NB-IoT中DCI Format N0格式解析DCI Format N0的用途RAR random access responseDCI Format N0包含的信元:解析RAR脚本参考文档

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DCI Format N0的用途

DCI: Downlink Control Information 携带在NPDCCH中，用于上下行发送的调度。
DCI Format N0用于调度上行的NPUSCH。

RAR random access response

为什么需要先了解下RAR?

在解析在DCI Fromat N0时刻，有些信息在RAR中已经作为前置条件存在，如子载波间隔subcarrier spacing

RAR的组成(总长度15比特)，从MSB到LSB:

Uplink subcarrier spacing: 1bit 0-3.75kHz 1-15kHz
subcarrier indication field: 6bits 参考DCI Format N0中的 subcarrier indication
Scheduling delay field: 2bits 参考DCI Format N0中的 Scheduling delay，不同的是值为0时，delay为12
Msg3 repetition number: 3bits 参考DCI Format N0中的repetition number
MCS index indicating TBS, modulation, and number of RUs for Msg3: 3bits 参考下图,第一次Msg3的RV0，后续重传使用NPDCCH中的配置

DCI Format N0包含的信元:

Flag for format N0/format N1

1bit 0-format N0 1-format N1

subcarrier indication - 6bits

Msg3MCS.PNG 从之前的RAR中获取；
采用3.75k的情况下，信元指示的值即为所采用子载波，有效值为0-47，48-63为保留值；
采用15kHz的情况下参考下图

Resource assignment -3bits

能够到RU的个数，参考下图

Scheduling delay-2bits

指示最后一个子帧距离第一个上行发送的子帧间隔

Modulation and scheme-4bits

得到的值为 $I_{MCS}$ ,如 $N_{sc}>1$ $I_{TBS} = I_{MCS}$ ,否则通过下图映射得到
根据TBS index和RU Index得到blocksize

Redundancy version-1bits

RV值，影响编解码

Repetition number-3bits

重复次数配置

New data indicator-1bit

指示前后两次数据是重传，还是新传；

DCI subframe repetition number-2bits

NPDCCH R的repeat次数，用于计算最后一个发送子帧，再根据delay可以算出NPUSCH发送的第一个子帧时间；

HARQ process number-1bit

R14 支持两个HARQ的情况下，指示哪一个HARQ传输。

Uplink Resource Unit

在这里插入图片描述

解析RAR脚本

需要解析码流太麻烦，搞个小脚本~

复制代码

#!/usr/bin/python3
class MyBitDecoderClass():
'''MLB first'''
def __init__(self,elementList):
self.elmentList = elementList
pass
def __del__(Self):
pass
def bitdecoder(self,hexValStr,offset=0):
decoderVal = int(hexValStr,16)
decoderVal = decoderVal>>offset
#print(decoderVal)
decoderRslt = {}
for eachKey in self.elmentList.keys():
decoderRslt[eachKey] = decoderVal>>self.elmentList[eachKey][0]
maskVal = (0x1<<self.elmentList[eachKey][1])-1
decoderRslt[eachKey] = decoderRslt[eachKey] & maskVal
return decoderRslt
def decoderRAR(hexValStr,offset=0):
RaRElementList = {
#key first Bit Index，bitNumber 
'subcarrierSpacing':[14,1],
'subcarrerIndication':[8,6],
'schedulingDealy':[6,2],
'Msg3RepetionNumber':[3,3],
'MCSIndex':[0,3],
}
bitDecoder = MyBitDecoderClass(RaRElementList)
decoderRslt = bitDecoder.bitdecoder(hexValStr,offset)
if(decoderRslt['subcarrierSpacing'] == 0):
print('subcarrierSpacing 3.75k')
print('subcarrerIndication : %d'%decoderRslt['subcarrerIndication'])
else:
print('subcarrierSpacing 15k')
if(decoderRslt['subcarrerIndication']<12):
print('subcarrerIndication : %d'%decoderRslt['subcarrerIndication'])
elif(decoderRslt['subcarrerIndication']<16):
print('subcarrerIndication totalNumber 3 : start %d'%(3*(decoderRslt['subcarrerIndication']-12)))
elif(decoderRslt['subcarrerIndication']<18):
print('subcarrerIndication totalNumber 6 : start %d'%(3*(decoderRslt['subcarrerIndication']-16)))
elif(decoderRslt['subcarrerIndication']<19):
print('subcarrerIndication totalNumber 12')
else:
print('subcarrerIndication error configuration!')
#print('schedulingDealy : %d'%(8*(1<<decoderRslt['schedulingDealy'])))
if(decoderRslt['schedulingDealy'] == 0):
print('schedulingDealy : %d'%12)
else:
print('schedulingDealy : %d'%(8*(1<<decoderRslt['schedulingDealy'])))
print('Msg3RepetionNumber : %d'%(1<<decoderRslt['Msg3RepetionNumber']))
print('MCSIndex : %d'%(decoderRslt['MCSIndex']))
pass
if __name__ == '__main__':
#print('test bit decoder')
#print(decoderRslt)
decoderRAR('0x88040',5)
pass

