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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA UE Behaviors in Idle Mode
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Page1Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Forewordz UE behaviors in idle mode include :
PLMN selection
System information reception
Cell selection and reselection
Location registration
Paging procedure
Access procedure
z PLMN selectionUsed to ensure that the PLMN selected by the UE properly provides services.
z Cell selection and reselectionUsed to ensure that the UE finds a suitable cell to camp on.
z Location registrationUsed for the network to trace the current status of the UE and to ensure that the UE is camped on the network when the UE does not perform any operation for a long period.
z System information receptionThe network broadcasts the network information to a UE which camps on the cell to control the behaviors of the UE.
z PagingUsed for the network to send paging messages to a UE which is in idle mode, CELL_PCH state, or URA_PCH state.
z AccessFrom the view of access stratum, access is the procedure UE shift from idle mode to connected mode.
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Page2Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page3Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page4Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Searchz UE does not have UTRAN carrier information
In order to find a suitable cell to stay, UE will scan all the
frequencies in UTRAN. In each carrier, UE just need to find a
cell with best signal
z UE has UTRAN carrier information
UE will try whether the original cell is suitable to stay. If not, UE
still need to scan all the frequencies about UTRAN in order to
find a suitable cell in PLMN
z Typical scenario of first occasion is the first time a new UE is put into use.z The second occasion is very common.
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Page5Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Search
Slot synchronization
Frame synchronization and code-group identification
Primary Scrambling code identification
z 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.
z Step 2: Frame synchronization and code-group identificationDuring 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.
z 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.
z If the UE has received information about which scrambling codes to search for, steps 2 and 3 above can be simplified.
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Page6Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
PLMN Selectionz UE shall maintain a list of allowed PLMN types. In the
PLMN list, the UE arranges available PLMNs by priorities.
When selecting a PLMN, it searches the PLMNs from the
high priority to the low.
z The UE selects a PLMN from HPLMNs or VPLMNs.
z UE can get the system information from PCCPCH, and the PLMN information is transmitted in MIB of PCCPCH
z After getting the MIB, UE can judge weather the current PLMN is the right one. If so, UE will get the SIB scheduling information from the MIB; if not, UE will search another carrier, do this procedure again
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Page7Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
PLMN Selection (Cont.)z PLMN Selection in HPLMNs
Automatic PLMN Selection Mode
The UE selects an available and suitable PLMN from the whole
band according to the priority order
Manual PLMN Selection Mode
The order of manual selection is the same as that of automatic
selection.
z The priority order for automatic PLMN selection mode
The PLMN selected by the UE before automatic PLMN selection
Previously selected PLMN6
The PLMNs are arranged in descending order of signal quality.
Other PLMN/access technology combinations excluding the previously selected PLMN5
The PLMNs are arranged in random order
Other PLMN/access technology combinations with the high quality of received signals excluding the previously selected PLMN
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The PLMNs are arranged in priority order
PLMNs contained in the "Operator Controlled PLMN Selector with Access Technology" data field in the SIM excluding the previously selected PLMN
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The PLMNs are arranged in priority order
PLMNs contained in the "User Controlled PLMN Selector with Access Technology" data field in the SIM excluding the previously selected PLMN
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Home PLMNsHPLMNs1
RemarkPLMN typeOrder
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Page8Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
PLMN Selection (Cont.)z PLMN Selection in VPLMNs
If a UE is in a VPLMN, it scans the user controlled PLMN
selector field or the operator controlled PLMN selector field
in the PLMN list to find the HPLMN or the PLMN with higher
priority according to the requirement of the automatic PLMN
selection mode.
z A value of T minutes may be stored in the SIM. T is either in the range from 6 minutes to 8 hours in 6-minute steps or it indicates that no periodic attempts shall be made. If no value is stored in the SIM, a default value of 60 minutes is used.
z After the UE is switched on, a period of at least 2 minutes and at most T minutes shall elapse before the first attempt is made.
z The UE shall make an attempt if the UE is on the VPLMN at time T after the last attempt.
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Page9Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page10Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Structure of System Information z System information is organized as a tree, including:
MIB (Master Information Block )
SB (Scheduling Block )
SIB (System Information Block )
z 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.
z 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.
z SB Scheduling Block (SB) gives reference and scheduling information to other SIBs. The
scheduling information of a SIB may be included in only one of MIB and SB.z SIB
System Information Block (SIB) contains actual system information. It consists of system information elements (IEs) with the same purpose.
z Scheduling information for a system information block may only be included in either the master information block or one of the scheduling blocks.
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Page11Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
System Information z SIB1: Contains the system information for NAS and the
timer/counter for UE
z SIB2: Contains the URA information
z SIB3: Contains the parameters for cell selection and cell re-selection
z SIB5: Contains parameters for the common physical channels of the cell
z SIB7: Contains the uplink interference level and the refreshingtimer for SIB7
z SIB11: Contains measurement controlling information
z SIB4: Contains parameters for cell selection and cell re-selection while UE is in connected mode
z SIB6: Contains parameters for the common physical channels of the cell while UE is in connected mode
z SIB8: Contains the CPCH static informationz SIB9: Contains the CPCH dynamic informationz 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
z SIB12: Contains measurement controlling information in connecting modez SIB13: Contains ANSI-41 system informationz SIB14: Contains the information in TDD modez SIB15: Contains the position service informationz SIB16: Contains the needed pre-configuration information for handover from other RAT to
UTRANz SIB17: Contains the configuration information for TDDz 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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Page12Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Reception of System Information z The UE shall read system information broadcast on a BCH
transport channel when the UE is in idle mode or in
connected mode, that is, in CELL_FACH, CELL_PCH, or
URA_PCH state.
z The UE may use the scheduling information in MIB and SB to locate each SIB to be acquired. If the UE receives a SIB in a position according to the scheduling information and consider the content valid, it will read and store it.
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Page13Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page14Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Selectionz When the PLMN is selected and the UE is in idle mode, the
UE starts to select a cell to camp on and to obtain services.
z There are four states involved in cell selection:
Camped normally
Any cell selection
Camped on any cell
Connected mode
z Camped normally: The cell that UE camps on is called the suitable cell. In this state, the UE obtains normal service.
z Any cell selection: In this state, the UE shall attempt to find an acceptable cell of an any PLMN to camp on, trying all RATs that are supported by the UE and searching first for a high quality cell
z Camped on any cell: The cell that UE camps on is called the acceptable cell. In this state the UE obtains limited service. The UE shall regularly attempt to find a suitable cell of the selected PLMN, trying all RATs that are supported by the UE.
z Connected mode: When returning to idle mode, the UE shall use the procedure Cell selection when leaving connected mode in order to find a suitable cell to camp on and enter state Camped normally. If no suitable cell is found in cell reselection evaluation process, the UE enters the state Any cell selection.
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Page15Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Selection (Cont.)z Two types of cell selection:
Initial cell selection
If no cell information is stored for the PLMN, the UE starts this
procedure.
Stored information cell selection
If cell information is stored for the PLMN, the UE starts this
procedure.
z 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.
z Stored information cell selection: For this procedure, the UE need 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 it finds one. Otherwise, the "Initial cell selection" procedure is triggered.
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Page16Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Selection Criteria
minqualqualmeasqual QQS =oncompensatirxlevrxlevmeasrxlev PQQS = min
z Criterion S is used by the UE to judge whether the cell is
suitable to camped on.
z Criterion S : Srxlev > 0 & Squal > 0, where:
z 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.
z If the cell doesnt 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.
z If no cell satisfies S criteria, UE will take the area as dead zone and continue the PLMN selection and reselection procedure.
