Motorola Parameters

System Engineering WorkshopOptimization of BSS parameters &

feature

by

Hong Kong Competency CenterHong Kong Competency Center

Nov, 9, 2000

Preface

Competency: level 2

Workshop Content:

Add Cell Parameters Neighbor Parameters Features

Add Cell Parameters – Idle Mode

IDLE MODE Value RemarksCell Access cell_bar_access_class 0 disable cell_bar_access_switch 0 disable cell_bar_qualify 0 depends on system (DCS1800)Emergency Call Access emergency_class_switch 0 enable for all access classC1 & MS Access Minimum rxlev_access_min 5 higher the value, more secure for call setup ms_power_offset 0 no offset ms_txpwr_max_cch 5 maximum ms output power (33dBm)Reselection Across Location Areas cell_reselect_hysteresis 4 depends on LAC border designCell Reselection C2 cell_reselect_offset 0 dependent cell_reselect_param_ind 0 enable only for particular cell penalty_time 0 dependent temporary_offset 0 dependentChannel and Block Configuration bs_ag_blks_res 1 provide enough channel block for access gran ccch_conf depends on the number of channel equipped in a cellInterference Averging (IOI) intave 8 use for channel allocation priorityPLMN Allowed ncc_of_plmn_allowed must be equal to the NCCPaging bs_pa_mfrms depends on the paging loading extend_paging_active 1 enable extended paging

Add Cell Parameters – Call Setup

CALL SETUP Value RemarksCell Re-establishment reestablish_allowed 1 disableChannel Allocation by Interference Band interfer_bands[0] 0 highest tch allocation priority interfer_bands[1] 8 interfer_bands[2] 13 interfer_bands[3] 18 interfer_bands[4] 25 tch not allocated if exceeded I-band4Channel Requests max_retran 3 maximum 7 retransmission of channel request message tx_integer 12 20 RACH slots are used to spread the transmission threshold 7 maximum 7 attempts to assign SCCPImproved SDCCH & TCH Control (GSR4) sdcch_priority 0 for BCCH, 1 for non-BCCH chan_alloc_priority 0 for BCCH, 1 for non-BCCHMS Access Power Output ms_power_offset 0 no offset ms_txpwr_max_cch 5 maximum ms output power (33dBm)Out Range Timing Advance poor_initial_assignment 1 enable the out range timing advance ms_max_range 63 depends on the site distancePeriodic Location Update Timer rr_t3212 20 MSC detach timer must longer than itSignaling Establishment Timer tt_t3101 2000 time for ms to establish on SDCCHWait Indication Timer wait_indication_parameters 6 waiting time after IA reject message receivedSecond Assignment second_asgnmnt 1 enable second assignment

Add Cell Parameters – Call Queue

CALL QUEUING Value RemarksTCH Queue max_q_length_full_rate_channel 0 depends on MSC features queue_management_information 0 depends on MSC features assign_successful 0 depends on MSC features bssmap_t11 28000 default valueHandover Queuing bssmap_tqho 30000 default valueSDCCH Queue max_q_length_immediate_assignments 0 depends on MSC features max_q_length_sdcch 0 depends on MSC features

Add Cell Parameters – SDCCH Controls

SDCCH CONTROLS Value RemarksAssignment of Resources immediate_assign_mode 0 assign SDCCH onlyChannel Reconfiguration channel_reconfiguration_switch 1 dynamic channel reconfiguration max_number_of_sdcchs depends on ccch_conf sdcch_need_high_water_mark 2 sdcch_need_low_water_mark 11 low_water_mark - high_water_mark >= 9, the value is suitable for all ccch-conf type tch_full_need_low_water_mark 2 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 RTF SD_priority 0 for BCCH, 1 for non-BCCH. BCCH should have the highest priorityPreferred Number of SDCCHs number_sdcchs_preferred depends on ccch_confSDCCH Handover sdcch_ho 0 depends on MSC features sdcch_timer_ho 0 depends on MSC features

