UMTS Terrestrial Radio Access Network (UTRAN) .UMTS Terrestrial Radio Access Network (UTRAN)

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Transcript of UMTS Terrestrial Radio Access Network (UTRAN) .UMTS Terrestrial Radio Access Network (UTRAN)

  • UMTS Terrestrial Radio Access Network (UTRAN)

    UTRAN Architecture and Protocols

    UMTS Terrestrial Radio Access (UTRA)

    UTRAN Procedures (see separate presentation)

  • Cellular Communication Systems 2 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Important References Books: Kaaranen, Ahtiainen, Laitinen, Naghian, Niemi: UMTS Networks

    Architecture, Mobility and Services. 2nd edition, Wiley, 2005 Holma, Toskala: WCDMA for UMTS. 4th edition, Wiley, 2007 Walke, Althoff, Seidenberg: UMTS Ein Kurs. 2. Auflage, J. Schlembach

    Fachverlag, 2002 T. Benkner, C. Stepping: UMTS Universal Mobile Telecommunications

    System. J. Schelmbach Fachverlag, 2002.

    Central 3GPP Documents on UTRAN: 25.401: UTRAN overview 25.301: Radio link protocols (UTRA) 25.931: UTRAN procedures

  • Cellular Communication Systems 3 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    UTRAN Architecture

    Part 1: UTRAN Components and Interfaces UTRAN Functions

  • Cellular Communication Systems 4 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    UTRAN Components and Interfaces

    RNS

    RNC

    RNS

    RNC

    Core Network

    Node B Node B Node B Node B

    Iu Iu

    Iur

    Iub Iub Iub Iub

    UTRAN

    Source: 3GPP 25.401

    A Radio Network Subsystem (RNS) consists of a RNC and a number of Node Bs

  • Cellular Communication Systems 5 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    UTRAN Architecture Principles User Plane

    Source: 3GPP 25.401

    Non-Access Stratum: Protocols between UE and CN that are not

    terminated in the UTRAN Access Stratum: Provides UE-CN transport service to NAS services AS protocols are closely linked to radio technology

    UTRAN UE CN

    Access Stratum

    Non-Access Stratum

    Radio (Uu)

    Iu

    Radio proto- cols (1)

    Radio proto- cols (1)

    Iu protocols (2)

    Iu protocols (2)

    radio access bearer SAPs (user plane)

  • Cellular Communication Systems 6 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    UTRAN Architecture Principles Control Plane

    UTRAN UE CN

    Access Stratum

    Non-Access Stratum

    Radio (Uu)

    Iu

    Radio proto- cols (1)

    Radio proto- cols (1)

    Iu protocols (2)

    Iu protocols (2)

    CM,MM,GMM,SM (3)

    CM,MM,GMM,SM (3)

    Source: 3GPP 25.401

    Non-Access Stratum control plane functions: CM: Connection Management MM: Mobility Management GMM: GPRS MM SM: Session Management

    signaling connection

  • Cellular Communication Systems 7 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    UTRAN Functions (1) - Transfer of User Data - Functions related to overall system access control

    - Admission Control - Congestion Control - System information broadcasting

    - Radio channel ciphering and deciphering - Integrity protection - Functions related to mobility

    - Handover - SRNS Relocation - Paging support - Positioning

    - Synchronisation

    Source: 3GPP 25.401, Ch 7

  • Cellular Communication Systems 8 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    UTRAN Functions (2) - Functions related to radio resource management and control

    - Radio resource configuration and operation - Radio environment survey - Combining/splitting control - Connection set-up and release - Allocation and deallocation of radio bearers - Radio protocols function - RF power control - Radio channel coding and decoding - Channel coding control - Initial (random) access detection and handling - CN distribution function for Non Access Stratum messages

    - Functions related to broadcast and multicast services (broadcast/multicast interworking function BM-IWF)

    - Broadcast/Multicast Information Distribution - Broadcast/Multicast Flow Control - Cell-based Services (CBS) Status Reporting

    - Tracing - Volume reporting

  • Cellular Communication Systems 9 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Functions located inside/outside AS Source: 3GPP TS 23.110, Release 9

    LOCATION\ FUNCTION Outside the Access Stratum Inside the Access Stratum

    Call set up/release yes no

    (Connection) Bearer Set-Up Release CN bearer [tbd] Radio Access Bearer [tbd]

    Supplementary Services yes no

    Location management yes (IWF/CN related) yes (Radio related)

    Attach/ Detach yes FFS, Contr expected

    Resource Management yes (for NAS resource) yes (for AS resource incl. radio)

    Handover yes* yes

    Macrodiversity [ffs] yes* yes

    Encryption yes yes**

    Authentication yes no

    compression (non source dependent) yes yes

    source dependent coding yes no

    radio channel coding (could be many) no yes (could be many)

    UE location identification may be supported yes

    Charging yes no

    NOTE *: Optionally execution. In some CNs, it may not be present but not full service will be supported (e.g. limited to RLL type of service).

