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UMTS Networks 1Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
UTRAN ProceduresElementary procedures
– Paging– RRC connection setup– Transaction reasoning– Authentication and security control– Transaction setup with RAB allocation– Transaction clearing and RAB release– RRC connection release
RRM procedures– Radio link addition and deletion– Intersystem handover from UMTS to GSM (CS/PS)– UE state transitions/ bearer reconfiguration
MM procedures -> see MM slidesCM procedures -> see CM slides
References: – Kaaranen ch. 10 (simple cases discussed here)– 3GPP TR 25.931 (more complicated cases)
UMTS Networks 2Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Basic Model of UMTS Network TransactionsPaging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UE indicates the CN the requested service
A transaction comprises all the elementary procedures required to enable
– the transport of user data (PS or CS mode) or
– the exchange of higher-layer signaling messages (e.g. MM or CM)
Allocation of bearers to support required UMTS bearer service
Transfer of data
Release of all bearers to support UMTS bearer service
UMTS Networks 3Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Paging
Paging type 1:• UE idle mode (no RRC connection)• RRC connected modes cell_PCH or URA_PCH
Example: paging for a UE in idle mode
UE N ode B1.1
N ode B2.1
RN C1
RN C2
C N
RA N A PRA N A P 1. Pagin g
2. PC C H : Pagin g T ype 1
RA N A P RA N A P1. Pagin g
3. PC C H : Pagin g T ype 1
(Requesting CN domain, IMSI, ...)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 4Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
PagingPaging type 2:• UE is in RRC connected mode cell_DCH or cell_FACH• Paging request from another CN domain
Example: paging for a UE in RRC Connected Mode (CELL_DCH or CELL_FACH state)
2 cases:• UTRAN coordinates the paging request with the existing RRC connection (given example)• UE coordinates the paging request with the existing RRC connection
U E Serving
R N C C N
R R C R R C 2 . D C C H : P aging T ype 2
R A N A P R A N A P 1 . P aging
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 5Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
RRC Connection Setup
Establishment of a RRC connection in cell_DCH mode
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UE Node B RNC CN
UE_Idle
CELL_DCH
Initial Random Access
CCCH (TM)/ RACH: RRC Connection Request
RL Setup Request
RL Setup Response
ALCAP Iub Transport bearer Setup
UL/DL Synchronisation
CCCH (UM)/ FACH: RRC Connection Setup
DCCH (AM)/ DCH: RRC Connection Setup Complete Addr.: by DCH DCCH established UE capabilities
known
Addr.: Initial UE IDRequest for DCCH Incl. Establishment
cause
Establishment of UTRAN DCH resources incl. CAC
Addr.: Initial UE ID
UMTS Networks 6Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Initial Random Access
UE addressing• CCCH: UE ID embedded in the RRC message• DTCH/ DCCH: UE ID included in MAC header
UE Node B Controlling RNC
Preamble
Preamble
Preamble
Acquisition Indication (AICH)
PRACH Message
Resourcing Node BHardware
RACHFP
RACH Message[RRC Connection Request]
CRC Check
RACHFP
Persistency check before
UMTS Networks 7Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
RRC Connection SetupReasons for RRC connection setup:• Call setup (mobile-originated and mobile-terminated calls)
– Conversational call– Streaming call– Interactive call– Background call– Emergency call– Call re-establishment
• Exchange of signaling messages (low/high priority)
RRC connection request message contains, e.g.• IMSI, TMSI, IMEI• Location area, routing area identity, etc.• Other information: e.g. HSDPA/ E-DCH UE capability, standards release
UMTS Networks 8Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
NAS Signaling Connection Establishment(Transaction Reasoning)
UE Servin gRN C
C N
1. RRC C on n ection E stablish m en t
RRCRRC2. D C C H : In itia l D irect T ran sfer
RA N A P RA N A P3. In itia l UE M essage
Payload contains system network message: Information about the transaction initiated by the UE (IMSI, TMSI, location area, kind of requested transaction)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 9Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Authentication and Security Control
Authentication request/response: mutual authentication of UE and networkSecurity mode command/complete: CN domain indicates to UTRAN and UE the encryption
