LTE Parameter & Features Recommendation_Part-1

LTE Parameter Parameter & Features Features Recommendation

Orange Cote d'ivoire

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Topics                   

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LTE1402: Uplink Intra eNodeB CoM Activation & Parameter Trails Uplink Improved Latency Reaction Timer ( ilReacTimerUl ilReacTimerUl)) expectedCellSize need to change as per UE propagation Power Control Parameter Need to Change_ ulpcLowqualSch ulpcLowqualSch Timer T300 _Need to increase increase from 400ms (default value) to 600ms Low MIMO Utililization_Suspected MIMO Cross Need Site Intervention Poor MIMO Utilization_CQI Parameter need to change( mimoClCqiThD & mimoClCqiThU mimoClCqiThU)) Threshold for Coverage Based Handover(Intra & Inter Freq) Need to change Better Cell Handover Threshold Need to change DRX Features is disabled in many cells & DrxDuringMeasGap need to activate_ LTE1679 activate_ LTE1679 qrxlevmin Need to Change to -124 dBm Cells having High UL RSSI for PUSCH  Activate LTE1617 LTE1617 _RLF  _RLF triggered handover handover and Reestablishment Reestablishment Timer Timer Need to Tune Scheduling & PUCCH Parameter Need to Tune sNonIntrsearch _Inter-frequency and inter-RAT inter-RAT measurements threshold_ Need Need to change Cell Reselection Absolute Prio _ cellReSelPrio & Nbr Prio _eutCelResPrio Prio _eutCelResPrio Need to decide and set LTE1685 Neighbor Relation Robustness Feature Implementation LTE1944 dynamic handover blacklisting Feature Implementation LTE1495 _Fast Uplink Adaptation Trail Trail

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Part-1

Topics                   

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LTE1402: Uplink Intra eNodeB CoM Activation & Parameter Trails Uplink Improved Latency Reaction Timer ( ilReacTimerUl ilReacTimerUl)) expectedCellSize need to change as per UE propagation Power Control Parameter Need to Change_ ulpcLowqualSch ulpcLowqualSch Timer T300 _Need to increase increase from 400ms (default value) to 600ms Low MIMO Utililization_Suspected MIMO Cross Need Site Intervention Poor MIMO Utilization_CQI Parameter need to change( mimoClCqiThD & mimoClCqiThU mimoClCqiThU)) Threshold for Coverage Based Handover(Intra & Inter Freq) Need to change Better Cell Handover Threshold Need to change DRX Features is disabled in many cells & DrxDuringMeasGap need to activate_ LTE1679 activate_ LTE1679 qrxlevmin Need to Change to -124 dBm Cells having High UL RSSI for PUSCH  Activate LTE1617 LTE1617 _RLF  _RLF triggered handover handover and Reestablishment Reestablishment Timer Timer Need to Tune Scheduling & PUCCH Parameter Need to Tune sNonIntrsearch _Inter-frequency and inter-RAT inter-RAT measurements threshold_ Need Need to change Cell Reselection Absolute Prio _ cellReSelPrio & Nbr Prio _eutCelResPrio Prio _eutCelResPrio Need to decide and set LTE1685 Neighbor Relation Robustness Feature Implementation LTE1944 dynamic handover blacklisting Feature Implementation LTE1495 _Fast Uplink Adaptation Trail Trail

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Part-1

Introduction(Why use UL CoMP? The uplink intra eNB Co-ordinated Multipoint Multipoint (CoMP) feature improves average cell throughput and the cell edge performance by taking into account the uplink information received from neighbor cell antennas

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This feature increases the UL TP and hence also service quality for UEs on the cell edge regions of intra eNB neighbour cells configured in the CoMP set.

