S01M05 5 Handover Indicators

Do not delete this graphic elements in here: Section 1 B11 GSM QoS Monitoring Module 5 Handover Indicators 3JK12195AAAAWBZZA Issue 1 GSM B11 BSS B11 GSM Quality of Service & Traffic Load Monitoring TMO18096 D0 SG DEN I1.0 Issue 1 All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 1 Blank Page 1·5·2 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 This page is left blank intentionally Document History Edition 01 Date YYYY-MM-DD Author Last name, first name Remarks First edition All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 2 Module Objectives Upon completion of this module, you should be able to: ƒ Explain what are the main Handover counters and indicators provided by the Alcatel-Lucent BSS in order to monitor the quality of handovers 1·5·3 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 3 ] 1·5·4 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 This page is left blank intentionally All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 4 .Module Objectives [cont. Radio Failure Incoming External HO .Failures Incoming Internal HO .Radio Failure with ROC Failure .Indicators All Rights Reserved © Alcatel-Lucent 2010 1 · 5 · 5 Intra-Cell HO / Internal HO .Success External HO .Exercise 5 Handovers QoS per Adjacency Type 180 Counters Type 180 Indicators Type 26: TCH outgoing handover per adjacency Type 27: 2G TCH incoming handover per adjacency Type 27 Indicators 6 Inter-PLMN and Inter-RAT Inter-PLMN HO Description Inter-PLMN Indicators 2G-3G Indicators 7 Key Performance Indicators Handover Cause Distribution Handover Standard Cause Distribution Handover Cause Distribution Outgoing Handover Success Rate Incoming Handover Success Rate Page 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 50 51 52 53 54 55 56 57 58 59 60 61 62 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 5 .Radio Failure Incoming Internal HO .Counters Outgoing Internal HO .Indicators Outgoing Internal HO .Failures Outgoing External HO .Radio Failure with Drop Failure – Other Drops "BSS" Main Counters 3 Internal Intercell Handovers Internal HO – Success (Async) HO COMMAND message Incoming Internal HO .Congestion Failure .Radio Failure Drop Outgoing Internal HO .Failures Incoming External HO .Radio Failure with ROC Outgoing External HO .Table of Contents Switch to notes view! 1 Handovers Overview Description Types 2 Intra-Cell Handovers Intracell HO .Congestion Incoming External HO – TTCH (CIC) Congestion Incoming External HO .Radio Failure Drop Outgoing External HO .Congestion Incoming Internal HO .Indicators Outgoing External HO .Counters Incoming External HO .Failures Outgoing Internal HO .Counters Outgoing External HO .Indicators External HO .Radio Failure ROC Outgoing Internal HO .Counters Incoming Internal HO .Success Failure Causes Failure .Exercise B11 GSM QoS Monitoring · Handover Indicators GSM B11 BSS B11 GSM Quality of Service & Traffic Load Monitoring 4· External Intercell Handovers External HO . ] Switch to notes view! Handover Failure Main Causes Page 63 1·5·6 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 6 .Table of Contents [cont. 1 Handovers Overview 1·5·7 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 7 . 1 Handovers Overview Description z Handovers are detected & prepared by the BSC ƒ Algorithms are checked ƒ Radio resources are allocated z MS moves from 1 TCH in the Serving Cell to 1 TCH in the Target Cell BTS BSC 1 2 Radiolink Measurements Active Channel Preprocessing HO Detection Candidate Cell Evaluation HO Preparation HO Execution CELL (S) CELL (T) 3 4 channel activation handover command 5 6 1·5·8 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 note: Handovers are not only from TCH to TCH: HO SDCCH to SDCCH (SDCCH HO) HO SDCCH to TCH (=directed retry) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 8 . a call drop will occur Emergency Better Cell The Target cell is better than the Serving cell 1·5·9 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 9 .1 Handovers Overview Types New TCH is in another TRX of the current cell Intracell Intercell New TCH is in another cell Serving and Target cells belong to the same BSC (intra-BSC) Point of view from the target cell Internal External Serving and Target cells belong to different BSCs (inter-BSC) Point of view from the serving cell Incoming Outgoing Seving and Target cells are synchronized Synchronous Async. Serving and Target cells are not synchronized If the MS doesn't leave the current channel. 2 Intra-Cell Handovers 1 · 5 · 10 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 10 . Success MS Cell BSC (detection of intracell HO) MC870 Physical Context Request Physical Context Confirm Channel Activation (new ch) Channel Act. The BSC will send “BSC Shared DTM INFO Indication” to inform the MFS the successful end of the procedure if the conditions below are fulfilled: z z EN_DTM = enabled The MS is DTM capable by default : T3107 = 14sec All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 11 . Ack (new ch) Assignment Command MC871 T3107 T9103 *TC* MSC T9108 Assign Command SABM (new ch) UA (new ch) Assign Complete (new ch) Establish Indication (new ch) Assign Complete MC662 Handover Performed BSC Shared DTM Info Indication only for DTM-capable MS RF Channel Release RF Channel Release Ack 1 · 5 · 11 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 MFS Both SDCCH and TCH are counted together. The default value for T3107 is 14 seconds. The T3107 timer is also used as the guard timer of the channel change procedure during an intra cell handover.2 Intra-Cell Handovers Intracell HO . 2 Intra-Cell Handovers Failure Causes z Handover Preparation: ƒ Congestion ƒ Preparatio Failure HO_Cell_cong HO_Cell_prep_fail * z Handover Execution: ƒ Reversion to old channel ƒ Drop radio ƒ Drop due to BSS problem HO_Cell_ROC HO_Cell_drop_radio HO_Cell_drop_BSS * (*) No specific counter 1 · 5 · 12 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 12 . 