Prepared by Yalçın KOÇ

Preface

Competency Level 2

Workshop Content

Add cell ParametersNeighbor ParametersFeatures

IDLE MODE VALUE REMARKSCELL ACCESS

cell_bar_qualify 0; disabledcellBarAccClass 0; disabledcellBarAccess 0; depends on system (DCS1800)

EMERGENCY CALL ACCESSemergencyClass 0; enabled for all access class

C1 & MS ACCESS MINIMUMrxlev_access_min 5;6;8;9;10;12; higher the value, more score for call set upms_power_offset 0; no offsetms_txpwr_max_cch 5; maximum ms output power (33 dBm)

RESELECTION ACROSS LOCATION AREAcellReselectHys 3;4; depends on LAC border design

CELL RESELECTION C2cellReselectOffs 0;2;3; dependentcellReselParamInd 0;1; enable only for particular cellpenalty_time 0;1; 20;31; dependenttemporary_offset 0; dependent

CHANNEL AND BLOCK CONFIGURATIONbs_ag_blks_res 2; provide enough common channel block for access grantccch_conf 0; depends on the number of channel equipped n a cell

INTERFERENCE AVERAGING (IOI)intave 8; use for channel allocation priority

PLMN ALLOWEDnccOfPlmnAllowed 255; must be equal to the NCC

PAGINGbs_pa_mfrms 2; depends on the paging loadextendedPagingAct 1; enabled extended paging

Add Cell Parameters – Idle Mode

CALL SETUP VALUE REMARKSCALL RE-ESTABLIHMENT

reestablishAllwd 1; disabledCHANNEL ALLOCATION BY INTERFERENCE BAND

interfer_band0 1; highest tch allocation priorityinterfer_band1 3; interfer_band2 6; interfer_band3 10; interfer_band4 63; tch not allocated if exceeded I-band4

CHANNEL REQUESTSmax_retran 1;2;3; maximum [2]; [4]; [7] retransmission of channel request messages respectivelytx_integer 15; 50 RACH slots are used to spread the transmissionthreshold 7; CRM (Cell Resource Manager) maximum 7 attempts to assign SCCP

IMPROVED SDCCH & TCH CONTROL (GSR9)sdcch_priority 0;1;2;3 0 for BCCH, 1;2;3 for non-BCCH RTFschan_alloc_priority 3;1; 3 for BCCH, 1 for non-BCCH RTFs

MS ACCESS POWER OUTPUTms_power_offset 0; no offsetms_txpwr_max_cch 5; maximum ms output power (33 dBm)

OUT RANGE TIMING ADVANCEpoor_initial_assignment 0; disabled the out of range timing advancems_max_range 63; depends on the site distance

PERIODIC LOCATION UPDATE TIMERrr_t3212 60; MSC detach timer must longer than it

SIGNALING ESTABLISHMENT TIMERtt_3101 5000; time for ms to establish on SDCCH

WAIT INDICATION TIMERwaitIndicParams 5; waiting time after IMM ASSIGN REJECT message received (T3122 on MS)

SECOND ASSIGNMENTsecond_asgnmnt 1; enabled second assignment

Add Cell Parameters – Call Setup

CALL QUEUE VALUE REMARKSTCH QUEUE

maxQLengthChan 0; depends on MSC featuresqueueMgtInfo 0; depends on MSC featuresassign_successful 15000; Wait time to sent “CLEAR REQUEST MESSAGE” to MSC for successful assignmentbssmap_t11 10000; specifies the wait time for a queued resource request

HANDOVER QUEUINGbssmap_tqho 30000; no free TCHs exist on the target BTS for an inter-BSS handover.

