WelCome to Fusion Orientation Program on Fusion-TTC

Hardware issue -Huawei Presented byMd. MoniruzzamanONS Telecom Importance Why ?

Swap is interchange of Hardware To keep hardware functioning

IdentificationPath loss DownlinkUplinkPathloss (DL)= BTS Tx Power- MS Receive PowerPathloss (UL)= MS Tx Power- BTS Receive PowerPath Balance Uplink/Downlink balance=uplink pathloss - downlink pathloss

Huawei graded this path balance in 11 levels.Named level1,level2,.,level11

Level 1,2 === >Poor Downlink Level 11,12 == >Poor Uplink

Weaker Downlink from iManager

Weaker uplink >15 % sample Weaker Downlink >25 % sample (HW defined) Cause TASR TCH Assignment is a process of by which TCH is assigned to the MS. After the SDCCH request MS gets TCH successfully and the call transfers to TCH it means TCH assignment is successful. TRX 0BSDSDPPTTTTRX 1TTTTTTTTTRX 2TTTTTTTTBCCH,SDMS Channel set {BCCH,SD}Seeking for TCH (TRX 1)Poor TASR from iManagerPoor TASR < 0.95 (HW defined)

Cause Poor TASR causes DiversityTwo channel system

Tx Signal x(k)Path-1 receive signal r1(k)Path-2 receive signal r2(k)

Output signal,y(k)W1*r1(k)+W2*r2(k)

{W1,W2} Maximum SNR ratio criterion,Adaptive combining co-efficientLoss of Diversity Huawei has two customized counter for diversity check

S4556:Average Main Level in the Customized MR(dBm)S4557:Average Diversity Level in the Customized MR(dBm)

Diversity = 10*log10(S4556/S4557)

If Diversity falls {-6 to 6} dB ---- ok

If Diversity falls out of this range --------loss of diversity

Diversity loss from iManager

Loss of diversity if range exceed {-6 to 6}dB (HW defined)Diversity fails this time frameAbis drop Huawei has four indication to measure Abis drop

Call Drops due to Abis Terrestrial Link FailureSeverely Error Second (SES)Errored Second (ES)Cyclic Redundancy Checksum (CRC)

SES ES Measure Algorithm

Abis drop (SES/ES)

AlarmsSeverity Category

Critical MajorMinor

Some RF related alarms E1/T1 AlarmOML FaultRF Unit VSWR Threshold CrossedBBU CPRI Interface ErrorGSM Cell out of Service

Some more RF related Alarms# [html]ALM-20204 Clock Signal Outputs Faulty# [html]ALM-20204 Clock Signal Inputs Faulty# [html]ALM-20205 System Clock Reference Source Unavailable# [html]ALM-20206 Current System Clock Reference Source Status Abnormal# [html]ALM-20207 Failure in Locking System Clock Source# [html]ALM-20208 Clock Reference Source of Main Control Board Unavailable# [html]ALM-20209 Faulty Phase-Locked Loop of the Board Clock# [html]ALM-20210 Current Clock Reference Source of Main Control Board Abnormal# [html]ALM-20220 Incorrect Connection of Ethernet Cables Between Subracks# [html]ALM-20221 Link Between GE Switching Boards Faulty# ALM-20222 Communication Between GE Switching Boards Faulty1.ALM-21512 LAPD Link Fault 2.ALM-2204 TRX Communication Alarm3.ALM-21801 GSM Cell out of Service4.ALM-2214 E1/T1 Local Alarm5.ALM-25802 E1/T1 Remote Alarm Indication Signal

Thanks