Download ppt - Radio Interface Procedures

Agenda

• Radio Interface Overview

• Cell Synchronisation

• Idle Mode Procedures

▪ Broadcast of system Information

▪ PLMN selection

▪ Cell Selection and Reselection

• RRC Connection Setup Procedure

• CS AMR Call Establishment

• PS Call Establishment

• Handover Procedures : Softer, Soft, Inter-RAT

Introduction

UE is powered up

Read BCCH

Cell selection

Register with core network

Originating AMR speech call

Handovers

Release of AMR speech call

Radio frame synchronisation

Cell search

UE is powered up

Read BCCH

Cell selection


Cell State Transitions


Cell search

Originating PS Call

AMR Speech call PS Data call

Radio Interface Overview

CN

circuitswitched

(cs) domain

packetswitched

(ps)domain

UTRAN

Radio Network Subsystem (RNS)

Radio Network Subsystem (RNS)

Iub

Iub

Iur

Iu-PS

Iu-CS

Uu

Uu

UE

UE

MSC/VLR

SGSN

RNC

RNC

UTRAN

Protocol Stacks• Communication between the UE, RNC and circuit switched core makes use

of

• Uu interface protocol stack

• Iub interface protocol stack

• Iu,cs interface protocol stack

• A interface protocol stack

Iub Iu,cs

Uu

Node B RNC Multimedia Gateway 3G MSC

A

• Protocol stacks include both user and control planes

CS Radio Interface Protocol (RIP) Control Plane

• The radio interface protocol control plane allows RRC signalling between the RNC and UE

• RRC signalling is communicated across the Iub using the Iub user plane protocol stack i.e. using Frame protocol and AAL2 based ATM

• Acknowledged or unackowledged mode RLC is used between the UE and RNC

WCDMA L1

RRC

WCDMA L1

AAL2

FP

ATM

Phy

MAC

RLC-C

AAL2

FP

ATM

Phy

MAC

RLC-C

UE

Node B

RNC

Uu Iub

RRC

CS Radio Interface Protocol (RIP) User Plane

• The 3G MSC provides connectivity to the circuit switched core and PSTN

• Transparent mode RLC is used between the UE and RNC

• AAL2 based ATM is used to transfer user plane data across the Iub and Iu,cs interfaces

WCDMA L1

e.g. vocoder

WCDMA L1

AAL2

FP

ATM

Phy

MAC

RLC-U

AAL2

FP

ATM

Phy

MAC

RLC-U

AAL2

ATM

Phy

Iu,cs UP

AAL2

ATM

Phy

Iu,cs UP

e.g. vocoder

Phy Phy Phy

Link Layer

Link Layer

A Law PCM, etc

A Law PCM, etc

PSTN

UE

Node B

RNC

Multimedia GW 3G MSC

Uu Iub Iu,cs A

UTRAN

RNC

UE CN Iu edge node

NAS signalling and User datai.e. MM, PMM & CC, SS, SMS, SM

Access Stratum Signalling(Uu Stratum)

RRC

Access Stratum Signalling(Iu Stratum)

RANAP

AS and NAS Signalling

TE TECN

GatewayMT UTRANCN Iu

edge node

End-to-End Service

TE/MT LocalBearer Service

ExternalBearer ServiceUMTS Bearer Service = UMTS QoS

CNBearer Service

Radio AccessBearer Service

BackboneBearer Service

RadioBearer Service

IuBearer Service

UTRA FDD/TDD Service

PhysicalBearer Service

UMTS QoS Architecture

MAC Layer

RLC Layer

PHY Layer

Control Plane Signalling User Plane

RRC Layer

TrCHs

RLCRLC

RLCRLC

RLCRLC

RLCRLC

BMC

PDCPPDCP

PDCP

PhyCHs

LogCHs

RBs

controlcontrol

control

control

control

Radio Interface Protocol Architecture

WCDMA Frame

• Radio frame: A radio frame is a processing duration which consists of 15 slots. The length of a radio frame corresponds to 38400 chips.

