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Huawei Technologies Co. Ltd.

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V100R001 For internal useonly

Product Name: WCDMA RNP Total pages: 83

WCDMA RNO Access Procedure

Analysis GuidanceFor internal use only

Prepared by URNP-SANA Date 2003-05-24

Reviewed by Date

Reviewed by Date

Approved by Date

Huawei Technologies Co., Ltd.

All rights reserved


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WCDMA RNO Access Procedure Analysis Guidance For internal use only

13-3-24 All rights reserved Page 2 , Total 83

Revision Record

Date Revision

Version

Description Author

2003-05-24 1.00 Initial issued Chen Qi

2003-06-03 1.00 Revision based on the review comments Chen Qi

2004-11-01 2.00 Change the version, no content updated. Qinyan


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Table of Contents1 Access Procedure ....................................................................................................................................... 7

1.1 Cell Search ............................................................................................................................................ 71.1.1 Step 1: Slot Synchronization .................................................................................................... 71.1.2 Step 2: Frame Synchronization and Scrambling Code Group Identification ........................... 71.1.3 Step 3: Cell Primary Scrambling Code Identification .............................................................. 8

1.2 Cell Selection and Cell Reselection ...................................................................................................... 8

1.2.1 Cell Selection ........................................................................................................................... 81.2.1.1 Triggering occasions:.................................................................................................. 81.2.1.2 PLMN selection............................................................................................................ 81.2.1.3 Determing Criteria (S criteria).................................................................................... 9

1.2.2 Cell Reselection ...................................................................................................................... 111.2.2.1 Triggering occasions................................................................................................. 111.2.2.2 Measurement rules ................................................................................................... 111.2.2.3 Judging criteria (H criteria and R criteria) .............................................................. 13

1.3 Random Access ................................................................................................................................... 16

1.3.1 Random Access Channel ........................................................................................................ 171.3.2 Random Access Procedure ..................................................................................................... 19

2 Signalling Messages of Access Procedure ............................................................................................... 222.1 System Information Broadcast ............................................................................................................ 22

2.1.1 System Information Structure................................................................................................. 222.1.2 System Information Broadcast Procedure .............................................................................. 242.1.3 System Information Update .................................................................................................... 262.1.4 Description of IEs of SIBs ...................................................................................................... 28

2.1.4.1 MIB: ............................................................................................................................. 282.1.4.2 SIB1:............................................................................................................................ 282.1.4.3 SIB2:............................................................................................................................ 30

2.1.4.4 SIB3:............................................................................................................................ 302.1.4.5 SIB5:............................................................................................................................ 322.1.4.6 SIB7:............................................................................................................................ 332.1.4.7 SIB11: ......................................................................................................................... 332.1.4.8 SIB18: ......................................................................................................................... 33

2.2 RRC Connection ................................................................................................................................. 33

2.2.1 RRC_CONNECTION_REQUEST ........................................................................................ 342.2.2 RRC_CONNECTION_SETUP & RRC_CONNECTION_SETUP_COMPLETE ................ 35

2.2.2.1 UE in the CELL_FACH state after the RRC connection setup........................... 362.2.2.2 UE in CELL_DCH state after RRC connection setup .......................................... 39

3 Access Procedure Performance Analysis ................................................................................................. 433.1 Performance Indices of Access Procedure .......................................................................................... 43

3.2 Relevant Factors Affecting Access Procedure Performance ............................................................... 443.2.1 Incorrect Setting of Tcell Affecting Cell Searching Speed ...................................................... 443.2.2 Unreasonable Neighboring cell List Affecting Cell Selection ............................................... 443.2.3 Doppler Frequency Shift Affecting Access Performance of UE ............................................ 443.2.4 Traffic Distribution in Cell Effect on Acquisition Probability ............................................... 453.2.5 Different Clutters Affecting Open Loop Power Control ........................................................ 45

4 Analysis Procedure for Access Procedure ............................................................................................... 46

4.1 Step 1: Knowing System Performance ................................................................................................ 46

4.2 Step 2: Ensuring a Stable System ........................................................................................................ 464.3 Step 3: Determining Neighboring cell Distribution ............................................................................ 46

4.4 Step 4: Executing Pilot Auditing ......................................................................................................... 474.5 Step 5: Updating Neighboring cell List ............................................................................................... 47

4.6 Step 6: Drive Test ................................................................................................................................ 474.7 Step 7: Drive test Result Analysis ....................................................................................................... 47

4.7.1 Analysis Method..................................................................................................................... 47


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4.7.2 Parameters to be Analyzed and Adjusted in the Access Procedure ........................................ 485 Analysis of Problems in Access Procedure .............................................................................................. 48

5.1 UE Failing in Cell Search .................................................................................................................... 485.2 UE Failing in Cell Access or Receiving RRC Connection Rejection ................................................. 48

5.3 RNC Failing in Receiving the RRC_CONNECTION_REQ Message Transmitted by UE ................ 48

5.4 UE Failing in Receiving the RRC_CONNECTION_SETUP Message Transmitted by RNC ............ 495.5 UE Failing in Receiving ACK Message Indicating RRC Connection Completion ............................ 49


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List of Tables

Table 1 S criteria parameter description .................................................................................................... 9

Table 2 Cell reselection parameter description......................................................................................... 15Table 3 Description of the parameters of cell reselection in system information broadcasts .......................... 15Table 4 Relation between access subchannel and access slot and SFN ..................................................... 21Table 5 System information block ........................................................................................................... 23Table 6 Parameters to be analyzed and adjusted in the access procedure .................................................. 49

List of PicturesFigure 1 Number of RACH access slots and interval between them............................................................. 17Figure 2 Structure of random access transmission..................................................................................... 18Figure 3 PRACH-AICH timing relation from the view of UE ......................................................................... 19

Figure 4 Definition of access slot set (with the example of uplink/downlink access slot fixed difference p-a7680chips) 22

Figure 5 System information structure ...................................................................................................... 23Figure 6 RRC signalling connection setup process .................................................................................... 33Figure 7 RRC CONNECT REQUEST ....................................................................................................... 35Figure 8 RRC CONNECT SETUP (DCCH is mapped on common channel) ................................................. 36Figure 9 MappingInfo of SRB1 and SRB2 of the DCCH mapped to the common channel .............................. 38Figure 10 RRC CONNECT SETUP COMPLETE (DCCH is mapped on the common channel .......................... 39Figure 11 RRC CONNECT SETUP (DCCH is mapped to the dedicated channel ............................................ 40Figure 12 MapingInfo of SRB1 and SRB2 of the DCCH mapped to the DCH .................................................. 42Figure 13 RRC CONNECT SETUP COMPLETE (DCCH is mapped to the DCH)............................................ 42


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WCDMA RNO Access Procedure Analysis Guidance

Key words:Access procedure, cell search, cell selection and reselection, random access

Abstract: This document analyzes in detail the whole access procedure from the view of access

stratum (AS), discusses access performance indices and influence factors, and

presents the analysis process of access procedure in the actual network planning and

the solutions to the possible problems in the access.

Acronym list: Omitted.


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1 Access Procedure

UE can run in one of these two basic modes: idle mode and connected mode. After the UE is

powered on, it keeps in idle mode and is differentiated through non AS identities, such as IMSI,

TMSI or P-TMSI. The UTRAN does not store the information of the UE in idle mode, but it can

page all UEs which are powered on and camp on the cell one by one, or page all the UEs in idle

mode in an RNC at the same time. Only after the UE finishes the RRC connection setup will it

enter to connected mode (CELL_FACH or CELL_DCH state) from idle mode. When the RRC

connection is released, it will enter idle mode from connected mode.

Viewing from the AS, access procedure is the procedure of a transition from idle mode to

connected mode of the UE. It includes four basic procedures: cell search, cell system information

broadcast receiving, cell selection and reselection, and random access. Once the UE enters

connected mode, it can carry out such non AS activities as PLMN selection and reselection,

location registration, service application and authentication. This document summarizes all the

steps in the UE access procedure, analyzes the signalling and performance of the whole access

procedure, and discusses the analysis methods for the access procedure and the solutions to the

problems in the drive test based on the analysis.

