001 mtc owo113010 wcdma ue behaviors in idle mode issue1.02

8/18/2019 001 Mtc Owo113010 Wcdma Ue Behaviors in Idle Mode Issue1.02

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WCDMA UE Behaviors in Idle Mode

HUAWEI Mexico Training Center 1



PLMN selection


HUAWEI Mexico Training Center

Used to ensure that the PLMN selected by the UE provides services properly.

System information reception

The network broadcasts the network information to the UE that camps on the cell. Upon

reception of broadcast information, the UE obtains the network information and takes

actions accordingly.

Cell selection and reselection

Used to ensure that the UE finds a suitable cell to camp on.

Location registration

This procedure is used by the UE to report its status to the network. This procedure is of

two types: periodical location registration and the location registration necessitated by

changes in the location area.

Paging procedure

Used for the network to send paging messages to a UE which is in idle mode, CELL_PCH

state, or URA_PCH state.

Access procedure

From the view of access stratum, access is the procedure the UE shift from idle mode to

connected mode.

2



Typical scenario of first occasion is the first time a new UE is put into use.



The second occasion is very common.

6



Step 1: Slot synchronization



During the first step of the cell search procedure, the UE uses the primary synchronisation

code (PSC) to acquire slot synchronisation to a cell.

Step 2: Frame synchronization and code-group identification

During the second step of the cell search procedure, the UE uses the secondary

synchronisation code (SSC) to find frame synchronisation and identify the code group of the

cell found in the first step.

Step 3: Primary scrambling code identification

During the last step of the cell search procedure, the UE determines the exact primary

scrambling code used by the found cell. The primary scrambling code is typically identified

through symbol-by-symbol correlation over the CPICH with all codes within the code group

identified in the second step.

If the UE has received information about which scrambling codes to search for, steps 2 and

3 above can be simplified.

7



The UE can get system information from PCCPCH, and the PLMN information is transmitted



in MIB of PCCPCH.

After getting the MIB, the UE can judge whether the current PLMN is right one. If so, the UE

will get SIB scheduling information from the MIB; if not, the UE will search another carrier,

do this procedure again.

The priority order of automatic PLMN selection mode:

Order PLMN types Remark

1 HPLMNs Home PLMNs

2 PLMNs contained in the “User Controlled PLMNSelector with Access Technology” data filed in the SIM

excluding the previously selected PLMN

The PLMNs are arranged inpriority order

3 PLMNs contained in the “Operator Controlled PLMNSelector with Access Technology” data filed in the SIM

excluding the previously selected PLMN


4 Other PLMN/Access technology combinations with thehigh quality of received signals excluding the previously

selected PLMN


5 Other PLMN/Access technology combinations excluding

the previously selected PLMN

The PLMNs are arranged in

the descending order of

signal quality

6 Previously selected PLMN The PLMN selected by the UE

before automatic PLMN

selection

8



The MCC and MNC, which are in the PLMN identity of the HPLMN, match the MCC and MNC



in the IMSI of the UE.

Except the HPLMNs, the PLMNs that the UE camps on are defined as VPLMNs.

For the PLMN selection in the VPLMN, a value of T minutes may be stored in the SIM. Either

T is in the range 6 minutes to 8 hours with a step of 6 minutes or T indicates that no

periodic attempts shall be made. If no value is stored in the SIM, a default value of 60

minutes is used.

When the UE attempts to access the HPLMN or the PLMN with higher priority, the UE must

adhere to the following rules:

After the UE is switched on, a period of at least two minutes and at most T minutes

shall elapse before the first attempt is made.

Periodic attempts shall be performed only by the UE in idle mode.

Only the priority levels of equivalent PLMNs of the same country (which serve as the

current serving VPLMN) can be compared with the priority level of a selected PLMN.

9



System information is used for the network to broadcast network information to UEs



camping on a cell so as to control the behavior of UEs.

MIB

When selecting a new cell, the UE reads the MIB. The UE may locate the MIB by

predefined scheduling information. The IEs in the MIB includes MIB value tag, PLMN

type, PLMN identity, reference and scheduling information for a number of SIBs in a

cell or one or two SBs in a cell.

SB

Scheduling Block (SB) gives reference and scheduling information to other SIBs.

SIB

System Information Block (SIB) contains actual system information. It consists of

system information elements (IEs) with the same purpose.

