03 rn20103en14gln0 idle mode operation

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Idle Mode Operation

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1 Nokia Siemens Networks RN20103EN14GLN0

BSSPAR1: Chapter 3Idle Mode Operation

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Module Objectives

List the functions of the MS during the idle mode Explain the parameters used for PLMN selection, cell selection and cell

reselection State the purpose of location updates and the associated parameters

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When the MS is switched ON When there is no dedicated connection

When?

To camp on the best suitable cell

Why?

For MS to receive system info from the NW on DL For MS to be able to initiate a call whenever needed For the NW to be able to locate the MS when there is a MT call/SMS

Why to camp on a specific cell?

PLMN selection Cell selection & re-selection Location updates

Idle Mode Tasks

Idle Mode OperationI

MS switched ON

Search RF channels to find BCCH carrier

Check that the PLMN & cell is

allowed

MS camps on the best

suitable cell

See slide 10 for detail

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CM requestsNAS control radiomeasurements

PLMNselected

PLMNavailable

registrationarea changes

locationregistration

response

indicationto user

manual mode

locationregistration

cell selectionand reselection

PLMN selectionand reselection

automatic mode

Camping on a cell: Motivation

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Value

LAI (locationAreaId)

NCC (Network Colour Code) 0 7 BCC (BTS Colour Code) 0 7

BSIC (bsIdentityCode)

CI (cell-ID 0 65535

Parameter

TSC (trainingSequenceCode) 0 7

MCC (Mobile Country Code) 0 999 MNC (Mobile Network Code) 0 99,

0 999 (optional 3-digit MNC) LAC (Location Area Code) 1 65533

CGI (Cell Global Identity) MCC + MNC + LAC + CI

IDs and ID Codes

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Operator controlled PLMN list

User controlled PLMN list

Last registered PLMN or equivalent

PLMN

Home PLMN

Other PLMNs with RATs the MS is

capable of

Switch on in automatic PLMN selection operation mode

Timer Toften called HPLMN Search Timer6 .. 480 minutesDefault: 60 minutes

PLMN Selection

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Campednormally

(adopted from TS 43.022 V5.1.0 chap. 6

Connectedmode

Normalcell selection

Stored listcell selection

Choose cellNormal

cell re-selection

go here whenever anew PLMN is selected

BA list storedfor PLMN

no BA list storedfor PLMN 1

no suitable cell found

suitable cell foundsuitable cell found

trigger

Suitable cellre-selected

no suitablecell found

suitable cell found

leaveidle

mode

returnto idlemode



IMSI unknown Illegal MS PLMN not allowed

2

2

States and State Transition for Cell Selection

(continued on the next page)

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Any cellselection

Camped on

any cell

Choose cell

cell foundno suitablecell found

suitable cell found

leaveidle

mode

returnto idlemode

Connected mode (emergency call

only)

Anycell re-

selection

trigger

cellre-selected


go here when no SIM in MS SIM inserted in MS 1

2

cell foundon selected

PLMN

(adopted from TS 43.022 V5.1.0 chap. 6)

States and State Transition for Cell Selection

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Normal Cell SelectionSearch all the RF channels, take samples during

3-5 s and calculate averages. And put them in ascending order with respect to signal level.

Then tune to the strongest RF channel.

Search for the frequency correction burst in that carrier in order to verify if it is a BCCH carrier

Camp on the cell

Try to synchronize to the carrier and read the BCCH data

Is it a BCCH carrier?

Is it a correct PLMN ?

Is the cell barred?

Is C1>0

Tune to the next highest RF channel which is not

tried before

No

No

NoNo

Yes

Yes

Yes

Yes

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I am outside

I am inside, but have not enough

power

C1 = A max(B,0)= RLA_C RXLEV_ACCESS_MIN max(MS_TXPWR_MAX_CCH P , 0)

RLA_C = avg received RxLev on BCCHP = MS max output power

max(B

,0)

0..63 0..31

Pathloss Criterion C1 for Cell Selection and Reselection

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Cell1LAC1

C1 ( Cell1) C1 (Cell2)

A B C

A= 4 dBB= 6 dBC= 8 dB

Cell2LAC2

In case the neighbouring cells belong to different Location Area, a hysteresis is applied with C1 criteria minimizing ping-pong cell reselections cellReselectHysteresis (HYS)(BTS) (014 dB)

Cell Selection with C1

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C1 + CELL_RESELECT_OFFSET TEMPORARY OFFSET * H(PENALTY_TIME - T)for PENALTY_TIME 640 s

C1 - CELL_RESELECT_OFFSET for PENALTY_TIME = 640 sC2 =

serving cell: C2:

List of 6 strongest carriers: C2: C2: C2: C2: C2: C2:

0 .. 126 dBstep size: 2 dB

0, 10, 20, 30, 40, 50, 60, dB

20 .. 640 sstep size: 20 s

PENALTY_TIME

TEMPORARY OFFSET

CELL_RESELECT_OFFSET

C1

C2

T

new candidate= formerly non-

serving cell

CELL_RESELECT_OFFSET

C1

C2

T

new candidate= former serving

cell

no TEMPORARY OFFSET

Pathloss Criterion C2

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cell 1

cell 2

cell 3

C2

time5 seconds

cellreselection

5 seconds

CELL_RESELECT_HYSTERESIS (HYS)