1.1 Cell Search

UE will search cell according to one of the following procedure:

UE is independent of the information of the RF channel of UTRA carrier frequency. In this

case, UE will scan all frequencies in all UTRA bands to locate a suitable cell to camp on in the

selected PLMN. In each carrier frequency, UE only needs to search the best serving cell.

UE has the stored UTRA carrier frequency information and cell parameter information which

obtained from measurement control information received before, such as primary scrambling

code of cell. In this case, UE will attempt to camp on this cell directly. If it fails, it can only scan all

frequencies in all UTRA bands to locate a suitable cell in the selected PLMN.

The procedure of carrying out cell search is as follows (Of course, a frequency locked first):

1.1.1 Step 1: Slot Synchronization

All primary SCH synchronization codes in the UTRAN are identical and are transmitted in the

former 256 chips of each slot. The synchronization codes of each slot are the same. The UE can

achieve slot synchronization easily by using a matched filter or the similar technology.

1.1.2 Step 2: Frame Synchronization and Scrambling Code Group Identification

Frame synchronization is realized by means of secondary SCH synchronization. There are

16 secondary SCH synchronization codes in all, which are different in each slot. They form 64


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groups of code sequences according to different code words in each slot. The 64 groups of code

sequences feature that the result after any cyclic shift is unique. The UE can perform SSC

correlation calculation, FWHT and RS decoding to determine the cell scrambling group and

achieve frame synchronization.

1.1.3 Step 3: Cell Primary Scrambling Code Identification

In the above step the UE got the scrambling code group which contains 8 primary scrambling

codes of the local cell. Then the UE performs correlation calculation based on symbol until it finds

the one with the biggest correlation value, so as to determine the primary scrambling code. After

getting this code word, the UE can read the information of the broadcast channel since both

CPICH and PCCPCH use this scrambling code and their channelization codes are fixed.

1.2 Cell Selection and Cell Reselection

Once the UE is powered on, it will determine whether the current PLMN is suitable or not

according to the system information after it finds a cell. If the PLMN is suitable, it performs cell

measurement and determines whether the current cell is suitable to camp on according to the S

criteria, this is the cell selection procedure. If the current cell cannot meet the S criteria, it will start

the procedure of PLMN selection and cell reselection (It carries out cell reselection in the current

PLMN first. In case of no suitable cell, it carries out PLMN search and goes to another PLMN for

cell reselection and cell selection), and then performs the adjacent cell measurement. Thereafter,

it sequences the cells under measurement according to the R criteria or H criteria, and it then cancamp on the one meeting the S criteria. Of course, cell selection and reselection are not always

carried out during power-on. This procedure will be triggered by other reasons.

1.2.1 Cell Selection

This section introduces the triggering occasions and cell selection procedure, as well as the

criteria for determining Suitable Cell.

1.2.1.1 Triggering occasions:

The UE initiates cell selection in the following cases:

UE power-on

Returning to idle mode from connected mode

cell information lost in connected mode

Failure in finding cell to camp on normally in the cell reselection based on the cell list

provided in the measurement control system information (TS25.133)

1.2.1.2 PLMN selection


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If the UE has obtained the PCCPCH scrambling code from step 3 in Section 1.1, and the

PCCPCH channelization code (SF (ch,256,1)) is known, which is unique in the whole UTRAN, the

UE can read the information of the broadcast channel.

The MIB scheduling information is known, that is, SIB_POS=0 and SIB_REP =8. The UE canread MIB in the radio frame of the SFN in the value range of (0,8,16, ....). How does UE acquire

SFN? If the SYSTEM INFORMATION message is transmitted on BCH (PCCPCH), the first field of

this message is SFNprime whose value is the initial SFN corresponding to this transport block.

The value range is (0, 2, 4, 6, ..., 4094), but it is (0..2047) after the PER encoding. In this case,

one bit can be saved. Why are the SFN values 0, 2, 4, ...? Because the BCH TTI is 20ms,

including two radio frames. Therefore the step length of the SFNprime field can be 2 only.

After reading MIB, the UE can determine whether the current PLMN is the one wanted,

because the MIB contains the PLMN identity field. If this is the case, the UE will find other SIBsand acquire their contents according to the schedulding information of other SIBs in the MIB.

Otherwise, the UE must find another frequency and start this procedure from the beginning,

namely, cell search.

1.2.1.3 Determing Criteria (S criteria)

If the current PLMN is the one wanted, the UE will read SIB3 to acquire Cell selection and

re-selection info, and read Qqualmin, Qrxlevmin and Maximum allowed UL TX power

(UE_TXPWR_MAX_RACH) in the IE of Cell selection and re-selection info for SIB3/4, and

then determine whether the current cell is suitable to camp on according to S criteria.

S criteria:

Srxlev > 0 AND Squal > 0

Where:

Squal = Qqualmeas Qqualmin

Srxlev = Qrxlevmeas

- Qrxlevmin - Pcompensation

Table 1S criteria parameter description

Parameters Description

Squal It is the quality evaluation value for cell selection, in dBs. It is not suitable for

the TDD and GSM mode. Squal is only used for the FDD cell with the CPICH

Ec/Io as the measurement value.

Srxlev It is the cell selection RX level value, in the unit of dBm.

Qqualmeas It is the cell quality measurement value. The quality of the received signal is

represented by CPICH Ec/Io. This parameter is used for the FDD mode only.

Qrxlevmeas It is the measurement value of cell receiving level, in the unit of dBm. This

parameter is suitable for CPICH RSCP of the FDD cell, the P-CCPCH RSCP


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in the TDD cell and the TXLEV of GSM.

Qqualmin It refers to the minimum quality requirement for cell, in dBs. It is not suitable

for TDD or GSM.

Qrxlevmin It refers to the minimum requirement for cell receiving level, in the unit of

dBm.

Pcompensation It is the max value of (UE_TXPWR_MAX_RACH P_MAX, 0), in the unit of

dBm.

UE_TXPWR_MAX_RACH It refers to the maximum transmit power of the UE in the RACH of the cell, in

the unit of dBm.

P_MAX It refers to the maximum output power of the UE, indicating the capability of

the UE, in the unit of dBm.

If a cell meets the S criteria, the UE will take this cell as a suitable cell and camp on it, and

then read other system information required. Hereafter, the UE initiates the location registration

procedure.

If the cell does not meet the S criteria, the UE will read SIB11, Measurement control system

information, Intra-frequency measurement system information, Intra-frequency cell info list, cell

info, Primary CPICH info, Reference time difference to cell and Cell Selection and Re-selection

info for SIB11/12. In CPICH info, the UE can get the primary scrambling code. Since the channel

code of CPICH is unique in the whole UTRAN, the UE can measure Qqualmeasand Qrxlevmeas ofthe

adjacent cell easily (but it requires slot synchronization and frame synchronization) based on the

primary scrambling code and the reference time difference to cell. Moreover, in the IE of Cell

Selection and Re-selection info for SIB11/12, the UE can know the Maximum allowed UL TX

power, Qqualmin and Qrxlevmin of the adjacent cell, so that it can calculate the Squal and

Srxlev of the adjacent cell to determine whether the adjacent cell meets the above selection

criteria or not.

The UE can also read Inter-frequency measurement system information, Inter-frequency cell

info list, frequency info and cell info, and the Cell info is the same as above. The Frequency info

contains UARFCN uplink (Nu) and UARFCN downlink (Nd). Based on all the above information,

the UE can work out Squal and Srxlev of the adjacent cell and determine whether it meets the S

criteria or not.

If the UE cannot find any cell meeting the S criteria, it will consider there is no coverage and

go on with the PLMN selection and reselection procedure.