MaxUE_TXPWR_MAX_RACH-P_MAX0, dBmPcompensationMaximum TX power level an UE may use when accessing the cell on RACH (read in system information) (dBm)
UE_TXPWR_MAX_RACH
Maximum RF output power of the UE (dBm)P_MAX
Minimum required RX level in the cell (dBm)Qrxlevmin
Minimum required quality level in the cell (dB)Qqualmin
Measured cell RX level value. This is received signal, CPICH RSCP for current cells (dBm)
Qrxlevmeas
Measured cell quality value. The quality of the received signal expressed in CPICH Ec/N0 (dB) for current cell
Qqualmeas
Cell RX level value (dBm)Srxlev
Cell quality value (dB)Squal
ExplanationParameters
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Page17Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of S Criterionz QUALMEAS
Parameter name: Cell Se-reselection quality measure
Recommended value: CPICH_ECNO
z QQUALMIN
Parameter name: Min quality level
Recommended value: -18, namely -18dB
z QUALMEAS Parameter name: Cell Sel-reselection quality measure Value range: CPICH_ECNO(CPICH Ec/N0),CPICH_RSCP(CPICH RSCP) Physical unit: None. Content: Cell selection and reselection quality measure, may be set to CPICH Ec/N0
or CPICH RSCP. Recommended value: CPICH_ECNO.
z QQUALMIN Parameter name: Min quality level Value range: -24~0 Physical value range: -24~0; step: 1 Physical unit: dB 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.
Recommended value: -18 Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page18Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of S Criterionz QRXLEVMIN
Parameter name: Min Rx level
Recommended value: -58, namely -115dBm
z MAXALLOWEDULTXPOWER
Parameter name: Max allowed UE UL TX power
Recommended value: 21, namely 21dBm
z QRXLEVMIN Parameter name: Min Rx level Value range: -58~-13. Physical value range: -115~-25; step: 2 (-58:-115; -57:-113; ..., -13:-25 ). Physical unit: dBm. 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.
Recommended value: -58. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.z MAXALLOWEDULTXPOWER
Parameter name: Max allowed UE UL TX power Value range: -50~33 Physical value range: -50~33; step: 1 Physical unit: dBm Content: The maximum allowed uplink transmit power of a UE in the cell, which is
related to the network planning. Content: Allowed maximum power transmitted on RACH in the cell. It is related to network planning.
Recommended value: -21 Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page19Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Reselectionz After selecting a cell and camping on it, the UE periodically
searches for a better cell according to the cell reselection
criteria. If finding such a cell, the UE selects this cell to
camp on.
z UE should monitor the quality of current cell and neighbor cells in order to camp on the better cell to initiate service. The better cell is the most suitable one for the UE to camp on and obtain services. The QoS of this cell is not necessarily more satisfying.
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Page20Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria (Cont.)z Intra-frequency measurement
Squal Sintrasearch
Qqualmeas Qqualmin Sintrasearch
Qqualmeas Qqualmin + Sintrasearch
z Parameters of the measurement start criteria
Minimum required quality level in the cell (dB) .Qqualmin
Measurement threshold for UE to trigger inter-RAT cell reselection, compared with Squal.
SsearchRATm
Measurement threshold for UE to trigger inter-frequency cell reselection, compared with Squal.
Sintersearch
Measurement threshold for UE to trigger intra-frequency cell reselection, compared with Squal.
Sintrasearch
Cell quality value (dB)Squal
DescriptionName
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Page21Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria (Cont.)z Inter-frequency measurement
Squal Sintersearch
Qqualmeas Qqualmin Sintersearch
Qqualmeas Qqualmin + Sintersearch
z Parameters of the measurement start criteria
Minimum required quality level in the cell (dB) .Qqualmin
Measurement threshold for UE to trigger inter-RAT cell reselection, compared with Squal.
SsearchRATm
Measurement threshold for UE to trigger inter-frequency cell reselection, compared with Squal.
Sintersearch
Measurement threshold for UE to trigger intra-frequency cell reselection, compared with Squal.
Sintrasearch
Cell quality value (dB)Squal
DescriptionName
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Page22Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria (Cont.)z Inter-RAT measurement
Squal SsearchRATm
Qqualmeas Qqualmin SsearchRATm
Qqualmeas Qqualmin + SsearchRATm
z Parameters of the measurement start criteria
Minimum required quality level in the cell (dB) .Qqualmin
Measurement threshold for UE to trigger inter-RAT cell reselection, compared with Squal.
SsearchRATm
Measurement threshold for UE to trigger inter-frequency cell reselection, compared with Squal.
Sintersearch
Measurement threshold for UE to trigger intra-frequency cell reselection, compared with Squal.
Sintrasearch
Cell quality value (dB)Squal
DescriptionName
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Page23Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Measurement Start Criteria
z IDLESINTRASEARCH
Parameter name: Intra-freq cell reselection threshold for idle
mode
Recommended value: None
z CONNSINTRASEARCH
Parameter name: Intra-freq cell reselection threshold for
connected mode
Recommended value: None
z IDLESINTRASEARCH Parameter name: Intra-freq cell reselection threshold for idle mode Value range: {{-16~10},{127}} . Physical value range: -32~20; step: 2. Physical unit: dB. 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.
Recommended value: None. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.z CONNSINTRASEARCH
Parameter name: Intra-freq cell reselection threshold for connected mode Value range: {{-16~10},{127}} . Physical value range: -32~20; step: 2. Physical unit: dB 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.
Recommended value: None. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page24Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Measurement Start Criteria
z IDLESINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for idle
mode
Recommended value: None
z CONNSINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for
connected mode
Recommended value: None
z IDLESINTERSEARCH Parameter name: Inter-freq cell reselection threshold for idle mode Value range: {{-16~10},{127}} . Physical value range: -32~20; step: 2. Physical unit: dB. 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.
Recommended value: None. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.z CONNSINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for connected mode Value range: {{-16~10},{127}} . Physical value range: -32~20; step: 2. Physical unit: dB 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.
Recommended value: None. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page25Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Measurement Start Criteria
z SSEARCHRAT
Parameter name: Inter-RAT cell reselection threshold
Recommended value: None
z SSEARCHRAT Parameter name: Inter-RAT cell reselection threshold Value range: {{-16~10},{127}} . Physical value range: -32~20; step: 2. Physical unit: dB. 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.
Recommended value: None. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page26Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria Description
z The intra-frequency, inter-frequency, and inter-RAT measurement criteria are as shown in the figure.
z Usually, Sintrasearch > Sintersearch > SsearchRATm
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Page27Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Reselection Criteriaz Criterion R is used for intra-frequency, inter-frequency cells
and inter-RAT cell reselection.
z The cell-ranking criterion R is defined by :
nsoffsetnmeasnQQR
,,=
hystssmeass QQR += ,
z The cells are ranked according to R criteria specified above ,deriving QQmeas,nmeas,n and QQmeas,smeas,s and calculating R value.
z In Rs, s means serving cell. In Rn, n means neighbor cell.z The offset Qoffset1s,n is used for Qoffsets,n to calculate Rn. The hysteresis Qhyst1s is used
for Qhysts to calculate Rs. z If a TDD or GSM cell is ranked as the best cell, the UE shall reselect that TDD or GSM cell.z If an FDD cell is ranked as the best cell and the quality measure for cell selection and
reselection is set to CPICH RSCP, the UE shall reselect that FDD cell.z 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, 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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Page28Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Hysteresis and Time Interval
TimeTreselection
Quality
Rn
Rs
Qmeas,n
Qmeas,s
Qhyst,s
Qoffsets,n
z 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 Treselection. More than one second has elapsed since the UE camped on the current serving cell.
