Measurement Counter
A9017:UP_GPRS_TBF_ABNORM_REL_CHAN_PREEMPT
Description
This measurement provides the number of uplink GPRS TBF abnormal releases due to channel preemption in a granularity period. A high measurement value is yielded because congestion occurs on the Abis interface or the dynamic PDCHs in use are occupied by the CS services. Refer to device alarms to locate the cause.
Unit
Integer number or integer.
Measurement Point
If a PDCH is occupied by the MS for CS services with a higher priority, or if congestion occurs on the Abis interface, then the BSC releases the PDCH irrespective of the MS status. The uplink GPRS TBF that uses the PDCH as the control channel is also released. When the MS is in transmission state and the uplink GPRS TBF exists, the BSC releases the uplink GPRS TBF that uses the channel as the control channel if the channel assigned to the MS is preempted and thus no channel is available for the uplink GPRS TBF. Figure 1 shows the procedure of abnormal release of the uplink GPRS TBF when the channel is preempted. Each time the channel is preempted and thus the BSC abnormally releases the uplink GPRS TBF that uses the channel as the control channel (see measurement point A), the counter is incremented by one.
Formula
This is an original counter without involving any formula.