gsm nokia初陪参数理论3.1-bsspar idle mode operation

1、Idle Mode OperationBSS PAR S10.5Module 03Module ObjectivesAt the end of the module, the participant will be able to: List functions of the MS during idle modeExplain the parameters used for PLMN and cell selectionState the purpose of location updates and the associated parametersContents1. IDLE Mode

2、 tasks overview2. IDs and ID Codes, Frequencies3. PLMN selection4. Cell selection and cell reselection C1 Cell (Re)-Selection Criterion C2 Re-Selection Criterion5. Location Area Management Location Updates Timer for Periodic Location Updates6. IMSI Attach/DetachIdleMode OperationIdle Mode Operation

3、When the MS is switched ON? When there is no dedicated connection?When? To camp on the best suitable cellWhy? 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/SMSWhy to camp on a specif

4、ic cell?IdleMode Operation PLMN selection Cell selection & re-selection Location updatesIdle Mode TasksIDs and ID CodesLAI (locationAreaId) NCC (Network Colour Code)0 7 BCC (BTS Colour Code)0 7BSIC (bsIdentityCode) CI (cell-ID) 0 65535ParameterValue TSC (trainingSequenceCode) 0 7 MCC (Mobile Country

5、 Code)0 999 MNC (Mobile Network Code)0 99 LAC (Location Area Code)0 65535CGI (Cell Global Identity) MCC + MNC + LAC + CIIdleMode OperationBase Station Identity Code (BSIC) BSIC is a combination of NCC and BCC Reported in Measurement Results to BSC Can be listed in Hex or DecimalIdleMode Operation pl

6、mnpermitted 0 . 7Parameter ValueNOTE This parameter is confusing. Its not used for network selection. Its used AFTER a network has been selected so that measurements from only one PLMN are reportedPLMN SelectionTwo ModesAutomatic - utilises a list of PLMNs in priority order. Highest priority (availa

7、ble and allowable) PLMN is selected Manual - MS indicates to user which PLMNs are available Three Types of ListsPreferredFoundForbiddenIdleMode OperationBase Station Colour CodeMNC = OperatorMCC = Country e.g FinlandLAC 1 = HelsinkiLAC 2LAC 3LAC 4f1f2f3f1f1bcc = 1bcc = 2bcc = 3Neighbour list of f3:f

8、1f2.Location Area CodeBSCBTSBTSBTS12nIdleMode OperationFrequenciesParameterValuebCCHAllocation-ID 1 . 255bCCHAllocationList 1 . 124 in GSM (max. 32 freq. for all bands)idleStateBCCHAllocation 0 (BCCH list is taken from the adjacent cell) 1 . 255 (number of the BCCH list used)measurementBCCHAllocatio

9、n ADJ (BCCH frequency list taken from adj. cell) IDLE (active MS uses same list as MS in IDLE mode) initialFrequency 1.124 & 975.1023, 0; 512.885 GSM900;1800 (FREQ TRX)IdleMode OperationUse of Cell Barring for Test MeasurementsCell Selection in Idle ModeTwo methods for selecting a cell: Normal cell

10、selection (a) - MS has no prior knowledge of which RF channels are BCCH Stored list cell selection - optional (b) - MS uses list of BCCH carriers used by PLMN If no suitable cell is found using method (b) then (a) is tried.IdleMode OperationWhat constitutes a suitable cell: Cell is in the selected P

11、LMN Cell is not barred It is not in a forbidden location area for national roaming C1 0 (range -99.0.+99) If there is no normal priority cell then low priority cellAveraging 3-5 s.Decision 5s.Cell (Re-)Selection in Idle ModeUsing C1 CriterionRadio Criteria C1 = (A - Max(B,0)A = Received Level Averag

12、e - p1B = p2 - Maximum RF Output Power of the Mobile Stationp1 = rxLevelAccessMin (Min. received level at the MS required for access to the system) (RXP BTS -110.-105 -47 dBm)p2 = msTxPowerMaxCCH(Max. Tx power level an MS may use when accessing the system) (TXP BTS GSM900 5.33.43/2 33; GSM1800 0.30/

13、2 30 dBm)rxLevelAccessMin -110 . -47 dBm RXP (BTS)msTxPowerMaxCCH 0 30 dBm GSM1800 (5 43 dBm GSM900) TXP (BTS)Parameter ValueIdleMode OperationCell Re-selection (C1)IdleMode OperationA = 4 dBB = 6 dBC = 8 dB ABC 1212MS MovingABCLA1LA2 cellReselectHysteresis 0 14 dB (HYS) (BTS) 2dB steps MML def 4dBP

14、arameter Value Cell Re-selection in Idle ModeUsing C2 Re-Selection Criterion (PH 2 MS)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 e barred. There is a better cell in terms of C2 criterion A

15、 random access attempt is still unsuccessful after maxNumberRetransmission repetitions. MS will calculate the C1 and C2 for the serving cell, every 5 s MS will calculate the C1 and C2 for the six best neighbour cells, every 5 sIdleMode OperationBCCHBCCHfast moving mobileslow moving mobileCell Re-sel

16、ection with C2 (1/3)IdleMode OperationC2PTC2C1=C2timemicrocellmacrocellC1,C2 Cell Re-selection with C2 (2/3)Equation & ParametersC1 + cellReselectOffset - temporaryOffset*H(penaltyTime-T) = penaltyTime 640 C2 =C1 - cellReselectOffset . = penaltyTime = 6401 when T penaltyTime cellReselectParamInd Y /

17、 N cellReselectOffset 0 . 126 dBpenaltyTime 20 . 640 sectemporaryOffset 0 . 70 dBParameter ValueIdleMode OperationIdleMode Operation Cell Re-selection with C2 (3/3)ExampleC1 A=30C1 B=25C1 C=5C1 D=50C2 = C1 + cellReselectOffset - temporaryOffset*H(penaltyTime-T)C2 A=30 + 0 serving cell H(x) = 0C2 B=2

18、5 +20-30 * H(20-T) C2 C=5 + 0 - 0 * H(0-T)C2 D=50+0-30*H(40-T)Microcell 900Macrocell 1800Macrocell 900cellReselectOffset 0 20 0penaltyTime 0 20 40temporaryOffset 0 30 30GSM900GSM1800GSM900microTime T: between 0 and 19 secondsC2 A=30C2 B=15 C2 C=5C2 D=20Time T: between 20 and 39 secondsC2 A=30C2 B=45

19、C2 C=5C2 D=20Time T: greater than 40 secondsC2 A=30C2 B=45 C2 C=5C2 D=50Location UpdatesLocation Update ProcedureTrade-off between Location Update and Paging TraffictimerPeriodicUpdateMS 0.0 . 25.5 hrs (PER)(BTS) see note in dictionary!allowIMSIAttachDetach Yes/No (ATT)(BTS)Parameter ValueLocation UpdatesIdleMode OperationMS = MSC / VLRMobile Station switched ONIMSI Attach / DetachSame Location Area = No Location UpdateDifferent Location Area = Location UpdateChange of the Location AreaLocation Area under the same MSC / VLRLocation