In idle mode, the UE needs to monitor the signal quality of the current cell and adjacent cell

all the time to select the best serving cell to acquire the service. This is the cell reselection

procedure.

If the UE finds an adjacent cell meeting the selection criteria, it will camp on this cell and read

other system information required. Then the UE will start the random access and initiate the

location registration procedure.


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1.2.2 Cell Reselection

The UE will fulfill the following tasks when it is in normal residence state in the UTRAN:

Monitoring PCH and PICH according to indication of system information;

Monitoring relevant system information;

Carrying out cell measurement procedure to provide data for the cell reselection evaluation

procedure;

The following is the introduction to the triggering occasions and measurement rules of cell

reselection, as well as the criteria for cell reselection evaluation.

1.2.2.1 Triggering occasions

The UE initiates cell reselection in the following cases:

Time triggering in idle mode (with the quality measurement value of the current service cell

being smaller than intra-frequency measurement threshold)

When the UE in idle mode cannot find any service cell meeting the S criteria within Nserv

DRXs (in spite of the setting in system information)

When the UE detects that it is in a non-service area

1.2.2.2 Measurement rules

Measurement rules for non Hierarchical Cell Structure (HCS) cells

If the cell broadcast system information indicates that the HCS is not adopted, the UE

decides to perform the corresponding measurement according to the following rules: (Note: in the

CPICH Ec/Io measurement status, Squal corresponds to Sx, in the CPICH RSCP measurement

status, Srxlev corresponds to Sx)

Intra-frequency measurement

If Sx>Sintrasearch, UE does not need to perform intra-frequency measurement.

If SxSintrasearch, UE does not need to perform inter-frequency measurement.

If Sx


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If system information does not contain Sintrasearch, UE need to perform inter-frequency

measurement in all cases.

Inter-system measurement

If Sx>SsearchRATm, UE does not need to measure system m.

If Sx


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IF (Srxlevs


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Rs = Qmeas,s + Qhysts

Rn = Qmeas,n - Qoffsets,n - TOn * (1 Ln)

Where:

TOn = TEMP_OFFSETn * W(PENALTY_TIMEn Tn)

Ln = 0 if HCS_PRIOn = HCS_PRIOsLn = 1 if HCS_PRIOn HCS_PRIOs

W(x) = 0 for x < 0

W(x) = 1 for x >= 0

The parameterTEMP_OFFSETn, defined for the H criteria and R criteria, is the offset of the

adjacent cells within the PENALTY_TIMEn. The two parameters of TEMP_OFFSETn and

PENALTY_TIMEn are suitable for the HCS cells only (which are designated in the system

information).

Each adjacent cell is assigned with a timer Tn, which will be reset when the following

conditions are met:

If HCS_PRIOn HCS_PRIO and Qmeas_LEV,n > Qhcsn

Or

If HCS_PRIOn = HCS_PRIO and

if the measurement value is set to CPICH RSCP for the FDD cell and the adjacent cells,

Qmap,n > Qmap,s + Qoffset1s,n

if the measurement value is set to CPICH Ec/No for the FDD cell and the adjacent cell

Qmeas_LEV,n > Qmeas_LEV,s + Qoffset2s,n

for other types of cells:

Qmap,n > Qmap,s + Qoffset1s,n

If the above conditions are not met, Tn should stop counting immediately. TQn is valid only

when Tn is counting; otherwise, it should be set to 0.

The cell reselection procedure and Tn are still valid after the UE selects a new cell, unless the

above conditions are not met or the cell is not the adjacent cell of the selected cell any more.

However, the system information of the new system after the new cell is selected should be used

to evaluate the above criteria.


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Table 2Cell reselection parameter description


Sn The cell selection value of adjacent cells (db)

Qmap,s It is the quality mapping value of the service cell, including the CPICH RSCP

and CPICH Ec/No in the FDD mode, CPICH P-CCPCH RSCP in the TDD

mode and the RXLEV of the GSM. The parameters of the mapping functions

are provided by the cell_selection_and_cell_quality_measure section of the

system information.

Qmap,n It is the quality mapping value of the service cell, including the CPICH RSCP

and CPICH Ec/No in the FDD mode, CPICH P-CCPCH RSCP in the TDD

mode and the RXLEV of the GSM. The parameters of the mapping functions

are provided by the cell_selection_and_cell_quality_measure section of the

system information.

Qmeas_lev It is the quality value of the signal received provided in the

cell_selection_and_cell_quality_measure section of the system information.

It is represented by in CPICH RSCP the FDD mode, and P-CCPCH RSCP in

the TDD mode and RXLEV in the GSM.

The UE sequences these cells meeting the S criteria according to the R criteria:

The cells with the highest HCS_PRIO meeting the H criteria, that is, H is greater than or

equal to 0. This is not for the case when the UE is in the fast moving mode.

If HCS is not considered, or no cell meets the H criteria, the UE will sequence all cells.

In all the cases, a cell will be selected only when it meets all the criteria above within the time

ofTreselect.

Table 3Description of the parameters of cell reselection in system information broadcasts


Qoffset1s,n It is the offset between two cells, used for the CPICH RSCP in the TDD, GSM

and FDD mode.

Qoffset2s,n It is the offset between two cells, used for the CPICH Ec/No in the TDD, GSM

and FDD mode.

Qhyst1s It is the hysteresis value, used for the CPICH RSCP in the TDD, GSM and

FDD mode.

Qhyst2 It is the hysteresis value, used for the CPICH Ec/No in the TDD, GSM and

FDD mode.

HCS_PRIOs, HCS_PRIO It is the priority assigned to service cell and adjacent cell, in the value range of

(0-7).

Qhcss, Qhcsn It is the quality threshold of the service cell and adjacent cell in the cell


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reselection in HCS.

Qqualmin It is the minimum quality standard designated to the cell, in the unit of db. It is

used for CPICH Ec/No of FDD only.

Qrxlevmin It is the minimum receiving level, in the unit of dBm, TEMPORARY_OFFSET1n

PENALTY_TIMEn It refers the time duration for which the TEMPORARY_OFFSETn is applied for

a neighbouring cell.

TEMPORARY_OFFSET1n It is the offset of applying the H and R criteria within the penaltiy time, used for

the CPICH RSCP in the TDD, GSM and FDD mode.

TEMPORARY_OFFSET2n It is the offset of applying the H and R criteria within the penalty time, used for

the CPICH Ec/No in the FDD mode.

TCRmax It indicates the maximum time spent for cell reselection.

NCR It is the maximum times of cell reselection

TCRmaxHyst It refers to the hysteresis time for the UE resumes to the normal mode from the

high-speed moving mode.

Treselections It indicates the value of the cell reselection counter (for designating the

hysteresis time for cell reselection)

SsearchHCS It specifies the threshold for the UE to perform measurement on the adjacent

cell when HCS is adopted.

SsearchRAT 1 - SsearchRAT k It specifies the threshold for the startup of the measurement on the system

RATm.

SHCS,RATm It specifies the threshold for the UE to perform inter-system measurement on

the adjacent cell when HCS is adopted.

Sintrasearch It specifies the threshold for intra-frequency measurement. It is used in the

HCS measurement criteria.

Sintersearch It specifies the threshold for inter-frequency measurement. It is used in the

HCS measurement criteria.

Slimit,SearchRATm It indicates the measurement criteria for cell reselection in HCS. It is used to

designate the time when the UE starts up the inter-system measurement

(RATm) on the adjacent cell.

1.3 Random Access

Random access procedure is the procedure when an MS requests access to the system,

receives the response of the system and is allocated with dedicated channel. (Note: If the RRC

connection is set up on the common control channel (CCCH), the system does not need to

allocate DCCH. If the RRC connection is set up on the dedicated control channel (DCCH), the

system needs to allocate DCCH). This procedure is attached once the MS is powered on, and will

be detached when the MS is powered off, location area update, routing area update, and

signalling connection setup process for executing any service. The 3GPP 25.211 protocol defines


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the random access channel (RACH) and physical random access channel (PRACH), as well as

the frame structure of the access channel and physical-layer timing relation. The 3GPP 25.213

defines the spread spectrum demodulation of the domudulation and message parts (data and

control) of the access channel preamble code, as well as the preamble code, scrambling code

and spread code. The 3GPP 25.214 protocol defines the access procedure. The following are the

further description of these contents.

