Huawei Sharing Sessionn KPI_250111

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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www.huawei.com

HUAWEI NPI Sharing Season

HUAWEI RNP

January 2011


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Analyze and Improve KPI CS (Voice) Analyze and Improve KPI PS (Data) Identify and Analyze HW Problem How to using LMT/M2000 for change

parameter, query, etc





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In a live network maintain and optimization are regular activities that need to do to keep network in good performance.

SDSR, HOSR, TDR as KPI Voice and TBF SR, GPRS/EDGE DL Throughput as KPI Data are Key Performance Index in this NPI

Our sharing session will describe what we have done in this NPI to improve KPI CS and PS, Analyze HW Problem symptoms and How to use M2000 and LMT for parameter change and query data.





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After this Sharing Session, we share and know: What we have done to analyze and improve KPI CS and PS Familiar how to identify Hardware problem from TRX

Measurement Result Familiar to use M2000 and LMT for data collection and parameter

change





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SDSR HOSR TDR





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Analyze and Improve SDSR

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1.Check AlarmMost likely sudden degradation SDSR due to alarm occurrence such as LAPD Alarm, Radio Link Prompt Alarm, LAPD Link Congestion due to flicker Transmission Alarm, etc.

2.Check SD Blocking . If blocking :• Check if continue or spike. If spike check availability of cell (alarm) or neighbors site

availability.• If continue check parameter idle mode such as RXLEV_ACCESS_MIN and CRO (2db). If

not proper adjust to proper parameter such as CRO (2dB) for GSM shall be 0 and DCS default by 13.

• If no cell out of service and already standard parameter and no missing neighbors, check if still can tune parameter (If DCS blocking reduce CRO (2dB) for DCS or if GSM blocking increase CRO (2dB) for DCS) otherwise add SDCCH channel.

3.Check Frequency Bad SDSR due to frequency most likely will have steady value until there is change in BCCH. Checking base on Map is most suitable ways. Co-channel and Adjacent Cell head to head must be avoid and tune if any. Retune BCCH is one of most effective to improve SDSR in cluster level.

4.Check CoverageCoverage must be maintain to have good SDSR since excessive coverage (overshoot) will cause interference and low downlink / uplink level. We can check coverage by CTRx counter (TA Measurement) and check on map. Downtilt is solution for this case but shifting some SDCCH from Hopping TRx to BCCH TRx can help SDSR since avoid “hit” on hopping channel if BCCH more clear. Add T200 help also to increase delay for SD Channel request due to low signal strength.





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1. Check Alarm. Most likely sudden bad SDSR due to alarm occurrence such LAPD Alarm, Radio Link Prompt Alarm, LAPD Link Congestion due to flicker Transmission Alarm, etc.





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2. Check SD Blocking . If blocking :• Check if continue or spike. If spike check availability of cell (alarm) or neighbors site availability.• If continue check parameter idle mode such as RXLEV_ACCESS_MIN and CRO (2db). If not proper

adjust to proper parameter such as CRO (2dB) for GSM shall be 0 and DCS default by 13.• If no cell out of service and already standard parameter and no missing neighbors, check if still can

tune parameter (If DCS blocking reduce CRO (2dB) for DCS or if GSM blocking increase CRO (2dB) for DCS) otherwise add SDCCH channel.





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3. Check Frequency Bad SDSR due to frequency most likely will have steady value until there is change in BCCH. Checking base on Map is most suitable ways. Co-channel and Adjacent Cell head to head must be avoid and tune if any. Retune BCCH is one of most effective to improve SDSR in cluster level.





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4. Check CoverageCoverage must be maintain to have good SDSR since excessive coverage (overshoot) will cause interference and low downlink / uplink level. We can check coverage by CTRx counter (TA Measurement) and check on map. Downtilt is solution for this case but shifting some SDCCH from Hopping TRx to BCCH TRx can help SDSR since avoid “hit” on hopping channel if BCCH more clear.