Scheduling information for an SIB may only be included in either the MIB or one of the SB.

UE may use the scheduling information in the MIB and SB to locate each SIB to be acquired.

If UE received an SIB in a position according to the scheduling information and considers the

contents as valid, UE will read and store the SIB.

11



SIB4: contains parameters for cell selection and cell re-selection while UE is in connected



mode.

SIB6: contains parameters for the common physical channels of the cell while UE is in

connected mode.

SIB8: contains the CPCH static information.

SIB9: contains the CPCH dynamic information.

SIB10: contains information to be used by UEs having their DCH controlled by a DRAC

procedure. Used in FDD mode only. To be used in CELL_DCH state only. Changes so often, its

decoding is controlled by a timer.

SIB12: contains measurement controlling information in connecting mode.

SIB13: contains ANSI-41 system information.

SIB14: contains the information in TDD mode.

SIB15: contains the position service information.

SIB16: contains the needed pre-configuration information for handover from other RAT to

UTRAN.

SIB17: contains the configuration information for TDD.

SIB18: contains the PLMN identities of the neighboring cells.

To be used in shared networks to help with the cell reselection process.

12



Camped normally: The cell that UE camps on is called the suitable cell. In this state, the UE



obtains normal services.

Any cell selection: In this state, the UE shall attempt to find an acceptable cell of any PLMN

to camp on, trying all RATs that are supported by the UE and searching first for a high

quality cell.

Camped on any cell: The cell that UE camps on is called the acceptable cell. In this state the

UE obtains limited services. For example, UE may originate emergency call. The UE shall

regularly attempt to find a suitable cell of the selected PLMN, trying all RATs that are

supported by the UE.

Connected mode: After RRC connection setup, the UE changes from the idle mode to the

connected mode (CELL_DCH, CELL_FACH, CELL_PCH, or URA_PCH state).

Cell selection of the UE leaving the connected mode:

When returning to the idle mode from the connected mode, the UE shall select a

suitable cell to camp on. Candidate cells for this selection are the cells used

immediately before the UE leaves the connected mode.

When returning to the idle mode after an emergency call on any PLMN, the UE shallselect an acceptable cell to camp on. Candidate cells for this selection are the cells

used immediately before the UE leaves the connected mode.

If no acceptable cell is found, the UE shall continue to search for an acceptable cell

on any PLMN in the state "Any cell selection".

15



Initial cell selection: If no cell information is stored for the PLMN, the UE starts the initial cell



selection. For this procedure, the UE need not know in advance which Radio Frequency (RF)

channels are UTRA bearers. The UE scans all RF channels in the UTRA band according to its

capabilities to find a suitable cell of the selected PLMN. On each carrier, the UE need only

search for the strongest cell. Once a suitable cell is found, this cell shall be selected.

Stored information of cell selection: For this procedure, the UE has to know the central

frequency information and other optional cell parameters that are obtained from the

measurement control information received before, such as scrambling codes. After this

procedure is started, the UE selects a suitable cell if any. Otherwise, the "Initial cell

selection" procedure is triggered.

17



If the pilot strength and quality of one cell meet S criteria, UE will stay in this cell and get



other system information. Then, UE will initiate a location update registration process.

If the cell doesn’t satisfy S criteria, UE will get adjacent cells information from SIB11. Then,

UE will judge weather these cells satisfy S criteria. If the adjacent cell is suitable, UE will stay

in the adjacent cell.

If no cell satisfies S criteria, UE will take the area as dead zone and continue the PLMN

selection and reselection procedure.

Parameter Description

S qual Cell selection quality value (dB)

S rxlev Cell selection RX level value (dBm)

Q qualmeas Measured cell quality value. The quality of the received signal indicated in average

CPICH Ec/No (dB) for current cell

Q rxlevmeas Measured cell RX level value. This RX level of the received signal indicated CPICH

RSCP (dBm) for current cell

Q qualmin Minimum required quality level in the cell (dB)

Q rxlevmin Minimum required RX level in the cell (dBm)

P compensation Max (UE_TXPWR_MAX_RACH – P_MAX, 0) (dB)

UE_TXPWR_M

AX_RACH

MaxAllowedUlTxPower , Max allowed UE UL Tx Power (dBm)

P_MAX Maximum RF output power of the UE (dBm)

18



Qqualmin



Content: The minimum required quality level corresponding to CPICH Ec/No. The UE

can camp on the cell only when the measured CPICH Ec/No is greater than the value

of this parameter.