1M B1 R2 • In IP mode.the cell mapped on a BTS is in IP congestion status.Congestion MS Measurement Report Cell Measurement Result (detection of intracell HO) MC870 (no free channel) MC561 TCH MC101 / SDCCH BSC B11 MC561: • In MX BSC.or the TCH processing capacity of AbisBTSGroup reaches the limit defined by the NB_MAX_ACTIVE_TCH_TS parameter 1 · 5 · 13 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 From B7. In this case. MC926 is also incremented by one. this counter is incremented whenever an intra-cell TCH handover cannot be performed due to the TCH processing capacity of CCP reaches the limit defined by the MAX_TCH_PER_CCP parameter. As the counting of the Abis-TCH congestion case was in restriction in B8: MC61(B6) = MC561(B7) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 13 . MC561 replaces MC61 (B6). .2 Intra-Cell Handovers Failure . this counter is increased by 1 if: . It is also possible the MS immediately sends an Assign Failure (without even attempting to connect to the new channel).Radio Failure with ROC MS Assign Command (old) T200_TF try N200_TTF times 200ms X 200ms X SABM (new) UA (new) SABM (new) UA (new) SABM (new) UA (new) etc etc etc Assign Failure (old) Assign Failure Physical Context Request (new) Physical Context Confirm (new) RF Channel Release (new) RF Channel Release Ack (new) 1 · 5 · 14 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Cell Assignment Command Establish Indication BSC MC871 T3107 X MC667 stop In this example. path unbalance …). N200_TTF = 34 T200_TF = 200ms 200 * 35 = 7seconds MC667 = C107 (sdcch intracell ho fail roc) + C67 (tch intracell ho fail roc) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 14 . the Downlink path on the new channel is faulty (interference.2 Intra-Cell Handovers Failure . 2 Intra-Cell Handovers Failure .Radio Failure with Drop MS Assign Command (old) Cell Assignment Command BSC ? MC871 T3107 ? Channel release of old and new channels MC663 1 · 5 · 15 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 MC663 = C103 (sdcch) + C63 (tch) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 15 . HO_Cell_ROC z Another counter is linked to various causes of drops during HO preparation and execution phases: MC14a (Call_drop_HO_Prep_Exec_BSS_failure) is incremented when : ƒ TCH Channel Activation is acknowledged negatively ƒ Channel Activation procedure (T9103) expires ƒ LapD failure.2 Intra-Cell Handovers Failure – Other Drops "BSS" z Based on missing successes: HO_Cell_drop_BSS = HO_Cell_allocated .HO_Cell_drop_radio .058 ERROR REPORT message with a cause value of "O&M intervention" or "message sequence error" is received on Abis interface from either the serving or the target cell ƒ 48. or Abis failure. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 16 . or BSC boards failure ƒ 48.HO_Cell_success .058 CONNECTION FAILURE INDICATION message with a cause value of "remote transcoder failure" during the Channel Activation procedure 1 · 5 · 16 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Intra cell HO failures due to BSS problems are deduced from other counters. 2 Intra-Cell Handovers Main Counters z HO FAIL. CASES > intracell HO counters REQUEST ATTEMPT Preparation Failure SUCCESS INTRACELL Handover Preparation Request Congestion BSS Pb MC870 Execution Failure CONGESTION BSS PB MC561+MC101 MC870-MC871-(MC561+MC101) MC871 REVERSION OLD CHANNEL Execution Attempt Reversion old channel MC667 Drop radio MC663 BSS Pb MC871-MC662-MC667-MC663 Success 1 · 5 · 17 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring DROP RADIO DROP BSS MC662 All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 17 . 3 Internal Intercell Handovers 1 · 5 · 18 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 18 . so that the MS will use this timing advance in the target cell. The MFS in the old cell deletes the MS context and creates an MS context according to the information received in the BSCGP BSC shared DTM info indication. if DTM is enabled in the new cell. it send a BSCGP BSC shared DTM info indication (CS_flag = 1) to the MFS. it sends a BSCGP BSC shared DTM info indication (CS_Flag = 0) to the MFS. In case of Sync HO. then the HO COMMAND indicates that the HO is async. the HO COMMAND contains a valid timing advance value. z z if DTM is enabled in the old cell. If the HO is not sync. The target BTS will need to compute the TA. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 19 . Ack (new ch) (opt) TFO Modification Req HO Command HO Access * 4 HO Detection SABM (new ch) UA (new ch) Assign Complete (new ch) Handover Complete MC656 MC652 Establish Indication MC660 MC871 T3103 TCH speech (old channel release) Handover Performed BSC Shared DTM Info Indication only for DTM-capable MS MFS 1 · 5 · 19 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 MC830=C230 (tch) + C330 (sdcch) After the HO PERFORMED is sent to the MSC. and the MS will send the HO ACCESS with TA=0.3 Internal Intercell Handovers Internal HO – Success (Async) MS Serving Cell Target Cell BSC (detection of intercell HO) MC655a MC830 T9103 MSC TCH speech Channel Activation (new ch) Channel Act. etc. NCC TCH Frequency (or Frequency Hopping MA List. BCC. MAIO. HSN.) TS Number Ciphering Speech Codec (only for phase 2 MS) Timing Advance information (if Sync HO) TCH HO Command Serving Cell 1 · 5 · 20 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 20 .3 Internal Intercell Handovers HO COMMAND message z The TCH in the Target cell is fully described in the HO Command ƒ ƒ ƒ ƒ ƒ ƒ BCCH. outgoing indicators) y BSS problem (no specific counter) 1 · 5 · 21 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 21 .3 Internal Intercell Handovers Incoming Internal HO .Failures z Causes of Failures : ƒ Handover procedure from the target cell point of view ƒ Handover Preparation: y Congestion: no RTCH available in the target cell y "Other" problem (no specific counter) ƒ Handover Execution: y Radio problem: the MS fails to access the new channel { which can lead to a "drop" or a "reversion to old channel" (cf. 3 Internal Intercell Handovers Incoming Internal HO . As the counting of the Abis-TCH congestion case was in restriction in B8: MC51(B6) = MC551(B7) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 22 . MC551 replaces MC51of B6.Congestion MS Serving Cell Serving BSC MSC MEAS REPORT -----------------------------> MEASUREMENT RESULT --------------------------------------------------------------> MC830 No free TCH MC551 1 · 5 · 22 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 From B7. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 23 .stop T3105 HANDOVER COMPLETE ----------------------------------------------------..-X MS serving cell target cell BSC SABM MEAS REP -----------------------> ESTABLISH INDICATION MEASUREMENT RESULT UA ------------------------------------------------------------------------> -----------------------> ------------------------------------------------------------------------> <----------------------CHANNEL ACTIVATION HO FAILURE HANDOVER FAILURE <--------------------------------------------------------> ------------------------------------------------------------------------> MC653 CHANNEL ACTIV ACK Release of new channel ----------------------------------> MSC HO CMD HANDOVER COMMAND <----------------------...start T3103 MC660 SABM -----------x T3103 expiry MC653 1 · 5 · 23 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All incoming internal HO failures due to radio problems are counted in the same counter MC653.start T3105 SABM -------------------------------------------------------------> ESTABLISH INDICATION UA ----------------------------------> <------------------------------------------------------------.Radio Failure z MS MS access problem Serving cell Target Cell BSC HO CMD HANDOVER COMMAND <----------------------.<-----------------------------------------------------------------------.start T3103 HANDOVER ACCESS MC660 -------------------------------------------------------------> -------------------------------------------------------------> HO DETECTION PHYSICAL INFORMATION ----------------------------------> <------------------------------------------------------------.<-----------------------------------------------------------------------.3 Internal Intercell Handovers Incoming Internal HO . Both radio failures with Reversion Old Channel and radio drop are counted together. Counters REQUEST ATTEMPT Preparation Failure SUCCESS INCOMING INTERNAL Handover Preparation Request Congestion BSS Pb Execution Attempt Radio (MS access problem) BSS Pb Success 1 · 5 · 24 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring Execution Failure CONGESTION BSS PB MC830 MC551+MC91 MC830-MC831-(MC551+MC91) MS ACCESS PB MC831 MC653 MC831-MC652-MC653 MC652 All Rights Reserved © Alcatel-Lucent 2010 BSS PB All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 24 .3 Internal Intercell Handovers Incoming Internal HO . Indicators HO_Inc_BSC_request HO_Inc_BSC_allocated HO_Inc_BSC_success HO_Inc_BSC_cong HO_Inc_BSC_fail_radio HO_Inc_BSC_prep_fail HO_Inc_BSC_fail_BSS 1 · 5 · 25 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS .3 Internal Intercell Handovers Incoming Internal HO .DEFINITION OF QUALITY OF SERVICE INDICATORS: Handover Statistics INDICATORS > Incoming handover > Incoming Intra BSC z z z z z GHOIBEFR: efficiency of the incoming internal HO execution GHOIBCGR: rate of incoming internal HO failures due to congestion GHOIBPFR: rate of incoming internal HO failures due to BSS during the preparation phase GHOIBFLRR: rate of incoming internal HO failures due to radio problems GHOIBFLBR: rate of incoming internal HO failures due to BSS during the execution phase All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 25 . 3 Internal Intercell Handovers Outgoing Internal HO .Failures z Cases of Failures: ƒ Handover procedure from the serving cell point of view ƒ Handover Preparation: y Preparation Failures (no details) ƒ Handover Execution: y radio problem: the MS reverts to the old channel y radio problem: the MS drops y BSS problem (no specific counter) 1 · 5 · 26 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 26 . Radio Failure ROC MS Serving cell Target Cell BSC HO CMD HANDOVER COMMAND <----------------------.-X SABM -----------------------> ESTABLISH INDICATION UA ------------------------------------------------------------------------> <----------------------HO FAILURE HANDOVER FAILURE -----------------------> ------------------------------------------------------------------------> MC657 Release of new channel 1 · 5 · 27 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 27 .start T3103 HANDOVER ACCESS MC660 -------------------------------------------------------------> -------------------------------------------------------------> HO DETECTION PHYSICAL INFORMATION ----------------------------------> <------------------------------------------------------------.3 Internal Intercell Handovers Outgoing Internal HO .<-----------------------------------------------------------------------.start T3105 SABM -------------------------------------------------------------> ESTABLISH INDICATION UA ----------------------------------> <------------------------------------------------------------..stop T3105 HANDOVER COMPLETE ----------------------------------------------------... <-----------------------------------------------------------------------.start T3103 MC660 SABM ----------x T3103 expiry MC658 Clear_request ------------------------> Clear_command <------------------------ Release of old and new TCH ƒ clear_request: ask the MSC to release the connection ƒ In case of call drop due to HO.3 Internal Intercell Handovers Outgoing Internal HO . the cause is "radio interface message failure" (for Alcatel-Lucent) 1 · 5 · 28 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 28 .Radio Failure Drop MS serving cell target cell BSC MSC MEAS REP -----------------------> MEASUREMENT RESULT ------------------------------------------------------------------------> MC655A CHANNEL ACTIVATION <---------------------------------CHAN ACTIV ACK ----------------------------------> HO CMD HANDOVER COMMAND <----------------------. 