Utran Concepts

Slide titleIn CAPITALS

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RNC - AN INTRODUCTION


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UTRAN TOPOLOGY

Top right corner for field-mark, customer or partner logotypes. See Best practice for example.

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Bullets level 2-520 pt

2008-03-113

Radio Access Network

Radio NetworkController

Core Network

NODE B

Mobile terminals

Radio Access NetworkRadio Access Network

Network Management Network Management systemsystem

OSS

Operation Support System

CN/other management appl.

Iu

Iur

Iub

RAN Customer Services

ServiceServicess


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Text 24 pt


2008-03-114

NODE B

RNC Interfaces

CN

D-RNCS-RNC

UE

NAS

Iu(RANAP)

Iub

Uu

Iur

(NBAP)

(RNSAP)

(RRC)NODE B

Iub(NBAP)


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2008-03-115

RNC Concepts - Serving and Drift RNS

Core Network

SRNSDRNS

UE

IurIu-cs Iu-ps


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RADIO ACCESS BEARERS


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A UMTS Bearer is a UMTS service providing an application using the UMTS network with the ability to send and receive data over the UMTS network with a specific Quality of Service (QoS). Network Services are considered end-to-end, this means from a Terminal Equipment (TE) to another TE. An End-to-End Service may have a certain Quality of Service (QoS) which is provided for the user of a network service. It is the user that decides whether he is satisfied with the provided QoS or not. To realise a certain network QoS a Bearer Service with clearly defined characteristics and functionality is to be set up from the source to the destination of a service. A bearer service includes all aspects to enable the provision of a contracted QoS. These aspects are among others the control signalling, user plane transport and QoS management functionality. A Radio Access Bearer (RAB) represents a bearer between the UMTS Core Network Edge Node (SGSN) and the UE. Each Bearer is associated with either the Packet Switched or Circuit Switched domain and provides a specific Quality of Serivce. Quality Of Service in UMTS is divided into four classes, Conversational, Streaming, Interactive and Background and is also characterised by maximum bitrate, guaranteed bitrate, transfer delay, priority, error rate etc.

RNC Concepts - Radio Access Bearer


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TE MT RAN CN EDGE NODE

CN Gateway

TE

UMTS

End-to-End Service

TE/MT Local Bearer Service

UMTS Bearer Service External Bearer Service

UMTS Bearer Service

Radio Access Bearer Service CN Bearer Service

Backbone Bearer Service

RAN Access Bearer Service

Radio Bearer Service

Physical Radio Bearer Service

Physical Bearer Service



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2008-03-119

Conversational RAB for AMR speech (Voice RAB - CS) Interactive RAB (Internet access - PS) Conversational RAB for UDI of 64 kbps (H.324M multimedia - CS) Streaming RAB (CS) offers support for variable rate circuit switched data up to 57.6 kbps Streaming RAB (PS) offers support for guaranteed rate packet switched data Multiple RABs offers support for multiple RABs configured simultaneously to the same UE

one or more PS RABs together with maximum one CS RAB Multiple PS RABs



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RAB Id Included in the RANAP RAB Assignment Request to identify a specific RAB instance for a specific UE connection. Unique to the CN and UE connection

Internal RAB Id RNC internal identifier representing the RAB type. Where multiple instances of a RAB type are supported, multiple Internal RAB Ids are defined

RNC Concepts - Radio Access Bearer Identities

SRB Only: 0

Conversational CS Speech: 1Conv CS Unknown First:

2Conv CS Unknown Second (reserved):

3Conv PS Speech: 4Conv PS Unknown First:

5Conv PS Unknown Second (reserved):

6

Streaming CS Unknown: 7

Streaming PS Unknown First: 8Streaming PS Unknown Second (reserved):

9Interactive PS First:

10interactive PS Second:

11Conversational CS Speech (AMR-WB):

12Interactive PS Third:

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Internal RAB Id Mapping


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RADIO BEARERS


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Control PlaneThe Control Plane implements the control of the Radio Access Bearers and the connection between the UE and the Network from different aspects (Requesting the service, controlling different transmission resources, handover etc). Also a mechanism for the transparent transfer of NAS messages is included.The Control Plane Includes the Application Protocol, i.e. RANAP, RNSAP or NBAP, and the Signalling Bearer for transporting the Application Protocol messages.

User PlaneThe User Plane implements the actual radio access bearer service, i.e. carrying user Data/Data Stream(s) through the access stratum The Data Stream(s) is/are characterised by one or more frame protocols specified for that interface.