1.3.1 Random Access Channel

RACH, an uplink common transport channel, maps to PRACH, which is an uplink physical

common channel. RACH is always received by NodeB in the whole cell. It features collision and

adopting open loop power control.

The RACH transmission is based on a Slotted ALOHA approach with fast acquisition

indication (AI). The MS can start the transmission at a pre-defined time offset, which is

represented by an access slot. Two 10-ms radio frames constitute a 20ms access frame, which

are divided into 15 access slots, with an interval of 5120 chips (with the time of 1.332ms). Figure 1

shows the timing information and AI on the access slot, as well as the number of access slots and

the interval between them. The high-layer signalling indicates the access slot whose information

is available in the current cell.

Figure 1Number of RACH access slots and interval between them

The user can initiate random access transmission at the start time of each access slot. Figure

2 shows the structure of the random access transmission, which is composed of one or more

message parts of 10ms or 20ms in length.

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

5120 chips

radio frame: 10 ms radio frame: 10 ms

Access slot

Random Access Transmission





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Figure 2Structure of random access transmission

The preamble of the random access is 4096 chips, including 256 repetitions of a 16-chip

signature. There are 16 different signatures in all.

The 10-ms message of random access is divided into 15 slots, each of which is 2560 chips in

length. Each slot includes two parts, one is data part, which the RACH transport channel maps to;

the other is the control part, which is used to transport the L1 control information. The data and

control parts are transmitted simultaneously in code multiplexing mode. A 10-ms message part is

composed of one radio frame, and a 20-ms message part is composed of two continuous 10-ms

radio frames. The length of the message part can be determined by the signature and/or access

slot used. This is configured by the high layer.

The data part includes 10*2k

bits, where, k=0, 1, 2, 3. The data part of the message

corresponds to the spread factors of 256, 128, 64 and 32.

The control part includes eight known pilot bits (used for supporting the channel estimation

for correlation detection) and two TFCI bits. For the message control part, this corresponds to the

spread factor of 256. For the pilot bit pattern, refer to the 3GPP TS 25.211 protocol. The total

number of TFCI bits in the access message is 152, that is 30. The TFCI value corresponds to

the transport format of the current random access message. When the PRACH message part is

20ms in length, the TFCI will repeat in the second radio frame.

The downlink AICH is divided into downlink access slots, each of which is 5120 chips in

length. The downlink access slot is aligned with the PCCPCH in terms of time. The uplink PRACH

is divided into uplink access slots, each of which is 5120 chips. The nth uplink access slot are

transported the p-a chips before the UE receives the nth downlink access slot (where n=0,

1, 14). The downlink AI is transmitted at the beginning of the downlink access slot. Similarly, the

preamble and message part of the uplink RACH are transmitted at the beginning of the uplink

access slot. Figure 3 shows the PRACH/AICH timing relation.

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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Figure 3PRACH-AICH timing relation from the view of UE

The preamble-preamble code distance p-p should be greater than or equal to the minimum

preamble-preamble code distance p-p,min, that is p-pp-p,min.

The distance from the preamble to the AI p-a, and the distance from the preamble to the

message p-m are as shown below:

When AICH_Transmission_Timing is set to 0, then

p-p,min = 15360 chips (3 access slots)

p-a = 7680 chips

p-m = 15360 chips (3 access slots)

When AICH_Transmission_Timing is set to 1, then

p-p,min = 20480 chips (4 access slots)

p-a = 12800 chips

p-m = 20480 chips (4 access slots)

The parameterAICH_Transmission_Timing is provided through the signalling mode.

1.3.2 Random Access Procedure

After the physical layer of the UE receives the PHY-DATA-REQ primitive request of the MAC

sublayer, the UE will start the physical random access procedure. Refer to the 3GPP TS 25.321

protocol.

Before the physical random access procedure is initiated, the layer 1 (physical layer) of the

UE should be able to receive the following system information from the high layer of the UE (RRC

layer):

Scrambling code of the preamble part

Length of the message part, 10ms or 20ms

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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The value of AICH_Transmission Timing (0 or 1)

The signature set and RACH access subchannel group set assigned for the SN of each ASC

(access subchannel)

The parameter ofPower_Ramp_Step (integer > 0)

The parameter ofPreamble_Retrans_Max (integer > 0)

The parameter of Preamble_Initial_Power

The power used for the last preamble transmission and the offset of the transmission power

of the control part in the random access message P p-m = Pmessage-control Ppreamble, in the unit

of dB.

TFS parameters, including the power offset of the data part and control part of the random

access message for every transmission format.

Please note that the above parameters may be updated by the high layer before the physical

random access procedure is initiated every time.

In addition, before the physical random access procedure is initiated, layer 1 should be able

to receive the following information from the MAC layer:

The transmission format used for the PRACH message part

ASC transmitted by PRACH

Data to be transmitted (TBS)

When initiating the physical random access, the UE needs to operate according to the

following procedure:

Step 1: It determines the available RACH access subchannel set according to the

designated ASC and the available uplink access slot set in the next complete access slot set

(SFN mod 2 = 0 and SFN mod 2 = 1, where the former one is called access slot set 1, and the

latter one is called access slot set 2), and then selects one uplink access slot randomly. The rule

for random selection is equal probability selection. If no access slot set is available currently, it

selects one in the next access slot set at random.

Step 2: It selects the signature randomly from the signature set according to the designated

ASC. The rules for random selection are equal probability selection.

Step 3: It sets the initial value of the preamble retransmission counter to

Preamble_Retrans_Max .

Step 4: It sets the parameter Commanded Preamble Power to Preamble_Initial_Power.

Step 5: If the value ofCommanded Preamble Powerexceeds the largest allowed value, it

will set the transmission power of the preamble to the maximum allowed transmission power. If


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the value ofCommanded Preamble Poweris less than the minimum value required (specified in

the 3GPP TS 25.101 protocol), it will set the transmission power of the preamble to the current

calculation value (which may be greater than, less than or equal to the Commanded Preamble

Power). Otherwise, it sets the transmission power of preamble to Commanded Preamble Power.

It transmits the preamble by using the selected uplink access slot, signature and preamble

transmission power.

Step 6: It waits for the NodeB to return an acknowledgement for the used signature. If the UE

cannot detect the AI of +1 or -1 on the downlink access slot with the same number as the uplink

access slot used for transmitting preamble, it will select an available uplink access slot at random.

Then it adds Commanded Preamble Power according to the power ramp step P p-m =

Pmessage-control Ppreamble, and then subtract the preamble reset counter by 1. If Commanded

Preamble Poweris greater than the maximum power threshold 6dB, the UE will report the status

of layer 1 (No ack on AICH) to the MAC layer, and then exit the physical random access

procedure. Thereafter, if the value of the retransmission counter is greater than 0, repeat Step 6;

otherwise, report the status of layer 1 (No ack on AICH) to the MAC layer, and exit the physical

random access procedure

Step 7: If the received value of AI for UE is -1, it will report the status of layer 1 (No ack on

AICH) to the MAC layer, and then exit the physical random access procedure.

Step 8: If the received value of AI for UE is +1, it will transmit the random access message

part three or four uplink access slots after the last time of preamble transmission according to the

value ofAICH_Transmission_Timing. The transmission power of the control part of the random

access message should be P p-m higher than the power for the last preamble transmission. For

that of the data part, refer to the protocol.