TA BEFORE

TA AFTER





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LAC MergeSome case if number of LAC in current network can be reduce thus can decrease SD Load since Location Update due to cross border will reduce also improve SDSR in area with. We do LAC Merging in our NPI period also base on Total Paging Load in some LAC that will be merge.Sample : BSC Margorejo (4677 – 4758





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Analyze and Improve HOSR

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1. Check Alarm and Hardware Spike degradation on HOSR can be happen due to alarm occurrence such Cell Out of Service Alarm due to Hardware Alarm of neighbors site. Hardware problem without alarm also can degrade HOSR since to fast Handover occur due to poor signal strength caused by hardware problem.

2. Check Neighbor RelationCheck missing neighbors or not proper neighbors (not needed).Define which relation that having bad success ratio. Check target cell that having bad success rate from all incoming, If all incoming have bad success rate check alarm and hardware problem, if not check parameter per relation adjacent and modify.

3. Check Db Internal and External Cell Check database especially external adjacent to make sure database created in external adjacent is updated with current database (BCCH, BSIC, LAC)

4. Check Handover Parameter ThresholdThreshold parameter can be set depends on network situation. If set to high can cause unnecessary HO but if set too low can have late HO and call may be drop. Some case we render more hard to attempt HO to reduce HO fail in network by Increase Inter cell HO Hysteresis, Min Access Level Offset, PBGT HO Threshold for same layer or Increase Adjacent Cell Inter Layer for different layer.





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NPI Project

Analyze and Improve HOSR16-bit queuing





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NPI Project

Analyze and Improve HOSRHO Reason Algorithm





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NPI Project






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NPI Project






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NPI Project






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NPI Project






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NPI Project






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Analyze and Improve HOSRNPI Project

Min UP Power on HO Candidate Cell : The M criterion supports the minimum value constraint of uplink receive level of the adjacent cell. Expected uplink level of the adjacent cell >= (Min UP Power on HO Candidate Cell + Min Access Level Offset)The M criterion is met if the Filtered downlink level of the adjacent cell >= (Min DL Power on HO Candidate Cell + Min Access Level Offset); otherwise, the M criterion is not met.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm). Min DL level on Candidate Cell : This parameter specifies the minimum downlink receive level of a neighbor cell. Expected downlink level of the neighbor cell >= (Minimum downlink power of the candidate cell for handover + Minimum access level offset)The M criterion is met if the Expected uplink level of the neighbor cell >= (Minimum uplink power of the candidate cell for handover + Minimum access level offset); otherwise, the M criterion is not met

DL / UL Qual. Threshold : This parameter specifies the downlink / uplink receive quality threshold of an emergency handover. An emergency handover is triggered when the downlink / uplink receive quality is greater than or equal to the DL / UL Qual. Threshold.When an emergency handover is triggered, an inter-cell handover should be preferentially selected. An intra-cell handover, however, is triggered if no candidate cell is available and if intra-cell handovers are allowed.





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NPI ProjectEdge HO DL RX_LEV Threshold : If the DL receive level remains lower than the Edge HO DL RX_LEV Threshold for a period, the edge handover is triggered. If the PBGT handover is enabled, the relevant edge handover threshold can be decreased. If the PBGT handover is not enabled and the edge handover threshold is not properly set, cross coverage, co-channel interference, and adjacent channel interference are likely to occur. The Edge HO DL RX_LEV Threshold should be adjusted based on the handover performance statistics and the actual network performance to achieve the UL/DL balance.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).

Edge HO UL RX_LEV Threshold : If the UL receive level remains lower than the Edge HO UL RX_LEV Threshold for a period, the edge handover is triggered. If the PBGT handover is enabled, the relevant edge handover threshold can be decreased. If the PBGT handover is not enabled and the edge handover threshold is not properly set, cross coverage, co-channel interference, and adjacent channel interference are likely to occur. The Edge HO UL RX_LEV Threshold should be adjusted based on the handover performance statistics and the actual network performance to achieve the UL/DL balance.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).






