Measurement Counter
A9003:UP_GPRS_TBF_ESTB_FAIL_NO_CHAN_RES
Description
This measurement provides the number of failed uplink GPRS TBF establishments due to no channel in a granularity period. A high measurement value is yielded because radio channels of the cell are insufficient or faulty. Together with Number of Uplink GPRS TBF Establishment Attempts and Number of Uplink GPRS TBF Abnormal Releases due to No Channel, this measurement indicates the congestion of the uplink GPRS TBF due to no channel in a granularity period.
Unit
Integer number or integer.
Measurement Point
Failed uplink GPRS TBF establishment using one phase access due to no channel
After receiving a CHANNEL REQUEST message, the BSC sends an IMMEDIATE REJECT message on the CCCH to reject the access request from the MS if the uplink GPRS TBF cannot be established because no PDCH is available. Figure 1 shows the procedure in which the BSC rejects the channel request from the MS. Each time the BSC sends an IMMEDIATE REJECT message (see measurement point A), the counter is incremented by one.
Figure 1 Failed uplink GPRS TBF establishment using one phase access due to no channel
Failed uplink GPRS TBF establishment using single block access due to no channel
During the single block access procedure or when the MS requests the change of radio resource configuration, the BSC receives the PACKET RESOURCE REQUEST message from the MS. This message requests the establishment or re-establishment of the uplink GPRS TBF. If the uplink GPRS TBF cannot be established because no PDCH is available for uplink GPRS TBF establishment, the BSC sends a PACKET ACCESS REJECT message on the PACCH to reject the access request from the MS. Figure 2 shows the procedure in which the BSC rejects the uplink resource request from the MS. Each time the BSC sends a PACKET ACCESS REJECT message (see measurement point A), the counter is incremented by one.
Figure 2 Failed uplink GPRS TBF establishment using single block access due to no channel
Failed uplink GPRS TBF establishment on the PACCH due to no channel
When the BSC receives the PACKET DOWNLINK ACK/NACK message with the CHANNEL REQUEST information element from the MS, the BSC sends a PACKET ACCESS REJECT message on the PACCH to reject the access request from the MS if the uplink GPRS TBF cannot be established because no packet channel is available. Figure 3 shows the procedure in which the BSC rejects the uplink resource request from the MS. Each time the BSC sends a PACKET ACCESS REJECT message (see measurement point A), the counter is incremented by one.
Figure 3 Failed uplink GPRS TBF establishment on the PACCH due to no channel
Formula
This is an original counter without involving any formula.