2003219 S10.5 ETSI documentation set RF Power Control and Handover Algorithm dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential (155) RF Power Control and Handover Algorithm The information in this document is subject to change without notice and describes only the product defined in the introduction of this documentation This document is intended for the use of Nokia's customers only for the purposes of the agreement under which the document is submitted, and no part of it may be reproduced or transmitted in any form or means without the prior written permission of Nokia The document has been prepared to be used by professional and properly trained personnel, and the customer assumes full responsibility when using it Nokia welcomes customer comments as part of the process of continuous development and improvement of the documentation The information or statements given in this document concerning the suitability, capacity, or performance of the mentioned hardware or software products cannot be considered binding but shall be defined in the agreement made between Nokia and the customer However, Nokia has made all reasonable efforts to ensure that the instructions contained in the document are adequate and free of material errors and omissions Nokia will, if necessary, explain issues which may not be covered by the document Nokia's liability for any errors in the document is limited to the documentary correction of errors NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENT OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL (INCLUDING MONETARY LOSSES), that might arise from the use of this document or the information in it This document and the product it describes are considered protected by copyright according to the applicable laws NOKIA logo is a registered trademark of Nokia Corporation Other product names mentioned in this document may be trademarks of their respective companies, and they are mentioned for identification purposes only Copyright © Nokia Corporation 2002 All rights reserved (155) # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en Contents Contents Contents List of tables List of figures Summary of changes Overview to RF Power Control and Handover Algorithm 11 RF power control and handovers in BSC 15 RF Power Control and Handover Algorithm: radio link measurement processing in BTS and BSC 19 RF Power Control and Handover Algorithm: averaging of MSBS distance 27 Bookkeeping and averaging of the RXLEV of the adjacent cell 29 RF Power Control and Handover Algorithm: MS speed averaging 33 RF Power Control and Handover Algorithm: variable averaging window size 37 RF Power Control and Handover Algorithm: averaging of rapidly changing signal level 39 RF Power Control and Handover Algorithm: FER 41 10 10.1 RF Power Control 47 RF Power Control and Handover Algorithm: threshold comparison and command 47 RF Power Control and Handover Algorithm: MS power increase due to signal level 49 RF Power Control and Handover Algorithm: MS power decrease due to signal level 51 RF Power Control and Handover Algorithm: MS power increase due to signal quality 52 RF Power Control and Handover Algorithm: MS power decrease due to signal quality 56 RF Power Control and Handover Algorithm: BTS power increase due to signal level 61 RF Power Control and Handover Algorithm: BTS power decrease due to signal level 63 RF Power Control and Handover Algorithm: BTS power increase due to signal quality 65 RF Power Control and Handover Algorithm: BTS power decrease due to 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential (155) RF Power Control and Handover Algorithm signal quality 69 11 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 11.10 11.11 11.12 11.13 11.13.1 11.14 11.15 11.16 11.17 11.18 12 (155) RF Power Control and Handover Algorithm: BSC handovers 75 RF Power Control and Handover Algorithm: handover due to uplink/ downlink interference 76 RF Power Control and Handover Algorithm: handover due to uplink/ downlink quality 79 RF Power Control and Handover Algorithm: handover due to uplink/ downlink level 82 RF Power Control and Handover Algorithm: target cell evaluation according to radio criteria 84 RF Power Control and Handover Algorithm: handover due to MS-BS distance 86 RF Power Control and Handover Algorithm: handover due to rapid field drop 91 RF Power Control and Handover Algorithm: handover due to fast/slowmoving MS 93 RF Power Control and Handover Algorithm: power budget handover 100 RF Power Control and Handover Algorithm: umbrella handover 103 RF Power Control and Handover Algorithm: handover due to turn-aroundcorner MS 108 RF Power Control and Handover Algorithm: traffic reason handover 112 RF Power Control and Handover Algorithm: forced handover 113 RF Power Control and Handover Algorithm: BSC Initiated Traffic Reason Handover 114 BSC Initiated Traffic Reason Handover with GSM-WCDMA Inter-System Handover 117 RF Power Control and Handover Algorithm: Directed Retry Procedure 117 RF Power Control and Handover Algorithm: order of preference of target cells 120 RF Power Control and Handover Algorithm: interval between handovers and handover attempts 121 RF Power Control and Handover Algorithm: channel allocation criteria based on the minimum acceptable C/N ratio 124 RF Power Control and Handover Algorithm: optimisation of the MS power level in handover and in call set-up 128 RF Power Control and Handover Algorithm parameters 133 # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en List of tables List of tables dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential (155) RF Power Control and Handover