小区切换：LTE, 3GPP, 36.331, 5.5.4, A1 A2 A3 A4 A5 事件，测量上报的触发
测量上报的触发条件有两种：（1）事件触发和（2）周期触发
一个处于RRC_CONNECTED状态的UE可以通过测量一个或者多个beam来得到小区测量的结果。
在使用和评估测量结果之前，UE可以使用层3的滤波器。层3滤波公式如下：
F n = ( 1 − a ) F n − 1 + a M n F_n=(1-a)F_{n-1}+aM_n Fn=(1−a)Fn−1+aMn
- M n M_n Mn 是上一次物理层测量结果。
- F n F_n Fn 是更新的滤波后的结果，它被用来评估测量标准。
- F n − 1 F_{n-1} Fn−1 是旧的滤波结果，当第一个测量结果被接收时， F 0 F_0 F0赋值给 M − 1 M-1 M−1。
- a = 1 / 2 ( k / 4 ) a=1/2^{(k/4)} a=1/2(k/4), k 是滤波参数。 如果k为0，则层3的滤波无效。
**Table 1: ** reportConfig
| reportStrongestCellsForSON | 考虑邻小区 |
|---|---|
| reportCGI | 在测量对象中上报相应的CGI |
| reportLocation | 只考虑PCell |
| others | Table 1.1 |
**Table 1.1: ** measObject
| E-UTRA | ue-RxTxTimeDiffPeriodical | 只考虑PCell |
|---|---|---|
| reportSSTD-Meas = true | 只考虑SPCell | |
| eventA1 or eventA2 | 只考虑服务小区 serving cell | |
| eventC1 or eventC2 or reportStrongestCSI-RSs | 考虑CSI-RS资源 | |
| measRSSI-ReportConfig | consider the resource indicated by the rmtc-Config | |
| tx-ResourcePoolToAddList | transmission resource pools | |
| others | useWhiteCellList is, …, alternativeTimeToTrigger | |
| UTRA or CDMA2000 | ||
| GERAN | ||
| WLAN | ||
| NR | reportSFTD-Meas=pSCell | 只考虑SPCell |
| neighborCells | cellsForWhichToReportSFTD or <=3 cells |
**Table 2: ** triggerType
- timeToTrigger defined for this event, entry condition applicable
- timeToTrigger defined for this event, entry condition applicable, but not included in the cells TriggeredList
- timeToTrigger defined for this event, leaving condition applicable
- timeToTrigger defined for this event, entry condition applicable, CSI-RS resources for all measurements
- timeToTrigger defined for this event, entry condition applicable, CSI-RS resources not included in the csi-RS-TriggeredList
- timeToTrigger defined for this event, leaving condition applicable, CSI-RS resources included in the csi-RS-TriggeredList
- timeToTrigger defined for this event, entry condition applicable, transmission resource pools for all measurements
- timeToTrigger defined for this event, entry condition applicable, transmission resource pools not included in the poolsTriggeredList for all measurements
- timeToTrigger defined for this event, leaving condition applicable, transmission resource pools included in the poolsTriggeredList
others: reportStrongestCells, reportStrongestCellsForSON, reportLocation or sidelink
####Event A1 (Serving becomes better than threshold)
Inequality A1-1 (Entering condition)
M s − H y s > t h r e s h Ms-Hys>thresh Ms−Hys>thresh
Inequality A1-2 (Leaving condition)
$ Ms-Hys < thresh$
- Ms is the measurement result of the serving cell, not taking into account any offsets.
- Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).
- Thresh is the threshold parameter for this event (i.e. a1-Threshold as defined within reportConfigEUTRA for this event).
- Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.
- Hys is expressed in dB.
- Thresh is expressed in the same unit as Ms.
####Event A2 (Serving becomes worse than threshold)
Inequality A2-1 (Entering condition)
M s + H y s < t h r e s h Ms+Hys<thresh Ms+Hys<thresh
Inequality A2-2 (Leaving condition)
$ Ms-Hys > thresh$
####Event A3 (Neighbour becomes offset better than PCell/ PSCell)
Inequality A3-1 (Entering condition)
M n + O f n + O c n − H y s > M p + O f p + O c p + O f f Mn+Ofn+Ocn-Hys>Mp+Ofp+Ocp+Off Mn+Ofn+Ocn−Hys>Mp+Ofp+Ocp+Off
Inequality A3-2 (Leaving condition)
M n + O f n + O c n + H y s > M p + O f p + O c p + O f f Mn+Ofn+Ocn+Hys>Mp+Ofp+Ocp+Off Mn+Ofn+Ocn+Hys>Mp+Ofp+Ocp+Off
- Mn is the measurement result of the neighbouring cell, not taking into account any offsets.
- Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).
- Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.
- Mp is the measurement result of the PCell/ PSCell, not taking into account any offsets.
- Ofp is the frequency specific offset of the frequency of the PCell/ PSCell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the PCell/ PSCell).
- Ocp is the cell specific offset of the PCell/ PSCell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the PCell/ PSCell), and is set to zero if not configured for the PCell/ PSCell.
- Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).
- Off is the offset parameter for this event (i.e. a3-Offset as defined within reportConfigEUTRA for this event).
- Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.
- Ofn, Ocn, Ofp, Ocp, Hys, Off are expressed in dB.
####Event A4 (Neighbour becomes better than threshold)
Inequality A4-1 (Entering condition)
M n + O f n + O c n − H y s > T h r e s h Mn+Ofn+Ocn-Hys>Thresh Mn+Ofn+Ocn−Hys>Thresh
Inequality A4-2 (Leaving condition)
M n + O f n + O c n + H y s > T h r e s h Mn+Ofn+Ocn+Hys>Thresh Mn+Ofn+Ocn+Hys>Thresh
####Event A5 (PCell/ PSCell becomes worse than threshold1 and neighbour becomes better than threshold2)
Inequality A5-1 (Entering condition 1)
M p + H y s < T h r e s h 1 Mp+Hys<Thresh1 Mp+Hys<Thresh1
Inequality A5-2 (Entering condition 2)
M n + O f n + O c n − H y s > T h r e s h 2 Mn+Ofn+Ocn-Hys>Thresh2 Mn+Ofn+Ocn−Hys>Thresh2
Inequality A5-3 (Leaving condition 1)
M p − H y s > T h r e s h 1 Mp-Hys>Thresh1 Mp−Hys>Thresh1
Inequality A5-4 (Leaving condition 2)
M n + O f n + O c n + H y s < T h r e s h 2 Mn+Ofn+Ocn+Hys<Thresh2 Mn+Ofn+Ocn+Hys<Thresh2
- Mp is the measurement result of the PCell/ PSCell, not taking into account any offsets.
- Mn is the measurement result of the neighbouring cell, not taking into account any offsets.
- Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).
- Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.
- Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).
- Thresh1 is the threshold parameter for this event (i.e. a5-Threshold1 as defined within reportConfigEUTRA for this event).
- Thresh2 is the threshold parameter for this event (i.e. a5-Threshold2 as defined within reportConfigEUTRA for this event).
- Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.
- Ofn, Ocn, Hys are expressed in dB.
- Thresh1 is expressed in the same unit as Mp.
- Thresh2 is expressed in the same unit as Mn.
####Event A6 (Neighbour becomes offset better than SCell)
Inequality A6-1 (Entering condition)
M n + O c n − H y s > M s + O c p + O f f Mn+Ocn-Hys>Ms+Ocp+Off Mn+Ocn−Hys>Ms+Ocp+Off
Inequality A6-2 (Leaving condition)
M n + O c n + H y s > M s + O c p + O f f Mn+Ocn+Hys>Ms+Ocp+Off Mn+Ocn+Hys>Ms+Ocp+Off
####Event B1 (Inter RAT neighbour becomes better than threshold)
####Event B2 (PCell becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)
####Event C1 (CSI-RS resource becomes better than threshold)
####Event C2 (CSI-RS resource becomes offset better than reference CSI-RS resource)
####Event W1 (WLAN becomes better than a threshold)
####Event W2 (All WLAN inside WLAN mobility set becomes worse than threshold1 and a WLAN outside WLAN mobility set becomes better than threshold2)
####Event W3 (All WLAN inside WLAN mobility set becomes worse than a threshold)
####Event V1 (The channel busy ratio is above a threshold)
####Event V2 (The channel busy ratio is below a threshold)