Measurement of Failed Internal Intra-Cell Handovers

Measurement Counter

H3020: CELL_INTRACELL_HO_FAIL_SD

H3029: CELL_INTRACELL_HO_FAIL_TCH

H302H: CELL_INTRACELL_HO_FAIL_NO_SPEECH_VER

H302I: CELL_INTRACELL_HO_FAIL_CHACT_FAIL

H3020A: CELL_INTRACELL_HO_FAIL_CONG_SD

H3029A: CELL_INTRACELL_HO_FAIL_CONG_TCH

H302B: CELL_INTRACELL_HO_FAIL_APPLY_TRSL_FAIL

H302G: CELL_INTRACELL_HO_FAIL_A_INTERF_FAIL

H3020C: CELL_INTRACELL_HO_FAIL_EXP_SD

H3027Cb: CELL_INTRACELL_HO_FAIL_EXP_TCHF_SIG

H3028Cb: CELL_INTRACELL_HO_FAIL_EXP_TCHH_SIG

H3027Ca: CELL_INTRACELL_HO_FAIL_EXP_TCHF_TRAF

H3028Ca: CELL_INTRACELL_HO_FAIL_EXP_TCHH_TRAF

H302Da: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_UNSPEC

H302Db: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_CH_UNAC

H302Dc: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_TM_EXP

H302Dd: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_NO_ACT

H302De: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_PREEMPT_RLS

H302Df: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_HO_IMPSBL_TA

H302Dg: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_NO_CH_MODEL

H302Dh: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_FREQ_NOT_IMP

H302Di: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_CALL_CLR

H302Dj: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_SMN_INCRCT_MSG

H302Dk: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_INVLID_MAN_INFO

H302Dl: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_MSG_TYPE_NONEXT

H302Dm: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_MSG_TYPE_NOT_CM

H302Dn: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_CDT_IE_ERR

H302Do: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_NO_CELL_ALLOC

H302Dp: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_PTCL_ERR_UNSPEC

H302Dq: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_OTHER

H3022A: CELL_INTRACELL_HO_FAIL_CONG_ULCELL_OLCELL

H3021A: CELL_INTRACELL_HO_FAIL_CONG_OLCELL_ULCELL

H3022M: CELL_INTRACELL_HO_FAIL_OTHERS_ULCELL_OLCELL

H3021M: CELL_INTRACELL_HO_FAIL_OTHERS_OLCELL_ULCELL

H3023A: CELL_INTRACELL_HO_FAIL_TCHF_TCHH

H3023B: CELL_INTRACELL_HO_FAIL_TCHH_TCHF

H3024A: CELL_INTRACELL_HO_FAIL_TCH_SD

H3024B: CELL_INTRACELL_HO_FAIL_SD_TCH

H302E: CELL_INTRACELL_HO_FAIL_NO_IDLE_ABIS

H302a: CELL_INTRACELL_HO_FAIL_BSC_LOOP

H302: CELL_INTRACELL_HO_FAIL_BTS_LOOP

H3025A: CELL_INTRACELL_HO_FAIL_AMR_TCHF_TCHH

H3025B: CELL_INTRACELL_HO_FAIL_AMR_TCHH_TCHF

Description

The counters are used to measure the numbers of failed internal intra-cell handovers based on the type of the channel the MS seizes, the handover failure cause, and the handover reason. They can be combined with the Internal Intra-Cell Handover Requests and the Internal Intra-Cell Handover Commands to reflect the performance of internal intra-cell handovers.

The counter H3020 indicates the number of failed internal intra-cell handovers when the target channel is an SDCCH. The counter H3029 indicates the number of failed internal intra-cell handovers when the target channel is a TCH. They cover the number of failed internal intra-cell handovers due to various reasons.
  • H3020: CELL_INTRACELL_HO_FAIL_SD
  • H3029: CELL_INTRACELL_HO_FAIL_TCH
The following problems can cause an internal intra-cell handover failure:
  • 1.Resource allocation
    • No traffic channel is available.
    • No Abis resource is available.
    • The requested speech version is unavailable.
    • The terrestrial resource fails to be obtained.
  • 2.Air interface access
    • The MS fails to access the new channel and then reconnects to the old channel.
    • The timer for the BSC to wait for an HO CMP message expires.
  • 3.Exceptions
    • The A interface is faulty.
    • The channel fails to be activated.
The following counters indicate the numbers of failed internal intra-cell handovers based on various handover failure causes.
  • The following counters indicate the numbers of failed internal intra-cell handovers due to the allocation failure of resources.