From the view of the operation flow of the random access procedure, the UE needs to

transmit preamble before initiating an access, and then waits for the acknowledgement from

NodeB. Then the NodeB detects the preamble transmitted by the UE in each uplink slot. It will

return an AI through the AICH channel if it finds a preamble. The UE detects AI in a specific

downlink access slot after transmitting the preamble. If it receives a permission AI, it continues to

transmit the message part, so as to complete a physical random access. If it does not receive any

AI, the UE will repeat the handshake process of transmit preambledetect AI for N times (preset),

and start transmitting the message part, to complete a physical random access. If the UE receives

a rejection AI, it will exit this random access procedure, and then report the status. The message

of the random access message part includes the flag information of the UE, the service type

requested, and so on.

The following shows the access subchannels and the definitions of access slot sets, with the

following example:

Table 4Relation between access subchannel and access slot and SFN


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SFN modulo 8 of

corresponding P-CCPCH

frame

Subchannel number

0 1 2 3 4 5 6 7 8 9 10 11

0 0 1 2 3 4 5 6 7

1 12 13 14 8 9 10 112 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

AICH access

slots

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

Figure 4Definition of access slot set (with the example of uplink/downlink access slot fixed difference p-a 7680chips)

2 Signalling Messages of Access Procedure

Before the access procedure, the UE needs to receive the cell system information broadcast

message of the UTRAN. The following is the introduction to the meanings and applications of

these signalling messages and information elements (IE).

2.1 System Information Broadcast2.1.1 System Information Structure


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Figure 5System information structure

System IEs are broadcast in system information block (SIB). The system IEs with the same

character are combined to an SIB. Different SIBs may have different characters, for example, the

periodical repetition rate and the requirement on SIB re-read of the UE.

The system information is organized as a tree, as shown in Figure 5. As the reference of

large numbers of SIBs in a cell, the primary information block contains the sequence of these

SIBs. The upper level SIB functions the same on the blocks of the lower level. The referenced SIB

must have the same function range and update mechanism with the SIBs of the upper level.

Some SIBs may be present for several times with different contents. In this case, the

sequence for each present of the SIBs must be provided. At presently, this is only suitable for the

SIB type 16.

The following table shows the description of each system information block.

Table 5System information block

SIB RRC Protocol

State

Description Size

[TTI]

1 Idle mode Contains the NAS information and the information of the timers and

counters of the UE in idle mode and connected mode

1

2 Connected mode Contains the URA identity and the periodical cell updating and URA

updating information

1

3 Idle mode Contains the parameters of cell selection and reselection read by the UE

in idle mode

1

4 Connected mode Contains the parameters of cell selection and reselection read by the UE

in connected mode

(1)

5 Idle mode Contains the configuration parameters of the common channel read by

the UE in idle mode

3


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SIB RRC Protocol

State

Description Size

[TTI]

6 Connected mode Contains the configuration parameters of the common channel and

common physical channel read by the UE in connected mode

(3)

7 Idle mode

Connected mode

Contains the parameters of fast variance (UL-Interference and dynamic

persistence level)

0.5

8 Connected mode

(FDD only)

Contains the static CPCH information 1.5

9 Connected mode

(FDD only)

Contains the CPCH information 0.5

10 CELL_DCH

(FDD only)

Contains the Dynamic Resource Allocation Control (DRAC)

procedure information

-

11 Idle mode Contains the adjacent cell list and measurement control information read

by the UE in idle mode

1-10

12 Connected mode Contains the adjacent cell list and measurement control information read

by the UE in connected mode

(1-10)

13 Idle mode

Connected mode

Contains the ANSI-41 information 1

13-1 Idle mode

Connected mode

Contains the ANSI-41 RAND information 0.5

13-2 Idle mode

Connected mode

Contains ANSI-41 user zone ID 0.5

13-3 Idle mode

Connected mode

Contains the ANSI-41 private neighbour list 0.5

13-4 Idle mode

Connected mode

Contains ANSI-41 service redirect information 0.5

14 Idle mode

Connected mode

(TDD only)

Contains the uplink outloop function control information read by the UE in

the idle and connected mode

-

15 Idle mode

Connected mode

Contains the LCS information supported 1

16 Idle mode

Connected mode

Contains the RB used for handover and the parameters of the transport

channel and physical channel read and stored by the UE in the idle and

connected modes.

3

18 Idle mode

Connected mode

Contains the PLMN ID of the Neighboring cell

2.1.2 System Information Broadcast Procedure

According to the protocol, the system information message transmits the SIB on the BCCH,

and BCCH can be mapped to the BCH or FACH, so the size of the system information message

should be in accord with the size of the BCH or FACH. The RRC layer is responsible for the

cascading (when the size of the SIB is less than that of the transport block of the BCH or FACH)

and segmentation of the SIB (when the size of the SIB is greater than that of the transport block of


25/83



the BCH or FACH). The UE in the CELL_PCH/URA_PCH/CELL_FACH state reads the system

information on the BCH transport channel. If the UE is powered off, all the SIBs stored previously

will become invalid after the cell or PLMN reselection, and the UE should re-read and store them.

For the SIB with the value tag, the UE should update them according to Section 8.1.1.4.1 and

Section 8.1.1.4.2 in the 25.331 protocol; for the SIBs with expiration timer, the UE should update

them according to Section 8.1.1.4.2 of the 25.331 protocol. If the PAGING TYPE 1 message

received by the UE indicates system information change, the UE should re-read the system

information.

There is no reading when the UE is in the CELL_DCH state. The UTRAN instructs the UE in

the CELL_FACH state to read through the system information update indication, and instructs the

UE in the CELL_PCH state to read through paging.

The features of the BCH are: 1) It has downlink only; 2) the fixed rate is low; 3) it requires fullcell coverage. The broadcast on the BCH can use the system information on NodeB, and the

information is updated frequently (every 20 to 100ms, for example, the uplink interference value of

the cell). For the system information come from CRNC, the update frequency is much lower than

the broadcast repetition frequency on the BCH.

The PCCPCH is used to bear the BCH transport channel as a downlink physical channel,

with the fixed rate of 30k bps, and the SF of 256. Its transmission is stopped in the former 256

chips of each slot, which are used to transmit PSCH and SSCH. That is, the PCCPCH, PSCH and

SSCH are transmitted in time division mode.

As the PCCPCH transmits the cell SFN, it can act as the direct frame timing reference of the

downlink and the indirect frame timing reference of the uplink for all the physical channels. All the

channels of SCH (primary and secondary), CPICH (primary and secondary), PCCPCH and

PDSCH have the same frame timing. The frame timimg of the SCCPCH may vary with different

SCCPCH, but the difference between it and the frame timing of the PCCPCH is the multiples (0 to

149 times) of the 256 chips. The frame timing of the PICH is 7680 chips ahead of that of the

SCCPCH. Thus the UE can read to see whether there is PI on the PICH. If so, it can read the

corresponding PI from the subsequent SCCPCH (PCH). The frame timing of the DPCH may vary

with the different DPCHs. But the difference between it and the frame timing of the PCCPCH is

the multiples of 256 chips (0 to 149 times).

The system information broadcast procedure is used to broadcast system information to the

UE in the idle or connected mode. The system information is delivered on the BCCH. The BCCH

can be mapped to the BCH or FACH common transport channel. The purpose of system

information update is the NodeB can apply the scheduling and the system information segment

contents on the BCCH. The NodeB should also be consistent with the MIB/SB/SIB in this

message on the BCCH. If the SYSTEM INFORMATION UPDATE REQUEST message contains

the BCCH Modification Time IE, NodeB will apply the BCCH scheduling information (includng


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the combination of IB adding, reducing and content updating) for the first time according to the

value of the SFN set by this IE. Otherwise, NodeB will update the scheduling information on the

BCCH as much as possible. Refer to the message analysis in Section 5.

2.1.3 System Information Update

The UE and the UTRAN may use different mechanisms for SIB update. If the SIB contains a

value tag, the UTRAN should indicate the time to change an IE. This time is determined by means

of changing the value tag. Even though the value tag is not changed, the UE should consider that

the SIB will become invalid six hours after it is received. In addition, such SIBs exist, in which the

IEs are changed too frequently to indicate the change with the value tag. Such SIBs are not

related to the value tag in the primary information block or the value tag of the upper-level SIB.