• Slot: A slot is a duration which consists of fields containing bits. The length of a slot corresponds to 2560 chips

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

10ms

Cell Search Procedure Radio Interface Synchronisation

Cell Synchronisation

Detect cells

Acquire slot synchronisationPhase 1 – P-SCH

Phase 2 – S-SCH

Phase 3 – P-CPICH

Acquire frame synchronisation

Identify the code group of the cell found in the first step

Determine the exact primary scrambling code used by the found cell

Measure level & quality of the found cell

►

Step 1- Slot synchronization

►◄

Slot Synchronization

PSC : Primary synchronization code– 256 chip sequence transmitted in each slot interval

– Same for all cells and slot intervals

– Mobile Station uses the PSC to acquire slot synchronization

– The sot timing of the cell can be obtained by detecting peak values in the matched filter

Matched filter

TS Boundary

2560 chips

PSCH

Stored PSCH

Step 2 - Frame SynchronizationSSC: Secondary synchronization code

– 256 chip sequence transmitted in parallel with PSC.– In general different for different cells and slot intervals – 16 different ‘256 chip’ sequence ( 16 secondary synch code)– Code word of 15 consecutive SSC indicates ‘cell scrambling code group’– There are 64 such code groups– UE checks in each slot 16 possible SSC sequences and select which gives the

highest correlation value => 15 codes are selected– The cyclic shift is unique and gives the frame synchronization and the

scrambling code group

Slot No. 0 1 2 14Group1 SSC1 SSC1 SSC2 ….. SSC16

Group2 SSC1 SSC1 SSC5 ….. SSC10

Group3 SSC1 SSC2 SSC1 …… SSC12…..…..

Group64 SSC9 SSC12 SSC10 …… SSC10 ◄

15

15

scramblingcode group

group 00

group 01

group 02

group 03

group 05

group 04

group 62

group 63

1 1 2 8 9 10 15 8 10 16 2 7 15 7 16

1 1 5 16 7 3 14 16 3 10 5 12 14 12 10

1 2 1 15 5 5 12 16 6 11 2 16 11 12

1 2 3 1 8 6 5 2 5 8 4 4 6 3 7

1 2 16 6 6 11 5 12 1 15 12 16 11 2

1 3 4 7 4 1 5 5 3 6 2 8 7 6 8

9 11 12 15 12 9 13 13 11 14 10 16 15 14 16

9 12 10 15 13 14 9 14 15 11 11 13 12 16 10

slot number0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

11

11 11

11 11

11 11

11 11

15

15

15

15 15

15

15

15 15

15 15

5

5

I monitor the S-SCH

SSC Allocation for S-SCH

• With the help of the SCH, the UE was capable to perform chip, TS, and frame synchronisation. Even the cell‘s scrambling code group is known to the UE.

• But in the initial cell selection process, it does not yet know the cell‘s primary scrambling code.

• There is one primary scrambling code in use over the entire cell, and in neighbouring cells, different scrambling codes are in use. There exists a total of 512 primary scrambling codes.

How does UE identify Cell’s primary scrambling code ( 1 out of 512 codes)

Step 3 - Scrambling Code Identification

Step 3 - Scrambling code Identification

1) Long Scrambling code :262143 Codes

2) To speed up the cell search => only 8192 codes3) 8192 code grouping: 512 groups of 16 codes each (512*16 = 8192)

4) 16 codes in each group => first code is Primary scrambling code and 15 codes are Secondary scrambling codes

5) Again 512 codes are further divided into 64 groups of 8 codes

6) These 64 groups map to the 64 scrambling code group used at stage 2 during frame synchronization• That way UE limits its Primary Scrambling code search to just 8 codes

• At this stage max 8 attempts to find out the Primary Scrambling code of the cell

7) Each cell is allocated one Primary scrambling code ( Carrying P-CPICH, PCCPCH, PICH, AICH and S-CCPCH)

8) Other channels can use Primary scrambling code or secondary scrambling codes from the same group

CP

2560 Chips 256 Chips

Synchronisation Channel (SCH)

P-CPICH

10 ms Frame

applied speading code =cell‘s primary scrambling code

Cch,256,0

• Phase reference• Measurement reference

P-CPICH

Cell scrambling

code? I get it with trial &

error!

