UMTS Paging Success Rate

Paging success rate is a KPI that can be checked if there are complaints involving user not responding messages or missed call notifications. If paging success rate is degraded, it is mainly due to poor coverage. In such case, below actions may be taken:

• increase minimum required received level (QRxLevmin) (eg:-111 to -105) and minimum required quality level (qqualmin) (eg: -18 to -15) of worst cells
• increase PICH power by a few dB (eg: -7 to -5) and increase downlink DCH AC threshold (eg: 85 to 95)
• reduce detected preamble threshold (dB) (eg: -21 to -24)
• increase PRACH initiation Tx power constant value (dB) (eg: -21 to -18)
• Reduce Location update timer both at the core and RNC (say from 3 hour to 1 hour)

Paging flow chart is given below for understanding.

Note:
Paging type 1 = Idle mode
Paging Type 2 = Dedicated mode

GSM - Low Paging Sucess Rate Issue

Paging discards can be a source low PSR or users complaining about getting "user not responding" messages as they call party B in GSM. The steps that can be taken to reduce or eliminate discards are as follows:

1- LAC Splitting
2- Cell paging capacity
      - can be increased of worst offenders
      - Shifting of SD/PD timeslots to non-BCCH TRXs
3- Audit of Periodic Location Update BSC Timer Value (t3212)
      - Can be set to 6 hours
      - This timer value at the MSC should be greater than the BSC value
4- Activation of Precise Paging Feature
      - Paging is done only on cells where there is high probability of finding subscribers according to the location record saved in the BSC