.

xii Confidential and Proprietary Information of ZTE CORPORATION

Typeface Meaning

Click Refers to clicking the primary mouse button (usually the left mouse button) once.

Double-click Refers to quickly clicking the primary mouse button (usually the left mouse button) twice.

Right-click Refers to clicking the secondary mouse button (usually the right mouse button) once.

Drag Refers to pressing and holding a mouse button and moving the mouse.


Safety Signs Meaning

Danger: Indicates an imminently hazardous situation, which if not avoided, will result in death or serious injury. This signal word must be limited to only extreme situations.

Warning: Indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.

Caution: Indicates a potentially hazardous situation, which if not avoided, could result in minor or moderate injury. It may also be used to alert against unsafe practices.

No smoking: Smoking is forbidden.

How to Get in TouchThe following sections provide information on how to obtain support for the documentation and the software.

Customer SupportIf you have problems, questions, comments, or suggestions regarding your product, contact us by e-mail at [email protected]. You can also call our customer support center at (86) 755 26771900 and (86) 800-9830-9830.

Documentation SupportZTE welcomes your comments and suggestions on the quality and usefulness of this document. For further questions, comments, or suggestions on the documentation, you can contact us by e-mail at [email protected]; or you can fax your comments and suggestions to (86) 755 26772236. You can also explore our website at http://support.zte.com.cn, which contains various interesting subjects like documentation, knowledge base, forum and service request.

Confidential and Proprietary Information of ZTE CORPORATION xii i

C h a p t e r 1

Overview

In this chapter, you will learn about: Radio Resource Management

Precautions in Radio Parameters Adjustment

Confidential and Proprietary Information of ZTE CORPORATION 14

Chapter 1 - Overview

900/1800 MHz TDMA digital cell mobile communication system (GSM) is an integrated system covering fields of network technology, digital stored program control technology, all transmission technologies and radio technologies. GSM usually falls into Network Sub System (NSS), Base Station Sub-system (BSS) and Mobile Station (MS). GSM system, in signaling structure, usually covers MAP interface, A interface (between MSC and BSC), Abis interface (between BSC and BTS0 and Um interface (between BTS and MS, also called air interface). All these objects and interfaces contain large quantity of configuration parameters and property parameters, some of which are determined during the development and producing of the equipment, and most of which depend on actual need and operation by network providers. Settings and adjustment of latter parameters have a great impact on the operation of entire GSM network.

Radio parameters in GSM network refer to parameters related to radio devices and radio resources. These parameters have an important impact on cover of cells, distribution of signaling flow and service property of network, etc. therefore, adjusting radio parameters reasonably plays a very important part in GSM network optimization. GSM radio parameters, according to objects radio parameters serve in the network, fall into project parameters and resource (cell) parameters. Project parameters refer to parameters related to design, installation and commissioning of the project, like antenna height, antenna direction, antenna gain, antenna download obliquity and cable loss, etc. These parameters must be determined in network design and are seldom changed during the operation of the network. Resource (cell) parameters refer to parameters related to configuration and utilization of radio resource, which usually transmit on radio interface (Um) to keep the consistence of base station and mobile station. Radio parameters covered in this manual are mainly resource parameters.

Radio Resource ManagementRadio resource objects in BSC: Base Station Controller (BSC), SITE, Base Transceiver Station (BTS), Transceiver (TRX), Radio Carrier (RADIOCARRIER), Logic Service Channel (CHAN), Handover Channel (HOC), Power Control Parameter (POC), Adjacent Handover Cell (AHANDOVERCELL), Adjacent Reselection Cell (ARESELECTCELL), Adjacent Handover and Reselection Cell (AHO&RESELECTCELL), Interference Cell (ICELL), Logic PCM (PCMCIRCUIT), Logic Lapd (LAPDLINK), Frequency Hopping System (FHS), GPRS Cell (GPRSCELL), BVC Flow Control (BVCflowCtrl), 2G/3G Cell handover Control (2G/3GHOC) and Dynamic HR (DynaHR).

Select Configuration Management Radio Resource Management from main interface of OMCR (V2) (as shown in Figure 1) after successful login, and ZXG10 Radio Resource Management interface pops up.



F I G U R E 1 MA I N I N T E R F A C E

The main interface shows three windows: tree in the left window shows objects to be created and maintained, right window describes relationship between BSC and SITE giving logical illustration, and the window below shows the man-machine command MMI command created by the operations. The status bar shows linking status with server and machine number of the client terminal.

Precautions in Radio Parameters AdjustmentRadio parameters adjustment, according to property of the problem to be solved, fall into two kinds. The first kind is to solve static problem, that is, to correct traffic model in system design by measuring actual average traffic and signaling flow in every district and to solve common problems existing for long. The other kind is to solve problems in some time like traffic overload in some district, channel congestion due to sudden events or random events.

Service provides must perform measurement and summarization on actual operation regularly, and then perform appropriate adjustment on global or partial parameters and configurations, for first kind. Network operators adjust some radio parameters at real time according to instant data from measurement personnel, for second kind.

16 Confidential and Proprietary Information of ZTE CORPORATION

Chapter 1 - Overview

Most radio parameters in GSM system are based on one cell or one district. It is necessary to consider whether parameter adjustment in this district will influence other districts, especially adjacent one, for parameters between districts are related to each other greatly. Otherwise, it may cause bad influence. Determine whether the problem results from equipment fault (including connections) first when it occurs in some part of the network. Adjust radio parameters only when determining that the problem does result from service.


C h a p t e r 2

BS System Radio Parameters

In this chapter, you will learn about: BS Controller Parameters

BS Parameters

External Cell Parameters

3G External Cell Parameters


Chapter 2 - BS System Radio Parameters

BS Controller ParametersBasic Property Parameters1. BSCID

Description: To uniquely identify a BSC

Value range: 1 ~ 255

2. Alias

Description: BSC alias

3. Mobile Country Code (MCC)

Description: Consisting of three decimal scale numbers, to uniquely identify the home country of the mobile subscriber (or system)


Default value: 460

4. Mobile Network Code (MNC)

Description: Consisting of two decimal scale numbers, to uniquely identifies a specific GSM PLMN network in a country (decided by MCC)

Value range: 0 ~ 99

Default value: 0

5. LoadValidTime (10 s)

Description: To periodically send BSSAP LOAD INDICATION message to MSC during load indication, notifying it of the load status. The message consists of time indication information and indicating valid time length of the service load information. The MSC notifies neighboring BSC of the information in the BSSAP LOAD INDICATION message. These parameters are to indicate valid time length of the load information.

Value range: See Table 4 for value range of LoadValidTime.

