Measurement of Outgoing External Inter-Cell Handover Requests

Measurement Counter

H3300W:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_900

H3300X:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_1800

H3300Y:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_1800

H3300Z:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_900

H3307W:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_900_900

H3307X:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_1800_1800

H3307Y:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_900_1800

H3307Z:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_1800_900

H3308W:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_900_900

H3308X:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_1800_1800

H3308Y:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_900_1800

H3308Z:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_1800_900

H3301W:CELL_INTERBSC_OUTCELL_HO_REQ_DR_900_900

H3301X:CELL_INTERBSC_OUTCELL_HO_REQ_DR_1800_1800

H3301Y:CELL_INTERBSC_OUTCELL_HO_REQ_DR_900_1800

H3301Z:CELL_INTERBSC_OUTCELL_HO_REQ_DR_1800_900

H330A:CELL_INTERBSC_OUTCELL_HO_REQ_UL_QLTY

H330B:CELL_INTERBSC_OUTCELL_HO_REQ_DL_QLTY

H330C:CELL_INTERBSC_OUTCELL_HO_REQ_UL_RXL

H330D:CELL_INTERBSC_OUTCELL_HO_REQ_DL_RXL

H330E:CELL_INTERBSC_OUTCELL_HO_REQ_TA

H330F:CELL_INTERBSC_OUTCELL_HO_REQ_BETTER_CELL

H330G:CELL_INTERBSC_OUTCELL_HO_REQ_LOAD

H330H:CELL_INTERBSC_OUTCELL_HO_REQ_RAPID_LEV_DROP

H330I:CELL_INTERBSC_OUTCELL_HO_REQ_MSC_INTERVENTION

H330J:CELL_INTERBSC_OUTCELL_HO_REQ_OM_INTERVENTION

H330L:CELL_INTERBSC_OUTCELL_HO_REQ_OTHER

H3303:CELL_INTERBSC_OUTCELL_HO_REQ_DIFFERENT_SIG_POINT

H333a:CELL_INTERBSC_OUTCELL_HO_REQ_BSC_LOO

H333b:CELL_INTERBSC_OUTCELL_HO_REQ_BTS_LOO

Description

The BSC decides whether to initiate a handover based on the MR and the handover algorithm. If the originating cell and the target cell are controlled by the same BSC, an internal inter-cell handover is initiated. The specific counter provides the number of outgoing external inter-cell handover requests in the originating cell initiated by the BSC based on the handover algorithm. Together with the Outgoing External Inter-Cell Handover Commands and the Failed Outgoing External Inter-Cell Handovers, this counter determines the outgoing external inter-cell handover performance.

The following counters provide the numbers of outgoing external inter-cell handover requests initiated by the BSC based on the handover algorithm (excluding directed retry) when the handover occurs between the frequency bands as listed in Table 1. The target channel for handover can be SDCCH, TCHF, or TCHH. They are measured when the outgoing external inter-cell handover is initiated.

H3300W:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_900
H3300X:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_1800
H3300Y:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_1800
H3300Z:CELL_INTERBSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_900
H3307W:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_900_900
H3307X:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_1800_1800
H3307Y:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_900_1800
H3307Z:CELL_INTERBSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDEDR_1800_900
H3308W:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_900_900
H3308X:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_1800_1800
H3308Y:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_900_1800
H3308Z:CELL_INTERBSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDEDR_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 following counters provide the numbers of outgoing internal inter-cell handover requests during directed retry when the originating cell and the target cell are under control of different BSCs and the handover occurs between the frequency bands as listed in Table 1. They are measured when the outgoing internal inter-cell handover is initiated during directed retry.

