View
226
Download
5
Category
Preview:
Citation preview
UTRAN ProceduresElementary procedures
– Pagingg g– RRC connection setup– Transaction reasoning– Authentication and security controlAuthentication and security control– Transaction setup with RAB allocation– Transaction clearing and RAB release– RRC connection release– RRC connection release
RRM procedures– Radio link addition and deletion
I t t h d f UMTS t GSM (CS/PS)– Intersystem handover from UMTS to GSM (CS/PS)– UE state transitions/ bearer reconfiguration
MM procedures > see MM slidesMM procedures -> see MM slidesCM procedures -> see CM slides
References:
UMTS Networks 1Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
– Kaaranen ch. 10 (simple cases discussed here)– 3GPP TR 25.931 (more complicated cases)
Basic Model of UMTS Network TransactionsPagingPaging
RRC Connection Establishment
A transaction comprises all the elementary procedures required to enable
– the transport of user data (PS or CS RRC Connection Establishment
Transaction Reasoning(Signaling conn establishment)
mode) or– the exchange of higher-layer signaling
messages (e.g. MM or CM)(Signaling conn. establishment)
Authentication andSecurity UE indicates the CNy
Transaction Setup andRAB Allocation
UE indicates the CN the requested service
All ti f b t tTransaction
(user or control plane)
Allocation of bearers to support required UMTS bearer service
Transaction Release andRAB Release
Transfer of data
Release of all bearers to support
UMTS Networks 2Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
RRC Connection Releasepp
UMTS bearer service
PagingPaging
RRC Connection Establishment
T ti R i
Paging type 1:• UE idle mode (no RRC connection)
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation( )
• RRC connected modes cell_PCH or URA_PCH
Example: paging for a UE in idle mode
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseExample: paging for a UE in idle mode
UE N d B N d B RN C RN C C N
RRC Connection Release
UE N ode B1.1
N ode B2.1
RN C1
RN C2
C N
RA N A P RA N A P1. Pagin g
RA N A PRA N A P 1. Pagin g
2. PC C H : Pagin g T ype 1
(Requesting CN domain, IMSI, ...)
3 . PC C H : Pagin g T ype 1
UMTS Networks 3Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
PagingPaging
RRC Connection Establishment
T ti R i
Paging type 2:• UE is in RRC connected mode cell_DCH or cell_FACH
Paging eq est f om anothe CN domain
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation• Paging request from another CN domain
Example: paging for a UE in RRC Connected Mode
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Releasep p g g(CELL_DCH or CELL_FACH state)
U E Serving
R N CC N
RRC Connection Release
R N C
R A N A P R A N A P 1 . P aging
R R C R R C 2 . D C C H : P aging T ype 2
2 cases:• UTRAN coordinates the paging request with the existing RRC connection (given example)• UE coordinates the paging request with the existing RRC connection
UMTS Networks 4Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
• UE coordinates the paging request with the existing RRC connection
RRC Connection SetupPaging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
UE Node B RNC CN
UE_Idle
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
Initial Random Access
CCCH (TM)/ RACH: RRC Connection Request • Addr.: Initial UE ID• Request for DCCH• Incl. Establishment RRC Connection Release
RL Setup Request
RL Setup Response
cause
Establishment f UTRANALCAP Iub Transport bearer Setup
UL/DL Synchronisation
of UTRAN DCH resources incl. CAC
CCCH (UM)/ FACH: RRC Connection Setup Addr.: Initial UE ID
CELL_DCH
DCCH (AM)/ DCH: RRC Connection Setup Complete • Addr.: by DCH • DCCH established • UE capabilities
known
UMTS Networks 5Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Establishment of a RRC connection in cell_DCH mode
Initial Random Access
UE Node B Controlling RNC
Preamble
Preamble
Preamble
Persistency check before
Preamble
Acquisition Indication (AICH)
Resourcing Node BHardware
PRACH Message
CRC Check
RACHFP
RACH Message[RRC Connection Request]
RACHFP
UE addressing• CCCH: UE ID embedded in the RRC message
UMTS Networks 6Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