T A B L E 4 VA L U E RA N GE O F LO A DV A L I DT I M E

Value Meaning

0 Reserved

1 Valid in 10 s

254 Valid in 2540 s

255 Valid permanently

Default value: 5



6. LoadIndPrd (100ms)

Description: To periodically send BSSAP LOAD INDICATION message to MSC during load indication, notifying it of the load status. The message consists of time indication information and indicating valid time length of the service load information. The MSC notifies the neighboring BSC of the information in the BSSAP LOAD INDICATION message. This parameter determines the period for BSC to send the load indication message when the load indication message is sent periodically.

Value range: See Table 5 for value of load indication period.

T A B L E 5 VA L U E TA B L E O F LO A D IN D I C A T I O N PE R I O D

Value Duration Represented

1 0.1 s

2 0.2 s

65535 6553.5 s

Other values Reserved

Default value: 600

7. OverLevel[13][6] (13*6 = 78)

Description: To define flow control policy for a specific cell

Value range: See Table 6 for value range of flow control.

TA B L E 6 VA L U E RA N GE O F OV E RLE V E L

OverloadLevel

Barred ClassNumber

Rxlev_ Access_Min

Penalty Time

Cell selectOffset

Tx-Integer

Max- Retrans

0 0 0 0 0 0 0

1 0 0 0 0 1 -1(255)

2 0 1 0 0 2 -2(254)

3 1 2 0 -2(254) 3 -3(253)

4 2 3 0 -3(253) 4 -3(253)

5 3 4 0 -4(252) 4 -3(253)

6 4 4 0 -4(252) 4 -3(253)

7 5 4 11111 -3(253) 4 -3(253)

8 6 4 11111 -2(254) 4 -3(253)

9 7 4 11111 -1(255) 4 -3(253)

10 8 4 11111 0 4 -3(253)

11 9 4 11111 0 4 -3(253)

12 10 4 11111 0 4 -3(253)



8. InHoEnable

Description: To define whether to allow handover between cells inside a BSC. BSS supports internal handover inside a cell (handover between different channels within a same cell) and handover between cells controlled by MSC. It can also support handover between different cells inside BSS. This can be set via OMS. Internal handover between different cells of a BSS can reduce messages between BSS and MSC because message will not be sent to MSC before the execution of handover. Only after a handover is completed, will BSS send the HANDOVER EXECUTION message to MSC.

Value range: True/False

Default value: True

9. LocName

Description: Name of geographic location of a Base Station Controller

10. ResourceIndThs

Description: A threshold value that BSC automatically indicates to MSC, and ratio of present available channels to the total channels. This parameter is for the threshold of automatic indication mode. The resource indication configured by O&M must be given to MSC when available cell resources are less than the parameter, to notify the cell condition. There are four modes during the resource indication by BSC.

BSC instantly returns a message of BSSAP RESOURCE INDICATION as an acknowledgement without any resource information after receiving the BSSAP RESOURCE REQUEST message. BSC automatically sends the BSSAP RESUORCE INDICATION message to MSC, and uses the Periodicity IE in the BSSAP RESOURCE REQUEST to determine the indication messages interval (unless the Periodicity IE is 0 and BSC will ignore 0) once the auto condition (service threshold or the interval between any two messages) set by O&M of BSC is satisfied.

BSC instantly returns a message BSSAP RESOURCE INDICATION with resource information after receiving BSSAP RESOURCE REQUEST message. BSC will stop sending and will wait for the next BSSAP RESOURCE REQUEST if the BSSAP RESOURCE REQUEST message does not contain the Extended Resource Indication IE. BSC will follow the rules specified by the Subsequent Mode element in the message if so, which are the same as those of mode 4. Mode 1 or 3 is adopted if previous mode is 1 or 3. Otherwise, mode 4 applies.

BSC will immediately return a BSSAP RESOURCE INDICATION message containing resource information after receiving the BSSAP RESOURCE REQUEST message. BSC then periodically sends BSSAP RESOURCE INDICATION messages. Period to send the message is the value of Periodicity IE times 100ms if the Periodicity IE in the BSSAP RESOURCE REQUEST message is not 0. The message is wrong and the entire BSSAP RESOURCE REQUEST message is regarded as invalid if Periodicity IE is 0.

BSC instantly returns a message BSSAP RESOURCE INDICATION as an acknowledgement without any resource information after



receiving the message BSSAP RESOURCE REQUEST. Cell resource information will not be sent to MSC.

Value range: See Table 7 for value range of ResourceIndThs.

TA B L E 7 VA L U E RA N GE O F R E S O U R C E I N DTH S

Value Meaning

0 0%

1 1% 100 100%

Default value: 30

11. BSCMaxResetNum

Description: Maximum number of repeating times for BSC resetting. It will repeat entire resetting process when BSC sends the BSSAP RESET message to MSC and if the BSSAP RESET ACKNOWLEDGE message sent by MSC has not been received in a specified T4 time. The BSSAP RESET message can be repeated up to N times. MSC will end the resetting process and inform OMS if no reply is obtained after sending N messages. N depends on BscMaxResetNum parameter.

Default value: 3

12. CircMaxResetNum

Description: Maximum number of repeating times for BSC circuit resetting. It will repeat circuit resetting process when BSC sends the BSSAP RESET CIRCUIT message to MSC and if the BSSAP RESET CIRCUIT ACKNOWLEDG message has not been received in the GSM-specified T19 time. The BSSAP RESET CIRCUIT message can be repeated up to N times. MSC will end the resetting process and inform OMS if no reply is obtained after N times. N depends on CircMaxResetNum parameter.

Default value: 3

13. ConfusionMsg

Description: To determine whether to allow BSC to send the BSSAP CONFUSION message. This message is bi-directional, indicating that the received message cannot be correctly processed due to unidentified reasons. A confusion message will be sent while there are no other suitable fault messages to return,

Value range: True: Enabling BSC to send BSSAP CONFUSION messages; False: Disabling BSC to send BSSAP CONFUSION messages

Default value: False

14. ExDRSendAssignFail

Description: To determine whether to allow external customized retry to send failure indication



Value range: True/False


15. LoadInd

Description: To define whether the load indication process can be used. The load indication process is an optional item which enables neighboring BSCs to know their cell load conditions outside their boundary, so that even more information can be consulted during a common handover and during intra-BSC traffic handover. This parameter decides whether load indication process can be used, meanwhile the validity of parameters LoadValidTime and LoadIndPrd are determined, that is, when the parameter is 0 (the load indication process cannot be used), the two parameters followed are invalid, otherwise, they will be valid.