    NOTE **: Contributions expected to clarify the role between encryption and subscriber data.

    o

  • Cellular Communication Systems 10 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Radio Interface Protocols UMTS Terrestrial Radio Access (UTRA)

    Air interface protocol architecture

    Layer 1, 2 and 3 protocols

    Mapping between logical, transport and physical channels

  • Cellular Communication Systems 11 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Radio Protocols Overview

    RLC

    RRC

    L1

    GMM /SM / SMS

    RRC

    MAC

    ATM

    RANAP

    AAL5

    Relay

    ATM

    AAL5

    3G SGSNRNSMSIu-PsUu

    RLC SCCP

    SignallingBearer

    MAC

    L1

    SignallingBearer

    RANAP

    SCCP

    GMM /SM / SMS

    L1

    RLC

    PDCP

    MAC

    E.g., IP,PPP

    Application

    L1

    RLC

    PDCP

    MAC

    ATM

    UDP/IP

    GTP-U

    AAL5

    Relay

    L1

    UDP/IP

    L2

    GTP-U

    E.g., IP,PPP

    3G-SGSNUTRANMSIu-PSUu Gn Gi

    3G-GGSN

    ATM

    UDP/IP

    GTP-U

    AAL5

    L1

    UDP/IP

    GTP-U

    L2

    Relay

    Layer 3

    IP, PPP (user plane) RRC (control plane)

    Layer 2 PDCP (user plane) BMC (user plane) RLC MAC

    Layer 1 PHY

    See 3GPP 25.301 and UMTS Networks book, ch. 9

    Control plane

    User plane

  • Cellular Communication Systems 12 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Source: 3GPP 25.301

    Radio Access Bearers AS control plane SAPs

    Radio Protocol Architecture

    L3

    cont

    rol

    cont

    rol

    cont

    rol

    cont

    rol

    Logical Channels

    Transport Channels

    C-plane signalling U-plane information

    PHY

    L2/MAC

    L1

    RLC

    DC Nt GC

    L2/RLC

    MAC

    RLC RLC

    RLC RLC

    RLC RLC

    RLC

    BMC L2/BMC

    control

    PDCP PDCP L2/PDCP

    Radio Bearers

    RRC

  • Cellular Communication Systems 13 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    L3

    cont

    rol

    cont

    rol

    cont

    rol

    cont

    rol

    Logical Channel

    Transport Channels

    C-plane signalling U-plane information

    PHY

    L2/MAC

    L1

    RLC

    DC Nt GC

    L2/RLC

    MAC

    RLC RLC

    RLC RLC

    RLC RLC

    RLC

    Duplication avoidance

    UuS boundary

    BMC L2/BMC

    control

    PDCP PDCP L2/PDCP

    DC Nt GC

    Radio Bearers

    RRC

    Radio Access Bearers AS control plane SAPs Physical Layer Services

    Transport channels do not define what is transported (which is defined by logical channels)

    Example: DCH offers the same type of service for control and user traffic

    Physical layer offers information transfer services (transport channels) to MAC and higher layers Physical layer transport services define

    how and with what characteristics data are transferred over the radio interface

  • Cellular Communication Systems 14 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Radio Access Bearers AS control plane SAPs

    L3

    cont

    rol

    cont

    rol

    cont

    rol

    cont

    rol

    Logical Channel

    Transport Channels

    C-plane signalling U-plane information

    PHY

    L2/MAC

    L1

    RLC

    DC Nt GC

    L2/RLC

    MAC

    RLC RLC

    RLC RLC

    RLC RLC

    RLC

    Duplication avoidance

    UuS boundary

    BMC L2/BMC

    control

    PDCP PDCP L2/PDCP

    DC Nt GC

    Radio Bearers

    RRC

    Physical Layer Channel Types common transport channels (there is a need for inband

    identification of the UEs when particular UEs are addressed) dedicated transport channels (the UEs are identified by the physical

    channel, i.e. code and frequency for FDD (code, time slot and frequency for TDD))

  • Cellular Communication Systems 15 Andreas Mitschele-Thiel, Jens Mueckenheim Oct-15

    Physical Layer Common Transport Channels (1)

    Random Access Channel (RACH) Contention based uplink channel used for transmission of relatively

    small amounts of data, e.g. for initial access or non-real-time dedicated control or traffic data

    Forward Access Channel (FACH) Common downlink channel for relatively small amount of data no closed-loop power control

    Downlink Shared Channel (DSCH) TDD only Downli