    • H3020A: CELL_INTRACELL_HO_FAIL_CONG_SD

      H3029A: CELL_INTRACELL_HO_FAIL_CONG_TCH

      The counter H3020A provides the number of failed internal intra-cell handovers due to no available SDCCH in the target cell (current cell) when the target channel is an SDCCH. The counter H3029A provides the number of failed internal intra-cell handovers due to no available TCH in the target cell (current cell) when the target channel is a TCH. The counter H3020A or H3029A is incremented by one when the target SDCCH or TCH fails to be assigned.

    • H302E: CELL_INTRACELL_HO_FAIL_NO_IDLE_ABIS

      The counter H302E provides the number of failed internal intra-cell handovers when the BSC enables the dynamic allocation of Abis resources but fails to allocate an Abis circuit in the target cell (current cell).

      H302H: CELL_INTRACELL_HO_FAIL_NO_SPEECH_VER

      The counter H302H provides the number of failed internal intra-cell handovers when the BSC cannot find a proper speech version after assigning a channel in the target cell (current cell).

    • H302B: CELL_INTRACELL_HO_FAIL_APPLY_TRSL_FAIL

      The counter H302B provides the number of failed internal intra-cell handovers when the BSC fails to obtain the requested circuit during the circuit connection process.

  • The following counters indicate the numbers of failed internal intra-cell handovers when the MS fails to access the new channel on the air interface.

    • H3020C: CELL_INTRACELL_HO_FAIL_EXP_SD

      H3027Cb: CELL_INTRACELL_HO_FAIL_EXP_TCHF_SIG

      H3028Cb: CELL_INTRACELL_HO_FAIL_EXP_TCHH_SIG

      H3027Ca: CELL_INTRACELL_HO_FAIL_EXP_TCHF_TRAF

      H3028Ca: CELL_INTRACELL_HO_FAIL_EXP_TCHH_TRAF

      In the internal intra-cell handover procedure, the BSC sends an HO CMD message to the MS after assigning a channel in the target cell (current cell) and successfully activating the channel and then starts a timer for waiting for an HO CMP message. The above counters provide the numbers of failed internal intra-cell handovers due to the expiry of the timer for waiting for an HO CMP message based on the target channel type and the service type (SDCCH, TCHF signaling channel, TCHH signaling channel, TCHF traffic channel, or TCHH traffic channel).

    • H302Da: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_UNSPEC

      H302Db: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_CH_UNAC

      H302Dc: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_TM_EXP

      H302Dd: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_NO_ACT

      H302De: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_PREEMPT_RLS

      H302Df: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_HO_IMPSBL_TA

      H302Dg: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_NO_CH_MODEL

      H302Dh: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_FREQ_NOT_IMP

      H302Di: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_CALL_CLR

      H302Dj: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_SMN_INCRCT_MSG

      H302Dk: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_INVLID_MAN_INFO

      H302Dl: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_MSG_TYPE_NONEXT

      H302Dm: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_MSG_TYPE_NOT_CM

      H302Dn: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_CDT_IE_ERR

      H302Do: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_NO_CELL_ALLOC

      H302Dp: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_PTCL_ERR_UNSPEC

      H302Dq: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_OTHER

      In the internal intra-cell handover procedure, the BSC sends an HO CMD message to the MS after assigning a channel in the target cell (current cell) and successfully activating the channel. The above counters provide the numbers of failed internal intra-cell handovers based on the handover failure reason reported by the MS when the MS fails to access the new channel and then reconnects to the old channel. The cause values for the MS to reconnect to the old channel after failing to access the new channel are as follows:
      • Abnormal release, unspecified
      • Abnormal release, channel unacceptable
      • Abnormal release, timer expired
      • Abnormal release, no activity on the radio path
      • Preemptive release 
      • Handover impossible, timing advance out of range
      • Channel mode unavailable 
      • Frequency not implemented 
      • Call already cleared 
      • Semantically incorrect message 
      • Invalid mandatory information 
      • Message type non-existent or not implemented 
      • Message type not compatible with protocol state 
      • Conditional IE error 
      • Cell allocation available 
      • Protocol error unspecified 
      • Other
  • The following counters indicate the numbers of failed internal intra-cell handovers due to the abnormality of devices.
    • H302G: CELL_INTRACELL_HO_FAIL_A_INTERF_FAIL

      The counter H302G provides the number of failed internal intra-cell handovers when the BSC locally releases the call after receiving an SS7 link abnormality indication in the internal intra-cell handover procedure.

