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

Mobile Originating Call Flow

Here is the detailed Mobile Originating Call Flow divided into 4 functional modules depicting the network nodes for easy comprehension:

Sector Swap (Cross-sector) Issue

Sector-Swap Issue means that sector of a site is serving the area in a direction different to its azimuth. For instance, sector 1 is serving the area of sector 2 and sector 2 is serving the area of sector 1. This is known as complete Sector Swap. Another type is Partial Swap in which the logical area of say sector 1 is served partially by sector 2 and partially by sector 1 itself.

This problem arises due to jumbled cables at the BTS which could be caused due to human mistake during site maintenance activities. Issue can be diagonosed through Drive Test results as well as observing the number of Handover requests in Handover statistics of the site.



The issue can cause increase in CDR, RxQual degradation, increased DL interference,

Resolution can be done by closely following the cables from the antenna to the respective TRX of each sector of the BTS and correcting the cross-connections.