SDCCH QUEUEmaxQLgtSdcchs 0; depends on MSC features

Add Cell Parameters – Call Queue

SDCCH CONTROLS VALUE REMARKSASSIGNMENT OF RESOURCES

immediateAssMode N/A; assign SDCCH only.(deleted by Fast Call Setup Feature)CHANNEL RECONFIGURATION

channelReconfig 1; dynamic channel reconfigurationmaxNumberOfSdcch 128; depends on cch_confsdcchNeedHighWm 2;3;4;5;6;7;8;11;

sdcchNeedLowWm12;13;14;15;16;17;18;20;25; LowWm-HighWm≥9; the value is suitable for all cch_conf type

tchFullNeedLowWm 0;2;3;4; minimum number of TCH reserved for dynamic reconfigurationEXPLICIT SDCCH ASSIGNMENT

sd_load 2; maximum number of timeslots which will be configured as SDCCHs on an RTFsd_priority 0; 0 for BCCH; 1 for non-BCCH. BCCH should have the highest priority

PREFERRED NUMBER OF SDCCHnumSdcchsPref depends on cch_conf

SDCCH HANDOVERsdcch_ho 0; depends on MSC featuressdcch_timer_ho 2; depends on MSC features

Add Cell Parameters – SDCCH Control

PAGING VALUE REMARKSCHANNEL AND BLOCK CONFIGURATION

bs_ag_blks_res 2; provide enough common channel block for access grantccch_conf 0; depends on the number of channel equipped in a cell

PAGINGbs_pa_mfrms 2; depends on the paging loadextendedPagingAct 1; enabled extended paging

PERIODIC LOCATION UPDATE TIMERrr_t3212 60; MSC detach timer must longer than it but short enough to remove dead mobile ASAP

Add Cell Parameters – Paging

CALL CLEARING VALUE REMARKSCRM TIMERS

dealloc_inact 10000; time to govern the deallocation of channelNORMAL CHANNEL RELEASE TIMER

rr_t3109 14400;23000; time to govern channel release due to radio link timeout, rr_t3109>radioLinkTimeoutrr_t3110 timer in ms that is hard coded by the ms manufacturer

rr_t3111_sd 1500;time allowed to delay the deactivation of an SDCCH channel after the disconnection of the main signaling link

rr_t3111_tch 1500;time allowed to delay the deactivation of an traffic channel (TCH) after the disconnection of the main signaling link

RADIO LINK REVIVALfull_pwr_rfloss 1; full power transmit from both ms and bts if llinkAboutToFaillinkAboutToFail 3;6;8; 12;24;32 SACCH frames (5.76; 11.52;15.36 seconds)

RADIO LINK TIMEOUT (DOWNLINK)radioLinkTimeout 4;7;9; 20;32;40 SACCH frames (9.6;15.36;19.2 seconds)

RSS UPLINK FAILURE DETECTION

link_fail 4;7;8;

20;32;36 SACCH frames (9.6;15.36;17.28 seconds) the number of lost SACCH multiframes before a loss ofSACCH is reported to Abis

Add Cell Parameters – Call Clearing

STANDART HANDOVER VALUE REMARKSINTER-CELL HANDOVER

interCellHoAllowd 1; enabledINTRA-CELL HANDOVER

intraCellHoAllowd 1; enabled

ho_ack 10000;timer specifies the interval allowed to wait for the BTS/BSC assignment of the target handover channel

hop_count 1; limits the number of intra-cell interference handovers for a call

hop_count_timer 30; within the time set by the hop_count_timer, the system escalates the handover to an RXQUAL handover to another cell

Add Cell Parameters – HandOver

STANDART HANDOVER VALUE REMARKSUPLINK QUALITY

ulRxqualHoAllowed 1; enabled

alg_num 0; unweightedrxqual_ul_ho (hreqave;hreqt;qual_weight; qual_power_flag;qual_margin_flag;adj_qual_margin) 1;4;1;;;; rxquality handover mechanismdec1UlRxqualAv_h 0; bin numberl_rxqual_ul_h 250;400; thresholdho_margin_rxqual 2; data_qual_enabled 0; data use the same threshold. A data call such as modem-to-modem callhop_qual_enabled 1; hopping use differentlRxqualUlHData 0; threshold is meaningless for datalRxqualUlHHopping 250;460; threshold for hopping calldecision_1_n6 1;2;3;4; rxquality handover votingdecision_1_p6 1;2;3; rxquality handover voting

UPLINK INTERFERENCEinterferHoAllowed 1; enabled

alg_num 0; unweighted

rxlev_ul_ho (hreqave;hreqt;qual_margin_flag; adj_qual_margin) 8;1;;; interference handover mechanismdec1UlRxlevAv_ih 0; bin numberu_rxlev_ul_ih 40; thresholddecision_1_n7 1; interference handover votingdecision_1_p7 1; interference handover voting