H3301W:CELL_INTERBSC_OUTCELL_HO_REQ_DR_900_900
H3301X:CELL_INTERBSC_OUTCELL_HO_REQ_DR_1800_1800
H3301Y:CELL_INTERBSC_OUTCELL_HO_REQ_DR_900_1800
H3301Z:CELL_INTERBSC_OUTCELL_HO_REQ_DR_1800_900

The following counters provide the numbers of outgoing external inter-cell handover requests initiated by the BSC using BQ handover algorithm based on the UL or DL receive quality in the MR. They are measured when the outgoing external inter-cell handover is initiated.

H330A:CELL_INTERBSC_OUTCELL_HO_REQ_UL_QLTY
H330B:CELL_INTERBSC_OUTCELL_HO_REQ_DL_QLTY

NOTE:

The receive quality is evaluated with bit error ratio (BER), and the radio link quality is evaluated with the quality level in the MR. A high BER may be attributed to an excessively low signal level or channel interference.

BQ handover algorithm is for emergency handover based on the uplink or downlink receive quality over the Um interface. If uplink quality rank is greater than or equal to the UL Qual. Threshold, the BQ handover is initiated because of bad uplink quality. If downlink quality rank is greater than or equal to the DL Qual. Threshold, the BQ handover is initiated because of bad downlink quality.

The following counters provide the numbers of outgoing external inter-cell handover requests initiated by the BSC using BQ handover algorithm based on the UL or DL receive level in the MR. They are measured when the outgoing external inter-cell handover is initiated.

H330C:CELL_INTERBSC_OUTCELL_HO_REQ_UL_RXL
H330D:CELL_INTERBSC_OUTCELL_HO_REQ_DL_RXL

Note: Edge handover algorithm is used to determine whether to initiate a handover based on the uplink or downlink receive level over the Um interface. If the uplink receive level is smaller than the Edge HO UL RX_LEV Threshold, the edge handover is initiated because of the low uplink level. If the downlink receive level is smaller than the Edge HO DL RX_LEV Threshold, the edge handover is initiated because of the low downlink level.

The following counter provides the number of outgoing external inter-cell handover requests initiated by the BSC using TA handover algorithm based on the TA value in the MR. It is measured when the outgoing external inter-cell handover is initiated.

H330E:CELL_INTERBSC_OUTCELL_HO_REQ_TA

NOTE:

TA for a common cell: 0-63; TA for a underlaid subcell in a dual-timeslot extended cell: 0-229. If there are 63 bits and each bit step is 553.5 m, the distance is 35 km.

TA handover algorithm is for emergency handover based on the TA value reported by the BTS. If the TA value is greater than the TA Threshold, a TA handover is initiated.

The following counter provides the number of outgoing external inter-cell handover requests initiated by the BSC based on the MRs using algorithms such as power budget handover (PBGT), inter-layer handover (better cell), and better 3G cell handover. It is measured when the outgoing external inter-cell handover is initiated.

H330F:CELL_INTERBSC_OUTCELL_HO_REQ_BETTER_CELL

NOTE:

PBGT handover algorithm is used to decide whether to initiate a handover to a valid cell with a lower path loss.

Inter-layer (better cell) handover algorithm is used to decide whether to initiate a handover to a cell which is on a lower layer than the serving cell and whose downlink level is greater than the Inter-layer HO Threshold.

Better 3G cell handover algorithm is used to determine whether to initiate a handover based on the measurement object. If the measurement object is RSCP and the measured result is greater than the RSCP Threshold for Better 3G Cell HO, or if the measurement object is Ec/No and the measured result is greater than the Ec/NO Threshold for Better 3G Cell HO, then a handover to a 3G better cell is initiated.

The following counter provides the number of outgoing external inter-cell handover requests initiated by the BSC using load handover algorithm based on the load condition on the serving cell. It is measured when the outgoing external inter-cell handover is initiated.

H330G:CELL_INTERBSC_OUTCELL_HO_REQ_LOAD

Note: Load handover algorithm is used to decide whether to initiate a handover based on the load conditions on the serving cell and the neighboring cell. If the system signaling flow is smaller than the System Flux Threshold for Load HO, the load on the serving cell is greater than the Load HO Threshold and the load on the target cell is smaller than the Load Req.on Candidate Cell, a load handover is initiated.

