Number of Downlink GPRS TBF Abnormal Releases due to FLUSH

Measurement Counter

A9108:DOWN_GPRS_TBF_ABNORM_REL_FLUSH

Description

This measurement provides the number of downlink GPRS TBF abnormal releases due to cell flush in a granularity period. A high measurement value is yielded because the cell reselection procedure is frequently initiated by the MS. In this case, the planning of radio network environment is required.

Unit

Integer number or integer.

Measurement Point

When the MS reselects a new cell, the SGSN initiates the cell updating procedure and sends a FLUSH LL PDU to the BSC. Accordingly, the BSC suspends all the PS services of the MS in the original cell irrespective of the MS status. When the MS is in transmission state and the downlink GPRS TBF exists, the BSC releases the downlink GPRS TBF if the BSC receives the FLUSH LL PDU from the SGSN. Figure 1 shows the procedure in which the BSC abnormally releases the downlink GPRS TBF upon receipt of an FLUSH LL PDU. Each time the BSC receives the FLUSH LL PDU message (see measurement point A), the counter is incremented by one.

Figure 1 Abnormal release of the downlink GPRS TBF due to FLUSH

Formula

This is an original counter without involving any formula.