Algorithm List of figures Figure Implementation of Power Control and Handover Figure Example of correlation table of one codec, hopping or non-hopping Figure Example of calculated FEP values of one codec derived from the correlation table, hopping or non-hopping 42 Figure Correction values for updating the correlation table Figure Inversed correction values for using the correlation table Figure MS power increase due to signal level Figure MS power decrease due to signal level Figure MS power increase due to signal quality Figure MS power decrease due to signal quality 42 43 45 49 51 53 57 Figure 10 BTS power increase due to signal level 61 Figure 11 BTS power decrease due to signal level 64 Figure 12 BTS power increase due to signal quality 66 Figure 13 BTS power decrease due to signal quality 70 Figure 14 Handover due to uplink/downlink interference Figure 15 Handover due to uplink/downlink quality 77 80 Figure 16 Handover due the uplink/downlink level 83 Figure 17 Handover due to MS-BS distance Figure 18 Handover due to rapid field drop 87 92 Figure 19 Handover due to fast/slow-moving MS Figure 20 Power budget handover Figure 21 Umbrella handover 95 101 104 Figure 22 Handover due to turn-around-corner MS Figure 23 Traffic reason handover 109 112 Figure 24 BSC Initiated Traffic Reason Handover Figure 25 Directed Retry Procedure (155) 11 # Nokia Corporation Nokia Proprietary and Confidential 115 118 dn9814129 Issue 12-0 en Summary of changes Summary of changes Summary of changes Changes between document issues are cumulative Therefore, the latest document issue contains all changes made to previous issues Changes made between issues 11 and 10 The document has been revised throughout to comply with the latest documentation standards Chapter Processing of radio link measurements Section FER added Chapter RF Power control, section PC threshold comparison and PC command The mention of maximum MS transmission power parameters updated and GSM 850 information added Chapter RF Power control, section MS power increase due to signal quality Note of AMR PC Rx Quality thresholds added in subsection Threshold comparison Chapter RF Power control, section MS power decrease due to signal quality Note of AMR PC Rx Quality thresholds added in subsection Threshold comparison Chapter RF Power control, section BTS power increase due to signal quality Note of AMR PC Rx Quality thresholds added in subsection Threshold comparison Chapter RF Power control, section BTS power decrease due to signal quality Note of AMR PC Rx Quality thresholds added in subsection Threshold comparison Chapter Handover and Chapter Parameters, section Figures Equations of Pa, PBGT(n), MAX_INTF_LEV, MS_TXPWR_OPT, pwr(n) and their explanations updated Also GSM 850 information added dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential (155) RF Power Control and Handover Algorithm Chapter Handover, section Handover due to uplink/downlink interference In subsection Threshold comparison, uplink quality corrected to downlink quality in the mention of handover cause downlink interference Chapter Handover, section Handover due to uplink/downlink quality Note of new AMR HO Rx Quality thresholds added in subsection Threshold comparison Chapter Handover, section Handover due to fast/slow-moving MS In figure Handover due to fast/slow-moving MS the equation FastMovingThreshold(n)=0 corrected to FastMovingThreshold(n)>0 Chapter Handover, section BSC initiated traffic reason handover Note of parameter TrhoGuardTime applying added Chapter Handover, section Optimisation of the MS power level in handover and in call set-up The mention of maximum MS transmission power parameters updated and GSM 850 information added Chapter Parameters Parameter AmhTrafficControlMCN added GSM 850 information added to parameters gsmMacrocellThreshold , gsmMicrocellThreshold and MsTxPwrMin New parameters AmrHandoverFr.ThresholdDLRXQual , AmrHandoverFr ThresholdULRXQual , AmrHandoverHr.ThresholdDLRXQual , AmrHandoverHr.ThresholdULRXQual , AmrPowerControlFr PcLowerThresholdDLRxQual , AmrPowerControlFr PcLowerThresholdULRxQual , AmrPowerControlFr PcUpperThresholdDLRxQual , AmrPowerControlFr PcUpperThresholdULRxQual , AmrPowerControlHr PcLowerThresholdDLRxQual , AmrPowerControlHr PcLowerThresholdULRxQual , AmrPowerControlHr PcUpperThresholdDLRxQual and AmrPowerControlHr PcUpperThresholdULRxQual added Parameter MsTxPwrMax changed to parameters MsTxPwrMaxGSM (BTS) and MsTxPwrMaxGSM1x00 (BTS) Parameter MsTxPwrMaxCell changed to parameters MsTxPwrMaxGSM (ADJ) and MsTxPwrMaxGSM1x00 (ADJ) Also GSM 850 information added (155) # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en Summary of changes Chapter Parameters, section Figures In figure Handover due to fast/slow-moving MS the equation FastMovingThreshold(n)=0 corrected to FastMovingThreshold(n)>0 Changes made between issues 10 and Chapter RF power control, section BTS power decrease due to signal level Description of variable downlink power step size added Figure BTS power decrease due to signal level and its caption updated Chapter RF power control, section BTS power decrease due to signal level In section Threshold comparison the sentence The BTS power is always decreased by fixed step removed due to the addition of the description of variable downlink power step size Chapter RF power control, section BTS power decrease due to signal quality Description of variable downlink power step size added to figure BTS power decrease due to signal quality Chapter RF power control, section BTS power decrease due to signal quality In section Threshold comparison the sentence