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© NOKIA BSSPAR FOR S9 / 21.02.2000 / Cellular Network Planning page: 1 IDLE MODE OPERATION IDLE MODE OPERATION BSSPAR S9

idle modes 2G

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Page 1: idle modes 2G

© NOKIA BSSPAR FOR S9 / 21.02.2000 / Cellular Network Planning page: 1

IDLE MODE OPERATIONIDLE MODE OPERATION

BSSPAR S9

Page 2: idle modes 2G

© NOKIA BSSPAR FOR S9 / 21.02.2000 / Cellular Network Planning page: 2

IDLE MODE OPERATIONIDLE MODE OPERATIONContentsContents

1. IDLE Mode tasks overview

2. ID’s and ID Codes , Frequencies

3. PLMN selection

4. Cell selection and cell reselection

C1 Algorithm

C2 Algorithm

5. Location Area Management (as in Radio Resource Management)

Location Updates

Time Periodic Location Update

6. IMSI Attach/Detach

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© NOKIA BSSPAR FOR S9 / 21.02.2000 / Cellular Network Planning page: 3

IDLE MODE OPERATION IDLE MODE OPERATION

When the MS is switched ONWhen there is no dedicated connection

To camp on the best suitable cell

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

When?

Why?

Why to camp on a specific cell?

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IDLE MODE OPERATION IDLE MODE OPERATION Idle Mode TasksIdle Mode Tasks

• PLMN selection

• Cell selection and reselection

• Location update

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locationAreaId

• ncc (Network Colour Code) 0 … 7• bcc (BTS Colour Code) 0 … 7

bsIdentityCode

cell-ID 0 … 65535

Parameter Value

trainingSequenceCode 0 … 7

IDLE MODE OPERATION IDLE MODE OPERATION ID's and ID CodesID's and ID Codes

• mcc (Mobile Country Code) 0 … 999• mnc (Mobile Network Code) 0 … 99• lac (Location Area Code) 0 … 65535

Cell Global Identity MCC + MNC + LAC + CI

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IDLE MODE OPERATIONIDLE MODE OPERATIONBaseStation Identity Code (BSIC)BaseStation Identity Code (BSIC)

• BSIC is a combination of NCC and BCC

• Reported in Measurement Results to BSC

• Can be listed in Hex or Decimal

NCC (0...7) BCC (0...7)4 2 U 4 2 U32 16 8 4 2 U Range0 0 0 x x x 0 - 70 0 1 x x x 8 - 150 1 0 x x x 16 - 230 1 1 x x x 24 - 311 0 0 x x x 32 - 391 0 1 x x x 40 - 471 1 0 x x x 48 - 551 1 1 x x x 56 - 63

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IDLE MODE OPERATIONIDLE MODE OPERATIONBase Station Colour CodeBase Station Colour Code

MNC = Operator

MCC = Country e.g Finland

LAC 1 = Helsinki LAC 2

LAC 3 LAC 4

f1

f2

f3

f1

f1

bcc = 1

bcc = 2

bcc = 3

Neighbour list of f3:f1f2...

Location Area Code

BSC

BTS BTS BTS

1 2 n

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initialFrequency 1 ... 124 GSM 900 512 … 885 GSM 1800

512 … 810 GSM 1900

Parameter Value

bCCHAllocation-ID 1 ... 128 in GSM

bCCHAllocationList 1 ... 124 in GSM ( max. 32 freq. for all bands)

idleStateBCCHAllocation 0 (BCCH list is taken from the adjacent cell) 1 ... 128 (number of the BCCH list used)

measurementBCCHAllocation Dedicated ModeADJ (BCCH frequency list taken from adj. cell)IDLE (active MS uses the same list as MS

in IDLE mode)

IDLE MODE OPERATION IDLE MODE OPERATION FrequenciesFrequencies

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plmnpermitted 0 ... 7

Parameter Value

NOTE This parameter is confusing. It’s not used for network selection. It’s used AFTER a network has been selected so that only measurements from one PLMN are reported

IDLE MODE OPERATION IDLE MODE OPERATION PLMN SelectionPLMN Selection

• Two Modes

• Automatic

• Manual

• Three Types of Lists

• Preferred

• Found

• Forbidden

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IDLE MODE OPERATION IDLE MODE OPERATION Cell Selection in Idle Mode Cell Selection in Idle Mode

Two methods:a) Normal cell selection

b) Stored list cell selection (opt)

If no suitable cell found with method b) then a) is tried.