DOWNLINK QUALITYdlRxqualHoAllowed 1; enabledrxqual_dl_ho (hreqave;hreqt;qual_weight; qual_power_flag;qual_margin_flag;adj_qual_margin) 1;4;1;; rxquality handover mechanismdec1DlRxqualAv_h 0; bin numberl_rxqual_dl_h 250;300;450; thresholdho_margin_rxqual 2; data_qual_enabled 0; data use the same thresholdhop_qual_enabled 1; hopping use differentlRxqualDlHData 0; threshold is meaningless for datalRxqualDlHHopping 250;460; threshold for hopping calldecision_1_n6 1;2;3;4; rxquality handover votingdecision_1_p6 1;2;3; rxquality handover voting

UPLINK INTERFERENCEinterferHoAllowed 1; enabled

rxlev_ul_ho (hreqave;hreqt;qual_margin_flag; adj_qual_margin) 8;1;;; interference handover mechanismdec1UlRxlevAv_ih 0; bin numberu_rxlev_ul_ih 40; thresholddecision_1_n7 1; interference handover votingdecision_1_p7 1; interference handover voting

Add Cell Parameters – HandOver

STANDART HANDOVER VALUE REMARKSUPLINK LEVEL

ulRxlevHoAllowed 0;1; disabled;enabled;alg_num 0; unweightedrxlev_ul_ho (hreqave;hreqt;qual_margin_flag; adj_qual_margin) 8;1;;; use as interference handover mechanismdec1UlRxlevAv_h 0; bin numberl_rxlev_ul_h 5; thresholdho_margin_rxlev decision_1_n5 1; rxlevel handover votingdecision_1_p5 1; rxlevel handover voting

DOWNLINK LEVELdlRxlevHoAllowed 1; enabledalg_num 0; unweightedrxlev_dl_ho (hreqave;hreqt;qual_margin_flag; adj_qual_margin) 8;1;;; use as interference handover mechanismdec1DlRxlevAv_h 0 bin numberl_rxlev_dl_h 8; thresholdho_margin_rxlev decision_1_n5 1; rxlevel handover votingdecision_1_p5 1; rxlevel handover voting

DISTANCEmsDistanceAllowed 0; disabled ms_max_range 20;63; use for poor_initial_assignmentrel_tim_adv (hreqave;hreqt) 4;1; don't caredec1TimAdvAv_alg 0; bin numberdecision_1_n8 1; don't caredecision_1_p8 1; don't care

POWER BUDGETpwrHoAllowed 1; enabledalg_num 0; unweightedrxlev_dl_ho (hreqave;hreqt;qual_margin_flag; adj_qual_margin) 8;1;; use for serving cellsurround_cell (hreqave;hreqt) 4;1; use for neighbor celldec1PBgtRxlevAv_h 0; bin numberdec1NcellRxlevAvH 0; bin numberho_margin_pbgt max_tx_ms (serving cell) 33; use for serving cellms_txpwr_max_def (internal neighbor default) 33; use for internal neighborms_txpwr_max_cell (external neigbor) 33; use for external neighboruseNeiPbgtHreqave 0;1; not using / using the neighbor hreqave hreqave 4; used for neighbor hreqave

Add Cell Parameters – HandOver

OTHER HANDOVER VALUE REMARKSCRITERIA 1

rxlev_min_def (internal neighbor default) 6;8;10;12;14; use for internal neighborrxlev_min_cell (external neighbor) 6; use for external neighbor

CRITERIA 2ho_margin_def 3;6; use if no specific margin defined

NEIGHBORING CELL PROCESSINGdisuse_cnt_flag 0; disabled; Maximum disuse count is set to 8ho_onlymax_pwr 0; disabled

neighbor_journ 1;no warm up periods for neighbor. 0 rxlev is used for the neighbor if it is missing in the measurement period

worse_nei_ho 0; disabledALTERNATIVE PROCESSING OF RXQUAL MEASUREMENTS

alt_qual_proc 0; rxquality represented by %. Bit Error Rate (BER)MISSING REPORT

missing_rpt 0;1; disabled; enabledSTANDART MS HANDOVER POWER

handoverPwrLevel 5; maximum ms power use for handoverMS HANDOVER POWER LEVEL BASED ON PATH LOSS