Primary Common Pilot Channel (P-CPICH)

Timing Relationship

Cp Cp Cp

Cs1 Cs1Cs2

Primary SCH

Secondary SCH

Primary CCPCH

256 chips

2560 - 256 chips

Slot 1 Slot 2 Slot 15 Slot 1

Primary CPICH

Cell Synchronisation Procedure: Summary

When a UE is switched on, it starts to monitor the radio interface to find a suitable cell to camp on but it has to determine, whether there is a WCDMA cell nearby. If a WCDMA cell is available, the UE has to be synchronised to the downlink transmission of the system information – transmitted on the physical channel P-CCPCH – before it can make a decision, in how far the available cell is suitable to camp on. Initial cell selection is not the only reason, why a UE wants to perform cell synchronisation. This process is also required for cell re-selection and the handover procedure. Cell synchronisation is achieved I three phases• Step 1: Slot synchronisation

– During the first step of the cell search procedure the UE uses the SCH"s primary synchronisation code to acquire slot synchronisation to a cell. This is typically done with a single matched filter (or any similar device) matched to the primary synchronisation code which is common to all cells. The slot timing of the cell can be obtained by detecting peaks in the matched filter output.

• Step 2: Frame synchronisation and code-group identification– During the second step of the cell search procedure, the UE uses the SCH"s secondary synchronisation code to

find frame synchronisation and identify the code group of the cell found in the first step. This is done by correlating the received signal with all possible secondary synchronisation code sequences, and identifying the maximum correlation value. Since the cyclic shifts of the sequences are unique the code group as well as the frame synchronisation is determined.

• Step 3: Scrambling-code identification– During the third and last step of the cell search procedure, the UE determines the exact primary scrambling

code used by the found cell. The primary scrambling code is typically identified through symbol-by-symbol correlation over the CPICH with all codes within the code group identified in the second step. After the primary scrambling code has been identified, the Primary CCPCH can be detected. And the system- and cell specific BCH information can be read.

If the UE has received information about which scrambling codes to search for, steps 2 and 3 above can be simplified.

Broadcast of System Information

Read BCCH


Cell search

P-CCPCH

PCH

BCH

DCCH

CCCH

PCCH

BCCH

DCH

CPICH

S-SCHP-SCH

FACH

HS-DSCH

AICH

HS-PDSCH

DPDCH

S-CCPCH

DTCH

PICH

LogicalChannels

TransportChannels

PhysicalChannels

DPCCH

Channels carrying System Information

HS-SCCH

System Information

Node B

UTRANSystem Information ( )

UE RNC

NBAP: BCCH Information

MIB

SB1 SIB 1 SIB 2

SIB 11

•Master Information Block (MIB)

-- Reference to other system Information blocks and scheduling

blocks

•Scheduling Blocks (SB1/SB2)

-- References to other system Information blocks

•(SIB1-SIB18)

-- Contains the actual system Information

Contents of SIB Type

SIB Type1:

1. CN Common GSM-MAP NAS system information

LAC

CS Domain Specific info ( T3212 Timer value, ATT)

PS Domain specific info ( RAC, NMO)

2. UE Information

UE Timers and constants in IDLE mode

UE Timers and constants in connected mode

SIB Type 2:

UTRAN mobility information elements

URA identity (1..maxURA)

SIB 3

SIB Type 3

Parameters for cell selection and reselection

1. Cell Identity

2. Cell selection and reselection info

3. Cell access Restriction

SIB Type5

Contains parameters for the configuration of common and Physical

channels

1. SIB6 indicator

2. PhyCH information elementsPICH power offset

AICH power offset

PCCPCH info

PRACH sys info list

SCCPCH system information

CBS DRX Level 1 information

SIB Type 7

Contains the fast changing parameters

1) UL interference ( -110 to -70 dBm)

SIB Type 11

Contains measurement control information to be used in the cell

1. FACH measurement occasion info

FACH Measurement occasion cycle length coefficient

inter frequency FDD measurement indicator

inter-RAT measurement indicators

2. Measurement control Sys infoUse of HCS (Enumerated(not used, used))

Cell selection and Reselection quality measure

inter-freq meas sys info

intra-freq meas sys info

inter-RAT meas sys info

Traffic volume meas sys info

UE internal meas sys info

SIB Type 13,14 and 15

SIB Type 13:

Contains ANSI-41 information

SIB Type 14:

Contains UL Outer Loop Power parameters

Meant only for TDD

SIB Type 15:

Contains information pertaining to UE based positioning methods

SIB Type 16

Contains radio bearer, transport channel and physical channel parameters to

be stored by UE in idle and connected mode. The info is used during

handover to UTRAN

1. RB Information elements

2. TrCH Information Elements

3. PhyCH Information Elements

SIB Type 17 and SIB Type 18

SIB Type 17 Only for TDD

SIB Type 18

PLMN identities for neighbouring cells

Cell SelectionUE is powered up

Read BCCH

Cell selection


Cell search

• Which cells are suitable for (initial) cell selection and reselection, so that the UE can camp on them?

