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RRC Modes,System Information, Paging, and Update Procedures
3GRPLS (RN3155) – Module 3
Part I: RRC Modes
Part II: System Information and RRC Modes
Part III: Paging and RRC Modes
Part IV: RRC Connection Mobility Management and RRC Modes
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Part IRRC Modes
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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)
CellReselection
Initiationof a TBF
Releaseof aTBF
(MS camps on a GERAN cell)
(adopted from TS 25.331 V3.12.0)
RRC Modes Diagram
TBF: Temporary Block Flow
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Active Setcell
Active Setcell
• DCCH and – if configured – DTCH• Dedicate physical channel in use• UE location known on Active Set AS
cell level• UE responsible for measurement
reporting• UE performs Handover (Soft or Hard)• RRC messages on DCCH
CELL_DCH State
Cell_DCH substate required
for data transfer via HSDPA (HS-DSCH)
and HSUPA (E-DCH)!!
(Changing in 3GPP Rel. 7 with „enhanced Cell_FACH“)
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servingcell
• DCCH and – if configured – DTCH• FACH used for higher layer data DL
transfer, • UE monitors FACH permanently• UL 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 &
DCCH• from Rel. 7 on: HSDPA resources can be
used in Cell_FACH; allowing fast & smooth transition from Cell_FACH to Cell_DCH
CELL_FACH State
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URA – UTRAN Registration Area
URA 1
URA 2URA 3
RNCsupply
area
• one or several cells• independent from LA /RA• 1 cell can belong to several
URA (NSN*: up to 8)
• no DCCH and DTCH• UL transmission UE moves to CELL_FACH• DL transmission: UE must be paged; UE turn to
CELL_FACH• RRC messages on BCCH & 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 URA re-selection and URA updates
CELL_PCH and URA_PCH State
*URAIdList: a maximum of 8 URA identities can be defined per cell.
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Both CELL_FACH and CELL_DCH possible
Real time &non-real time bearers
allocated
RRC connection(no bearers allocated)First RT bearer
setup
Last RT bearerreleased
Real time bearer(s)allocated
Non-real timebearer(s) allocated
Last NRTbearer released
Last NRT bearerreleased
Last RT bearerreleased
First NRT bearersetup
NRTbearersetup
RT bearersetup
RT or NRTbearer setup
RT bearer setupNRT bearer
setup
RRC connectionestablished
RRC connectionreleased
Only CELL_DCH allocation possible
States of Bearer Allocation
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• WCEL: URAId•The URA identity is the identity of the UTRAN Registration Area.•Overlapping URAs can be defined.•A maximum of eight URA identities can be defined per cell.•This parameter is part of System Information Block 2.•[1 ... 65535], step 1.
• WCEL: URAIdList•A list of URA identities.•A maximum of 8 URA identities can be defined per cell.•The first URA-ID in the URA-ID list is a master URA-ID, which is given to all mobile stations in this cell.•This parameter is part of System Information Block 2.
NSN Parameters for the UTRAN Registration Area (URA)
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Part IISystem Information and RRC Modes
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Node B
UTRANSystem Information ( )
UE RNC
NBAP: BCCH Information
MIBvalue tag M
SIB 1value tag 1
SIB 2value tag 2
SIB 3value tag 3
SIB 18value tag 18
position on P-CCPCH: SFN mod 8* = 0TTI: 20 msvalue tag M: range 1..8
SBvalue tag N
System InformationTS 25.331: RRC
10.2.48: SYSTEM INFORMATION
TS 25.331: RRC10.2.48: SYSTEM INFORMATION
TS 25.433: NBAP8.2.16 System Information Update
TS 25.433: NBAP8.2.16 System Information Update
*every 8th radio frame; value tag unchanged corresponding SIB not modified no need to readSIB 7: w/o value tag; changing with each occurrence
MIB: Master Information Block
SIB: System Information Block
SFN: System Frame Number
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SIB broadcasted information read scope/modification
MIB • PLMN types & identities#
• SIB Scheduling information• SIB references
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH
cell/value tag
valid
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH
SIB 1 • NAS information• UE timers & counters
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH
PLMN/value tag
RRC idle mode,CELL_DCH, CELL_FACH,
CELL_PCH, URA_PCH
SIB 2 • URA identity list URA_PCH cell/value tag
URA_PCH
SIB 4* • Cell selection & re-selection parameters for UEs in the connected mode
CELL_FACH, CELL_PCH, URA_PCH
cell/value tag
CELL_FACH, CELL_PCH, URA_PCH
SIB 3* • Cell selection and re-selection parameters°
RRC idle mode,(CELL_FACH, CELL_PCH,
URA_PCH)
cell/value tag
RRC idle mode,(CELL_FACH, CELL_PCH,
URA_PCH)
SIB 5* • Parameters for common physical channel configuration
RRC idle mode,(CELL_FACH,
CELL_PCH, URA_PCH)
cell/value tag
RRC idle mode,(CELL_FACH,
CELL_PCH, URA_PCH)
System InformationTS 25.331: RRC
System Information Blocks10.2.48.8.1 – 21: MIB & SIB 1-18
* Read SIB 3 / 5 in Connected Mode if SIB4 / 6 (Connected Mode) not available
# GSM-MAP/ANSI41; MCC+MNC; ° + Cell Access Restrictions
e.g. T305: Periodic Cell/URA UpdateT301, 302, 304, 307-317
e.g. CPICH Ec/N0 or CPICH RSCP; Sintrasearch, Sintersearch, Ssearch,RAT, Qqualmin, Qrxlevmin,..