Value range: True: Available to load indication process; False: Unavailable to load indication process


16. BARANG

Description: To define broadcast range

Value range: Basic GSM900 frequency band P-GSM is ARFCN 1124, the expanded GSM900 frequency band E-GSM is ARFCN 0124 and 9751023, GSM1800 frequency band is ARFCN 512885, and railway GSM900 frequency band R-GSM is ARFCN 0124 and 9551023.

Timer Parameters1. Blocking/unblocking period

Description: BSS blocks/unblocks a land circuit and sends BLOCK/UNBLOCK message to MSC due to various reasons (O&M intervention, equipment failure/recovery, radio resources unavailable/available to name a few). A BLOCK/UNBLOCK ACKNOWLEDGE message is sent to BSS after receiving the message. This time period is defined as T1.


See Table 8 for value range of blocking/unblocking period.

TA B L E 8 VA L U E RA N GE O F B L O C K I N G /U N B L O C K I N G PE R I O D

Code Time Represented

1 0.1 s

2 0.2 s

1200 120 s


Default value: 80



2. T4: Global resetting period

Description: T4 is to monitor the message BSSAP RESET sent by BSC to MSC

Timer start conditions: T4 is started when BSC is reset globally

Timer suspend conditions: receiving BSSAP RESET ACKNOWLEDGE messages from MSC

Timeout action: BSC will repeat the process if timeout occurs in T4


See Table 9 for value range of global resetting period.

TA B L E 9 VA L U E RA N GE O F GL O B A L R E S E T T I N G PE R I O D

T4 Time Represented

100 10 s

101 10.1 s

102 10.2 s

1200 120 s


Default value: 100

3. T7: protective period for handover request

Description: T7 monitors the BSSAP HANDOVER REQUIRED message. It is maxmium period taken from the time when BSC sends BSSAP HANDOVER REQIURED message to the time when MSC returns the BSSAP HANDOVER COMMAND message. MSC can send the BSSAP HANDOVER REQUIRED REJECT message to BSC in the case of failure and so the BSC will stop the T7 timer

Timer start conditions: T7 is started when BSC sends BSSAP HANDOVER REQUIRED to MSC

Timer end conditions: receiving BSSAP HANDOVER COMMAND or BSSAP HANDOVER REQUIRED REJECT message. BSC can send other BSSAP HANDOVER REQIURED messages to MSC when the BSSAP HANDOVER REQUIRED REJECT message is received

BSC will instantly repeat the process of HANDOVER REQUIRED if T7 is timeout but external handover conditions are still satisfied


See Table 10 for value range of protective period of handover request.



TA B L E 10 VA L U E R A N G E O F PR O T E C T I V E PE R I O D F O R HA N D O V E R RE Q U E S T

T7 Time Represented

50 5 s

51 5.1 s

52 5.2 s

300 30 s


Default value: 100

4. T8: source BSC handover execution period

Description: The external handover process for T8 supervision source BSC

Timer start conditions: T8 is started when the BSSAP HANDOVER COMMAND message is received

The T8 timer will stop upon receiving the BSSAP CLEAR COMMAND message or the RIL3_RR HANDOVER FAILURE message from MSC

BSC will send BSSAP CLEAR REQUEST message to MSC when the T8 timer is timeout


See Table 11 for value range of source BSC handover executive period.

TA B L E 11 VA L U E R A N G E O F SO U R C E BSC HA N D O V E R EX E C U T I O N PE R I O D

T8 Time Represented

80 8 s

81 8.1 s

82 8.2 s

150 15 s


Default value: 120

5. T10: Assigned period

Description: T10 supervises the assigned process

Timer start conditions: T10 is started when the ASSIGNMENT COMMAND message is sent to MS

Timer end conditions: T10 timer stops when MS receives the ASSIGNMENT COMPLETE and ASSIGNMENT FAILURE messages.



BSC sends a BSSAP ASSIGNMENT FAILURE message to MSC when T10 timer expires

Value range: 40 ~140

See Table 12 for value range of assignment period.

TA B L E 12 VA L U E R A N G E O F AS S I G N M E N T PE R I O D

T10 Time Represented

40 4 s

41 4.1 s

42 4.2 s

140 14 s


Default value: 80

6. T13: Protective period for global resetting

Description: T13 is a protection time for a local call clearing process

Timer start conditions: T8 timer is started when the BSSAP HANDOVER COMMAND message is received

Timer suspend conditions: SCCP receives a SSP/SPI message

BSS sends BSSAP RESET ACKNOWLEDGEMENT message to MSC when T13 timer expires


See Table 13 for value range of protective period of global resetting.

TA B L E 13 VA L U E R A N G E O F PR O T E C T I V E PE R I O D F O R GL O B A L RE S E T T I N G


50 5 s

51 5.1 s

52 5.2 s

300 30 s


Default value: 150

7. T17: first overload period for flow control

Description: T17 timer supervises the flow control process of MSC overload



Timer start conditions: T8 timer is started when the BSSAP HANDOVER COMMAND message is received

Stop conditions for the timer: None.

Timeout action: BSC observes whether to receive message BSSAP OVERLOAD from the MSC when timer T17 expires.


See Table 14 for value range of first overload period of flow control.

TA B L E 14 VA L U E R A N G E O F F I R S T OV E R L O A D PE R I O D O F FL O W CO N T R O L


10 1 s

11 1.1 s

12 1.2 s

100 10 s


Default value: 80

8. T18: second overload period for flow control

Description: T18 timer supervises the flow control process of MSC overload

Timer start conditions: T18 timer is started and the service is degraded by one level when BSSAP HANDOVER COMMAND message is received

Stop conditions of the timer: none

Timeout action: The service is upgraded by one level when the T18 timer expires


See Table 15 for value range of second overload period of flow control.

TA B L E 15 VA L U E R A N G E O F SE C O N D OV E R L O A D PE R I O D O F FL O W C O N T R O L


30 3 s

31 3.1 s

200 20 s


Default value: 150



9. T19: circuit resetting period at the BSS side

Description: The circuits, with the exception of BSC SCCP connection, must be released to idle state, and BSS will send the BSSAP CIRCUIT RESET message to MSC to start the timer T19. MSC releases corresponding services, setting circuits to the idle state and sends BSSAP CIRCUIT RESET ACKNOWLEDGE message to BSC, after receiving the message. The Timer will stop upon receiving the RESET CIRCUIT ACKNOWLEDGE message from BSC.


See Table 16 for value range of circuit resetting period at BSS side.