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IDLE MODE OPERATION IDLE MODE OPERATION Suitable cell to camp onSuitable cell to camp on

• Cell is in the selected PLMN• Cell is not barred• It is not in a forbidden location area for national roaming• C1 >0• If there is no normal priority cell then low priority cell

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IDLE MODE OPERATION IDLE MODE OPERATION Cell BarredCell Barred

Existing Layer• Barred, No

New Microcell Layer• Barred, Yes

•Call setup on macro, no SDCCH needed in micro (only BCCH)

GPS-satellite

Measurement SystemcellBarQualify Y cell bar can be overridden(C2) N cell bar can not be overridden

Example

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Averaging 3-5 s.Decision 5s.

IDLE MODE OPERATIONIDLE MODE OPERATION Cell Selection in Idle Mode- ImplementationCell Selection in Idle Mode- Implementation

• Radio Criteria

C1 = (A - Max(B,0))

• A = Received Level Average - p1

• B = p2 - Maximum RF Output Power of the Mobile Station

• p1 = rxLevelAccessMin Min. received level at the MS required for access to the system

• p2 = msTxPowerMaxCCH Max. Tx power level an MS may use when accessing the system

rxLevelAccessMin -110 ... -47

msTxPowerMaxCCH 5 … 43

Parameter Value

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IDLE MODE OPERATION IDLE MODE OPERATION Cell Selection in Idle Mode, GSM 1800Cell Selection in Idle Mode, GSM 1800

• The powerOffset parameter is used for class 3 GSM 1800 MSs (P = 36dBm).

• P2 = msTxPowerMaxCCCH + powerOffset

• When calculating C1

• When accessing the Network

powerOffset 0 = 0 dB1 = 2 dB2 = 4 dB3 = 6 dB

Parameter Value

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IDLE MODE OPERATION IDLE MODE OPERATION Cell Re-selection in Idle Mode Cell Re-selection in Idle Mode

Cell re-selection is needed if • Path Loss criterion C1 < 0 for cell camped on ,for more than 5 seconds.• There is DL signalling failure• The cell camped on has become barred.• There is a better cell in terms of C2 criterion• A random access attempt is still unsuccessful after " maxNumberRetransmission " repetitions.

MS will calculate the C1 and C2 for the serving cell, every 5 sMS will calculate the C1 and C2 for the neighbour cells, every 5 s

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BCCH

BCCH

fast moving mobile

slow moving mobile

time

microcell

macrocell

cell attractiveness

IDLE MODE OPERATION IDLE MODE OPERATION Cell Re-selection with C2 Cell Re-selection with C2

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cellReselectParamInd Y C2 reselection parameters are broadcast N C2 reselection parameters are not broadcast

cellReselectOffset 0 ... 126 (dB) 2 dB steppenaltyTime 20 ... 640 (s) 20 s steptemporaryOffset 0 ... 70 (dB) 10 dB step (the value is negative)

Parameter Value

C1 + cellReselectOffset - temporaryOffset*H(penaltyTime-T) <= penaltyTime < 640

C2 =C1 - cellReselectOffset ………………………………………….. <= penaltyTime = 640

1 when T < = penaltyTime H(x) =

0 when T > penaltyTime

IDLE MODE OPERATION IDLE MODE OPERATION Cell Re-selection with C2, continues Cell Re-selection with C2, continues

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timepenaltyTime

C1

cellReselectOffset

cellReselectOffset

C2

C2

temporaryOffset

dB

IDLE MODE OPERATION IDLE MODE OPERATION Cell Re-selection with C2, continues Cell Re-selection with C2, continues

C2 when penaltyTime = 640C2 when penaltyTime < 640

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IDLE MODE OPERATION IDLE MODE OPERATION Cell Re-selectionCell Re-selection

cellReselectHysteresis (0 … 14 dB) (mentioned in RR Management in IDLE mode Control).

A = 4 dB

B = 6 dB

C = 8 dB• A B C • 1 2

1

2

MS Moving

A B C

LA1 LA2

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IDLE MODE OPERATION IDLE MODE OPERATION Cell Re-selectionCell Re-selection

cellReselectHysteresis (0 … 14 dB)

cellReselectHysteresisThe nominal LA border

The real LA border

L1

L2

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• timerPeriodicUpdateMS 0.0 ... 25.5 (hours)• allowIMSIAttachDetach Yes/No

Parameter Value

IDLE MODE OPERATION IDLE MODE OPERATION Location UpdateLocation Update

• MS => MSC / VLR

• Mobile Station switched ON

• No 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 (MS -> MSC/VLR)