    • H302I: CELL_INTRACELL_HO_FAIL_CHACT_FAIL

      The counter H302I provides the number of failed internal intra-cell handovers when the channel assigned by the BSC in the target cell (current cell) fails to be activated.

The following counters indicate the numbers of failed internal intra-cell handovers based on various handover reasons.
  • The following counters indicate the numbers of failed internal intra-cell handovers when the handover reason is a handover from the overlay of a concentric cell to the underlay of the concentric cell or from the underlay of a concentric cell to the overlay of the concentric cell.

    • H3022A: CELL_INTRACELL_HO_FAIL_CONG_ULCELL_OLCELL

      H3021A: CELL_INTRACELL_HO_FAIL_CONG_OLCELL_ULCELL

      The counter H3022A provides the number of failed internal intra-cell handovers when a handover from the underlay of a concentric cell to the overlay of the concentric cell fails because no available channel is available when the BSC attempts to assign a channel in the target cell (current cell). The counter H3021A provides the number of failed internal intra-cell handovers when a handover from the overlay of a concentric cell to the underlay of the concentric cell fails because no available channel is available when the BSC attempts to assign a channel in the target cell (current cell). Each time an internal intra-cell handover fails because of the channel assignment failure, the counter H3022A or H3021A is incremented by one.

    • H3022M: CELL_INTRACELL_HO_FAIL_OTHERS_ULCELL_OLCELL

      H3021M: CELL_INTRACELL_HO_FAIL_OTHERS_OLCELL_ULCELL

      The counter H3022M provides the number of failed internal intra-cell handovers when a handover from the underlay of a concentric cell to the overlay of the concentric cell fails due to other reasons than no available channel. The counter H3021M provides the number of failed internal intra-cell handovers when a handover from the overlay of a concentric cell to the underlay of the concentric cell fails due to other reasons than no available channel.

  • The counter H3023A indicates the number of failed internal intra-cell handovers when the handover reason is a TCHF-TCHH conversion. The counter H3023B indicates the number of failed internal intra-cell handovers when the handover reason is a TCHH-TCHF conversion.
    • H3023A: CELL_INTRACELL_HO_FAIL_TCHF_TCHH
    • H3023B: CELL_INTRACELL_HO_FAIL_TCHH_TCHF
  • The counter H3024A indicates the number of failed internal intra-cell handovers when the handover reason is a TCH-SDCCH conversion. The counter H3024B indicates the number of failed internal intra-cell handovers when the handover reason is an SDCCH-TCH conversion.
    • H3024A: CELL_INTRACELL_HO_FAIL_TCH_SD
    • H3024B: CELL_INTRACELL_HO_FAIL_SD_TCH
  • The counter H302a indicates the number of failed internal intra-cell handovers when the handover reason is the local switching of the BSC. The counter H302 indicates the number of failed internal intra-cell handovers when the handover reason is the local switching of the BTS.
    • H302a: CELL_INTRACELL_HO_FAIL_BSC_LOOP
    • H302: CELL_INTRACELL_HO_FAIL_BTS_LOOP
  • The counter H3025A indicates the number of failed internal intra-cell handovers when the handover reason is a TCHF-TCHH conversion for an AMR call. The counter H3025B indicates the number of failed internal intra-cell handovers when the handover reason is a TCHH-TCHF conversion for an AMR call.
    • H3025A: CELL_INTRACELL_HO_FAIL_AMR_TCHF_TCHH
    • H3025B: CELL_INTRACELL_HO_FAIL_AMR_TCHH_TCHF

Unit

Integer number or integer.

Measurement Point

Figure 1 shows the measurement points of the counters of Failed Intra-Cell Handovers per Cell.