TA B L E 16 VA L U E R A N G E O F C I R C U I T RE S E T T I N G PE R I O D A T BSS S I D E


1 0.1 s

2 0.2 s

1200 120 s


Default value: 80

10. T20: circuit group blocking/unblocking period

Description: BSS will block a group of terrestrial circuits for various reasons (O&M intervention; equipment fault/recovery; radio resources unavailable/available to name a few). It then sends the BSSAP CIRCIUIT GROUP BLOCK/UNBLOCK message to the MSC. MSC will send the BSSAP CIRCIUIT GROUP BLOCK/UNBLOCK ACKNOWKEDGE message to BSS for notification after receiving the message.


See Table 17 for value range of circuit group blocking/unblocking period.

TA B L E 17 VA L U E R A N G E O F C I R C U I T GR O U P B L O C K I N G / U N B L O C K I N G PE R I O D


1 0.1 s

2 0.2 s

1200 120 s


Default value: 80



11. T9101: supervises the RLSD message receiving

Description: T9101 timer supervises the RLSD message receiving.

Timer start conditions: T7 timer is started when BSC sends BSSAP HANDOVER REQUIRED to MSC

Timer suspend conditions: T9101 timer stops when the RLSD message sent by MSC is received

Timeout action: BSC will send the RLSD message to release the SCCP connection when T9101 timer expires

Value range: 100

See Table 18 for value range of T9101.

TA B L E 18 VA L U E R A N G E O F T9101


100 10 s


Settings: cannot be changed

12. T9103: supervises the channel activation process

Description: Timer T9103 is to monitor channel activation process

Timer start conditions: the timer T9103 starts when BSC sends the CHANNEL ACTIVATION message to BTS

Timer suspend condition: timer T9103 starts when BSC receives the CHANNEL ACTIVATION ACK or CHANNEL ACTIVATION NACK, message

BSC sends the RF CHANNEL RELEASE message to BTS when the timer T9103 expires

Value range: 20


TA B L E 19 VA L U E RANGE O F T9103

RmsT9103 Time Represented

20 2 s



13. T9104: supervises the CLEAR COMMAND from MSC

Description: The T9104 timer supervises CLEAR COMMAND from MSC

Timer start conditions: timer T9104 is started when BSC sends a CLEAR REQUEST message to MSC



Timer suspend conditions: Timer T9104 stops when the CLEAR COMMAND message sent by MSC is received

Resend the CLEAR REQUEST (four times at most) message when the timer T9104 expires





50 5 s

200 20 s


Default value: 150

14. T9105: supervises the SCCP connection process

Description: The timer T9105 is to monitor SCCP connection process

Timer start conditions: Timer T9105 is started when BSC sends the BSSAP SCCP_CONNECTION_REQ message to MSC

Timer suspend conditions: Timer T9105 stops when BSC receives SCCP_CONNECTION_CONFIRM/SCCP_CONNECTION_REFUSED message

BSC will send the CHANNEL RELEASE message to MS when the timer T9105 expires





20 2 s

2400 240 s


Default value: 100

15. T9108: supervises physical context request process

Description: The timer T9108 is to monitor the physical context request process

Timer start conditions: T9108 timer is started when BSC sends the PHYSICAL CONTEXT REQUEST message to BTS



Timer suspend conditions: T9108 timer stops when BSC receives the PHYSICAL CONTEX CONFIRM message from BTS

Timeout action: BSC will send ASSIGNMENT FAILURE message to MSC when the T9108 timer expires

Value range: 20




20 2 s



16. T9113: supervises the external handover in the destination cell

Description: The timer T9113 is to monitor the external handover in the destination cell

Timer start conditions: T9113 timer is started when BSC sends the HANDOVER REQUEST ACK message to MSC

Timer suspend conditions: T9113 timer stops when BSC receives a HANDOVER COMPLETE message from MS or the CLEAR COMMAND message from the MSC

BSC will send the CLEAR REQUEST message to MSC when the T9113 timer expires





80 8 s

81 8.1 s

150 15 s


Default value: 130

17. zxgT1: protection time for channel activation

Description: The protection time waiting for MS access during assignment or handover after the channel is activated



Timer start conditions: target channels receive the CHL ACTIVATION ACK message and sends RADIO AVAILABLE message

Timer suspend conditions: MS accesses and the target channel receives the ASSIGNMENT COM or the HANDOVER COM message


See Table 24 for value range of zxgT1.

TA B L E 24 VA L U E R A N G E O F Z X GT1

Value Time Represented

50 5.1 s

51 5.1 s

120 12.0 s

Default value: 70

18. zxgT2: protection time for applying a channel

Description: The protection time for applying a channel

Timer start conditions: new channels send RADIO APPLY message

Channel request succeeds and the new channel receives the RADIO AVAILABLE message or the channel request fails and the new channel receives RADIO UNAVAILABLE message or in case of queuing, the new channel receives RADIO PROCEEDING message





10 1.0 s

11 1.1 s

50 5.0 s

Note: T2 > T3103

Default value: 30

19. zxgT3: protection time for linking response

Description: The protection time waiting for the linking response of the central module during instant assignment,



Timer start conditions: Pn instance sends the ESTABLISH IND message to the P0 instance

Timer suspend conditions: Pn instance receives CONNECT CONF message sent by the P0 instance, or CONNECT FAIL message when P0 fails to establish a link.



TA B L E 26 VA L U E RA N GE O F Z X GT3


50 5.0 s

51 5.1 s

650 65.0 s

Note: T3 > T9105

Default value: 120

20. zxgT4 (100 ms)

Description: The protective waiting time for the confirmation by P0 instance to the HO COM or ASS COM message

Pn instance transfers the message to instance P0 after Pn instance receives the HO COM or ASS COM2 message from MS

Timer suspend conditions: Pn instance receives from P0 a confirmation message for HO COM or ASS COM


Default value: 30

21. zxgT5: supervises the modification process of encryption mode

Description: T5 timer supervises the modification process of encryption mode

Timer start conditions: the zxgT5 timer starts when BSC receives the CIPHER MODE COMMAND message from MSC

Timer suspend conditions: the zxgT5 timer stops when BSC receives the CIPHER MODE COMPLETE message from MS

Timeout action: when the zxgT5 timer expires, the BSSAP CIPHER MODE REJECT message is sent to MSC


See Table 27 for value range of zxT5.





50 5.0 s

51 5.1 s

120 12.0 s

Default value: 100

22. zxgT6: supervises the SAPI3 linking

Description: The zxgT6 timer supervises the SAPI3 link establishment

Timer start conditions: the zxgT6 timer starts when BSC receives the DTAP (SAPI=3) message from MSC and there is no SAP13.

