BS PA MFRMS - PSR Alcatel-Lucent

Improvement in PSR (Paging Success Rate) can be achieved by tuning of BS_PA_MFRMS and reducing Paging discards. Paging discards are mostly due to congestion in the BSC, on the Abis link and/or on the PCH (Paging Channel) ie Air interface.

Parameter:

• BS_PA_MFRMS

Target Cells: Cells with higher number of paging discards

Theory: 

• This parameter defines the the number of 51 multiframes between two consecutive occurrences of Paging group (a number of pagings)
• Higher value means less number of pagings will be transmitted in a given interval thereby conserving lesser power of the MS
• Reducing this parameter increases number of pagings per paging group (for a given value of MSC paging timer T3113) and therefore probability of no paging response decreases

Candidate Cell Priority (HO Priority) - CDR Alcatel-Lucent

Improvement in Quality and reduction in Call Drops can be achieved in Alcatel-Lucent (B11, B10) by proper adjustment of Candidate Cell Priority (HO Priority Level).

Parameter:

• Candidate_Cell_Priority

Target Cells: Radio Drops, HO Drops, Bad UL/DL Quality

Theory: 

• This parameter decides the priority of target cells for each source cell during Handover
• One standard approach is use highest priority for DCS neighbors (0), 2nd highest (1) for less interfered and 3rd highest (2) for others

Repeated SACCH/FACCH - CDR Alcatel-Lucent

Call Drops can be reduced to a great extent in the equipment of Alcatel-Lucent (B11, B10) by using the feature of repeated SACCH/FACCH frames.

Parameter:

• EN_REP_DL_FACCH
• EN_REP_SACCH

Target Cells: Radio Drops, HO Drops

Theory: 

• Each DLFACCH frame is sent twice by enabling this parameter thereby improving handover reliability in AMR Calls reducing call drop rate
• If a SACCH is not decoded correctly by MS, the BTS will resend it that enhances coverage and decreases drops (SACCH is used for transmission of radio measurement data such as TA, Power Control Info, SMS during call etc)