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Receive UEs uplink signal by more than one cell • Intra eNB CoMP: cells involved in reception of the UE belong to the same eNB (cells are colocated)

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LTE1402: UL inter-cell intra eNB reception + Interference LTE1402: Interference Rejection Combining Combining (IRC), UL SINR enhancement allows for increased UL throughput on average and cell edge

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UL CoMP •

With co-located cells being processed by the same System Module, sharing data among cells is no longer a problem

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UEs in the internal cell boundaries will be received with similar levels by serving and neighbor cell -

Intra eNB UL CoMP is possible within internal cell boundaries

Sector3 LCR3: Tx1 & Rx1 Sector3 LCR3: Tx2 & Rx2

Sector2 LCR2: Tx1 & Rx1

Sector2 LCR2: Tx1 & Rx2

No UL CoMP between different eNBs

Sector1 LCR1: Tx1 & Rx1

Sector1 LCR1: Tx2 & Rx2 UL CoMP

RF Module

System Module

UL CoMP O p t 6

O p t 1

O p t 2

O p t 3

UL CoMP 4

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UL CoMP UL CoMP set consists of three cells. To receive a signal from the UE in the center of the cell number 2, the eNB uses only two Rx antennas from the serving cell because in the cell 1 and 3 signal from this UE is too low. When the UE is close to cell edge, the eNB combines signal received via two Rx antennas from the serving cell 2 and two Rx antennas from the neighbor cell 3 using IRC algorithm .

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UL CoMP Users on the m ain lobe do not benefit because antenna beam of neighboring cell has poor gain on this direction

All 3GPP Rel. 8 compliant UEs will benefit from this feature.

When the UE is close to cell edge, the eNB combines signal received via two Rx antennas from the serving cell 2 and two Rx antennas from the neighbor cell 3 using IRC algorithm

Users in between cell borders have a good chance to have similar path loss to both c ells and benefit from UL CoMP.

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In LTE1402 Interference Rejection Combining (IRC) algorithm is used for UL reception

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UL CoMP : Technical Details Example: Cell N2 selected for UL combining, cell N1 has too large SINR difference to serving cell 15

ulCoMpSinrThreshold  10

SINR_S 5

SINR_N2 SINR_N1

0

-5

Only the UEs that are received in the neighbor cell with SINR higher than -10dB AND of which neighbor cell SINR is no less than ulCompSinrThresh below their serving cell SINR can be received using CoMP combining.

Example: Cell N2 selected for UL combining, cell N1 has SINR difference to serving cell OK, but N2 has higher SINR 15

ulCoMpSinrThreshold  10

SINR_S 5

SINR_N2 SINR_N1

KPI: Percentage of UEs using CoMP in the cell

0

LTE_1261a -5

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UL CoMP : Technical Details •

CoMP set

In LTE 1402 cells that can be potentially used for joint UL reception form a CoMP Set LTE1402 is used with 2Rx antennas, In this up to 2 cells can be selected for UL reception from so called CoMP sets containing up to 3 cells ,Cell selection is performed per TTI based on instantaneous SINR measurements. CoMP reception can only be done for PUSCH. Other UL physical channels are received by serving cell antennas. Includes serving cell plus best Intra-eNB neighbor cell CoMP set can contain up to 3 cells.

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UL CoMP : Technical Details KPIs need to monitor

UL_INTRA_COMP_UE_AVG[#] Percentage of UE Using UL CoMP[%]  Avg PDCP cell thp UL[kbps]

UL PDCP SDU Volume[MB]  Avg SINR for PUSCH[dB]  Avg MCS PUSCH trans[#]

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UL CoMP : Parameters Abbreviated Name

MO Class

Full Name

Description

Range and step

actUlCoMp

LNBTS

 Activate Uplink CoMP

Uplink coordinated multipoint (CoMP) reception activation for the eNB.

0 (false), 1 (true)

ulCoMpId

ULCOMP

Uplink coordinated multipoint identifier 

This parameter uniquely identifies a ULCOMP instance.

0...8, step 1

ulCoMpCellList

ULCOMP

Uplink CoMP Cell List

List of cells belonging to the same uplink comp set.