Timer suspend conditions: the zxgT6 timer is suspended when BSC receives the ESTABLISH CONFIRM message from BTS

BSSMAP SAPI n REJECT message will be sent to MSC when the zxgT6 timer expires





10 1.0 s

11 1.1 s

300 30.0 s

Default value: 100

23. zxgT7: the protection time waiting for the message of P0 response assignment or handover completion

Description: The protection time waiting for the message of P0 response assignment or handover completion

Timer start conditions: Pn instance sends the HO RQD message to the P0 instance

Timer suspend conditions: Pn instance receives the response message HO CMD from the P0 instance





TA B L E 29 VA L U E RA N GE O F Z X GT7


1 0.1 s

2 0.2 s

200 20.0 s

Default value: 100

24. zxgT8 (100 ms)

Description: External handover protection time

Value range: 1650

Default value: 100

25. zxgT9

Description: RF Channel Release protection time

Timer start conditions: zxgT9 timer starts when the Pn instance sends the RF CHL REL message to the BTS when it is released

Timer stop conditions: zxgT9 timer expires when the Pn instance receives a response from the BTS





10 1.0 s

11 1.1 s

50 5.0 s

Default value: 20

26. zxgT10: The protection time for queuing requested by a channel

Description: The protection time for queuing requested by a channel







50 5.0 s

51 5.1 s

200 20.0 s

Note: T10 > T3109 + T3111 + T9103 or T10 > T11 /Tqho must be ensured if queuing is allowed

Default value: 130

27. zxgT11: Assignment for queue period

Description: Maximum allowable queue time is calculated from the assignment request


See Table 32 for value range zxgT11.



1 0.1 s

2 0.2 s

150 15 s


Default value: 60

28. zxgT12: interval for periodic status acknowledgement (100 ms)

Description: interval for periodic status acknowledgement

Timer starts fir the first time after Pn instance receives CONNECT CONF message from P0 instance and decides to perform activity check at peer end. It will then be started periodically

Pn instance receives the release type message

Value range: 10018000

Default value: 200

29. zxgT13: supervises the mode modifying procedure of BTS and MS

Description: zxgT13 timer supervises the modification process of BTS and MS modes.

Timer start conditions: the BSC sends the MODE MODIFY message messageto BTS or sends the CHANNEL MODE MODIFY message to MS



Timer stop conditions: BSC receives the MODE MODIFY ACK/NACK message from BTS and the CHANNEL MODE MODIFY message from MS

BSSAP ASSIGNMENT FAILURE message is sent to MSC when zxgT3 timer expires





50 5.0 s

51 5.1 s

120 12.0 s

Default value: 100

30. zxgT14 (100 ms)

Description: From the time when Ass/Ho Com is sent by destination instance to the time when Ass/Ho Com Ack is received.


Default value: 60

31. zxgT15: the usable time waiting for resources by the destination instance when disconnecting forcefully

Description: The usable time waiting for resources by the destination instance when disconnecting forcefully

Timer start conditions: when a destination instance needs to be disconnected, a PREEMPT APPLY message is sent to the disconnected object

Timer stop conditions: when a destination instance receives the response RESOURCE AVAILABLE message for the disconnected object indicating resource availability





60 6.0 s

61 6.1 s

120 12.0 s



Note: T15 > T3109 (10) + T3111 (0.1)

Default value: 60

32. zxgT16: the waiting time for oriented reattempt

Description: The waiting time for oriented reattempt





20 2 s

21 2.1 s

60 6 s


Default value: 20

33. rmsTqho: handover queue period

Description: Maxmium allowable queue time for handover attempt, calculated from the handover request


See Table 36 for value range of rmsTqho.

TA B L E 36 VA L U E RA N GE O F R M STQ H O


1 0.1 s

2 0.2 s

150 15 s


Default value: 60

34. zxgmT7: external handover protection time

Description: External handover protection time. BSS will receive the HO REJECT message from MSC after requesting for external handover. BSS must wait for (zxgmT7) time before it can receive other commands related to handover request. zxgmT7 < T7.


See Table 37 for value range of zxgmT7.



TA B L E 37 VA L U E R A N G E O F Z X G MT7


1 0.1 s

2 0.2 s

65535 6553.5 s

Default value: 100

35. zxgmT11 (100 ms)

Description: A clock is adopted when flow control is performed due to cell overload. This clock is together with zxgmT12 timer to modify the ACCESS CONTROL parameter configured in the cell, and notify this in system information to MS, therefore to achieve flow control. The value of the clock must be less than zxgmT12 timer.

Value range: 50200

Default value: 100

36. zxgmT12 (100 ms)

Description: A clock is adopted when flow control is performed due to cell overload. This clock is together with the zxgmT11 timer to modify the ACCESS CONTROL parameter configured in the cell, and notify this in the system information to MS, therefore to achieve flow control. The value of the clock must be greater than zxgmT11 timer. The process of the two clocks controlling their cell traffic: the system degrades the traffic level and starts the zxgmT11 and zxgmT12 timer after the network receives an overload message for the first time. The OVERLOAD message occurring during the zxgmT11 timer will be ignored. The flow will be decreased one more level and the zxgmT11 and zxgmT12 timer will be restarted if the OVERLOAD message is received between zxgmT11 and zxgmT12 timer. The flow level will be increased, and the zxgmT12 timer will be restarted if the zxgmT12 timer still does not receive the OVERLOAD message after the zxgmT12 timer expires. Figure 2 shows the illustration for the two clocks that control cell flow



F I G U R E 2 IL L U S T R A T I O N F O R TW O CL O C K S T O CO N T R O L CE L L FL O W

BTS BSC

overload

overload

overload

zxgmT11

zxgmT12


Default value: 150

37. Tmicro: the delay timer for micro-micro handover

Description: A delay time length value is necessary (the timer value) in the micro-micro handover control. Related timer will be started when a call enters a micro cell. The neighboring micro cell in the same layer can be used as an alternative cell only when the timer expires. In this way, the fast moving mobiles staying in the micro cell layer can be avoided.


See Table 38 for value range of Tmiirco.

