Measurement Counter
A9001:UP_GPRS_TBF_ESTB_ATMPT
Description
This measurement provides the number of uplink GPRS TBF establishment attempts in a granularity period. Together with Number of Failed Uplink GPRS TBF Establishments due to No Channel 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. Together with Number of Successful Uplink GPRS TBF Establishments, this measurement indicates the uplink assignment success rate in a granularity period. Together with other measurements, this measurement indicates the PDCH packet assignment success rate in a granularity period.
Unit
Integer number or integer.
Measurement Point
Uplink GPRS TBF establishment using one phase access
The MS initiates the one phase access procedure by sending a CHANNEL REQUEST message on the RACH. Figure 1 shows the one phase access procedure initiated by the MS. Each time the BSC receives a CHANNEL REQUEST message from the MS indicating one phase access (see measurement point A), the counter is incremented by one.
Figure 1 One phase packet access request received on the RACH
Uplink GPRS TBF establishment using single block access
The MS generally establishes the uplink GPRS TBF using one phase access procedure until the BSC sends an IMMEDIATE ASSIGNMENT message instructing the MS to use the single block access procedure. This message contains the single block packet assignment construction or multiblock packet assignment construction. Figure 2 shows the procedure of the uplink GPRS TBF establishment using single block access. When sending the IMMEDIATE ASSIGNMENT message, the BSC reserves the corresponding radio resources on the PS service channel for the MS to respond with a PACKET RESOURCE REQUEST message. Each time the BSC receives a PACKET RESOURCE REQUEST message from the MS indicating the use of single block access for uplink GPRS TBF establishment (see measurement point C), the counter is incremented by one.
Figure 2 Single block packet access request received on the RACH
Uplink TBF establishment in a downlink GPRS TBF
The MS can initiate an uplink GPRS TBF establishment request in a downlink GPRS TBF by attaching the Channel Request information element to the PACKET DOWNLINK ACK/NACK message. The PACKET DOWNLINK ACK/NACK message is triggered by the transmission request from the LLC PDU. Figure 3 shows the procedure in which the MS sends the PACKET DOWNLINK ACK/NACK message containing the Channel Request information element. Each time the BSC receives an uplink GPRS TBF establishment request message from the MS (see measurement point A), the counter is incremented by one.
Figure 3 Uplink TBF establishment in a downlink TBF
Formula
This is an original counter without involving any formula.