use_drv_ho_pwr 0; BSS Derive Handover Power

Add Cell Parameters – Other HandOver

OTHER HANDOVER VALUE REMARKSDIRECT RETRY & CONGESTION HANDOVER

bnce_prt_mgn 0;6;8;12; specifies the level by which a target cell must exceed the serving cellbnce_prt_qual_tmr 0;12;18; bnce_prt_cong_tmr 12;60; congest_at_target 0;1; congest_at_source 1; congest_ho_margin (per neighbor) 0; congestion handover margindr_std_congest 0; directed retry for TCH allocation not alloweddr_ho_dur_assign 0; directed retry during assignment not allowedmsc_preference 0; directed retry is supported within the BSS, but NOT across the A-interfaceho_exist_congest 1;2; retry_cand_period 4000; exRtryCandPrd 4000; validCandPeriod 4000; tch_congprev_thr 70;90;100; any mobile handover to other cell if threshold is reachedmb_tch_cong_thres 1; dualband mobile handover to other cell if threshold is reached

HANDOVER CHANNEL ESTABLISHMENTrr_ny1_rep 20; maximum number of repetitions for the PHYSICAL INFORMATION messagerr_t3105 60; repetition between transmissions

HANDOVER EVALUATING

bssmap_17 minimum time interval between the BSS sending of handover required messages for the same connections

HANDOVER MARGIN PER CAUSEho_mgn_use_flag (ho_mgn_rxl/ho_mgn_rxq) 1; enabled

HANDOVER REJECTIONhandover_required_reject_switch the BSS will not expect to receive a "HANDOVER REQUIRED REJECT" message

HANDOVER REPORTING

handoverRecPeriod 8;minimum interval between successive "HANDOVER REQUIRED" messages for the same connection sent by the BTS to the BSC

INCOMING HANDOVERen_incom_ho 1; enabled incoming handover

PREFERRED TARGET CELLnumOfPrefCells 6; maximum number of target cells to be included in a "HANDOVER REQUIRED" message

Add Cell Parameters – Other HandOver

ADAPTIVE HANDOVER VALUE REMARKSADAPTIVE POWER BUDGET

adap_ho_pbgt 0; disabledadap_trigger_pbgt 0;

ADAPTIVE RXLEVEL HANDOVERadap_ho_rxlev 0; disabledadap_trig_rl_dl 0; adap_trig_rl_ul 0;

ADAPTIVE RXLEVEL HANDOVERadap_ho_al_trg_rq 0; disabledadap_ho_rxqual 0; adap_trg_hop_rqdl 0; adap_trg_hop_rqul 0; adap_trig_rq_dl 0; adap_trig_rq_ul 0;

Add Cell Parameters – Adaptive HandOver

POWER CONTROL VALUE REMARKSDOWNLINK (BTS) POWERCONTROL DUE TO LEVEL

decision_alg_type 1; enables the use of p_con_ack timersbts_p_con_ack 1;2; timerbts_p_con_intervl 2; timerbtsPwrCntlAllowed 1; enable downlink power controlpow_inc_stepsz_dl 6; power increment step sizepow_red_stepsz_dl 2; power decrement step sizerxlev_dl_pc (hreqave, hreqt) power control mechanismdec1DlRxlevAv_p 0; bin numberl_rxlev_dl_p 17;20; optimizing valueu_rxlev_dl_p 23;26;27;30 optimizing valuedecision_1_n1 1; power increment votingdecision_1_n2 1; power decrement votingdecision_1_p1 1; power increment votingdecision_1_p2 1; power decrement voting

DOWNLINK (BTS) POWERCONTROL DUE TO QUALITYdecision_alg_type 1; enables the use of p_con_ack timersbts_p_con_ack 1;2; timerbts_p_con_intervl 2; timerbtsPwrCntlAllowed 1; enable downlink power controlpow_inc_stepsz_dl 6; power increment step sizepow_red_stepsz_dl 2; power decrement step sizerx_qual_pc (hreqave, hreqt) power control mechanismdec1DlRxqualAv_p 0; bin numberl_rxqual_dl_p 150;256; optimizing valueu_rxqual_dl_p 50; optimizing valuedata_qual_enabled 0; hop_qual_enabled 1; lRxqualDlPData 0; optimizing valuelRxqualDlPHopping 120;150;226; optimizing valuedecision_1_n3 2;4; power increment votingdecision_1_n4 1;2;4; power decrement votingdecision_1_p3 1;2; power increment votingdecision_1_p4 1;2;4; power decrement voting

