zte umts access contro

8/10/2019 ZTE Umts Access Contro

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UMTS Access Control

ZTE University


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Content

UMTS System Information Broadcasting

UMTS Paging

UMTS Random Access

UMTS RRC Connection Setup and ReleaseAccess Failed Case


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System Broadcasting

The system information broadcasted over the BCHchannel mainly includes the following contents: Public Land Mobile Network (PLMN) ID, location area (LA), route

area (RA)

Information on the timers and counters related to the RadioResource Control (RRC) connections

Configuration information of the UTRAN registration area (URA)

Cell selection and reselection parameters

Parameters for configuring the common channels, such as FACH,PCH, and RACH

Information on the uplink interference related to the auxiliary powercontrol

UE measurement control message over the idle or commonchannel

Parameters of the adjacent cell


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System information

Master information block (MIB) Schedule block (SB)

System information block (SIB)

ZTE UTRAN supports SIB1, SIB2, SIB3, SIB5, SIB7,

SIB11, SIB11bis, SIB18.MIB

SB1/SB2

SIB1 SIB2 SIB3/4 SIB5/6 SIB7 SIB11/12

SIB15 SIB18


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Level 1 Information blocks scheduled by MIB: SB, SIB1, SIB2, SIB3,SIB5, SIB7

Level 2 Information blocks scheduled by SB1: SIB11, SIB18

Scheduling levels of the SIBS

Broadcast interval of level 2 >= broadcast interval of level 1


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SIB Block

SIB Content Controlled by

SIB1 the CN information, UE behavior

related timers and counters

RNC

SIB2 URA ID of a cell RNC

SIB3/4 cell selection and cell reselection RNC

SIB5/6 common transport channels andcommon physical channels

RNC

SIB7 parameters needed in the calculation

of the PRACH preamble power

RNC/NodeB

SIB11/12 cell measurement control information. RNC

SIB 11bis Compensation of SIB 11 RNC

SIB 15 Information for location service RNC

SIB 18 the PLMN tag of neighbor cell RNC


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System broadcasting

SRNC

System information broadcast

UE NodeB

system information broadcast

scheduler

DRNC

Paging PAGING TYPE1

SYSTEM INFORMATION CHANGE INDICATIONRRC RRC

Condition informing UE of CELL_FACH that

system information changed

Condition informing UE of idle, CELL_PCHURA_PCH

that system information changed

SYSTEM INFORMATION UPDATE REQUEST

SYSTEM INFORMATION UPDATE RESPONSE


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SIB1

SIB1 mainly contains the CN information, UE behaviorrelated timers and counters. T300

N300

T312Idle

N312Idle T302

N302

T304

N304

T305

T307

T308

N308

T309

T312 Connected

N312Connected

T313

N313

N315 T314

T315

T316

T317

T3212Cs

ATTIndCs

NMOPs

Kcs

Kps


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SIB1


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SIB2

SIB2 specifies the URA ID of a cell. With SIB2, the UE inthe URA_PCH state can update the URA.

Parameter Name Parameter Description

URANum Number of UTRAN registration areas

URA[4] ID of a UTRAN registration area


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SIB3/SIB4

Parameters in SIB3 and SIB4 are related to thecell selection and cell reselection. SIB3 contains

information required by the UE in Idle mode. SIB4

contains information required by the UE in

Connected. If SIB4 is not sent, the UE inConnected mode can also receive SIB3.


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SIB3/SIB4


Cid Cell IDQualMeas Measurement Quantity for Cell Selection and Reselection

SIntraSearchPre Sintrasearch Configuration Tag

SIntraSearch The threshold that triggers the intra-frequency measurement in the cell reselection

process

SInterSearchPre Sintersearch Configuration Tag

SInterSearch The threshold that triggers the inter-frequency measurement in the cell reselection

process

SSearchHCS Pre SsearchHCS Configuration Tag

SSearchHCS The threshold that triggers the measurement in the HCS cell reselection process

SSearchRat The threshold that triggers the inter-system measurement in the cell reselection

process

SHCSRatPre SHCS,RAT Configuration Tag

SHCSRat The threshold that triggers the inter-system measurement in the HCS cell reselection

process

SLimitRat The threshold that triggers the inter-system cell measurement in the cell reselectionprocess

QQualMin The minimum cell quality requirement level

QRxLevMin The minimum cell receive electrical level threshold

DltaQRxLevMinPr DeltaQrxlevmin Configuration Tag

DltaQRxLevMin The minimum cell receive electrical level threshold increment


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SIB5/SIB6


TfsIndex

Transmission format index. It is used to indicate the attributes of atransport channel, including channel type, transport format number,

number of transport blocks, transport block size, transmission time

interval, coding rate, rate matching attribute.

ChType Channel Type

TfNum Transport Format Number

TrBlkNum Number of Transport Blocks

RlcSize Transport Block Size

TTI Transmission Time Interval

CodingRate Coding Rate

RateMatchAttr Rate Matching Attribute

CRCSize CRC Size

NiNumPerFrame Number of NI per Frame

CPCId Common Physical Channel IDMichPwr Power(dB)

MichChCode Channelisation Code No.


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SIB5/SIB6


SttdInd STTD IndicatorSttdInd AICH STTD Indicator

ChCode AICH Channelisation Code No.

AichTranTime AICH Transmission Timing

AichPwr AICH Power

MplexPos Multiplexing Position

PCHInd Indicator for SCCPCH Carrying PCH

DlScraCode SCPICH Scrambling Code

ChCode SCPICH Channelisation Code No

ChCode PICH Channelisation Code No.

SttdInd PICH STTD Indicator

CPCId Pich Common Physical Channel ID

PichPwr PICH Power

SttdInd PCCPCH STTD IndicatorSignature Available Signature

AvailSubChanNum PRACH Available Subchannel Number

AvailableSF PRACH Available SF


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SIB5/SIB6


PreamScraCode PRACH Preamble Scrambling CodePcpichPwr P-CPICH Power(dBm)

PunctLimit Puncturing Limit

SignalFach FACH Usage

TfcsIndexIndex of a transmission format combination set. It must be configured for

S-CCPCH or PRACH.