0...65535, step 1

Uplink CoMP SINR Threshold

Signal-Interference-Noise Ratio to be use for uplink CoMP operation. The received uplink signal from a neighbor cell is combined to the serving cell signal if its SINR is less than ulCoMPSinrThreshold below the SINR of the serving cell signal. The recommended default value is for: - 2RX CoMP: 10 dB - 4RX CoMP: 15 dB

-20...30 dB, step 1 dB

ulCoMpSinrThreshold

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ULCOMP

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Default Value

10 dB

Uplink Improved Latency Reaction Timer(ilReacTimer ) Uplink Improved Latency Reaction Timer(ilReacTimer ) defines the time in which the UE has to send useful data after either the initial dummy grant or a previous reception of useful data. If the Timer expires , the UE will not get dummy grant anymore.

Ranges: 0….2000ms , Steps 5 ms It defines length of Uplink Improved Latency Reaction Timer (IULRT) , which determine period when UE has UL grant proactively assigned (even if it has nothing to send). Described functionally is used to reduce and UL latency – as UE has an UL grant assigned , it doesn't have to request its via scheduling . As a result reduced latency in ping response among others is expected .

*We can make the TRIAL with different values in different phases Values: 0 , 5, 10, 20 , 50 , 100 ms

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Uplink Improved Latency Reaction Timer(ilReacTimer )

Each time when UE is in RRC connected and there is no data f or the UE in UL buffer, the UE is scheduled with dummy grants by the time defined by ilReactTimer. When it expires , UE will not get any UL Grant intended for UL proactive scheduling.

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Uplink Improved Latency Reaction Timer(ilReacTimer ) KPIs need to monitor

• • • •

E-RAB performance improved RRC Stp SR improved Int Pow improved UL PRB usage improved

• • • • •

Compl RACH Stp SR UL MCS UL BLER degraded PHR degraded IP Sch Thrpt degraded

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expectedCellSize need to change as per UE propagation expectedCellSize: This parameter determines the appropriate counter histogram range (set), which should be aligned with the expected size of the cell from preceding network planning. Abbreviated Name

MO Class

Range and step

Formula for Getting Internal Value gui ==> internal

expectedCellSize

LNCEL

2.1km (1), 5km (2), 10km (3), 15km (4), 30km (5), 60km (6), 100km (7)

2.1km ==> 1 5km ==> 2 10km ==> 3 15km ==> 4 30km ==> 5 60km ==> 6 100km ==> 7

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In our network the present value 4 (15km) and which is regardless of the cell TA reports

expectedCellSize need to change as per UE propagation expectedCellSize =4

expectedCellSize =1

expectedCellSize =2

expectedCellSize =3

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Power Control Parameter Need to Change_ ulpcLowqualSch PPUSCH (i) :PUSCH Power in subframe i 

Open Loop (OL)

Closed Loop (CL)

 P PUSCH (i )  min { P CMAX ,10 log 10 ( M PUSCH (i ))  P O_PUSCH ( j )   ( j )  PL   TF (i )   f  (i )} dBm 

 All the parameters are signaled to the UE from eNodeB

P PUSCH  (i) = min {P CMAX , (

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OL + CL)}

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Power Control Parameter Need to Change_ ulpcLowqualSch Close Loop PC

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Power Control Parameter Need to Change_ ulpcLowqualSch ulpcUpqualSch: Upper threshold of the power control window for the SINR (signal quality) for PUSCH/SRS component. Current Value : 20(OK) ulpcLowqualSch :Lower threshold of the power control window for the SINR (signal quality) for PUSCH / SRS component Current Value : 0 Proposed: 4 ulpcLowlevSch: Lower threshold of the power control window for the RSSI (si gnal level) for PUSCH / SRS component Current Value : -103(OK)

ulpcUplevSch : Upper threshold of the power control window for the RSSI ( signal level) for PUSCH / SRS component. Current Value : -88(OK) 18

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Power Control Parameter Need to Change_ ulpcLowqualSch Decis ion matrix for PUS CH  ulpcUpqualSch High Thresh. For SINR for PUSCH LNCEL; -47...80dB; 1dB ; 20dB SINR + 1 dB or 

- 1 dB

- 1 dB

+ 3 dB 1

2

3

UP_QUAL_** + 1 dB or 

0 dB

-1 dB

+ 3 dB 4

LOW_QUAL_**

5

+ 1 dB or 

+ 1 dB or 

+ 1 dB or 

+ 3 dB

+ 3 dB

+ 3 dB

7

LOW_LEV_**

ulpcLowqualSch Low Thresh. For SINR for PUSCH LNCEL; -47...80dB; 1dB ; 0dB 19

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6

8

UP_LEV_**

*Too Low SINR setting will limit the throughput of UE’s in good condition: Cell – Center UE’s are forced to lower down the power.

