UTRAN Procedures. MM procedures -> see MM slides CM procedures -> see CM slides

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1 UTRAN Procedures Elementary 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 slides CM procedures -> see CM slides References: Kaaranen ch. 10 (simple cases discussed here) 3GPP TR (more complicated cases) 1

2 Basic Model of UMTS Network Transactions Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release 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) UE indicates the CN the requested service Allocation of bearers to support required UMTS bearer service Transfer of data Release of all bearers to support UMTS bearer service 2

3 UE RRC Connected States optional C e ll F A C H D a ta a c tiv ity H ig h tra ffic o r C S c a ll N o d a ta L o w tra ffic D y n a m ic R B U R A P C H N o d a ta C e ll D C H re c o n fig u re D a ta a c tiv ity 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 3

4 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 Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release UE N o d e B 1.1 N o d e B 2.1 R N C 1 R N C 2 CN 1. P a g in g 1. P a g in g (Requesting CN domain, IMSI,...) 2. PCCH : P a g in g T yp e 1 3. PCCH : P a g in g T yp e 1 4

5 Paging Paging 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) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release UE S e rv in g R N C CN 1. P a g in g RRC 2. D C C H : P a g in g T y p e 2 RRC 2 cases: UTRAN coordinates the paging request with the existing RRC connection (given example) UE coordinates the paging request with the existing RRC connection 5

6 RRC Connection Setup UE N o d e B RNC CN U E _ Id le In itia l R a n d o m A c c e ss A d d r.: In itia l U E ID C C C H (T M )/ R A C H : R R C C o n n e c tio n R e q u e st R e q u e st fo r D C C H In c l. E sta b lish m e n t c a u se R L S e tu p R e q u e st Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release R L S e tu p R e sp o n se A L C A P Iu b T ra n sp o rt b e a re r S e tu p E sta b lish m e n t o f U T R A N D C H re so u rc e s in c l. C A C U L /D L S y n c h ro n isatio n C C C H (U M )/ F A C H : R R C C o n n e c tio n S e tu p A d d r.: In itia l U E ID C E L L _ D C H D C C H (A M )/ D C H : R R C C o n n e c tio n S e tu p C o m p le te A d d r.: b y D C H D C C H e sta b lish e d U E c a p a b ilitie s k n o w n Establishment of a RRC connection in cell_dch mode 6

7 Initial Random Access UE N o d e B C o n tro llin g RNC P e rsiste n c y c h e c k b e fo re P re a m b le P re a m b le P re a m b le R e s o u rc in g N o d e B H a rd w a re A c q u is itio n In d ic a tio n (A IC H ) P R A C H M e s s a g e C R C C h e c k R A C H F P R A C H M e s s a g e [R R C C o n n e c tio n R e q u e s t] R A C H F P UE addressing CCCH: UE ID embedded in the RRC message DTCH/ DCCH: UE ID included in MAC header 7

8 RRC Connection Setup Reasons 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 8

9 NAS Signaling Connection Establishment (Transaction Reasoning) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release UE S er v in g R N C CN 1. R R C C o n n ectio n E sta b lish m en t RRC 2. D C C H : In itia l D ir ect T r a n sfer RRC 3. In itia l U E M essa g e Payload contains system network message: Information about the transaction initiated by the UE (IMSI, TMSI, location area, kind of requested transaction) 9

10 Authentication and Security Control Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release Authentication request/response: mutual authentication of UE and network Security mode command/complete: CN domain indicates to UTRAN and UE the encryption details (method/algorithms and encryption keys) 10

11 Transition Setup and RAB Establishment (CS Mode) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release 11

12 Transition Setup and RAB Establishment (PS Mode) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release 12

13 RAB Establishment UE N o d e B S R N C CN R A B A ssig n m e n t A L C A P Iu T ra n sp o rt B e a re r E sta b lish m e n t C e ll_ D C H / C e ll_ F A C H R a d io L in k R e c o n fig u ra tio n P re p a re R a d io L in k R e c o n fig u ra tio n R e a d y W h e n C e ll_ F A C H : R L S e tu p W h e n C S C N A L C A P Iu b T ra n sp o rt B e a re r E sta b lish m e n t N o d e B R N C D a ta T ra n sp o rt B e a re r S y n c R a d io L in k R e c o n fig u ra tio n C o m m it A c tiv a tio n T im e, T A c tiv a tio n R a d io B e a re r S e tu p R a d io B e a re r S e tu p C o m p le te R A B A ssig n m e n t R e sp o n se C e ll_ D C H Example: Synchronised establishment of a RAB on DCH 13

14 Transaction Release and RAB Release (CS Mode) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release Note: signaling connection and RRC connection remains 14

15 Transaction Release and Iu Release (CS Mode) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release Note: signaling connection and RRC connection are released 15

16 Transaction Release and RAB Release (PS Mode) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release Note: signaling connection and RRC connection remain 16