Add Cell Parameters – Paging

PAGING Value RemarksChannel and Block Configuration bs_ag_blks_res 1 provide enough channel block for access grant Ccch_conf depends on the number of channel equipped in a cellPaging bs_pa_mfrms depends on the paging loading Extend_paging_active 1 enable extended pagingPeriodic Location Update Timer rr_t3212 20 MSC detach timer must longer than it but short enough to remove dead mobile as

soon as possible

Add Cell Parameters – Call Clear

CALL CLEARING Value RemarksCRM Timer dealloc_inact 10000 time to govern the deallocation of channelNormal Channel Release Timer rr_t3109 12000 time to govern channel release due to radio link timeout, rr_t3109 > radio_link_timeout rr_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 a traffic channel (TCH) after the disconnection of the main signaling linkRadio Link Revival full_pwr_rfloss 1 full power transmit from both ms and bts if link_about_to_fail link_about_to_fail 2 8 SACCH frames (3.84 seconds)Radio Link Timeout (Downlink) radio_link_timeout 4 20 SACCH frames (9.6 seconds)RSS Uplink Failure Detection link_fail 4 20 SACCH frames (9.6 seconds)

Add Cell Parameters – Handover

STANDARD HANDOVER Value RemarksInter-cell Handover inter_cell_handover_allowed 1 enable Intra-cell Handover intra_cell_handover_allowed 1 enable ho_ack 10000 timer specifies the interval allowed to wait for the BTS/BSC assignment of the target handover channel hop_count 0 hop_count_timer 0

Add Cell Parameters - HandoverSTANDARD HANDOVER Value RemarksUplink Quality ul_rxqual_ho_allowed 1 enable rxqual_ul_ho (hreqave, hreqt, qual_weight, qual_pwr_flag, qual_margin_flag, adj_qual_margin) 1,4,1,0,1,x,0 rxquality handover mechanism decision_1_ul_rxqual_av_h 0 bin number l_rxqual_ul_h 452 threshold data_qual_enabled 0 data use the same threshold hop_qual_enabled 0 hopping use the same threshold l_rxqual_ul_h_data 0 l_rxqual_ul_h_hopping 0 decision_1_n6 4 rxquality handover voting decision_1_p6 2 rxquality handover votingUplink Interference interfer_ho_allowed 1 enable rxlev_ul_ho (hreqave, hreqt, qual_margin_flag, adj_qual_margin) 4,1,0,0 interference handover mechanism decision_1_ul_rxlev_av_ih 0 bin number u_rxlev_ul_ih 25 threshold decision_1_n7 1 interference handover voting decision_1_p7 1 interference handover votingDownlink Quality dl_rxqual_ho_allowed enable rxqual_dl_ho (hreqave, hreqt, qual_weight, qual_pwr_flag, qual_margin_flag, adj_qual_margin) 1,4,1,0,1,x,0 rxquality handover mechanism decision_1_dl_rxqual_av_h 0 bin number l_rxqual_dl_h 452 threshold data_qual_enabled 0 data use the same threshold hop_qual_enabled 0 hopping use the same threshold l_rxqual_dl_h_data 0 l_rxqual_dl_h_hopping 0 decision_1_n6 4 rxquality handover voting decision_1_p6 2 rxquality handover votingDownlink Interference interfer_ho_allowed 1 enable rxlev_dl_ho (hreqave, hreqt, qual_margin_flag, adj_qual_margin) 4,1,0,0 interference handover mechanism decision_1_dl_rxlev_av_ih 0 bin number u_rxlev_dl_ih 25 threshold decision_1_n7 1 interference handover voting decision_1_p7 1 interference handover voting