The BTS power is always decreased by fixed step removed Chapter RF power control, section BTS power decrese due to signal quality Description of variable downlink power step size added to its own subsection Power change step size Chapter Handover, section Handover due to fast/slow moving MS Description of the definition of the maximum power capability of the MS corrected in subsection Target cell evaluation Chapter Handover, section Umbrella handover Figure Umbrella handover modified Chapter Handover, section BSC initiated traffic reason handover Figure BSC initiated traffic reason handover updated dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential (155) RF Power Control and Handover Algorithm Description of the use of parameter Cause Field in Handover Request Supported corrected Chapter Parameters New parameters OptimumRxLevDL and VariableDLStepUse added Changes made between issues and Chapter Handover, section BSC initiated traffic reason handover A new section Chapter Parameters New parameters: AmhMaxLoadOfTgtCell, AmhTrhoPbgtMargin, AmhUpperLoadThreshold, TrhoGuardTime, UpperLimitCellLoadHSCSD 10 (155) # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters DIS Enhanced rapid field drop detection procedure is disabled UL Enhanced rapid field drop detection procedure is based on uplink signal level measurements DL Enhanced rapid field drop detection procedure is based on downlink signal level measurements UDL Enhanced rapid field drop detection procedure is based on both downlink and uplink signal level measurements (uplink and downlink measurement results are monitored independently, simultaneous field drop is not required) 44 ErfdOver (ERD/HOC) determines the maximum time period starting from the detection of the rapid field drop during which the averaging of signal level measurements is controlled by the averaging parameters ModifiedAveWinNcell and ModifiedNOZ The range varies from zero to 64 seconds 45 FastMovingThreshold (FMT/ADJ) is used for comparing the MS speed in relation to the cell size for triggering the handover from the serving cell to a low layer cell FastMovingThreshold indicates the time that an MS has to remain within the coverage area of the adjacent cell before a handover is possible The range is from to 255, where a step size of correlates with one SACCH multiframe The use of the parameter is disabled when the value is zero This parameter can be defined for each of the 32 adjacent cells Note When the value of the parameter FastMovingThreshold is zero (not used), the BSC does not evaluate the MS speed in relation to the size of the adjacent cell in question even though the adjacent cell were a low layer cell 46 47 dn9814129 Issue 12-0 en GenHandoverReqMessageNoOfPrefCells (NPC/BSC) indicates the number of handover candidates in the MSC-controlled handover The range is from to 16 The parameter is set for the BSC gsmMacrocellThreshold (GMAC/BSC) indicates the size of a GSM macrocell by means of the maximum transmission power of the MS The range in GSM 900 and in GSM 800 is from to 43 dBm The parameter is set for the BSC # Nokia Corporation Nokia Proprietary and Confidential 141 (155) RF Power Control and Handover Algorithm 48 gsmMicrocellThreshold (GMIC/BSC) indicates the size of a GSM microcell by means of the maximum transmission power of the MS The range in GSM 900 and in GSM 800 is from to 43 dBm The parameter is set for the BSC 49 HoAveragingLevDL (LDWS,LDW /HOC) is used for calculating averaged values from downlink signal strength measurements for HO threshold comparison: 50 HoAveragingLevUL (LUWS,LUW /HOC) is used for calculating averaged values from uplink signal strength measurements for HO threshold comparison: 51 142 (155) Window size (QDWS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (QDW) is the weighting factor if DTX was not used The range is from to HoAveragingQualUL (QUWS,QUW /HOC) is used for calculating averaged values from uplink signal quality measurements for HO threshold comparison: 53 Window size (LUWS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (LUW) is the weighting factor if DTX was not used The range is from to HoAveragingQualDL (QDWS,QDW /HOC) is used for calculating averaged values from downlink signal quality measurements for HO threshold comparison: 52 Window size (LDWS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (LDW) is the weighting factor if DTX was not used The range is from to Window size (QUWS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (QUW) is the weighting factor if DTX was not used The range is from to HoLevelUmbrella (AUCL/ADJ) is the level which the signal level in the adjacent cell must exceed in order for the umbrella HO to the adjacent cell to become possible The range is from -110 dBm to -47 dBm The parameter can be defined for each of the 32 adjacent cells # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters 54 55 HoMarginLev (LMRG/ADJ) is used as a threshold in the handover caused by signal level The range is from -24 dB to 24 dB and the step size is dB The parameter can be defined for each of the 32 adjacent cells 56 HoMargingPBGT (PMRG/ADJ) is used as a threshold to prevent repetitive handovers between cells It may also be used as a threshold in the power budget handover The range is from -24 dB to 63 dB and the step size is dB The parameter can be defined for each of the 32 adjacent cells 57 HoMarginQual (QMRG/ADJ) is used as a threshold in the handover caused by signal quality The range is from -24 dB to 24 dB and the step size is dB The parameter can be defined for each of the 32 adjacent cells 58 HoPeriodPBGT (HPP/HOC) is the interval between the power budget threshold comparisons The range is from to 63 SACCH multiframe periods 59 HoPeriodUmbrella (HPU/HOC) is the interval between the umbrella HO threshold comparisons The range is from to 63 SACCH multiframe periods 60 HoPreferenceOrderInterfDL (HDL/BSC) indicates which handover, intra-cell or inter-cell, is preferable when the cause of the handover is Downlink interference An inter-cell handover takes priority over an intra-cell handover when the value is 'inter-cell' An intra-cell handover is preferable when the value is 'intra-cell' The parameter is set for the BSC 61 HoPreferenceOrderInterfUL (HUL/BSC) indicates which handover, intra-cell or inter-cell, is preferable when the cause of the handover is Uplink interference An inter-cell handover takes priority over an intra-cell handover when the value is 'inter-cell' An intra-cell handover is preferable when the value is 'intra-cell' The parameter is set for the BSC 62 HoPriorityLevel (PRI/ADJ) defines the priority level for an adjacent cell Priority level is used in target cell evaluation The range varies from zero to Zero is the lowest and the highest priority level The parameter can be defined for each of the 32 adjacent cells 63 dn9814129 Issue 12-0 en HoLoadFactor (OF/ADJ) indicates how much the priority of the adjacent cell will be decreased if the cell is overloaded This parameter is used only for adjacent cells which belong to the same BSS as the serving cell The range varies from zero to The parameter can be defined for each of the 32 adjacent cells HoTargetArea (HOTA/ADJ) indicates whether the adjacent cell is an extended range cell or a normal cell, and in case of an extended range cell, it determines the TRX (extended range or normal range) of the adjacent cell from where the BSC allocates a TCH for an intra-BSC handover attempt (see Extended Cell Range ) The parameter can be defined for each of the 32 adjacent cells The alternative values are the following: # Nokia Corporation Nokia Proprietary and Confidential 143 (155) RF Power Control and Handover Algorithm Extended range cell and the site type is Nokia Talkfamily; a TCH is allocated from a normal TRX Extended range cell and the site type is Nokia Talkfamily; a TCH is allocated from an extended range TRX 64 Normal cell or the site type is Nokia 2nd generation Extended range cell and the site type is Nokia Talkfamily; a TCH is allocated from a TRX whose type (extended range or normal range) is the same as the type of the serving TRX HoThresholdsInterferenceDL (IDR,IDN,IDP /HOC) is used for comparing the averaged values of downlink signal strength measurements for triggering the HO 65 HoThresholdsInterferenceUL (IUR,IUN,IUP /HOC) is used for comparing the averaged values of uplink signal strength measurements for triggering the HO 66 144 (155) RxLev (IDR) is the threshold level for handover whose cause is interference The range is from -110 dBm to -47 dBm Nx (IDN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (IDP) is the number of averages out of total averages that have to be greater than or equal to the threshold before a handover (whose cause is interference) is possible The range varies from to 32 RxLev (IUR) is the threshold level for handover whose cause is interference The range is from -110 dBm to -47 dBm Nx (IUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (IUP) is the number of averages out of total averages that have to be greater than or equal to the threshold before a handover (whose cause is interference) is possible The range varies from to 32 HoThresholdsLevDL (LDR,LDN,LDP /HOC) is used for comparing the averaged values of downlink signal strength measurements for triggering the HO # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters 67 HoThresholdsLevUL (LUR,LUN,LUP /HOC) is used for comparing the averaged values of uplink signal strength measurements for triggering the HO 68 dn9814129 Issue 12-0 en RxQual (QDR) is the threshold level for handover The range is 12.8% (bit error rate) Nx (QDN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (QDP) is the number of averages out of total averages that have to be greater (of worse quality) than or equal to the threshold before a handover is possible The range varies from to 32 HoThresholdsQualUL (QUR,QUN,QUP /HOC) is used for comparing the averaged values of uplink signal quality measurements for triggering the HO 70 RxLev (LUR) is the threshold level for handover The range is from -110 dBm to -47 dBm Nx (LUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (LUP) is the number of averages out of total averages that have to be lower than or equal to the threshold before a handover is possible The range varies from to 32 HoThresholdsQualDL (QDR,QDN,QDP /HOC) is used for comparing the averaged values of downlink signal quality measurements for triggering the HO 69 RxLev (LDR) is the threshold level for handover The range is from -110 dBm to -47 dBm Nx (LDN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (LDP) is the number of averages out of total averages that have to be lower than or equal to the threshold before a handover is possible The range varies from to 32 RxQual (QUR) is the threshold level for handover The range is 12.8% (bit error rate) Nx (QUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (QUP) is the number of averages out of total averages that have to be greater (of worse quality) than or equal to the threshold before a handover is possible The range varies from to 32 HoThresholdsRapidLevUL (RPD,CNT /HOC) is used for comparing the raw results of uplink signal strength measurements