1. Idle Mode and Common Channel Behavior
EUS/WR/AE
Jul 22, 2005
Idle Mode and Common Channel Behavior
RAN Feature Presentation

2. Functions PLMN Selection Cell Selection / Reselection LA / RA Update
EUS/WR/AE
Ericsson Proprietary
9/15/2003
Jul 22, 2005
Functions
PLMN Selection
Cell Selection / Reselection
LA / RA Update
Paging
System Information
Rev A
RAN Feature Presentation 14

3. Automatic PLMN Selection
EUS/WR/AE
Jul 22, 2005
Automatic PLMN Selection
Last registered PLMN
Home PLMN
PLMN priority List from “user controlled” USIM
PLMN priority List from “operator controlled” USIM
Other PLMN where RSCP > -95 dBm in random order
Other PLMN where RSCP <= -95 dBm in descending order
If Not
Available
If Not
Available
If Not
Available
If Not
Available
If Not
Available
*In case HPLMN was not available for selection, it will be tried again in 30min. during national roaming (default)
RAN Feature Presentation

4. Initiate Cell Synchronization
EUS/WR/AE
Jul 22, 2005
Cell Search
P-CCPCH
(PSC + SSC + BCH)
Initiate Cell Synchronization
UE monitors Primary SCH code, detects peak in matched filter output
Slot Synchronization Determined >
UE monitors Secondary SCH code, detects SCG and frame start time offset
Frame Synchronization and Code Group Determined >
UE determines Scrambling Code by correlating all possible codes in group
Scrambling Code Determined >
UE monitors and decodes BCH data
BCH data, Super-frame synchronization determined >
Search allows the UE to acquire the slot and frame synchronization and to get the downlink primaryScramblingCode associated with the cell using the SCH.Following physical channel are involved in the search procedure: P-SCH, S-SCH and the CPICH (primary common control physical (PCCPCH)channel carrying all three). READ Synchronization Procedure
Slot Sync:correlating the information on the P-SCH with primary synchronization code, which is common to all cells
Frame and SC group: correlating the information on the S-SCH with all secondary synchronization code sequences and by detecting the peak value, since the cyclic shifts of sequences are unique.
Primary SC: correlating the CPICH with all codes within the scrambling code group identified in step 2. When the primary scrambling code has been identified, the Primary Common Control Physical Channel (P-CCPCH) will be detected and the UE is able to read the information on the BCCH.
UE adjusts transmit timing to match timing of BS Chips
Cell Synchronization complete
RAN Feature Presentation

5. EUS/WR/AE
Jul 22, 2005
Cell Selection
These 2 parameters allow the carrier to reserve or limit access to the cells in the network;
CellReserved  Reserved ; Not Reserved (If Reserved, there will be no service to UEs)
AccessClassNBarred  [ ] (Each bit corresponds to an Access Class)
RAN Feature Presentation

6. Cell Selection Squal = Qqualmeas – qQualMin
EUS/WR/AE
Ericsson Proprietary
9/15/2003
Jul 22, 2005
Cell Selection
Cell selection criteria: IF
Squal > 0
AND
Srxlev > 0
then cell selection criteria are met
CPICH Ec/No [dB] measured by UE
Sent on SIB3
CPICH RSCP [dBm] measured by UE
max(maxTxPowerUl - P, 0)
Squal = Qqualmeas – qQualMin
Srxlev = Qrxlevmeas – qRxLevMin - Pcompesation
Rev A
RAN Feature Presentation 14

7. Cell Reselection qHyst1 CPICH RSCP qOffset1sn CPICH RSCP
EUS/WR/AE
Jul 22, 2005
Cell Reselection
Cell Reselection happens;
When the UE is camped normally has found a better neighbouring cell than the cell on which it is camping
When the cell on which it is camping is no longer suitable
The cells to camp on are ranked based on R criteria;
R (serving) = Qmeas(s) + qHyst(s)
R (neighbour) = Qmeas(n) - qOffset(s,n)
qHyst1 CPICH RSCP qOffset1sn CPICH RSCP
qHyst2 CPICH Ec/No qOffset2sn CPICH Ec/No
QMeas can be either RSCP or Ec/No depending on the value of parameter QualMeasQuantity. For GSM cells it always is RSCP. For WCDMA it is Ec/No by default
RAN Feature Presentation

8. Cell Reselection WCDMA
EUS/WR/AE
Ericsson Proprietary
9/15/2003
Jul 22, 2005
Cell Reselection WCDMA
Serving cell
Neighbour 1
Neighbour 2
QHyst1
Qoffset1sn 3 2 1
treSelection
Measurement Quantity
ranking
Camp on Neigbour1
Same idea as in GSM, serving cells are favored while neighbors are penalized
RAN Feature Presentation
Rev A 14