TA B L E 38 VA L U E R A N G E O F TM I R C O


0 0 s

1 0.1 s

65535 6553.5 s

Default value: 100

The setting of this parameter is related to standard to measure average size of the micro cell and moving speed of a cell phone

38. T3101: instantly assign a period

Description: T3101 supervises the instantly assigned process

Timer start conditions: T3101 timer starts when BSC sends IMMEDIATE ASSIGNMENT COMMAND message



Timer suspend conditions: the T3101 timer stops when MS receives ESTABLISH INDICATION message

BSC will send CHANNEL RELEASE message to BTS when the T3101 timer expires



TA B L E 39 VA L U E RA N GE O F T3101


10 1 s

11 1.1 s

12 1.2 s

50 5 s


Default value: 30

39. T3103: source cell handover period

Description: T3101 timer supervises internal handover process of BSC

Timer start conditions: the T3101 timer starts when BSC sends the HANDOVER COMMAND message to MS

The T3101 expires when BSC receives the HANDOVER COMPLETE message on a new channel or the HANDOVER FAILURE message on an old channel from MS

Timeout action: CLEAR REQUEST message will be sent to MSC when the timer T3103 expires, and a new channel is released





35 3.5 s

36 3.6 s

37 3.7 s

100 10 s


Note: T3103 < T10 when setting this timer

Default value: 60



40. T3107: assigned period

Description: T3107 is to supervise assignment period and internal handover of a cell (< T10)

Timer start conditions: the T3107 timer is started when BSC sends the RIL3_RR ASSIGNMENT COMMAND message to MS

Timer stop conditions: the T3107 timer expires when BSC receives the RIL3_RR ASSIGNMENT COMPLETE message or the RIL3_RR ASSIGNMENT FAILURE message

The old and new channels for the assignment procedure will be released when the T3107 timer expires. Corresponding MS connection will be cleared, and a BSSAP ASSIGNMENT FAILURE message will be sent to MSC. CLEAR REQUEST message will be sent to MSC for intra-cell handover procedure.





35 3.5 s

36 3.6 s

37 3.7 s

100 10 s


T3107 < T10 when setting this timer

Default value: 60

41. T3109: channel release period

Description: T3109 timer supervises channel release process

Timer start conditions: the T3109 timer is started when BSC sends the RIL3_RR CHANNEL REALEASE message to MS

The T3109 timer expires when BSC receives the RELEASE INDICATION message from BTS (when BTS receives DISC frame from MS)

BSC will send the RF CHANNEL RELEASE message to BTS when the T3109 timer expires







80 8 s

81 8.1 s

82 8.2 s

150 15 s


Default value: 120

42. T3111: channel deactivation delay

Description: Set a protection timer T3111 after UM interface wireless link layer is released, to ensure disconnection of the wireless link layer. Release the wireless channel and deactivate it after the T3111 timer overflows.

Timer start conditions: the T3111 timer starts when BSC receives the RELEASE INDICATION message.

RF CHANNEL RELEASE message is sent to BTS when the T3111 timer expires





1 0.1

2 0.2

5 0.5 s


Default value: 1

43. Tbsic: BSIC decode period

Description: The parameter Tbsic defines a period, that is, calculated from call establishment or handover complete (inter-cell or intra-cell), C/I evaluation is considered irresponsible during this period, thus, it is not allowed to handover to a special TRX. During this period, MS can decode BSICs that interferes with (neighboring) cells before handover policy takes place.


See Table 44 for value rang of Tbsic.



TA B L E 44 VA L U E R A N G E O F TB S I C

Value Time Length

5 0.5 s

10 1.0 s

640 64.0 s

Default value: 50

44.AisT1 (100 ms)

Description: AppAssignReq-AppAssignCom the Assigning status protection timer. It is in the Assigning status before sending the App_Ass_Req message and receiving the App_Ass_Commessage.


Default value: 100

45. AisT4 (100 ms)

Description: AppRadioApp-AppRadioAvail (external hand in), RadioApplying status protection timer. It is in the RadioApplying status after receiving the message A_Ho_Req and before receiving the APP_RADIO_AVAIL message.


Default value: 100

46.AisT12 (100 ms)

Description: The Serving status protection timer. It is in Serving status after CR is sent and CC is received and before any further message is received; or after the App Ass Com message is received and before the call is cleared; or after the App Ho Com message is received at the handover from external and before the call is cleared.


Default value: 200

47. AisT8 (100 ms)

Description: AisT8 is the OutGoHoing status protection time that has received the HoCmd (sending the AppHOCmd to Rms)- ClearCmd. It is in the OutGoHoing status after receiving the A_Ho_Cmd to start the external handover and before the A_Clear_Cmd is received once the handover is successful.


Default value: 80

48. RMST3121 (100 ms)

Description: Protection time after sending inter-system to utran handover command (UM) to UE (on Pn)


Default value: 100



49. T3 (100 ms)

Description: Protection time after number 7 breaks off suddenly


Default value: 100

50. BCRT (100 ms)

Description: Regular timer for system message broadcast

Value range: 6000 ~ 2864000

Default value: 18000

51. BCPT (100 ms)

Description: Protection timer waiting for FUC response to system message broadcast


Default value: 50

GPRS Maximum Retrying Times Parameters1. BVCBlkMax

Description: BSSGP layer parameters - if PTP BVC must be blocked due to OAM intervention or equipment faults (disable blocking/unblocking signaling BVC), BSS will first set BVC status as Blocked and discard uplink service data. To notify SGSN to stop sending downlink data, BSS will initiate BVC blocking procedure. It will repeat BVC blocking procedure after sending BVC block message to SGSN and if it fails to receive BVC BLOCK ACKNOWLEDGE message from SGSN in BSSGPT1. BVC blocking can be repeated for a maximum of N times. BSC will stop BVC blocking and notify OMS of such if for N times there is no answer. N depends on maximum reattempts of BVC BLOCK.

Value range: 3 ~ 10

Default value: 3

2. BVCUBlkMax

Description: BSSGP layer parameters - if the PTP BVC must be unblocked due to the OAM intervention or recovery of the equipment fault (disable blocking/unblocking the signaling BVC), BSS will first set the BVC status as Unblocked. To notify SGSN to start sending the downlink data, BSS will also initiate the BVC unblocking procedure. It will repeat the BVC unblocking procedure after sending the BVC UNBLOCK message to SGSN and if it fails to receive the BVC UNBLOCK ACKNOWLEDGE message from SGSN in BSSGPT1. BVC unblocking can be repeated for a maximum of N times. BSC will stop BVC unblocking and notify OMS of such if for N times there is no answer. N depends on maximum reattempts of BVC UNBLOCK.

Value range: 3 ~ 10

Default value: 3



3. BVCResetMax

Description: BSSGP layer parameters - to keep initial status consistent between two BVC sides, Reset BVC process must be initiated in following cases: 1) system faults that affects BVC function in BSS or SGSN (such as restart upon power-on); 2) lower layer network service entity failure (such as frame relay fault); 3) lower layer network service entity capability update (for example, frame relay capability changed from 0kbps to greater than 0kbps); 4) changing relationships between BVC and cell. For faults that affect NSE, Signaling BVC reset procedure is initiated; For faults that affect a single BVC, PTP BVC reset procedure is initiated. All PTP BVC reset under that NSE must be initiated after a signaling BVC reset is initiated. It will repeat BVC reset procedure after sending BVC RESET message to SGSN and if it fails to receive BVC RESET ACKNOWLEDGE message from SGSN in BSSGPT2. BVC RESET can be repeated for a maximum of N times. BSC will stop BVC RESET and notify OMS of such if for N times there is no answer. N depends on maximum reattempts of BVC Reset.