for triggering the HO # Nokia Corporation Nokia Proprietary and Confidential 145 (155) RF Power Control and Handover Algorithm 71 RxLev (RPD) is the threshold level for handover The range is from -110 dBm to -47 dBm Px (CNT) is the number of measurement results (raw measurement results, not averaged values) that have to be lower than or equal to the threshold before a handover is possible The range varies from to 32 A handover, whose cause is "Rapid field drop", is disabled when the value is InterferenceAveragingProcess (AP,BO1-BO4 /BTS) is used for calculating averaged values from the interference level in the active/ unallocated time slots for the traffic channel allocation procedure (see Radio Channel Allocation /14/): AveragingPeriod (AP) is the number of SACCH multiframes from which the averaging of the interference level in the active/ unallocated time slots is performed The range is from to 32 Boundary1 - Boundary4 (BO1-BO4) are the limits of five interference bands for the active/unallocated time slots The range is from -110 dBm to -47 dBm 72 73 MaxTimeLimitDR (MADR/BTS) determines the maximum time period starting from the assignment request during which the target cell evaluation for the directed retry procedure is allowed The range of the parameter from to 15 seconds 74 MinIntBetweenHoReq (MIH/HOC) is the minimum interval between the handovers related to the same connection The range is from zero to 31 seconds and the step size is one second 75 MinIntBetweenUnsuccHoAttempt (MIU/HOC) is the minimum interval between an unsuccessful handover attempt and the following handover attempt related to the same connection The range is from zero to 31 seconds and the step size is one second 76 146 (155) LowerSpeedLimit (LSL/HOC) is used for comparing the averaged values of MS speed indications for triggering the handover from a serving layer to a low layer cell The speed of an MS has to be lower than or equal to the threshold LowerSpeedLimit in order for the HO to be allowed The range is from to 255 The step size is 1, which correlates with speed of km/h The use of the comparison is disabled when the value is zero MinTimeLimitDR (MIDR/BTS) determines the period starting from the assignment request during which the target cell evaluation for the directed retry procedure is not allowed The BSC starts the target cell evaluation procedure after this time supervision has expired The range is from zero to 14 seconds # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters 77 ModifiedAveWinNcell (ERAW/HOC) determines the averaging window size which is used after the detection of the rapid field drop for calculating averaged values from the signal level measurements for HO threshold comparison and decision The range is from to 32 SACCH multiframe periods 78 ModifiedNOZ (ERZ/HOC) indicates the maximum number of zero results that can be omitted when the measurement results of the adjacent cells are averaged after the detection of the rapid field drop The range of the parameter is from to 31 zero results 79 MSDistanceAveragingParam (MSWS/HOC) is used for calculating averaged values from MS-BS distance (timing advance) for HO threshold comparison For window size the range is from to 32 SACCH multiframe periods; 80 MsDistanceBehaviour (DISB/BSC) indicates the executions after the MS-BS distance (timing advance) has reached the threshold MsDistanceHoThresholdParam The alternative functions are the following: call release immediately, to 60 seconds time to try imperative handover (release if the handover did not succeed), and merely imperative handover attempts The parameter is set for the BSC Note The parameter has no effect on either a handover from an extended range cell to an inner/outer cell (see Extended Cel l) or a handover between normal and extended coverage areas within an extended range cell (see Extended Cell Range ) 81 MsDistanceHoThresholdExtCellMax (MAX/HOC) is used for comparing the averaged values of the MS-BS distance (timing advance) for triggering the HO either from an extended range cell to an outer (extended range) cell when the site type is Nokia 2nd generation (see Extended Cell ), or from a normal area to an extended area within an extended range cell when the site type is Nokia Talk-family (see Extended Cell Range ) The range is from to 63 The step size is 1, which correlates with timing advance of bit This also correlates with the distance of 550 meters Note The threshold does not include the usual Px and Nx parts but it uses the Px and Nx parts of the threshold MsDistanceHoThresholdParam dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential 147 (155) RF Power Control and Handover Algorithm 82 MsDistanceHoThresholdExtCellMin (MIN/HOC) is used for comparing the averaged values of the MS-BS distance (timing advance) for triggering the HO either from an extended range cell to an inner (adjacent) cell when the site type is Nokia 2nd generation (see Extended Cell ), or from an extended area to a normal area within an extended range cell when the site type is Nokia Talk-family (see Extended Cell Range ) The range is from to 63 The step size is 1, which correlates with timing advance of bit This also correlates with the distance of 550 meters Note The threshold does not include the usual Px and Nx parts but it uses the Px and Nx parts of the threshold MsDistanceHoThresholdParam 83 MsDistanceHoThresholdParam (MSR,MSN,MSP /HOC) is used for comparing the averaged values of the MS-BS distance (timing advance) for triggering the HO (or call release) 84 MSRangeMax (MSR) is the maximum timing advance between the BTS and the MS The