Add Cell Parameters – Power Control

POWER CONTROL VALUE REMARKSUPLINK (MS) POWERCONTROL DUE TO LEVEL

decision_alg_type 1; enables the use of p_con_ack timersms_p_con_ack 2;3; timerms_p_con_interval 2; timermsPowerCntlAllowd 1; enable uplink power controlpow_inc_stepsz_ul 6; power increment step sizepow_red_stepsz_ul 2; power decrement step sizerxlev_ul_pc (hreqave, hreqt) power control mechanismdec1UlRxlevAv_p 0; bin numberl_rxlev_ul_p 18;20;21;22;27; optimizing valueu_rxlev_ul_p 24;28;30;32;35;37; optimizing valuedecision_1_n1 1; power increment votingdecision_1_n2 1; power decrement votingdecision_1_p1 1; power increment votingdecision_1_p2 1; power decrement voting

UPLINK (MS) POWERCONTROL DUE TO QUALITYdecision_alg_type 1; enables the use of p_con_ack timersms_p_con_ack 1;2; timerms_p_con_intervl 2; timermsPowerCntlAllowd 1; enable uplink power controlpow_inc_stepsz_ul 6; power increment step sizepow_red_stepsz_ul 2; power decrement step sizerx_qual_pc (hreqave, hreqt) power control mechanismdec1UlRxqualAv_p 0; bin numberl_rxqual_ul_p 150; optimizing valueu_rxqual_ul_p 50; optimizing valuedata_qual_enabled 0; hop_qual_enabled 1; lRxqualUlPData 0; optimizing valuelRxqualUlPHopping 120;226; optimizing valuedecision_1_n3 2;4; power increment votingdecision_1_n4 1;2;4; power decrement votingdecision_1_p3 1;2; power increment votingdecision_1_p4 1;2;4; power decrement voting

Add Cell Parameters – Power Control

POWER CONTROL VALUE REMARKSOPTIMIZED POWER CONTROL

dyn_step_adj 1; enableddyn_step_adj_fmpr 3;5;10; the percentage power reduction used in the dynamic power reduction calculationpow_inc_stepsz_dl 6; power increment step sizepow_red_stepsz_dl 2; power decrement step sizepow_inc_stepsz_ul 6; power increment step sizepow_red_stepsz_ul 2; power decrement step size

OSCILLATION PREVENTION FOR MS POWER CONTROLmspwr_alg 1; enabled

RAPID MS POWER DOWNrapid_pwr_down 0;1; disabled;enabledrpd_offset 0; power down level in dBrpd_period 2; measuring periodrpd_trigger 30; threshold

DOWNLINK DISCONTINUOUS TRANSMISSONdnlk_vad_dtx enables downlink DTX at XCDRmsc_qt defaultdl_dtx_voice_data 0; enables downlink DTX at BSC

DOWNLINK DISCONTINUOUS TRANSMISSONdtx_required 1; ms must use DTX

Add Cell Parameters – Power Control

Add Cell Parameters – TCH Flow Control

TCH FLOW CONTROL VALUE REMARKStch_flow_control 0; disabledtch_busy_critical_threshold 2 access class will be barred when TCH usage reached the thresholdtch_busy_norm_threshold 1 access class will be barred when TCH usage reached the thresholdflow_control_t1 10000; wait time before the Flow Control mechanism considers new overload messagesflow_control_t2 20000;30000; wait time before a previously flow control barred access class is brought back in service

There is no parameters that can be optimized to reduce theTCH allocation failure rateSince it is related to the system design. However, TCH Flow control can restrict mobile to access the cell when the cell is busy and hence reduce the occurrence of TCH allocation Failure.

If TCH flow control is activated the paging response rate may lowered.