RNC Concepts - Control and User Planes


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2008-03-1113

RRC

RLC

MAC

PHY

PDCPBMC

L3

L2

USER PLANE RADIO BEARERSSIGNALLING RADIO BEARERS

L1

Control Plane User Plane

LOGICAL CHANNELS

TRANSPORT CHANNELS

Control

RNC Concepts - Radio Interface Protocol Architecture


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• A Radio Bearer (RB) represents a bearer between the UTRAN and the UE. Therefore RABs are realised via bearers between the Core Network and UTRAN and Radio Bearers between UTRAN and UE. In general there is a one to one mapping between RABs and RBs. Speech RAB is an exception where each 20ms sample of speech is coded into three classes, A, B and C with different requirements on channel coding due to different sensitivity to errors. Each class is transferred via a separate radio bearer.

• Signalling Radio Bearers (SRB) are defined to allow control plane signalling between UTRAN and the UE and between the UMTS Core Network (Non Access Stratum) and the UE. They represent the bearer between the UTRAN and the UE over which such signalling is transferred. There are four SRBs, SRB 1, 2, 3 and 4 for dedicated control channel (DCCH) signalling with:

• SRB 1 used for RRC unacknowledged mode• SRB 2 for RRC acknowledged mode• SRB 3 for Non Access Stratum high priority Signalling• SRB 4 for Non Access Stratum low priority Signalling• SRB 0 is used for common control channel (CCCH) signalling

• Signalling between the UTRAN and the Core Network is via Signalling Connection Control Part (SCCP) connections, with a SCCP connection (a logical connection over a physical link) established for each UE to each Core Network (PS and CS) as needed.

RNC Concepts - Radio Bearers


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RB Identity UTRAN identifier configured in UE to represent a specific Radio Bearer RNC is responsible for allocation of RB Identity, based on hardcoded table Incoming CN Relocation can trigger flexible allocation of RB Identity

RNC Concepts - Radio Bearer Identities

SRB1: 1SRB2: 2SRB3: 3SRB4: 4Conversational CS Speech Subflow 1:

5Conversational CS Speech Subflow 2:

6Conversational CS Speech Subflow 3:

7Conv CS Unknown: 12

Streaming CS: 22Streaming PS: 23Interactive PS First:

16Interactive PS Second:

17Interactive PS Third:

18AMR-WB Conversational CS Speech Subflow 1:



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RB Id Mapping


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RB Type RNC MOM enum used to distinguish Radio Bearer specific MO instances (UeRcRb, UeRcTrCh etc) Used internally in UEH to distinguish different services (speech, packet, etc) Used in UEH for transport bearer handling (determination of transport bearers to add/remove, identifying specific transport bearer instances etc.)

RNC Concepts - Radio Bearer Types

uehRbRrc: 0

uehRbSpeech: 1uehRbPacket: 2uehRbCsFix:

3uehRbCsVar:

4uehRbPsStreaming 5uehRbPacketAdch 6uehRbPacketHs 7

uehRbPacket2: 8uehRbPacket3: 9uehRbPacketHs2: 10uehRbPacketHs3: 11uehRbpacketAdch2: 12uehRbPacketAdch3: 13uehRbPsStreamingHs: 14uehRbPsStreamingAdch

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RB Type Mapping


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2008-03-1117

CommonLogicalChannel

Uu Interface

CommonTransportChannel

CommonPhysicalChannel

DedicatedLogicalChannel

DedicatedTransportChannel

DedicatedPhysicalChannel

RNC

RBS

Logical Channel: A Logical Channel is an information stream

dedicated to the transfer of a specific type ofinformation over the radio interface.

Transport Channel:The channels offered by the physical lay-er to Layer 2 for data transport betweenpeer L1 entities are denoted as TransportChannels. Different types of TransportChannels are defined by how and with

which characteristics data is transferredon the physical layer, e.g. whether using

dedicated or common Physical Channelare employed.

Physical Channel:

RNC Concepts - Channel Concepts

In FDD mode, a Physical Channel is definedby code, frequency and, in the Uplink, relative phase (I/Q). In TDD mode, a physical Channel is defined by code, frequency, and time slot.