range is from to 63 The step size is 1, which correlates with timing advance of bit This also correlates with the distance of 550 meters Nx (MSN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (MSP) is the number of averages out of total averages that have to be greater than or equal to the maximum timing advance before a handover or call release (whose cause is distance) is possible The range varies from to 32 MsPwrOptLevel (POPT/ADJ) indicates the optimum uplink RF signal level after a handover on a channel in the adjacent cell The range is from 110 dBm to -47 dBm The optimisation of the MS power level in handover is disabled when the value is 'no optimisation' The parameter can be defined for each of the 32 adjacent cells Note When the BSC calculates the optimised RF power level of the MS, it presumes that the uplink signal level is equal to the downlink signal level, measured by the MS, within the coverage area of the adjacent cell 148 (155) # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters If the downlink signal is, for example, dB stronger than the real uplink signal, the value for the parameterMsPwrOptLevel should be selected dB higher than the desirable uplink signal level Correspondingly, if the downlink signal is weaker than the real uplink signal, the value of the parameter MsPwrOptLevel should be lower than the desirable uplink signal level 85 MsSpeedAveraging (MSA/HOC) is used for calculating averaged values from MS speed indications for HO threshold comparison The range is from to 32 SACCH multiframe periods 86 MsSpeedDetectionState (SDS/HOC) indicates whether the information on the speed of the mobile station is used to control traffic between separate layers of the multi-layered cellular network or to scale the values of the averaging parameters The alternative values are the following: MS speed information is used to control traffic between separate layers of the multi-layered cellular network by means of the handover procedure - 100 MS speed information is used to scale the values of the averaging parameters In this case the parameter indicates how much the values of the averaging parameters are decreased if the mobile station is considered as a fast-moving MS (AvePrm * SDS / 100) The range is from 1% to 100% 87 88 MsSpeedThresholdPx (STP/HOC) is used for comparing the averaged values of MS speed indications for triggering the handover both from a serving layer to a low layer cell and from a serving layer to an upper layer cell MsSpeedThresholdPx is the number of averages out of total averages that have to be lower/greater than or equal to the threshold before a handover is possible The range varies from to 32 89 dn9814129 Issue 12-0 en MsSpeedThresholdNx (STN/HOC) is used for comparing the averaged values of MS speed indications for triggering the handover both from a serving layer to a low layer cell and from a serving layer to an upper layer cell MsSpeedThresholdNx is the total number of averages to be taken into account before decision is possible The range varies from to 32 MsTxPwrMaxGSM (PMAX1/BTS) is the maximum transmission power that an MS may use in the GSM 900 and GSM 800 serving cell The range is from to 43 dBm # Nokia Corporation Nokia Proprietary and Confidential 149 (155) RF Power Control and Handover Algorithm 90 MsTxPwrMaxGSM1x00 (PMAX2/BTS) is the maximum transmission power that an MS may use in the GSM 1800 and GSM 1900 serving cell The range in GSM 1800 is from to 36 dBm and in GSM 1900 from to 33 dBm 91 MsTxPwrMaxGSM (PMAX1/ADJ) is the maximum RF power level that an MS is permitted to use on a traffic channel in the GSM 900 and GSM 800 adjacent cell The range is from to 43 dBm The parameter can be defined for each of the 32 adjacent cells 92 MsTxPwrMaxGSM1x00 (PMAX2/ADJ) is the maximum RF power level that an MS is permitted to use on a traffic channel in the GSM 1800 and GSM 1900 adjacent cell The range in GSM 1800 is from to 36 dBm and in GSM 1900 from to 33 dBm The parameter can be defined for each of the 32 adjacent cells 93 MsTxPwrMin (PMIN/BTS) is the minimum transmission power that an MS may use in the serving cell The range in GSM 900 and in GSM 800 is from to 43 dBm, in GSM 1800 from to 36 dBm and in GSM 1900 from to 33 dBm 94 NumberOfZeroResults (NOZ/HOC) indicates the number of zero results which can be omitted when the measurement results of the adjacent cells are being averaged The range is from to 95 OptimumRxLevDL (LEVD/TRX) indicates the optimum downlink RF signal level which both ensures adequate speech/data quality and does not cause downlink interference The parameter is used by the power control of the BTS The range is from -109 dBm to -47 dBm, the use of the parameter is disabled when the value is 'not used' 96 OptimumRxLevUL (LEV/TRX) indicates the optimum uplink RF signal level which both ensures adequate speech/data quality and does not cause uplink interference The parameter is used by the power control of the MS The range is from -109 dBm to -47 dBm, the use of the parameter is disabled when the value is 'not used' 97 PcAveragingLevDL (LDS,LDW /POC) is used for calculating averaged values from downlink signal strength measurements for PC threshold comparison: 98 150 (155) Window size (LDS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (LDW) is the weighting factor if DTX was not used The range is from to PcAveragingLevUL (LUS,LUW /POC) is used for calculating averaged values from uplink signal strength measurements for PC threshold comparison: # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters 99 Window size (LUS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (LUW) is