C19 WCDMA RAN Interface and Procedure

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WCDMA RAN Interface and Procedure

Transcript of C19 WCDMA RAN Interface and Procedure

  • WCDMA RAN Interface and Procedure

  • Course ContentsChapter 1 UTRAN Network ArchitectureChapter 2 UTRAN Interface Protocol and FunctionsChapter 3 Basic Signaling Process

  • UMTS System ArchitectureIuUTRANUEUuUTRANUMTS Terrestrial Radio Access NetworkCNCore NetworkUEUser Equipment CN

  • UTRAN System ArchitectureRNSRNCCore NetworkNode BNode BNode BNode BIuIuIurIubIubIubIub

  • Common Protocol Model of UTRAN InterfacesThe principle of interface protocol architecture is the logical mutual-independence between layers and planes. Protocol layers of a specified protocol version, or even all layers in a plane can be modified if required in the future.

  • Basic NotionsUE Working Mode and StateServing RNCDrift RNC and Control RNC Source RNC and Target RNC

  • UE Working Modes and statesIdle ModeIn standby state with no service conductedNo connection to UTRANThere is no information related to this UE in UTRANConnected Mode (Cell-DCH, Cell-FACH, Cell-PCH, URA-PCH)Cell-DCHIn active stateCommunicating via its dedicated channels UTRAN knows which cell UE is in.

  • Cell-FACH and Cell-PCH StateCell-FACHIn active stateFew data to be transmitted both in uplink and in downlink. There is no need to allocate dedicated channel for this UE. Downlink uses FACH and uplink uses RACH. UE need to monitor the FACH for its relative information. UTRAN knows which cell UE is in. Cell-PCHNo data to be transmitted or received. Monitor PICH, to receive its paging. lower the power consumption of UE.UTRAN knows which cell UE is in.UTRAN have to update cell information of UE when UE roams to another cell

  • URA-PCH StateURA-PCHNo data to be transmitted or received. Monitor PICH. to enter the non-consecutive state.UTRAN only knows which URA (UTRAN Registration Area, which consists of multiple cells) that UE is in.UTRAN update UE information only after UE has roamed to other URA. A better way to lower the resource occupancy and signaling transmission

  • UE states- Scanning networks (PLMN)- Camp on cell- Monitor paging channel- cell re-selection- Dedicated Channel- Radio bearers Transmission Services- upper layer Signalingtrigger (CN)- Reduce actionDTXand save powerRRC connection

  • SRNC/DRNCIn WCDMA system notion of SRNC/DRNC is introduced because the existence of Iur InterfaceSRNC and DRNC are related to a specific UE. They can be regarded as logical notionsIn brief, the RNC directly connected to CN and controlling all the UEs resources is called SRNC(serving RNC) of this UEThe RNC with no connection to CN but only providing resources for UE is called DRNC(Drift RNC) of this UEA UE in connection state has at least and only one SRNC, but can has 0 or multiple DRNCs

  • CRNCCRNC is related to a specific NodeB (or Cell)The RNC connected directly to a NodeB and controlling the usage of its resources is called the CRNC of this NodeBThere is and only one Controlling RNC for any NodeBCRNC is in charge of the allocation and usage of NodeBs resources

  • Source RNC/Target RNCSRNC Relocation is the process of switching the SRNC of a specific UE. Source RNC is the SRNC before SRNC Relocation and Target RNC is the SRNC after SRNC Relocation Source RNC and Target RNC refer to different RNCs during a SRNC Relocation process

  • Course ContentsChapter 1 UTRAN Network ArchitectureChapter 2 UTRAN Interface Protocol and FunctionsChapter 3 Basic Signaling Process

  • UTRAN Interface Protocols and FunctionsIu InterfaceIur InterfaceIub InterfaceUu Interface

  • Iu Interface System Structure

  • Iu-CS Interface Protocol Stack Structure

  • Iu-PS Interface Protocol Stack Structure

  • Iu Interface Functions(1)Mobility ManagementLocation Area ReportSRNS RelocationHard handover between RNCs and inter-system handoverRadio Access BearerRABManagementEstablishment, Modification and Release of RABIu data transmissionnormal data transmissionabnormal data transmissionTransparent transmission of UE-CN connection information

  • Iu Interface Functions(2)PagingIu ReleaseSecurity Mode ControlOverload ControlCommon UE IDIMSIManagementIu Signaling Trace ManagementIu Interface Abnormality ManagementCBS(Cell Broadcast Service) Control

  • UTRAN Interfaces Protocols and FunctionsIu InterfaceIur InterfaceIub InterfaceUu Interface

