已知参数值如下:
①HoAveragingLevDL=4, weighting=2; ③hoThresholdLevDL=-95dBm, px=2, nx=3;
②pcAveragingLevDL=4, weighting=2; ④pcLowerThresholdsLevDL=-88dBm, px=2, nx=3 pcUpperThresholdsLevDL= -70dBm
⑤ variableDLStepUse (VDLS) = Yes, PcUpperThresholdsQualDL=1,
powerDecrStepSize (RED)=2
⑥ optimumRxLevDL (LEVD)= -76dBm
⑦ powerDecrQualFactor (PDF)=1, pwrDecrLimitBand0 (PD0)=12,
pwrDecrLimitBand1 (PD1)=8, pwrDecrLimitBand2 (PD2)=4

假设当前测量报告结果如下

Time	t=1	t=2	t=3	t=4	t=5	t=6	t=7	t=8	t=9
Measurement Report	1	2	3	4	5	6	7	8	9
DTX used	0	0	1	1	0	0	0	1	1
Rxlev_DL(dBm)	-87	-90	-93	-96	-96	-95	-93	-98	-99

请说明以下题目的答案是怎么来的？
4.1         功率控制将在何时触发?  D
A. t=2                          B. t=3                          C. t=4                          D. t=5
 
4.2         切换何时触发 ?   D
A. t=5                          B. t=6                          C. t=7                          D. t=8
 
4.3         如果所有快速平均算法都打开，t=1的测量值为切换后的测量值，那么第一个平均值为?   A
A. -87 dBm                  B. -88.5 dBm                C. -90.5 dBm                D. -89.4 dBm
 
4.4         如果所有快速平均算法都打开，功率控制将在何时触发?   B
A. t=2                          B. t=3                          C. t=4                          D. t=5
 
4.5         如果所有快速平均算法都打开，切换何时触发?   C
A. t=5                          B. t=6                          C. t=8                          D. t=9 
 
 
4.6         如果 AV_RxQual_DL_PC= 0,  AV_RxLev_DL_PC= -65 dBm , 则质量原因降功率幅度为?   B
A. 12dB                       B. 10dB                       C. 8dB                         D. 4dB 
 
4.7         如果 AV_RxQual_DL_PC= 1,  AV_RxLev_DL_PC= -65 dBm, 则质量原因降功率幅度为?   C
A. 12dB                       B. 10dB                       C. 8dB                         D. 4dB 
 
4.8         如果 AV_RxQual_DL_PC= 2,  AV_RxLev_DL_PC= -65 dBm, 则质量原因降功率幅度为?  D
A. 12dB                       B. 10dB                       C. 8dB                  D. 以上都不对 
 
4.9         如果 OptimumRxLevDL=N,  AV_RxQual_DL_PC= 1,  AV_RxLev_DL_PC= -65dBm, 则质量原因降功率幅度为?   B
A. 10dB                       B. 5dB                         C. 4dB                         D. 2dB
 
4.10      如果 OptimumRxLevDL=N,  AV_RxQual_DL_PC= 1,  AV_RxLev_DL_PC= -68dBm, 则质量原因降功率幅度为?  D
A. 10dB                       B. 5dB                         C. 4dB                         D. 2dB
 
4.11      如果 OptimumRxLevDL=N,  VariableDLStepUse =N,  AV_RxQual_DL_PC=1,  AV_RxLev_DL_PC= -65dBm, 则质量原因降功率幅度为?   D
A. 10dB                       B. 5dB                         C. 4dB                         D. 2dB
 
4.12      如果AV_RxQual_DL_PC= 0, 降功率将在 AV_RxLev_DL_PC小于等于哪一项时停止?   C
A. -70dBm                   B. -75dBm                   C. -82dBm                    D. -85dBm