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RSSI

ulpcLowlevSch

ulpcUplevSch

Low Thresh. For RSSI for PUSCH -127...0dBm;1dBm ;-103dBm -LNCEL; Creator - DocID

High Thresh. For RSSI for PUSCH LNCEL; -127...0dBm;1dBm ;-88dBm

Timer T300 _Need to increase from 400ms (default value) to 600ms We have cells which having poor RRC Stp SR . We need to increase the Timer T300from 400ms (default value) to 600ms.

T300: Timer T300 supervises the RRC connection establishment procedure. Start: Transmission of RRCConnectionRequest Stop: Reception of RRCConnectionSetup or RRCConnectionReject message, cell re-selection and upon abortion of connection establishment by upper layers Please find the attached cells. Ranges: 100ms (0), 200ms (1), 300ms (2), 400ms (3), 600ms (4), 1000ms (5), 1500ms (6), 2000ms (7)

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Low MIMO Utililization_Suspected MIMO Cross_Need Site Intervention Many cells which having very low MIMO Utilization and it seems having MIMO Cross. Need site intervention to check the Antenna and feeder.

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Low MIMO Utililization_Suspected MIMO Cross_Need Site Intervention MIMO Cross Example

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Poor MIMO Utilization_CQI Parameter need to

change(mimoClCqiThD & mimoClCqiThU)

mimoClCqiThD :CQI Threshold for fallback to closed loop MIMO single codeword transmission (in CQI) : { internal_value = gui_value * 10} Current Value: 70 Proposed Value: 60

mimoClCqiThU : CQI Threshold for activation of closed loop MIMO dual codeword transmission (in CQI). { internal_value = gui_value * 10}

Current Value: 80 Proposed Value: 70

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Better cell HO a3offset = 12(Current Value) a3offset = 6(Proposed Value) a3TimeToTrigger = 1(40ms-Current Value) a3TimeToTrigger = 8(320ms-Proposed Value)

This setting will allow UE to make faster Handover comparatively .

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Coverage Based Handover (Intra Freq)

threshold3 = 30(Current Value) threshold3a = 36(Current Value)

threshold3 = 30 (OK) threshold3a = 32 or 34 (Proposed)

This setting will allow UE to make faster Handover comparatively .

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Coverage Based Handover (Inter Freq) threshold2InterFreq = Threshold for RSRP of serving cell for start of inter frequency measurements: LNCEL:-140...-43 dBm, step 1 dBm: Current Value: 45 {internal_value = (gui_value + 140} = -95 Proposed : 28 => -112

The current value is having no meaning , because start and ending of measurement at same value.

Threshold2a = Threshold for RSRP of serving cell for stopping of Inter-RAT (InterFreq) Measurements : LNCEL: -140...-43 dBm, step 1 dBm Current Value: 45 {internal_value = (gui_value + 140} = -95 Proposed : 32 => --108 threshold3InterFreq = Threshold for RSRP of serving cell. I f RSRP of serving value < threshold3InterFreq and RSRP of neighbour cell > threshold3aInterFreq then handover is triggered (A5 event): Current Value: 30 => -110 (OK) threshold3aInterFreq : Threshold for RSRP of neighbour cell. If RSRP of serving value < threshold3InterFreq and RSRP of neighbour cell > threshold3aInterFreq then handover is triggered (A5 event) Current Value : 36 & 12 => --104 & -128 Proposed : 34 => -106

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LTE1679 – DRX with parallel UE measurement gaps • With FL15A/TL15A release, there is a possibility to use DRX with parallel UE measurement gaps (LTE1679) -

LTE1679 - gives a possibility for more energy savings •

If UE is already configured to use DRX Cycles when MG is being established, eNB will ensure a dedicated DRX configuration for the UE for the time when MG are setup