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SIB broadcasted information read scope/modification
SIB 7 Fast changing parameters: • UL interference level• Dynamic persistence level
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH
cell/ max(32, 8 * Expir-‘ation Time Factor)
valid
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH
SIB 11 Measurement control information*
RRC idle mode,(CELL_FACH, CELL_PCH,
URA_PCH)
cell/value tag
RRC idle mode,(CELL_DCH, CELL_FACH,
CELL_PCH, URA_PCH)
SIB 12 • Measurement control information* for UEs in the RRC connected mode
CELL_FACH, CELL_PCH, URA_PCH
cell/value tag
CELL_DCH, CELL_FACH, CELL_PCH, URA_PCH
SIB 16 • RB, TrCH, and PhyCH parameters for a GSM/GPRS-UMTS HO
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH
cell/value tag
RRC idle mode,CELL_FACH, CELL_PCH,
URA_PCH)
(adopted from TS 25.331 RRC)
System Information
* e.g. FMCx & HOPx par.; Use of HCS; Ec/N0 orRSCP; Intra-, Inter-Frequency, Inter-RAT meas. info; Traffic volume meas. Info (e.g. RLC buffer payload)
Examples of other SIB’s:SIB 13: ANSI-41 system informationSIB 14: Only for 3.84 Mcps TDDSIB 15: useful for UE-based or UE-assisted positioning methods SIB 17: only for TDD SIB 18: contains PLMN identities of neighbouring cells to be considered in idle mode as well as in connected mode.
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Node B
UTRANPaging Type 1 ( )
(all paging occasions)
UE
RNC
System Information Change Indication ( )(on all FACH carrying S-CCPCHs)
I am RRC idle, or in the CELL_PCH
or URA_PCH state
I am in the CELL_FACH
state
IE BCCH Modification Change
MIB Value tag
BCCH modificationtime
SFN: 0..4088step size: 8
1..8
OP
Modification of SIBs using a Value Tag
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• RNC: SIB1_priority•The priority of the system information block 1, which is used by the scheduling algorithm in the RNC to give precedence to the SIB.•[1 ... 4], with 1 being the highest priority.•Similar NSN parameters exist for the remaining SIBs.
• WCEL: SIB7factor•This parameter sets the SIB7 expiration timer for the UE according to the following formula: MAX([320ms], SIB_REP* x value of 'SIB7 expiration time factor').•[1, 2, 4, 8, 16, 32, 64, 128, 256]; default: 1.