Value range: -24~0

Physical value range: -24~0; step: 1

Physical unit: dB

Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL,

and modify it through MOD CELLSELRESEL.

Qrelevmin

Content: The minimum required RX level corresponding to CPICH RSCP. The UE can

camp on the cell only when the measured CPICH RSCP is greater than the value of

this parameter.

Value range: -58~-13

Physical value range: -115~-25; step: 2 (-58: -115, -57: -113, ..., -13 :-25)

Physical unit: dBm



19



MaxAllowedUlTxPower



Content: The maximum allowed uplink transmit power of a UE in the cell, which is

related to the network planning.

Value range: -50~33


Physical unit: dBm



20



If Squal > Sintrasearch , the UE need not start the intra-frequency measurement.



If Squal ≤ Sintrasearch , the UE need to start the intra-frequency measurement.

If system messages do not contain Sintrasearch , the UE always need to start the intra-

frequency measurement.

Parameters of the measurement start criteria:

Name Description

S qual Cell quality value (dB)

Q qualmin Minimum required quality level in the cell (dB)

S intrasearch Measurement threshold for UE to trigger intra-frequency cell reselection

S intersearch Measurement threshold for UE to trigger inter-frequency cell reselection

S searchRATm Measurement threshold for UE to trigger inter-RAT cell reselection

22



If Squal > Sintersearch , the UE need not start the inter-frequency measurement.



If Squal ≤ Sintersearch , the UE need to start the inter-frequency measurement.

If system messages do not contain Sintersearch , the UE always need to start the inter-

frequency measurement.

23



If Squal > SsearchRATm , the UE need not start the inter-RAT measurement.



If Squal ≤ SsearchRATm , the UE need to start the inter-RAT measurement.

If system messages do not contain SsearchRATm , the UE always need to start the inter-RAT

measurement.

24



IdleSintrasearch



Content: A threshold for intra-frequency cell reselection in idle mode. When the

quality (CPICH Ec/No measured by UE) of the serving cell is lower than this threshold

plus the [Qqualmin ] of the cell, the intra-frequency cell reselection procedure will be

started. This parameter is not configured when its value is 127.

Value range: {{-16~10}, {127}}


Physical unit: dB



ConnSintrasearch

Content: A threshold for intra-frequency cell reselection in connect mode. When the


plus the [Qqualmin ] of the cell, the intra-frequency cell reselection procedure will be


Value range: {{-16~10}, {127}}


Physical unit: dB



25



IdleSintersearch



Content: A threshold for inter-frequency cell reselection in idle mode. When the


plus the [Qqualmin ] of the cell, the inter-frequency cell reselection procedure will be


Value range: {{-16~10}, {127}}


Physical unit: dB



ConnSintersearch

Content: A threshold for inter-frequency cell reselection in connect mode. When the


plus the [Qqualmin ] of the cell, the inter-frequency cell reselection procedure will be


Value range: {{-16~10}, {127}}


Physical unit: dB



26



SearchRat



Content: A threshold for inter-RAT cell reselection. When the quality (CPICH Ec/No

measured by UE) of the serving cell is lower than this threshold plus the [Qqualmin ]

of the cell, the inter-RAT cell reselection procedure will be started. This parameter is

not configured when its value is 127.

Value range: {{-16~10}, {127}}


Physical unit: dB



27



The intra-frequency, inter-frequency, and inter-RAT measurement criteria are as shown in



the above figure.

The intra-frequency cell reselection has a priority higher than the inter-frequency cell

reselection and inter-RAT cell reselection, the intra-frequency cell reselection start threshold

should be higher than the inter-frequency cell reselection start threshold and inter-RAT cell

reselection start threshold.

If the cell reselection threshold is set to a comparatively high value, the UE may frequently

start cell reselections, and the battery of the UE may be largely consumed. If the cell

reselection threshold is set to a comparatively low value, it is difficult for cell reselections to

be started, and the UE may not timely reside in the cells with good quality, affecting the

quality of communication between the UTRAN and the UE. For detailed information, refer to

3GPP TS 25.304.

28



In Rs , s means serving cell. In Rn , n means neighbor cell.