the weighting factor if DTX was not used The range is from to PcAveragingQualDL (QDS,QDW /POC) is used for calculating averaged values from downlink signal quality measurements for PC threshold comparison: Window size (QDS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (QDW) is the weighting factor if DTX was not used The range is from to 100 PcAveragingQualUL (QUS,QUW /POC) is used for calculating averaged values from uplink signal quality measurements for PC threshold comparison: Window size (QUS) is the size of the averaging window The range is from to 32 SACCH multiframe periods Weighting (QUW) is the weighting factor if DTX was not used The range is from to 101 PcLowerThresholdsLevDL (LDR,LDN,LDP /POC) is used for comparing the averaged values of downlink signal strength measurements for triggering the power control RxLev (LDR) is the threshold level for the BTS power increase Its range is from -110 dBm to -47 dBm Nx (LDN) is the total number of averages to be taken into account before decision is possible The range is from to 32 Px (LDP) is the number of averages out of total averages that have to be lower than or equal to the threshold before power increase is possible The range is from to 32 102 PcLowerThresholdsLevUL (LUR,LUN,LUP /POC) is used for comparing the averaged values of uplink signal strength measurements for triggering the power control dn9814129 Issue 12-0 en RxLev (LUR) is the threshold level for the MS power increase The range is from -110 dBm to -47 dBm Nx (LUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (LUP) is the number of averages out of total averages that have to be lower than or equal to the threshold, before power increase is possible The range varies from to 32 # Nokia Corporation Nokia Proprietary and Confidential 151 (155) RF Power Control and Handover Algorithm 103 PcLowerThresholdsQual144 (LQR,LQN,LQP /POC) is used for comparing the averaged values of uplink and downlink signal quality measurements for triggering the power control for 14.4 kbit/s data RxQual (LQR) is the threshold level for the MS/BTS power increase The range is 12.8% (bit error rate) Nx (LQN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (LQP) is the number of averages out of total averages that have to be greater (=of worse quality) than or equal to the threshold, before power increase is possible The range varies from to 32 104 PcLowerThresholdsQualDL (LDR,LDN,LDP /POC) is used for comparing the averaged values of downlink signal quality measurements for triggering the power control RxQual (LDR) is the threshold level for the BTS power increase The range is 12.8% (bit error rate) Nx (LDN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (LDP) is the number of averages out of total averages that have to be greater (=of worse quality) than or equal to the threshold, before power increase is possible The range varies from to 32 105 PcLowerThresholdsQualUL (LUR,LUN,LUP /POC) is used for comparing the averaged values of uplink signal quality measurements for triggering the power control RxQual (LUR) is the threshold level for the MS power increase The range is 12.8% (bit error rate) Nx (LUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (LUP) is the number of averages out of total averages that have to be greater (of worse quality) than or equal to the threshold before power increase is possible The range varies from to 32 106 PcUpperThresholdsLevDL (UDR,UDN,UDP /POC) is used for comparing the averaged values of downlink signal strength measurements for triggering the power control 152 (155) RxLev (UDR) is the threshold level for the BTS power decrease The range is from -110 dBm to -47 dBm Nx (UDN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (UDP) is the number of averages out of total averages that have to be greater than or equal to the threshold before power decrease is possible The range varies from to 32 # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters 107 PcUpperThresholdsLevUL (UUR,UUN,UUP /POC) is used for comparing the averaged values of uplink signal strength measurements for triggering the power control RxLev (UUR) is the threshold level for the MS power decrease The range is from -110 dBm to -47 dBm Nx (UUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (UUP) is the number of averages out of total averages that have to be greater than or equal to the threshold before power decrease is possible The range varies from to 32 108 PcUpperThresholdsQualDL (UDR,UDN,UDP /POC) is used for comparing the averaged values of downlink signal quality measurements for triggering the power control RxQual (UDR) is the threshold level for the BTS power decrease The range is 12.8% (bit error rate) Nx (UDN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (UDP) is the number of averages out of total averages that have to be lower (=of better quality) than or equal to the threshold, before power decrease is possible The range varies from to 32 109 PcUpperThresholdsQualUL (UUR,UUN,UUP /POC) is used for comparing the averaged values of uplink signal quality measurements for triggering the power control RxQual (UUR) is the threshold level for the MS power decrease The range is 12.8% (bit error rate) Nx (UUN) is the total number of averages to be taken into account before decision is possible The range varies from to 32 Px (UUP) is the number of averages out of total averages that have to be lower (of better quality) than or equal to the threshold before power decrease is possible The range varies from to 32 110 PowerControlInterval (INT/POC) is the minimum interval between the changes