NSN Parameters for System Information
*SIB_REP is the Repetition Period of the System information block. Different System Information
can be scheduled more or less often here we refer to the Repetition period of SIB 7, which is not
configurable
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Part IIIPaging and RRC Modes
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UE RNC
Paging Type 1 [RLC-TM, PCCH]
UE S-RNC
Paging Type 2 [RLC-AM, DCCH]
Dedicated Paging
I am RRC idle, or in the CELL_PCH
or URA_PCH state
I am in the CELL_FACH or
CELL_DCH state
• MTC• system information changes• enforced cell update
• paging cause from higher layers
Paging
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Part IVRRC Connection Mobility Managementand RRC Modes
Cell Update URA Update Out of Coverage In-Sync, Out-Sync & Radio Link Failure
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UE RNC
[RLC-TM, CCCH] Cell Update
Cell Update Confirm [RLC-UM, CCCH/DCCH]
• no message (no transmission)• UTRAN Mobility Information Confirm• Physical Channel Reconfiguration Complete• Transport Channel Reconfiguration Complete• Radio Bearer Release Complete• Radio Bearer Channel Reconfiguration Complete
UE RNC
[RLC-TM, CCCH] Cell Update
RRC Connection Release [RLC-UM, CCCH/DCCH]
Cell Update
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UE RNC
[RLC-TM, CCCH] URA Update
URA Update Confirm [RLC-UM, CCCH/DCCH] • no message (no transmission)
• UTRAN Mobility Information Confirm
UE RNC
[RLC-TM, CCCH] URA Update
RRC Connection Release [RLC-UM, CCCH/DCCH]
UECell/URA Update
Cell/URA UpdateT302
noconfirmation
N302times
T302: default value = 2000 msN302: default value = 7
URA Update
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Cell update causes in priority order:• Uplink data transmission in URA_PCH, CELL_PCH• Paging response in URA_PCH, CELL_PCH• Radio link failure in CELL_DCH (*)• Re-entering service area in CELL_FACH, CELL_PCH• RLC unrecoverable error in all sub-states• Cell reselection in CELL_FACH, CELL_PCH• Periodical cell update in CELL_FACH, CELL_PCH
(*) or when the transmission of the RRC message UE Capability Information failed.
URA update causes in priority order:(the UE is in the URA_PCH sub-state)
• URA reselection• Periodic URA update
When do I have to
perform a cell/ URA update?
Cell and URA Update Initiation
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Out of coverage – RRC connected
URA_PCH
CELL_DCH
CELL_FACH
CELL_PCH
IDLE
In sync
Out of sync
In service area
Out of Service
area
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CELL_FACH state: CELL_PCH, URA_PCH
In service
area
Out of service
areaCell Reselection
Cell Reselection
Cell Update,Reason:
Re-enteringservice area
T316expired?
Yes
Cell Update, Reason:
Cell Reselection
No
Stop T316Stop T317
Start T317
Start T316
RRC Protocol States
Start T317
Stop T316Stop T317
OldCell
NewCell
Old Cell
Note: T305 isrunning
SIB 1:T316: 0, 10, 15, 20, 30, 40, 50 s & infinityT317: 0, 10, 30, 60, 180, 600, 1200, 1800 s; if expired: UE IDLE mode
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T305expired?
Cell Update, Reason:Periodic Cell Update
T307 expired?
EnterRRC Idle mode
Yes
No
Cell Reselection
T305expired?
Yes
URA Update, Reason:Periodic URA Update
Cell Update, Reason:Cell Reselection
No
In service
area
Out of service
area
Start T307Yes
CELL_FACH, CELL_PCH & URA_PCH state:
Periodic Updates & out of coverageT305: no update, 5, 10, 30, 60, 120 , 360, 720 min & infinity T307: 5, 10, 15, 20, 30, 40, 50 s
SIB 1:
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Physical channel establishment criteria
in sync indicators
N312 consecutivetimes
Start T312
Stop T312
T312 = 0
• Physical channel is considered established
• The timer T312 is stopped and reset
• Physical channel failure
• UE initiates synchronisation procedure
N312: max. # of "in sync" indications during establishment phase1, 2, 4, 10, 20, 50, 100, 200, 400, 600, 800, 1000; default: 4
T312: timer supervising successful PHY Channel establishment1..15 s; 1 s; default: 6 s
SIB 1:
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DL synchronisation status
Phase 2: • This phase starts 160 ms after the dedicated physical channel (was considered to be)
established.• The UE performs measurements and estimates the DPCCH quality over the previous 160
ms period. • An out of sync is detected, if EITHER
• The UE estimates the DPCCH quality over the previous 160 ms period to be worse than a threshold Qout.
OR• The 20 most recently received transport blocks with a non-zero length CRC attached, as
observed on all TrCHs using non-zero length CRC, have been received with incorrect CRC.
• An in sync is reported to the higher layers, when both• The UE estimates the DPCCH quality over the previous 160 ms period to be better than a
threshold Qin.AND• At least one transport block with a non-zero length CRC attached, as observed on all TrCHs
using non-zero length CRC, is received in a TTI ending in the current frame with correct CRC.