The offset Qoffset1s,n is used for Qoffsets,n to calculate Rn . The hysteresis Qhyst1s is used

for Qhysts to calculate Rs .

The UE shall rank the cells according to the R criterion, derive Qmeas,n and Qmeas,s and

calculate the R values, as described in the following cases:

If a TDD or GSM cell is ranked as the best cell, the UE shall reselect that TDD or GSM

cell.

If an FDD cell is ranked as the best cell and the quality measure for cell selection and

reselection is set to CPICH RSCP (QualMeas = CPICH_RSCP ), the UE shall reselect that

FDD cell.

If an FDD cell is ranked as the best cell and the quality measure for cell selection and

reselection is set to CPICH Ec/N0 (QualMeas = CPICH_ECNO ), the UE shall perform a

second ranking of the FDD cells according to the R criteria specified above. In this

case, however, the UE uses the measurement quantity CPICH Ec/N0 for deriving the

Qmeas,n and Qmeas,s and then calculating the R values of the FDD cells. The offset

Qoffset2s,n is used for Qoffsets,n to calculate Rn , the hysteresis Qhyst2s is used forQhysts to calculate Rs .

29



In all the previous cases, the UE can reselect a new cell only when the following conditions



are met:

The new cell is better ranked than the serving cell during a time interval

Treselections .

More than one second has elapsed since the UE camped on the current serving cell.

30



QualMeas



Content: Measurement quantity of cell selection and reselection. It can be set to

CPICH Ec/N0 or CPICH RSCP.

Value range: CPICH_ECNO(CPICH Ec/N0), CPICH_RSCP(CPICH RSCP)

Physical value range: CPICH_ECNO, CPICH_RSCP

Physical unit: None



Treselections

Content: If the signal quality of a neighboring cell is better than that of the serving

cell during the specified time of this parameter, the UE reselects the neighboring cell.

It is used to avoid ping-pong reselection between different cells.

Value range: 0~31

Physical value range: 0~31; step: 1

Physical unit: s



31



IdleQhyst1s



Content: The hysteresis value of the serving FDD cells in idle mode in case the quality

measurement for cell selection and reselection is set to CPICH RSCP. It is related to

the slow fading feature of the area where the cell is located. The greater the slow

fading variance is, the greater this parameter.

Value range: 0~20


Physical unit: dB



ConnQhyst1s

Content: The hysteresis value of the serving FDD cells in connected mode in case the

quality measurement for cell selection and reselection is set to CPICH RSCP. It is

related to the slow fading feature of the area where the cell is located. The greater

the slow fading variance is, the greater this parameter .

Value range: 0~20


Physical unit: dB



32



IdleQhyst2s



Content: The hysteresis value of the serving FDD cells in idle mode in case the quality

measurement for cell selection and reselection is set to CPICH Ec/No. It is related to

the slow fading feature of the area where the cell is located. The greater the slow

fading variance is, the greater this parameter.

Value range: {{0~20}, {255}}


Physical unit: dB

Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and

modify it through MOD CELLSELRESEL.

ConnQhyst2s

Content: The hysteresis value of the serving FDD cells in connected mode in case the

quality measurement for cell selection and reselection is set to CPICH Ec/No. It is

related to the slow fading feature of the area where the cell is located. The greater

the slow fading variance is, the greater this parameter.

Value range: {{0~20}, {255}}


Physical unit: dB

Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and

modify it through MOD CELLSELRESEL.

33



IdleQoffset1sn



Content: Offset of cell CPICH RSCP measurement value in cell selection or reselection

when the UE is in idle mode.

Value range: -50~+50

Physical value range: -50~+50; step: 1

Physical unit: dB

Set this parameter through ADD INTRAFREQNCELL / ADD INTERFREQNCELL, query it

through LST INTRAFREQNCELL / LST INTERFREQNCELL, and modify it through MOD

INTRAFREQNCELL / MOD INTERFREQNCELL.

ConnQoffset1sn

Content: Offset of cell CPICH RSCP measurement value in cell selection or reselection

when the UE is in connected mode. This parameter is used for cell offset in cell

selection and reselection. During cell reselection, the cell offset corresponding to

CPICH Ec/No is QOffset2sn, that to CPICH RSCP is QOffset1sn. Idle is used for idle

mode, and Conn for connected mode. ConnQoffset1sn and ConnQoffset2sn are valid

only when SIB12Ind = TRUE, namely, the SIB12 message is existing.



