eagle radio interface procedures
TRANSCRIPT
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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
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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
Register with core
network
Cell State Transitions
Radio frame
synchronisation
Cell search
Originating PS Call
AMR Speech call PS Data call
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Radio Interface Overview
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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
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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
Gateway3G MSC
A
• Protocol stacks include both user and control planes
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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
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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
LinkLayer
LinkLayer
A Law
PCM,
etc
A Law
PCM,
etcPSTN
UE
Node B
RNC
Multimedia GW 3G MSC
Uu Iub Iu,cs A
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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
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MAC Layer
RLC Layer
PHY Layer
Control Plane Signalling User Plane
RRC Layer
TrCHs
RLCRLCRLC
RLC
RLCRLC RLC
RLC
BMC
PDCPPDCP
PDCP
PhyCHs
LogCHs
RBs
controlcontrol
control
control
control
Radio Interface Protocol Architecture
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WCDMA Frame
• Radio frame: A radio frame is a processing duration which consists of 15 slots. Thelength of a radio frame corresponds to 38400 chips.
• Slot: A slot is a duration which consists of fields containing bits. The length of a slotcorresponds to 2560 chips
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
10ms
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Cell Search ProcedureRadio Interface Synchronisation
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Cell Synchronisation
Detect cells Acquire slot synchronisation
Phase 1 – P-SCH
Phase 2 – S-SCH
Phase 3 – P-CPICH
Acquire frame synchronisation
Identify the code group of thecell found in the first step
Determine the exact primary
scrambling code used by thefound cell
Measure level & quality of thefound cell
►
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Cell Synchronisation Procedure
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 requiredfor 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 acquireslot synchronisation to a cell. This is typically done with a single matched filter (or any similar device) matched tothe primary synchronisation code which is common to all cells. The slot timing of the cell can be obtained bydetecting 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 tofind frame synchronisation and identify the code group of the cell found in the first step. This is done bycorrelating the received signal with all possible secondary synchronisation code sequences, and identifying themaximum correlation value. Since the cyclic shifts of the sequences are unique the code group as well as theframe 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 correlationover the CPICH with all codes within the code group identified in the second step. After the primary scramblingcode has been identified, the Primary CCPCH can be detected. And the system- and cell specific BCHinformation can be read.
If the UE has received information about which scrambling codes to search for, steps 2 and 3 above can be simplified.
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Broadcast of System Information
Read BCCH
Radio frame
synchronisation
Cell search
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P-CCPCH
PCH
BCH
DCCH
CCCH
PCCH
BCCH
DCH
CPICH
S-SCH
P-SCH
FACH
HS-DSCH
AICH
HS-PDSCH
DPDCH
S-CCPCH
DTCH
PICH
Logical
Channels
Transport
Channels
Physical
Channels
DPCCH
Channels carrying System Information
HS-SCCH
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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
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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)
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SIB 3
SIB Type 3
Parameters for cell selection and reselection
1. Cell Identity
2. Cell selection and reselection info
3. Cell access Restriction
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SIB Type5
Contains parameters for the configuration of common and Physical
channels
1. SIB6 indicator
2. PhyCH information elements
PICH power offset
AICH power offset
PCCPCH info
PRACH sys info list SCCPCH system information
CBS DRX Level 1 information
SIB T 7
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SIB Type 7
Contains the fast changing parameters
1) UL interference ( -110 to -70 dBm)
SIB Type 11
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SIB Type 11
Contains measurement control information to be used in the cell
1. FACH measurement occasion info
FACH Measurement occasion cycle length coefficientinter frequency FDD measurement indicator
inter-RAT measurement indicators
2. Measurement control Sys info
Use of HCS (Enumerated(not used, used))
Cell selection and Reselection quality measure
inter-freq meas sys info
intra-freq meas sys infointer-RAT meas sys info
Traffic volume meas sys info
UE internal meas sys info
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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 T 16
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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
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SIB Type 17 and SIB Type 18
SIB Type 17
Only for TDD
SIB Type 18
PLMN identities for neighbouring cells
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Cell SelectionUE is powered up
Read BCCH
Cell selection
Radio frame
synchronisation
Cell search
Cell Selection Criterion S
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• 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
Cell Selection Criterion S (in the FDD mode)
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Qqualmeas (dB)
(CPICH Ec/N0)
Qrxlevmeas (dBm)
CPICH RSCP
Qqualmin
( –24...0)
Qrxlevmin
( –115... –25)
Srxlev > 0
Pcompensation
Squal > 0S-Criterion
fulfilledSqual >0 AND
Srxlev > 0
suitabl
e
cell?
