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

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

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

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 + 1.5 Chips Cell Synchronization complete RAN Feature Presentation

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  [0-65535] (Each bit corresponds to an Access Class) RAN Feature Presentation

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

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

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

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

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

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

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

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

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

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