Measurement of Outgoing Internal Inter-Cell Handover Requests

Measurement Counter

H3100W:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_900

H3100X:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_1800

H3100Y:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_1800

H3100Z:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_900

H3107W:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_900_900

H3107X:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_1800_1800

H3107Y:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_900_1800

H3107Z:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_1800_900

H3108W:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_900_900

H3108X:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_1800_1800

H3108Y:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_900_1800

H3108Z:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_1800_900

H3101W:CELL_INTRABSC_OUTCELL_HO_REQ_DR_900_900

H3101X:CELL_INTRABSC_OUTCELL_HO_REQ_DR_1800_1800

H3101Y:CELL_INTRABSC_OUTCELL_HO_REQ_DR_900_1800

H3101Z:CELL_INTRABSC_OUTCELL_HO_REQ_DR_1800_900

H310A:CELL_INTRABSC_OUTCELL_HO_REQ_UL_QLTY

H310B:CELL_INTRABSC_OUTCELL_HO_REQ_DL_QLTY

H310C:CELL_INTRABSC_OUTCELL_HO_REQ_UL_RXL

H310D:CELL_INTRABSC_OUTCELL_HO_REQ_DL_RXL

H310E:CELL_INTRABSC_OUTCELL_HO_REQ_TA

H310F:CELL_INTRABSC_OUTCELL_HO_REQ_BETTER_CELL

H310G:CELL_INTRABSC_OUTCELL_HO_REQ_LOAD

H310H:CELL_INTRABSC_OUTCELL_HO_REQ_RAPID_LEV_DROP

H310M:CELL_INTRABSC_OUTCELL_HO_REQ_DUBAND_OUTTER_INNER

H310N:CELL_INTRABSC_OUTCELL_HO_REQ_DUBAND_INNER_OUTTER

H310O:CELL_INTRABSC_OUTCELL_HO_REQ_DUBAND_INNER_USER_MOVE

H310I:CELL_INTRABSC_OUTCELL_HO_REQ_MSC_INTERVENTION

H310J:CELL_INTRABSC_OUTCELL_HO_REQ_OM_INTERVENTION

H310L:CELL_INTRABSC_OUTCELL_HO_REQ_OTHER

H370a:CELL_INTRABSC_OUTCELL_HO_REQ_BSC_LOOP

H370b:CELL_INTRABSC_OUTCELL_HO_REQ_BTS_LOOP

Description

The BSC decides whether to initiate a handover based on the MR and the handover algorithm. If the originating cell (serving 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 internal inter-cell handover requests initiated by the BSC in the originating cell. Together with the Outgoing Internal Inter-Cell Handover Commands and the Failed Outgoing Internal Inter-Cell Handovers, this counter determines the outgoing internal inter-cell handover performance. Together with the counters related to the incoming internal inter-cell handovers, this counter determines the internal inter-cell handover performance.

The following counters provide the numbers of outgoing internal 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 MS may be on the SDCCH, TCHF, or TCHH before the handover.
  • H3100W:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_900
  • H3100X:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_1800
  • H3100Y:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_900_1800
  • H3100Z:CELL_INTRABSC_OUTCELL_HO_REQ_SD_NOT_INCLUDE_DR_1800_900
  • H3107W:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_900_900
  • H3107X:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_1800_1800
  • H3107Y:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_900_1800
  • H3107Z:CELL_INTRABSC_OUTCELL_HO_REQ_TCHF_NOT_INCLUDE_DR_1800_900
  • H3108W:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_900_900
  • H3108X:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_1800_1800
  • H3108Y:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_900_1800
  • H3108Z:CELL_INTRABSC_OUTCELL_HO_REQ_TCHH_NOT_INCLUDE_DR_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 initiated by the BSC during directed retry when the originating cell and the target cell are under control of the same BSC and the handover occurs between the frequency bands as listed in Table 1.
  • H3101W:CELL_INTRABSC_OUTCELL_HO_REQ_DR_900_900
  • H3101X:CELL_INTRABSC_OUTCELL_HO_REQ_DR_1800_1800
  • H3101Y:CELL_INTRABSC_OUTCELL_HO_REQ_DR_900_1800
  • H3101Z:CELL_INTRABSC_OUTCELL_HO_REQ_DR_1800_900
The following counters provide the numbers of outgoing internal inter-cell handover requests initiated based on various handover algorithms. They are measured when the outgoing internal inter-cell handover is initiated.
  • The following counters provide the numbers of outgoing internal inter-cell handover requests initiated by the BSC using BQ handover algorithm based on the UL and DL receive quality in the MR. They are measured when the outgoing internal inter-cell handover is initiated.
    • H310A:CELL_INTRABSC_OUTCELL_HO_REQ_UL_QLTY
    • H310B:CELL_INTRABSC_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 UL/DL 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.

    If no measurement report is received from the MS for a long time, the BSC deems that the uplink receive quality is bad, and thus initiates a BQ handover.