Cell Selection Criterion S (in the FDD mode)
Cell Selection Criterion S
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• If the UE determines the cell„s RX level value Q rxlevmeas 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).
Cell Selection Criterion S
Cell Selection Criterion S
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Cell Selection Criterion S
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
(Initial) Cell Selection Process
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• 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 Process
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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
Cell Selection When Leaving the RRC Connected Mode
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• 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
Nokia Parameters for Cell Selection
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• 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.
[..]
o a a a ete s o Ce Se ect o
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Cell Reselection
Cell reselection
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Measuredneighbours
Neighbour listfrom BCCH
Best ranked cell
Measurement criteria
S – criteria
Suitableneighbours
R – criteria
Re-selection if not serving cell
Cell Reselection: Measurement Rules
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• 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-frequencymeasurements. 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
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Sintrasearch SintersearchSsearchRAT m
No need tomeasure
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
-8 dB-10 dB-14 dBEC/N0 =
Cell Reselection: R-Criterion
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• 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
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• 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.
Cell Reselection: R-Criterion
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Rs = Qmeas,s + Qhysts
Rn = Qmeas,n - Qoffsets,n
Qmeas,n
Qmeas,s
Q m e a s
Rs
Rn
Qoffsets,n
Qhysts
Rn > Rs =>“cell reselection“
Treselection
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45 © Nokia Siemens Networks Presentation / Author / Date
For internal use
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Register with Core Network
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
Register with the Core Network UE is
d
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gpowered up
Read BCCH
Cell selection
Register with core
network
Originating AMR
speech call
Handovers
Release of AMR
speech call
Radio frame
synchronisation
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
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3G-MSC/VLR
3G-SGSN
UE Node BRNC
RNC
RNS
RNS
RRC
Iur: RNSAP
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RRC Connection Establishment
RRC Connection Establishment
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Node BUE RNC
[RACH] RRC Connection Request
[DCH] RRC Connection Setup Complete
[FACH] RRC Connection Setup
accept
ed
[RACH] RRC Connection Request
[FACH] RRC Connection Reject
UE RNC
rejected
RRC Modes
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Release RRC
Connection
Release RRC
Connection
Establish RRC
Connection
URA_PCH
CELL_DCH CELL_FACH
CELL_PCH
Establish RRC
Connection
UTRA RRC Connected Mode
Idle Mode
GSM
ConnectedMode
GPRS Packet
Transfer
Mode
(UE camps on UTRAN cell)
Release RR
Connection
Establish RR
Connection
GSM-UMTS Handover
UTRA: Inter-RAT Handover
(MS in GPRS
Packet Idle Mode)
Cell
Resele-ction
Initiation
of a TBF
Release
of a
TBF
(MS camps on a GERAN cell)
(adopted from TS 25.331 V3.1
CELL_DCH State
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active set
cell
active set
cell
• 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
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serving
cell
• 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
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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
RRC Connection Establishment
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Node BUE RNC
[RACH] RRC Connection Request
[DCH] RRC Connection Setup Complete
[FACH] RRC Connection Setup
accept
ed