Add Cell Parameters - Handover

STANDARD HANDOVER Value RemarksUplink Level ul_rxlev_ho_allowed 0 disable rxlev_ul_ho (hreqave, hreqt, qual_margin_flag, adj_qual_margin) 4,1,0,0 use as interference handover mechanism decision_1_ul_rxlev_av_h 0 l_rxlev_ul_h don't care decision_1_n5 don't care decision_1_p5 don't careDownlink Level dl_rxlev_ho_allowed 0 disable rxlev_ul_ho (hreqave, hreqt, qual_margin_flag, adj_qual_margin) 4,1,0,0 use as interference handover mechanism decision_1_dl_rxlev_av_h 0 l_rxlev_dl_h don't care decision_1_n5 don't care decision_1_p5 don't careDistance ms_distance_allowed 0 disable ms_max_range 63 use for poor_initial_assignment rel_tim_adv (hreqave, hreqt) don't care decision_1_tim_adv_av_alg 0 decision_1_n8 don't care decision_1_p8 don't carePower Budget pwr_handover_allowed 1 enable rxlev_dl_ho (hreqave, hreqt, qual_margin_flag, adj_qual_margin) 4,1,0,0 use for serving cell surround_cell (hreqave, hreqt) 4,1 use for neighbour cell decision_1_p_bgt_rxlev_av_h 0 bin number decision_1_ncell_rxlev_av_h_calc 0 bin number max_tx_ms (serving cell) 33 use for serving cell ms_txpwr_max_def (internal neighbour default) 33 use for internal neighbour ms_txpwr_max_cell (external neighbour) 33 use for external neighbour use_neighbor_pbgt_hreqave 0 not using the neighbour hreqave

Add Cell Parameters – Other Handover

OTHER HANDOVER Value RemarksCriteria 1 rxlev_min_def (internal neighbour default) 5 use for internal neighbour rxlev_min_cell (external neighbour) 5 use for external neighbourCriteria 2 ho_margin_cell 5Neighbouring Cell Processing disuse_cnt_hreqave 0 disable ho_only_max_pwr 0 disable neighbor_journal 1 no warm up period for neighbors. 0 rxlev is used for the neighbor if it is missing in the measurement report. worse_neighbor_ho 0 disableAlternative Processing of RxQual Measurements alt_qual_proc 0 rxquality represented by %Missing Report missing_rpt 0 disableSatandard MS Handover Power handover_power_level 5 maximum ms power use for handoverMS Handover Power Level Based on Path Loss use_derived_ho_power 1 override handover_power_level

Add Cell Parameters – Other Handover

OTHER HANDOVER Value RemarksDirect Retry & Congestion Handover bounce_protect_cong_tmr 0 bounce_protect_margin 0 bounce_protect_qual_tmr 0 congest_at_source 1 congest_at_target 1 dr_ho_during_assign 0 dr_standard_congest 0 ho_exist_congest 0 msc_preference 0 valid_candidate_period 4000Handover Channel Establishment rr_ny1_rep 20 maximum number of repetitions for the PHYSICAL INFORMATION message rr_t3105 60 repetition between transmissionsHandover Evaluating

bssmap_t7 10000 minimum time interval between the BSS sending of handover required messages for the same connectionHandover margin per cause ho_margin_usage_flag (ho_margin_rxqual / ho_margin_rxlev) 0 disableHandover Rejection handover_required_reject_switch the BSS will not expect to receive a "Handover Required Reject" messageHandover Reporting

handover_recognized_period 12minimum interval between successive HANDOVER REQUIRED messages for the same connection sent by the BTS to the BSC

Incoming Handover en_incoming_ho 1 enable incoming handoverPreferred Target Cells number_of_preferred_cells 6 maximum number of target cells to be included in a Handover Required message

Add Cell Parameters – Adaptive Handover

ADAPTIVE HANDOVER (GSR4) Value RemarksAdaptive Power Budget adap_ho_pbgt 0 disable adap_trigger_pbgt 0Adaptive RxLevel Handover adap_ho_rxlev 0 disable adap_trigger_rxlev_dl 0 adap_trigger_rxlev_ul 0Adaptive RxQual Handover adap_ho_alt_trigger_rxqual 0 disable adap_ho_rxqual 0 adap_trigger_hop_rxqual_dl 0 adap_trigger_hop_rxqual_ul 0 adap_trigger_rxqual_dl 0 adap_trigger_rxqual_ul 0