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Page29Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteriaz IDLEQHYST1S
Parameter name: Hysteresis 1 for idle mode
Recommended value: 2, namely 4dB
z CONNQHYST1S
Parameter name: Hysteresis 1 for connect mode
Recommended value: 2, namely 4dB
z IDLEQHYST1S Parameter name: Hysteresis 1 for idle mode Value range: 0~20. Physical value range: 0~40; step: 2. Physical unit: dB. Content: The hysteresis value in idle mode for serving FDD cells 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.
Recommended value: 2. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.z CONNQHYST1S
Parameter name: Hysteresis 1 for connected mode Value range: 0~20. Physical value range: 0~40; step: 2. Physical unit: dB. Content: The hysteresis value in connect mode for serving FDD cells 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.
Recommended value: 2. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page30Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.)z IDLEQHYST2S
Parameter name: Hysteresis 2 for idle mode
Recommended value: Qhyst1s for idle mode
z CONNQHYST2S
Parameter name: Hysteresis 2 for connected mode
Recommended value: Qhyst1s for connected mode.
z IDLEQHYST2S Parameter name: Hysteresis 2 for idle mode Value range: {{0~20},{255}} . Physical value range: 0~40; step: 2. Physical unit: dB. Content: The hysteresis value in idle mode for serving FDD cells 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. It is optional. If it is not configured, [Hysteresis 1] will be adopted as the value.
Recommended value: Qhyst1s for idle mode . Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and
modify it through MOD CELLSELRESEL.z CONNQHYST2S
Parameter name: Hysteresis 2 for connected mode Value range: {{0~20},{255}} . Physical value range: 0~40; step: 2. Physical unit: dB. Content: The hysteresis value in connect mode for serving FDD cells 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.
Recommended value: Qhyst1s for connected mode. . Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and
modify it through MOD CELLSELRESEL.
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Page31Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.)z TRESELECTIONS
Parameter name: Reselection delay time
Recommended value: 1, namely 1s.
z TRESELECTIONS Parameter name: Reselection delay time Value range: 0~31 . Physical value range: 0~31; step: 1. Physical unit: s. Content: If the signal quality of a neighboring cell is better than the serving cell during
the specified time of this parameter, the UE will reselect the neighboring cell. It is used to avoid ping-pong reselection between different cells. Note: The value 0 corresponds to the default value defined in the protocol.
Recommended value: 1. Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL.
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Page32Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.)z IDLEQOFFSET1SN
Parameter name: IdleQoffset1sn
Recommended value: 0, namely 0dB.
z CONNQOFFSET1SN
Parameter name: ConnQoffset1sn
Recommended value: 0, namely 0dB.
z IDLEQOFFSET1SN Parameter name: IdleQoffset1sn Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in
idle mode Value range: -50 to +50 . Physical value range: -50 to +50; step: 1. Physical unit: dB. Content: This parameter is used for moving the border of a cell. The larger the value of this
parameter, the lower the probability of neighboring cell selection. Recommended value: 0. Set this parameter through ADD INTRAFREQNCELL / ADD INTERFREQNCELL, query it
through LST INTRAFREQNCELL / LST INTERFREQNCELL, and modify it through MOD INTRAFREQNCELL / MOD INTERFREQNCELL.
z CONNQOFFSET1SN Parameter name: ConnQoffset1sn Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in
connected mode Value range: -50 to +50 . Physical value range: -50 to +50 ; step: 1. Physical unit: dB. Content: This parameter is used for moving the border of a cell. The larger the value of this
parameter, the lower the probability of neighboring cell selection. Recommended value: 0. Set this parameter through ADD INTRAFREQNCELL / ADD INTERFREQNCELL, query it
through LST INTRAFREQNCELL / LST INTERFREQNCELL, and modify it through MOD INTRAFREQNCELL / MOD INTERFREQNCELL.
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Page33Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.)z IDLEQOFFSET2SN
Parameter name: IdleQoffset2sn
Recommended value: 0, namely 0dB.
z CONNQOFFSET2SN
Parameter name: ConnQoffset2sn
Recommended value: 0, namely 0dB.
z IDLEQOFFSET2SN Parameter name: IdleQoffset2sn Offset of cell CPICH Ec/No measurement value in cell selection or reselection when the UE is in
idle mode Value range: -50 to +50 . Physical value range: -50 to +50; step: 1. Physical unit: dB. Content: This parameter is used for moving the border of a cell. The larger the value of this
parameter, the lower the probability of neighboring cell selection. Recommended value: 0. Set this parameter through ADD INTRAFREQNCELL / ADD INTERFREQNCELL, query it
through LST INTRAFREQNCELL / LST INTERFREQNCELL, and modify it through MOD INTRAFREQNCELL / MOD INTERFREQNCELL.
z CONNQOFFSET2SN Parameter name: ConnQoffset2sn Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in
connected mode Value range: -50 to +50 . Physical value range: -50 to +50 ; step: 1. Physical unit: dB. Content: This parameter is used for moving the border of a cell. The larger the value of this
parameter, the lower the probability of neighboring cell selection. Recommended value: 0. Set this parameter through ADD INTRAFREQNCELL / ADD INTERFREQNCELL, query it
through LST INTRAFREQNCELL / LST INTERFREQNCELL, and modify it through MOD INTRAFREQNCELL / MOD INTERFREQNCELL.
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Page34Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
35
Page35Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Location Registrationz The location registration includes:
Location update (for non-GPRS)
Route update (for GPRS)
z The location registration is used for the PLMN to trace the current status of the UE and to ensure that the UE is connected with the network when the UE does not perform any operation for a long period.
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Page36Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Periodic Location Registrationz Periodic location registration is controlled by a Periodic
Location Update timer (T3212) or a Periodic Routing Area
Update timer (T3312)
z Periodic location registration may be used to periodically notify the network of the availability of the UE.
z T3212 is for non-GPRS operationz T3312 is for GPRS operation
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Page37Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Location Registration
z T3212
Parameter name: Periodical location update timer [6min]
Recommended value: 10, namely 60min
z ATT
Parameter name: Attach/detach indication
Recommended value: ALLOWED
z T3212 Parameter name: Periodical location update timer [6min] Value range: 0~255. Physical unit: 6 min. 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.
Recommended value: 10. Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN,
modify it through MOD CNDOMAIN.z ATT
Parameter name: Attach/detach indication Value range: NOT_ALLOWED, ALLOWED . Content: 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.
Recommended value: ALLOWED. Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN,
modify it through MOD CNDOMAIN.
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Page38Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
39
Page39Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Paging Initiation z CN initiated paging
z Establish a signaling connection
z UTRAN initiated paging
z Trigger the cell update procedure
z Trigger reading of updated system information
z 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.
z For UTRAN originated 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.
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.
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Page40Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Paging Type 1z If UE is in CELL_PCH,URA_PCH or IDLE statethe paging
message will be transmitted on PCCH with paging type 1CN RNC1 RNC2 NODEB1.1 NODEB2.1 UE
RANAPRANAP
RANAP RANAP
PCCH: PAGING TYPE 1
PAGING
PAGING
PCCH: PAGING TYPE 1
z Paging type 1: The message is transmitted in one LA or RA according to LAI or RAI. 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 procedure to transit state to CELL_FACH.
z 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.