Figure 1 Failed intra-cell handover

  • As shown in Figure 1, each time the internal intra-cell handover fails when no channel is available, the BSC cannot find a proper speech version, or no Abis resources are available (see measurement point A), one of the following counters is incremented by one.
    • H3020A: CELL_INTRACELL_HO_FAIL_CONG_SD
    • H3029A: CELL_INTRACELL_HO_FAIL_CONG_TCH
    • H3022A: CELL_INTRACELL_HO_FAIL_CONG_ULCELL_OLCELL
    • H3021A: CELL_INTRACELL_HO_FAIL_CONG_OLCELL_ULCELL
    • H302H: CELL_INTRACELL_HO_FAIL_NO_SPEECH_VER
    • H302E: CELL_INTRACELL_HO_FAIL_NO_IDLE_ABIS
  • As shown in Figure 1, each time the internal intra-cell handover fails when no circuit is available, the circuit connection fails, or the assigned channel fails to be activated (see measurement point B), one of the following counters is incremented by one.
    • H302B: CELL_INTRACELL_HO_FAIL_APPLY_TRSL_FAIL
    • H302I: CELL_INTRACELL_HO_FAIL_CHACT_FAIL
  • As shown in Figure 1, the BSC starts a timer for waiting for an HO CMP message after sending an HO CMD message in the internal intra-cell handover procedure. Each time the timer expires (see measurement point C), one of the following counters is incremented by one.
    • H3020C: CELL_INTRACELL_HO_FAIL_EXP_SD
    • H3027Cb: CELL_INTRACELL_HO_FAIL_EXP_TCHF_SIG
    • H3028Cb: CELL_INTRACELL_HO_FAIL_EXP_TCHH_SIG
    • H3027Ca: CELL_INTRACELL_HO_FAIL_EXP_TCHF_TRAF
    • H3028Ca: CELL_INTRACELL_HO_FAIL_EXP_TCHH_TRAF
  • As shown in Figure 1, the MS attempts to access the new channel after the BSC sends an HO CMD message to the MS in the internal intra-cell handover procedure. Each time the MS reconnects to the old channel after failing to access the new channel and the BSC receives an HO FAIL message from the MS (see measurement point D), one of the following counters is incremented by one.
    • H302Da: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_UNSPEC
    • H302Db: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_CH_UNAC
    • H302Dc: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_TM_EXP
    • H302Dd: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_ABN_RLS_NO_ACT
    • H302De: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_PREEMPT_RLS
    • H302Df: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_HO_IMPSBL_TA
    • H302Dg: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_NO_CH_MODEL
    • H302Dh: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_FREQ_NOT_IMP
    • H302Di: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_CALL_CLR
    • H302Dj: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_SMN_INCRCT_MSG
    • H302Dk: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_INVLID_MAN_INFO
    • H302Dl: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_MSG_TYPE_NONEXT
    • H302Dm: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_MSG_TYPE_NOT_CM
    • H302Dn: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_CDT_IE_ERR
    • H302Do: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_NO_CELL_ALLOC
    • H302Dp: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_PTCL_ERR_UNSPEC
    • H302Dq: CELL_INTRACELL_HO_FAIL_RECONN_SUCC_MS_RPT_OTHER
  • As shown in Figure 1, each time the handover from the underlay to the overlay of a concentric cell or from the overlay to the underlay of a concentric cell fails due to other reasons than no available channel (see measurement points B, C, and D), the counter H3022M or H3021M is incremented by one.
    • H3022M: CELL_INTRACELL_HO_FAIL_OTHERS_ULCELL_OLCELL
    • H3021M: CELL_INTRACELL_HO_FAIL_OTHERS_OLCELL_ULCELL
  • As shown in Figure 1, each time the internal intra-cell handover fails due to a specific reason (see measurement points A, B, C, and D), one of the following counters is incremented by one based on the specific failure reason.
    • H3020: CELL_INTRACELL_HO_FAIL_SD
    • H3029: CELL_INTRACELL_HO_FAIL_TCH
    • H3023A: CELL_INTRACELL_HO_FAIL_TCHF_TCHH
    • H3023B: CELL_INTRACELL_HO_FAIL_TCHH_TCHF
    • H3024A: CELL_INTRACELL_HO_FAIL_TCH_SD
    • H3024B: CELL_INTRACELL_HO_FAIL_SD_TCH
    • H302a: CELL_INTRACELL_HO_FAIL_BSC_LOOP
    • H302: CELL_INTRACELL_HO_FAIL_BTS_LOOP
    • H3025A: CELL_INTRACELL_HO_FAIL_AMR_TCHF_TCHH
    • H3025B: CELL_INTRACELL_HO_FAIL_AMR_TCHH_TCHF
    • H302G: CELL_INTRACELL_HO_FAIL_A_INTERF_FAIL

Formula

This is an original counter without involving any formula.

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