Measurement of Outgoing External Inter-Cell Handover Commands

Measurement Counter

H3310W:CELL_INTERBSC_OUTCELL_HO_CMD_SD_NOT_INCLUDE_DR_900_900

H3310X:CELL_INTERBSC_OUTCELL_HO_CMD_SD_NOT_INCLUDE_DR_1800_1800

H3310Y:CELL_INTERBSC_OUTCELL_HO_CMD_SD_NOT_INCLUDE_DR_900_1800

H3310Z:CELL_INTERBSC_OUTCELL_HO_CMD_SD_NOT_INCLUDE_DR_1800_900

H3317W:CELL_INTERBSC_OUTCELL_HO_CMD_TCHF_NOT_INCLUDE_DR_900_900

H3317X:CELL_INTERBSC_OUTCELL_HO_CMD_TCHF_NOT_INCLUDE_DR_1800_1800

H3317Y:CELL_INTERBSC_OUTCELL_HO_CMD_TCHF_NOT_INCLUDE_DR_900_1800

H3317Z:CELL_INTERBSC_OUTCELL_HO_CMD_TCHF_NOT_INCLUDE_DR_1800_900

H3318W:CELL_INTERBSC_OUTCELL_HO_CMD_TCHH_NOT_INCLUDE_DR_900_900

H3318X:CELL_INTERBSC_OUTCELL_HO_CMD_TCHH_NOT_INCLUDE_DR_1800_1800

H3318Y:CELL_INTERBSC_OUTCELL_HO_CMD_TCHH_NOT_INCLUDE_DR_900_1800

H3318Z:CELL_INTERBSC_OUTCELL_HO_CMD_TCHH_NOT_INCLUDE_DR_1800_900

H3311W:CELL_INTERBSC_OUTCELL_HO_CMD_DR_900_900

H3311X:CELL_INTERBSC_OUTCELL_HO_CMD_DR_1800_1800

H3311Y:CELL_INTERBSC_OUTCELL_HO_CMD_DR_900_1800

H3311Z:CELL_INTERBSC_OUTCELL_HO_CMD_DR_1800_900

H331A:CELL_INTERBSC_OUTCELL_HO_CMD_UL_QLTY

H331B:CELL_INTERBSC_OUTCELL_HO_CMD_DL_QLTY

H331C:CELL_INTERBSC_OUTCELL_HO_CMD_UL_RXL

H331D:CELL_INTERBSC_OUTCELL_HO_CMD_DL_RXL

H331E:CELL_INTERBSC_OUTCELL_HO_CMD_TA

H331F:CELL_INTERBSC_OUTCELL_HO_CMD_BETTER_CELL

H331G:CELL_INTERBSC_OUTCELL_HO_CMD_LOAD

H331H:CELL_INTERBSC_OUTCELL_HO_CMD_RAPID_LEV_DROP

H331I:CELL_INTERBSC_OUTCELL_HO_CMD_MSC_INTERVENTION

H331J:CELL_INTERBSC_OUTCELL_HO_CMD_OM_INTERVENTION

H331L:CELL_INTERBSC_OUTCELL_HO_CMD_OTHER

H3313:CELL_INTERBSC_OUTCELL_HO_CMD_DIFFERENT_SIG_POINT

H331Aa:CELL_INTERBSC_OUTCELL_HO_CMD_BSC_LOOP

H371P:CELL_INTERBSC_OUTCELL_HO_CMD_BTS_LOOP

Description

After sending the HO RQD message to the MSC and receiving the HO RQD ACK message (contains the HO CMD message) from the MSC, the BSC sends the HO CMD message to the MS. The specific counter provides the number of outgoing external inter-cell handover commands sent by the BSC in the originating cell. Together with the Outgoing External Inter-Cell Handover Requests 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 commands initiated based on various handover algorithm, and are measured when the BSC sends the HO CMD message to the MS.

• The following counters provide the numbers of outgoing external inter-cell handover commands initiated by the BSC using BQ handover algorithm based on the UL or DL receive quality in the MR. They are measured when the BSC sends the HO CMD message to the MS.
  • H331A:CELL_INTERBSC_OUTCELL_HO_CMD_UL_QLTY
  • H331B:CELL_INTERBSC_OUTCELL_HO_CMD_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 commands initiated by the BSC using edge handover algorithm based on the UL or DL receive level in the measurement report. They are measured when the BSC sends the HO CMD message to the MS.
  • H331C:CELL_INTERBSC_OUTCELL_HO_CMD_UL_RXL
  • H331D:CELL_INTERBSC_OUTCELL_HO_CMD_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 counters provide the numbers of outgoing external inter-cell handover commands initiated by the BSC using TA handover algorithm based on the TA value in the measurement report. They are measured when the BSC sends the HO CMD message to the MS.
  • H331E:CELL_INTERBSC_OUTCELL_HO_CMD_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 commands initiated by the BSC based on the measurement reports using algorithms such as power budget handover (PBGT), inter-layer handover (better cell), and better 3G cell handover. It is measured when the BSC sends the HO CMD message to the MS.
  • H331F:CELL_INTERBSC_OUTCELL_HO_CMD_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 counters provide the numbers of outgoing external inter-cell handover commands initiated by the BSC using load handover algorithm based on the current load conditions in the serving cell. It is measured when the BSC sends the HO CMD message to the MS.
  • H331G:CELL_INTERBSC_OUTCELL_HO_CMD_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 counters provide the numbers of outgoing external inter-cell handover commands initiated by the BSC using rapid lever drop algorithm based on the measurement reports. It is measured when the BSC sends the HO CMD message to the MS.
  • H331H:CELL_INTERBSC_OUTCELL_HO_CMD_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 number of outgoing external inter-cell handover commands initiated by the BSC based on the HANDOVER CANDIDATE ENQUIRE message received from the MS. It is measured when the BSC sends the HO CMD message to the MS.
  • H331I:CELL_INTERBSC_OUTCELL_HO_CMD_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 commands initiated manually by the the maintenance personnel from the maintenance terminal. It is measured when the BSC sends the HO CMD message to the MS.
  • H331J:CELL_INTERBSC_OUTCELL_HO_CMD_OM_INTERVENTION
• The following counter provides the number of outgoing external inter-cell handover commands due to other causes except the previous ones. It is measured when the BSC sends the HO CMD message to the MS.
  • H331L:CELL_INTERBSC_OUTCELL_HO_CMD_OTHER
• 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 commands initiated when the originating cell and target cell are at different signaling points of the same BSC. It is measured when the BSC sends the HO CMD message to the MS.

  • 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 commands respectively from the calls using the BSC local switch and those using the BTS local switch. They are measured when the BSC sends the HO CMD message to the MS.

  • H331Aa:CELL_INTERBSC_OUTCELL_HO_CMD_BSC_LOOP
  • H371P:CELL_INTERBSC_OUTCELL_HO_CMD_BTS_LOOP

Unit

Integer number or integer.

Measurement Point

As shown in Figure 1 and ‏Figure 2, the counter is measured at B when the BSC sends the HO CMD message to the MS.

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.