[RACH] RRC Connection Request
[FACH] RRC Connection Reject
UE RNC
rejected
Signalling Radio Bearers
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RNC
Radio Bearer
LogCH
NAS Signalling
RRC layer
MAC
RLC
UL: TrM
DL: UM
RB1
CCCH
RLC
UL & DL:
UM
RB2
DCCH
RLC
UL & DL
AM
RB3
DCCH
RLC
UL & DL
AM
RB4
DCCH
RB0
RLC
UL & DL
AM
DCCH
UE
RRC Connection Setup ( )
RRC Signalling
RRC Connection Setup messageRRC Connection Set p ( )
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UERNC
RRC Connection Setup ( )
RRC layer
PHY
MAC
RLC
PDCP BMC
Radio Beare
LogCH
TrCH
PhyCH
NAS Signalling user plane
PhyCh
configuratio
n
TrCH
configuratio
n
RB
configuratio
n
Signalling Channel configuration
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Logical
ChannelsTransport
Channels
Physical
Channels
Data
DCCH1-4
DPCH
RRC
signallingDCH1
RRC Connection Setup messageRRC Connection Setup ( )
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UERNC
RRC Connection Setup ( )
RRC layer
PHY
MAC
RLC
PDCP BMC
Radio Beare
LogCH
TrCH
PhyCH
NAS Signalling user plane
PhyCh
configuratio
n
TrCH
configuratio
n
RB
configuratio
n
RRC Connection SetupUE Node-B RNC CN
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RRC Connection Setup Request ( CCCH on RACH)
Radio Link Setup RequestNBAPNBAP
Radio Link Setup ResponseNBAPNBAP
RRC Connection Setup Complete (DCCH on DCH)
RRC Connection Setup (CCCH on FACH)
Establish Request ALCAP ALCAP
Establish Response ALCAP ALCAP
RRC RRC
RRCRRC
RRC RRC
Signalling Bearer
establishment
AMR Speech CallUE is powered up
Cell search
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Read BCCH
Cell selection
Register with core
network
AMR speech call
Handovers
Release of AMR
speech call
Radio frame
synchronisation
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
Access
Bearer
Paging
Mobile Originated Call
RRC
Connectio
n
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64 © Nokia Siemens Networks Presentation / Author / Date
For internal use
Iu-CS Call Setup
Overview of Setting Up Call
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Mobile Terminated Call (MTC)
ServiceRequest
Radio
Access
Bearer
Paging
Mobile Originated Call
RRCConnection
Iu-CS Call Setup (CM Service Request)UE RNC MSCNode-B
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RRC Connection Setup
Initial Direct Transfer
CM Service Request RRC RRC
Initial UE Message
CM Service RequestRANAPRANAP
Initial UE Message
CM Service AcceptRANAPRANAP
Initial Direct Transfer
CM Service Accept RRC RRC
Iu-CS Call Setup (CM Service Request)UE RNC MSC
Node-B
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RRC Connection Setup
Direct Transfer
( Call Proceeding)RANAPRANAP
Downlink Direct Transfer (Call Proceeding) RRC RRC
Uplink Direct Transfer (Set up) RRC RRC
Direct Transfer (Setup)RANAPRANAP
Security Mode Command
Initial Direct Transfer
CM Service Request RRC RRC
Initial UE Message
CM Service RequestRANAPRANAP
Overview of Setting up an AMR call
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Mobile Terminated Call (MTC)
Iu_CSconnection
Radio
Access
Bearer
Paging
Mobile Originated Call
RRCConnection
Iu-CS Call Setup (RAB Setup)UE Node-B RNC MSC
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RRC Connection Setup & CM Service Request & Call Setup
RAB Assignment RequestRANAPRANAP
RAB Assignment ResponseRANAPRANAP
Radio Bearer Setup RRC RRC
Radio Bearer Setup complete RRC RRC
Establish Request/Confirm
ALCAP ALCAP
NBAP Procedures NBAPNBAP
ALCAP Procedures ALCAP ALCAP
Call SetupUE Node-B RNC MSC
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RRC Connection Setup, Iu CS Call Setup, Radio Bearer Setup
Alerting
Connect
Connect Acknowledge
Call Established
Release of AMR Speech CallUE is powered up
Cell search
Th ll i l d i t ll d h ith th i i ti
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Read BCCH
Cell selection
Register with core
network
AMR speech call
Release of AMRspeech call
Radio frame
synchronisation
• 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
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Call Established
Iu Release Command
Iu Release Complete
RRC Connection Release
RRC Connection Release Complete
RRC Connection Release Complete
RRC Connection Release Complete
Radio Link Deletion Request
Radio Link Deletion Response
ALCAP: 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