Measurement of Incoming External Inter-Cell Handover Requests

Measurement Counter

H3400W:CELL_INTERBSC_INCELL_HO_REQ_SD_900_900

H3400X:CELL_INTERBSC_INCELL_HO_REQ_SD_1800_1800

H3400Y:CELL_INTERBSC_INCELL_HO_REQ_SD_900_1800

H3400Z:CELL_INTERBSC_INCELL_HO_REQ_SD_1800_900

H3409W:CELL_INTERBSC_INCELL_HO_REQ_TCH_900_900

H3409X:CELL_INTERBSC_INCELL_HO_REQ_TCH_1800_1800

H3409Y:CELL_INTERBSC_INCELL_HO_REQ_TCH_900_1800

H3409Z:CELL_INTERBSC_INCELL_HO_REQ_TCH_1800_900

H3401B:CELL_INTERBSC_INCELL_HO_REQ_TCHF_ONLY

H3401C:CELL_INTERBSC_INCELL_HO_REQ_TCHH_ONLY

H3401D:CELL_INTERBSC_INCELL_HO_REQ_TCHF_PREF_NOCHG

H3401E:CELL_INTERBSC_INCELL_HO_REQ_TCHH_PREF_NOCHG

H3401G:CELL_INTERBSC_INCELL_HO_REQ_TCHF_PREF_CHG

H3401H:CELL_INTERBSC_INCELL_HO_REQ_TCHH_PREF_CHG

H3401F:CELL_INTERBSC_INCELL_HO_REQ_TCH_NOCHG

H3401I:CELL_INTERBSC_INCELL_HO_REQ_TCH_CHG

CH346:CELL_INTERBSC_INCELL_HO_REQ_BETTER_CELL

Description

BSC determines whether to initiate the handover from the originating cell to the target cell through the handover algorithm. If the originating cell and the target cell are controlled by different BSCs, the external inter-cell handover is initiated. The specific counter provides the number of incoming external inter-cell handover requests based on the target cell under control of the target BSC. Together with the Incoming External Inter-Cell Handover Responses and the Failed Incoming External Inter-Cell Handovers, this counter determines the incoming external inter-cell handover performance.

The following counters provide the numbers of incoming external inter-cell handover requests initiated by other BSCs based on the handover algorithm. The MS may be seizing a the channel type (SDCCH/TCH) before the handover. The handover can be performed between the frequency bands as listed in Table 1. They are measured when the BSC receives the HO REQ message from the MSC.

H3400W:CELL_INTERBSC_INCELL_HO_REQ_SD_900_900
H3400X:CELL_INTERBSC_INCELL_HO_REQ_SD_1800_1800
H3400Y:CELL_INTERBSC_INCELL_HO_REQ_SD_900_1800
H3400Z:CELL_INTERBSC_INCELL_HO_REQ_SD_1800_900
H3409W:CELL_INTERBSC_INCELL_HO_REQ_TCH_900_900
H3409X:CELL_INTERBSC_INCELL_HO_REQ_TCH_1800_1800
H3409Y:CELL_INTERBSC_INCELL_HO_REQ_TCH_900_1800
H3409Z:CELL_INTERBSC_INCELL_HO_REQ_TCH_1800_900

**Table 1** Relations between counters and the frequency bands of the originating cell and the target cell
Frequency Band of the Originating Cell	Frequency Band of the Target Cell	Counter
GSM900, GSM900&DCS1800, GSM850, GSM850&DCS1800, GSM850&PCS1900	GSM900, GSM900&DCS1800, GSM850, GSM850&DCS1800, GSM850&PCS1900	900_900
GSM900, GSM900&DCS1800, GSM850, GSM850&DCS1800, GSM850&PCS1900	DCS1800, PCS1900	900_1800
DCS1800, PCS1900	GSM900, GSM900&DCS1800, GSM850, GSM850&DCS1800, GSM850&PCS1900	1800_900
DCS1800, PCS1900	DCS1800, PCS1900	1800_1800

The specific one of the following counters provides the number of incoming external inter-cell handover requests initiated by other BSCs based on the handover algorithm. When an HO REQ message is received from the MSC, the specific counter is measured based on the Channel Type IE contained in the HO REQ message. The following lists the eight types of Channel Type IE contained in the HO REQ message from the MSC and the corresponding counter to be measured:

TCHF only: H3401B:CELL_INTERBSC_INCELL_HO_REQ_TCHF_ONLY
TCHH only: H3401C:CELL_INTERBSC_INCELL_HO_REQ_TCHH_ONLY
TCHF preferred and channel type unchangeable: H3401D:CELL_INTERBSC_INCELL_HO_REQ_TCHF_PREF_NOCHG
TCHH preferred and channel type unchangeable: H3401E:CELL_INTERBSC_INCELL_HO_REQ_TCHH_PREF_NOCHG
TCHF preferred and channel type changeable: H3401G:CELL_INTERBSC_INCELL_HO_REQ_TCHF_PREF_CHG
TCHH preferred and channel type changeable: H3401H:CELL_INTERBSC_INCELL_HO_REQ_TCHH_PREF_CHG
TCHF or TCHH and channel type unchangeable: H3401F:CELL_INTERBSC_INCELL_HO_REQ_TCH_NOCHG
TCHF or TCHH and channel type changeable: H3401I:CELL_INTERBSC_INCELL_HO_REQ_TCH_CHG

The following counter provides the number of Incoming External Inter-Cell Handover Requests received from the MSC, which is initiated by other BSCs based on the Better Cell algorithm.

CH346:CELL_INTERBSC_INCELL_HO_REQ_BETTER_CELL

Unit

Integer number or integer.

Measurement Point

As shown in Figure 1, the counter is measured based on the target cell at A when the target BSC (BSC2) receives the HO REQ message from the MSC.

Figure 1 Measurement of the counters related to incoming external inter-cell handover

A	Measurement point of Incoming External Inter-Cell Handover Requests
B	Measurement point of Incoming External Inter-Cell Handover Responses
C	Measurement point of Incoming External Inter-Cell Handover Detection Messages Received by BSC
D	Measurement point of Successful Incoming External Inter-Cell Handovers

Formula

This is an original counter without involving any formula.