The stored SIB should be taken as invalid after the UE is powered off.

Modifying SIB with value tag

When the system information is changed, the UTRAN should execute the following

operations to indicate the UE of these system information changes.

1. It updates the system information in the SIB

2. It updates the upper-level SIB with the value tag in the updated SIB if the updated SIB

is connected to the upper-level SIB

3. It updates the primary information block with the value tag in the updated SIB or the

upper-level SIB, and changing the value tag in the primary information block

4. It transmits the new primary information block on the BCH mapped by the BCCH, and

then the updated SIB

5. It transmits the new primary information block on the FACH mapped by the BCCH, so

that all the UEs in the CALL_FACH state can get the information. The UTRAN can

retransmit the new primary information block on the FACH so as to increase the correct

receiving rate of this information.

6. It transmits the PAGING TYPE 1 message on the PCCH, so that the UEs in the idle or

connected (CELL_PCH or URA_PCH) mode can get the information. In the IE of BCCH

Modifacation Information in the PAGING TYPE 1 message, the UTRAN should indicate

the new value tag for the primary information block. The PAGING TYPE 1 message

should be transmitted in all paging occasions. For the BCCH Modification Information

on the PCH, the system information should not be changed to frequently, but should

coordinate with the maximum DRX cycle supported by the UTRAN.

7. After receiving the PAGING TYPE 1 message, the UE should check the value tag of

the primary information block indicated in the IE of BCCH Modification Information. If it

is different from the value stored in the VALUE_TAG, and then read the new primary

information block according to the present sequence information.

8. After the UE receives the new primary information block on the BCH or FACH mapped


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by the BCCH, it should store the new value tag (transmitted in the VALUE_TAG

variable in the primary information block, and then check the IE of value tag of all SIBs

used by the UE. If there is change, the UE should read this SIB. After receiving the

modified SIB, the UE executes the operations specified in Section 8.1.1.5 of the 25.331

protocol.

Modifying system information without value tag

When the UE knows that the SIB contains no value tag, it should start up a timer, whose

value equals to the repetition cycle of the SIB (SIB_REP). When the timer expires, the information

transmitted by this SIB should be taken as invalid. Before using the value contained in the system

IE, the UE should get the new SIB. After receiving the modified SIB, the UE executes the

operations specified in Section 8.1.1.5 of the 25.331 protocol.

Time critical modification of SIB

For the modification of some system IEs (for example, re-configuration of the channel), it is

essential to know the time of the modification. In this case, the UTRAN executes the following

operations to notify the UE of these changes:

1. It transmits the PAGING TYPE 1 message on the PCCH, so that the UE in the CELL_PCH

and URA_PCH state can acquire the information. In the BCCH Modification Information, the

UTRAN should indicate the change time and the new value tag suitable for the primary

information block after the change. The PAGING TYPE 1 message should be transmitted in

all paging occasions (it is the continuous 256 frames at present (with the paging cycle of 2^8 ).

(The PIs of the CN will be discarded in this case).

2. It transmits the SYSTEM INFORMATION CHANGE INDICATION message on the FACH

mapped by the BCCH, so that all the UEs in the CELL_FACH state can acquire the

information. In the IE ofBCCH Modification Information, the UTRAN should indicate

change time and the new value tag suitable for the primary information block after the change.

The UTRAN can repeat transmitting the SYSTEM INFORMATION CHANGE INDICATION

message on the FACH so as to increase the correct receiving rate of this information.

3. The UE updates the system information, and changes the value tag in the corresponding

SIB.4. If the updated SIB is connected to the upper-level SIB, the UE updates the upper-level SIB

with the value tag in the updated SIB.

5. It updates the new information block with the value tag in the updated SIB or the upper-level

SIB, and changes the value tag of the primary information block.

6. When the designated time comes, it transmits the new primary information block on the BCH

mapped by the BCCH, and then transmits the updated SIB on the BCCH.

7. After receiving the PAGING TYPE 1 orSYSTEM INFORMATION CHANGE INDICATION

message, the UE should wait until the time indicated by the IE BCCH Modification

Information comes, and then read the new primary information block.


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8. When receiving the new primary information block, the UE should store the value tag of the

new primary information block, and check the IE of value tag of all SIBs used by the UE. If it

is different from the value stored in the VALUE_TAG, the UE will read corresponding SIB.

After receiving the modified SIB, the UE executes the operations specified in Section 8.1.1.5

of the 25.331 protocol.

9. If the UE cannot find the primary information block, it considers that the physical

re-configuration has happened, and then carries out new cell searching.

2.1.4 Description of IEs of SIBs

Here only provides the description of the IEs of the SIBs realized by RNC V1.2.

2.1.4.1 MIB:

By comparing the latest MIB tag, the UE can determine whether to update the MIBinformation stored previously.

MIB contains some basic information of the access network, such as PLMN information,

MNC and MCC.

It contains the scheduling information of other SIBs (SB1, SB2 and SIB1). Where, the

scheduling information of SB1 and SB2 must be put in the MIB, and that of others can be put

in SB1 and SB2.

2.1.4.2 SIB1:

NAS information

CN DOMAIN information:

T3212: CS domain periodical location update, once every 1/10 hour;

T3312: SGSN MM periodical route update;

NMO: no GS information between SGSN and MSC/VLR, with NMO being 1;

DRX: it is equal to 2^K * PBP, with K being the DRX cycle length coefficient of the CN domain,

and PBP being the number of paging block cycles, and FDD being 1.

The timer and counter constants of the UE in connected mode: the timer constant used for

the UE capability information (T304), the timer constant used for RRC connection release

completion (T308), the timer constant used for cell reselection in connected mode (T309), the

timer constant used for transmitting the PUSCH capability request (T310), the timer constant

used for selecting PUSCH allocation hangup in the physical common shared channel

allocation (T311), the timer constant used for out-of-sync. Indication in connected mode

(T313), the timer constant used for indicating radio link failure (T314 and T315).


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Various timer constants of the UE in idle mode: The timer constant used for RRC connection

setup (T300) and the synchronization indication timer constant used for creating dedicated

channel (T312).

Note: [1] In this version of protocol, the UE does not use T301 or N301. The UE starts thetimer T302 after transmitting CELL UPT/URA UPT, and stops this timer after the receiving

CONFIRM. Once the timer expires, and if V302


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[10] The UE starts the timer T313 after tdetecting N313 (the maximum number of continuous

out-of-sync indications received from L1) continuous out-of-sync indications, and stops this timer

after detecting N315 (the maximum number of continuous in-sync indications received from L1

during the timing period of T313) continuous synchronization indications. Once the timer expires,

the radio link will be disconnected.

[11] The UE starts T314 only when the radio link failure criteria are met and the radio bearer

associated with the T314 timer exists, and stops this timer when the cell updating procedure is

completed. For the case of timeout, refer to Section 8.3.1.13 of the 25.331 protocol. According to

the protocol, when the cell updating procedure is initiated for RRC connection re-setup, and if

either T314 or T315 expires, and T302 is not running, it is necessary to release the RAB related to

T314/T315. However, RR does not support the crossing flow for the cell updating and RAB

configuration releasing, so T314/T315 should be set to 0 or a value greater than T302N302.

[12] The timer T316 is initiated when the UE in the URA_PCH/CELL_PCH detects it is out of

the service area, and this timer is stopped when the UE detects it enters the service area again. If

the UE is in the service area, it initiates the cell updating procedure, and the timer T317 is initiated.

When the UE detects the state is transited to CELL_FACH after entering the service area and

initiates the cell updating procedure, the UE will enter idle mode once T317 expires.