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Page41Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Paging Type 2z If UE is in CELL_DCH or CELL_FACH statethe paging
message will be transmitted on DCCH with paging type 2CN SRNC UE
RANAPRANAP
PAGING
RRCRRCDCCH: PAGING TYPE 2
z Paging type 2: If UE is in CELL_DCH or CELL_FACH statethe paging message will be transmitted
on DCCH with paging type 2 The message will be only transmitted in a cell
z 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.
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Page42Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Typical Call Flow of UE UE NAS UE AS NSS MSC
paging
AUTHENTICATION REQUEST
AUTHENTICATION RESPONSE
RR_SECURITY_CONTROL_REQ
(IK CK)
Security mode control
SETUP
CALL CONFIRM
ALERT
CONNECT
CONNECT ACKNOW LEDGE
RAB setup process
paging
RR_EST_REQ (PAGING RESPONSE)
RR_PAING_IND
INITIAL_DIRECT_TRANSFER
(PAGING RESPONSE)
RANAPRANAP
RRC setup process
z Many problems will cause the target UE cannot receive the paging message properly Power setting of paging channel is unreasonable. Unreasonable paging strategies will result in paging channel congestion, which can
cause paging message loss. Paging parameter is unreasonable Equipment fault
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Page43Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
DRX Procedurez UE receives the paging indicator on PICH periodically, that
is the Discontinuous Reception (DRX)
z The value for the DRX paging cycle length is determined as
follows: :
DRX Cycle Length (2^K)PBP frames
z In idle mode, the UE can monitor the paging in two modes: one is to decode SCCPCH directly every 10ms, the other is to decode the PICH periodically. The second one is the DRX, which is Discontinuous Reception Mechanism.
z The paging period formula: DRX Cycle Length (2^K)*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 period, which is 1 for FDD mode The paging period should be 640ms if K is 6
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Page44Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
DRX Procedure (Cont.)z Through DRX, UE only listens to PICH at certain predefined
time. And UE will read the paging information on SCCPCH if
the paging indicator is 1.
z The value of the Paging Occasion is determined as follows:
Paging Occasion (CELL SFN) =
{(IMSI mod M) mod (DRX cycle length div PBP)} * PBP
+ n * DRX cycle length + Frame Offset
z Paging SFN formula: Paging Occasion (CELL SFN) = {(IMSI mod M) mod (DRX cycle length div PBP)}
*PBP + n *DRX cycle length + Frame Offset n =0, 1, 2and the requirement is the calculated CELL SFN must be below its
maximum value 4096 Frame Offset is 0 for FDD mode M is the number of SCCPCH which carries PCH, and the typical value is 1 The formula cloud be simplified as: SFN = IMSI mod (2^K) + n * (2^K)
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Page45Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
DRX Procedure (Cont.)
( )( )( ) NpNpSFNSFNSFNSFNPIq mod144144mod512/64/8/18
++++=
z UE must calculate q to know which PI to monitor in one
frame of PICH
z The q value is achieved by the following formula :
z Where, PI = (IMSI div 8192) mod NP
z SFN is the paging occasion of the UEz 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
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Page46Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
DRX Procedure (Cont.)
PICH
Associated S-CCPCH frame
PICH frame containing paging indicator
z Time offset between PICH and S-CCPCH
z The timing relationship between PICH and S-CCPCH is defined by the above figure, and the interval is 3 slots duration (2ms, 7680 chips).
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Page47Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of DRXz DRXCYCLELENCOEF
Parameter name: DRX cycle length coefficient
Recommended value: 6
z PICHMODE
Parameter name: PICH mode
Recommended value: V36.
z DRXCYCLELENCOEF Parameter name: DRX cycle length coefficient Value range: 6~9 . Content: This parameter is broadcasted on SIB1. This parameter is used when a UE is
in idle mode. Recommended value: 6. Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN, and
modify it through MOD CNDOMAIN.z PICHMODE
Parameter name: PICH mode Value range: V18, V36, V72, V144 . Physical value range: 18, 36, 72, 144 . Content: Indicating the number of PIs contained in each frame on the PICH. Recommended value: V36 . Set this parameter through ADD PICH, query it through LST PICH.
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Page48Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of DRXz MACCPAGEREPEAT
Parameter name: Number of page re-TX
Recommended value: 1
z MACCPAGEREPEAT Parameter name: Number of page re-TX Number of retransmissions of paging message Value range: 0~2 . Content: If the number of retransmissions of paging message exceeds this parameter
value, retransmissions stop. Recommended value: 1. Set this parameter through SET WFMRCFGDATA, query it through LST
WFMRCFGDATA.
49
Page49Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
50
Page50Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Two Working Mode of UEz Idle mode
After turning on, UE will stay in idle mode
z Connected mode
UE will switch to connected mode which could be CELL_FACH
state or CELL_DCH state from the idle mode
After releasing RRC connection, UE will switch to the idle
mode from the connected mode
z The most important difference between idle mode and connected mode is whether UE has RRC connection with UTRAN or not.
z In idle mode, UE will be identified by IMSI, TMSI or PTMSI and so on.z In connected mode, UE will be identified by URNTI (UTRAN Radio Network Temporary
Identity), which is the ID of one RRC connection.
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Page51Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Random Access Procedurez Definition
Random access procedure is initiated by UE in order to get
service from the system. Meanwhile, the access channels are
allocated to the UE by system
z This process may happen in the following scenarios: Attach and detach LA update and RA update Signaling connection for services
52
Page52Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Random Access Channel
AICH accessslots
10 ms
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4p-a
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4
PRACHaccess slots
SFN mod 2 = 0 SFN mod 2 = 1
10 ms
Access slot set 1 Access slot set 2
z Definition
z UE will transmit the preamble at the access time slotz Each 20ms access frame is composed of two 10ms radio frames, which is divided into 15
access time slot, and 5120 chips for each slotz The PRACH access slots, AICH access slots and their time offset are showed in the above
figure
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Page53Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
RACH Sub-Channels
1413121110987210765436
14131211109855432107648141312111093
7654321021110981413121
76543210011109876543210
Random access sub-channels numberSFN mod 8
z The access slots of different RACH sub-channels are illustrated by the following table
z 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.
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Page54Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Access Service Classz The PRACH resources can be classified into several ASCs,
so as to provide RACH applications with different priorities.
z 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.
z 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.
z The system will assign random access sub-channels and signatures according to the ASC (Access Service Class ) of UE.
z Set ASC of PRACH through ADD PRACHASC, modify it through MOD PRACHASC, and remove it through RMV PRACHASC.
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Page55Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Access Control z Access Control is used by network operators to prevent
overload of radio access channels under critical conditions.
Access class 0~Access Class 9
Access class 11~Access Class 15
Access class 10
z The access class number is stored in the SIM/USIM.z Access class 0~9 are allocated to all the users. And the 10 classes show the same priority.z 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
z 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.
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Page56Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Mapping between AC and ASCz The AC-ASC mapping information is optional and used for
the System Information Block 5 (SIB5) only.
z Set the mapping between AC and ASC through ADD PRACHACTOASCMAP, modify it through MOD PRACHACTOASCMAP, and remove it through RMV PRACHACTOASCMAP.
