1 Owo114010 Wcdma Ran12 Ue Behaviors in Idle Mode Issue1.01

WCDMA UE Behaviors in Idle Mode

Confidential Information of Huawei. No Spreading Without Permission

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PLMN selection

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.



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P-7

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

The second occasion is very common.



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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.



P-9

Equivalent PLMNs : The Mobile Equipment stores a list of "equivalent PLMNs". This list is

replaced at the end of each location update procedure or routing area update procedure.

The stored list consists of a list of equivalent PLMNs as downloaded by the network plus the PLMN code of the registered PLMN that downloaded the list.



P-10

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 PLMN Selector with Access Technology” data filed in the SIM excluding the previously selected PLMN

The PLMNs are arranged in priority order

3 PLMNs contained in the “Operator Controlled PLMN Selector with Access Technology” data filed in the SIM excluding the previously selected PLMN


4 Other PLMN/Access technology combinations with the high 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



P-11

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.



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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.



P-14

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.



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The typical scenarios when the UE read system include the followings :

Before cell selection

After cell reselection

Before location/route update

When the UE enter idle mode from connected mode

……



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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

shall select 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".



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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.



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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

Squal Cell selection quality value (dB)

Srxlev Cell selection RX level value (dBm)

Qqualmeas Measured cell quality value. The quality of the received signal indicated in

average CPICH Ec/No (dB) for current cell

Qrxlevmeas Measured cell RX level value. This RX level of the received signal indicated

CPICH RSCP (dBm) for current cell

Qqualmin Minimum required quality level in the cell (dB)

Qrxlevmin Minimum required RX level in the cell (dBm)

Pcompensation 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)



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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 UCELLSELRESEL, query it through LST UCELLSELRESEL, and modify it through MOD UCELLSELRESEL.

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

Set this parameter through ADD UCELLSELRESEL, query it through LST UCELLSELRESEL, and modify it through MOD UCELLSELRESEL.



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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

Set this parameter through ADD UCELLSELRESEL, query it through LST

UCELLSELRESEL, and modify it through MOD UCELLSELRESEL.



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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

Squal Cell quality value (dB)

Qqualmin Minimum required quality level in the cell (dB)

Sintrasearch Measurement threshold for UE to trigger intra-frequency cell reselection

Sintersearch Measurement threshold for UE to trigger inter-frequency cell reselection

SsearchRATm Measurement threshold for UE to trigger inter-RAT cell reselection



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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.



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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.



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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 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





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IdleSintersearch

Content: A threshold for inter-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 inter-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



ConnSintersearch

Content: A threshold for inter-frequency cell reselection in connect 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 inter-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





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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





P-30

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.



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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 for Qhysts to calculate Rs.



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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.



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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





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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





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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



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





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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 UINTRAFREQNCELL / ADD UINTERFREQNCELL,

query it through LST UINTRAFREQNCELL / LST UINTERFREQNCELL, and modify it through MOD UINTRAFREQNCELL / MOD UINTERFREQNCELL.

ConnQoffset1sn

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

reselection when the UE is in connected mode.



Physical unit: dB





P-37

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.



Physical unit: dB





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P-39

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.

CS domain location registration signaling is shown as following :

UE

Initial Direct Transfer

(location update request) Initial UE Message

(location update request)

Direct Transfer

(location update accept) Downlink Direct Transfer

(location update accept)

RNC CN


(IMSI detach indication)

。

。

。

。 Initial UE Message

(IMSI detach indication)

Normal Location Updating

Periodic Updating

IMSI Attach



P-40

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 NAS messages ATTACH ACCEPT and ROUTING AREA UPDATE ACCEPT. The value of T3312 shall be unique within an RA.

T3312 signaling procedure is shown as following :

T3312 is sent to UE in the two following scenarios.

UE


(routing area update request) Initial UE Message

(routing area update request)

Direct Transfer

(routing area update accept) Downlink Direct Transfer

(routing area update accept)

RNC CN

UE RNC CN


(attach request) Initial UE Message

(attach request)

Direct Transfer

(attach accept) Downlink Direct Transfer

(attach accept)

periodic RA update timer

periodic RA update timer

RA Updating

Periodic Updating



P-41

If the UE still stays in the same LA 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.



P-42

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 UCNDOMAIN, query it through LST UCNDOMAIN,

modify it through MOD UCNDOMAIN.

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


modify it through MOD UCNDOMAIN.



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P-44

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.



P-45

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.



P-46

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 paged UE on DCCH channel.



P-47

Paging Reception Process : When UE stays in idle mode, CELL_PCH or URA_PCH state, the

UE receives paging indicator from the PICH firstly, then reads the paging information on

the S-CCPCH.

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.



P-48

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 (DRX cycle length) + n * (DRX cycle length).