  • Iur Interface Protocol Stack Structure

  • Iur Interface Functions(1)Support Basic Mobility Functions between RNCsSupport SRNC relocationCell Update and URA Update between RNCsPaging between RNCsProtocol Error ReportDedicated Channel FunctionsEstablish, Modify or Release Dedicated Channels in DRNC during handoverTransmission of DCH TB(Transmission Block) on IurManagement of RL(Radio Link) in DRNS by Dedicated Measurement Procedure and Filter ControlRL ManagementCompressed Mode Management

  • Iur Interface Functions(2)Common Channel FunctionsEstablishment, Deletion of Common transport Channels on IurCommon Transport Channels are used to Transmit UE information which is in Common Channel state in DRNC Separate MAC-d From MAC-cTraffic Control Between MAC-d and MAC-cGlobal Resource ManagementCommon Measurement Between RNCsTransmission of Node B Timing Information between RNCs

  • UTRAN Interfaces Protocols and FunctionsIu InterfaceIur InterfaceIub InterfaceUu Interface

  • Iub Interface Protocol Stack

  • Iub Interface Functions(1)Common FunctionsCommon Transport Channel ManagementIub Common Channel Data TransmissionLogical O&M of Node Bmaintenance functions such as cell configuration ManagementFault ManagementBlock Management, etc.System Information ManagementCommon MeasurementResource VerificationAbnormality ManagementTiming and Synchronization Management

  • Iub Interface Functions(2)Dedicated FunctionsDedicated Transport Channel Management Radio Link(RL) Monitoring Dedicated Measurement ManagementTiming and Synchronization ManagementUp-link outer loop Power ControlIub Dedicated Data transmissionBalance on down-link power driftingCompressed Mode Control

  • UTRAN Interfaces Protocols and FunctionsIu InterfaceIur InterfaceIub InterfaceUu Interface

  • Uu Interface Protocol Stack Structure

  • Uu Interface L1 Functions(1)Multiplexing of transport channels and de-multiplexing of encoded composite channelsMapping of encoded composite transport channels on physical channelsMacro-diversity distribution/combining and soft handover executionError detection on transport channels and indication to higher layersFEC encoding/decoding and interleaving/de-interleaving of transport channelsRate matching of coded transport channels to physical channelsPower weighting and combining of physical channels

  • Uu Interface L1 Functions(2)closed-loop power controlopen-loop power controlModulation and spreading/demodulation and de-spreading of physical channelsSynchronization between frequency and time (chip, bit, slot, frame)Radio characters measurements (FER, SIR, Interference power) and indication to higher layersCompressed mode supportDiversity of Transmission/ReceivingOther base band processing functions

  • MAC: Medium Access Control

  • MAC Functionsmapping between logical channels and transport channelsselection of appropriate Transport Format for each Transport Channel depending on instantaneous data ratepriority handling between data flows of one UEpriority handling between UEs by dynamic schedulingidentification of UEs on common transport channels multiplexing/demultiplexing of higher layer PDUs into/from transport block sets delivered to/from the physical layer on common and dedicated transport channelstraffic volume monitoringDynamic Transport Channel type switching ciphering for transparent RLC

  • MAC: Mapping of Logical Channels(UE)

  • MAC: Transport Format Selection(1)Control immediate bit rate by means of changing traffic per TTI(Transmission Time Interval, is multiple of 10ms)Transport Block (TB): The basic unit exchanged between L1 and MAC Transport Block Size: the number of bits in a Transport Block Transport Block Set: A set of TBs transmitted in a TTITransport Block Set Size: the number of bits in a Transport Block Set

  • MAC: Transport Formation Selection(2)Transport Format (TF) defines Transport Block Set (Transport Block Size, Transport Block Set Size,TTI,FEC type,size of CRC)Transport Format Set (TFS): Possible TF combinations of a transport channel. MAC will chose a TF during every TTITransport Format Combination (TFC): Determined TF combination in each TTI, each transport channelTransport Format Combination Set (TFCS): define all possible TFC combination method. Thus MAC can process dynamic transport rate control in different transport channels

  • RLC: Radio Link Control AS L2 GC Nt DC RRC(L3) RLC PHY(L1) PDCP BMC MAC Control SAP's Control SAP Radio (Access) Bearers Logical Channels Transport Channels PhysicalChannels

  • RLC FunctionsSegmentation, reassembly and Padding Transmission of user data Error correction using different transport Format In-sequence delivery of higher layer PDUs, duplicate detection Flow control Sequence number check in Unacknowledged ModeUM Protocol error detection and recovery Ciphering Suspend/resume function

  • PDCPPacket Data Convergence ProtocolBMCBroadcast/Multicast Control AS L2 GC Nt DC RRC(L3) RLC PHY(L1) PDCP BMC MAC Control SAP's Control SAP Radio (Access) Bearers Logical ChannelsTransport ChannelsPhysicalChannels

  • PDCP FunctionsMapping of network PDU from network protocol to RLC protocol entity.header compression and de-compression in order to reduce the redundant control information in higher layer data, thus enhance the tran