57
START
Choose a RACH sub channel fromavailable ones
Get available signatures
Set Preamble Retrans Max
Set Preamble_Initial_Power
Send a preamble
Check the corresponding AI
Increase message part power by p-m based on preamble power
Set physical status to be RACHmessage transmitted Set physical status to be Nack
on AICH received
Choose a access slot again
Counter> 0 & Preamblepower-maximum allowed power
z Physical random access procedure 1. Derive the available uplink access slots, in the next full access slot set, for the set of
available RACH sub-channels within the given ASC. Randomly select one access slot among the ones previously determined. If there is no access slot available in the selected set, randomly select one uplink access slot corresponding to the set of available RACH sub-channels within the given ASC from the next access slot set. Therandom function shall be such that each of the allowed selections is chosen with equal probability
2. Randomly select a signature from the set of available signatures within the given ASC
3. Set the Preamble Retransmission Counter to Preamble_ Retrans_ Max 4. Set the parameter 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 Commanded Preamble Power D: Decrease the Preamble Retransmission Counter by one. If the Preamble
Retransmission Counter > 0 then repeat from step 6. 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 Signature
8. If a positive acquisition indicator corresponding to the selected signature is detected , Transmit the random access message three or four uplink access slots after the uplink access slot of the last transmitted preamble
9. Exit the physical random access procedure
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Page59Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
RRC Connection Message
z Typical RRC connection messages RRC_CONNECTION_REQUEST
RRC_CONNECTION_SETUP
RRC_CONNECTION_SETUP_COMPLETE
RRC_CONNECTION_RELEASE
z 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.
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Page60Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
UE Timers and Constants in Idle Mode
z T300
Parameter name: Timer 300 [ms]
Recommended value: D2000, namely 2000ms
z N300
Parameter name: Constant 300
Recommended value: 3
z T300 Parameter name: Timer 300[ms] 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 Content: T300 is started after the UE transmits the RRC CONNECTION REQUEST
message and stopped after the UE receives the RRC CONNECTION SETUP message. RRC CONNECTION REQUEST resents upon the expiry of the timer if V300 less than or equal to N300. Otherwise, the UE enters idle mode.
Recommended value: D2000. Set this parameter through SET IDLEMODETIMER, query it through SET
IDLEMODETIMER.z N300
Parameter name: Constant 300 Value range: 0~7 . Content: Maximum number of retransmission of RRC CONNECTION REQUEST . Recommended value: 3. Set this parameter through SET IDLEMODETIMER, query it through SET
IDLEMODETIMER.
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Page61Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
UE Timers and Constants in Idle Mode
z T312
Parameter name: Timer 312 [s]
Recommended value: 6, namely 6s
z N312
Parameter name: Constant 312
Recommended value: D1, namely 1
z T312 Parameter name: Timer 312[s] Value range: 1~15 . Physical value range: 1~15s Physical unit: s Content: T312 is started after the UE starts to establish a DCH and stopped when the
UE detects N312 consecutive "in sync" indications from L1. It indicates physical channel setup failure upon the expiry of the timer.
Recommended value: 6. Set this parameter through SET IDLEMODETIMER, query it through SET
IDLEMODETIMER.z N312
Parameter name: Constant 312 Value range: D1, D2, D4, D10, D20, D50, D100, D200, D400, D600, D800, D1000 . Physical value range: 1, 2, 4, 10, 20, 50, 100, 200, 400, 600, 800, 1000 Content: Maximum number of consecutive "in sync" indications received from L1. . Recommended value: D1. Set this parameter through SET IDLEMODETIMER, query it through SET
IDLEMODETIMER.
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Page62Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
RRC Connection Establish Channel Type and Bit Ratez RRCCAUSE
Parameter name: Cause of RRC connection establishment
Recommended value: none
z SIGCHTYPE
Parameter name: Channel type for RRC establishment
Recommended value: none
z RRCCAUSE Parameter name: Cause of RRC connection establishment Value range: ORIGCONVCALLEST, ORIGSTREAMCALLEST, ORIGINTERCALLEST,
ORIGBKGCALLEST, ORIGSUBSTRAFFCALLEST, TERMCONVCALLEST, TERMSTREAMCALLEST, TERMINTERCALLEST, TERMBKGCALLEST, EMERGCALLEST, INTERRATCELLRESELEST, INTERRATCELLCHGORDEREST, REGISTEST, DETACHEST, ORIGHIGHPRIORSIGEST, ORIGLOWPRIORSIGEST, CALLREEST, TERMHIGHPRIORSIGEST, TERMLOWPRIORSIGEST, TERMCAUSEUNKNOWN, DEFAULTEST.
Content: The cause of Rrc connection establishment. . Recommended value: none. Set this parameter through SET RRCESTCAUSE, query it through LST
RRCESTCAUSE.z SIGCHTYPE
Parameter name: Channel type for RRC establishment Value range: FACH, DCH_3.4K_SIGNALLING, DCH_13.6K_SIGNALLING. Content: FACH indicates that the RRC is established on the common channel.
DCH_3.4K_SIGNALLING indicates that the RRC is established on the dedicated channel of 3.4 kbit/s. DCH_13.6K_SIGNALLING indicates that the RRC is established on the dedicated channel of 13.6 kbit/s. .
Recommended value: none. Set this parameter through SET RRCESTCAUSE, query it through LST
RRCESTCAUSE.
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Page63Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
RRC Connection Establish Channel Type and Bit Ratez INTRAMEASCTRL
Parameter name: IntraMeas Ctrl Ind for RRC establishment
Recommended value: SUPPORT
z INTRAMEASCTRL Parameter name: IntraMeas Ctrl Ind for RRC establishment Value range: NOT_SUPPORT, SUPPORT. Content: NOT_SUPPORT indicates that the Intrafreq measurement control message
will be send in RRC Connection Establishment. SUPPORT indicates that the Intrafreqmeasurement control will not be send in RRC Connection Establishment.
Recommended value: SUPPORT . Set this parameter through SET RRCESTCAUSE, query it through LST
RRCESTCAUSE.
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WCDMA Power Control and Relevant Parameters
263
Page1Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Objectives
z Upon completion of this course, you will be able to:
Describe the purpose and function of power control
Explain open loop power control and parameters
Explain inner loop power control and relevant parameters
Explain outer loop power control and relevant parameters
264
Page2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Power Control Overview
2. Open Loop Power Control
3. Closed Loop Power Control
265
Page3Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Power Control Overview
2. Open Loop Power Control
3. Closed Loop Power Control
266
Page4Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Purpose of Uplink Power Control
z Uplink Transmission Character Self-interference system
Uplink capacity is limited by interference level
Near-far effect
Fading
z Uplink Power Control Function Ensure uplink quality with minimum transmission power
Decrease interference to other UE, and increase capacity
Solve the near-far effect
Save UE transmission power
z CDMA system have the embedded characteristics of self-interference, for uplink one users transmission power become interference to others.
z The more connected users, the higher interference. Generally the capacity is limited by interference level.
z WCDMA suffer from Near-far effect, which means if all UE use the same transmission power, the one close to the NodeB may block the entire cell.
z Uplink power control can guarantee the service quality and minimize the required transmission power. It will resolve the near-far effect and resist fading of signal propagation. By lowering the uplink interference level, the system capacity will be increased.
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Page5Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Purpose of Downlink Power Control
z Downlink Transmission Character Interference among different subscribers
Interference from other adjacent cells
Downlink capacity is limited by NodeB transmission power
Fading
z Downlink Power Control Function Ensure downlink quality with minimum transmission power
Decrease interference to other cells, and increase capacity
Save NodeB transmission power
z The downlink has different characteristics from the uplink, for downlink interference is caused by multi-path, part of one users power also become interference to others.
z Downlink power from adjacent cells also is one part of interference to the own cell.
z Transmission power of NodeB is shared by all users channels, so downlink capacity usually is considered to be limited by transmission power.
z Downlink power control also can guarantee the service quality and minimize the required transmission power, so the capacity is maximized in case that interference is lowered.