in the RF power level The range is from zero to 31 seconds and the step size one second 111 PowerCtrlEnabled (PENA/POC) indicates whether BTS power control is enabled The power control is enabled when the value is 'yes' 112 PowerDecrQualFactor (PDF/POC) indicates whether the MS power decrease due to signal quality by using the variable power change step size is enabled in such situations where the uplink signal level is lower than the optimum uplink RF signal level and the averaged signal quality equals the quality threshold The power decrease is enabled when the value is and it is disabled when the value is dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential 153 (155) RF Power Control and Handover Algorithm Note The parameter also has an effect on the size of the power decrease step 113 PowIncrStepSize (INC/POC) defines the step size for increasing the MS/BTS transmission power The step size can be 2, or dB 114 PowRedStepSize (RED/POC) defines the step size for decreasing the MS/BTS transmission power The step size can be or dB 115 PwrDecrLimitBand (PD0/POC) indicates the maximum size of the variable power decrease step This limit is used only when the MS power is decreased due to signal quality and the averaged signal quality (bit error rate) is better than 0.2% (quality band 0, see GSM Recommendation 05.08 ) The values range from to 38 dB with a step size of dB 116 PwrDecrLimitBand1 (PD1/POC) indicates the maximum size of the variable power decrease step This limit is used only when the MS power is decreased due to signal quality and the averaged signal quality (bit error rate) is between 0.2% and 0.4% (quality band 1, see GSM Recommendation 05.08 ) The values range from to 38 dB with a step size of dB 117 PwrDecrLimitBand2 (PD2/POC) indicates the maximum size of the variable power decrease step This limit is used only when the MS power is decreased due to signal quality and the averaged signal quality (bit error rate) is worse than 0.4% (quality bands 2-7, see GSM Recommendation 05.08 ) The values range from to 38 dB with a step size of dB 118 RadiusExtension (EXT/BTS) indicates the cell radius extension (see Extended Cell and Extended Cell Range ) The range is from to 67 km when the site type is Nokia 2nd generation, and when the site type is Nokia Talk-family, the range is from to 35 km The value km indicates that the cell is an ordinary cell The values from to 67 km indicate that the cell is an extended range cell 119 RxLevBalance (RXBAL/BSC) indicates the difference between the uplink signal level and the downlink signal level within the BSC coverage area The range is from dB to 20 dB, for example, the value dB indicates that the downlink signal is dB stronger than the uplink signal The parameter is set for the BSC 120 RxLevMinCell (SL/ADJ) is the level which the signal level in the adjacent cell must exceed in order for the handover to the adjacent cell to become possible The range is from -110 dBm to -47 dBm The parameter can be defined for each of the 32 adjacent cells 154 (155) # Nokia Corporation Nokia Proprietary and Confidential dn9814129 Issue 12-0 en RF Power Control and Handover Algorithm parameters 121 Synchronised (SYNC/ADJ) indicates whether the adjacent cell is synchronised with the serving cell The value 'yes' indicates that the cells are synchronised The parameter can be defined for each of the 32 adjacent cells 122 TrhoGuardTime (TGT/BSC) indicates the guard time after BSC initiated traffic reason handover during which a power budget handover back to orginal cell is allowed The range is from to 120 seconds 123 TrhoTargetLevel (TRHO/ADJ) is the level which the signal level in the adjacent cell must exceed in order for the traffic reason handover to the adjacent cell to become possible The range is from -109 dBm to -47 dBm, the use of the parameter is disabled when the value is 'not used' The parameter can be defined for each of the 32 adjacent cells Note Traffic reason handover from the serving cell to the adjacent cell in question is disabled when the value of the parameter is 'not used' 124 UpperLimitCellLoadHSCSD (HCU/BTS) determines the upper limit for cell load when multislot TCH allocation is stopped and singleslot allocation is started for the HSCSD calls The range is from to 100% 125 UpperSpeedLimit (USL/HOC) is used for comparing the averaged values of MS speed indications for triggering the handover from a serving layer to an upper layer cell The speed of an MS has to be greater than or equal to the threshold UpperSpeedLimit in order for the HO to be allowed The range is from to 255 The step size is 1, which correlates with speed of km/h The use of the comparison is disabled when the value is zero 126 VariableDLStepUse (VDLS/BSC) indicates whether the variable step size is used in the power control algorithm, when the downlink power is decreased Back to Overview to RF Power Control and Handover Algorithm dn9814129 Issue 12-0 en # Nokia Corporation Nokia Proprietary and Confidential 155 (155) ... signal level 39 RF Power Control and Handover Algorithm: FER 41 10 10.1 RF Power Control 47 RF Power Control and Handover Algorithm: threshold comparison and command 47 RF Power Control and Handover... AmrHandoverHr.ThresholdULRXQual , AmrPowerControlFr PcLowerThresholdDLRxQual , AmrPowerControlFr PcLowerThresholdULRxQual , AmrPowerControlFr PcUpperThresholdDLRxQual , AmrPowerControlFr PcUpperThresholdULRxQual... to RF Power Control and Handover Algorithm 11 RF power control and handovers in BSC 15 RF Power Control and Handover Algorithm: radio link measurement processing in BTS and BSC 19 RF Power Control