CtfcNum

Number of transmission format combination sets. It must be configured

for S-CCPCH or PRACH.

Ctfc

ID of a transmission format combination. It must be configured for S-

CCPCH or PRACH.

SCCPCHUsage SCCPCH Usage

SccpchOffset SCCPCH Frame Timing Offset

SttdInd SCCPCH STTD Indicator

DlScraCode S-CCPCH Scrambling CodeDlChCodeNo S-CCPCH Channelisation Code No.

SlotFmt S-CCPCH Slot Format

SttdInd P-CPICH STTD Indicator


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SIB7

SIB7 is the system information block that is updatedperiodically. The timer of SIB7 is calculated as follows:

Expiration timer = MAX(32,SIB_REP * ExpirationTimeFactor)

SIB_REP is the transmission interval of SIB7 and is obtained at the

time of broadcast scheduling; ExpirationTimeFactor is the timeout

factor of SIB7 and is set to 2 invariably.

SIB7 contains the parameters needed in the calculation of

the PRACH preamble power.


DynPstLevelInit Initial Dynamic Persistence Level


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SIB11/SIB12

SIB11/SIB12 is used to configure cellmeasurement control information. SIB11 specifies

the measurement control information required by

the UE in Idle mode. SIB12 specifies the

measurement control information required by theUE in FACH state. If SIB12 is not broadcasted, the

UE in connected mode can also use the

configuration information specified by SIB11.


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SIB18

SIB18 specifies the PLMN tag that must be considered bythe UE in Idle or connected mode.


NMCC Mobile Country Code of Neighboring CellNMNC Mobile Network Code of Neighboring Cell


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Waiting Time After UE Sending RRC

CONNECTION SETUP REQUEST MessageParameter Name T300

Description The timer is started after the UE sends the RRC

CONNECTION REQUEST message. The T300timer is

stopped when the message RRC CONNECTION SETUP is

received, when the timer expires and the retransmit event

count is smaller than N300,the UE retransmits the RRC

CONNECTION SETUP REQUEST message.Range and Step 1002004006008001000120014001600

180020003000400060008000ms

Default Value 2000ms

Configuration

Path

View->Configuration Management->RNC NE->RNC Radio

Resource Management->Advanced Parameter Manage ->UETimers and Constants Infomation ->Waiting Time After UE

Sending RRC CONNECTION SETUP REQUEST

Message(T300)(ms)


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Maximum Number of Retransmissions of the

RRC CONNECTION REQUEST MessageParameter Name N300

Description If theT300timer expires and the retransmit event count is

equal to or larger than N300but theRRC CONNECTION

SETUP message has not been received, the UE enters the

Idle mode.

Range and Step 07

Default Value 3

Configuration

Path


Resource Management->Advanced Parameter Manage ->UE

Timers and Constants Infomation ->Maximum Number of

Retransmissions of the RRC CONNECTION REQUEST

Message (N300)


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Waiting Time for Receiving "In Sync" from L1

in Idle ModeParameter Name T312Idle

Description The timer is started when the UE starts to establish the

dedicated channel. When the UE finds the number of

synchronization indications received from layer 1 is equal to

N312Idle, the T312timer is stopped.If the timer expires, the

physical channel setup fails.

Range and Step 115s

Default Value 2s

Configuration

Path



Timers and Constants Infomation ->Waiting Time for

Receiving "In Sync" from L1 in Idle Mode (T312 in IdleMode)(s)


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Maximum Number of "In Sync" Received from

L1 in Idle ModeParameter Name N312Idle

Description The smaller the parameter, it is easier to judge whether the

synchronization finishes, but the chance of fake

synchronization also increases; the larger the parameter, the

higher the reliability, but it is more time consuming.

Range and Step 011

Default Value 10

Configuration

Path



Timers and Constants Infomation ->Maximum Number of "In

Sync" Received from L1 in Idle Mode (N312 in Idle Mode)


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Waiting Time After UE Sending CELL/URA

UPDATE MessageParameter Name T302

Description The counter is started when the UE sends the CELL UPDATE

or URA UPDATE message; the counter is stopped when the

UE receives the CELL UPDATE CONFIRM or URA UPDATE

CONFIRM message. If the counter T302expires but the

number of retransmitted messages is smaller than N302,the

UE retransmits the CELL UPDATE or URA UPDATE message.Range and Step 1002004006008001000120014001600

180020003000400060008000ms


Configuration

Path



Sending CELL/URA UPDATE Message(T302)(ms)


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CELL/URA UPDATE MessageParameter Name N302

Description When the T302counter expires and the number of the CELL

UPDATE or URA UPDATE messages sent by the UE is larger

than or equal to N302,theUE enters the Idle mode.

Range and Step 07

Default Value 2

Configuration

Path




Retransmissions of the CELL/URA UPDATE Message (N302)


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Waiting Time After UE Sending UE

CAPABILITY INFORMATION MessageParameter Name T304

Description When the UE sends the UE CAPABILITY INFORMATION

message, the timer is started; when the UE receives the UE

CAPABILITY INFORMATION Confirmed message, the timer is

stopped. When the T304timer expires and the number of the

CAPABILITY INFORMATION messages sent by the UE is

smaller than N304, the UE retransmits the UE CAPABILITYINFORMATION message.

Range and Step 10020040010002000ms


Configuration

Path



Sending UE CAPABILITY INFORMATION Message(T304)

(ms)


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UE CAPABILITY INFORMATION MessageParameter Name N304

Description When the T304counter expires and the retransmit event

count is equal to or larger than N304, theUE starts the CELL

UPDATE process.