3 Internal Intercell Handovers Outgoing Internal HO . CASES > Outgoing internal HO counters REQUEST ATTEMPT Preparation Failure SUCCESS OUTGOING INTERNAL Handover Preparation Request Any preparation failure Execution Attempt Reversion old channel Drop radio BSS Pb Success 1 · 5 · 29 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring Execution Failure CONGESTION BSS PB MC655A MC655A-MC660 MC660 MC657 MC658 MC660-MC656-MC657-MC658 MC656 All Rights Reserved © Alcatel-Lucent 2010 REVERSION OLD CHANNEL DROP RADIO BSS PB All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 29 .Counters z HO FAIL. DEFINITION OF QUALITY OF SERVICE INDICATORS: Handover Statistics INDICATORS > Outgoing handover > Outgoing Intra BSC z z z z z GHOOBRQR: efficiency of the outgoing internal HO preparation GHOOBEFR: efficiency of the outgoing internal HO execution GHOOBOCR: rate of outgoing internal HO failures due to radio problems with Reversion Old Channel GHOOBCDRR: rate of outgoing internal HO failures due to radio problems with drop GHOOBCDR: rate of incoming internal HO failures with drop (radio + BSS) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 30 .3 Internal Intercell Handovers Outgoing Internal HO .Indicators HO_Out_BSC_request HO_Out_BSC_required HO_Out_BSC_prep_fail HO_Out_BSC_success HO_Out_BSC_ROC HO_Out_BSC_drop_radio HO_Out_BSC_drop_BSS 1 · 5 · 30 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS . 3 Internal Intercell Handovers Intra-Cell HO / Internal HO . find in the PAIB29.Exercise z With K1205.REC file: 1) One case of intra-cell failure with reversion 2) One case of Internal handover success y Identify the target cell y Identify the serving cell (in CR for call establishment) 3) One case of Internal handover failure with reversion 4) One case of Internal handover failure without reversion Time allowed: 15 minutes 1 · 5 · 31 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 31 . 4 External Intercell Handovers 1 · 5 · 32 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 32 . MC645A replaces MC645 of B6.SABM ------------------.HO_REQUIRED ----------> MC462A ----------CR (HO_REQUEST) -----> MC820 MC463A <--------.MEAS_REPORT -> ------. Note than all other (previous) counters related to HO continue to be based on Intra PLMN only. This is leading to a more accurate computation of the External outgoing HO success rate.Success MS serving_cell BSC MSC BSC target_cell MS .HO_COMPLETE --------------.HO_REQUEST_ACK -------.UA --------------> <-. 6 counters provide information for "Inter-PLMN HO" (Incoming and Outgoing) (From B8) z MC462a (equivalent of MC645A for intra PLMN external HO) Number of inter-PLMN TCH outgoing handovers or directed retry requests: HANDOVER REQUIRED sent to the MSC for an external TCH HO or an external DR triggered towards a cell belonging to a PLMN different from the PLMN of the serving cell. MC645a is only counting HANDOVER REQUIRED messages that are linked to a handover trial and not those that are linked to the update of the candidate cell list for handover / directed retry.CHANNEL_ACT_ACK------------<----. From B7.Start T9113 (HO_COMMAND) MC821 MC463B <-----. z MC462c (equivalent of MC646 for intra PLMN external HO) Number of inter-PLMN TCH outgoing handovers or directed retry successes: CLEAR COMMAND with Cause "Handover successful" received from the MSC for an external TCH HO or an external DR triggered towards a cell belonging to a PLMN different from the PLMN of the serving cell.HO_ACCESS ----<---.HO_COMPLETE ---------------------------------------<--.Stop T9113 MC642 MC463C 1 · 5 · 33 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Both SDCCH and TCH are counted together.HO_COMMAND -----------------------------------------------------MC650 Start T8 MC462B <---.MEAS_RESULT --------> MC645A -----.CLEAR_COMMAND -----MC646 Cause : HO_SUCCESSFUL Stop T8 <----------. Only Outgoing inter PLMN HO is allowed. z MC463a (equivalent of MC820 for intra PLMN external HO) Number of inter-PLMN TCH incoming handovers or directed retry requests: HANDOVER REQUEST received from the MSC for an external TCH HO or an external DR triggered towards the target cell from a serving cell belonging to a PLMN different from the PLMN of the target cell. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 33 .CC -----------------------. z MC463c (equivalent of MC642 for intra PLMN external HO) Number of inter-PLMN TCH incoming handovers or directed retry successes: HANDOVER COMPLETE received from the MS on Abis for an external TCH HO or an external DR triggered towards the target cell from a serving cell belonging to a PLMN different from the PLMN of the target cell. z MC463b (equivalent of MC821 for intra PLMN external HO) Number of inter-PLMN TCH incoming handovers or directed retry attempts: HANDOVER REQUEST ACK sent by the target BSC containing the HANDOVER COMMAND for an external TCH HO or an external DR triggered towards the target cell from a serving cell belonging to a PLMN different from the PLMN of the target cell.---.CHANNEL_ACTIVATION ------> <.4 External Intercell Handovers External HO .HO_ACCESS ------.PHYSICAL_INFO --> <--.ESTABLISH_INDICATION ---- MC462C Release of TCH <---.HO_DETECTION-------------- <------------------------.HO_DETECTION -------------- <----. z MC462b (equivalent of MC650 for intra PLMN external HO) Number of inter-PLMN TCH outgoing handovers or directed retry attempts: HANDOVER COMMAND sent to the MS on Abis for an external TCH HO or an external DR triggered towards a cell belonging to a PLMN different from the PLMN of the serving cell. from the target cell perspective (incoming): HO_Inc_MSC_request HO_Inc_MSC_allocated HO_Inc_MSC_cong HO_Inc_MSC_no_cic_alloc HO_Inc_MSC_prep_fail (deduced) HO_Inc_MSC_success HO_Inc_MSC_fail_radio HO_Inc_MSC_fail_BSS (deduced) 1 · 5 · 34 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 "deduced" : shows all the failures that were not counted by dedicated counters.Failures z Cases of Failures. by computing the missing successes. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 34 .4 External Intercell Handovers External HO . MEAS_RESULT --------> MC645A -----.HO_FAILURE --------------Cause: no radio resource available MC820 MC541A ( <-HO_REQUIRED_REJECT-) 1 · 5 · 35 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 In case of Mx-BSC.HO_REQUIRED -------> ----------CR (HO_REQUEST) -----> <----.4 External Intercell Handovers Incoming External HO .RTCH timeslot congestion .With Abis over IP (B11 MR3). the Congestion cases includes: . (note: TDM Abis congestion cannot be seen with this counter) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 35 .MEAS_REPORT -> ------.Congestion MS serving_cell BSC MSC BSC target_cell MS ."target" Mx-BSC CCP board capacity exceeded . when the Abis is congested. 