Add Cell Parameters – Power Control

POWER CONTROL Value RemarksDownlink Power Control due to Level decision_alg_num 1 enables the use of p_con_ack timers bts_p_con_ack 2 timer bts_p_con_interval 2 timer bts_power_control_allowed 1 enable downlink power control pow_inc_step_size_dl 6 power increment step size pow_red_step_size_dl 4 power decrement step size rxlev_dl_pc (hreqave, hreqt) 4,1 power control mechanism decision_1_dl_rxlev_av_p 0 bin number l_rxlev_dl_p optimizing value u_rxlev_dl_p optimizing value decision_1_n1 1 power increment voting decision_1_n2 1 power decrement voting decision_1_p1 1 power increment voting decision_1_p2 1 power decrement votingDownlink Power Control due to Quality decision_alg_num 1 enables the use of p_con_ack timers bts_p_con_ack 2 timer bts_p_con_interval 2 timer bts_power_control_allowed 1 enable downlink power control pow_inc_step_size_dl 6 power increment step size pow_red_step_size_dl 4 power decrement step size rxqual_dl_pc (hreqave, hreqt) 1,4 power control mechanism decision_1_dl_rxqual_av_p 0 bin number l_rxqual_dl_p 113 optimizing value u_rxqual_dl_p 28 optimizing value data_qual_enabled 0 hop_qual_enabled 0 l_rxqual_dl_p_data 0 l_rxqual_dl_p_hopping 0 decision_1_n3 4 power increment voting decision_1_n4 4 power decrement voting decision_1_p3 2 power increment voting decision_1_p4 3 power decrement voting


POWER CONTROL Value RemarksUplink Power Control due to Level decision_alg_num 1 enables the use of p_con_ack timers ms_p_con_ack 2 timer ms_p_con_interval 2 timer ms_power_control_allowed 1 enable uplink power control pow_inc_step_size_ul 6 power increment step size pow_red_step_size_ul 4 power decrement step size rxlev_ul_pc (hreqave, hreqt) 4,1 power control mechanism decision_1_ul_rxlev_av_p 0 bin number l_rxlev_ul_p optimizing value u_rxlev_ul_p optimizing value decision_1_n1 1 power increment voting decision_1_n2 1 power decrement voting decision_1_p1 1 power increment voting decision_1_p2 1 power decrement votingUplink Power Control due to Quality decision_alg_num 1 enables the use of p_con_ack timers ms_p_con_ack 2 timer ms_p_con_interval 2 timer ms_power_control_allowed 1 enable uplink power control pow_inc_step_size_ul 6 power increment step size pow_red_step_size_ul 4 power decrement step size rxqual_ul_pc (hreqave, hreqt) 1,4 power control mechanism decision_1_ul_rxqual_av_p 0 bin number l_rxqual_ul_p 113 optimizing value u_rxqual_ul_p 28 optimizing value data_qual_enabled 0 disable hop_qual_enabled 0 disable l_rxqual_ul_p_data 0 l_rxqual_ul_p_hopping 0 decision_1_n3 4 power increment voting decision_1_n4 4 power decrement voting decision_1_p3 2 power increment voting decision_1_p4 3 power decrement voting


POWER CONTROL Value RemarksOptimised Power Control (GSR4) dyn_step_adj 1 enable dyn_step_adj_fmpr 10 the percentage power reduction used in the dynamic power reduction calculation pow_inc_step_size_dl 6 power increment step size pow_red_step_size_dl 4 power decrement step size pow_inc_step_size_ul 6 power increment step size pow_red_step_size_ul 4 power decrement step sizeOscillation Prevention for MS Power Control mspwr_alg 1 enableRapid MS Power Down rapid_pwr_down 1 enable MS rapid power down rpd_offset 8 power down level in dB rpd_period 2 measuring period rpd_trigger 45 thresholdDownlink Discontinuous Transmission dnlk_vad_dtx 0 enable downlink DTX at XCDR msc_qt 84 default dl_dtx_voice_data 0 enable downlink DTX at BSCUplink Discontinuous Transmission dtx_required 1 MS must use DTX

Add Cell Parameters – TCH Flow Control

There is no parameters that can be optimized to reduce the TCH allocation failure rate since 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.