Paging Occasion(CELL SFN) Case :

One UE’s IMSI = 460010912121001, DRX cycle length = 64 frames, the value of

the paging occasion for the UE is shown as the red point in the above figure, in

these paging occasion(CELL SFN), the UE will read paging indicator from PICH



P-49

SFN is the paging occasion of the UE

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

indicated by the red dots, and then decodes the qth PI of this frame.

。。。

0

2^K-1

0 4095

。。。

P I P I P I P I。。。。。。

0 1 q NP-1

One DRX cycle



P-50

The timing relationship between PICH and SCCPCH is defined by the above figure, and the interval is 3 slots duration (2ms, 7680 chips).



P-51

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


and modify it through MOD UCNDOMAIN.

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 UPICH, query it through LST UPICH.



P-52

MaccPageRepeatTimes

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

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

stops. For details, refer to the 3GPP TS 25.331 protocol.

Value range: 0~2


Physical unit: None

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



P-53



P-54

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.



P-55

This process may happen in the following typical scenarios:

Attach and detach

LA update and RA update

Signaling connection for services



P-56

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.



P-57

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 UPRACHBASIC, query

them through LST UPRACH.



P-58

If UE1 can use all sub channels(0 ~ 11).

If UE2 can only use sub channels (0~2).

p-p: time interval between two PRACH preambles.



P-59

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 UPRACHASC, modify it through MOD UPRACHASC, and

remove it through RMV UPRACHASC.



P-60

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.



P-61

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

through MOD UPRACHACTOASCMAP, and remove it through RMV

UPRACHACTOASCMAP.



P-62

START

Choose a RACH sub-channel from

available ones

Get available signatures

Set Preamble Retrans Max

Set Preamble_Initial_Power

Send a preamble

Check the corresponding AI

Change message part power by

p-m based on preamble power

Set physical status to be RACH

message transmitted Set physical status to be Nack on AICH received

Choose a access slot again

Counter > 0 & Commanded

preamble power - maximum

allowed power <6 dB

Choose a signature and increase preamble transmit power

Set physical status to be Nack

on AICH received

Get negative AI

No AI

Report the physical status to MAC

END

Get positive AI

The counter of preamble retransmit

subtract by 1, Commanded preamble

power increased by Power Ramp Step

N

Y

Send the corresponding

message part

Random Access Procedure



P-63

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.

The random 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 to

the 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;

C: increase the preamble transmission power and Commanded Preamble

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.



P-64

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.



P-65

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 UIDLEMODETIMER, query it through LST UIDLEMODETIMER.

N300

Content: Maximum number of retransmissions of the RRC CONNECTION

REQUEST message.

Value range: 0~7


Physical unit: None

Set this parameter through SET UIDLEMODETIMER, query it through LST

UIDLEMODETIMER.



P-66



P-67

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 URRCESTCAUSE, query it through LST URRCESTCAUSE.



P-68

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.

DCH_6.8K_SIGNALLING: The RRC connection is set up on the 6.8 kbit/s

dedicated channel.

DCH_13.6K_SIGNALLING: The RRC connection is set up on the 13.6 kbit/s

dedicated channel.

DCH_27.2K_SIGNALLING: The RRC connection is set up on the 27.2 kbit/s dedicated channel.

Set this parameter through SET URRCESTCAUSE, query it through LST

URRCESTCAUSE.



P-69

RrcCause SigChType

ORIGCONVCALLEST DCH_13.6K_SIGNALLING

ORIGSTREAMCALLEST DCH_13.6K_SIGNALLING

ORIGINTERCALLEST DCH_13.6K_SIGNALLING

ORIGBKGCALLEST DCH_13.6K_SIGNALLING

ORIGSUBSTRAFFCALLEST DCH_13.6K_SIGNALLING

TERMCONVCALLEST DCH_13.6K_SIGNALLING

TERMSTREAMCALLEST DCH_13.6K_SIGNALLING

TERMINTERCALLEST DCH_13.6K_SIGNALLING

TERMBKGCALLEST DCH_13.6K_SIGNALLING

EMERGCALLEST DCH_13.6K_SIGNALLING

INTERRATCELLRESELEST DCH_3.4K_SIGNALLING

INTERRATCELLCHGORDEREST DCH_3.4K_SIGNALLING

REGISTEST DCH_13.6K_SIGNALLING

DETACHEST FACH

ORIGHIGHPRIORSIGEST DCH_13.6K_SIGNALLING

ORIGLOWPRIORSIGEST FACH

CALLREEST DCH_3.4K_SIGNALLING

TERMHIGHPRIORSIGEST DCH_13.6K_SIGNALLING

TERMLOWPRIORSIGEST FACH

TERMCAUSEUNKNOWN FACH

MBMSCALLEST DCH_3.4K_SIGNALLING

DEFAULTEST DCH_3.4K_SIGNALLING



P-70

1 Owo114010 Wcdma Ran12 Ue Behaviors in Idle Mode Issue1.01

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Transcript of 1 Owo114010 Wcdma Ran12 Ue Behaviors in Idle Mode Issue1.01