前言：
NAS這種網絡架構在2020年，國内大部分城市都是這種。
目前發現很多地方已經采用了SA 方案。
參考文檔
https://blog.csdn.net/milkbusy/article/details/83011011
https://blog.csdn.net/baidu_41616132/article/details/88909986
https://zhuanlan.zhihu.com/p/245146143
https://www.cnblogs.com/10y-dreams/p/11674076.html
https://www.bilibili.com/read/cv3181179/
https://www.txrjy.com/thread-1113402-1-1.html
https://blog.csdn.net/travel_life/article/details/110194765
https://www.eda365.com/portal.php?mod=view&aid=156263
目錄
1： 網絡架構
2: 組網模式
3： 注冊流程
4： 關鍵字
一 網絡架構
MCG：Master Cell group，主小區組,4G
SCG：Secondary Cell group，輔小區組, 5G
PCell：Primary Cell，主小區
SCell：Secondary Cell，輔小區
PSCell：Primary Secondary Cell，主輔小區
CA: Carrier aggregation ， PCell 和SCell通過CA技術聯合在一起。
sPCell: special Cell,sPCell = PCell + PSCell。
MR-DC：Multi-Radio Dual Connectivity，是把LTE雙連接配接技術擴充到其他RAT，讓UE可以同時接入LTE和NR，其中一個作為MN（Master Node），一個作為SN（Secondary Node），MN提供到核心網的控制面連接配接，SN不提供與核心網的控制面連接配接，隻為UE提供額外的資源。MN和SN之間通過網絡接口連接配接起來，至少MN要與核心網連接配接，SN可以與核心網連接配接，也可以不跟核心網連接配接。
參考連結：https://www.jianshu.com/p/1b4526e889bd
二 組網模式
目前國内主要是3x
MN:Masternode，充當MCG的節點，現有的NSA下就是4G基站，
SN: Secondarynode是充當SCG的節點 ,現有的NSA下就是5G基站。
https://blog.csdn.net/superlmj/article/details/82792950
三 主要流程：
四 關鍵
其中rohc-ProfilesUL-Only-r15參數表示支援5g。
step1 camp on 4G 小區
03:52:20 [0xB0C2] LTE RRC Serving Cell Info Log Pkt
Version = 3
Physical cell ID = 95
DL FREQ = 1226
UL FREQ = 19226
//step2 收到ISIB 消息，代表進入 5G 小區覆寫範圍,UI上面可以同步顯示
03:52:20 [0xB0C0] BCCH_DL_SCH / SystemInformation
upperLayerIndication-r15 true
//step3 能力查詢，分為兩次，一次4G,一次5G
-------------》網絡查詢
03:52:20 [0xB0C0] DL_DCCH / UECapabilityEnquiry
ue-CapabilityRequest
{
eutra, 4G
utra, 3G
geran-cs,2G
},
<-------------UE 回報
03:52:20 [0xB0C0] UL_DCCH / UECapabilityInformation
value UL-DCCH-Message ::=
{
message c1 : ueCapabilityInformation :
{
rrc-TransactionIdentifier 2,
criticalExtensions c1 : ueCapabilityInformation-r8 :
{
ue-CapabilityRAT-ContainerList
{
{
rat-Type eutra, 4G
ueCapabilityRAT-Container
},
{
rat-Type geran-cs,2G
ueCapabilityRAT-Container '33035758A6601404E2918100121E100000'H
},
{
rat-Type utra,3G
ueCapabilityRAT-Container
}
}
step4 RRCConnectionReconfiguration 這裡主要映射measId 1, measObjectId 1,
, reportConfigId 1，比如測量5G的Cell,網絡才會配置設定5Gcell
2021/06/10 03:52:20 [0xB0C0] DL_DCCH / RRCConnectionReconfiguration
measConfig
{
measObjectToAddModList
{
{
measObjectId 1,
measObject measObjectEUTRA :
{
carrierFreq 1226,
allowedMeasBandwidth mbw25,
presenceAntennaPort1 TRUE,
neighCellConfig '00'B
}
},
{
measObjectId 2,
measObject measObjectEUTRA :
{
carrierFreq 6400,
allowedMeasBandwidth mbw50,
presenceAntennaPort1 TRUE,
neighCellConfig '00'B,
measCycleSCell-r10 sf320
}
},
{
measObjectId 3,
measObject measObjectEUTRA :
{
carrierFreq 3725,
allowedMeasBandwidth mbw50,
presenceAntennaPort1 TRUE,
