3G Basic KPI Optimization

Case 1: Drop due to missing neighbor  Problem: Detected Nighbor (DN)

Mobiloe Station sends a Report ,which it measured in site ,that contains event 1A means adding a new RL (cell) to Active Set The reported cell should be present in current neighbor cell list,If it not available means and then reported Ec/No is better than the best serving cell Ec/No in AS by some dBs (set by a RNC parameter) In any movement,new cell can not be added to Aativr Set,if we addd means ,call will be released

Figure : Drop -due -to -missing- neighbor

Case 2: Drop due to Poor Coverage (low RSCP) Â Problem: Poor DL coverage

When Mobie Station have a low RSCP value ( < -107 dBm).At the time Ec/No values,call Drop will happen,Mobilw Staion will likely lift up up the transmitted power and reach its max power. The DL BLER will probably increase and SIR target cannot maintain anymore, finally the call drops.

Figure : Drop -due- to -Poor -Coverage

Case 3:Due to Poor DL Coverage

If Mobile Station enters into a RSCP level (< – 105 dBm ) means ,it have low coverage area at the time (.The packet connection is carried on a 64/64 DCH Channel as consequence of the low coverage conditions. The UE is Lift up the Mobile Station power to the maximum,it reach to Idle Mode and theApplication and RLC throughputs go to zero. At this point the RAS application will start the Session Timeout timer, if the throughput is not resumed the Session Error event is triggered with cause “session timeout”.

Figure : Session -Error - due -to- Poor Coverage

Optimization in UMTS(3G) network &Tuning in UMTS(3G) network Share on linkedinShare on facebookShare on twitterShare on emailMore Sharing Services Optimization/Tuning of UMTS(3G) network Some Difference are will come ,While doing optimization and Tuning process in network . During Tuning process in network ; Site is not on Air ,so there is No traffic in network. Tuning of Network is according to our drive test data Every thing is done before the Site on Air ,It is about Pre-launch activities During Optimization Optimization is the Process done after Site On Air,when the customer start to use the network. Optimization is the Process to monitor network performance. Tuning Process Flow

Figure : Tuning Process Flow

Tuning Process Flowchart

Figure : Tuning Process Flowchart Tools For Tuning/Optimization & Data Post Processing TEMS Investigation for WCDMA (Software) TEMS Scanner (Software + HW) External GPS User Equipment (UE) TEMS DeskCat for post processing MCOM3g/Mapinfo MS Access/Excel based tools

Figure : Optimization/Tuning of UMTS(3G) network  Drive Test Routes

Figure : Drive Test Routes PILOT TUNING The basic measurements of scanner are CPICH_RSCP (received signal code power) CPICH_Ec/No (received energy per chip divided by the power density in the band) RSSI (received signal strength indicator) use of scanner in network ? we can find feedercable problem we can find Coverage problem Find Interference problems (overshooting cell, pilot pollution) Find the Missing neighbours COVERAGE VERIFICATION – Primary Common Pilot Channel Verify P-CPICH detection to minimize coverage holes P-CPICH RSCP P-CPICH Ec/No

Figure : Level of Signal CPICH_RSCPÂ (received signal code power) Best Server Signal Strength Yellow means good(No problem in network) Blue make problems in feature Grey is bad

Figure : Best Server Signal Strength Pilot Ec/No Measurements Green means good(No problem in network) Blue make problems in feature Orange is bad

Figure : Pilot Ec/No Measurements

INTERFERNECE By correlating low Ec/No with high RSCP, areas with high interference can be detected

Figure : INTERFERENCE INTERFERENCE (RSCP > -90 dBm AND Ec/No < -9 dB)

Figure : INTERFERENCE (RSCP > -90 dBm AND Ec/No < -9 dB)  Primary Common Pilot Channel (P-CPICH) – PILOT POLLUTION

Figure: Primary Common Pilot Channel (P-CPICH) – PILOT POLLUTION  OVERSHOOTING Change Proposal: Site-D, Sector-1, Antenna Down-tilt 8 Degrees

Figure : Overshooting in Site Primary Common Pilot Channel (P-CPICH) – PILOT POLLUTION High CPICH reception levels from many Cells, (more than MAX_ACTIVE_SET) P-CPICH RSCP P-CPICH Ec/No

