10 ra4121aen30gla0 idle mode mobility gc ppt

8/13/2019 10 RA4121AEN30GLA0 Idle Mode Mobility GC Ppt

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List of detected preambles: The eNB shall report a list of detected PRACHpreambles to higher layers. Higher layer utilize this info for the RACH procedure

Transport BLER: The ACK/ NACKs for each transmission of the HARQ process arereported to the MAC. Based on these ACK/NACKs the higher layers compute theBLER for RRM issues.

TA: The eNB needs to measure the initial timing advance (TA) of the uplink channelsbased on the RACH preamble

Average RSSI: Measured in UL by eNB. It can be used as a level indicator for the ULpower control. The RSSI measurements are all UE related and shall be separatelyperformed for ( TTI intervals)

UL data allocation (PUSCH)

UL control channel (PUCCH)

Sounding reference signal (SRS)

Average SINR: In UL the eNB measures SINR per UE. The average SINR can beused as a quality indicator for the UL power control


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CELL SELECTION

Upon PLMN selection, UE uses cell selection for fast cell searching to camp on. To

receive system information UE tunes to the control channels. This procedure isknown as "camping on the cell. The UE will then register its presence in the registration area of the chosen cell byNAS (Non Access Stratum) registration procedure.NAS registration procedure means the upper layer information is transmitted from UEto CN via AS (Access Stratum). The NAS offers the E-UMTS service to the users.The cell will be decided as suitable if it fulfils the cell selection criteria.The purpose of camping on a cell is: To enable UE reception of system information from the selected PLMN To allow UE an RRC connection, accessing the network on the cell control channel. To receive paging and respond to paging messages on a tuned control channel in the registration area. The PLMN knows the tracking area of the cell in which theregistered UE is camped.

PLMN SELECTION

UE scans RF channels in the eUTRAN band according to its capabilities to find available PLMNs.

On each carrier, the UE searches for the strongest cell

If the UE can read the PLMN identity (from SIB), the PLMN and the measured signal strength is reportedto the NAS

After selecting a PLMN, the cell selection process starts where the UE selects a suitable cell and theradio access mode based on idle mode measurements and cell selection criteria.


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dlCarFrqUtra

pMaxUtraqRxLevMinUtra

uCelResPrio

utraFrqThrH

utraFrqThrL



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E-UTRAN coverage must be overlapped by GERAN or UTRAN coverage

Having terminated CS call, the UE may either stay in current RAT or go back to E-UTRAN using existing mechanisms

PS services may be provided in parallel to the CS call depending on the DTMcapability of the UE and target RAT

Evolved Packet Core (EPC) must support CS inter-working for mobility management andpaging

SGs interface between MME and MSC server is needed

interworking between SGSN and MME and PDN-GW is realized via pre-Rel.8 Gninterface

CS domain must support CS Fallback, i.e. MSC must support SGs interface to MME


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10 ra4121aen30gla0 idle mode mobility gc ppt

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