17 Transaction Release and Iu Release (PS Mode) Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release Note: signaling connection and RRC connection are released 17

18 RRC Connection Release Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release 18

19 RRC Connection Release (involving DRNC) Example: RRC connection release of a dedicated channel in soft HO mode with DRNC UE N o d e B D rift R N S N o d e B S e rv in g R N S D rift R N C S e rv in g R N C CN 1. Iu R e le a se C o m m a n d 2. Iu R e le a se C o m p le te 3. A L C A P Iu B e a re r R e le a se RRC 4. R R C C o n n e c tio n R e le a se RRC RRC 5. R R C C o n n e c tio n R e le a se C o m p le te RRC N B A P 6. R a d io L in k D e le tio n N B AP R N S A P 7. R a d io L in k D e le tio n RN S AP N B A P 8. R a d io L in k D e le tio n N B A P N B A P 9. R a d io L in k D e le tio n R e sp o n se N B AP N B A P 1 0. R a d io L in k D e le tio n R e sp o n se N B A P 1 1. R a d io L in k D e le tio n R e sp o n se R N S A P RN S AP 1 2. A L C A P Iu b B e a re r R e le a se 1 3. A L C A P Iu b B e a re r R e le a se A L C A P Iu r B e a re r R e le a se 19

20 Soft Handover Radio Link Addition UE T a rg e t N o d e B D R N C S R N C R a d io L in k A d d / S e tu p R e q u e st R a d io L in k A d d / S e tu p R e q u e st R N C D e c id e s to a d d a n e w R a d io L in k sta rt R x R a d io L in k A d d / S e tu p R e sp o n se R a d io L in k A d d / S e tu p R e sp o n se A L C A P Iu b D a ta T ra n sp o rt b e a re r S e tu p A L C A P Iu r b e a re r S e tu p W h e n R L S e tu p sta rt T x R a d io L in k R e sto re In d ic a tio n A c tiv e S e t U p d a te (R a d io L in k A d d itio n ) R a d io L in k R e sto re In d ic a tio n T a rg e t N o d e B is re a d y A c tiv e S e t U p d a te C o m p le te U E sta rts R x o n n e w ra d io lin k M e a su re m e n t C o n tro l E.g. n e w n e ig h b o u r c e ll list Unsynchronized addition 20

21 Soft Handover Radio Link Deletion UE Node B DRNC SRNC Active Set Update (Radio Link Deletion) RNC Decides to delete an existing Radio Link UE stops Rx on old radio link Active Set Update Complete Measurement Control E.g. new neighbour cell list Radio Link Deletion Request Radio Link Deletion Request Free-up resources of old NodeB stop Rx & Tx Radio Link Deletion Response Radio Link Deletion Response ALCAP Iub Data Transport bearer Release ALCAP Iur bearer Release Unsynchronized deletion 21

22 Inter-system Handover (UMTS to GSM) UE S R N C 3 G M S C 2 G M S C B S C R N C D e c id e s to p e rfo rm H O to G S M R e lo c a tio n R e q u ire d M A P P re p a re H O R e q. H O R e q u e st H O R e q u e st A C K C h a n n e l a c tiv a tio n p ro c e d u re in B S S M A P P re p a re H O R e sp o n se R e lo c a tio n C o m m a n d U E sw itc h e s to G S M B S S H O fro m U T R A N C o m m a n d R a d io L in k F a ilu re in U T R A N a n d R a d io L in k E sta b lis h m e n t in G S M B S S H O C o m p le te H O C o m p le te M A P S e n d E n d S ig n a l R e q. F re e u p o f R e so u rc e s Iu R e le a se P ro c e d u re M A P S e n d E n d S ig n a l R e sp. 22

23 UTRAN Initiated UMTS-GPRS Cell Reselection UE S e rv in g R N C S G S N 1. U T R A N d e c is io n to p e rfo rm C e ll C h a n g e O rd e r fro m U T R A N : R R C 2. C e ll C h a n g e O rd e r fro m U T R A N R R C 3. T h e U E a c c e sse s th e G S M s y ste m a n d in itia te s ro u tin g a r e a u p d a te. T h e p a c k e t c o n te x t is tra n s fe rre d to th e n e w S G S N. 4. S R N S C o n te x t R e q u e st 5. S R N S C o n te x t R e sp o n se 6. Iu R e le a se C o m m a n d 7. Iu R e le a se C o m p le te Most signalling between 2G and 2G CN 23