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Page6Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Effect of Power Control
Time (ms)0 200 400 600 800
-20
-15
-10
-5
0
5
10
15
20
Rel
ativ
e po
wer
(dB
)
Channel FadingTransmitting powerReceiving power
z Because of channel fading in mobile communication system, the radio signal is deteriorated and fluctuated, the fast power control become one key technology to resist this phenomenon.
z In this figure, the channel fading is compensated by the transmitting power, which is adjusted by the fast power control, so the receiving power is almost constant and the radio propagation condition is improved.
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Page7Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control Classification
z Open Loop Power Control
Uplink / Downlink Open Loop Power Control
z Closed Loop Power Control
Uplink / Downlink Inner Loop Power Control
Uplink / Downlink Outer Loop Power Control
z In WCDMA system, power control includes open loop and closed loop power control.
z Open loop power control is used to determine the initial transmission power, and the closed loop power control adjusts the transmission power dynamically and continuously during the connection.
z For uplink, the UEs transmission power is adjusted; and for downlink, the NodeBs transmission power is adjusted.
270
Page8Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control For Physical Channels
z Power control methods are adopted for these physical channels:
" can be applied, " not applied
SCH
PICHAICHPRACHSCCPCHPCCPCH
DPCCHDPDCH
Outer Loop Power Control
Inner Loop Power Control
No Power Control
Closed Loop Power ControlOpen Loop Power Control
Physical Channel
z Open loop power control is used in two cases:
1. to decide the initial transmission power of PRACH preamble.
2. to decide the initial transmission power of DPCCH / DPDCH.
z Closed loop power control is only applied on DPCCH and DPDCH
z For other common channels, power control is not applied, they will use fixed transmission power:
The PCPICH power is defined by the PCPICH TRANSMIT POWER parameter as an absolute value in dBm.
All other common channels power is defined in relation with the PCPICH TRANSMIT POWER parameter, and measured in dB.
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Page9Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Common Physical Channel Power Parameters
z MAXTXPOWER
Parameter name: Max transmit power of cell
The recommended value is 430, namely 43dBm
z PCPICHPOWER
Parameter name: PCPICH transmit power
The recommended value is 330, namely 33dBm
z MAXTXPOWER
Parameter name: Max transmit power of cell
Value Range: 0 to 500
Physical Value Range: 0dBm to 50 dBm, step 0.1dB
The recommended value is 430, namely 43dBm
Content: The sum of the maximum transmit power of all DL channels in a cell.
Set this parameter through ADD CELLSETUP, query it through LST CELL and modify it through MOD CELL
z PCPICHPOWER
Parameter name: PCPICH transmit power
Value Range: -100 to 500
Physical Value Range: -10dBm to 50 dBm, step 0.1dB
The recommended value is 330, namely 33dBm
Content: This parameter should be set based on the actual environment and the downlink coverage should be guaranteed firstly. If PCPICH transmit power is configured too great, the cell capacity will be decreased, for power resources is occupied by common channel and the interference to traffic channels is also increased.
Set this parameter through ADD PCPICH, query it through LST PCPICH and modify it through MOD CELL
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Page10Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Common Physical Channel Power Parameters
z PSCHPOWER or SSCHPOWER
Parameter name: PSCH / SCCH transmit power
The recommended value is -50, namely -5dB
z BCHPOWER
Parameter name: BCH transmit power
The recommended value is -20, namely -2dB
z PSCHPOWER or SSCHPOWER
Parameter name: PSCH / SCCH transmit power
Value range: -350 to 150.
Physical value range: -35 to 15, step 0.1dB
The recommended value is -50, namely -5dB
Content: The offset between the PSCH / SSCH transmit power and PCPICH transmit power.
For PSCH Power, set it through ADD PSCH, and query it through LST PSCH; for SSCH Power, set it through ADD SSCH, and query it through LST SSCH. And modify it through MOD CELL
z BCHPOWER
Parameter name: BCH transmit power
Value Range-350 to 150
Physical Value Range-35 to 15 dB, step 0.1dB
The recommended value is -20, namely -2dB
Content: The offset between the BCH transmit power and PCPICH transmit power.
Set this parameter through ADD BCH, query it through LST BCH, and modify it through MOD CELL
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Page11Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Common Physical Channel Power Parameters
z MAXFACHPOWER
Parameter name: Max transmit power of FACH
The recommended value is 10, namely 1dB
z PCHPOWER
Parameter name: PCH transmit power
The recommended value is -20, namely -2dB
z MAXFACHPOWER
Parameter name: Max transmit power of FACH
Value range : -350 to 150
Physical Value Range-35 to 15 dB, step 0.1dB
The recommended value is 10, namely 1dB
Content: The offset between the FACH transmit power and PCPICH transmit power.
Set this parameter through ADD FACH, query it through LST FACH, and modify it through MOD SCCPCH
z PCHPOWER
Parameter name: PCH transmit power
Value Range-350 to 150
Physical Value Range-35 to 15 dB, step 0.1dB
The recommended value is -20, namely -2dB
Content: The offset between the PCH transmit power and PCPICH transmit power.
Set this parameter through ADD PCH, query it through LST PCH, and modify it through MOD SCCPCH
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Page12Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Common Physical Channel Power Parameters
z AICHPOWEROFFSET
Parameter name: AICH power offset
The default value of this parameter is -6, namely -6dB
z PICHPOWEROFFSET
Parameter name: PICH power offset
The default value of this parameter is -7, namely -7dB
z AICHPOWEROFFSET
Parameter name: AICH power offset
Value Range -22 to 5
Physical Value Range -22 to 5 dB, step 1dB
The default value of this parameter is -6, namely -6dB
Content: The offset between the AICH transmit power and PCPICH transmit power.
Set this parameter through ADD CHPWROFFSET, query it through LST CHPWROFFSET, and modify it through MOD AICHPWROFFSET
z PICHPOWEROFFSET
Parameter name: PICH power offset
Value Range-10 to 5
Physical Value Range-10 to 5 dB , step 1dB
The default value of this parameter is -7, namely -7dB
Content: The offset between the PICH transmit power and PCPICH transmit power.
Set this parameter through ADD CHPWROFFSET, query it through LST CHPWROFFSET, and modify it through MOD PICHPWROFFSET
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Page13Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Power Control Overview
2. Open Loop Power Control
3. Closed Loop Power Control
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Page14Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. Open Loop Power Control
2.1 Open Loop Power Control Overview
2.2 PRACH Open Loop Power Control
2.3 Downlink Dedicated Channel Open Loop Power Control
2.4 Uplink Dedicated Channel Open Loop Power Control
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Page15Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Open Loop Power Control Overview
z Purpose
Calculate the initial transmission power of uplink / downlink channels
z Principle
Estimates the downlink signal power loss on propagation path
Path loss of the uplink channel is related to the downlink channel
z Application
Open loop power control is applied only at the beginning of connection
setup to set the initial power value.
z In downlink open loop power control, the initial transmission power is calculated according to the downlink path loss between NodeB and UE.
z In uplink, since the uplink and downlink frequencies of WCDMA are in the same frequency band, a significant correlation exists between the average path loss of the two links. This make it possible for each UE to calculate the initial transmission power required in the uplink based on the downlink path loss.
z However, there is 90MHz frequency interval between uplink and downlink frequencies, the fading between the uplink and downlink is uncorrelated, so the open loop power control is not absolutely accurate.