TCH Flow Control Value Remarks tch_flow_control 1 enable tch_busy_critical_threshold 100 2 access class will be barred when TCH usage reached the threshold tch_busy_norm_threshold 100 1 access class will be barred when TCH usage reached the threshold

Neighbor Parameters – HO Algorithm Type

• Type 1Type 1 - Standard Power Budget- Standard Power Budget• Type 2Type 2 - Macro Neighbor- Macro Neighbor• Type 3Type 3 - Round the Corner Neighbor- Round the Corner Neighbor• Type 4Type 4 - Micro - Micro Neighbor- Micro - Micro Neighbor• Type 5Type 5 - Micro Neighbor- Micro Neighbor• Type 6Type 6 - Siemens Power Budget- Siemens Power Budget• Type 7Type 7 - Adjacent Channel - Adjacent Channel


• Type 1Type 1 - Standard Power Budget- Standard Power Budget

HO Neighbor

Server

SSI (HO Neighbor ) > SSI (Server)

HANDOVERServer MacroHO Neighbor Macro


• Type 2Type 2 - Macro Neighbor- Macro Neighbor

HO NeighborServer

Rx Quality (Server) < THRESHOLD

HANDOVERServer MicroHO Neighbor Macro


• Type 3Type 3 - Round the Corner Neighbor - Round the Corner Neighbor

HO Neighbor

Server

SSI (Server) <THRESHOLD ; Type 1

HANDOVERServer MicroHO Neighbor Macro


• Type 4Type 4 - Micro - Micro Neighbor- Micro - Micro Neighbor

HO Neighbor

Server

Timer (Server) > THRESHOLD ; Type1

HANDOVERServer MicroHO Neighbor Micro


• Type 5Type 5 - Micro Neighbor- Micro Neighbor

Server

SSI , Timer (Neighbor) > THRESHOLD ; Type1

HO Neighbor

HANDOVERServer MacroHO Neighbor Micro


• Type 6Type 6 - Transient Power Budget- Transient Power Budget

Offset, Timer (Overshoot Cell) > THRESHOLD ; Type1


CellOvershoot

HighwayHighway


• Type 7Type 7 - Adjacent Channel - Adjacent Channel

HO Neighbor Server

SSI (Adj. Channel ) - SSI (Server) > THRESHOLD ; Type1


Adjacent Channel


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

The following is the suggested setting for micro cell handover.

Micro Cell Handover Setting

Server HO Neighbor HO Margin HO Algorithm Type HO Algorithm Type Parameters

micro Macro 5 3 UL & DL Threshold = 15

micro micro 5 1

Macro micro -10 ~ -15 5 Delay Timer = 8; Neighbor Threshold = 25

Features – Adaptive Handover

Handover per cause statistics should be collected before activate the adaptive handover. It is used to compare the handover causes before and after activate the adaptive handover. The handover cause ratio should remain no change after the activation.

For a non_hopping system, the ratio of downlink rx-quality and uplink rx-quality to handover cause attempt is normally 10% to 15%.

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

Parameters setting:

If alt_qual_proc is set to 0, the trigger threshold is represented by %.

If alt_qual_proc is set to 1, the trigger threshold is represented by index.

Features – Adaptive Handover

ADAPTIVE HANDOVER (GSR4) Value Remarks

Adaptive Power Budget

adap_ho_pbgt 1 enable PBGT adaptive handover

adap_trigger_pbgt 20 PBGT handover trigger threshold

ho_margin_cell (per neighbor) 0 value accumulate when PBGT > ho_margin_cell, reset to 0 if PBGT < ho_margin_cell

use_neighbor_pbgt_hreqave 0

rxlev_dl_ho [0] (hreqave) 1

surround_cell [0] (hreqave) 1

Adaptive RxLevel Handover

adap_ho_rxlev 0 disable (not recommend)

adap_trigger_rxlev_dl 0

adap_trigger_rxlev_ul 0

Adaptive RxQual Handover

adap_ho_alt_trigger_rxqual 1 enable different trigger threshold for hopping

adap_ho_rxqual 1 enable rxquality adaptive handover

adap_trigger_hop_rxqual_dl 1200 hopping trigger threshold

adap_trigger_hop_rxqual_ul 1200 hopping trigger threshold

adap_trigger_rxqual_dl 1000 non-hopping trigger threshold

adap_trigger_rxqual_ul 1000 non-hopping trigger threshold

l_rxqual_dl_h 226 value accumulate when rxqual > l_rxqual_dl_h, reset to 0 if rxqual < l_rxqual_dl_h

l_rxqual_ul_h 226 value accumulate when rxqual > l_rxqual_ul_h, reset to 0 if rxqual < l_rxqual_ul_h

rxqual_dl_ho [0] (hreqave) 1

rxqual_ul_ho [0] (hreqave) 1

Features – Direct Retry & Congestion Relief

Direct Retry and Congestion Relief is performed after the TCH allocation failure

Allocate TCH fail will be pegged for any TCH allocation failure.