[13] The UE starts the timer after transmitting RRC REQ, and stops this timer after receiving

RRC CON SETUP. Once the timer expires, and if V300


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2. Cell selection and reselection. When all the above three IEs are in the NOT_XXX state,

this cell can be selected in the cell selection and reselection in the connection and idle mode.

When the cell is in the not barred or not reserved for operator use or reserved for SoLSA state,

the UE that does not support SoLSA cannot access this cell. When the cell is in the state of not

barred or reserved for operator use, the users with the AC level of 11 to 15 in the home PLMN can

access this cell. The users with the AC level of 0 to 10 cannot access this cell. When the cell is in

the barred state, the UE cannot select this cell, but it provides emergency call service in general

cases, unless this cell in the IE of Access class barred list indicates this cell prohibited emergency

call. The UE ignores the IE of Cell Reserved for SoLSA. The UE can select other cells according

to the following rules:

[1] If the IE of Intra-frequency cell re-selection indicator in the Cell Access Restrict

section is ALLOWED, and if the cell reselection condition is met, the UE can select another

intra-frequency cell.

[2] If this UE camps on other cells, it will delete this cell from the neighboring cell set within

the time of Tarred. The parameter of Tarred and the cell state are provided in the system

information of Cell Access Restriction.

[3] If the UE does not select other cells and this cell is still the best serving cell, the UE will

check the state of this cell within the timeofTarred.

[4] If the IE of Intra-frequency cell re-selection indicator in the Cell Access Restrict

section is notallowed, even if the cell reselection condition is met, the UE cannot select the best

serving cell with the same frequency with the barred cell. The emergency call is the exception,

that is, the emergency call service ignores this IE.

[5] If this cell is still the besting service cell, the UE checks the state of this cell within the

Tarred time.

3. Access control. The UEs that camp on this cell will not detect the access level or the

related cell access restriction information. That is, the UE will not discard the cell that it camps on,

as it bars other UEs of all levels from accessing. Therefore, the change of the access restrictioncondition will not trigger the cell reselection procedure of the UE. Before transmitting the RRC

CONNECTION REQUEST message to the cell, the UE will detect the access level and the related

cell access restriction information. For the UE starting the initial cell access when it selects

UTRAN for inter-system measurement on other cells (it enters connected mode) and the UEs in

connected mode, the access level and cell restrict condition information will be ignored.

4. Emergency call. Generally, all the cells in the not barred state will provide the emergency

service, in spite of the restriction condition and reserving condition. If necessary, the restriction on

the emergency calls will be indicated in the IE of Access class barred list. For the details of the IE

of Access class barred list, refer to TS 22.201.


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2.1.4.5 SIB5:

PICH-PowerOffset

AICH-PowerOffset

PrimaryCCPCH-Info: tx-DiversityIndicator for FDD

PRACH-SystemInformationList:

SCCPCH-SystemInformationList:

CBS-DRX-Level1Information

Note:

1. The SIB5 contains the configuration information of the common channel, such as

information received by paging. To fast calculate the paging time during cell reselection, it is

helpful to shorten the repetition cycle of SIB5.

2. The paging and SCCPCH in idle mode. If one or more PCHs are set up in a cell, each

SCCPCH bears one PCH, and each PCH has one PICH respectively, more than one PCH and

PICH will be defined in SIB5, and the UE will select one SCCPCH in the IMSI-based list of SIB5

according to this rule: the selected SCCPCH index= IMSI mod K, where K is the number of

SCCPCHs for bearing PCH in the cell (that is the number of SCCPCHs for bearing FACH is not

included). The relevant information of SCCPCH is sequenced from 0 to k-1 in the system

information. The index of SCCPCH uniquely identifies the PCH borne by the SCCPCH in this cell

as well as the relevant PICH. When the UE has no IMSI, for emergency call for example, the IMSI

is regarded as 0.

3. SCCPCH selection in connected mode. If the UE enters connected mode from idle

mode by transmitting the RRC CONNECTION REQUEST message, it will select the SCCPCH

bearing FACH in SIB5 based on the Initial UE identity according to the following rules to receive

the RRC CONNECTION SETUP message: the selected SCCPCH index= Initial UE Identity

mod K. where K is the number of SCCPCHs for bearing FACH in the cell (that is the number of

SCCPCHs for bearing PCH is not included). The relevant information of SCCPCH is sequenced

from 0 to k-1 in the system information. The initial UE identity is obtained by the UE by

transmitting the IE in RRC CONNECTION REQUEST. Refer to Section 8.2 of the 25.304 protocol,

and SIB5 in the 25.331 protocol.

4. Discontinuous connection. The UE in idle mode can use the discontinuous receiving

method (DRX) to lower the power consumption. When DRX is used, the UE only needs to monitor

the PI within each DRX period. The length of the paging period is MAX(2K,PBP) frames, where K

is an integer, and PBP is the paging block period. The PBP is only used for TDD, and it is equal to

the receiving period of PICH. For FDD, PBP=1. The CBS-DRX of SIB5 is only for the

discontinuous receiving for CTCH, and this will be realized in V1.3.


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2.1.4.6 SIB7:

UL-Interference: Uplink interference information (-110 to -70)

prach-Information-SIB5-List

prach-Information-SIB6-List, optional

expirationTimeFactor: expirationtimer=MAX ([320ms], SIB_REPexpirationTimeFactor),

indicating update period, with expirationTimeFactor:: 18.

Note: SIB7 includes the parameters requiring constant changes transmitted on the RACH

uplink, such as uplink interference, and it is not updated with the value tag of MIB. It must be read

from the BCCH before the usage of these parameters and the transmission in short repeated

cycle.

2.1.4.7 SIB11:

FACH measurement occasion info

Measurement control system information

Note: The size of the SIB11 depends on the number of adjacent cells and the volume of

measurement control information contained. When it is supposed that only one cell exists and

there is other measurement control information, this information block will have no segmentation

in a TTI. When there is 32 adjacent cells (including 12 intra-frequency cells, 12 inter-frequency

cells and 8 GSM cells for example), SIB11 will use 10 TTIs. All these are suitable for SIB12 in

connected mode.

2.1.4.8 SIB18:

Idle mode PLMN identities

Connected mode PLMN identities

2.2 RRC Connection

UE UTRAN

RRC CONNECTION REQUEST

RRC CONNECTION SETUP

RRC CONNECTION SETUP COMPLETE

Figure 6RRC signalling connection setup process


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To access network service, the UE must set up RRC connection at the AS and UTRAN,

namely the RRC CONN REQ for setting up channel allocated by UTRAN, shown in Figure 6, and

then it uses this AS connection for the signalling exchange with the CN. As UTRAN can decide

the initial connected state, CELL_FACH or CELL_DCH, of the UE requesting to access, that is,

different common transport channels mapped by the DCCH corresponds to different RRC flows.

2.2.1 RRC_CONNECTION_REQUEST

Figure 7 shows IEs of this message.

UE information elements

Initial UE identity: Indicates whether a UE has available TMSI, PTMSI, IMSI and IMEI

information, based on the priority of the UE.

Establishment cause: It refers to the RRC connection setup cause, including: Originating

Conversational Call, Originating Streaming Call, Originating Interactive Call, Originating

Background Call, Originating Subscribed traffic Call, Terminating Conversational Call,

Terminating Streaming Call, Terminating Interactive Call, Terminating Background Call,

Emergency Call, Inter-RAT cell re-selection, Inter-RAT cell change order, Registration,

Detach, Originating High Priority Signalling, Originating Low Priority Signalling, Call

re-establishment, Terminating High Priority Signalling, Terminating Low Priority Signalling,

Terminating - cause unknown.

Protocol error indicator: It is the protocol error indicator, including the options of No error,

ASN.1 violation or encoding error, Message type non-existent or not implemented, Message

not compatible with receiver state, Information element value not comprehended, Information

element missing, Message extension not comprehended.

Measurement information elements

Measured results on RACH: It reports the measured results on RACH of the intra-frequency

cell (monitoring set) designated in SIB11, including the qualities of the primary scrambling

code and pilot Ec/No of the cell.