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Page16Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. Open Loop Power Control
2.1 Open Loop Power Control Overview
2.2 PRACH Open Loop Power Control
2.3 Downlink Dedicated Channel Open Loop Power Control
2.4 Uplink Dedicated Channel Open Loop Power Control
279
Page17Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control
5. Downlink Synchronization
UE Node BServing
RNC
DCH - FP
Allocate RNTISelect L1 and L2parameters
RRCRRC
NBAPNBAP3. Radio Link Setup Response
NBAPNBAP2. Radio Link Setup Request
RRCRRC7. CCCH: RRC Connection Set up
Start RX description
Start TX description
4. ALCAP Iub Data Transport Bearer Setup
RRCRRC9. DCCH: RRC Connection Setup Complete
6. Uplink Synchronization
NBAPNBAP8. Radio Link Restore Indication
DCH - FP
DCH - FP
DCH - FP
Open loop powercontrol of PRACH
1. CCCH: RRC Connection Request
z In access procedure, the first signaling RRC CONNECTION REQUEST is transmitted in message part on PRACH.
z Before PRACH message part transmission, UE will transmit PRACH preamble, and the transmission power of first preamble is calculated by this PRACH open loop power control.
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Page18Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control
z Initial Power Calculation for the First Preamble
When UE needs to set up a RRC connection, the initial power
of uplink PRACH can be calculated according to the following
formula:
Power Tx Initial gCalculatin For Value Constant+ceInterferen UL+CPICH_RSCP-Power Transmit PCPICH=ernitial_PowPreamble_I
z In this formula, where
PCPICH TRANSMIT POWER defines the PCPICH transmit power in a cell. It is broadcast in SIB5.
CPICH_RSCP means received signal code power, the received power measured on the PCPICH. The measurement is performed by the UE.
UL interference is the UL RTWP measured by the NodeB. It is broadcast in SIB7.
CONSTANT VALUE compensates for the RACH processing gain. It is broadcast in SIB5.
z The initial value of PRACH power is set through open loop power control. UE operation steps are as follows:
1. Read Primary CPICH DL TX power, UL interference and Constant valuefrom system information.
2. Measure the value of CPICH_RSCP;
3. Calculate the Preamble_Initial_Power of PRACH.
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PRACH Open Loop Power Control Parameters
z CONSTANTVALUE
Parameter name: Constant value for calculating initial TX
power
The recommended value is -20, namely -20dB
z CONSTANTVALUE
Parameter name: Constant value for calculating initial TX power
Value range : -35 ~ -10
Physical Value Range-35 to -10 dB
Content: It is used to calculate the transmit power of the first preamble in the random access process.
Recommended value: -20
Set this parameter through ADD PRACHBASIC, query it through LST PRACH, and modify it through MOD PRACHUUPARAS
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Page20Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control
z Timing relationship of PRACH and AICH
AICH
PRACH
1 access slot
p-a
p-m p-p
Pre-amble
Pre-amble
Message part
Acq. Ind.
z After UE transmit the first Preamble on PRACH, it will wait for the corresponding AI (Acquisition Indicator) on the AICH. The timing relationship of PRACH and AICH is shown in above figure.
z There will be 3 parameters used to define the timing relationship:
p-p: time interval between two PRACH preambles. p-p is not a fixed value, it is decided by selecting access slot of PRACH preambles,
Here p-p has one restriction, it must be longer than a minimum value p-p min , namely p-p p-p min.
p-a: time interval between PRACH preamble and AICH Acquisition Indicator. If UE sends the PRACH preamble, it will detect the responding AI after p-a time.
p-m: time interval between PRACH preamble and PRACH message part. If UE sends the PRACH preamble and receives positive AI from the AICH, it will send the message part after p-m time.
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PRACH Open Loop Power Control Parameters
z AICHTXTIMING
Parameter name: AICH transmission timing
Content:
When AICHTXTIMING = 0,
p-p,min = 15360 chips, p-a = 7680 chips, p-m = 15360 chips When AICHTXTIMING = 1,
p-p,min = 20480 chips, p-a = 12800 chips, p-m = 20480 chips The recommended value is 1
z Parameter AICHTXTIMING is used to define the set of p-p min, p-a, p-m.z AICHTXTIMING
Parameter name: AICH transmission timing
Value range0,1
Content:
When AICHTXTIMING = 0,
p-p,min = 15360 chips, p-a = 7680 chips, p-m = 15360 chips When AICHTXTIMING = 1,
p-p,min = 20480 chips, p-a = 12800 chips, p-m = 20480 chips Recommended value: 1
Set this parameter through ADD AICH, query it through LST AICH, and modify it needs de-activated the cell through DEA CELL. After the old configuration of AICH is deleted through RMV AICH , a new AICH can be established through ADD AICH
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Page22Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control
z Power Ramping for Preamble Retransmission
Power Ramp Step
Power Offset Pp-m
Preamble_Initial_Power
Message part
Pre-amblePre-
amble
Pre-amblePre-
amble
1 3 N2
z After UE transmit the first Preamble,
If no positive or negative AI on AICH is received after p-a time, UE shall increase the preamble power by POWER RAMP STEP, and
retransmit the preamble.
This ramping process stops until the number of transmitted preambles has reached the MAX PREAMBLE RETRANSMISSION within an access cycle, or when the maximum number of access cycles has reached MAX PREAMBLE LOOP.
If a negative AI on AICH is received by the UE after p-a time, which indicates rejection of the preamble, the UE shall wait for a certain
Back-off Delay and re-initiate a new random access process.
When a positive AI on AICH is received by UE after p-a time, it will transmit the random access message after the uplink access slot of
the last preamble.
The transmit power of the random access message control part should be POWER OFFSET higher than the power of the last transmitted preamble.
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Page23Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control Parameters
z POWERRAMPSTEP
Parameter name: Power increase step
The recommended value is 2, namely 2dB
z PREAMBLERETRANSMAX
Parameter name: Max preamble retransmission
The Recommended value is 20
z POWERRAMPSTEP
Parameter name: Power increase step
Value range : 1 to 8
Physical Value Range: 1 to 8 dB
Content: The power increase step of the random access preambles transmitted before the UE receives the acquisition indicator in the random access process.
Recommended value: 2
Set this parameter through ADD PRACHBASIC, query it through LST PRACH, and modify it through MOD PRACHUUPARAS
z PREAMBLERETRANSMAX
Parameter name: Max preamble retransmission
Value range : 1 to 64
Content: The maximum number of preambles transmitted in a preamble ramping cycle.
Recommended value: 20
Set this parameter through ADD PRACHBASIC, query it through LST PRACH, and modify it through MOD PRACHUUPARAS
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Page24Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control Parameters
z MMAX
Parameter name: Max preamble loop
The recommended value is 8
z NB01MIN / NB01MAX
Parameter name: Random back-off lower / upper limit
The recommended value: 0 for both NB01MIN / NB01MAX
z MMAX
Parameter name: Max preamble loop
Value range: 1 to 32
Content: The maximum number of random access preamble loops.
Recommended value: 8
Set this parameter through ADD RACH, query it through LST RACH, and modify it first de-activated the cell through DEA CELL, then MOD RACH.
z NB01MIN / NB01MAX
Parameter name: Random back-off lower / upper limit
Value range: 0 to 50
Content: The lower / upper limit of random access back-off delay.
The recommended value: 0 for both NB01MIN / NB01MAX
Set this parameter through ADD RACH, query it through LST RACH, and modify it first de-activated the cell through DEA CELL, then MOD RACH.