• This is determined by the UE based on the cell selection criterion S. •It is fulfilled, when

•Srxlev > 0 AND Squal > 0 in the FDD mode, and•Srxlev > 0 in the TDD mode.

• Squal delivers the cell Selection quality value (dB). •The UE determines it according to this formulary: Squal = Qqualmeas – Qqualmin•The UE measures the received signal quality Qqualmeas of the cell. It is based on CPICH Ec/N0 (dB) for FDD cells. (CPICH Ec/N0 is averaged.) •The operator determines for each cell the minimum required received level Qqualmin (dB) at the UE. This value is the broadcasted. Its integer value can range between –24 and 0 dB. •A cell is not suitable for cell selection and re-selection, if the measured received signal quality level is below Qqualmin.

• Srxlev stands for the cell selection receive level value (dB). •The UE determines it this way: Srxlev = Qrxlevmeas - Qrxlevmin – Pcompensation•Qrxlevmeas is the cell RX level measured by the UE, based on the CPICH RSCP for FDD cells (dBm), and the averaged received signal level for GSM cells (dBm). (All values get averaged!) •The operator sets the value Qrxlevmin as minimum required RX level in the cell (dBm), which is sent to the UE via the BCCH. Its integer value can range between –115 dBm and –25 dBm (2 dB step size).

Cell Selection Criterion S

Qqualmeas (dB)(CPICH Ec/N0)

Qrxlevmeas (dBm)CPICH RSCP

Qqualmin(–24...0)

Qrxlevmin(–115...–25)

Srxlev > 0

Pcompensation

Squal > 0 S-Criterionfulfilled

Squal >0 ANDSrxlev > 0

suitable

cell?

Cell Selection Criterion S (in the FDD mode)

• If the UE determines the cell‘s RX level value Qrxlevmeas and Qrxlevmin calculated the Srxlev accordingly, it may have good RX level which means, that a good DL connection can be established.

• But the UE‘s own output power capability has to be taken under consideration. This is done with

•Pcompensation = max(UE_TXPWR_MAX_RACH – P_MAX, 0) (dB)

• In order to access a cell, the UE has to use the common channel PRACH. • The operator determines the maximum cell radius by limiting the maximum TX power

level, a UE can use on the PRACH. This is the UE_TXPWR_MAX_RACH (dBm). • UE_TXPWR_MAX_RACH can range – according to the specifications - between –50 dBm

and 33 dBm. On the other hand, there is the UE‘s maximum RF output power, given by P_MAX (dBm).



Pcompensation= max(UE_TXPWR_MAX_RACH – P_MAX, 0)

Cell size defining parameters:• Qrxlevmin• Qqualmin

I am outsid

e

I am inside, but have not enough power

-50 .. 33 dBm

• There exist two cell selection procedures:

• Initial Cell Selection•The UE has to find a suitable cell of the PLMN, which was selected by the NAS. •To do so, the mobile phone scans all radio frequency carriers of UTRA. Hereby, the UE focuses its cell search to the suitable cell on each carriers. •As soon as the mobile phone has found a suitable cell, it selects it.

• Stored Information Cell Selection•To speed up the cell selection process – for instance, when the UE is switched on again – information about UTRA carriers, even cell parameters such as cell scrambling codes can be stored in the UE. •The UE uses this information to find a suitable cell of the PLMN, which was selected by the NAS.•If the cell selection based on stored information in the UE fails – e.g. the selected PLMN cannot be found – the UE continues the cell selection process based on the Initial Cell Selection procedure.

• Both for Initial Cell Selection and Stored Information Cell Selection, a cell is only suitable for the UE to camp on, if it fulfils the cell selection criterion S:

•Srxlev > 0 AND Squal > 0 in the FDD mode, and•Srxlev > 0 in the TDD mode.

(Initial) Cell Selection Process

Initial Cell Selection

(scan RF channel)

Stored Information Cell Selectionor

I have to find a

suitable cell

Squal = Qqualmeas – Qqualmin > 0Srxlev = Qrxlevmeas – Qrxlevmin – Pcompensation > 0

Once a suitable cell is found this cell is selected

(Initial) Cell Selection Process

• Active Set cells as candidates for cell selections; if not suitable, then

• Stored information cell selection Squal > 0Srxlev > 0

Cell Selection When Leaving the RRC Connected Mode

• WCEL: QrxlevMin •The minimum required RX level in the cell. •This parameter is part of SIB 3.•[-115 ... –25] dBm, step 2 dBm; default: -115 dBm.