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NPI ProjectInter-layer HO Threshold : This parameter is used to determine the inter-layer in the 16 bits to sort the candidate cells for handovers.Inter-layer HO threshold of a serving cell = configured Inter-layer HO Threshold - Inter-layer HO HysteresisInter-layer HO Threshold of an adjacent cell = configured Inter-layer HO Threshold + Inter-layer HO Hysteresis of an adjacent cell - 64.

Inter-layer HO Hysteresis: This parameter specifies the hysteresis of an inter-layer or inter-priority handover. This parameter is used to avoid inter-layer ping-pong handovers. Actual Inter-layer HO Threshold of a serving cell = configured Inter-layer HO Threshold - Inter-layer HO HysteresisActual Inter-layer HO Threshold of an adjacent cell = configured Inter-layer HO Threshold + Inter-layer HO Hysteresis of an adjacent cell - 64.






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NPI ProjectAnalyze and Improve HOSR

Location of some handover parameters in Emergency HO Data





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Some parameters works depends on other setting such as Adjacent Cell Inter Layer HO Hysteresis on different layer





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Some handover parameters related in Handover data and Adjacent relation





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Case 1. (Parameter change)

Adjust Handover Parameter Threshold 9-10 Nov 2010





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Case 2. (Neighbors audit )

Audit neighbors (delete/add) can improve HOSR since best candidate can be choice





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Case 3.

Parameter Trial (Co-BSC/MSC) :Global Parameter Change from Yes to NoThis parameter specifies whether to adjust the sequence of candidate cells. After the sequence is adjusted, the handover within the same BSC/MSC takes priority. If this parameter is set to Yes, the target cell to which the MS is handed over may not be the cell with the best signal quality.





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Case 4. (Troubleshoot Hardware Problem on Juwana II-0)





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Case 5. (Poor Success Rate to one of some adjacent cells due to HW Problem)





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Analyze and Improve TDR

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1.Check Alarm / Hardware ProblemLike SDSR sudden degradation on TDR due to alarm occurrence such as Radio Link Prompt Alarm, Cell Out of Service, LAPD OML fault, etc. Some case alarm not occurred but hardware having problem

2.Check Frequency. Bad frequency planning causing high interference. This can be on BCCH TRx or on Hopping TRx. For BCCH TRx mainly on BCCH channel assigned and for Hopping TRx depends on Mal Id, HSN and MAIO assigned.

3.Check NeighborsNeighbors relation must be checked to guarantee continuity of mobile user. Wrong or missing adjacent relation lead to wrong handover scenario or causing call dragging and easy to occur drop call. Neighbors database check also needed especially for different BSC. Correction of missing neighbors will improve TDR also HOSR as well

4.Check CoverageSimilar with SDSR case, excessive TA distribution can increase drop call since interference happened and poor signal strength on uplink or downlink easy to have more drop call. Tilting the cell to have more proper coverage will improve TDR, addition adjacent to overshoot area sometimes help TDR but not always improve. Sometimes need to check RxLevelAccessMin to be proper not too small value and CRO (2dB) not too high value

5.Reduce blocking on TCHBlocking on TCH can degrade TDR in a network since TCH can not be accessed especially for handover case. Blocking when handover occurred can cause call dragging and lead to increment of drop call. This TCH Blocking can be reduce by traffic sharing, increase HR portion, Lower PDTCH ratio.





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Sample 1. Alarm Occurrence Impact to TDR





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Sample 2. (Troubleshoot Hardware Problem without alarm occurrence)





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Sample 3. (Retune BCCH)





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Sample 4. (Tilting)





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Sample 5. (Reduce Blocking by Traffic Sharing to DCS)





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TBF Completion Success Rate GPRS DL Throughput EDGE DL Throughput





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Improvement TBF Completion SR

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1. Release Delay of Downlink TBF(ms)This parameter specifies the release delay of the downlink TBF. After sending the last downlink RLC data block and confirming that all downlink data blocks are received,

the network does not immediately notify the MS of releasing this TBF but forcedly set the last data block not received. Therefore, keep this TBF unreleased by continuously resending the last downlink data block with the Relative Reserved Block Period (RRBP) flag.