Range and Step 07

Default Value 2

Configuration

Path




Retransmissions of the UE CAPABILITY INFORMATION

Message (N304)


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Period of Cell/URA Update When UE is in

CELL_FACH/CELL_PCH/ URA_PCH StateParameter Name T305

Description The T305 timer is started when the UE enters the

CELL_FACH, or CELL_PCH/URA_PCH state. When the UE

receives the CELL UPDATE CONFIRM or URA UPDATE

CONFIRM message, the T305timer is stopped. When the

T305timer expires and the UE detects its own serving cell,

the UE sends the CELL UPDATE message; when the T305timer expires and the UE is not in the serving cell, it starts the

T307timer.

Range and Step no update5103060120360720min

Default Value 5min

ConfigurationPath

View->Configuration Management->RNC NE->RNC RadioResource Management->Advanced Parameter Manage ->UE

Timers and Constants Infomation -> Period of Cell/URA

Update When UE is in CELL_FACH/CELL_PCH/ URA_PCH

State(T305)(min)


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Waiting Time for Cell Reselection After UE is

out of ServiceParameter Name T307

Description The parameter specifies the waiting time between the time

when the UE leaves the serving cell and the time when the UE

reselects the cell. The smaller the parameter, more quickly the

UE can reenter the network, but this may increase the load of

the UE and the system.

Range and Step 5101520304050s

Default Value 5s

Configuration

Path



Timers and Constants Infomation ->Waiting Time for Cell

Reselection After UE is out of Service(T307)(s)


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Waiting Time After Sending RRC CONNECTION

RELEASE COMPLETE Message in CELL_DCH State

Parameter Name T308

Description The T308timer is started after the UE sends the RRC

CONNECTION RELEASE COMPLETE message. When the

T308timer expires and the number of the RRC

CONNECTION RELEASE COMPLETE messages sent by the

UE is smaller than N308, the UE retransmits the RRC

CONNECTION RELEASE COMPLETE message.Range and Step 4080160320ms

Default Value 80ms

Configuration

Path



Timers and Constants Infomation ->Waiting Time AfterSending RRC CONNECTION RELEASE COMPLETE

Message in CELL_DCH State(T308) (ms)


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Waiting Time After Requesting Connection

Establishment in Other System(eg. GSM)Parameter Name T309

Description When the UE receives the CELL CHANGE ORDER FROM

UTRAN message, the T309timer is started; when the UE in

the new cell successfully receives the response to the

connection setup request, the T309timer is stopped. If the

T309 timer expires, the UE returns to the original UTRAN.

Range and Step 18s

Default Value 8s

Configuration

Path



Timers and Constants Infomation ->Waiting Time After

Requesting Connection Establishment in Other System(eg.GSM) (T309)(s)


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Waiting Time for Receiving In Sync from L1

In Connected ModeParameter Name T312Connected

Description The timer is started when the UE starts to establish the

dedicated channel. When the UE finds the number of

synchronization indications received from layer 1 is equal to

N312, T312is stopped.If the T312 timer expires, the physical

channel setup fails.

Range and Step 115s

Default Value 1s

Configuration

Path




Receiving In Sync from L1 In Connected Mode(T312 inConnected Mode)(s)


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Maximum Number of "In Sync" Received from

L1 in Connected ModeParameter Name N312Connected





Range and Step 124102050100200400600800

1000

Default Value 1

Configuration

Path



Timers and Constants Infomation ->Maximum Number of "In

Sync" Received from L1 in Connected Mode (N312 inConnected Mode)


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Waiting Time After DPCCH Established in

CELL_DCH State Losing SychronizationParameter Name T313

Description When the number of synchronization loss indications received

by the UE in the DCH state from layer 1 reaches the value of

N313, the UE starts T313. When the UE receives

synchronization indications from layer 1 for N315times, it

stops the T313timer.When the T313timer expires, the radio

links involved in the lost synchronization fail.Range and Step 015s

Default Value 3s

Configuration

Path



Timers and Constants Infomation ->Waiting Time AfterDPCCH Established in CELL_DCH State Losing

Sychronization (T313)(s)

M i N b f S i "O f


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Maximum Number of Successive "Out of

Sync" Received from L1Parameter Name N313





Range and Step 124102050100200

Default Value 50

Configuration

Path


Resource Management->Advanced Parameter Manage -

>INFORMATION ON THE CONSTANTS OF THE UE

COUNTER AND TIMER ->Maximum Number of Successive

"Out of Sync" Received from L1(N313)

M i N b f S i "I S "


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Maximum Number of Successive "In Sync"

Received from L1 During T313 is ActivatedParameter Name N315





Range and Step 124102050100200400600800

1000

Default Value 1

Configuration

Path




Successive "In Sync" Received from L1 During T313 isActivated ( N315)


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Waiting Time for Completion of Cell Update When Radio

Link Fails and Radio Bearer(s) Associated with T314 Exist

Parameter Name T314

Description When the criteria for radio link failure are fulfilled, T314is

started if radio bearer(s) that are associated with T314exist or

if only RRC connection exists only to the CS domain. When

the Cell Update procedure has been completed, T314 is

stopped.

Range and Step 02468121620s

Default Value 4s

Configuration

Path




Completion of Cell Upate When Radio Link Fails and RadioBearer(s) Associated with T314 Exist (T314)(s)


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Waiting Time for Completion of Cell Update When Radio

Link Fails and Radio Bearer(s) Associated with T315 Exist

Parameter Name T315

Description When the RB is set up, the system uses T314or T315for the

RB. When the radio link fails and the current RB uses T315,

the system starts T315. When the cell updating process

finishes, the system stops T315.