Neighbor Parameters – HO Algorithm Type

Type 1 – Standart Power Budget

Type 2 – Macro Neighbor

Type 3 – Round the corner neighbor

Type 4 – Micro - Micro Neighbor

Type 5 – Micro Neighbor

Type 6 – Siemens Power Budget

Type 7 – Adjacent Channel

server

HO Neig

HANDOVER

Server MacroHO Neig

Macro

SSI (HO Neig) > SSI (Server)

Neighbor Parameters – HO Algorithm Type

Type 1 – Standart Power Budget

HANDOVER

Server MicroHO Neig

Macro

RxQuality (Server) < Threshold)

Neighbor Parameters – HO Algorithm Type

Type 2 – Macro Neighbor

server

HO Neig

HANDOVER

Server MicroHO Neig

Macro

SSI (Server) < Threshold); Type 1

Neighbor Parameters – HO Algorithm Type

Type 3 – Round the Neighbor

server

HO Neig

HANDOVER

Server MicroHO Neig

Micro

Timer(Server) >Threshold); Type 1

Neighbor Parameters – HO Algorithm Type

Type 4 – Micro – Micro Neighbor

server

HO Neig

HANDOVER

Server MacroHO Neig

Micro

SSI, Timer (Neighbor) >Threshold); Type 1

Neighbor Parameters – HO Algorithm Type

Type 5 – Micro Neighbor

server

HO Neig

HANDOVER

Server MacroHO Neig

Macro

Offset, Timer (Overshoot Cell) > Threshold, Type 1

Neighbor Parameters – HO Algorithm Type

Type 6 – Transient Power Budget

HO Neig

Server

Cell

Overshoot

HANDOVER

Server MacroHO Neig

Macro

SSI (Adjacent Channel)- SSI (Server) > Threshold, Type 1

Neighbor Parameters – HO Algorithm Type

Type 7 – Adjacent Channel

HO Neig

Server

Adjacent

Channel

MICRO CELL HANDOVER SETTINGSSERVER HO NEIGHBOR HO MARGIN HO ALGORITHM TYPE HO ALGORITHM TYPE PARAMTERSMicro Macro 6 3 UL & DL Threshold = 18Micro Micro 6 1 Macro Micro -12 ~ - 18 5 Delay Timer= 10; Neighbor Threshold = 25

Neighbor Parameters – HO Algorithm Type

All the algorithm type can also be used for Macro –to –Macro cell handover for traffic sharing.

The fallowing is the suggested setting for microcell handover

Features– Adaptive Handover

Handover per cause statistic should be collected before activate the adaptive handover.

It is used to compare the handover causes before and after activate the adaptive handover.

Handover cause ratio should remain no change after activation.

For a non-hoping systems, the ration of the downlink rxqualiy and uplink rxquality to Handover cause attempt is normaly 10% to 15 %

For a hopping system the ratio is around %20 to 30%

POWER CONTROL VALUE REMARKSADAPTIVE POWER BUDGET

adap_ho_pbgt 1; enable PBGT Adaptive Handoveradap_trigger_pbgt 20; PBGT handover trigger thresholdho_margin_cell (per neighbor) 0; value accumulate when PBGT > ho_margin_cell, reset to 0 if PBGT< ho_margin_celluse_neighbor_pbgt_hreqave 0; rxlev_dl_ho[0] (hreqave) 1; surround_cell[0] (hreqave) 1;

ADAPTIVE RXLEVEL HANDOVERadap_ho_rxlev 0; disabled (not recommended)adap_trig_rl_dl 0; adap_trig_rl_ul 0;

ADAPTIVE RXQUAL HANDOVERadap_ho_al_trg_rq 1; enable different trigger threshold for hoppingadap_ho_rxqual 1; enable rxquality adaptive handoveradap_trg_hop_rqdl 1200; hopping trigger thresholdadap_trg_hop_rqul 1200; hopping trigger thresholdadap_trig_rq_dl 1000; non-hopping trigger thresholdadap_trig_rq_ul 1000; non-hopping trigger thresholdl_rxqual_dl_h 226; value accumulate when rxqual>l_rxqual_dl_h, reset to 0 if rxqual<l_rxqual_dl_hl_rxqual_ul_h 226; value accumulate when rxqual>l_rxqual_ul_h, reset to 0 if rxqual<l_rxqual_ul_hrxqual_dl_ho[0] (hreqave) 1 rxqual_ul_ho[0] (hreqave) 1

Features– Adaptive Handover