• CCCH: UE ID embedded in the RRC message• DTCH/ DCCH: UE ID included in MAC header
RRC Connection SetupReasons for RRC connection setup:• Call setup (mobile-originated and mobile-terminated calls)
– Conversational callConversational call– Streaming call– Interactive call– Background call– Emergency call– Call re-establishmentCall re establishment
• Exchange of signaling messages (low/high priority)
RRC ti t t iRRC connection request message contains, e.g.• IMSI, TMSI, IMEI• Location area, routing area identity, etc., g y,• Other information: e.g. HSDPA/ E-DCH UE capability, standards release
UMTS Networks 7Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
NAS Signaling Connection Establishment(Transaction Reasoning)
Paging
RRC Connection Establishment
T ti R i( a sact o easo g) Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UE Servin gRN C
C N
RRC Connection Release
1. RRC C on n ection E stablish m en t
2 D C C H : In itia l D irect T ran sferRRCRRC
2. 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
UMTS Networks 8Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Information about the transaction initiated by the UE (IMSI, TMSI, location area, kind of requested transaction)
Authentication and Security ControlPaging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
Authentication request/response: mutual authentication of UE and networkS it d d/ l t CN d i i di t t UTRAN d UE th ti
UMTS Networks 9Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Security mode command/complete: CN domain indicates to UTRAN and UE the encryption details (method/algorithms and encryption keys)
Transition Setup and RAB Establishment (CS Mode)
Paging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 10Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Transition Setup and RAB Establishment (PS Mode)
Paging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 11Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
RAB Establishment
CN SRNCNodeBUE
Radio Link Reconfiguration Prepare
RAB Assignment
ALCAP Iu Transport Bearer Establishment
Cell_DCH/ Cell FACH When CS CNWhen Cell_FACH:
Radio Link Reconfiguration Ready
ALCAP Iub Transport Bearer Establishment
Node B – RNC Data Transport Bearer Sync
Cell FACH When CS CN RL Setup
Radio Bearer Setup Complete
Radio Bearer Setup
Radio Link Reconfiguration Commit
Activation Time , TActivation
RAB Assignment Response
Cell DCH
Example: Synchronised establishment of a RAB on DCH
UMTS Networks 12Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Example: Synchronised establishment of a RAB on DCH
Transaction Release and RAB Release (CS Mode)
Paging
RRC Connection Establishment
T ti R i(CS Mode) Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 13Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Note: signaling connection and RRC connection remains
Transaction Release and Iu Release (CS Mode)
Paging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 14Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Note: signaling connection and RRC connection are released
Transaction Release and RAB Release (PS Mode)
Paging
RRC Connection Establishment
T ti R i(PS Mode) Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 15Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Note: signaling connection and RRC connection remain
Transaction Release and Iu Release (PS Mode)
Paging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 16Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Note: signaling connection and RRC connection are released
RRC Connection ReleasePaging
RRC Connection Establishment
T ti R iTransaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection ReleaseRRC Connection Release
UMTS Networks 17Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
RRC Connection Release (involving DRNC)Example: RRC connection release of a dedicated channel in soft HO modeExample: RRC connection release of a dedicated channel in soft HO mode
with DRNC U E N o de B
D ift R N SN o de B
S i R N SD rift R N C
ServingR N C
C N
D rift R N S Serving R N S R N C R N C
R A N AP
R A N AP
1. Iu R elease C o mmand
2. Iu R elease C o mplete
R A N AP
R A N AP