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Page25Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
PRACH Open Loop Power Control Parameters
z POWEROFFSETPPM
Parameter name: Power offset
The default value:
-3dB for signalling transmission;
-2dB for service transmission.
z POWEROFFSETPPM
Parameter name: Power offset
Value range: -5 to 10dB
Content: The power offset between the last access preamble and the message control part. The power of the message control part can be obtained by adding the offset to the access preamble power.
The recommended value of this parameter is -3dB for signalling transmission , and that -2dB for service transmission
Set this parameter through ADD PRACHTFC, query it through LST PRACH, and modify it de-activated the cell through DEA CELL . After the old configuration of PRACH is deleted through RMV PRACHTFC , a new parameters can be established through ADD PRACHTFC
z The PRACH message also consists of control part and data part, here the POWER OFFSET is the difference between the PRACH preamble and the message control part.
z The PRACH message uses GAIN FACTOR to set the power of control / data part: GAIN FACTOR BETAC ( c ) is the gain factor for the control part. GAIN FACTOR BETAD ( d ) is the gain factor for the data part.
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Page26Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. Open Loop Power Control
2.1 Open Loop Power Control Overview
2.2 PRACH Open Loop Power Control
2.3 Downlink Dedicated Channel Open Loop Power Control
2.4 Uplink Dedicated Channel Open Loop Power Control
289
Page27Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
DL DPDCH Open Loop Power Control
5. Downlink Synchronization
UE Node BServing
RNC
DCH - FP
Allocate RNTISelect L1 and L2parameters
RRCRRC
NBAPNBAP3. Radio Link Setup Response
NBAPNBAP2. Radio Link Setup Request
RRCRRC7. CCCH: RRC Connection Set up
Start RX description
Start TX description
4. ALCAP Iub Data Transport Bearer Setup
RRCRRC9. DCCH: RRC Connection Setup Complete
6. Uplink Synchronization
NBAPNBAP8. Radio Link Restore Indication
DCH - FP
DCH - FP
DCH - FP
1. CCCH: RRC Connection Request
DL DPDCH Open Loop Power Control
z According to the RRC connection establishment procedure, after RNC received the RRC CONNECTION REQUEST message, and NodeB set up the radio link for UE, then Iub interface resources is established between NodeB and RNC.
z When DCH-FP of Iub interface finished downlink and uplink synchronization, the downlink DPCH starts to transmit, and DPDCH initial transmission power is calculated through open loop power control.
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Page28Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
DL DPDCH Open Loop Power Control
z When a dedicated channel is set up, the initial power of
downlink DPDCH can be calculated according to the
following formula:
= Total
CPICH
CPICHDLInitial P)No/Ec(
P)NoEb(
WRP
z In this formula, where
R is the requested data bitrate by the user
W is the chip rate
(Eb/No)DL is the Eb/No target to ensure the service quality. RNC searches for the (Eb/No)DL dynamically in a set of pre-defined values according to specific cell environment type, coding type, bitrate, BLER target and etc.
(Ec/Io)CPICH is the CPICH signal quality measured by UE, then it is sent to RNC through RACH.
is the orthogonality factor in the downlink. In Huawei implementation, is set to 0.
Ptotal is the total carrier transmit power measured at the NodeB
z The initial transmission power of downlink DPDCH could be calculated through this formula, then, initial transmission power of downlink DPCCH can be obtained according to the power offset: PO1, PO2 and PO3.
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Page29Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
DL DPDCH Open Loop Power Control
Data1 TPC TFCI Data2 Pilot
DownlinkTransmit
Power
DPCCHDPDCH DPDCH DPCCH
PO2 PO1PO3
1 timeslot
z This figure shows the power offset of downlink DPCH :
PO1 is the power offset of DPCCH TFCI bits to DPDCH data bits.
PO2 is the power offset of DPCCH TPC bits to DPDCH data bits.
PO3 is the power offset of DPCCH Pilot bits to DPDCH data bits.
The values of PO1, PO2 and PO3 are configured on RNC.
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DL DPDCH Open Loop Power Control Parameter
z TFCIPO
Parameter name: TFCI power offset
The recommended value is 0, namely 0dB
z TPCPO
Parameter name: TPC power offset
The recommended value is 12, namely 3dB
z TFCIPO
Parameter name: TFCI power offset
Value range : 0 to 24
Physical value range: 0 to 6 dB, step: 0.25
Content: The offset of TFCI bit transmit power from data bit transmit power in each time slot of radio frames on DL DPCH
Recommended value: 0
Set this parameter through SET FRC, query it through LST FRC, and modify it through SET FRC
z TPCPO
Parameter name: TPC power offset
Value range : 0 to 24
Physical value range: 0 to 6 dB, step: 0.25
Content: The offset of TPC bit transmit power from data bit transmit power in each time slot of radio frames on DL DPCH
Recommended value: 12
Set this parameter through SET FRC, query it through LST FRC, and modify it through SET FRC
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Page31Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
DL DPDCH Open Loop Power Control Parameter
z PILOTPO
Parameter name: Pilot power offset
The recommended value is 12, namely 3dB
z PILOTPO
Parameter name: Pilot power offset
Value range : 0 to 24
Physical value range: 0 to 6 dB, step: 0.25
Content: The offset of pilot bit transmit power from data bit transmit power in each time slot of radio frames on DL DPCH
The recommended value is 12, namely 3dB
Set this parameter through SET FRC, query it through LST FRC, and modify it through SET FRC
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Page32Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Downlink Power Control Restriction
z The power of downlink dedicated channel is limited by an
upper and lower limit for each radio link.
The DL DPDCH power could not exceed Maximum_DL_Power,
nor could it be below Minimum_DL_Power.
z RLMAXDLPWR / RLMINDLPWR
Parameter name: RL Max / Min DL TX power
The recommended value is shown in the following table.
z Note: Both downlink open loop and close loop power control will be limited by this parameter.
z RLMAXDLPWR
Parameter name: RL Max DL TX power
Value range : -350 to 150
Physical Value Range-35 to 15 dB, step 0.1dB
Content: The maximum downlink transmit power of radio link. This parameter should fulfill the coverage requirement of the network planning, and the value is relative to [PCPICH transmit power]
Set this parameter through ADD CELLRLPWR , query it through LST CELLRLPWR, and modify it through MOD CELLRLPWR
z RLMINDLPWR
Parameter name: RL Min DL TX power
Value range : -350 to 150
Physical Value Range-35 to 15 dB, step 0.1dB
Content: The minimum downlink transmit power of radio link. This parameter should consider the maximum downlink transmit power and the dynamic range of power control, and the value is relative to [PCPICH transmit power].
Since the dynamic range of power control is set as 15dB, this parameter is recommended as [RL Max DL TX power] 15 dB.
Set this parameter through ADD CELLRLPWR, query it through LST CELLRLPWR, and modify it through MOD CELLRLPWR
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Page33Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Downlink Power Restriction Parameters
z Referential configurations for typical services:
8-114384 kbps
8-132256 kbps
16-150144 kbps
32-17-264 kbps
64-19-432 kbps
128-23-88 kbps
PS Domain
32-15064 kbps
32-15056 kbps
64-17-232 kbps
64-17-228 kbps
128-18-312.2 kbps AMR
CS Domain
Downlink SFRL Min Downlink Transmit PowerRL Max Downlink Transmit PowerService
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Page34Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
2. Open Loop Power Control
2.1 Open Loop Power Control Overview
2.2 PRACH Open Loop Power Control
2.3 Downlink Dedicated Channel Open Loop Power Control
2.4 Uplink Dedicated Channel Open Loop Power Control
297
Page35Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
UL DPCCH Open Loop Power Control
5. Downlink Synchroni