Range and Step 010306018060012001800s

Default Value 30s

Configuration

Path




Completion of Cell Upate When Radio Link Fails and Radio

Bearer(s) Associated with T315 Exist (T315)(s)


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Waiting Time for Cell Selection/Reselection After UE

is out of Service in CELL_PCH/URA_PCH State

Parameter Name T316

Description When the UE in the PCH state leaves the serving cell, the

system starts the T316timer; when the UE detects the serving

cell, the system stops theT316timer.When theT316timer

expires, if the UE is in the serving cell, it initiates the cell

updating; if theT316timer is not in the serving cell, it starts

the T317timer and switches to the FACH state. When the UEdetects the serving cell, it starts the cell updating.

Range and Step 01020304050Infinitys

Default Value 0s

Configuration

Path


Resource Management->Advanced Parameter Manage ->UETimers and Constants Infomation -> Waiting Time for Cell

Selection/Reselection After UE is out of Service in

CELL_PCH/URA_PCH State(T316)(s)

W iti Ti f C ll S l ti /R l ti


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Waiting Time for Cell Selection/Reselection

After UE is out of Service in CELL_FACH State

Parameter Name T317

Description When the T316timer expires, the system starts the T317

timer; when the UE in the FACH leaves the serving cell, the

system starts the T317timer. When the UE detects the

serving cell, it stops the T317timer.

Range and Step 010306018060012001800s

Default Value 0s

Configuration

Path



Timers and Constants Infomation ->Waiting Time for Cell

Selection/Reselection After UE is out of Service in

CELL_FACH State(T317)(s)


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Mobile Country Code

Parameter Name MCC

Description The parameter specifies the mobile country code.

Range and Step 0999

Default Value 460

Configuration

Path


Resource Management->CN NAS Configuration Information ->Mobile Country Code


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Mobile Network Code

Parameter Name MNC

Description The parameter specifies the mobile network code.

Range and Step 0999

Default Value

Configuration

Path


Resource Management->CN NAS Configuration Infomation->Mobile Network Code


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CN Domain Supported

Parameter Name CnDomain

Description The parameter specifies the supported CN domains.

Range and Step 0: CS Domain

1: PS Domain

2: CS+PS

Default Value 2: CS+PS

Configuration

Path


Resource Management->CN NAS Configuration Infomation -

>CN Domain Supported


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Timer for Periodic Location Update

Parameter Name T3212Cs

Description The parameter specifies the interval at which the location

information is reported. The smaller the parameter, it is easier

to judge the real location.

Range and Step 025.5hours Step0.1hour

Default Value 1 hour

Configuration

Path


Resource Management->Advanced Parameter Manage ->CN

System Infomation ->Timer for Periodic Location

Update(T3212)(hour)


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URA Number

Parameter Name URANum

Description The parameter specifies the number of URAs for the current

cell. The system supports up to 4 URAs.

Range and Step 14

Default Value N/A

ConfigurationPath View->Configuration Management->RNC NE->RNC RadioResource Management->UtranCell->UtranCell Global

Information ->URA Number


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URA Identity

Parameter Name URA4

Description The parameter specifies the No. of the URA to which the

current area belongs.


Default Value N/A


Information ->URA Identity


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Cell Identity

Parameter Name CId

Description The parameter specifies the ID of a cell and is used to

distinguish different cells.


Default Value N/A


Information ->Cell Identity


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Content

UMTS System Information Broadcasting UMTS Paging

UMTS Random Access



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Paging FlowSRNC CNUE

ConditionPAGING originated by CN

NodeB DRNC

ConditionPAGING originated by RNC

ConditionPAGING originated by RNC , on Iur interface

PAGING

PAGING TYPE 1

PAGING TYPE 2

ConditionUE in IDLEPCH

ConditionUE in DCHFACH

PAGING REQ

PAGING TYPE 1

PAGING TYPE 2

ConditionUE in IDLEPCH

ConditionUE in DCHFACH


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PAGING TYPE 1

When the UE is in the Idle, or URA_PCH state,the RNC receives the paging message from the

CN and then sends the paging message of

PAGING TYPE 1 over the PCH channel to the UE.

To improve the chance of receiving the pagingmessage by the UE, the RNC repeatedly sends

the paging message of PAGING TYPE 1 to the

UE.


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Page Indicator

The PCH channel has a corresponding PICH physical

channel. The page indicator (PI) is transmitted over the

PICH channel, with each PI corresponding to a group of

UEs. The following lists the formula for calculating the PI:

PI = DRX Index modNp

Where:

DRX Index = IMSI div 8192

Np= the number of PIs included in a PICH frame.


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Page Indicator

The UE judges whether the network is paging itself by

monitoring its own PI. Each PICH frame can contain the PI

of multiple UEs. The more the parameter Np, the larger the

transmit power of the PICH will be.

b1b0

288 bits for paging indication12 bits (transmission

off

One radio frame (10 ms)

b287 b288 b299

Number of PIs

in each frame

Number of repeated

bits in the PICH

Transmit power of the PICH in

comparison with that of the CPICH18 16 -7

36 8 -7

72 4 -5

144 2 -2


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Paging Occasion

For saving power, the UE in the Idle or PCH statemonitors the PICH channel in the Discontinuous

Reception (DRX) mode. In the DRX mode, the UE

monitors the PI once every DRX period. That is,

each UE has its own paging occasion (PO). TheUE monitors each PICH frame in the

corresponding SFN and finds its own PI in the

frame according to the calculated PI. Therefore,

the RNC fills in the PI in the message transmittedover the PICH channel according to the paging

occasion of the UE. DRX period = 2kframes


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Paging Occasion

Paging Occasion = {(IMSI div N) mod (DRX cycle length

div PBP)} * PBP + n * DRX cycle length + Frame Offset

Where:

N = number of SCCPCH channels carried over the PCH in a cell

DRX cycle length = 2kframe

PBP = 1

n = SFN

DRX Cycle

PI PI PI PI PI PI

0 1 i-1 i+1i Np-1

0 2K-1 4095

PO


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DRX cycle length coefficient

When the UE is in the Idle mode, the RNC calculates K in

the DRX period according to Kcs, Kps, and DRX Cycle

Length Coefficient in the paging message from the CN.