Default value: 3

4. NSBlkMax

Description: NS link layer parameters - maximum repetitions during BSC blocking. It will repeat blocking process when BSC sends the NS BLOCK message to SGSN and if NS BLOCK ACKNOWLEDGE message sent by the SGNS has not been received in a specified NS_T1 time. NS BLOCK message can be repeated for a maximum of N times. BSC will stop BLOCK procedure and notify OMS of such if for N times there is still no answer. N depends on maximum reattempts of NS BLOCK.

Value range: 0 ~ 10

Default value: 3

5. NSUnBlkMax

Description: NS link layer parameters - maximum repetitions during BSC unblocking. It will repeat UNBLOCK procedure after BSC sends the NS UNBLOCK message to SGSN and if it fails to receive the NS BLOCK ACKNOWLEDGE message from SGSN in the time specified by the timer NS_T1. The NS UNBLOCK message can be repeated for a maximum of N times. BSC will stop the UNBLOCK procedure and notify OMS of such if for N times there is still no answer. N depends on maximum reattempts of NS UNBLOCK.

Value range: 010

Default value: 3

6. NSAliveMax

Description: Maximum repetitions of BSC Alive procedure. It will repeat BSC Alive procedure after BSC sends NS Alive message to SGSN and if it fails to receive NS Alive ACKNOWLEDGE message from SGSN in the time specified by timer NS_T4. NS Alive message can be repeated for a maximum of N times. BSC will stop BSC Alive procedure and notify OMS of such if for N times there is still no answer. N depends on maximum reattempts of NS Alive.



Value range: 0 ~ 20

Default value: 10

7. SuspendMax

Description: BSSGP layer parameters - MS will first send a SUSPEND message to BSS over SDCCH when Class B GPRS MS is about to initiate a voice service. BSS initiates Suspend procedure to SGSN to notify SGSN to stop sending PS paging and downlink packet data after BSS receives the message. It will repeat Suspend procedure after sending SUSPEND message to SGSN and if it fails to receive SUSPEND ACK/NACK message from SGSN in BSSGPT3. It will repeat Suspend procedure for a maximum of N times. BSC will stop Suspend and notify OMS of such if for N times there is no answer. N depends on maximum Suspend reattempts.


Default value: 3

8. ResumeMax

Description: BSSGP layer parameters - when GPRS-attached MS leaves a special mode, BSS can adopt one of the following strategies: 1) Notify MS of carrying out route area upgrade and 2) notify SGSN of recovering the GPRS service. In case of Routing Area Update, MS and SGSN will directly negotiate GMM status. With the Resume method (usually for MS in the packet transmission status), BSS will initiate the RESUME process to SGSN to notify SGSN to start the normal packet downlink transmission action. It will repeat Resume procedure after sending the RESUME message to SGSN and if it fails to receive the RESUME ACK/NACK message from SGSN in BSSGPT4. It will repeat Resume procedure for a maximum of N times. BSC will stop the Resume procedure and notify OMS of such if for N times there is no answer. N depends on maximum Resume reattempts.


Default value: 3

9. UpdateMax

Description: BSSGP layer parameters - when MS is establishing the uplink/downlink TBF, to assign the appropriate packet channel to the MSs that have different access capabilities, BSS needs to know the radio access capability of that MS. BSS can obtain that information from SGSN by the Radio Access Capabilities Update procedure if it does not have that information yet. It will repeat the procedure after sending the RADIO ACCESS CAPABILITIES UPDATE message to SGSN and if it fails to receive the RADIO ACCESS CAPABILITIES UPDATE ACK/NACK message from SGSN in BSSGPT5. The Radio Access Capabilities Update procedure can be repeated for a maximum of N times. For N times if there is still no answer, then BSC will stop the Radio Access Capabilities Update procedure and notify OMS of such. N depends on maxmium Update reattempts.


Default value: 3



GPRS Timer Parameters1. BSSGP T1 BVC block/unblock reattempt time

Description: Timer that monitors BSSGP block/unblock procedure. Parameter used by global process in central module MP. BSS initiates BVC block/unblock procedure if a point-to-point BVC block/unblock is required due to OAM intervention or device faults and repeats the procedure if SGSN does not return BVC BLOCK/UNBLOCK ACK/NACK message. Interval between them is BssgpT1.

Value range: 10 ~ 300 (100ms)

Default value: 30

2. BSSGPT2 BVC Reset reattempt time

Description: Timer that monitors reset procedure of BSSGP. Parameter used by global process in central module MP. BSS initiates BVC RESET process if BVC (including PTP BVC and signaling BVC) must be reset and repeats the procedure if SGSN does not return BVC RESET ACK/NACK message. Interval between them is BssgpT2.


Default value: 30

3. BSSGPT3 Suspend reattempt time

Description: Timer that monitors Suspend procedure of BSSGP. Parameter used by service process in peripheral module MP. Class B MS notifies network to Suspend packet service when it is ready to perform a voice service. BSS initiates Suspend SGSN procedure after receiving SUSPEND message from MS and repeats the procedure if SGSN does not return SUSPEND ACK/NACK message. Interval between them is BssgpT3.


Default value: 30

4. BSSGPT4 Resume reattempt time

Description: Timer that monitors Resume procedure of BSSGP. Parameter used by service process in peripheral module MP. BSS initiates Resume procedure to SGSN when GPRS-attached MS is not in dedicated mode and BSS uses Notify SGSN to resume GPRS service policy. BSS repeats the procedure if SGSN does not return RESUME ACK/NACK message. Interval between them is BssgpT4.


Default value: 30

5. BSSGPT5 Radio Access Capabilities Update reattempt time

Description: Timer that monitors RA_CAPABILITY procedure of BSSGP. Parameter used by service process in peripheral module MP. It will repeat Radio Access Capability Update procedure after BSS initiates RA_CAPABILITY procedure to SGSN and if SGSN does not return the RA_CAPABILITY UPDATE ACK/NACK message. The interval between them is BssgpT5.




