Attempted VGCS TCH Handovers for Timing Advance

Measurement Counter

A03502: CELL_GCC_HO_REQ_TA

Description

After the originating BSC makes the handover decision, the originating BSC analyzes the reason for the handover. This measurement provides the number of handovers for timing advance. Along with Successful VGCS TCH Handovers for Timing Advance, this measurement reflects the performance of the handovers for timing advance.

Unit

Integer number or integer.

Measurement Point

The measurement point is specified in the following three situations:

(1) In the case of the intra-cell handover, this counter is incremented by one when the originating BSC sends a HANDOVER REQUIRED message to the MSC for timing advance. The measurement point is A, as shown in Figure 1.
(2) In the case of the inter-cell handover, this counter is incremented by one when the BSC determines to initiate the internal inter-cell handover based on the measurement report for timing advance. The measurement point is A, as shown in Figure 1.
(3) In the case of the inter-BSC handover, this counter is incremented by one when the originating BSC sends a HANDOVER_REQUIRD message to the MSC for timing advance. The measurement point is A, as shown in Figure 1.

Figure 1 Group call intra-cell handover procedure

Figure 2 Group call inter-cell handover procedure

Figure 3 Group call outgoing inter-BSC handover procedure

Formula

This is an original counter without involving any formula.