For paging messages from the CS domain, K = Min(Kcs,Kps)

For paging messages from the PS domain, if the CN adds DRX

Cycle Length Coefficient to the paging message, K = Min (Kcs,Kps, DRX Cycle Length Coefficient).If the CN does not add DRX

Cycle Length Coefficient to the paging message, K = Min(Kcs,Kps).


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DRX cycle length coefficient

When the UE is in the PCH state, the RNC calculates K in

the DRX period according to Kcs, Kps, KUtran, and DRX

Cycle Length Coefficient in the paging message from the

CN.

For paging messages from the CS domain, K = Min(Kcs,KUtran)

For paging messages from the PS domain, if the CN adds DRXCycle Length Coefficient to the paging message, K = Min (Kps,

KUtran, DRX Cycle Length Coefficient). If the CN does not add

DRX Cycle Length Coefficient to the paging message, K =

Min(Kps,KUtran).


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System Information

RRC Connection Setup

NAS Connection

RRC Connection Release

Called Signaling Flow


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PAGING TYPE 2

When the UE is in the DCH or FACH state, theUTRAN initiates the paging process and sends a

paging message of PAGING TYPE 2 over the

DCCH channel. The UTRAN configures paging

cause in the message. After the UE in the DCH orFACH state receives the message of PAGING

TYPE 2, it starts the paging reception process and

reports paging cause and paging record type

identifier to the upper layer.


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Paging Area

CellUMTSRegistrationArea

RoutingArea

LocationArea

CN

Different paging area for UE in different RRC state

Cell_DCH

Cell_FACH Idle mode

URA_PCH


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UTRAN DRX Cycle Length Coefficient

Parameter Name KUtran

Description This parameter is used for the discontinuous reception of UE

in the connection mode. This parameter is used to calculate

the paging occasion, that is, a constant required in monitoring

the PICH cycle. The discontinuous reception cycle is 2k

frames.

Range and Step 39Default Value 6



>RNC Radio Resource Management ->UTRAN DRX Cycle

Length Coefficient


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Sending Times of Paging Message

Parameter Name PagingSendTimes

Description The system has not obtained the information on the number of

retransmitted paging message when receiving no response. If

the value of this parameter increases, the possibility of paging

success will increase. With the increase of the Uu interface

messages, the Uu interface becomes more time consuming.



Resource Management->UtranCell->Advanced Parameter

Manage ->UtranCell ->Sending Times of Paging Message


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CS Domain DRX Cycle Length Coefficient

Parameter Name Kcs

Description The parameter allows a UE in the Idle or PCH state to

calculate the paging occasion so that it can monitor the PICH

channel at the time specified by the parameter.

Range and Step 69

Default Value 6

Configuration

Path


Resource Management->Advanced Parameter Manage ->

CN System Infomation ->CS Domain DRX Cycle Length

Coefficient

PS D i DRX C l L h C ffi i


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PS Domain DRX Cycle Length Coefficient

Parameter Name Kps

Description The parameter allows a UE in the Idle or PCH state to

calculate the paging occasion so that it can monitor the PICH

channel at the time specified by the parameter.

Range and Step 69

Default Value 6

Configuration

Path



CN System Infomation ->PS Domain DRX Cycle Length

Coefficient

N b f P i I di t PICH F


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Number of Paging Indicators per PICH Frame

Parameter Name Np

Description The larger the parameter, the higher the paging success rate,

but the larger the transmit power of the PICH channel.


Default Value 18

Configuration

Path


Resource Management->UtranCell->Advanced Parameter

Manage ->PICH ->Number of Paging Indicators per PICH

Frame

PICH P


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PICH Power

Parameter Name PichPwr

Description This parameter indicates the PICH transmission power, which

is an offset relative to the Primary CPICH power.

Range and Step -105dB step 1dB

Default Value -7dB

Configuration

Path



Power Control not Related to Service -> PICH Power

C t t


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Content


UMTS Random Access


PRACH St t


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PRACH Structure

Message partPreamble

4096 chips10 ms (one radio frame)

Preamble Preamble

Message partPreamble

4096 chips 20 ms (two radio frames)

Preamble Preamble


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M P t


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Message Part

k=0, 1, 2 and 3 corresponds respectively to the spectrum spreading

factors adopted by the message part: SF=256, 128, 64 and 32.

Pilot

Npilotbits

Data

Ndatabits

Slot #0 Slot #1 Slot #i Slot #14

Tslot= 2560 chips, 10*2kbits (k=0..3)

Message part radio frame TRACH= 10 ms

Data

ControlTFCI

NTFCIbits

Ch li d d f PRACH t


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Channelized code of PRACH message part

The spectrum spreading code used by the control part of PRACH is cc

= Cch,256,m.where m = 16s + 15.

The spectrum spreading code used by the data part of PRACH is cd

=Cch,SF,m.where SF=256, 128, 64, 32 are the spectrum spreading

factor of the data part, m = SFs/16.

s(0 s15) is the serial number of the signature used by the PRACH

preamble part among all 16 PRACH preamble signatures.

Number of bits carried in PRACH message vs spectrum spreading

factor:

Slot

Format #i

Channel Bit

Rate (kbps)

Channel Symbol

Rate (ksps)

SF Bits/

Frame

Bits/

Slot

Ndata

0 15 15 256 150 10 10

1 30 30 128 300 20 20

2 60 60 64 600 40 40

3 120 120 32 1200 80 80

R d A P f Ph i l L


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Random Access Process of Physical Layer

Select an available access slot

Select a signature

Set the preamble retransmission counter

The UE calculates the initial transmit power of preamble

If the UE fails to receive, in the DL access slot corresponding to the

slot that sends the UL access preamble, the positive or negativeresponse (AI = +1 nor1) corresponding to the selected signature on

AICH, Increase the transmit power of random access preamble by one

PRStep.