Physical unit: dB




34



IdleQoffset2sn



Content: Offset of cell CPICH Ec/No measurement value in cell selection or reselection

when the UE is in idle mode.



Physical unit: dB




ConnQoffset2sn

Content: Offset of cell CPICH Ec/No measurement value in cell selection or reselection

when the UE is in connected mode. This parameter is used for cell offset in cell

selection and reselection. During cell reselection, the cell offset corresponding to

CPICH Ec/No is QOffset2sn, that to CPICH RSCP is QOffset1sn. Idle is used for idle

mode, and Conn for connected mode. ConnQoffset1sn and ConnQoffset2sn are valid

only when SIB12Ind = TRUE, namely, the SIB12 message is existing.



Physical unit: dB




35



Location registration is used for the PLMN to trace the current status of the UE. Location



registration ensures that the UE is connected to the network when the UE does not perform

any operation for a long period.

The UE performs normal location registration in the following conditions:

After being switched on, the UE selects a suitable cell that belongs to a new LA or

RA. That is, the LA or RA is different from that recorded in the USIM before the

switch-off of the UE.

The UE in idle mode enters the cell of a new LA or RA.

37



Periodic location registration may be used to periodically notify the network of the



availability of the UE.

The value of T3212 is sent by the network to the UE in SIB1. The value of T3312 is sent by

the network to the UE in the messages ATTACH ACCEPT and ROUTING AREA UPDATE

ACCEPT. The value of T3312 shall be unique within an RA.

38



If the UE still stays in the same LA or RA after being switched on again, the UE shall perform



an LR request indicating IMSI attach. Otherwise, the UE shall perform an LR request

indicating normal location update.

When the IMSI attach/detach operation applies, the UE shall send the IMSI detach message

to the network when the UE is switched off or the SIM is removed while being in the

UPDATED state. This IMSI detach message will not be acknowledged by the network.

The system information contains an indicator indicating whether the IMSI attach/detach

operation is mandatory in the cell. The UE shall operate in accordance with the received

value of the indicator.

39



T3212



Content: This parameter indicates the time length of the periodical location update.

Periodical location update is implemented by MS through the location update

procedure. 0: The periodical update procedure is not used. This parameter is valid

only when [CN domain ID] is set as CS_DOMAIN.

Value range: 0~255


Physical unit: min

Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN,

modify it through MOD CNDOMAIN.

ATT

Content: Indicating whether attach/detach is allowed. NOT_ALLOWED indicates that

MS cannot apply the IMSI attach/detach procedure. ALLOWED indicates that MS can

apply the IMSI attach/detach procedure. This parameter is valid only when [CN

domain ID] is set as CS_DOMAIN.

Value range: NOT_ALLOWED, ALLOWED

Physical value range: NOT_ALLOWED, ALLOWED

Physical unit: None

Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN,


40



For CN originated paging:



In order to request UTRAN connect to UE, CN initiates the paging procedure,

transmits paging message to the UTRAN through Iu interface, and UTRAN transmits

the paging message from CN to UE through the paging procedure on Uu interface,

which will make the UE initiate a signaling connection setup process with the CN.

For UTRAN originated paging:

UE state transition: In order to trigger UE in the CELL_PCH or URA_PCH state to carry

out state transition (for example, transition to the CELL_FACH state), the UTRAN will

perform a paging process. Meanwhile, the UE will initiate a cell update or URA

update process, as a reply to the paging.

When the cell system message is updated: When system messages change, the

UTRAN will trigger paging process in order to inform UE in the idle, CELL_PCH or

URA_PCH state to carry out the system message update, so that the UE can read the

updated system message.

42



Paging type 1:



The message is transmitted in one LA or RA for idle state, or in one cell for

CELL_PCH state, or in one URA for URA_PCH state.

After calculating the paging time, the paging message will be transmitted at that

time.

If UE is in CELL_PCH or URA_PCH state, the UTRAN transmits the paging information

in PAGING TYPE 1 message to UE. After received paging message, UE performs a cell

update or URA update procedure to transit state to CELL_FACH.

As shown in the above figure, the CN initiates paging in a location area (LA), which is

covered by two RNCs. After receiving a paging message, the RNC searches all the cells

corresponding to the LAI, and then calculates the paging time, at which it will send the

PAGING TYPE 1 message to these cells through the PCCH.