•

Usage of DRX in parallel with MGs gives an opportunity to achieve longer battery lifetime when compared to continuous PDCCH monitoring (when LTE1679 is not activated)

 Abbreviated name LNCEL:actDrxDuringMeasGap

Full name  Activate DRX during measurement gap

Note that: •

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LTE1679 can be activated together with LTE42/LTE473 only (LNCEL:actDrx = true) or when LTE 585 SMART DRX is used as well (LNCEL:actSmartDrx = true) 31/07/2018

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Technical Details DRX and Measurements Gaps Before FL15A/TL15A, during inter-frequency and inter-RAT measurements with MG, DRX had to be disabled • When Measurement Gap (MG) pattern was being configured for UE, DRX was being released (UE was configured with DRX Profile 1 until measurements are done)

From FL/TL15A onwards, there is an opportunity to activate DRX with parallel UE measurement gaps (LNCEL:actDrxDuringMeasGap ) • LTE1679 does not support DRX with CS Fallback MG, (CSFB MG) which is needed for CS Fallback via PS HO • Once CSFB MG is being set up, DRX Profile 1 will be sent to UE, regardless of LTE1679 activation status 28

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drxProfile1

• drxProfileIndex =1 • drxProfilePrority = 45

DRX OFF 

From FL15A/TL15A it is possible to use DRX with non-CSFB MG

Technical Details DRX and Measurements Gaps When LTE1679 is activated (LNCEL:actDrxDuringMeasGap is set to true), UE for which MG pattern is configured is still able to work with DRX, provided that non-CSFB MG is established •

If UE was using any of regular DRX Profiles before MG need (DRX Profile 2 – DRX Profile 5) then DRX Profile 2 will be used for given UE for the time while MG are set up

•

If UE was using any of Smart DRX Profiles before MG need, Smart DRX Profile 2 will be used for given UE for the time while MG are set up

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If UE was configured not to use DRX before MG need (DRX Profile 1), DRX Profile will not be changed with MG setup

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Only DRX Profile 1, DRX Profile 2 and Smart DRX Profile 2 are allowed when MG are set up

Technical Details DRX and Measurements Gaps Measurement Gap allocation • When LTE1679 is activated, eNB ensures that both SR(Scheduling Request) as well as DRX On Duration are not fully overlapped with MG -

-

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It usually results in MG offset equal to -7 TTIs in reference to DRX Cycle start •

MG is intended to be placed during plausible DRX Sleep time. This will reduce impact of LTE1679 on DL transmission as during DRX Sleep time, DL transmission is not expected anyway

•

eNB ensures that SR is not overlapped with MG as well thus additional impact of LTE1679 on UL should be negligible

When it is not possible to find a MG offset that will not overlap with DRX On Duration, it is allocated in a way that overlapping is minimized

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DRX Cycle

DRX Cycle

SR

Technical Details_DRX

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Technical Details_DRX

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qrxlevmin Need to Change to -124 dBm We Need to change the qrxlevmin value .

qrxlevmin: Specifies the minimum required RX RSRP level in the cell.

Current value is -120 , Proposed Value : -124dBm

Note: This proposed setting will allow UE to latch on the network at respected level.