If the UE receives, in the DL access slot corresponding to the slot that

sends the UL access preamble, the positive response correspondingto the selected signature on AICH, then the UE sends the message

part of random access.

RACH access slot set


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RACH access slot set

PRACH has totally 15 slots of 20ms and the slots belongs to two

access slot sets. Access slot set 1 includes: slot 0~7 starting from p-a chips before the

DL P-CCPCH frame of SFN mod 2=0.

Access slot set 2 includes: slot 8~14 starting from p-a2560chips

before the DL P-CCPCH frame of SFN mod 2=1.

AICH accessslots

10 ms

#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4p-a

#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4

PRACHaccess slots

SFN mod 2 = 0 SFN mod 2 = 1

10 ms

Access slot set 1 Access slot set 2

RACH Sub channel


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RACH Sub-channel

RACH sub-channel defines a subset of all UL access slots.

Mapping relation between available UL access slot and

RACH sub-channel:

SFN modulo 8 of

corresponding

P-CCPCH frame

Sub-channel number

0 1 2 3 4 5 6 7 8 9 10 110 0 1 2 3 4 5 6 7

1 12 13 14 8 9 10 11

2 0 1 2 3 4 5 6 7

3 9 10 11 12 13 14 8

4 6 7 0 1 2 3 4 5

5 8 9 10 11 12 13 14

6 3 4 5 6 7 0 1 2

7 8 9 10 11 12 13 14

PRACH/AICH timing relation


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PRACH/AICH timing relation

The AICH frame is 20ms long and divided into 15 slots,

each slot with 5120 chips.

One access slot

p-a

p-mp-p

Pre-amble

Pre-amble Message part

Acq.Ind.

AICH accessslots RX at UE

PRACH accessslots TX at UE


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Available Signature


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Available Signature

Parameter Name Signature

Description This parameter indicates all effective signatures when thePRACH is used. 16 bit represents 16 signatures; the bit which

equals 1 means the corresponding signature is valid. Each

signature corresponds one by one to the channelization code

number of PRACH whose SF is 16.

Range and Step Bit0: sig0..

Bit15: sig15,

Bit=1 means the corresponding signature is valid.

Default Value Each bit is 1

ConfigurationPath View->Configuration Management->RNC NE->RNC RadioResource Management->External UTRAN Cell-> External

UTRAN Cell XXX-> Advanced Parameter Manager->PRACH-

> Available Signature

PRACH Available SF


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PRACH Available SF

Parameter Name AvailableSF

Description This parameter indicates the minimum effective spreadingfactor that this PRACH can use (limiting the maximum rate

that the PRACH can transmit). The greater the minimum

effective spreading factor is, the lower the maximum rate

becomes at which the PRACH can transmit.


Configuration

Path


Resource Management-> UTRAN Cell-> Advanced Parameter

Manager->PRACH-> PRACH Available SF

PRACH Preamble Power Ramp Step


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PRACH Preamble Power Ramp Step

Parameter Name PRStep

Description This parameter indicates the power ramp step used by the UEwhen it does not receive any responses from AICH after

sending a preamble. This parameter is used to be added to

the previous power, and then the next preamble is sent at this

new power.

Range and Step 18dB step 1dBDefault Value 1dB

Configuration

Path



Manager->PRACH-> PRACH Preamble Power Ramp Step(dB)

Maximum Number of Preamble Being


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TransmittedParameter Name MaxPreamRetrans

Description This parameter indicates the maximum number that theaccess preamble can be sent before L1 receives ACK or

NACK.

Range and Step 164

Default Value 40

Configuration

Path



Manager->PRACH-> Maximum Number of Preamble Being

Transmitted

Power Offset between PRACH Control Part


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and PRACH Data PartParameter Name POPpm

Description This parameter indicates the power offset between controlpart of the PRACH message part and the last preamble. It

should be configured for each TFC.

Range and Step -5,10dB step 1dB

Default Value 2

Configuration

Path


Resource Management-> Advanced Parameter Manager-

>Transmission Format Composition Set of PRACH-> Power

Offset between PRACH Control Part and PRACH Data

Part(dB)

PRACH Available SubChannel Number


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PRACH Available SubChannel Number

Parameter Name AvailSubChanNum

Description This parameter indicates the available effective sub-channelnumber of this PRACH. The sub-channel number actually

defines the available time slot for the PRACH. The bit

indicates whether this sub-channel number is valid or not.

Each sub-channel number can correspond to several access

slots. For several PRACHs in the same cell, their sub-channel

numbers must be different from each other.

Range and Step bit0: subch0

..

bit11: subch11

Bit=1 means the corresponding sub channel is valid.

Default Value Each bit is 1

Configuration

Path


Resource Management-> UTRAN Cell-> UTRAN Cell XXX->

Advanced Parameter Manager->PRACH-> PRACH Available

SubChannel Number

Maximum Allowed UL TX Power of RACH


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Maximum Allowed UL TX Power of RACH

Parameter Name MaxRACHTxPwr

Description This parameter indicates the maximum allowed ULtransmission power of RACH. If the parameter value is

increased, the maximum allowed UL transmission power of

RACH increases. If the parameter value is decreased, the

maximum allowed UL transmission power of RACH decreases.

Range and Step -5033dBmDefault Value 24dBm

Configuration

Path



Advanced Parameter Manager->PRACH-> Maximum Allowed

UL TX Power of RACH(dBm)

Maximum Number of Preamble Ramping


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CyclesParameter Name Mmax

Description This parameter indicates the maximum times for re-sendingattempts on MAC layer. When the physical layer returns

NACK (unacknowledged) or NO ACK (Node B does not

response), adds the attempt times, M, by 1.When M is over

Mmax, the MAC layer stops the access process. When the

parameter value is increased, the MAC layer makes more

sending attempts. When the parameter value is decreased,

the MAC layer makes less sending attempts.