43



Paging type 2:



If UE is in CELL_DCH or CELL_FACH state， the paging message will be transmitted

on DCCH with paging type 2.

The message will be only transmitted in a cell.

As shown in the above figure, if the UE is in the CELL_DCH or CELL_FACH state, the UTRAN

will immediately transmit PAGING TYPE 2 message to the Page d UE on DCCH channel.

44



Many problems will cause the target UE cannot receive the paging message properly:



Power setting of paging channel is unreasonable

Unreasonable paging strategies will result in paging channel congestion, which can

cause paging message loss

Paging parameter is unreasonable

Equipment fault

45



The DRX paging period formula:



DRX Cycle Length ＝ MAX(2k, PBP) frames

K is the “CN domain specific DRX cycle length coefficient”, which is broadcasted in

SIB1. The typical value is 6.

PBP is Paging Block Periodicity , which is 1 for FDD mode.

The paging period should be 640ms if K is 6.

46



Paging SFN formula:



Paging Occasion (CELL SFN) = {(IMSI div K) mod (DRX cycle length div PBP)} *PBP + n

*DRX cycle length + Frame Offset

n =0, 1, 2……and the requirement is the calculated CELL SFN must be below its

maximum value 4095.

Frame Offset is 0 for FDD mode.

K is the number of SCCPCH which carries PCH, and the typical value is 1.

The formula cloud be simplified as: SFN = IMSI mod (2^K) + n * (2^K).

47



As shown in the below figure, the UE needs to monitor the frames (paging occasions)



indicated by the red dots, and then decodes the qth PI of this frame. (The qth PI is obtained

based on the above formula).

If the UE has no IMSI, for instance when making an emergency call without USIM, the UE

shall use as default numbers, IMSI = 0 and DRX cycle length = 256 (2.56 s), in the formulas

above.

¡ £¡ £¡ £

0

2^K-1

0 4095

¡ £¡ £¡ £

P I P I P I P I¡ £¡ £¡ £¡ £¡ £¡ £

0 1 q NP-1

One DRX cycle

48



The timing relationship between PICH and SCCPCH is defined by the above figure, and the



interval is 3 slots duration (2ms, 7680 chips).

49



DRXCyclelenCoef



Content: This parameter is broadcasted on SIB1. This parameter is used when a UE is

in idle mode.

Value range: 6~9

Physical value range: 6~9

Physical unit: None

Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN, and


PICHMode

Content: Indicating the number of PIs contained in each frame on the PICH.

Value range: V18, V36, V72, V144

Physical value range: 18, 36, 72, 144

Physical unit: None

Set this parameter through ADD PICH, query it through LST PICH.

50



MaccPage RepeatTimes



Content: This parameter defines the times of retransmission of paging messages. If

the times of retransmission exceeds the value of this parameter, retransmission stops.

Value range: 0~2


Physical unit: None

Set this parameter through SET DPUCFGDATA, query it through LST DPUCFGDATA.

51



The most important difference between idle mode and connected mode is whether UE has



RRC connection with UTRAN or not.

In idle mode, UE will be identified by IMSI, TMSI or PTMSI and so on.

In connected mode, UE will be identified by URNTI (UTRAN Radio Network Temporary

Identity), which is the ID of one RRC connection.

53



This process may happen in the following typical scenarios:



Attach and detach

LA update and RA update

Signaling connection for services

54



UE will transmit the preamble at the access time slot.



Access frame is composed of two 10ms radio frames, which is divided into 15 access time

slot, and 5120 chips for each slot.

The PRACH access slots, AICH access slots and their time offset are showed in the above

figure.

55



A RACH sub-channel defines a sub-set of the total set of uplink access slots. There are a



total of 12 RACH sub-channels.

Set Preamble signatures and RACH sub-channel no. through ADD PRACHBASIC, query them

through LST PRACH.

56



For Frequency Division Duplex (FDD) mode, the PRACH resources include access timeslots



and preamble signatures, which can be classified into several ASCs, so as to provide RACH

applications with different priorities.

The ASCs range from 0 to 7, and the quantity of ASCs is 8. "0" indicates the highest priority

and "7" indicates the lowest priority.

Set ASC of PRACH through ADD PRACHASC, modify it through MOD PRACHASC, and remove

it through RMV PRACHASC.