details (method/algorithms and encryption keys)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 10Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Transition Setup and RAB Establishment (CS Mode)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 11Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Transition Setup and RAB Establishment (PS Mode)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 12Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
RAB Establishment
Example: Synchronised establishment of a RAB on DCH
RAB Assignment Response
Radio Bearer Setup Complete
Radio Bearer Setup
Radio Link Reconfiguration Commit
Radio Link Reconfiguration Ready
Radio Link Reconfiguration Prepare
RAB Assignment
CN SRNCNodeBUE
ALCAP Iu Transport Bearer Establishment
ALCAP Iub Transport Bearer Establishment
Node B – RNC Data Transport Bearer Sync
Cell DCH
Activation Time , TActivation
Cell_DCH/ Cell FACH When CS CN When Cell_FACH:
RL Setup
UMTS Networks 13Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Transaction Release and RAB Release (CS Mode)
Note: signaling connection and RRC connection remains
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 14Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Transaction Release and Iu Release (CS Mode)
Note: signaling connection and RRC connection are released
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 15Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Transaction Release and RAB Release (PS Mode)
Note: signaling connection and RRC connection remain
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 16Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Transaction Release and Iu Release (PS Mode)
Note: signaling connection and RRC connection are released
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 17Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
RRC Connection ReleasePaging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UMTS Networks 18Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
RRC Connection Release (involving DRNC)Example: RRC connection release of a dedicated channel in soft HO mode
with DRNC
10. R adio L ink D eletio n R espo nse
8. R adio L ink D eletio n
9 . R adio Link D eletio n R espo nse
6 . R adio L ink D eletio n
5. R R C C o nnectio n R elease C o mplete
4 . R R C C o nnectio n R elease
11. R adio Link D eletio n R espo nse
7. R adio L ink D eletio n
U E N o de BD rift R N S
N o de BServing R N S
D rift R N C
ServingR N C
C N
R R C
R R CR R C
N B A P
N B AP
R N SAP
N B A P N B AP
N B A P
R N S AP
R A N AP
R A N AP
3. A LC A P Iu B earer R elease
ALC AP Iur B earer R elease 13. A LC A P Iub B earer R elease
12 . ALC AP Iub B earer R elease
1 . Iu R elease C o mmand
2. Iu R elease C o mplete
R R C
R A N AP
N B AP
R N S AP
N B A P
N B AP
R N SAP
R A N AP
UMTS Networks 19Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Soft Handover – Radio Link Addition UE SRNC Target
Node B DRNC
ALCAP Iur bearer Setup
Active Set Update (Radio Link Addition)
ALCAP Iub Data Transport bearer Setup
RNC Decides to add a new Radio Link
Target Node B is ready
UE starts Rx on new radio link
E.g. new neighbour cell list
Radio Link Restore IndicationRadio Link Restore Indication
Active Set Update Complete
Measurement Control
start Rx
start Tx
When RL Setup
Radio Link Add/ Setup Request
Radio Link Add/ Setup Response
Radio Link Add/ Setup Request
Radio Link Add/ Setup Response
Unsynchronized addition
UMTS Networks 20Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Soft Handover – Radio Link Deletion
UE SRNC Node B DRNC
Free-up resources of old NodeB
Active Set Update (Radio Link Deletion)
UE stops Rx on old radio link
E.g. new neighbour cell list
Active Set Update Complete
Measurement Control
Radio Link Deletion Request
ALCAP Iur bearer Release ALCAP Iub Data Transport bearer Release
RNC Decides to delete an existing Radio Link
Radio Link Deletion Request
Radio Link Deletion ResponseRadio Link Deletion Response
stop Rx & Tx
Unsynchronized deletion
UMTS Networks 21Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Inter-system Handover (UMTS to GSM)
UE 2G MSCSRNC 3G MSC
Channel activation procedure in BSS
Relocation Required
UE switches to GSM BSS
HO Complete
MAP Prepare HO Response
RNC Decides to perform HO to GSM
HO from UTRAN Command
BSC
MAP Prepare HO Req.HO Request
HO Request ACK
Relocation Command
Radio Link Failure in UTRAN and Radio Link Establishment in GSM BSS
Iu Release Procedure
HO Complete
MAP Send End Signal Req.
Free up of Resources
MAP Send End Signal Resp.