Range and Step 132

Default Value 6

ConfigurationPath View->Configuration Management->RNC NE->RNC RadioResource Management-> UTRAN Cell-> UTRAN Cell XXX->

Advanced Parameter Manager->PRACH-> Maximum Number

of Preamble Ramping Cycles

Detected Preamble Threshold


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Detected Preamble Threshold

Parameter Name PreamThs

Description This parameter indicates the preamble judgment thresholdwhen Node B detects preambles. To make the access

preamble of the PPRACH transmission be detected by Node

B, the proportion of the received preamble power in the

preamble cycle and the interference level should be larger

than this parameter.

Range and Step -36.00.0dB step 0.5dB

Default Value -24dB

Configuration

Path



Advanced Parameter Manager->PRACH-> Detected

Preamble Threshold(dB)

Content


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Content


UMTS Random Access




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A dedicated channel

A common channel

UE UTRAN

RRC CONNECTION REQUEST

RRC CONNECTION SETUP

RRC CONNECTION SETUP COMPLETE

The signaling flow in signal trace tool


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The signaling flow in signal trace tool



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RNCRRC Connection Setup Request

RNC decides on what kind of channelthe RRC connection will be established

according to the setting of the OMCR

parameter InitRrcOnDch

RRC Connection Setup Cause =

to set up services

InitRrcOnDch = 1 InitRrcOnDch = 3 InitRrcOnDch = 4InitRrcOnDch = 0 InitRrcOnDch = 2

DCH mandatory

and common

signaling

DCH mandatory

and High-speed

signaling

Not mandatory

and use common

signaling for

DCH state

Not mandatory

and use high-

speed signaling

for DCH state

DCH is used to setup

RRC Connection

Common Channel is used

to setup RRC Connection

FACH mandatory

Establishing a RRC Connection over a


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Dedicated Transport channel

When receiving the RRC CONNECTION REQUEST

message from a UE, the RNC specifies the channel overwhich the RRC connection is to be established according

to the parameter InitRrcOnDch.

If the parameter InitRrcOnDchis set to 0 (Forced to DCH and

Using Normal Speed Signaling) or 1 (Forced to DCH and Using13.6Kbps signaling), or 5(Forced to DCH and using 27.2Kbps), the

RNC establishes the RRC connection over the DCH channel.

If the parameter InitRrcOnDchis set to 3 (Not Forced, Using

3.4Kbps Signaling on Cell-DCH State) or 4 (Not Forced, Using

13.6kbps Signaling on Cell-DCH State), or 6(Not Forced, Using27.2Kbps Signaling on Cell-DCH State), the RNC selects to

establish the RRC connection over the DCH according to the

establishment cause in the RRC CONNECTION REQUEST

message.

Establishing a RRC Connection over a


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Common Transport channel

When receiving the RRC CONNECTION REQUEST

message from a UE, the RNC specifies the channel overwhich the RRC connection is to be established according

to the parameter InitRrcOnDch.

If the parameter InitRrcOnDchis set to 2 (Forced to FACH), the

RNC establishes the RRC connection over the FACH channel. If the parameter InitRrcOnDchis set to 3 , 4, or 6, the RNC

establishes the RRC connection according to the establishment

cause. If there is only a signaling process, instead of setting up

services(for example, the value of establishment cause is

registration ), RNC will select common channel to bear signaling.

Wireless Link Setup Failure


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Wireless Link Setup Failure

If the radio link setup fails, the RNC sends the

RRC CONNECTION REJECT message to the UE

and fills in Wait Time in the message. The

parameter Wait Time specifies the duration (from

the reception of the RRC CONNECTION REJECTmessage to the time of sending access request)

during which the UE has to wait.

Failure to Receive RRC Connection Setup

R F UE


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Response From UE

If RNC havnt received RRC CONNECTION

SETUP COMPLETE for waiting 5 seconds from

the first transmitting of RRC CONNECTION

SETUP, the RRC connection setup fails. The UE

is still in idle mode.

Releasing the RRC Connection


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Releasing the RRC Connection

The connection carrying services data or NAS signaling is released

normally. The Node B detects radio link failure.

The RNC monitors the RLC connection failure.

The UE in the DCH or FACH state sends CELL UPDATE message.

The value of AM_RLC error indication is true.

The UE in the FACH state sends the CELL UPDATE message to the

RNC. The cause is Radio link failure or RLC unrecoverable error.

UE(DCH) RNC



Complete

(SRB1)

UE(FACH) RNC



Complete

(SRB2/CCCH)

(CCCH)

RRC connection release flow


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RRC connection release flowSource

Node BUE

RRCRRC CONNECTI ON RELEASE

[ DCCH UM RLC ]

Target

Node B

Dr i f t

RNC

Source

RNC

RRC

RRCRRC CONNECTI ON RELEASE COMPLETE

[ DCCH UM RLC / AM RLC ]RRC

ConditionRRC connection release on DCH

RL Del et e

RRCRRC CONNECTI ON RELEASE

[ CCCH UM RLC ]RRC

ConditionRRC connection release on CCCH


RRC CONNECTION RELEASE M


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RRC CONNECTION RELEASE MessageParameter Name NReTran

Description The parameter specifies the number of the RRCCONNECTION RELEASE messages retransmitted by the

RNC after the UE does not return the RRC CONNECTION

RELEASE COMPLETE message. If the value of this

parameter decreases, the possibility of process failed will

increase.

Range and Step 110

Default Value 3

Configuration

Path



>RNC Radio Resource Management ->Maximum Number of

Retransmissions of the RRC CONNECTION RELEASE

Message

Wait Time for RRC Connection

R t bli h t


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ReestablishmentParameter Name Twait

Description The smaller the parameter, it is easier to trigger accessrequest flow, the larger the chance of second failure.

