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
Register with core network
Cell State Transitions
Radio frame synchronisation
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
Radio frame synchronisation
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
Radio frame synchronisation
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).
Cell Selection Criterion S
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
• 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.
Cell Reselection: R-Criterion
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
Cell Reselection: R-Criterion
• 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
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 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• 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
RRC Connection Establishment
Node BUE RNC
[RACH] RRC Connection Request
[DCH] RRC Connection Setup Complete
[FACH] RRC Connection Setup
accepted
[RACH] RRC Connection Request
[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
RRC Connection Establishment
Node BUE RNC
[RACH] RRC Connection Request
[DCH] RRC Connection Setup Complete
[FACH] RRC Connection Setup
accepted
[RACH] RRC Connection Request
[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 Connection Setup ( )
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 Connection Setup ( )
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
Register with core network
AMR speech call
Handovers
Release of AMR speech call
Radio frame synchronisation
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
Mobile Terminated Call (MTC)
ServiceRequest
Radio AccessBearer
Paging
Mobile Originated Call
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
Initial Direct Transfer
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
Initial Direct Transfer
CM Service RequestRRC RRC
Initial UE Message
CM Service RequestRANAPRANAP
Overview of Setting up an AMR call
Mobile Terminated Call (MTC)
Iu_CS
connection
Radio AccessBearer
Paging
Mobile Originated Call
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
Register with core network
AMR speech call
Release of AMR speech call
Radio frame synchronisation
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
Top Related