Factors Affecting Throughput in LTE :- Low mcs, Low sinr, Low rsrq , high prb usage, wrong earfcn Definition, no Carrier aggregation ör missing ca configuration, Pci , Route sequence index collision, Wrong tac planning, gateway security problem, etc. air quality (now sinr, rsrq, etc etc), modulation level. For example, 16QAM, 64QAM, etc. Low Throughput Issue:- 1 - Poor coverage (BLER) 2 - Availability issue 3 - Uplink Interference 4 - A poor RACH decoding SR 5 - High error on S1 link. 6 - Delay on S1 link towards MME & SGW. 7 - Accessibility issue. 8 - Handover failure. 9 - Lack of PRBs. 10 - Problematic UE. 11 - Downlink Interference (Bad CQI) 12 - MIMO Parameters 13 - High VSWR 14 - High radio errors or instability issue. 15 - Maximum number of RRC connections active per cell 16 - Maximum number of users per TTI supported per cell. 17 - Core network, MME/SGW, etc 18 - Transmission instability & bottleneck. 19 - Incorrect parameter setting. 20 - Badly tuned handover parameters...
CPC (Cell Parameter Check)
Given are the parameters that need to be checked while performing CPC.
CGI (Cell Global Identity) consists if MCC+NCC+LAC+CI
BCCH Frequency
BSIC
GSM Band
nDefinitions:
1.Time: It is system time of computer.
2.Cell name: It displays the name of the sector which is serving according to the cellfile that is loaded in TEMS.
3.CGI : It stands for the Cell Global Identity which is unique for every sector of the site. It consists of MCC,MNC,LAC,CI.
MCC: Mobile Country Code 0 – 999 MNC: Mobile Network Code 0 – 99 LAC : Location Area Code 0 -65535 CI: Cell Identity 0 – 65535
•Cell GPRS Support: Tells sector is having GPRS or not. Values are Yes or No .
•Band : It tells in which Freq. Band mobile is operating e.g. GSM 900/ 1800.
•BCCH ARFCN: It tells by which BCCH is the mobile station getting served.
•TCH ARFCN: On which Traffic Freq. call is going on.
•BSIC (Base Station Identity Code) : It is combination of Network Color Code (NCC) (0 – 7) & Base Station Color Code (BCC) (0 – 7). e.g. 62. It is decoded by mobile on every Sync. Channel Message.
•Mode: It is shows in which state is mobile operating, Idle, Dedicated & Packet.
•Time slot: On which time slot of current TCH call is going on. Viz. time slot no. of TRX.
•Channel Type: Type of channel mobile is getting now. Like BCCH / SDCCH/8 + SACCH/C8 or CBCH / TCH/F +FACCH/F +SACCH/F.
•Channel Mode : Shows mode of coding like Speech Full Rate of Half Rate.
•Speech Codec: It shows FR for Full Rate, HR for Half Rate & EFR for Enhanced Full Rate.
•Ciphering Algorithm : It shows ciphering algorithm used by the system to protect data for privacy. E.g. Cipher by A5/2.
•Sub Channel Number: It is displayed at a time when mobile is on dedicated mode at time of call setup when it is getting SDCCH at that time it shows which SDCCH it is getting out of 8 available. E.g. 2.
•Hopping Channel : It shows that current sector is having hopping feature or not. Values are Yes or No.
•Hopping Frequencies : It displays no. of freq. on which mobile is allowed to hop. viz. MA List for hopping of that sector.
•Mobile Allocation Index Offset (MAIO): It is the number which tells from which freq. from given MA list for sector hopping has to be started. E.g. 0 means sector will start from first freq. to hop.
•Hopping Sequence Number (HSN) : Indicates sequence in which frequencies are allowed to hop from the MA List. 0- 63. 0 for Cyclic Hopping, 1 – 63 random hopping sequences.
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