If this parameter is set to a higher value, this wastes the wireless resources and influences the the access performance of other MSs in the network, thus causing the useless signaling seizing the channel bandwidth and wasting the downlink resources.

2. Inactive Period of Extended Uplink TBF(ms)This parameter specifies the inactive period of the extended uplink TBF. Upon receiving the last uplink RLC data blocks (CountValue=0) from the MS that supports the extended

uplink TBF function, the network does not release this uplink TBF immediately but set it to the inactive mode

If this parameter is set to a higher value, the release delay of the uplink TBF increases, thus wasting the uplink

resources.3. Support 11BIT EGPRS AccessThis parameter specifies whether the 11-bit EGPRS access is supported.Yes: supportedNo: not supported

Global Change Parameter

No Condition Parameter Name Before After 1 All Cell Release Delay of Downlink TBF(ms) 2400 10002 All Cell Inactive Period of Extended Uplink TBF(ms) 2400 10003 All Cell Support 11BIT EGPRS Access Yes No





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Global Change Parameter

Parameter change in “PS Network Optimization Parameters” on “GPRS Attributes”





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Result of Global Change Parameter

9494.595

95.596

96.597

97.598

98.5

9/1/20

109/3/20

109/5/20

109/7/20

109/9/20

109/11

/201

09/13

/201

09/15

/201

09/17

/201

09/19

/201

09/21

/201

09/23

/201

09/25

/201

09/27

/201

09/29

/201

010

/1/201

010

/3/201

010

/5/201

010

/7/201

010

/9/201

010

/11/20

1010

/13/20

1010

/15/20

1010

/17/20

1010

/19/20

1010

/21/20

1010

/23/20

1010

/25/20

10

TBF Completion Success Rate

2G-Kudus 2G-Purwokerto 2G-Yogyakarta

1

1. Applied in 2 BSC Pilot in Cluster Yogyakarta at 30th September 2010 night time2. Applied in All BSC in NPI Cluster at 5th October 2010 night time

2





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Improvement GPRS DL Throughput

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In this NPI Project, we follow PDTCH Dimensioning as follow :

PDTCH Re-Dimensioning

Configuration Rules: If TRX<=4, PDTCH channel to

BCCH TRX. If 8=>TRX>4, 4 PDTCH in

BCCH TRX, and left should be configure to 1st TRX on 2nd GRFU / DRFU Board.

If TRX>8, configure 4 PDCH in BCCH TRX, 4 in 1st TRX of 2nd Board and left should be configured to 1st TRX of 3rd Board. (Avoid malfunction of DRFU)

TRX/Sector Combine EDGE & GPRS-Tsel RNP(Static PDCH Configuration Numbers)

1 2

2 2

3 3

4 4

5 6

6 7

7 7

8 8

9 10

10 11

11 12

12 13





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PDTCH Re-Dimensioning





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Result of PDTCH Re-Dimensioning

0102030405060708090

9/2/

2010

9/3/

2010

9/4/

2010

9/5/

2010

9/6/

2010

9/7/

2010

9/8/

2010

9/9/

2010

9/10

/201

09/

11/2

010

9/12

/201

09/

13/2

010

9/14

/201

09/

15/2

010

9/16

/201

09/

17/2

010

9/18

/201

09/

19/2

010

9/20

/201

09/

21/2

010

9/22

/201

09/

23/2

010

9/24

/201

09/

25/2

010

9/26

/201

09/

27/2

010

9/28

/201

09/

29/2

010

9/30

/201

010

/1/2

010

10/2

/201

010

/3/2

010

10/4

/201

010

/5/2

010

GPRS DL Throughput


1 2

1. Applied in BSC under Cluster Yogyakarta at 27th September 2010 night time2. Applied in BSC under Cluster Kudus and Purwokerto at 28th September 2010 night time





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Improvement EDGE DL Throughput

