GSM TCH Channel Allocation Priorities - Zero Traffic Analysis

Zero traffic means the hardware is not carrying traffic even if there is blocking on the cell. Below are the steps to check for this issue:

1- Filter out TRXs having zero attempts/traffic
2- Check those cells TCH availability - if there is low TCH, then resolve low TCH first
3- Examine TCH blocking on these cells - if there is zero blocking, then the traffic is not high enough
4- Inspect the below TCH channel allocation priorities to finalize the zero traffic TRXs and recommend for health check

Note: TRXs can have zero or low assignments with normal ranges of availability if there is no blocking.

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