114.2.2 Service Independent KPIs
114.2.2.1. Network Unavailability (%)
Denotes the probability that no packet-switched network is available in the cell currently used by the customer.
In GSM, the phone has access to a PS network if it has received System Information 13. This message is read once per KPI measurement cycle, at the beginning of the cycle.
In WCDMA, matters are simpler: the phone is always known to have access to a PS network.
The information element ""Mode - System"" in TEMS Investigation indicates whether the phone is connected to a WCDMA or a GSM network.
114.2.2.2. Attach Failure Ratio (%)
Denotes the probability that a subscriber cannot attach to the PS network.
114.2.2.3. Attach Setup Time (s)
Denotes the length of the time period taken to attach to the PS network.
114.2.2.4. PDP Context Activation Failure Ratio (%)
Denotes the probability that the PDP context cannot be activated. It is the ratio of unsuccessful PDP context activation attempts to the total number of PDP context activation attempts.
114.2.2.5. PDP Context Activation Time (s)
Denotes the length of the time period taken to activate a PDP context.
114.2.2.6. PDP Context Cut-off Ratio (%)
Denotes the probability that a PDP context is deactivated without this being initiated intentionally by the user.
PDP context deactivation not initiated intentionally by the user can be caused by either SGSN failure or GGSN failure, so the PDP context may be deactivated either by the SGSN or by the GGSN.
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Note:The precondition for measuring this parameter is that a PDP context has been successfully established. |