Only improve the Call Setup Success Rate, but not the TCH Congestion Rate.

Accumulated allocate TCH failure may result for activate the Congestion Relief.

MSC may need to extend the assignment complete timer.

Features – Direct Retry & Congestion Relief

Direct Retry Value Remarks msc_preference 0 Directed retry is supported within the BSS, but NOT across the

A-interface. dr_preference 1 enable direct retry procedures dr_allowed (per external neighbor) 0 not allowed for external neighbor as MSC may not support dr_ho_during_assign 1 direct retry during assignment dr_standard_congest 1 direct retry for TCH allocationCongestion Relief Value Remarks bounce_protect_cong_tmr 8 prevent ping-pong handover due to congestion & PBGT bounce_protect_margin 3 prevent ping-pong handover due to congestion & PBGT congest_at_source 1 congest_at_target 1 ho_exist_congest 1 attempt to handover as many calls as the number of queued

assignment requests congest_ho_margin (per neighbor) -5 congestion handover margin mb_tch_congest_threshold 90 Dualband mobile handover to other cell if threshold is reached tch_congest_prevent_threshold 90 Any mobile handover to other cell if threshold is reached

Features – Second Assignment

The second assignment procedure is performed after the mobile fail to access the allocated TCH, assignment failure message is received by BSS.

Improve Call Setup Success Rate.

Per BSC parameter:

chg_ele second_asgnmnt 1 0

Features – Optimized Power Control

•Separate for downlink and uplink.

•Step size can be fixed (2-14dB) or dynamic depends on current power level.

•Downlink oscillation prevention.

•Three types of dynamic step size adjustmentsDynamic power step size increase due to poor RXQUALDynamic power step size increase due to poor RXLEVDynamic power step size reduction due to good RXQUAL

•NO Dynamic power step size reduction due to good RXLEV

•Rapid power down feature overrides any optimized power control decision.


•Power increase due to poor RX quality.occurs when rxqual falls below l_rxqual_ul/dl_pstep size = MAX [ pow_inc_step_size_xx , f high ( Y ) ]where Y = l_rxlev_xx_p + pow_inc_step_size_xx - current_rxlev_xxf high( ) denotes the roundup value to the nearest multiple of 2 dB

•Power increase due to poor RX level.occurs when rxlev falls below l_rxlev_ul/dl_pstep size = fhigh ( Y )where Y = l_rxlev_xx_p + pow_inc_step_size_xx - current_rxlev_xxf high( ) denotes the roundup value to the nearest multiple of 2 dB

•Power decrease due to good RX quality.occurs when rxqual is above u_rxqual_ul/dl_pstep size = MAX [ pow_red_step_size_xx , f low ( Y ) ]where Y = (dyn_step_adj_fmpr /10 ) * (average_rxlev_xx - u_rxlev_xx_p)f low( ) denotes the round down value to the nearest multiple of 2 dB


Optimised Power Control (GSR4) Value Remarks dyn_step_adj 1 enable

dyn_step_adj_fmpr 10the percentage power reduction used in the dynamic power reduction calculation

pow_inc_step_size_dl 6 power increment step size pow_red_step_size_dl 2 power decrement step size pow_inc_step_size_ul 6 power increment step size pow_red_step_size_ul 2 power decrement step size l_rxqual_ul_p 226 optimizing value u_rxqual_ul_p 28 optimizing value l_rxlev_ul_p 25 optimizing value u_rxlev_ul_p 35 optimizing value l_rxqual_dl_p 226 optimizing value u_rxqual_dl_p 28 optimizing value l_rxlev_dl_p 25 optimizing value u_rxlev_dl_p 35 optimizing value

Optimization of BSS parameters & feature

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