57



The access class number is stored in the SIM/USIM.



Access class 0~9 are allocated to all the users. And these 10 classes show the same priority.

Access class 11~15 are allocated to specific high priority users as follows. (The enumeration

is not meant as a priority sequence):

Access class 15: PLMN staff

Access class 14: users subscribing to emergency services

Access class 13: public organizations

Access class 12: users subscribing to security services

Access class 11: users responsible for PLMN management

Access Class 10 indicates whether or not network access for Emergency Calls is allowed for

UEs with access classes 0 to 9 or without an IMSI. For UEs with access classes 11 to 15,

Emergency Calls are not allowed if both "Access class 10" and the relevant Access Class (11

to 15) are barred. Otherwise, Emergency Calls are allowed.

58



Set the mapping between AC and ASC through ADD PRACHACTOASCMAP, modify it



through MOD PRACHACTOASCMAP, and remove it through RMV PRACHACTOASCMAP.

59



START

Choose a RACH sub-channel fromavailable ones

Get available signatures

Set Preamble Retrans Max

Set Preamble_Initial_Power

Send a preamble

Random Access Procedure



Check the corresponding AI

Change message part power byp-m based on preamble power

Set physical status to be RACH

message transmitted Set physical status to be Nackon AICH received

Choose a access slot again

Counter > 0 & Commanded

preamble power - maximum

allowed power <6 dB

Choose a signature andincrease preamble transmit power

Set physical status to be Nackon AICH received

Get negative AI

No AI

Report the physical status to MAC

END

Get positive AI

The counter of preamble retransmitsubtract by 1, Commanded preamble

power increased by Power Ramp Step

N

Y

Send the corresponding

message part

60



Random access procedure

1. Derive the available uplink access slots, in the next full access slot set, for the set

of available RACH sub-channels within the given ASC. Randomly select one access

slot among the ones previously determined. If there is no access slot available in the

selected set, randomly select one uplink access slot corresponding to the set of

available RACH sub-channels within the given ASC from the next access slot set. Therandom function shall be such that each of the allowed selections is chosen with

equal probability.

2. Randomly select a signature from the set of available signatures within the given

ASC.

3. Set the Preamble Retransmission Counter to Preamble_ Retrans_ Max .

4. Set the preamble transmission power and Commanded Preamble Power to

Preamble_Initial_Power .

5. Transmit a preamble using the selected uplink access slot, signature, and

preamble transmission power.

6. If no positive or negative acquisition indicator (AI ≠ +1 nor –1) corresponding tothe selected signature is detected in the downlink access slot corresponding to the

selected uplink access slot:

A: select the next available access slot in the set of available RACH sub-

channels within the given ASC;

B: select a signature;



Power by Power Ramp Step, whereas the maximum value of preamble

transmission power is equal to MaxallowedUlTxPower .

D: Decrease the Preamble Retransmission Counter by one. If the Preamble

Retransmission Counter > 0 and Commanded Preamble Power – maximum

allowed power < 6dB, then repeat from step 5. Otherwise exit the physical

random access procedure.

7. If a negative acquisition indicator corresponding to the selected signature is

detected in the downlink access slot corresponding to the selected uplink access slot,

exit the physical random access procedure.

8. If a positive acquisition indicator corresponding to the selected signature is

detected, UE transmits the random access message three or four uplink access slots

after the uplink access slot of the last transmitted preamble. After that, exit the

physical random access procedure.

61



When a UE needs network service, it first sets up RRC connection as follows:



The UE sends a RRC CONNECTION REQUEST message from the cell where it camps to

the RNC.

The RNC allocates related resources for the UE and sends an RRC CONNECTION

SETUP message to the UE.

The UE sends a RRC CONNECTION SETUP COMPLETE message to the RNC. The RRC

connection setup ends.

62



T300



Content: T300 is started when UE sends the RRC CONNECTION REQUEST message. It

is stopped when UE receives the RRC CONNECTION SETUP message. RRC

CONNECTION REQUEST will be resent upon the expiry of the timer if V300 is lower

than or equal to N300, else enter idle mode.

Value range: D100, D200, D400, D600, D800, D1000, D1200, D1400, D1600, D1800,

D2000, D3000, D4000, D6000, D8000

Physical value range: 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000,

3000, 4000, 6000, 8000

Physical unit: ms

Set this parameter through SET IDLEMODETIMER, query it through LST

IDLEMODETIMER.