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Physical Channels Transport Channels Logical Channels

DCH (DL/UL)Dedicated Channel

CCCHCommon Control Channel

DCCHDedicated Control Channel

PCCHPaging Control Channel

BCCHBroadcast Control Channel

DTCHDedicated Traffic Channel

PCH (DL)Paging Channel

FACH (DL)Forward Access Channel

BCH (DL)Broadcast Channel

RACH (UL)Random Access

Channel

Common Transport Channels

PRACH (UL)Physical Random Access

ChannelAICH

Acquisition Indication Channel

P-CCPCH (DL)Primary Common Control Physical

ChannelS-CCPCH (DL)

Secondary Common Control Physical Channel

PICH (DL)Paging Indication Channel

DPDCH (UL/DL)Dedicated Physical Data

ChannelDPCCH (UL/DL)

Dedicated Physical Control Channel

DPCH - Dedicated Physical Channel

*simplified

RNC Concepts - Channels


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RRC STATES AND CHANNEL SWITCHING


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2008-03-1121

Cell DCH

RNC Concepts - RRC UE State Model

Idle mode

UTRAN Connected mode

ReleaseRRC

Connection

URA_PCH

CELL_FACH

CELL_PCH

Establish/

Cell FACH

Cell PCH URA PCH


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RNC Concepts – Transport Channel Types

CELL_FACH RRC State (Only valid for single PS Interactive RAB)RACH – Random Access Channel (uplink only)FACH – Forward Access Channel (downlink only)Signalling Radio Bearers and PS RAB use cell common channels (RACH/FACH)

CELL_DCH RRC State (Valid for all RAB configurations)

DCH – Dedicated Channel (uplink or downlink)HS-DSCH – High Speed Downlink Shared Channel (downlink only)E-DCH – Enhanced Dedicated Channel (uplink only)Signalling Radio Bearers and configured RABs use dedicated channels via radio links configured in each cell

Combinations include RACH/FACH, DCH/DCH, DCH/HS-DSCH and E-DCH/HS-DSCH


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RNC Concepts – Channel Switching

Channel Switching: Reconfigure Transport Channel Type or change DCH. Applies to PS Interactive RABs (QoS class Interactive or Background).

The transport channel type can be reconfigured between using the RACH/FACH in CELL_FACH and using DCH, E-DCH or HS-DSCH in CELL_DCH. The combinations supported for uplink/downlink are: RACH/FACH DCH/DCH DCH/HS-DSCH E-DCH/HS-DSCH.

For connections using DCH, the rate can be reconfigured and this is also channel switch, e.g. 64kbps/64kbps to 64kbps/128kbps or 64kbps/HS-DSCH to 384kbps/HS-DSCH.

Note that an existing PS Streaming RAB may be reconfigured when establishing or releasing another RAB, although this is not considered ‘channel switching’.


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TRANSITIONS FROM COM TO DED, DED TO COM ETC.


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COM to DED is a reconfiguration from CELL_FACH to CELL_DCH– Triggered by RAB Establishment, Release or Channel Switch

DED to COM is a reconfiguration from CELL_DCH to CELL_FACH– Triggered by a RAB Establishment, Release or Channel Switch

DED to DED is a reconfiguration in CELL_DCH– Triggered by a RAB Establishment, Release or Channel Switch

Note that CELL_FACH is only valid for a single PS Interactive RAB

RNC Concepts – Transition from COM to DED, DED to COM etc.


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UeRc, Connection Properties and Connection Capabilities


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2008-03-1127

RNC concepts - UeRc

UeRc is a Managed Object class

Each UeRc instance models a specific Radio Connection Configuration

A Radio Connection Configuration is a UE configuration including UTRAN-UE signalling connection and optionally one or more Radio Access Bearers (RAB)

Each RAB combination is supported via a specific UeRc instance:

– UeRc 1: SRB only– UeRc 2: Speech– UeRc 3: CS Conversational Data– UeRc 4: PS Interactive on RACH/FACH– UeRc 5: PS Interactive on DCH 64/64– UeRc 6: PS Interactive on DCH 64/128– UeRc 7: PS Interactive on DCH 64/384– …– UeRc 10: Speech + PS Interactive on DCH 64/64– …– UeRc 15: PS Interactive on DCH 64/HS-DSCH– …– UeRc 62: 2 x PS Interactive on EUL/HS– ...


