Parameter and Timer Tuning For KPI Improvement in Nigeria

 

 

An application parameter determines the time supervision period between sending of DISCONNECT message and receiving DISCONNECT or RELEASE message using theT305 timer. Value range = 1s-255s, Default Value = 30sec, Changed Value = 1sec 1s ec

An application parameter determines the time supervision period between sending of RELEASE message and receiving of RELEASE COMPLETE or RELEASE message using the T308 timer. Value range = 1s-255s, Default Value = 30sec, Changed Value = 1sec 1s ec

When BSC receives Clear CMD  message from MSC, BSC will start T3109, and after this time, t ime, Network will ignore the ERROR “

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INDICATION  message from BTS. So if we MSC can send CLEAR COMMAND  before T200 expiry, by changing T305 and T308, ”

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then the drops which are not subscriber perceived but triggered due to T200 expiry will be ignored. We can achieve this if: T305 + 2*T308 < (N200+1)*T200 (N200+1)*T200 T3122 defines the period that the MS must wait for before the second trial calling if the first trial calling fails. It aims to avoid congestion of SDCCH due to repeated trial calling by MS and to relieve system load. T3122 ranges from 0s to 255s.

Default Value =10sec.

 

 Changed value = 20s. The value of T3122 is included in the immediate assignment assig nment reject message. After the MS receives the t he immediate assignment reject message (no channels for signaling, A interface failure, overload of central processing unit, namely, CPU), it can send new trial calling request after T3122. T3122 aims to relieve radio signaling and voice channel resources. T3122 also help avoid systematic overload. When the CPU is overloaded, the system multiplies mu ltiplies T3122 by a factor (determined by processor Load Supconf) to increase T3122 through overload control. In peak load time, you can manage network access by increasing T3122. Namely, you can increase the interval between two continuous trial callings to relieve network load.

Minimum time between allocation attempts at an urgency condition and when the first allocation attempt has failed. In the case an urgency handover attempt fails due to congestion, the loc locating ating process will proceed and even a handover candidate list will be prepared. However the candidate list li st will not be transferred to the handover function during the time specified by the parameter TURGEN, unless the candidate list contains a better cell. Range from 0 to 120, SACCH periods (480 ms). Default Value =2. Changed value = 6.

Minimum time between allocation attempts when there is a better cell condition and when the first allocation attempt has failed. In the case a handover, intra cell handover or overlaid/underlaid subcell change fails due to congestion, the locating process continues but no handover candidate list will be prepared before the timer TALLOC has expired, unless an urgency state is detected.  Range from 0 to 120, SACCH periods (480 ms). Default Value =2.

Changed value = 6.

A good improvement in SD drop is observed after changing EIR/IMEI values as mention below.

Parameter Name

Current Settings

Proposed Settings

IMEICHECK

1

0

IMEICONTROLLU

1

0

IMEICHKWITHIMSI

1

0

 

 

ON---------Antenna Hopping state is hopping on all channels. ONXC0----Antenna Hopping state is hopping on all channels

frequency/frequencies.  

OFF------- Antenna

Hopping State is non-hopping.  

except channels on the BCCH

 

ANTA:-

Antenna A Designation. Name of antenna A connected to receiver. receiver . Range- 1 to 7 characters. ANTB:- 

Antenna B Designation. Name of antenna B connected to receiver. Range- 1 to 7 characters. NOTE--The parameter is only allowed to be changed when the receiver is out of service.

Parameter: 1:AW------ For TCH Drop Improvement 2: CCHPWR----For SD & TCH Drop Improvement 3:BSTXPWR AND BSPWR----For Handover improvement 4:BSRXMIN---- For Handover improvement