5. R R C C o nnectio n R elease C o mplete
4 . R R C C o nnectio n R eleaseR R C
R R CR R C
3. A LC A P Iu B earer R elease
R R C
6. R adio L ink D eletio n
7. R adio L ink D eletio n
R R CR R C
N B A P
R N SAP
N B AP
R N S AP
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 N B AP
N B A P N B AP
N B AP
N B A P
N B AP
11. R adio Link D eletio n R espo nse
N B AP
R N S AP
12. ALC AP Iub B earer R elease
N B AP
R N SAP
UMTS Networks 18Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
ALC AP Iur B earer R elease 13. A LC A P Iub B earer R elease
Soft Handover – Radio Link Addition UE SRNC Target
Node B DRNC
RNC Decides to add a new RadioRadio Link Add/ Setup Request add a new Radio Link
start Rx
Radio Link Add/ Setup Request
Radio Link Add/ Setup Response
ad o dd/ Setup equest
Radio Link Add/ Setup Response
ALCAP Iur bearer Setup ALCAP Iub Data Transport bearer Setup
Radio Link Restore Indication
When RL Setup
Radio Link Add/ Setup Response
Active Set Update (Radio Link Addition)
Target Node B is ready
Radio Link Restore IndicationRadio Link Restore Indication
start Tx
UE starts E.g. new neighbour cell list
Active Set Update Complete
Rx on new radio link
neighbour cell listMeasurement Control
UMTS Networks 19Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Unsynchronized addition
Soft Handover – Radio Link Deletion
UE SRNC Node B DRNC
Active Set Update (Radio Link Deletion)
Active Set Update Complete
RNC Decides to delete an existing Radio Link
UE stops Rx on old radio link
E.g. new neighbour cell list
p p
Measurement Control
Free-up resources of old NodeB
Radio Link Deletion RequestRadio Link Deletion Request
A CA b lA CA b b l
Radio Link Deletion ResponseRadio Link Deletion Response
stop Rx & Tx
ALCAP Iur bearer ReleaseALCAP Iub Data Transport bearer Release
UMTS Networks 20Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Unsynchronized deletion
Inter-system Handover (UMTS to GSM)
UE 2G MSCSRNC 3G MSC
RNC Decides to
BSC
Channel activation procedure in BSS
Relocation RequiredRNC Decides to perform HO to GSM MAP Prepare HO Req.
HO Request
HO Request ACK
UE switches GSM BSS
MAP Prepare HO Response
HO from UTRAN Command
q
Relocation Command
to GSM BSS
HO Complete
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 ResourcesResources
MAP Send End Signal Resp.
UMTS Networks 21Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
UTRAN Initiated UMTS-GPRS Cell Reselection
UE SGSN Serving RNC
2 C ll Ch O d f
1. UTRAN decision to perform Cell Change Order from UTRAN:
RRC RRC
2. Cell Change Order from UTRAN
3. The UE accesses the GSM system and initiates routing area RANAP RANAP
4. SRNS Context Request
6 I R l C d
system and initiates routing area update. The packet context is transferred to the new SGSN.
RANAP RANAP
RANAP RANAP 5. SRNS Context Response
RANAP RANAP 6. Iu Release Command
RANAP RANAP 7. Iu Release Complete
UMTS Networks 22Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Most signalling between 2G and 2G CN
UE RRC Connected States
Cell FACHCell FACHoptional
Data activity
L
High trafficor CS call
Data activity
L
High trafficor CS call
Cell DCHURA PCHNo data
No dataLow traffic
Dynamic RBreconfigure
Cell DCHURA PCHNo data
No dataLow traffic
Dynamic RBreconfigure
• Cell_DCH
Cell DCHURA PCH
Data activity
Cell DCHURA PCH
Data activity
– Dedicated Traffic and Control carried over DCH• Cell_FACH
– Dedicated Traffic and Control carried over RACH/ FACH– Dedicated Traffic and Control carried over RACH/ FACH• URA_PCH
– No air interface resources required, “dormant” RB
UMTS Networks 24Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
– UE receives paging on UTRAN Routing Area (URA) basis rather than standard routing area (RA); URA usually in the order of 10 cells
URA_PCH to CELL_DCH/ CELL_FACH Transition
UE Node B SRNC
URA PCH
UE temporary in C ll FACH
Cell Update (CCCH, RACH, TM, cause “paging response” or ”Uplink Data transmission”)
Radio Link Setup request
Radio Link Setup response
Cell_FACHIf Cell_DCH Incl. DBC check
For each DCH, t l
UE Transitions to Cell DCH/ stays in Cell_FACH
Cell Update Confirm(CCCH, FACH, UM)
ALCAP Iub Data Transport bearer Setup separatelyIncl. UL/ DL Synch.