9. Measurements in Idle Mode
EUS/WR/AE
Ericsson Proprietary
9/15/2003
Jul 22, 2005
Measurements in Idle Mode
UE starts Intra-frequency measurements if :
Squal<=sIntraSearch [2 dB]
UE starts Inter-Frequency measurements if :
Squal<=sInterSearch [2 dB]
UE starts GSM measurements if :
Squal<=sRATSearch [2 dB]
And/or
Srxlev<=sHcsRat [2 dB]
Rev A
RAN Feature Presentation 14

10. Cell Reselection IRAT EUS/WR/AE Jul 22, 2005 RAN Feature Presentation
treSelection (2 sec.)
RAN Feature Presentation

11. IeF & IRAT Measurements in Cell_FACH mode
EUS/WR/AE
Jul 22, 2005
IeF & IRAT Measurements in Cell_FACH mode
Measurements are controlled by 2 parameters in Cell_FACH mode;
interFreqFddMeasIndicator: TRUE or FALSE depending on presence of IeF neighbors
TRUE  UE will perform measurements and evaluate cell reselection criteria on IeF cells
FALSE  UE will not perform measurements and will not evaluate cell reselection criteria on IeF cells
fachMeasOccaCycLenCoeff = 4  with this setting the UE will leave the FACH channel every 16th frame to perform measurements on IeF or IRAT neighbors
(2fachMeasOccaCycLenCoeff = 24 = 16 (IeF or IRAT) or 23=8 (IeF and IRAT) )
RAN Feature Presentation

12. Mobility Management Registrations
EUS/WR/AE
Jul 22, 2005
Mobility Management Registrations
Location / Routing Area Update
A new cell w/ different LAC/RAC
Periodic Registration
LU is controlled by T3212 sent on BCCH
RU is controlled by T3312 (CN parameter)
IMSI attach/detach
During Switch on & off
LA and RA: Are where CN sends paging messages for the CS and PS network.
LA (LAI) = LAC+PLMN identity
RA (RAI)= LAI+RAC
RAN Feature Presentation

13. Paging UEs can be paged on;
EUS/WR/AE
Jul 22, 2005
Paging
UEs can be paged on;
Idle Mode (Type I)  via PICH & PCH [S-CCPCH]
Cell_FACH Mode (Type II)  via DCH
Cell_DCH Mode (Type II)  via DCH
Idle Mode Paging
PCH is only decoded when PICH indicates that there is a paging for UEs paging group
DRX (Discontinuous Reception) is used to limit battery consumption in idle mode
Frame with PI Indicator
Associated S-CCPCH frame
• • •
PICH
S-CCPCH
tPICH
RAN Feature Presentation

14. Master / System Information Blocks
EUS/WR/AE
Jul 22, 2005
Master / System Information Blocks
The UE reads the system information on the BCCH when the following events occur:
UE is powered up
UE changes cell in Idle mode or in state CELL_FACH
UE is informed of a change of System Information, when the UE is in Idle mode or state CELL_FACH
UE moves from dedicated mode to common mode
Timer expires for SIBs
Master Information Block
System Information Block 1
System Information Block 3
System Information Block n
The SIBs contain all information necessary for UEs to work properly in both Idle and Connected mode
Each SIB contains different kinds of information
Each SIB has its own repetition period (sibxRepPeriod)
The MIB has a fixed, predefined repetition rate equal to 80 ms
Regularly broadcast to the UE on the BCCH. It contains parameters related to functions such as Cell Selection and Reselection, Measurement Management, Location and Routing Registration, Handover, and Power Control.
The MIB is transmitted according to standardized scheduling parameters. A UE is always able to find the MIB on the BCCH and to get the scheduling information for the other SIBs
RAN Feature Presentation

15. Mapping of System Information onto MIB and SIBs
EUS/WR/AE
Jul 22, 2005
Mapping of System Information onto MIB and SIBs
Contents
MIB
SIB1
SIB3
SIB5
SIB7
SIB11
SIB12
PLMN Identity x
Cell selection and reselection parameters
Paging parameters
Measurement management
Cell and common channel configuration
Timers and counters in Idle mode
Power Control on common channel
Location and routing updating X
SIB Scheduling Information
A system information update can be triggered by, for example, measurement reports that affect the value of a broadcast system parameter. In addition, reconfiguration of system parameters, change of repetition rate for a SIB, and change of start position will trigger an update procedure.
When the system information is modified, the RNC sends the modified SIBs to the RBS. Subsequently, the RBS broadcasts these SIBs on the BCH. If the System
Information update is fail than RNC may attempt the new request information to the RBS for the Cell. RNC request update set by the parameter updateCellReattsNo
Once the max. number of reattempt is reached cell is blocked.
The MIB has a fixed, predefined repetition rate equal to 80 ms, corresponding to an 8-SFN period.
The UE reads the system information on the BCCH when the following events occur:
The UE is powered up.
The UE changes cell in Idle mode or in state CELL_FACH.
The UE is informed of a change of System Information, when the UE is in Idle mode or state CELL_FACH.
The UE moves from dedicated mode to common mode.
The timer expires for SIBs with an expiration timer as reread mechanism
RAN Feature Presentation