Figure : Pilot Pollution

Figure : Pilot Pollution Rectification Figure : PILOT POLLUTION Change Proposals

Figure : PILOT POLLUTION Change Proposals Pilot Pollution

Figure : Shows Pilot Pollution (Initial and After Tunning ) UE TUNING Voice /Video/PS calls Long calls short calls Identify problem areas Blocked calls Dropped calls Delay/Throughput

Short Calls Analysis make a call and maintain it for some time duration (for 15-60 s)  Call set-up failure and drops of short calls mainly due to: user Equipement Failure Because of Parameters Setting Due to Coverage Problem Due toInterference Long Calls Analysis Make a call and maintain the Call upto drop ( because by this we can check the Retainability performace of network) Drops during long call can be used to identify: we can identify the Missing Neighbor Relation Coverage Problem user Equipement Problems Network Characteristics Because of Parameters Setting

KPI Parameters for 3G are following: 1) RRC attempt 2.RRC Failure rate 3.RRC drop rate. 4.RAB CS voice failure rate 5.RAB CS voice drop rate 6.RAB DATA failure rate 7.RAB Data drop rate 8.HSDPA Failure rate 9.HSDPA drop rate 10.SHO failure 11.ISHO failure rate 12.IFHO failure rate 13.EDCH estab failure rate 14.EDCH abnormal release rate. Various Types of Commands we are using in KPI maintaining 1) RRC Drop RRC_CONN_ACT_FAIL_IU RRC_CONN_ACT_FAIL_RADIO RRC_CONN_ACT_FAIL_BTS RRC_CONN_ACT_FAIL_IUR RRC_CONN_ACT_FAIL_I_CHK RRC_CONN_ACT_FAIL_CIPH RRC_CONN_ACT_FAIL_RNC RRC_CONN_ACT_FAIL_UE RRC_CONN_ACT_REL_UNSPEC_CN RRC_CONN_ACT_COMP 2)RAB Voice Drop Rate

RAB_ACT_FAIL_CS_VOICE_IU RAB_ACT_FAIL_CS_VOICE_RADIO RAB_ACT_FAIL_CS_VOICE_BTS RAB_ACT_FAIL_CS_VOICE_IUR RAB_ACT_FAIL_CS_VOICE_RNC RAB_ACT_FAIL_CS_VOICE_UE RAB_ACT_REL_CS_V_UNSPE_ER_CN 3)RAB Data Failure Rate RAB_STP_FAIL_PS_INTER_AC RAB_STP_FAIL_PS_INTER_RNC RAB_STP_FAIL_PS_INTER_ANCH RAB_STP_FAIL_PS_INTER_FROZBS RAB_STP_FAIL_PS_BACKG_AC RAB_STP_FAIL_PS_BACKG_RNC RAB_STP_FAIL_PS_BACKG_ANCH RAB_STP_FAIL_PS_BACKG_FROZBS RAB_ACC_FAIL_PS_INTER_MS RAB_ACC_FAIL_PS_INTER_RNC RAB_ACC_FAIL_PS_BACKG_MS RAB_ACC_FAIL_PS_BACKG_RNC RAB_STP_ATT_PS_INTER RAB_STP_ATT_PS_BACKG 4)KPI and Counter. RAB_STP_FAIL_CS_VOICE_AC RAB_STP_FAIL_CS_VOICE_BTS RAB_STP_FAIL_CS_VOICE_TRANS RAB_STP_FAIL_CS_VOICE_RNC RAB_STP_FAIL_CS_VOICE_FROZBS RAB_ACC_FAIL_CS_VOICE_MS RAB_ACC_FAIL_CS_VOICE_RNC RAB_STP_ATT_CS_VOICE 5)KPI and Counters are: RRC_CONN_STP_FAIL_HC RRC_CONN_STP_FAIL_AC RRC_CONN_STP_FAIL_BTS RRC_CONN_STP_FAIL_TRANS RRC_CONN_STP_FAIL_RNC RRC_CONN_STP_FAIL_FROZBS RRC_CONN_ACC_FAIL_RADIO RRC_CONN_ACC_FAIL_MS RRC_CONN_ACC_FAIL_RNC