4 External Intercell Handovers Incoming External HO – TTCH (CIC) Congestion MS serving_cell BSC MSC BSC target_cell MS .MEAS_RESULT --------> MC645A -----.MEAS_REPORT -> ------.HO_FAILURE --------------Cause: terrestrial circuit already allocated Requested terrestrial resource unaivalable BSS not equiopoed MC820 MC41B ( <-HO_REQUIRED_REJECT-) 1 · 5 · 36 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 36 .HO_REQUIRED -------> ----------CR (HO_REQUEST) -----> <----. Start T9113 <-------------------------.-.HO_ACCESS ----- <-------------------------.UA ------------.. CASES > Incoming external HO fail: MS access problem MS serving_cell BSC MSC BSC target_cell MS .HO_ACCESS --------.HO_FAILURE serving_cell (reversion to old channel) .CC --------------------------------------.SABM --.HO_COMMAND -----------------------------------------------Start T8 ----.CHA_ACT_ACK -------<----.Radio Failure z HO FAIL.X ----. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 37 .HO_REQUIRED -------> ----.Start T9113 (HO-COMMAND) included MC821 X --.SABM --------> <--.MEAS_REPORT -> BSC ------------------------------------------> MSC BSC MC643 Release of connection target_cell MS ----------CR (HO_REQUEST) -------------------> MC820 <-------.CHANNEL_ACT ----------> <--. Both radio failures with Reversion Old Channel and radio drop are counted together.CC --------------------------------------.X ----.HO-COMMAND) included° MC821 X --.CHANNEL_ACT ----------> <--.ESTABLISH_INDICATION-> MS ----..HO_ACCESS ----X ---.HO_REQUEST_ACK----------------------.X ------.HO_COMMAND -----------------------------------------------.MEAS_REPORT -> ------.MEAS_RESULT --------> MC645A ---.HO_REQUIRED -------> ----------CR (HO_REQUEST) -------------------> MC820 <-------.MEAS_RESULT --------> MC645A ---.CHA_ACT_ACK -------Start T9113 <----.SABM --.SABM --.CLEAR_COMMAND ----------------------> Radio interface fail : Reversion to old channel T9113 expiry MC643 Release of connection 1 · 5 · 37 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All incoming external HO failures due to radio problems are counted in the same counter MC643.HO_ACCESS ----Start T8 X ---.HO_REQUEST_ACK----------------------.4 External Intercell Handovers Incoming External HO . Counters REQUEST ATTEMPT Preparation Failure NO CIC ALLOC SUCCESS Execution Failure CONGESTION BSS PB INCOMING EXTERNAL Handover Preparation Request no CIC alloc MC820 MC41b MC541a+MC81 MC541+MC81 MS ACCESS PB BSS PB Congestion BSS Pb Execution Attempt Radio (MS access problem) BSS Pb Success 1 · 5 · 38 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring MC820-MC821-(MC541+MC81) MC821 MC643 MC821-MC642-MC643 MC642 All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 38 .4 External Intercell Handovers Incoming External HO . DEFINITION OF QUALITY OF SERVICE INDICATORS: Handover Statistics INDICATORS > Incoming handover > Incoming Inter BSC z z z z z z GHOIMEFR: efficiency of the incoming external HO execution GHOIMCGR: rate of incoming external HO failures due to radio congestion (Air or Abis TCH) GHOIMAMR: rate of incoming external HO failures due to CIC congestion (A TCH) GHOIMPFR: rate of incoming external HO failures due to BSS during the preparation phase GHOIMFLRR: rate of incoming external HO failures due to radio problems GHOIMFLBR: rate of incoming external HO failures due to BSS during the execution phase Inter PLMN Incoming External HO Indicators (from B8) An indicator is created for each counter: z z z REQUESTS ATTEMPTS SUCCESS In addition. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 39 . the ratio of incoming inter-PLMN HO to incoming intra-PLMN and inter-PLMN HO. these indicators show: z z the success rate of incoming inter-PLMN HOs.4 External Intercell Handovers Incoming External HO .Indicators 1 · 5 · 39 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS . Failures z Cases of Failures (Outgoing) ƒ Handover Preparation: y No detail available.4 External Intercell Handovers Outgoing External HO . only generic "preparation failures" ƒ Handover Execution: y radio problem: the MS reverts to the old channel y radio problem: the MS drops y BSS problem (no specific counter) HO_Out_MSC_required HO_Out_MSC_request HO_Out_MSC_prep_fail (deduced) HO_Out_MSC_success HO_Out_MSC_ROC HO_Out_MSC_drop_radio HO_Out_MSC_drop_BSS (deduced) 1 · 5 · 40 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 40 . MEAS_RESULT --------> MC645A ---.4 External Intercell Handovers Outgoing External HO .Radio Failure with ROC MS serving_cell BSC MSC BSC target_cell MS .HO_REQUIRED -------> <-------------------------.HO_FAILURE (reversion to old channel) ------------------------------------------> MC647 ----.CHANNEL_ACT ----------> <--.ESTABLISH_INDICATION-> ----------CR (HO_REQUEST) -------------------> <-------.SABM --------> <--.CHA_ACT_ACK -------<----.CLEAR_COMMAND ----------------------> Radio interface fail : Reversion to old channel Release of connection 1 · 5 · 41 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 41 .HO_COMMAND -----------------------------------------------Start T8 MC650 ----.Start T9113 (HO-COMMAND) included X --.MEAS_REPORT -> ------.HO_REQUEST_ACK----------------------.HO_ACCESS ----X ---.UA ------------.CC --------------------------------------.