• WCEL: QqualMin•The minimum required quality level in the cell (Ec/No). •This parameter is part of SIB 3.•[-24 ... 0] dB, step 1 dB, default: -18 dB.

• WCEL: UEtxPowerMaxPRACH•This parameter defines the maximum transmission power level a UE can use on PRACH. •The value of the parameter also effects the cell selection and reselection procedures. •The value of the parameter is sent to UE in the Cell selection and re-selection of SIB 3 and 4 of the serving cell.[..]

Nokia Parameters for Cell Selection

Cell Reselection

Cell reselection

Measuredneighbours

Neighbour listfrom BCCH

Best ranked cell

Measurement criteria

S – criteriaSuitable

neighbours

R – criteria

Re-selection if not serving cell

• As part of the network planning process, the operator has to determine the threshold values, which trigger the cell re-selection process by the UE.

• The operator has also to decide, whether to use the HCS. The BCCH is used to inform the UE about the use of HCS.

• Intra-Frequency measurement threshold Sintrasearch •If this parameter is not sent in the serving cell, the UE must always perform intra-frequency measurements. If it is transmitted and Sx > Sintrasearch, the UE does not perform intra-frequency measurements. If Sx <= Sintrasearch, it performs intra-frequency measurements.

• Inter-Frequency measurement threshold Sintersearch

•If this parameter is not sent in the serving cell, the UE must always perform inter-frequency measurements. If it is transmitted and Sx <= Sintersearch, it must perform inter-frequency measurements, but if Sx > Sintersearch, there is no need to perform this type of measurement.

• Inter-RAT measurement threshold SsearchRAT m •If this parameter is not sent in the serving cell, the UE must always perform inter-system measurements. If it is transmitted and Sx > SsearchRAT m, it won‘t conduct measurements on cells of radio access technology “m”. But if Sx <= SsearchRAT m, it has to do these measurements.

• Sintrasearch, Sintersearch, and SsearchRAT m can get integer values ranging from –32 to 20 (step size 2) in the FDD mode. Negative values are set to 0 by the UE.

Cell Reselection: Measurement Rules

SintrasearchSintersearchSsearchRAT m

No need to measure

neighbour cells

Intra- frequency

Sx=Squal (in FDD mode)

Intra-frequencyInter-frequency

serving cell

Example: Nokia Qqualmin = -18 dB, Sintrasearch = 10dB, Sintersearch = 8dB,Ssearch_RAT = 4dB

When to perform measurements

Intra-frequency

Inter-freqencyInter-RAT

Cell Reselection: Measurement Rules

-8 dB-10 dB-14 dBEC/N0 =

• After checking the measurement thresholds, the UE has detected suitable cells to camp on.

• But which of the remaining candidate cells is the best one for cell re-selection?

• For that, a cell-ranking criterion R was specified:•Rs = Qmeas,s + Qhysts (for the serving cell)•Rn = Qmeas,n - Qoffsets,n (for candidate neighbouring cells for cell reselection)

• The serving cell and the remaining candidate cells are ranked according to criterion R. • The cell ranked with the highest value R is the best cell for the UE to camp on. • Qhysts gives a hysteresis value to make the serving cell more attractive and thus delay

the cell re-selection. It exists in two versions:

•It ranges between 0 and 40 (step size 2).

• The value Qoffset is an offset given for each individual neighbouring cell, which ranges between –50 and 50 dB, with default set to 0.

Cell Reselection: R-Criterion

• Is the cell re-selection initiated immediately after the UE ranks a neighbouring cell to be the best?

•If so, we could face a ping-pong effect – a UE often performing cell reselection between two neighbouring cells. •To avoid this, the operator uses the time interval value Treselection, whose value ranges between 0 and 31 seconds. •Only when a cell was ranked Treselection seconds better then the serving cell, a cell reselection to this cell takes place. •In addition to this, a UE must camp at least 1 second on a serving cell, before the next cell re-selection may take place.

• How often are the cell re-selection criteria evaluated?•This is done at least once every DRX cycle for cells, for which new measurement results are available.


