UMTS Network OverviewUMTS Network OverviewUMTS Radio InterfaceUMTS Radio Interface

Basic UMTS Call Flow & ladder DiagramBasic UMTS Call Flow & ladder DiagramLogical, Transport & Physical MappingLogical, Transport & Physical Mapping

RRC StatesRRC States

the mobile device can be located to a specific cell but it cannot transfer data and must be paged by the network (DRX Mode)

The URA is a new area that has been introduced into the UMTS network to complement the LA and RA, which are still used. Unlike the LA and RA, which are controlled from the core network, the URA is controlled within UTRAN. Each cell in the UTRAN will belong to at least one URA and the mobile device will be allocated a URA to which it is attached

dedicated physical channel is allocated for the mobile device in the uplink and downlink. The location of the device is known by its SRNC to a cell level.

This is ideal for such services as SMS and multimedia messaging service (MMS). The mobile device can monitor the BCH and may also be asked to use the CPCH to transfer data in the uplink. The UE must constantly monitor the FACH in the downlink.

Downlink

Uplink

RRC States ChangesRRC States ChangesUMTS & GSM UMTS & GSM CellsCells

RRC, PMM & SMRRC, PMM & SMState Change during Packet FlowState Change during Packet Flow

UE Initiated RRC State TransitionUE Initiated RRC State Transition

Downlink

Uplink

Network Initiated RRC State TransitionNetwork Initiated RRC State Transition

Initial Network AccessInitial Network Access

Downlink

Uplink

RAN Initial AccessRAN Initial AccessSlot / Frame Synchronization, Scrambling Code & BCCHSlot / Frame Synchronization, Scrambling Code & BCCH

RACH Initial Access ProcedureRACH Initial Access Procedure

System Information BroadcastSystem Information Broadcast

Downlink

Uplink

Basic UMTS Call Life CycleBasic UMTS Call Life Cycle

RRC Connection Establishment RRC Connection Establishment

CCCH/RACH/PRACH

CCCH/FACH/S-CCPCH

DCCH/RACH/PRACH

Downlink

Uplink

SRB, RB, signaling ConnectionSRB, RB, signaling Connection

UMTS Location UpdateUMTS Location Update

Downlink

Uplink

DCCH/DCH/DPDCH

UMTS Paging UMTS Paging Type 1 & 2Type 1 & 2

Downlink

Uplink

Type 1: UE with no FACH/DCH connection

Type 2: UE with existing RRC connection

MS Terminated Voice Call Est.MS Terminated Voice Call Est.

Downlink

Uplink

DCCH/DCH/DPDCH

IntraIntra--RNC Soft handoverRNC Soft handover

Circuit Call ReleaseCircuit Call Release

Packet Core EstablishmentPacket Core Establishment

Downlink

Uplink

DCCH/DSCH/DPSCH

SMS/MMS, CBC TrafficSMS/MMS, CBC Traffic

Downlink

Uplink