LAC = A LAC = B

cell reselection &location update

Cell Reselection Based on Pathloss Criterion C2

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Cell "A" Cell "B" Cell "C" Cell "D"

cellReselectOffset 0 dB 20 dB 0 dB 0 dB

temporaryOffset 0 dB 30 dB 0 dB 30 dB

penaltyTime 20 s 20 s 20 s 40 s

Micro 900 "D"Macro 1800 "B"

Macro 900 "A"

Macro 900 "C"Road

Parameters

=30 Cell "A" (Serving Cell)=25 Cell "B"=5 Cell "C"=50 Cell "D"

=30 + 0 (H(x)=0, serving cell) Cell "A"=25 + 20 - 30*H(20 - T) Cell "B"=5 + 0 - 0*H(20 - T) Cell "C"=50 + 0 - 30*H(40 - T) Cell "D"

C1

C2 = C1 + cellReselectOffset -temporaryOffset*H(penaltyTime-T)

C2

Time T: (0 - 19 s)C2 =30 Cell "A"C2 =15 Cell "B"C2 =5 Cell "C"C2 =20 Cell "D"

Time T: (20 - 39 s)C2 =30 Cell "A"C2 =45 Cell "B"C2 =5 Cell "C"C2 =20 Cell "D"

Time T: (> 40 s)C2 =30 Cell "A"C2 =45 Cell "B"C2 =5 Cell "C"C2 =50 Cell "D"

Cell Reselection Based on Pathloss Criterion C2

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When shall I select a new cell?

Pathloss Criterion C1C1 0 for a period of 5 s

Pathloss Criterion C2 neighbours C2 value >

current cells C2 value (same LA) neighbours C2 value >

current cells C2 value + HYS(new LA)

for a period of 5 s.Downlink Signalling Failure

DSC 0

RACH FailureMAX RETRANS + 1 times

Authentication Failurenotification by upper layers

Cell has been barredCELL_BAR_ACCESS & CELL_BAR_QUALIFY

Cell Reselection Events

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BTS

BCCH (...,BS_

PA_MFRMS,..

.)

MS

Downlink radio link failure detected!

DSCinit := round BS_PA_MFRMS90

paging message successfully

decoded?

DSC 0

DSC := min (DSC+1, DSCinit) DSC := DSC - 4

yes no

no

yesCell

UpdateDSC = Downlink Signalling failure Counter

2..9 multi-frame periods

DSC := DSCinit

DL Signalling Failure

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Location Update Procedure

BSS MSC VLR HLR

REQUEST SUBSCRIBER INFO

ALL OK - HLR UPDATE

MS

LOCATION UPDATE REQUEST

SEND SUBSCRIBER ID

REQUEST SUBSCRIBER ID

SEND SUBSCRIBER INFO

AUTHENTICATION

AUTHENTICATION RESPONSE

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Paging LocUp

# of cells in Loc. area

signallingtraffic

optimum numberof cells in Loc. area

function of user density,cell size, call arrival rate ...function of

user mobility

Trade-off between Location Update and Paging Traffic

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Location Updates

MS location & status flag => MSC / VLR Mobile Station switched ON mode

IMSI Attach / Detach Same Location Area => No Location Update Different Location Area => Location Update

Change of the Location Area Location Area under the same MSC / VLR Location Area under another MSC / VLR => HLR will be updated

Service is rejected (MS unknown in VLR) Time-Periodic LU (MS -> MSC/VLR)

PER0.5 hDefines the interval between periodic MS location updates. The value 0 means that the periodic location update is not used.

0...25.5 h, step 0.1 h

timerPeriodicUpdateMs

BTS

ATTYesDefines whether IMSI attach/detach is used in the cell.Yes/NoallowIMSIAttachDetach

BTS

BSC -MML Name

Default value

DescriptionRange And Step

Abbreviated Name

MO Class

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60 12 25.512.5

BSS (BTS) parameter (ZEQO)

TIMER PERIODIC UPDATE MS 6 HRS

VLR Parameters (ZMXO)

IMPLICIT IMSI DETACH USEDIMPLICIT DEREGISTRATION 012 HRS. 30 MINLOITERING 00 DAYS 13 HRSVLR CLEANING START TIME 04:12

MS Makes the last contact with network

(MOC, MTC, SMS). If MS makes a IMSI

DETACH, the loitering time starts

MS Has not made a periodic LU till now. DETACH flag set.

No more paging for the MS; Loitering

time starts

MS Data cleaned up from VLR after Loitering time ends. In case the VLR cleaning time occurs

before this time, the MS data is cleaned earlier

MS does not make a periodic

LU. MS still kept Attached

in VLR.

MS does not make a periodic

LU. MS still kept Attached

in VLR.

Time

LU and VLR Cleaning

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