TCH Assignment Success Rate

Q. How to do improve the TCH assignment Success Rate of GSM Cells for ZTE equipment? What parameters to do change in order to improve this KPI

A. 1.  We can gain better rates by changing Half Rate / Full Rate discrimination levels. Further more little amount of TCH congestion can be overcome by changing SDD time slot to TCH.
     2. focus on removing tch congestion...chk for hardware issues.
     3. Make sure that it is a radio issue sometimes can be abis interface congestion and we can also try increasing the RxLevAccessMin, it is the easiest way, but not necessarily the right one. First try to improve the RF environment through physical optimization

what is difference between TDD & FDD in LTE ?

Q: what is difference between TDD & FDD in LTE ?

A: In FDD, the uplink and downlink channels are placed on different frequencies and can be in operation at the same time - hence "frequency-divided". In TDD, the uplink and downlink channels are placed at the same frequency and operate at different times - hence "time-divided". In most respects the actual signalling and data exchange methods are the same, though TDD requires tight control over synchronisation in order to prevent uplink and downlink signals from clashing.

RSRP Bad but SINR and RSRQ good

How to face an issue RSRP Bad but SINR and RSRQ good. my distance from site is 300m :

Low RSSI/RSCP but have a good SINR/RSRQ in such a short distance from site. This problem can be related to a couple things that I can think of.
1. sweep your antenna system to check if there is any defect(s) such as bad antenna, lines, connectors, etc. All these can contribute to low RSRP
2. if the sweep measurement is good, might want to check out tilt and/or investigate tilts to see if there is something that may alter the antenna pattern.
3. Check your power setting just in case if it was set to very minimal level.
if there is no obstacles towards the sector so antenna issue is suspected ,cross partial, vswr.

EcNo Improvement

How to EcNo improvement :

Try to troubleshoot the root cause of EcNo degradation.. Check below the major reasons and there rectification methodologies
1) Pilot Pollution: Analyse the Scan Mode DT in areas where EcNo is degraded.. If you find more than 4 to 5 or above SCs serving with in 5 to 10 dbm of ur best cell (and best cell is above -80 to -85 dbm) than go for tilt adjustments or Pilot power optimization.
2) Coverage Issue: If best cell is below -85 or -90 depending upon clutter type than try to increase coverage of logical server.
3) If RSCP is good and no pilot pollution: than try to reduce Max power of cells that doesn't have power rejections . this will improve the denominator of the EcNo formula i.e 10log(pilot/channel)
4)If none of the above condition is met than re-drive the areas in offload and loaded hours and check the difference, if offload hours EcNo is good than its purely Loading Impact and go for load sharing b/w freq(if more than 1 freq available)

improve DL/UL throughput in LTE & what are the causes for Poor DL/UL

How can improve DL/UL throughput in LTE & what are the causes for Poor DL/UL :

Throughput of cell mainly depends on CQI which is directly dependent on SINR.SINR depends on user number, bad dominant signal condition(RSSI),RSRP,RSRQ. So, improving the interference condition will lead to the better throughput. Throughput also depends on network latency. Also need to take into consideration your Carrier BW vs connected users/5MHz (anything over 65 users/5MHz leads to congestion), Overall DL/UL Spectral Efficiency, PRB Utilization%, PDCCH Usage, PCI Confusion, Overshooting cells, and Backhaul type/bandwidth.

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Causes of Radio Link Fault

The causes of radio link fault can be :

Interference

Internal interference

External interference

Equipment interference

Coverage hole

Isolated island

Uplink/downlink imbalance

Improper parameter setting

Radio link timeout, SACCH multi-frames

Handover parameters

Power control parameters

Equipment problem (Antenna, feeder, combiner, TRX)

Clock problem

Transmission problem