1) The document discusses various states and procedures in LTE including UE states, PLMN selection, idle and connected mode procedures, cell selection and reselection processes, system information block messages, and mobility events. 2) Key UE states include EMM registered, EMM de-registered, and ECM idle/connected states. Cell selection is based on measurements of the S-criterion while cell reselection considers factors like signal level compensation and cell ranking criteria. 3) System information blocks provide parameters for functions like neighboring cell measurement, priority settings for inter-frequency/RAT reselection, and thresholds for mobility events during connected mode.

1. LTE PRE-LAUNCH

2. UE STATES
EMM Registered
EMM De-Registered
ECM IDLE
PLMN
Selection
UE Position unknown
EPC : Evolved Packet Core
EMM : EPC Mobility Management
ECM : EPC Connection Management

3. IDLE MODE PROCEDURES

4. PLMN SELECTION
PLMN Priority
Home PLMN
PLMN’s in USIM
Operator Controlled PLMN’s
Other PLMN’s according to RSRP

5. UE STATES
EMM Registered
EMM De-Registered
EPC : Evolved Packet Core
EMM : EPC Mobility Management
ECM : EPC Connection Management
Attach Accept
RRC
IDLE
ECM IDLE ECM Connected
RRC
CONNECTED
Connection Establishment
Connection Release
Cell Selection and Re-Selection
Tracking area updates
Paging
SIB Broadcast
Connected Mode Mobility
Handovers: INTRA, INTER, IRAT
PLMN
Selection

6. SIB MESSAGES
 MIB : Master Information Block: Most essential parameters
 SIB 1: Cell access related parameters and scheduling
 SIB 2: Common and shared channel configuration
 SIB 3: Parameters required for intra-frequency cell reselections
 SIB 4: Information on intra-frequency neighboring cells
 SIB 5: Information inter-frequency neighboring cells
 SIB 6: Information for reselection to UMTS (UTRAN) cells if no suitable LTE cell
is available
 SIB 7: Information for reselection to GSM (GERAN) cells if no suitable LTE or
UMTS cell is available
 SIB 8: Information for reselection to CDMA2000 systems (mostly for North
America)
 SIB 9: Home eNodeB name – for future LTE femto cell applications
 SIB 10 + 11: ETWS (Earthquake and Tsunami Warning System) information

7. SIB MESSAGES
System Information Scheduling Configuration

8.  Cell selection consists of the UE searching for the strongest cell on all supported carrier
frequencies, of each supported RAT until it finds a suitable cell.
 The cell selection criterion is known as the S-criterion and is fulfilled when the cell selection
receive level value Srxlev > 0
Srxlev = Qrxlevmeas − (Qrxlevmin − Qrxlevminoffset)
Srxlev is the Signal level compensation
Qrxlevmeas is the measured cell receive level value, also known as the RSRP
Qrxlevmin is the minimum required receive level in the cell.
Qrxlevminoffset is an offset which may be configured to prevent ping-pong between PLMNs.
SIB 1 provides parameters for Cell Selection.
Default value for qrxlevmin = -120dbm.
CELL SELECTION

9. CELL RESELECTION (INTRA-LTE)
SIB3
allowedMeasBandwidth
cellReselectionInfoCommon
cellReselectionServingFreqInfo
intraFreqcellReselectionInfo
p-Max
q-Hyst
q-offset
q-QualMin
q-RxLevMin
s-IntraSearch
s-NonIntraSearch
threshServingLow
t-ReselectionEUTRA
eNodeB Serving
 The UE makes measurements of attributes of the serving and neighbor cells
to enable the reselection process.
If ServingCell <= S intrasearch, UE shall perform intra-frequency measurements.
Reselection occurs with the fulfillment of cell Ranking Criteria (R).
eNodeB Neighbour
If Rs < Rn then reselect
Rs = Q measS + Qhyst
Rn = QmeasN - Qoffset

10. SIB5
InterFreqCarrierFreqList
InterFreqCarrierFreqInfo
dl-CarrierFreq, q-RxLevMin,
p-Max
t-ReselectionEUTRA
t-ReselectionEUTRA-SF
threshX-High, threshX-Low
allowedMeasBandwidth
cellReselectionPriority
neighCellConfig, q-OffsetFreq
interFreqNeighCellList
interFreqBlackCellList
InterFreqNeighCellInfo
physCellId
q-OffsetCell
CELL RESELECTION (INTER FREQ LTE)
eNodeB Serving
 The UE makes measurements of attributes of the serving and neighbor cells
to enable the reselection process.
If ServingCell <= S intrasearch, UE shall perform intra-frequency measurements.
Reselection occurs with the fulfillment of cell Ranking Criteria (R).
SIB 5 provides LTE cell reselection priorities.
eNodeB Neighbour
If Rs < Rn then reselect
Rs = Q measS + Qhyst
Rn = QmeasN - Qoffset

11. CELL RESELECTION (INTER RAT)
 The UE makes measurements of attributes of the serving and neighbor cells to enable the reselection process.
If ServingCell <= S nonintrasearch, UE shall perform intra-frequency measurements.
Reselection occurs with the fulfillment of cell Ranking Criteria (R).
SIB 6 provides UMTS cell reselection priorities.
SIB 7 provides GSM cell reselection priorities.
eNodeB Serving
NodeB Neighbour
If Rs < Rn then reselect
Rs = Q measS + Qhyst
Rn = QmeasN - Qoffset

12. CELL RESELECTION (INTER RAT)
SIB 6 : Example

13. UMTS TO LTE RESELECTION
 UE reselects to LTE ONLY WHEN UE IS IN IDLE MODE.
 UE shall perform reselection when measured RSRP goes higher than
threshXhigh.
 SIB 19 provides the parameters for reselection.
UMTS NodeB Serving
eNodeB Neighbour
UE should be in
IDLE MODE

14. CONNECTED MODE PROCEDURES

15. LTE - ATTACH
The following are required for initial attach to the LTE network:
 The Master Information Block (MIB), which includes a limited number of the most frequently
transmitted parameters which are essential for a UE’s initial access to the network.
 System Information Block Type 1 (SIB1), which contains parameters needed to determine if a cell
is suitable for cell selection, as well as information about the time domain scheduling of the other
SIBs.
 System Information Block Type 2 (SIB2), which includes common and shared channel
information.
UE eNB
Master Information Block
SIB 1
SIB 2
MIB
• DL bandwidth
SIB 1:
• PLMN ID
• TAC
• PCI
• Scheduling info for SIB2
SIB 2:
• Common Channel Info
• RACH info
• Random Access preamble
info
•T300 value

16. LTE - ATTACH
RRC Connection Request
 UE starts T300 timer after sending RCC
connection request.
 Value of T300 is available in SIB2.
 T300 value determines how long to wait to
get a response from eNB.
 Upon receiving RRC connection Setup, UE
stops T300 timer.
 UE send RRC Connection setup Complete
to make its transition to Connected mode.
RRC Connection Setup Complete

17.  Event A1: Serving becomes better than absolute threshold.
 Event A2: Serving becomes worse than absolute threshold.
 Event A3: Neighbour becomes amount of offset better than serving.
 Event A4: Neighbour becomes better than absolute threshold.
 Event A5: Serving becomes worse than absolute threshold1 AND Neighbour becomes better
than another absolute threshold2.
 Event B1: Neighbour becomes better than absolute threshold;
 Event B2: Serving becomes worse than absolute threshold1 AND Neighbour becomes better
than another absolute threshold2.
LTE EVENTS
Connected mode mobility is handled by LTE events.