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#!/usr/bin/python3
class MyBitDecoderClass():
'''MLB first'''
def __init__(self,elementList):
self.elmentList = elementList
pass
def __del__(Self):
pass
def bitdecoder(self,hexValStr,offset=0):
decoderVal = int(hexValStr,16)
decoderVal = decoderVal>>offset
#print(decoderVal)
decoderRslt = {}
for eachKey in self.elmentList.keys():
decoderRslt[eachKey] = decoderVal>>self.elmentList[eachKey][0]
maskVal = (0x1<<self.elmentList[eachKey][1])-1
decoderRslt[eachKey] = decoderRslt[eachKey] & maskVal
return decoderRslt
def decoderRAR(hexValStr,offset=0):
RaRElementList = {
#key first Bit Index，bitNumber 
'subcarrierSpacing':[14,1],
'subcarrerIndication':[8,6],
'schedulingDealy':[6,2],
'Msg3RepetionNumber':[3,3],
'MCSIndex':[0,3],
}
bitDecoder = MyBitDecoderClass(RaRElementList)
decoderRslt = bitDecoder.bitdecoder(hexValStr,offset)
if(decoderRslt['subcarrierSpacing'] == 0):
print('subcarrierSpacing 3.75k')
print('subcarrerIndication : %d'%decoderRslt['subcarrerIndication'])
else:
print('subcarrierSpacing 15k')
if(decoderRslt['subcarrerIndication']<12):
print('subcarrerIndication : %d'%decoderRslt['subcarrerIndication'])
elif(decoderRslt['subcarrerIndication']<16):
print('subcarrerIndication totalNumber 3 : start %d'%(3*(decoderRslt['subcarrerIndication']-12)))
elif(decoderRslt['subcarrerIndication']<18):
print('subcarrerIndication totalNumber 6 : start %d'%(3*(decoderRslt['subcarrerIndication']-16)))
elif(decoderRslt['subcarrerIndication']<19):
print('subcarrerIndication totalNumber 12')
else:
print('subcarrerIndication error configuration!')
#print('schedulingDealy : %d'%(8*(1<<decoderRslt['schedulingDealy'])))
if(decoderRslt['schedulingDealy'] == 0):
print('schedulingDealy : %d'%12)
else:
print('schedulingDealy : %d'%(8*(1<<decoderRslt['schedulingDealy'])))
print('Msg3RepetionNumber : %d'%(1<<decoderRslt['Msg3RepetionNumber']))
print('MCSIndex : %d'%(decoderRslt['MCSIndex']))
pass
if __name__ == '__main__':
#print('test bit decoder')
#print(decoderRslt)
decoderRAR('0x88040',5)
pass

参考文档

3GPP 36.212 - R14
3GPP 36.213 - R14
3GPP 36.211 - R14

最后

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本文分类：通信系统
浏览次数：131 次浏览
发布日期：2023-04-05 02:40:01
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NB-IoT中DCI Format N0格式解析DCI Format N0的用途RAR random access responseDCI Format N0包含的信元:解析RAR脚本参考文档

DCI Format N0的用途

RAR random access response

DCI Format N0包含的信元:

Flag for format N0/format N1

subcarrier indication - 6bits

Resource assignment -3bits

Scheduling delay-2bits

Modulation and scheme-4bits

Redundancy version-1bits

Repetition number-3bits

New data indicator-1bit

DCI subframe repetition number-2bits

HARQ process number-1bit

Uplink Resource Unit

解析RAR脚本

参考文档

最后

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NB-IoT中DCI Format N0格式解析DCI Format N0的用途RAR random access responseDCI Format N0包含的信元:解析RAR脚本参考文档

DCI Format N0的用途

RAR random access response

DCI Format N0包含的信元:

Flag for format N0/format N1

subcarrier indication - 6bits

Resource assignment -3bits

Scheduling delay-2bits

Modulation and scheme-4bits

Redundancy version-1bits

Repetition number-3bits

New data indicator-1bit

DCI subframe repetition number-2bits

HARQ process number-1bit

Uplink Resource Unit

解析RAR脚本

参考文档

最后

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