  • The following counters provide the numbers of outgoing internal 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 internal inter-cell handover is initiated.
    • H310C:CELL_INTRABSC_OUTCELL_HO_REQ_UL_RXL
    • H310D:CELL_INTRABSC_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 internal 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 internal inter-cell handover is initiated.
    • H310E:CELL_INTRABSC_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 internal 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 internal inter-cell handover is initiated.
    • H310F:CELL_INTRABSC_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 internal 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 internal inter-cell handover is initiated.
    • H310G:CELL_INTRABSC_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 internal inter-cell handover requests initiated by the BSC using the rapid lever drop algorithm based on the MRs. It is measured when the outgoing internal inter-cell handover is initiated.
    • H310H:CELL_INTRABSC_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 counters provides the numbers of outgoing internal inter-cell handover requests based on the algorithms for enhanced dual-band network handover and the measurement report. They are measured when the outgoing internal inter-cell handover is initiated.
    • H310M:CELL_INTRABSC_OUTCELL_HO_REQ_DUBAND_OUTTER_INNER is measured when the outgoing internal inter-cell handover is initiated due to high load in the underlaid subcell.
    • H310N:CELL_INTRABSC_OUTCELL_HO_REQ_DUBAND_INNER_OUTTER is measured when the outgoing internal inter-cell handover is initiated based on due to low load in the underlaid subcell.
    • H310O:CELL_INTRABSC_OUTCELL_HO_REQ_DUBAND_INNER_USER_MOVE is measured when the outgoing internal inter-cell handover is initiated due to call movement in the overlaid subcell.
    NOTE:
    The handovers in the enhanced dual-band network include:
    • (1) Handover due to high load in the underlaid subcell
      Based on the loading conditions in the overlaid and underlaid subcells, the downlink receive level in the measurement report and system flux in the measurement report, such a handover is initiated when the following conditions are met.
      • The load in the underlaid subcell is higher than the UL Subcell General Overload Threshold.
      • The load in the overlaid subcell is lower than the Inner Cell Serious OverLoad Thred.
      • The system flux is no higher than Allowed Flow Control Level of UL And OL Subcell HO.
      • The current call is within the handover band that allows handover.
    • (2) Handover due to low load in the underlaid subcell
      Based on the load in the underlaid subcell, the downlink receive level and system flux in the MRs, such a handover is initiated when the following conditions are met:
      • The load in the underlaid subcell is lower than the UL Subcell Lower Load Threshold.
      • The system flux is no higher than Allowed Flow Control Level of UL And OL Subcell HO.
      • The current call is within the handover band that allows handover.
    • (3) Handover due to call movement in the overlaid subcell
      Based on the load in the underlaid subcell, the downlink receive level and system flux in the MRs, such a handover is initiated when the following conditions are met:
      • The downlink receive level in the underlaid subcell is lower than the Outgoing OL Subcell HO level Threshold.
      • The difference of the downlink receive level between the overlaid subcell and the neighbor cell is lower than the Distance Between Boudaries of UL And OL Subcells (dB) and the Distance Hysterisis Between Boudaries of UL And OL Subcells (dB).
  • The following counter provides the numbers of outgoing internal 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 internal inter-cell handover is initiated.
    • H310I:CELL_INTRABSC_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 internal inter-cell handover requests initiated manually by the the maintenance personnel from the maintenance terminal. It is measured when the BSC initiates the outgoing internal inter-cell handover based on the handover algorithm after receiving the maintenance command requesting for outgoing internal inter-cell handover.
    • H310J:CELL_INTRABSC_OUTCELL_HO_REQ_OM_INTERVENTION
  • 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 internal 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 internal inter-cell handover is initiated.
    • H370a:CELL_INTRABSC_OUTCELL_HO_REQ_BSC_LOOP
    • H370b:CELL_INTRABSC_OUTCELL_HO_REQ_BTS_LOOP
  • The following counter provides the number of outgoing internal inter-cell handover requests due to other causes except the previous ones. It is measured when the outgoing internal inter-cell handover is initiated based on the handover algorithm. These other causes may be interference handover, directed retry handover, fast moving handover.
    • H310L:CELL_INTRABSC_OUTCELL_HO_REQ_OTHER

Unit

Integer number or integer.

Measurement Point

As shown in Figure 1, the specific counter is measured at A when an outgoing internal inter-cell handover is initiated in stable state by the BSC based on the measurement report.

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

A

Measurement point of Outgoing Internal Inter-Cell Handover Requests (Excluding Directed Retry)

B

Measurement point of Outgoing Internal Inter-cell Handover Commands (Excluding Directed Retry)

C

Measurement point of Outgoing Internal Inter-Cell Handover Detection (Excluding Directed Retry)

D

Measurement point of Successful Outgoing Internal Inter-Cell Handovers (Excluding Directed Retry)

As shown in Figure 2, the specific counter is measured at A when the BSC decides the directed retry procedure is required during the assignment procedure and initiates an outgoing internal inter-cell handover based on the measurement report.

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

A

Measurement point of Outgoing Internal Inter-Cell Handover Requests (Directed Retry)

B

Measurement point of Outgoing Internal Inter-Cell Handover Commands (Directed Retry)

C

Measurement point of Successful Outgoing Internal Inter-Cell Handovers (Directed Retry)

D

Measurement point of Successful Outgoing Internal Inter-Cell Handovers (Directed Retry)

Formula

This is an original counter without involving any formula.

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