24 SRNS Relocation (CS) 24

25 URA_PCH to CELL_DCH/ CELL_FACH Transition UE N o d e B S R N C U R A _ P C H U E te m p o ra ry in C e ll_ F A C H C e ll U p d a te (C C C H, R A C H, T M, c a u se p a g in g re sp o n se o r U p lin k D a ta tra n s m is sio n ) R a d io L in k S e tu p re q u e st If C e ll_ D C H In c l. D B C c h e c k R a d io L in k S e tu p re sp o n se A L C A P Iu b D a ta T ra n sp o rt b e a re r S e tu p F o r e a c h D C H, se p a ra te ly In c l. U L / D L S y n c h. U E T ra n sitio n s to C e ll D C H / sta y s in C e ll_ F A C H U E S e n d s C o m p le te M e ssa g e C e ll_ D C H / C e ll_ F A C H C e ll U p d a te C o n fir m ( C C C H, F A C H, U M ) R a d io L in k R e sto re In d ic a tio n C e ll_ D C H : R a d io B e a re r R e c o n fig u ra tio n C o m p le te (D C C H A M, D C H ) C e ll_ F A C H : U T R A N M o b ility C o n fir m (D C C H A M, R A C H ) L 2 A C K (D C C H ) R R C S ta te In d ic a to r C e ll_ D C H / U R A _ F A C H T A c tiv a tio n = N O W Unsynchronised procedure with CRNC = SRNC 25

26 CELL_FACH to CELL_DCH Transition UE N o d e B R N C CN C e ll F A C H R a d io L in k S e tu p re q u e st R a d io L in k S e tu p re sp o n se R N C d e te rm in e s U E sh o u ld tran sitio n to C e ll D C H A L C A P fo r b o th D C H U E T ra n sitio n s to C e ll D C H C e ll D C H R a d io B e a re r R e c o n fig u ra tio n (D C C H, F A C H ) F P S y n c h R a d io L in k R e sto re In d ic a tio n R N C S to p s M A C -d T ra n s m issio n to U E U E S e n d s C o m p le te M e ssa g e o n D C H R a d io B e a re r R e c o n fig u ra tio n C o m p le te (D C C H A M, D C H ) L 2 A C K (D C H ) Unsynchronised procedure with CRNC = SRNC 26

27 CELL_DCH to URA_PCH/ CELL_FACH Transition UE N o d e B S R N C C e ll_ D C H U E tra n sitio n s to C e ll_ F A C H a n d re a d s S IB R a d io B e a re r R e c o n fig u ra tio n (D C C H, D C H, U M ) R a d io B e a re r R e c o n fig u ra tio n C o m p le te (D C C H, R A C H, A M ) R R C S ta te In d ic a to r C e ll_ F A C H / U R A _ P C H U E S e n d s C o m p le te M e ssa g e o n R A C H L 2 A C K (D C C H, F A C H ) R N C le a v e s tim e fo r L 2 A C K b e in g e rro re d C e ll_ F A C H / U R A _ P C H R a d io L in k D e le tio n R e q u e st R a d io L in k D e le tio n R e sp o n s e F re e -u p n o n -u se d D C H R e so u rc e s A L C A P Iu b D a ta T ra n sp o rt B e a re r R e le a se Unsynchronised procedure with CRNC = SRNC 27

28 Dynamic Bearer Reconfiguration UE N o d e B (D rift N o d e B D R N C (S e rv in g S R N C C e ll D C H R N S ) R N S ) R a d io L in k R e c o n fig R a d io L in k R e c o n fig u ra tio n P re p a re P re p a re R N C D e c id e s to c h a n g e th e ra te o f th e U E R a d io L in k R e c o n fig u ra tio n P re p a re R a d io L in k R e c o n fig u ra tio n R e a d y R a d io L in k R e c o n fig R e a d y R a d io L in k R e c o n fig u ra tio n R e a d y A L C A P Iu b D a ta T ra n sp o rt b e a re r S e tu p A L C A P Iu r b e a re r S e tu p W h e n ra te in c re a se A L C A P Iu b D a ta T ra n sp o rt b e a re r S e tu p R a d io L in k R e c o n fig c o m m it (T A c tiv a tio n ) R a d io L in k R e c o n fig u ra tio n C o m m it ( T A c tiv a tio n ) A ll N o d e B s a re re a d y A c tiv a tio n T im e, T A c tiv a tio n R a d io L in k R e c o n fig u ra tio n c o m m it ( T A c tiv a tio n ) T ra n sp o rt C h a n n e l R e c o n fig u ra tio n (D C C H, A M, T A c tiv a tio n ) U E & N o d e -B re c o n fig u re d to th e n e w ra te s C e ll D C H T ra n sp o rt C h a n n e l R e c o n fig u ra tio n C o m p le te (D C C H, A M ) A L C A P Iu b D a ta T ra n sp o rt b e a re r R e le a se A L C A P Iu r b e a re r R e le a se A L C A P Iu b D a ta T ra n sp o rt b e a re r R e le a se R e le a se th e tra n sp o rt N e tw o rk re so u rc e s fo r th e p re v io u s c o n fig u ra tio n Synchronised DCH modify w/o transport bearer reconfiguration 28

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