-..HO_ACCESS ----- ----. HO_ACCESS ----- Release of connection 1 · 5 · 42 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 42 .CLEAR_REQUEST -> MC648 Radio interface message fail ----------CR (HO_REQUEST) -------------------> <-------.HO_ACCESS ----X ---. no reversion to old channel detected serving_cell BSC MSC BSC target_cell MS MS .X T8 expiry ----.X ----.HO_COMMAND -----------------------------------------------Start T8 MC650 ----.SABM --.SABM --.HO_REQUIRED -------> <-------------------------.Radio Failure Drop z In this case.4 External Intercell Handovers Outgoing External HO .Start T9113 (HO-COMMAND) included X --.SABM --.CHANNEL_ACT ----------> <--.MEAS_REPORT -> ------.X ----.CHA_ACT_ACK -------<----..MEAS_RESULT --------> MC645A ---.CC --------------------------------------.HO_REQUEST_ACK----------------------. Counters REQUEST ATTEMPT Preparation Failure SUCCESS Execution Failure CONGESTION BSS PB OUTGOING EXTERNAL Handover Preparation Request Any preparation failure Execution Attempt Reversion old channel Drop radio BSS Pb Success 1 · 5 · 43 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring MC645A MC645A-MC650 MC650 REVERSION OLD CHANNEL DROP RADIO BSS PB MC647 MC648 MC650-MC646-MC647-MC648 MC646 All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 43 .4 External Intercell Handovers Outgoing External HO . these indicators show: z z the success rate of outgoing inter-PLMN HOs.DEFINITION OF QUALITY OF SERVICE INDICATORS RELEASE: Handover Statistics INDICATORS > Outgoing handover > Outgoing Inter BSC z z z z z GHOOMRQR: efficiency of the outgoing external HO preparation GHOOMEFR: efficiency of the outgoing external HO execution GHOOMOCR: rate of outgoing external HO failures due to radio problems with Reversion Old Channel GHOOMCDRR: rate of outgoing external HO failures due to radio problems with drop GHOOMCDR: rate of incoming external HO failures with drop (radio + BSS) Inter PLMN Outgoing External HO Indicators (From B8) An indicator is created for each counter: z z z REQUESTS ATTEMPTS SUCCESS In addition. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 44 .4 External Intercell Handovers Outgoing External HO .Indicators 1 · 5 · 44 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS . the ratio of outgoing inter-PLMN HO to outgoing intra-PLMN and inter-PLMN HO. extract (if available): 1) 1 incoming external HO success 2) 1 outgoing external HO success 3) 1 incoming external HO failure 4) 1 outgoing external HO failure Time allowed: 15 minutes 1 · 5 · 45 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 45 .REC.4 External Intercell Handovers External HO .Exercise z In PAIB29. 5 Handovers QoS per Adjacency 1 · 5 · 46 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 46 . target) cells permanently through PM type 180 counters 3 counters for each (Serving.b) C40i(c.C401(S. MC646(T) are the counters relating to the incoming internal handovers requested. MC821(T).b) C40i(c.5 Handovers QoS per Adjacency Type 180 Counters z Some handover indicators available per couple of (serving.d) a c d e C40i(f. „ „ All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 47 .T): Incoming handovers attempted to cell T from cell S . MC820(T). attempted and successfully performed to cell T.T): Incoming handovers requested to cell T from cell S . MC830(T). MC831(T).d) both internal and external inter cell handovers are counted both SDCCH and TCH handovers are counted f 1 · 5 · 47 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 According to the definition of C40i counters: z z z ∑ C400(Sn. MC642(T) are the counters relating to the incoming external handovers requested. attempted and successfully performed to cell T.C400(S.T) = MC642(T) + MC652(T) z where „ Sn are the serving cells considering the incoming adjacencies to cell T.Target) adjacency: .T) = MC820(T) + MC830(T) ∑ C401(Sn.C402(S.T): Incoming handovers successfully performed to cell T from cell S b C40i(a.T) = MC821(T) +MC831(T) ∑ C402(Sn. 5 Handovers QoS per Adjacency Type 180 Indicators z From these 3 counters, the following indicators are computed: 100 Cell B Cell A 10 300 150 200 220 Cell C Fill up Matrix Inc allocated Matrix Inc efficiency Matrix Inc unsuccess rate rate rate Fill up Matrix Inc request Cell A - Cell B Cell A - Cell C Cell B - Cell A Cell B - Cell C Cel C - Cell A Cell C - Cell B 100 10 150 220 300 200 30 30 Matrix Inc allocated 80 10 Matrix Inc success 40 10 80/100 100% 40/80 100% (100-40)/100 100% 10% 100% 10% 1 · 5 · 48 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Note : in NPO, when n/a is seen in the table, it means "0" (= no HO were done during the period) All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 48 5 Handovers QoS per Adjacency Type 180 Indicators [cont.] z The following indicators can be computed from PM Type 180 counters in order to: ƒ Detect the most important neighboring cells as per their traffic y Distribution of incoming handovers performed to cell T from serving cells Sn = C402(Sx,T) / ∑ C402(Sn,T) ƒ Ease the diagnosis of the bad handover performance of a cell y Global Success of incoming handovers to cell T from cell S HOOASUR = C402(S,T) / C400(S,T) y Allocation Success of the incoming handover preparation to cell T from cell S HOOACAR = C401(S,T) / C400(S,T) y Efficiency of the incoming handover execution to cell T from cell S HOOAEFR = C402(S,T) / C401(S,T) n 1 · 5 · 49 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS - DEFINITION OF QUALITY OF SERVICE INDICATORS: Handover Statistics > HO Statistics per couple of cells > Indicators with counter type 180 z These indicators can also be used to check if a recently handover relationship is generating handover as expected. They will also allow to identify the handover relationships which should be deleted since no (or very few) handover is observed. z All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 49 5 Handovers QoS per Adjacency Type 26: TCH outgoing handover per adjacency z Some handover indicators are available per couple of (serving, target) cells on demand for all outgoing adjacencies of a serving cell through PM type 26 (40 cells since B8) Tb Target a Serving C72i(S,Te) C72i(S,Tc) C720 Outgoing TCH handover attempts Tc C721 Outgoing TCH handover successes. C722 Outgoing TCH handover -execution radio failures with ROC C723 Outgoing TCH handover -execution radio failures without ROC C724 Outgoing TCH handover for an emergency cause C725 Outgoing TCH handover for a better cell cause C727 Outgoing TCH handover for a traffic cause C728 Outgoing TCH handover for FDR Te Tf 1 · 5 · 50 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 50 5 Handovers QoS per Adjacency Type 27: 2G TCH incoming handover per adjacency z Some handover indicators are available per couple of (serving. C738(Sx. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 51 . Sc C733 Incoming 2G TCH handover execution radio failures with or without ROC C734 Incoming 2G TCH handover for an emergency cause C735 Incoming 2G TCH handover for a better cell cause C737 Incoming 2G TCH handover for a traffic cause C738 Incoming 2G TCH handover for FDR Se Sf C738 Incoming 2G TCH handover with unknown or missing causes 1 · 5 · 51 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Other counters are provided: z z z z C734(Sx. The set of Type 27 counters can be retrieved for only one cell per BSS at once. C737(Sx.T): Incoming handovers attempted from Sx to T for a forced directed retry cause.T): Incoming handovers attempted from Sx to T for a traffic cause.T): Incoming handovers attempted from Sx to T for an emergency cause. C730 Incoming 2G TCH handover attempts Sb Serving a Target C73i(Se.T): Incoming handovers attempted from Sx to T for a better cell cause.T) C731 Incoming 2G TCH handover successes. target) cells on demand for all incoming adjacencies of a target cell through PM type 27. C735(Sx.T) C73i(Sc. 5 Handovers QoS per Adjacency Type 27 Indicators z The following indicators can be computed from PM Type 27 counters in order to ease the diagnosis of the bad incoming handover performance of a cell: ƒ Efficiency of the incoming handover execution to cell T from cell Sx HOIXSUR = C731(Sx.T) ƒ Rate of incoming ho execution failures due to BSS problems to cell T from cell Sx HOIXCDBR= [C730(Sx.T) ƒ Rate of incoming ho execution failures due to MS radio access problems to cell T from cell Sx HOIXCDRR = C733(Sx.T) 1 · 5 · 52 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS .T) / C730(Sx.T)-C731(Sx.T)-C733(Sx.DEFINITION OF QUALITY OF SERVICE INDICATORS: Handover Statistics > HO Statistics per couple of cells > Indicators with counter type 27 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 52 .T) / C730(Sx.T)] / C730(Sx. 6 Inter-PLMN and Inter-RAT 1 · 5 · 53 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 53 . Handovers towards UMTS cells belonging to a different PLMN are not possible if CGI_3G_REQUIRED is set to 0. CI is the Cell Identification. outgoing inter-PLMN HO are available (incoming were always available) Usage of CGI n the OMC-R allows to define outgoing inter-PLMN adjacencies (serving cell from own PLMN. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 54 . LAC is the Location Area Code. Inter-PlMN external cells are defined by their CGI Outgoing Incoming 1 · 5 · 54 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 MCC is the Mobile Country Code. Handovers towards cells belonging to a different PLMN are not possible if CGI_REQD is set to 0.6 Inter-PLMN and Inter-RAT Inter-PLMN HO Description z z Since B8. MNC is the Mobile Network Code. The MS will only measure those Neighbour cells which have a BSIC whose PLMN colour code matches with the coding in the “NCC Permitted” transmitted to the MS in the SYSTEM INFORMATION TYPE 6. target cell from foreign PLMN) OMC-R FRANCE ITALIE External cells : belong to another OMC-R (from own PLMN or foreign PLMN) Internal cells : belong to this OMC-R Up to 4 foreign PLMN's can be defined in one OMC-R. 6 Inter-PLMN and Inter-RAT Inter-PLMN Indicators RTCH_HO_Inc_InterPLMN_request RTCH_HO_Inc_InterPLMN_request_ratio B11 RTCH_HO_Inc_InterPLMN_allocated RTCH_HO_Inc_PLMN_fail_cong B11 RTCH_HO_Inc_InterPLMN_success RTCH_HO_Out_InterPLMN_request RTCH_HO_Out_InterPLMN_attempt RTCH_HO_Out_InterPLMN_success 1 · 5 · 55 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 RTCH_HO_Inc_InterPLMN_request_ratio : RTCH_HO_Inc_InterPLMN_request / RTCH_HO_request All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 55 . 6 Inter-PLMN and Inter-RAT 2G-3G Indicators INCOMING HO_Inc_MSC_3G_2G_request HO_Inc_MSC_3G_2G_TCH request HO_Inc_MSC_3G_2G_allocated HO_Inc_MSC_3G_2G_TCH request_emergency HO_Inc_MSC_3G_2G_TCH_fail_3Gcong HO_Inc_MSC_3G_2G_HOreject_HL_Time HO_Inc_MSC_3G_2G fail_prep_System HO_Inc_MSC_3G_2G_success HO_Inc_MSC_3G_2G_fail_radio HO_Inc_MSC_3G_2G_fail_BSS OUTGOING HO_Out_MSC_2G_3G_required HO_Out_MSC_2G_3G_request HO_Out_MSC_2G_3G_prep_fail HO_Out_MSC_2G_3G_success HO_Out_MSC_2G_3G_ROC HO_Out_MSC_2G_3G failure_radio HO_Out_MSC_2G_3G drop_BSS 1 · 5 · 56 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 HO_Inc_MSC_3G_2G_HOreject_HL_Time : . Whenever the 3G_HOReject_Load State in the cell is reported as high or reported as indefinite while the previous state was high. This counter shall be incremented only if THR_CELL_LOAD_3G_REJECT < 100%.e. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 56 .i.Cumulative time (in seconds) during which the Cell is in 3G high load state . 7 Key Performance Indicators 1 · 5 · 57 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 57 . 7 Key Performance Indicators Handover Cause Distribution Indicator Formulae Threshold Com men ts Ref. AMRS. GHCSTEIFDR. name Unit HO cause distribution (MC67w or MC785x or MC586y or MC10zz or MC447 or MC461 (MC67all + MC785all + MC586all + MC10all + MC447 + MC461) •MC67all=MC671+MC672+MC673+MC674+MC675+MC676+MC677+MC6 78+MC679+MC670 •MC785all = MC785a + MC785d + MC785e + MC785f (Microcell) •MC586all = MC586a + MC586b + MC586c (concentric) •MC10all = MC1040 + MC1044 + MC1050 •Qual DL > 10% •Qual UL > 10% •Level UL > 20% •Level DL > 20% •Interf UL > 5% •Interf DL > 5% •Better Cell < 30% GHCSTBPBR. GHCSTEDIR. GHCCCELVUR. GHCSTBDRR. Better Cell. GHCMCELVDR. Concentric Cell. Distance. GHCMCELVUR. GHCMCEBSR. GHCSTEQLUR. GHCCCBCPR. GHCSTAMR. Micro cells HO. Interband. GHCMBBCPR. GHCSTBTFR % z z HO CAUSE DISTRIBUTION : distribution of HO attemps by cause X : UL/DL Qual. Traffic. TFO causes Indicator aiming at measuring the efficiency of planning /optimization 1 · 5 · 58 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 58 . UL/DL Lev. GHCCCELVDR. GHCSTEMIR. GHCSTEQLDR. UL/DL Interference. GHCSTELVDR. GHCSTEIFUR GHCSTELVUR. GHCMCBCPR. name GHCSTEIFDSR.7 Key Performance Indicators Handover Standard Cause Distribution Indicator Distribution HO cause standard Formulae (MC67x) / GLOBAL HO CAUSE STANDARD • MC67x = MC670 or MC672 or MC671 or MC673 or MC676 or MC677 or MC678 or MC674 or (MC670+MC672) or (MC671+MC673) or (MC676+M677) Threshold Com men ts Ref. GHCSTELVUSR. GHCSTEQLDSR. level too low. high interference and MS-BTS distance too long. GHCSTEIFSR. GHCSTEQLSR. GHCSTEQLUSR. GHCSTEDISR