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1. PDTCH Re-Dimensioning2. Additional Idle Time SlotAddition Idle Time Slot for Site with :1. Limited by current E1 installed 2. Calculation Idle Time Slot can be configured with :

a. Multiplexed Mode usedb. Number of TRx installedc. Number of TCH+PDTCH Channeld. Number of BCCH and SDCCHe. Maximum Ratio Threshold of PDCHs

Coding Scheme User Data rate (Kbit/s)

Main TS 16KbpsPDTCH

Additional Idle TS 16Kbps TS 16Kbps

CS-1 9.05 1 0 1CS-2 13.4 1 0 1CS-3 15.6 1 1 2CS-4 21.4 1 1 2MCS-1 8.8 1 0 1MCS-2 11.2 1 0 1MCS-3 14.8 1 1 2MCS-4 17.6 1 1 2MCS-5 22.4 1 1 2MCS-6 29.6 1 1 2MCS-7 44.8 1 2 3MCS-8 54.4 1 3 4MCS-9 59.2 1 3 4





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1. PDTCH Re-Dimensioning2. Additional Idle Time Slot

Example with current E1:Site : Banyusoco (3 Sector, 1 E1, Multiplexed Mode (2:1), #TRx = 9,

#BCCH = 3, #SDCCH = 7, Maximum Ratio Threshold of PDCHs = 30%.From this information we can calculate number of TCH + PDTCH Channel

(A)A = 9 (TRx) * 8 (Tsl) – 3 (BCCH) – 7 (SDCCH) = 62 ChannelTS for RSL = Roundup (9 (TRx) / 2 (Multiplex mode))

= 5 (64 Kbps)Idle Time Slot can be configured = 1*128 (E1) – 62 (TCH+PDCH) – 5*4

(RSL)- 4*1 E1 (OML) – 4 (buffered)

= 38 Idle time slot (16 Kbps)Example with Maximum Ratio Threshold of PDCHsFrom information PDCHs maximum will be = rounddown (30% * 62

Channel) = 18 Channel

Idle Time Slot needed with this config = 18 * 3 (Idle Time Slot in ABIS to get high

MCS (8/9)) = 54 Idle time slot (16 Kbps)

E1 required = (62 (TCH + PDCH) + 5*4 (RSL) + 54 (Idle TS) + 4 (OML) )/ 124 (E1

– 4 buffered) = 1.13 (Need 2 E1 / Add 1 E1 from current).





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1. PDTCH Re-Dimensioning2. Additional Idle Time Slot





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1. PDTCH Re-Dimensioning2. Result Additional Idle Time Slot

020406080

100120140160180200

9/2/

2010

9/3/

2010

9/4/

2010

9/5/

2010

9/6/

2010

9/7/

2010

9/8/

2010

9/9/

2010

9/10

/201

09/

11/2

010

9/12

/201

09/

13/2

010

9/14

/201

09/

15/2

010

9/16

/201

09/

17/2

010

9/18

/201

09/

19/2

010

9/20

/201

09/

21/2

010

9/22

/201

09/

23/2

010

9/24

/201

09/

25/2

010

9/26

/201

09/

27/2

010

9/28

/201

09/

29/2

010

9/30

/201

010

/1/2

010

10/2

/201

010

/3/2

010

10/4

/201

010

/5/2

010

10/6

/201

010

/7/2

010

10/8

/201

010

/9/2

010

10/1

0/20

1010

/11/

2010

10/1

2/20

1010

/13/

2010

10/1

4/20

1010

/15/

2010

10/1

6/20

1010

/17/

2010

10/1

8/20

1010

/19/

2010

10/2

0/20

10

EDGE DL Throughput


1 2

1. Applied in BSC Teluk2 and Kerteg under Cluster Purwokerto at 6th October 2010 night time

2. Applied in BSC Teluk1 and Purwonegoro under Cluster Purwokerto at 7th September 2010 night time





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THANK YOU!

Documents

Huawei Sharing Sessionn KPI_250111