The Current value to sacrificing few UEs which can access the Network. 33

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Cells having High UL RSSI for PUSCH Please find the cells which having high UL RSSI . There are many cells which having poor UL RSSI. Below are the cells which should be on top priority to resolve this issue. Average of Avg RSSI for PUSCH Row Labels 03-08-2017 04-08-2017 05-08-2017 06-08-2017 HIRE_L8-3 -94.18785925 -88.89625681 -91.74855642 -93.04724103  ANYAMA_BELLEVILLE_L23 -3 -94.20405357 -96.01281404 BARDO_L8-3 -88.03333559 -91.93832873 -90.16159154 DUEKOUE_L8-1 -97.04559544 -94.14943082 -95.4713983 -91.17152565  AGNIKRO_L8-3 -96.1964877 -95.99852334 -93.56563637 -95.63184378 PLAQUE_MARCHE_23-1 -94.99867416 -95.6385378 -94.70245084 -94.61740005  ATLANTIC_L8-2 -96.52944912 -96.0995387 -96.19080254 -93.45567588 ISSIA_KOKO_L8-3 -95.95968826 -95.00424274 -93.18683343 KANGANDI_L8-2 -95.80738734 -96.4897909 -95.26469483 -93.55661427 HONDE_L8-2 -96.22564144 -94.92195532 -95.36121618 -95.09464051 OFF_BANCO_L23-1 -95.29832133 -93.98288702 -96.82426722 -94.64446743  AGNEBY_L8-1 -94.98847102 -93.74288172 -95.00296747 -95.48946453 CAFOP_L8-2 -94.38533885 -94.60478112 -93.27291001 -97.88033695  AERIA_L8-3 -96.39891813 -95.18328478 -95.27116013 -96.02098227 DJIDOUBAYE_L8-1 -95.78481862 -97.35158789 -94.1995835 -95.76519164 BASILIQUE_L8-2 -96.95887681 -94.77268605 -95.84156653 DOUE_L8-3 -95.79757852 -96.10676223 -94.05323198 MEAGUI_NETRO_L8-3 -94.97022718 -94.64954849 NEVADAV_L8-3 -95.79361173 -96.56396433 -91.31377994 -95.88620726 UTEXI_L8-2 -95.72371171 -95.91616661 -96.90817679 -93.92185665 NOGBOLO_L8-3 -97.76630619 -93.54336464 -96.1153941 DUEKOUE_RESIDENTIEL_  L8-3 -95.83378026 -94.77628859 -95.87605495 -96.14553606 FAMA_L8-3 -94.21104281 -94.99008957 -95.92561397 BUYO_PLATO_L8-2 -96.04764264 -95.23462393 -94.76101347 CCT_L26-2 -95.33922952 -95.65075787 -95.91571568 PALETUVIER_L8-1 -96.4786114 -96.58503809 -96.71416147 -95.44284133 DUEKOUE_KERE_L8-1 -94.45914281 -97.55144842 -95.87549131 34 31/07/2018 © Nokia 2014 - F ile Name - Version - Creator - DocID94 47228127 COSAV L26 2 97 64958425

07-08-2017 -83.45037221

08-08-2017 -86.68726296

09-08-2017 -91.60604628

 Avg RSSI -89.94622785

-96.90902723 -87.71065858 -94.11403661 -90.38244893 -97.41045927 -90.87178456 -97.37207348 -95.72554392 -94.88847678 -93.83583333 -96.79308433 -97.99739926 -95.39489116 -96.01208217 -93.54067051 -96.91693589 -95.91970939

-87.0423559 -96.85743861 -93.68256703 -95.15590635 -93.00733361 -96.44385147 -92.70931141 -95.03423989 -95.06400967 -95.45377065 -95.77057087

-80 -93.97215016 -94.36941393

-95.39086457 -97.80324614 -97.43713611 -94.40503583 -96.18965549 -97.92567412 -95.45480669 -95.47049731

-95.98321804 -92.85624169 -97.11141274 -97.13928481 -97.24327074 -96.95450471 -96.17873099

-90.83365015 -91.44558387 -94.28628111 -94.48847441 -94.72069328 -94.77711154 -94.90260829 -94.9029157 -95.27023084 -95.37223564 -95.58165243 -95.62815324 -95.6633313 -95.68182166 -95.7101872 -95.7318262 -95.77368507 -95.78775135 -95.80993448 -95.81485865

-95.93823361 -97.44536407 -97.05810157 -97.59938394 -95.20090118 -95.80248034 96 07091919

-95.95561744 -96.53755301 -95.91731464 -95.08700562 -95.64172822 -96.93838853 97 81826767

-95.81926257 -95.82193269 -95.9306934 -95.94607203 -95.99200932 -96.01548578 96 12365082

-95.7903182

-96.2093271 -96.56546415 -96.08433954 -95.88078358 -95.46596324 94 6072017

-92.66999726 -93.84867849 -95.1835004 -92.44213875 -95.33567599 -97.56610252 -97.28412705