Rs = Qmeas,s + Qhysts

Rn = Qmeas,n - Qoffsets,n

Qmeas,n

Qmeas,s

Qm

eas

Rs

Rn

Qoffsets,n

Qhysts

Rn > Rs =>“cell reselection“

Treselection


• WCEL: UseOfHCS•This parameter indicates whether the serving cell belongs to a Hierarchical Cell Structure (HCS). •This parameter is part of SIB 11/12.•0 (HCS not used), 1 (HCS in use); default: 0.

• WCEL: Sintrasearch•The threshold for intra-frequency measurements, and for the HCS measurement rules.•This parameter is part of SIB 3.•[0 ... 20] dB, step 2 dB, default: 10 dB.

• WCEL: Sintersearch•The threshold for inter-frequency measurements, and for the HCS measurement rules.•This parameter is part of SIB 3.•[0 ... 20] dB, step 2 dB, default: 8 dB.

• WCEL: Ssearch_RAT•The RAT-specific threshold for inter-RAT measurement rules. •This parameter is part of SIB 3.•[0 ... 20] dB, step 2 dB, default: 4 dB.

Nokia Parameters for Cell Reselection

Register with Core Network

UE is powered up

Read BCCH

Cell selection



Handovers



Cell search

Register with the Core Network UE is powered up

Read BCCH

Cell selection



Handovers



Cell search• The UE registers with the CS core domain

• CS domain registering is an IMSI attach

• Registering is achieved by establishing an RRC connection and sending NAS messages to the CS core

• RRC CONNECTION ESTABLISHMENT

• LOCATION UPDATING PROCEDURE

►

UTRAN Specific Signalling Protocols

3G-MSC/VLR

3G-SGSN

UE Node BRNC

RNC

RNS

RNS

RRC

Iur: RNSAP

Iu-PS: RANAP

Iu-CS: RANAP

Iub: NBAP

RRC Connection Establishment


Node BUE RNC

[RACH] RRC Connection Request

[DCH] RRC Connection Setup Complete

[FACH] RRC Connection Setup

accepted


[FACH] RRC Connection Reject

UE RNC

rejected

RRC Modes

Release RRCConnection

Release RRCConnection

Establish RRCConnection

URA_PCH

CELL_DCH CELL_FACH

CELL_PCH

Establish RRCConnection

UTRA RRC Connected Mode

Idle Mode

GSMConnected

Mode

GPRS PacketTransfer

Mode

(UE camps on UTRAN cell)

Release RRConnection

Establish RRConnection

GSM-UMTS Handover

UTRA: Inter-RAT Handover

(MS in GPRSPacket Idle Mode)

CellResele- ction

Initiationof a TBF

Releaseof aTBF

(MS camps on a GERAN cell)

(adopted from TS 25.331 V3.12.0)

CELL_DCH State

active setcell

active setcell

• DCCH and – if configured – DTCH

• Dedicate physical channel in use

• UE location known on active set cell level

• UE responsible for measurement reporting

• RRC messages on DCCH

CELL_FACH State

servingcell

• DCCH and – if configured – DTCH

• FACH used for higher layer data transfer,

• UE monitors FACH permanently

• Uplink transmission on RACH• UE location known on serving

cell level• UE performs cell re-selection• UE responsible for

measurement reporting• Cell system information on

BCCH• RRC messages on BCCH,

CCCH and DCCH

CELL_PCH and URA_PCH State

URA – UTRAN Registration Area

• no DCCH and DTCH• Before uplink transmission UE moves to

CELL_FACH• UE must be paged• RRC messages on BCCH and PCCH• In CELL_PCH

- UE location known on cell level- UE performs cell re-selection and cell updates

• In URA_PCH- UE location known on URA level- UE performs cell re-selection and URA updates


Node BUE RNC


[DCH] RRC Connection Setup Complete

[FACH] RRC Connection Setup

accepted


[FACH] RRC Connection Reject

UE RNC

rejected

Signalling Radio Bearers

RNC

Radio Bearer

LogCH

NAS Signalling

RRC layer

MAC

RLCUL: TrMDL: UM

RB1

CCCH

RLCUL & DL:

UM

RB2

DCCH

RLCUL & DL

AM

RB3

DCCH

RLCUL & DL

AM

RB4

DCCH

RB0

RLCUL & DL

AM

DCCH

optional

UE

RRC Connection Setup ( )