o
UMTS Networks 22Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
UTRAN Initiated UMTS-GPRS Cell Reselection
UE SGSN Serving RNC
RANAP RANAP 6. Iu Release Command
RANAP RANAP 7. Iu Release Complete
RRC RRC
2. Cell Change Order from UTRAN
3. The UE accesses the GSM system and initiates routing area update. The packet context is transferred to the new SGSN.
RANAP RANAP 4. SRNS Context Request
RANAP RANAP 5. SRNS Context Response
1. UTRAN decision to perform Cell Change Order from UTRAN:
Most signalling between 2G and 2G CN
o
UMTS Networks 23Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
SRNS Relocation (CS)
o
UMTS Networks 24Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
UE RRC Connected States
• Cell_DCH– Dedicated Traffic and Control carried over DCH
• Cell_FACH– Dedicated Traffic and Control carried over RACH/ FACH
• URA_PCH– No air interface resources required, “dormant” RB– UE receives paging on UTRAN Routing Area (URA) basis rather than
standard routing area (RA); URA usually in the order of 10 cells
Cell FACH
Cell DCHURA PCHNo data
No data
Data activity
Data activity
Low traffic
High trafficor CS call
Dynamic RBreconfigure
Cell FACH
Cell DCHURA PCHNo data
No data
Data activity
Data activity
Low traffic
High trafficor CS call
Dynamic RBreconfigure
optional
o
UMTS Networks 25Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
URA_PCH to CELL_DCH/ CELL_FACH Transition
Unsynchronised procedure with CRNC = SRNC
UE Node B SRNC
Cell_DCH: Radio Bearer Reconfiguration Complete (DCCH AM, DCH)
Cell_FACH: UTRAN Mobility Confirm (DCCH AM, RACH)
Radio Link Setup request
UE Transitions to Cell DCH/ stays in Cell_FACH
UE Sends Complete Message
L2 ACK (DCCH)
Radio Link Setup response
Radio Link Restore Indication Cell_DCH/ Cell_FACH
Cell Update Confirm(CCCH, FACH, UM)
ALCAP Iub Data Transport bearer Setup
URA PCH
UE temporary in Cell_FACH
If Cell_DCH Incl. DBC check
For each DCH, separately Incl. UL/ DL Synch.
Cell Update (CCCH, RACH, TM, cause “paging response” or ”Uplink Data transmission”)
RRC State Indicator Cell_DCH/ URA_FACH TActivation = ‘NOW’
o
UMTS Networks 26Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
CELL_FACH to CELL_DCH Transition
UE Node B RNC CN
Radio Bearer Reconfiguration Complete (DCCH AM, DCH)
Radio Bearer Reconfiguration (DCCH, FACH)
Radio Link Setup request
Radio Link Setup response
UE Transitions to Cell DCH
UE Sends Complete Message on DCH
L2 ACK (DCH)
RNC determines UE should transition to Cell DCH
Radio Link Restore Indication
RNC Stops MAC-d Transmission to UE
Cell FACH
Cell DCH
ALCAP for both DCH
FP Synch
Unsynchronised procedure with CRNC = SRNC
o
UMTS Networks 27Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
CELL_DCH to URA_PCH/ CELL_FACH Transition
Unsynchronised procedure with CRNC = SRNC
UE Node B SRNC
Radio Link Deletion Request
RRC State Indicator Cell_FACH/ URA_PCH
L2 ACK (DCCH, FACH) UE Sends Complete Message on RACH
Radio Link Deletion Response
Cell_FACH/URA_PCH
ALCAP Iub Data Transport Bearer Release
Cell DCH
UE transitions to Cell_FACH and reads SIB
Free-up non-used DCH Resources
Radio Bearer Reconfiguration (DCCH, DCH, UM)
Radio Bearer Reconfiguration Complete(DCCH, RACH, AM)
RNC leaves time for L2 ACK being errored
o
UMTS Networks 28Andreas Mitschele-Thiel, Jens Mueckenheim November 2012
Dynamic Bearer Reconfiguration UE SRNC
Radio Link Reconfig Prepare
Node B (Drift RNS)
Node B (Serving RNS)
DRNC
Radio Link Reconfiguration Prepare
Radio Link Reconfiguration Prepare
Radio Link Reconfiguration Ready Radio Link Reconfig Ready
Radio Link Reconfiguration Ready
ALCAP Iur bearer Setup
Radio Link Reconfig commit (TActivation) Radio Link Reconfiguration Commit (TActivation)
Radio Link Reconfiguration commit (TActivation)
Transport Channel Reconfiguration (DCCH, AM, TActivation)
Transport Channel Reconfiguration Complete (DCCH, AM)
ALCAP Iub Data Transport bearer Release
ALCAP Iub Data Transport bearer Release ALCAP Iur bearer Release
ALCAP Iub Data Transport bearer Setup
ALCAP Iub Data Transport bearer Setup
Cell DCH
Cell DCH
RNC Decides to change the rate of the UE
All Node B’s are ready
Activation Time , TActivation
UE & Node-B reconfigured to the new rates
Release the transport Network resources for the previous configuration
When rate increase
Synchronised DCH modify w/o transport bearer reconfiguration
o
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