HSPA Protocols

ObjectiveAt the end of the module the participant will be able to:

List the protocols used in HSDPA and HSUPA in layer 1, 2 and 3.

Describe function of each layer.

ContentProtocol Stack

Protocol Stack Enhancements with HSDPA

Protocol Stack Enhancements with HSUPA

Protocol Stack: ArchitectureVertical planes

Control Plane: for radio network controllingUser Plane: support data streams for user data

Protocol layers

Physical Layer: Layer 1Data Link Layer: layer 2Network Layer: layer 3

Physical Layer: transmission of data (bits)RLC: Radio Bearer ServicesMAC: Mapping Transport Channels Logical ChannelsSelection of transport formatTransport ChannelsRRC: Management of radio resources, e.g. mobility management PDCP: IP Header compressionControl PlaneUser PlaneControlPhysical ChannelsLogical ChannelsRadio Interface Protocol Architecture

Network LayerRRC (Radio Resource Control)

Broadcast non-access stratum, access stratum informationManage RRC connection between UE and UTRANRRC connection mobilityPagingManage radio resourceControl QoSMeasurement reportingOuter loop power controlControl ciphering

Data Link LayerPDCP (Packet Data Convergence Protocol)

Header compression/decompression.Transfer of user data.

RLC (Radio Link Control)

Transparent/Unacknowledged/Acknowledged transfer mode.

Data Link LayerMAC (Medium Access Control)

Mapping between logical and transport channels.Selection of appropriate transport format.Priority handling on common/shared channels.Identification of UEs on common/shared channels.Traffic volumn monitoring.Dynamic transport channel type switching.Ciphering for RLC transparent mode.

MAC Entities and Physical LayerMAC entities

MAC-b: for BCHMAC-c/sh: for PCH, FACH, RACHMAC-d: for DCH

Physical Layer

Transport data units via physical channels

Protocol Stack Enhancements with HSDPAEnhancements on physical layer

New MAC entity: MAC-hs

HS-DSCH Frame Protocol

RNCSGSNMAC-hsMAC-dRLCPDCPPS-RABPHYMAC-dRLCPDCPAAL5IPUDPGTP - UATMLayer 1RelayAAL5IPUDPGTP UATMLayer 1UEIu UPIu UPPHYPS-RABMAC-hsPHYPHYHS-DSCHFPNode BRelayHS-DSCHFPNewly introducedMinor changesNo changesUser Plane Changes Due to HSDPA

If there is DRNC:The Iub from DRNC contains MAC-c/sh (optional), HS-DSCH FP and PHY.The Iur from DRNC contains HS-DSCH FP and PHY.

See TS25.308.

Changes to Physical Layer in HSDPAIntroduction of HS-PDSCH and HS-DSCHFixed spreading factor 16 for HS-PDSCHMulti code transmissionShort TTI of 2 msLink Adaption per Adaptive Coding and ModulationIntroduction of 16QAM as new modulation methodIntroduction of Hybrid ARQIntroduction of new signaling channels to support scheduling and HARQ (HS-SCCH and HS-DPCCH)

Flow ControlMAC-hs / MAC-c/sh or MAC-hs / MAC-dScheduling / Priority HandlingHARQTo MAC-c/sh or MAC-dMAC-hsTFRC selectionAssociated UplinkSignalingHS-DSCHAssociated DownlinkSignalingMAC - ControlMAC-hs Function in UTRAN

DisassemblyReorderingReorderingRe-ordering queue distributionTo MAC-dMAC-hsDisassemblyHS-DSCHHARQAssociated Downlink Signaling HS-SCCHAssociated Uplink Signaling HS-DPCCHMAC - ControlMAC-hs Function in UE

RRC (Radio Resource Control)MAC (Medium Access Control)MAC-hsRLC (Radio Link Control)Physical LayerUERNCNodeBphysical layer L1data link layer L2network layer L3Iub Interface ProtocolsHSDPA:Introduction of MAC-hsRadio Interface Control Plane HSDPA

U-RNTI orC-RNTI B, CNode BSRNC

IubNode BDRNC

IubIurIuS-RNTID-RNTI

U-RNTI orC-RNTI A DCHDCH

HS-DSCHH-RNTIUE Identifier in UTRAN

Protocol Stack Enhancements with HSUPAChanges on physical layer

E-DCH FP

MAC-e in Node B and UE

MAC-es in RNC and UE

RNCSGSNMAC-dRLCPDCPPS-RABPHYMAC-dRLCPDCPAAL5IPUDPGTP - UATMLayer 1AAL5IPUDPGTP UATMLayer 1UEIu UPIu UPPHYPS-RABMAC-ePHYPHYE-DCHFPNode BRelayE-DCHFPNewly defined resp. introducedMinor changesNo changesMAC-es/eMAC esUser Plane Changes Due to HSUPA

If there is DRNC, the E-DCH FP is simply relayed between Iub and Iur.

MAC-e, MAC-es FunctionsMAC-e/es in UE

HARQ functionalityMultiplexingSelection of E-TFC

MAC-e in Node B

E-DCH schedulingHARQ functionalitySoft combining for intra Node B

MAC-es in RNC

ReorderingMacro diversity selection

www.If there is DRNC:The Iub from DRNC contains MAC-c/sh (optional), HS-DSCH FP and PHY.The Iur from DRNC contains HS-DSCH FP and PHY.

See TS25.308. Nokia Siemens Networks Author Presentation Departmentwww.If there is DRNC, the E-DCH FP is simply relayed between Iub and Iur. Nokia Siemens Networks Author Presentation Department