Unit % DISTRIBUTION HO CAUSE STANDARD : Distribution of Handover attempts by standard cause : Power Budget. z Indicator aiming at measuring the efficiency of planning / optimization z Interesting for comparing HO distribution after concentric or micro cell implementation z 1 · 5 · 59 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 The Global HO cause standard indicator is defined as below: where: z z z z z z z z MC670: Number of handover attempts cause 2: "uplink quality too low" MC672: Number of handover attempts cause 4: ”downlink quality too low" MC671: Number of handover attempts cause 3: "uplink level too low" MC673: Number of handover attempts cause 5: "downlink level too low" MC676: Number of handover attempts cause 15: "too high uplink interference level" MC677: Number of handover attempts cause 16: "too high downlink interference level" MC678: Number of handover attempts cause 12: "too low power budget" MC674: Number of handover attempts cause 6: "MS-BTS distance too long" All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 59 . GHCSTELVDSR. GHCSTELVSR. GHCSTEIFUSR. quality too low. GHCSTBPBSR. 7 Key Performance Indicators Handover Cause Distribution zHANDOVER CAUSE rates 1 · 5 · 60 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Refer to BSS .DEFINITION OF QUALITY OF SERVICE INDICATORS: Handover statistics INDICATORS > Handover causes GHCXXYYYYR: Rate of specific HO cause xxyyyy versus all HO causes (Global) z z where XX = ST (standard) or MC (micro cell) or CC (concentric cell) or MB (multi band) and YYYY is specific to the cause All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 60 . It does not take into account the HO failures that can occur during the preparation phase when the new channel is being selected and activated. name GHOOREFR Unit % 1 · 5 · 61 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Global Outgoing HO success rate: represents the global efficiency of the outgoing handovers performed from one cell to any of its neighboring cells (same BSS or not). Ref.7 Key Performance Indicators Outgoing Handover Success Rate zGlobal success rate of Outgoing HO : Rate of successful outgoing external and internal intercell SDCCH and TCH HO Indicator HO_Out_success_rate Formulae HO_Out_success/HO_Out_required Thres hold 90% Comments This indicator includes preparation and execution. Ref. name GHOORSUR Unit % z Success rate of execution of Outgoing HO : Rate of successful outgoing external and internal intercell SDCCH and TCH HO Formulae HO_Out_success/HO_Out_request Thres hold 90% Indicator HO_Out_efficiency_rate Comments This indicator takes into account HO execution only (not HO preparation). HO_Out_success = HO_Out_MSC_2G_3G_success + HO_Out_MSC_2G_2G_success + HO_Out_BSC_success HO_Out_required = HO_Out_MSC_2G_2G_required+HO_Out_BSC_required+HO_Out_MSC_2G_3G_required HO_Out_request = HO_Out_MSC_2G_2G_request+HO_Out_BSC_request+HO_Out_MSC_2G_3G_request All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 61 . Efficiency of Outgoing HO execution: represents the efficiency of the channel change procedure during outgoing handovers performed from one cell to any of its neighboring cells (same BSS or not). Efficiency of Incoming HO execution: represents the efficiency of the channel change procedure during incoming handovers performed to one cell from any of its neighboring cells (same BSS or not). HO_Inc_success = HO_Inc_MSC_success + HO_Inc_BSC_success HO_Inc_request = HO_Inc_MSC_request + HO_Inc_BSC_request HO_Inc_allocated = HO_Inc_MSC_allocated + HO_Inc_BSC_allocated All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 62 . name GHOIREFR Unit % 1 · 5 · 62 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Global Incoming HO success rate: represents the global efficiency of the incoming handovers performed to one cell from any of its neighboring cells (same BSS or not). It does not take into account the HO failures that can occur during the preparation phase when the new channel is being selected and activated. Ref. name GHOIRSUR Unit % z Success rate of execution of Incoming HO : Rate of successful incoming external and internal intercell SDCCH and TCH HO Formulae HO_Inc_success / HO_Inc_allocated Thres hold 90% Indicator HO_Inc_efficiency_rate Comments Excluding congestion failures and BSS preparation failures from requests.7 Key Performance Indicators Incoming Handover Success Rate zGlobal success rate of Incoming HO : Rate of successful incoming external and internal intercell SDCCH and TCH HO Indicator HO_Inc_success_rate Formulae HO_Inc_success / HO_Inc_request Thres hold 90% Comments Ref. Interference Interference usually occurs when more than one idle channel appear in the highest interference band.3 Key Performance Indicators Handover Failure Main Causes z Main Causes of handover failure ƒ Bad handover parameters settings (check with the RFT Training) ƒ Hardware fault (TRX board fault) ƒ Congestion ƒ Interference ƒ Coverage ƒ Clock or timer mismatching 1 · 5 · 63 B11 GSM QoS Monitoring · Handover Indicators GSM B11 · BSS B11 GSM Quality of Service & Traffic Load Monitoring All Rights Reserved © Alcatel-Lucent 2010 Coverage z Coverage hole Coverage hole may exist when coverage areas of two BTSs do not overlap or there are some big obstacles in the coverage area. If the interference is external. z Over shooting In the actual network. it will usually increase with the growth of traffic. the high BTS antenna can propagate far away along a road and serve in area which it’s not suppose to serve in. this lead to no signal or very poor signal level. it is usually not related to traffic. All Rights Reserved © Alcatel-Lucent 2010 3JK12195AAAAWBZZA Issue 1 Section 1 · Module 5 · Page 63 . If the interference is internal. Congestion: see previous case study Timer mismatching: check with the NSS team whether BSS-NSS parameters are well set. There is also the possibility to work with the RMS (per TRX). If there are high Rx_lev but bad quality. but it may increase with the traffic growth if the interference is from the close analog network. it indicates that co-channel and/or adjacent-channel interference exist. which result in the "isolate Island" problem.