Range and Step 015s

Default Value 5s

Configuration

Path



>RNC Radio Resource Management ->Wait Time for RRC

Connection Reestablishment(s)

Number of FDD UMTS Frequency Range


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q y g

Parameter Name FDDFreqRngNum

Description This parameter indicates the number of UTRAN FDDfrequency range controlled by the local PLMN. When UE

comes back to idle mode from RRC connected mode, UE

selects one cell to reside. UTRAN contains this parameter in

the message of RRC CONNECTION RELEASE, indicating the

possible frequency range in UTRAN cells. This parameter

helps UE to speed up the process of cell searching.

Range and Step 032

Default Value 2

Configuration

Path


Resource Management->RPLMN Range Information ->

Number of FDD UMTS Frequency Range

Number of GSM BA Range


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g

Parameter Name GsmBARangeNum

Description This parameter indicates the number of GSM BCCHdistribution tables. When UTRAN network and BSS network

belong to the same PLMN at the same time and UE has

transferred from RRC connected mode to Idle mode, UE will

selects one cell to reside. UTRAN contains this parameter in

the message of RRC CONNECTION RELEASE, indicating the

possible BCCH frequency range of neighboring GSM cells ofthe BSS network. This parameter helps UE to speed up the

process of cell searching.

Range and Step 032

Default Value 3

Configuration

Path


Resource Management->RPLMN Range Information ->

Number of GSM BA Range

GSM Lower Range


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g

Parameter Name GsmLRange32

Description This parameter indicates the frequency lower range of aspecific GSM BCCH distribution table that the local PLMN

controls. When UTRAN network and BSS network belong to

the same PLMN at the same time and UE has transferred

from RRC connected mode to Idle mode, UE will selects one

cell to reside. UTRAN contains this parameter in the message

of RRC CONNECTION RELEASE, indicating the possibleBCCH frequency range of neighboring GSM cells of the BSS

network. This parameter helps UE to speed up the process of

cell searching.

Range and Step [01023]

Default Value N/A


Resource Management->RPLMN Range Information ->GSM

Lower Range

GSM Upper Range


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pp g

Parameter Name GsmURange32

Description This parameter indicates the frequency upper range of aspecific GSM BCCH distribution table that the local PLMN

controls. When UTRAN network and BSS network belong to

the same PLMN at the same time and UE has transferred

from RRC connected mode to Idle mode, UE will selects one

cell to reside. UTRAN contains this parameter in the message

of RRC CONNECTION RELEASE, indicating the possibleBCCH frequency range of neighboring GSM cells of the BSS

network. This parameter helps UE to speed up the process of

cell searching.

Range and Step [01023]

Default Value N/A


Resource Management->RPLMN Range Information ->GSM

Upper Range

UARFCN (Nlow)


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( )

Parameter Name Luarfcn 8

Description This parameter indicates the frequency lower range of aspecific UTRAN FDD frequency that the local PLMN controls.

When UE state is transferred from RRC connected mode to

idle mode, UE selects one cell to reside. UTRAN contains this

parameter in the message of RRC CONNECTION RELEASE,

indicating the possible transmission frequency range of the

UTRAN cells. This parameter helps UE to speed up theprocess of cell searching.

Range and Step Band I: [10562, 10838]

Band II: [9662, 9938]

Default Value N/A


Resource Management->RPLMN Range Information -

>UARFCN (Nlow)

UARFCN(Nupper)


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( pp )

Parameter Name Uuarfcn8

Description This parameter indicates the frequency upper range of aspecific UTRAN FDD that the local PLMN controls. When UE

state is transferred from RRC connected mode to idle mode,

UE selects one cell to reside. UTRAN contains this parameter

in the message of RRC CONNECTION RELEASE, indicating

the possible transmission frequency range of the UTRAN cells.

This parameter helps UE to speed up the process of cellsearching.

Range and Step Band I: [10562, 10838]

Band II: [9662, 9938]

Default Value N/A


Resource Management->RPLMN Range Information -

>UARFCN(Nupper)

Type of Transport Channel for Initial RRC

Connection Setup


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Connection SetupParameter Name InitRrcOnDch

Description This parameter indicates the type of transport channel andsignaling rate for initial RRC connection setup.

Range and Step 0:forcedly establish the RRC connection over the DCH

channel and use the common signaling

1: Forcedly establish the RRC connection over the DCH

channel and use the high speed signaling

2: Forcedly establish the RRC connection over the FACH

channel and use the high speed signaling

3:Establish the RRC connection over the DCH channel in a

non-forced manner and use the common signaling

4: Establish the RRC connection over the DCH channel in a

non-forced manner and use the high speed signaling.Default Value 1


Resource Management->Basic Infomation ->Type of

Transport Channel for Initial RRC Connection Setup

Content


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UMTS Random Access

UMTS RRC Connection Setup and Release

Access Failed Case

Description


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p

Customer complained that it was difficult to access

the network in office, and it was too long to wait.

Analysis


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y

The drive test shows that the

receiving level of UE is normal.Besides, there is no alarm

related to hardware.

The Performance Management

System(PMS) software of NodeB

shows the statistics ofaccessing. A large amount of

rejection of access is found,

which occupied the

demodulation resource, causing

the long time to wait for a call

connection.

Analysis


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Preamble_Initial_Power = Primary CPICH DL TX

powerCPICH_RSCP + UL interference +

Constant Value

Primary CPICH DL TX power CPICH_RSCP is the

Pathloss of downlink.

UE UTRAN

CPICH

Preamble

AICH

..Preamble

Message of

PRACH

Analysis


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Use the signaling trace tools of OMCR, RNC didnt

receive the RRC Connection Request message.

Use the BMC TRACE, find Rach CRC Error.So,

we make a conclusion that the Preamble

Threshold is too big which result in the messagetransmit power is very low, and NodeB cannot

receive the message.

Solution


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Solution

Change the Preamble Threshold:-24dB -21dB

Constant Value:-21dB -18dB

Result

Test again, make a call 120 times, all the calls aresuccessful.

Access Failed Case


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-21-21dB

-18dB


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zte umts access contro

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