RRC Signalling

RRC Connection Setup message

UERNC


RRC layer

PHY

MAC

RLC

PDCP BMC

Radio Bearer

LogCH

TrCH

PhyCH

NAS Signalling user plane

PhyChconfigurat

ion

TrCHconfigurati

on

RBconfigurati

on

Signalling Channel configuration

LogicalChannels

TransportChannels

PhysicalChannels

Data

DCCH1-4

DPCH

RRCsignalling

DCH1

RRC Connection Setup message

UERNC


RRC layer

PHY

MAC

RLC

PDCP BMC

Radio Bearer

LogCH

TrCH

PhyCH

NAS Signalling user plane

PhyChconfigurat

ion

TrCHconfigurati

on

RBconfigurati

on

RRC Connection Setup UE Node-B RNC CN

RRC Connection Setup Request ( CCCH on RACH)

Radio Link Setup Request NBAPNBAP

Radio Link Setup Response

NBAPNBAP

RRC Connection Setup Complete (DCCH on DCH)

RRC Connection Setup (CCCH on FACH)

Establish RequestALCAPALCAP

Establish ResponseALCAPALCAP

RRC RRC

RRCRRC

RRC RRC

Signalling Bearer

establishment

AMR Speech CallUE is powered up

Read BCCH

Cell selection


AMR speech call

Handovers



Cell search

Cell re-selections

• The AMR speech call can be either mobile originated or mobile terminated

• The following slides present a mobile originated call

• The first step is to establish an RRC connection. This is done in the same way as for the IMSI attach procedure

• The only difference is that the establishment cause specified in the RRC Connection Request message is specfied as

originatingConversationalCall

Mobile Terminated Call (MTC)

Iu-CS

Connection

Radio AccessBearer

Paging

Mobile Originated Call

RRCConnect

ion

76 © Nokia Siemens Networks Presentation / Author / DateFor internal use

Iu-CS Call Setup

Overview of Setting Up Call


ServiceRequest

Radio AccessBearer

Paging


RRCConnectio

n

Iu-CS Call Setup (CM Service Request) UE RNC MSC

RRC Connection Setup

Initial Direct Transfer

CM Service RequestRRC RRC

Initial UE Message

CM Service RequestRANAPRANAP

Initial UE Message

CM Service AcceptRANAPRANAP


CM Service AcceptRRC RRC

Node-B

Iu-CS Call Setup (CM Service Request) UE RNC

RRC Connection Setup

Direct Transfer

( Call Proceeding)

RANAPRANAP

Downlink Direct Transfer (Call Proceeding)RRC RRC

Uplink Direct Transfer (Set up)RRC RRC

MSC

Direct Transfer (Setup)RANAPRANAP

Node-B

Security Mode Command


CM Service RequestRRC RRC

Initial UE Message

CM Service RequestRANAPRANAP

Overview of Setting up an AMR call


Iu_CS

connection

Radio AccessBearer

Paging


RRCConnectio

n

Iu-CS Call Setup (RAB Setup) UE Node-B RNC

RRC Connection Setup & CM Service Request & Call Setup

RAB Assignment RequestRANAPRANAP

RAB Assignment ResponseRANAPRANAP

Radio Bearer SetupRRC RRC

Radio Bearer Setup completeRRC RRC

MSC

Establish Request/Confirm ALCAPALCAP

NBAP Procedures NBAPNBAP

ALCAP ProceduresALCAPALCAP

Call Setup UE Node-B RNC

RRC Connection Setup, Iu CS Call Setup, Radio Bearer Setup

MSC

Alerting

Connect

Connect Acknowledge

Call Established

Release of AMR Speech CallUE is powered up

Read BCCH

Cell selection


AMR speech call



Cell search

• The call is released in a controlled manner when either the originating or terminating terminal hangs-up

• The RRC connection is released and the UE returns to RRC Idle mode

Release of AMR Speech CallUE RNC MSCNode B

Call Established

Iu Release Command

Iu Release Complete

RRC Connection Release

RRC Connection Release CompleteRRC Connection Release CompleteRRC Connection Release Complete

Radio Link Deletion Request

Radio Link Deletion ResponseALCAP: Release Request

ALCAP: Release Response

ALCAP: Release Request

ALCAP: Release Response

Call Released

Direct Transfer (Disconnect)Direct Transfer (Release)

Direct Transfer (Release Complete)

•UE returns to Idle Mode