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DPCCH_Ec/Ior
time
Qin
Qout
Toff Ton
UE shuts power off UE shuts power on(adopted from TS25.101 V5)
160 ms
At least one TB in the last radioframe received with correct CRC in sync indication
160 ms
20 last TBs receivedwith incorrect CRC
out of sync indication
In Sync and Out of Sync on DL DPCCHs/DPDCHs
AND
OR
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serving cell
non-serving neighbouring cell
out of sync indicators
N313 consecutivetimes
N315 consecutivetimes
Start T313
in syncindicators
Stop T313
T313 = 0
• Start cell re-selection • Cell Update message
cause: Radio Link Failure• Start T314 & T315
Default values:• N313: 20• T313: 3s• N315: 1• T314: 12s• T315: 180s
radio bearerre-establishment time
Radio Link Failure in the CELL_DCH, Timing
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Summary of timers for UETimer Start Stop At expiry
T300 Transmission of RRC CONNECTION REQUEST Reception of RRC CONNECTION SETUP Retransmit RRC CONNECTION REQUEST if V300 =< N300, else go to Idle mode
T302 Transmission of CELL UPDATE/URA UPDATE Reception of CELL UPDATE CONFIRM/URA UPDATE CONFIRM
Retransmit CELL UPDATE/URA UPDATE if V302 =< N302, else, go to Idle mode
T304 Transmission of UE CAPABILITY INFORMATION Reception of UE CAPABILITY INFORMATION CONFIRM
Retransmit UE CAPABILITY INFORMATION if V304 =< N304, else initiate a cell update procedure
T305 Entering CELL_FACH or URA_PCH or CELL_PCH state. Reception of CELL UDPATE CONFIRM/URA UPDATE CONFIRM.
Entering another state. Transmit CELL UPDATE if T307 is not activated and the UE detects "in service area". Otherwise, if T307 is not active, start T307.
T307 When the timer T305 has expired and the UE detects "out of service area".
When the UE detects "in service area". Transit to idle mode
T308 Transmission of RRC CONNECTION RELEASE COMPLETE
Not stopped Transmit RRC CONNECTION RELEASE COMPLETE if V308 <=N308, else go to idle mode.
T312 When the UE starts to establish dedicated CH When the UE detects N312 "in sync" indication from L1.
The criteria for physical channel establishment failure is fulfilled
T313 When the UE detects consecutive N313 "out of sync" indication from L1.
When the UE detects consecutive N315 "in sync" indication from L1.
The criteria for Radio Link failure is fulfilled.
T314 When the criteria for radio link failure are fulfilled.The timer is started if radio bearer(s) that are
associated with T314 exist of if only RRC connection exists.
When the Cell Update procedure has been completed. See subclause 8.3.1.13.
T315 When the criteria for radio link failure are fulfilled.The timer is started only if radio bearer(s) that are
associated with T315 exist.
When the Cell Update procedure has been completed. See subclause 8.3.1.14.
T316 When the UE detects "out of service area" in URA_PCH or CELL_PCH state
When the UE detects "in service area". Initiate cell update procedure if in service area is detected. Otherwise start timer T317, transit to CELL_FACH state and initiate cell update procedure when the UE detects "in service area".
T317 When the T316 expires or when in CELL_FACH state, the UE detects "out of service area".
When the UE detects "in service area". T317 never expires.
(adopted from TS 25.331 V5.15.0)
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Summary of counters for UE
Counter Reset Incremented When reaching max value
V300 When initiating the procedure RRC connection establishment
Upon expiry of T300.
When V300 > N300, the UE enters idle mode.
V302 When initiating the procedure Cell update or URA update
Upon expiry of T302
When V302 > N302 the UE enters idle mode.
V304 When sending the first UE CAPABILITY INFORMATION message.
Upon expiry of T304
When V304 > N304 the UE initiates the Cell update procedure
V308 When sending the first RRC CONNECTION RELEASE COMPLETE message in a RRC connection release procedure.
Upon expiry of T308
When V308 > N308 the UE stops re-transmitting the RRC CONNECTION RELEASE COMPLETE message.
(adopted from TS 25.331 V5.15.0)
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Following counters and timers can be set:
• RNC: N302; default: 7
• RNC: T302; default: 2000 ms
• RNC: T305; default: 30 min
• RNC: T307; default: 30 s
• RNC: T316; default: 30 s
• RNC: T318; default: 180 s
• RNC: T313; default: 3 s
• RNC: N313; default: 20
• RNC: N315; default: 1
NSN Parameters
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