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RNC concepts - UeRc

UeRc Managed Object class contains the following subclasses:

– UeRcRb (models Radio Bearer parameters including RLC)– UeRcRbRlc (models alternative RLC parameters for EL2, EUL 2ms TTI)– UeRcTrCh (models Dedicated Transport Channel parameters, e.g. TFS, TTI)– UeRcPhyChUl (models uplink Physical Channel Parameters, e.g. SF, Slot Format)– UeRcPhyChDl (models downlink Physical Channel Parameters, e.g. SF, Slot Format)– UeRcRab (models RAB parameters)– UeRcHsdsch (models HS-DSCH priority queue parameters)– UeRcEdchFlow (models E-DCH Mac-d flow parameters)– UeRcPhyChEdch (models E-DPDCH and E-DPCCH parameters)– UeRcEdchGainFactors (models E-DPDCH gain factors parameters)


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RNC concepts – UeRc transition

A UeRc transition describes a UE reconfiguration from one UE combination to another, e.g.

– UeRc 1 -> UeRc 5 (SRB to PS Interactive 64/64)– UeRc 5 -> UeRc 10 (PS Int 64/64 to Speech + PS Int 64/64)

A UeRc transition involves a reconfiguration of RBS/DRNC (NBAP, RNSAP), DcSP (SP Bag) and UE (RRC) via a UEH procedure capsule


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RNC concepts – Connection Properties

Connection property is a concept introduced in addition to UeRc to describe a UE Radio Connection Configuration

– UE configuration is function of UeRc instance + Connection Properties

Allows multiple configurations (alternative L1 and L2 parameter settings) to be supported with a single UeRc and therefore minimise the number of supported UeRc instances and UeRc transitions

Applies where the RAB combination is described by one UeRc but specific sub-characteristics are described by connection properties, e.g. EUL/HS evolved HS concepts providing higher bitrates

Connection properties include:– Eul 2ms TTI (active set property)– Enhanced Layer 2 (serving cell set property)– 64QAM (serving cell set property)– MIMO (serving cell set property)– SRB on EUL (active set property)– SRB on HS (serving cell set property)– MultiCarrier (serving cell set property)– AMR Multimode (cell independent property)


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RNC concepts – Connection Capabilities Connection capabilities allow support of specific

UE Connection Configurations within a UeRc instance to be enabled/disabled

Connection capabilities map to connection properties as follows:

– Connection capabilities describe the alternative configurations potentially supported by a specific UeRc instance

– Connection properties describe the actual connection capabilities which are currently active for the currently configured UeRc instance for a specific UE connection

Connection capabilities can be enabled/disabled per UeRc via attribute UeRc.connectionCapability. Currently only the following are configurable

– Fractional DPCH (required for SRB on HS)– MultiCarrier


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TRANSPORT BEARERS


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• Transport Bearers are bearers in the Transport Network used to transfer control plane and user plane data between RNC and the RBS, between the UMTS Core Network (Non Access Stratum) and the RNC and between Serving RNC and Drift RNC.

• A UTRAN may consist of multiple RNC and RBS (also called Node B). Transport Bearers support IP or ATM transport.

• Transport bearer establishment, release and fault handling is provided by the DRH subsystem in RNC, but only for dedicated transport bearers for UEs. UEH uses this DRH service via the signal interface DrhIfTrBrP. DRH uses the Cello Packet Platform (CPP) to execute the requests from UEH to establish or release transport bearers and to inform UEH of faults reported from CPP.

• Transport bearers are established by UEH on Iu interface for CS RABs and on Iub/Iur interface when not in CELL_FACH

RNC Concepts - Transport Bearers


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• Each interface (Iu to CN, Iur to DRNC and Iub to RBS) can support the following transport layer technologies:

• Iu and Iur interface: ATM or IP• Iub interface – user plane: ATM, IP or both (dual stack)• Iub interface – control plane: ATM or IP

• ATM transport connections are established directly from the SRNC to the RBS

• DRNC is not involved in transport bearer configuration where

both Iur (SRNC-DRNC link) and Iub (DRNC-RBS link) are configured for ATM

• DRNC is involved in transport bearer configuration where either Iur (SRNC-DRNC link) or Iub (DRNC-RBS link) are configured for IP

RNC Concepts – IP and ATM Transport Bearers


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• The principles and rules for configuring transport bearers for different services on the Iu, Iur and Iub interface are documented in the attached document:

RNC Concepts – IP and ATM Transport Bearers

Microsoft Word Document

• The relationship between transport bearers and RB Type is described at: http://wiki.eei.ericsson.se:8080/index.php/UEH:UehBehaviourBaseSsL_Information

http://wiki.eei.ericsson.se:8080/index.php/UEH:UehBehaviourBaseSsL_Information

http://wiki.eei.ericsson.se:8080/index.php/UEH:UehBehaviourBaseSsL_Information

Utran Concepts

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