The following counter provides the number of outgoing external inter-cell handover requests initiated by the BSC using the rapid lever drop algorithm based on the MRs. It is measured when the outgoing external inter-cell handover is initiated.

H330H:CELL_INTERBSC_OUTCELL_HO_REQ_RAPID_LEV_DROP

Note: Rapid lever drop algorithm is used to decide whether to initiate a handover based on the downlink receive level in the measurement report. When the drop slope of the downlink receive level meets the specified threshold, a rapid lever drop handover is initiated.

The following counter provides the numbers of outgoing external inter-cell handover requests initiated by the BSC based on the HANDOVER CANDIDATE ENQUIRE message received from the MSC. It is measured when the outgoing external inter-cell handover is initiated.

H330I:CELL_INTERBSC_OUTCELL_HO_REQ_MSC_INTERVENTION

Note: After receiving the HANDOVER CANDIDATE ENQUIRE message from the MSC, the BSC instructs proper MSs in the source cell to perform forced handover, based on the originating cell ID and the number of MSs to perform handovers contained in that message. The MSs that are forced to perform handover are as many as the specified number of MSs contained in the message.

The following counter provides the number of outgoing external inter-cell handover requests initiated manually by the the maintenance personnel from the maintenance terminal. It is measured when the BSC initiates the outgoing external inter-cell handover based on the handover algorithm after receiving the maintenance command requesting for outgoing external inter-cell handover.

H330J:CELL_INTERBSC_OUTCELL_HO_REQ_OM_INTERVENTION

If a BSC is configured with multiple signaling points, the procedure of handover between cells at different signaling points is identical with that of the external inter-cell handover.

The following counter provides the number of Outgoing External Inter-Cell Handover Requests (Different Signaling Points). It is measured when the outgoing external inter-cell handover is initiated when the originating cell and target cell are at different signaling points of the same BSC.

H3303:CELL_INTERBSC_OUTCELL_HO_REQ_DIFFERENT_SIG_POINT

When the BSC local switch is enabled, the calls that meet the BSC local switch conditions communicate using the BSC local switch, and those meet the BTS local switch conditions communicate using the BTS local switch.

The following counters provide the numbers of outgoing external inter-cell handover requests respectively from the calls using the BSC local switch and those using the BTS local switch. They are measured when the outgoing external inter-cell handover is initiated.

H333a:CELL_INTERBSC_OUTCELL_HO_REQ_BSC_LOOP
H333b:CELL_INTERBSC_OUTCELL_HO_REQ_BTS_LOOP

The following counter provides the number of outgoing external inter-cell handover requests due to other causes except the previous ones. It is measured when the outgoing external inter-cell handover is initiated based on the handover algorithm.

H330L:CELL_INTERBSC_OUTCELL_HO_REQ_OTHER

Unit

Integer number or integer.

Measurement Point

As shown in Figure 1 and Figure 2, the counter is measured at A when the BSC decides that an outgoing external inter-cell handover is required based on the measurement report.

Figure 1 Measurement of the counters related to outgoing external inter-cell handover (excluding directed retry)

A	Measurement point of Outgoing External Inter-Cell Handover Requests (Excluding Directed Retry)
B	Measurement point of Outgoing External Inter-Cell Handover Responses (Excluding Directed Retry)
C	Measurement point of Successful Outgoing External Inter-Cell Handovers (Excluding Directed Retry)

Figure 2 Measurement of the counters related to outgoing external inter-cell handover (directed retry)

A	Measurement point of Outgoing External Inter-Cell Handover Requests (Directed Retry)
B	Measurement point of Outgoing External Inter-Cell Handover Responses (Directed Retry)
C	Measurement point of Successful Outgoing External Inter-Cell Handovers (Directed Retry)

Formula

This is an original counter without involving any formula.