Default value: 30

6. NS T1

Description: Timer that monitors the block/unblock procedure at the NS layer

Value range: 1 ~ 120 s

Default value: 60

7. NS T2

Description: Timer that monitors the reset procedure at the NS layer


Default value: 60

8. NS T3

Description: The test period of NS-VC


Default value: 30

9. NS T4

Description: Timer that monitors the alive procedure of the NSVC

Value range: 3 s

Default value: 3

10. NS T5 (temporarily not used)

Description: Maximum attempt period of Reset

Value range: 3 min

Default value: 180 s.

11. T3169

Description: BRPs timer at RLC/MAC layer. During the packet uplink transmission, if the timer N3101 or N3103 expires, BSS will start the timer T3169. TFI and USF resources are released for use by the network when T3169 expires.

Timer start conditions: the T3169 timer starts when the counter N3101 = N3101_MAX or the counter N3103 = N3103_MAX


Timeout action: Release USF and TFI resources

Value range: 0 ~ 0xFFFF (10ms)

Default value: 500 (5 s)

12. T3191

Description: BRPs timer at RLC/MAC layer. During the packet downlink transmission, if the BSN of the RLC data block to be transmitted is at its maximum load (that is, the final downlink data block), the network will send RLC data block whose Final Block Identifier (FBI) field is 1 and which includes effective RRBP field to initialize the release of the



downlink TBF. At this time the network starts the T3191 timer. For RLC data block in which each received FBI is 1 and containing effective RRBP domain, MS must send the Package Downlink Confirmation/Non-confirmation message whose FAI domain is 1 through the uplink block specified by the RRBP domain. T3191 is terminated and required RLC data block is re-transmitted if the network receives the PACKET DOWNLINK ACK/NACK message before the T3191 timer expires and is required to re-transmit it. T3191 timer is terminated and enabled T3193 timer if re-transmission is not necessary. The network releases TBF when T3193 timer expires. The network also releases TBF when T3191 expires; 2) In unacknowledged mode, MS must send the PACKET CONTROL ACKNOWLEDGE message in the uplink block specified by the RRBP field. T3191 is terminated and T3193 enabled if the network receives the PACKET CONTROL ACKNOWLEDGE message before T3191 expires. The network also releases TBF when T3191 expires.


Default value: 500 (5 s)

13. T3193

Description: BRPs timer at the RLC/MAC layer is used for protection at the release of TBF during the packet downlink transmission. For details, see description of the T3191 timer.

Timer start conditions: the timer T3193 is started when the PACKET DOWNLINK ACK/NACK message or the PACKET CONTROL ACKNOWLEDGE message is received

Timer stop conditions: when the network has established a new downlink TBF

Timeout action: Release TFI resources

Value range: 00xFFFF (10ms)

Default value: 51

Value of this parameter needs to be greater than T3192 timer to ensure uniqueness of TFI of MS at one moment

14. T3195

Description: BRPs timer at the RLC/MAC layer. Protection time of TBF when the radio link failure or the cell change leads to MS failure to respond. During the packet downlink transmission, if the timer N3105 expires, BSS will start the T3195 timer. The TFI resource is available again for use by the network when T3195 timer expires.

Timer start conditions: the timer T3195 starts when the counter N3105 = N3105_MAX


Timeout action: Release TFI resources


Default value: 500 (5 s).

15. ccmT1



Description: Protection timer for change of the FUC channel type



16. ccmT2

Description: Protection timer for T-network connection



17. ccmT3

Description: Protection timer for LSP movement



Other GPRS Property Parameters1. CELL Threshold of the Bssgp Flow Control (CelFcThs)

Description: This parameter is the trigger threshold for BVC flow control. The BVC flow control is performed on the Gb interface between SGSN and BSS and in the downlink only. In practice, BSS provides the control parameter and SGSN executes it to avoid the situation of the LLC data being discarded due to timeout caused by the busy packet channel in BVC (excess LLS frames buffered) or that the new downlink LLC data is discarded due to limited memory resources (LLC frame buffer overflow). The BSSGP process on the BSS side periodically (long or short) counts the current leakage ratio of BVC. BVC flow control procedure is initiated unconditionally. SGSN confirmation is also necessary if the long count timer overflows. BVC flow control is initiated and it also needs the SGSN confirmation if the short count timer overflows and the difference between the two consecutive leakage ratios is more than CellFcThs.

Value range: 1 ~ 100 (%)

Default value: 80

2. MS Threshold of the Bssgp Flow Control (MsFcThs)

Description: This parameter is the trigger threshold for MS flow control. MS flow control is performed on the Gb interface between SGSN and BSS and in the downlink only. In practice, BSS provides the control parameter and SGSN executes it to avoid the situation of the LLC data from being discarded due to timeout caused by the busy packet channel in MS (excessive LLS frames buffered) and that the new downlink LLC data is discarded due to limited memory resources (LLC frame buffer overflow). The BSSGP process at the BSS side periodically (long or short) measures the current leakage ratio of MS. MS Flow Control process is initiated unconditionally if the long measurement timer overflows. SGSN must acknowledge it if the difference between the two consecutive leakage ratios is more than MsFcThs. MS Flow Control process is initiated and it also needs acknowledgement of SGSN if the short measurement timer overflows



and the difference between the two consecutive leakage ratios is more than MsFcThs.

Value range: 1 ~ 100 (%)

Default value: 80

3. CELL Trigger Period of the Bssgp Flow Control (CelFcPer)

Description: This parameter is the BVC leakage ratio measurement period in the BVC Flow Control process, that is, BVC long measurement period. To provide reference to the BVC flow control at the SGSN side, the BSSGP process at the BSS side periodically measures the current BVC leakage ratio. BVC flow control procedure is initiated unconditionally when the long measurement timer overflows. It needs to be confirmed by SGSN if the difference of the leakage ratios between the two times exceeds CellFcThs. BVC flow control procedure is also initiated and it also needs to be confirmed by SGSN if the short measurement timer overflows, and the difference of the leakage ratio between the two times exceeds CellFcThs. In the OMCR (V2) system, BVC short measurement period = BVC long measurement period / 3.


Default value: 3000

4. MS Trigger Period of the Bssgp Flow Control (MsFcPer)

Description: This parameter is MS leakage ratio measurement period in the MS Flow Control process, that is, MS long measurement period. For reference of flow control at the SGSN side, the BSSGP process at the BSS side periodically measures the current leakage ratio of each MS. MS Flow Control process is initialized unconditionally when the long measurement timer overflows. SGSN must acknowledge it if the difference between the two leakage ratios exceeds MsFcThs. MS Flow Control process is initialized and it also needs acknowledgement from the SGSN when the short measurement timer overflows, and the difference between the two leakage ratios exceeds MsFcThs. In

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