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Figure 7RRC CONNECT REQUEST

2.2.2 RRC_CONNECTION_SETUP & RRC_CONNECTION_SETUP_COMPLETE

When the DCCH is mapped to the common channel (RACH/FACH), the RRC connection

(SRB) does not need to set up a radio link. But during the service setup (TRB), as the DTCH is

mapped to the DCH, a radio link is to be set up, and the RRC connection will be re-set up on the

dedicated channel. When the DDCH is mapped to the DCH, the RRC connection (SRB) needs to

set up a radio link. During the service setup, as DTCH also needs to be mapped to the DCH, the

number of DCHs will be increased, which will lead to repeated configuration of radio links. In

these two cases, the RRC connection request messages initiated by the UE are identical. The

following is the description of the IEs in the RRC connection setup messages in these two cases.

Figure 8, Figure 10, Figure 11 and Figure 13 are two groups of the corresponding flow messages.


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2.2.2.1 UE in the CELL_FACH state after the RRC connection setup

Figure 8RRC CONNECT SETUP (DCCH is mapped on common channel)

Figure 8 shows the IEs of the RRC CONNECTION SETUP message.

UE Information Elements: When the UE is receiving this message, it will check whether the

ID in this IE is consistent with that of itself. If not so, it will discard this message; if so, it will

read the indication of UE in connected mode from the rrc StateIndication of the UTRAN. If

frequency information is contained, it will select a cell for camping on according to the cell

reselection rule in connected mode. Then it will select PRACH (refer to Section 8.5.17 in the

25.331 protocol) and SCCPCH (refer to Section 8.5.19 in the 25.331 protocol), ignoring the

IE of UTRAN DRX cycle length coefficient, without using DRX. The UE has performed

common channel synchronization before transmitting RRC CONN REQ, so this step is

omitted there.


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RB Information Elements: Figure 8 displays four singling RB IEs. At present, SRB1 is used

to transmit the message in the unacknowledgement mode (RLC UM), such as RRC CONN

REL, URA UPDATE CONFIRM, CELL UPDATE CONFIRM and PHYSICAL SHARED

CHANNEL ALLOCATION (Node: the RRC CONN REQ and RRC CONN SETUP messages

are transmitted on the CCCH borne by SRB0). SRB2 is used to transmit the message in the

acknowledgement mode (RLC AM). At present, most messages (except the directly

transmitted messages of the NAS layer) are transmitted on the DCCH of this bearer. SRB3

and SRB4 are used to transmit the directly transmitted messages in the RCL AM mode on

the NAS layer. Each SRB contains the parameters of the RLC layer of the QoS guaranteed in

this bearer, as shown in Figure 9.

TrCH Information Elements (ul AddReconfTransChInfoList and dl

AddReconfTransChInfoList): This message content is invalid in Figure 8, as RACH and

FACH have been set up when the cell is created. DCH 6 filled in is only for message

alignment, which will not be adopted but reserved by the UE. This useless DCH will be

deleted from ul/dl DeletedTransChInfoList during RB SETUP.

maxAllowed UL TX Power: It is the maximum transmit power of the UE, and is set to 24dBm,

as shown in the figure.


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Figure 9MappingInfo of SRB1 and SRB2 of the DCCH mapped to the common channel


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Figure 10 RRC CONNECT SETUP COMPLETE (DCCH is mapped on the common channel

Figure 10 shows the IEs of RRC CONNECTION SETUP COMPLETE message:

UE Information Elements: It contains values of STARTCS or STARTPS for triggering the

encryption and integrality protection.

Other information elements: It contains the radio access capability information of the UE,

including PDCP capability (indicating whether the PDCP supports lossless transition), RLC

capability (sizes of all RCL AM BUFFERs and the maximum RLC window), transport channel

capability (including maximum transmission and receiving Bit, conversion bit, TB, TF, TFC,

and so on), radio frequency capability (including transmit capability of the UE and the

uplink/downlink frequency interval), physical channel capability (such as maximum transmit

Bit), inter-system access capability, encryption and integrality protection algorithm supporting

capability, measurement capability (for example, whether the uplink/downlink supports

compressed mode measurement. Huaweis UE supports downlink compressed mode

measurement only).

2.2.2.2 UE in CELL_DCH state after RRC connection setup

Figure 11 shows the IEs of the RRC CONNECTION SETUP message:


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Figure 11 RRC CONNECT SETUP (DCCH is mapped to the dedicated channel

UE Information Elements: When the UE is receiving this message, it will check whether the

ID in this IE is consistent with that of itself. If not so, it will discard this message; if so, it will

read the indication of UE in connected mode from the rrc StateIndication of the UTRAN. If

the UE is in the CELL_DCH state, it will enter the synchronization procedure introduced in the

25.214 protocol. Because when the UE receives this message, NodeB has created the

downlink radio link, so the two stages of downlink synchronization specified in Section 4.3.1.2

of the 25.214 protocol: Stage 1, the physical layer does not report the Out of sync message

within 160ms after the DCH is set up initially, but it will judge the in-sync state with this

criterion: the physical layer estimates the quality of the downlink DPCCH of the former 40ms,

if this quality is always better than the threshold ofQin, it will report the In syncmessage to


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the high layer. However, before the 40-ms DPCCH quality measurement is completed, this

criterion cannot be realized. Stage 2, 160ms after the DCH is set up, the physical layer will

report the Out of sync and In sync messages according to the actual detection result. Refer to

the protocol for the criterion for judging Out of sync. The out-of-sync timer (T313/N313) of

downlink radio link and the in-sync timer (T315), refer to the description of SIB1 in the

previous part. After the downlink synchronization and the UE transmits pc preamble (the

number of frames in ul DPCH Info) frames on the UL DPCCH channel, the UL DPDCH starts

data transmission. The signalling on SRB is transmitted on the UL DPDCH only after SRB

Delay (the number of frames specified in ul DPCH Info) frames. The uplink is judged by

NODE-B, requiring the detection of the synchronization mode of all the radio link sets of the

uplink in each radio frame. Each radio link set has only one synchronization mode. In NODEB,

each radio link set will be tranfered to one of the following three states: initial state,

out-of-sync state and in-sync state. The protocol does not specify the judging criteria directly,

it just recommends to judge based on the DPCCH quality estimation or CRC check. For the

realization mode, refer to the downlink judging mode mentioned above.

RB Information Elements: Refer to 2.2.2.1 for details. The difference from 2.2.2.1 is the

logical channel in RB MappingInfo is mapped to DCH.

TrCH Information Elements (ul CommonTransChInfo, ul AddReconfTransChInfoList, dl

CommonTransChInfo, dl AddReconfTransChInfoList): including the information of TFC, TF

and dl DCH Bler.

PhyCH information elements (frequencyInfo): Uplink/downlink frequency information, for

the UE in connected mode to perform cell reselection in the intra-frequency cell.

maxAllowed UL TX Power: The maximum transmit power of the UE, it is 19dBm as shown in

the figure.

Uplink radio resources (ul DPCH Info): It contains the pc preamble, SRB delay and the

uplink power control algorithm, the power offset of the UL DPCCH, scrambling code, spread

factor, TFCI and punching limit used for UL DPCCH synchronization.

Downlink radio resources (dl CommonInfomation and dl Information PerRl List): It

contains the power control mode of the DL DPCH, TFCI, DTX insertion method

(positionFixedorFlexible, it is Fixed at present, which is used for downlink compressed mode

with the punching method), primary scrambling code and channelization code.

Figure 13 shows the IEs of the RRC CONNECTION SETUP COMPLETE message. Refer to

Section 2.2.2.1 for details.


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Figure 12 MapingInfo of SRB1 and SRB2 of the DCCH mapped to the DCH

Figure 13 RRC CONNECT SETUP COMPLETE (DCCH is mapped to the DCH)


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WCDMA RNO Access Procedu