N300

Content: Maximum number of retransmissions of the RRC CONNECTION REQUEST

message.

Value range: 0~7


Physical unit: None


IDLEMODETIMER.

63



T312



Content: T312 is started when UE starts to establish a DCH, and stopped when UE

detects consecutive N312 "in sync" indications from L1. It indicates physical channel

setup failure upon the expiry of the timer.

Value range: 1~15

Physical value range: 1~15s

Physical unit: s


IDLEMODETIMER.

N312

Content: Maximum number of successive "in sync" indications received from L1.

Value range: D1, D2, D4, D10, D20, D50, D100, D200, D400, D600, D800, D1000

Physical value range: 1, 2, 4, 10, 20, 50, 100, 200, 400, 600, 800, 1000

Physical unit: None


IDLEMODETIMER.

64



RrcCause



Content: This parameter specifies the cause of RRC connection establishment, that is, the value

of the Establishment cause IE in the RRC CONNECTION REQUEST message.

Value range: ORIGCONVCALLEST, ORIGSTREAMCALLEST, ORIGINTERCALLEST,

ORIGBKGCALLEST, ORIGSUBSTRAFFCALLEST, TERMCONVCALLEST, TERMSTREAMCALLEST,

TERMINTERCALLEST, TERMBKGCALLEST, EMERGCALLEST, INTERRATCELLRESELEST,INTERRATCELLCHGORDEREST, REGISTEST, DETACHEST, ORIGHIGHPRIORSIGEST,

ORIGLOWPRIORSIGEST, CALLREEST, TERMHIGHPRIORSIGEST, TERMLOWPRIORSIGEST,

TERMCAUSEUNKNOWN, MBMSCALLEST, DEFAULTEST

Set this parameter through SET RRCESTCAUSE, query it through LST RRCESTCAUSE.

SigChType

Content: This parameter specifies the channel type and bit rate for RRC connection

establishment.

Value range: FACH, DCH_3.4K_SIGNALLING, DCH_6.8K_SIGNALLING, DCH_13.6K_SIGNALLING,

DCH_27.2K_SIGNALLING

FACH: The RRC connection is set up on the common channel.

DCH_3.4K_SIGNALLING: The RRC connection is set up on the 3.4 kbit/s dedicated

channel.


channel.


channel.


channel.

Set this parameter through SET RRCESTCAUSE, query it through LST RRCESTCAUSE.

65



RrcCause SigChType EFachSwitch

ORIGCONVCALLEST DCH_13.6K_SIGNALLING OFF

ORIGSTREAMCALLEST DCH_13.6K_SIGNALLING OFF

ORIGINTERCALLEST DCH_13.6K_SIGNALLING OFF

ORIGBKGCALLEST DCH_13.6K_SIGNALLING OFF

ORIGSUBSTRAFFCALLEST DCH_13.6K_SIGNALLING OFF

TERMCONVCALLEST DCH_13.6K_SIGNALLING OFF

TERMSTREAMCALLEST DCH_13.6K_SIGNALLING OFF

TERMINTERCALLEST DCH_13.6K_SIGNALLING OFF

TERMBKGCALLEST DCH_13.6K_SIGNALLING OFF

EMERGCALLEST DCH_13.6K_SIGNALLING OFF

INTERRATCELLRESELEST DCH_3.4K_SIGNALLING OFF

INTERRATCELLCHGORDEREST DCH_3.4K_SIGNALLING OFF

REGISTEST DCH_13.6K_SIGNALLING OFF

DETACHEST FACH OFF

ORIGHIGHPRIORSIGEST DCH_13.6K_SIGNALLING OFF

ORIGLOWPRIORSIGEST FACH OFF

CALLREEST DCH_3.4K_SIGNALLING OFF



TERMHIGHPRIORSIGEST DCH_13.6K_SIGNALLING OFF

TERMLOWPRIORSIGEST FACH OFF

TERMCAUSEUNKNOWN FACH OFF

MBMSCALLEST DCH_3.4K_SIGNALLING OFF

DEFAULTEST DCH_3.4K_SIGNALLING OFF

66

001 mtc owo113010 wcdma ue behaviors in idle mode issue1.02

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