RRC State Indicator Cell_DCH/ URA FACH
Cell_DCH: Radio Bearer Reconfiguration Complete (DCCH AM, DCH)
C ll FACH UTRAN M bili C fi (DCCH AM RACH)UE Sends Complete
Radio Link Restore Indication Cell_DCH/ Cell_FACH
URA_FACHTActivation = ‘NOW’
Cell_FACH: UTRAN Mobility Confirm (DCCH AM, RACH)UE Sends Complete Message
L2 ACK (DCCH)
UMTS Networks 25Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Unsynchronised procedure with CRNC = SRNC
CELL_FACH to CELL_DCH Transition
UE Node B RNC CN
Radio Link Setup request
Radio Link Setup responseRNC determines UE should transition to
Cell FACH
Radio Link Setup response Cell DCH
ALCAP for both DCH
Radio Bearer Reconfiguration (DCCH, FACH) UE Transitions to Cell DCH
R di Li k R I di i
RNC Stops MAC-d Transmission to UE
C ll DCH
FP Synch
Radio Bearer Reconfiguration Complete (DCCH AM, DCH)UE Sends Complete Message on DCH
L2 ACK (DCH)
Radio Link Restore Indication Cell DCH
UMTS Networks 26Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Unsynchronised procedure with CRNC = SRNC
CELL_DCH to URA_PCH/ CELL_FACH Transition
UE Node B SRNC
RRC State Indicator Cell_FACH/ URA_PCH
Cell DCH
UE transitions to Cell FACH and
Radio Bearer Reconfiguration (DCCH, DCH, UM)
L2 ACK (DCCH, FACH) UE Sends Complete Message on RACH
_reads SIB Radio Bearer Reconfiguration Complete(DCCH, RACH, AM)
RNC leaves time for L2 ACK being errored
Radio Link Deletion Request
Cell_FACH/URA_PCH
errored
Radio Link Deletion Response Free-up non-used DCH Resources
ALCAP Iub Data Transport Bearer Release
UMTS Networks 27Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Unsynchronised procedure with CRNC = SRNC
Dynamic Bearer Reconfiguration UE SRNC
Radio Link Reconfig Prepare
Node B (Drift RNS)
Node B (Serving RNS)
DRNC
R di Li k R fi ti PCell DCH RNC Decides to
change the rate ofPrepareRadio Link Reconfiguration Prepare
Radio Link Reconfiguration Prepare
Radio Link Reconfiguration Ready Radio Link Reconfig Ready
di i k fi i d
change the rate of the UE
Radio Link Reconfiguration Ready
ALCAP Iur bearer Setup ALCAP Iub Data Transport bearer Setup
ALCAP Iub Data Transport bearer Setup
When rate increase
Radio Link Reconfig commit (TActivation) Radio Link Reconfiguration Commit (TActivation)
Radio Link Reconfiguration commit (TActivation)
ALCAP Iub Data Transport bearer SetupAll Node B’s are ready
Activation Time g ( Activation)
Transport Channel Reconfiguration (DCCH, AM, TActivation)
Transport Channel Reconfiguration Complete (DCCH, AM)
, TActivation
UE & Node-B reconfigured to
Release the transport Network resources for h i
ALCAP Iub Data Transport bearer Release
ALCAP Iub Data Transport bearer Release ALCAP Iur bearer Release
Cell DCH
reconfigured to the new rates the previous
configuration
UMTS Networks 28Andreas Mitschele-Thiel, Jens Mueckenheim November 2009
Synchronised DCH modify w/o transport bearer reconfiguration
Recommended