neighCellConfig '00'B,
measCycleSCell-r10 sf320
}
},
{
measObjectId 4,
measObject measObjectEUTRA :
{
carrierFreq 199,
allowedMeasBandwidth mbw50,
presenceAntennaPort1 TRUE,
neighCellConfig '00'B,
measCycleSCell-r10 sf320
}
},
{
measObjectId 5,
measObject measObjectNR-r15 :
{
carrierFreq-r15 634656,
rs-ConfigSSB-r15
{
measTimingConfig-r15
{
periodicityAndOffset-r15 sf20-r15 : 0,
ssb-Duration-r15 sf2
},
subcarrierSpacingSSB-r15 kHz30
},
quantityConfigSet-r15 1,
bandNR-r15 setup : 78
}
}
},
reportConfigToAddModList
{
{
reportConfigId 1,
reportConfig reportConfigEUTRA :
{
triggerType event :
{
eventId eventA3 :
{
a3-Offset 8,
reportOnLeave FALSE
},
hysteresis 0,
timeToTrigger ms256
},
triggerQuantity rsrp,
reportQuantity both,
maxReportCells 8,
reportInterval ms640,
reportAmount infinity
}
},
{
reportConfigId 2,
reportConfig reportConfigEUTRA :
{
triggerType event :
{
eventId eventA5 :
{
a5-Threshold1 threshold-RSRP : 24,
a5-Threshold2 threshold-RSRP : 26
},
hysteresis 0,
timeToTrigger ms320
},
triggerQuantity rsrp,
reportQuantity both,
maxReportCells 8,
reportInterval ms640,
reportAmount infinity
}
},
{
reportConfigId 3,
reportConfig reportConfigEUTRA :
{
triggerType event :
{
eventId eventA2 :
{
a2-Threshold threshold-RSRP : 18
},
hysteresis 0,
timeToTrigger ms1024
},
triggerQuantity rsrp,
reportQuantity sameAsTriggerQuantity,
maxReportCells 8,
reportInterval min60,
reportAmount r1
}
},
{
reportConfigId 4,
reportConfig reportConfigEUTRA :
{
triggerType event :
{
eventId eventA2 :
{
a2-Threshold threshold-RSRP : 24
},
hysteresis 0,
timeToTrigger ms480
},
triggerQuantity rsrp,
}
},
{
reportConfigId 5,
reportConfig reportConfigEUTRA :
{
triggerType periodical :
{
purpose reportStrongestCells
},
triggerQuantity rsrp,
reportQuantity both,
maxReportCells 8,
}
},
{
reportConfigId 6,
reportConfig reportConfigEUTRA :
{
triggerType periodical :
{
purpose reportStrongestCells
},
triggerQuantity rsrp,
reportQuantity both,
maxReportCells 8,
reportInterval min60,
reportAmount r1
}
},
{
reportConfigId 7,
reportConfig reportConfigInterRAT :
{
triggerType event :
{
eventId eventB1-NR-r15 :
{
b1-ThresholdNR-r15 nr-RSRP-r15 : 38,
reportOnLeave-r15 FALSE
},
hysteresis 4,
timeToTrigger ms256
},
maxReportCells 8,
reportInterval min60,
reportAmount r1,
reportQuantityCellNR-r15
{
ss-rsrp TRUE,
ss-rsrq FALSE,
ss-sinr FALSE
}
}
}
},
measIdToAddModList
{
{
measId 1,
measObjectId 1,
reportConfigId 1
},
{
measId 2,
measObjectId 1,
reportConfigId 2
},
{
measId 4,
measObjectId 1,
reportConfigId 3
},
{
measId 7,
measObjectId 1,
reportConfigId 4
},
{
measId 9,
measObjectId 1,
reportConfigId 5
},
{
measId 14,
measObjectId 2,
reportConfigId 6
},
{
measId 17,
measObjectId 5,
reportConfigId 7
}
},
2021/06/10 03:52:20 [0xB0C0] UL_DCCH / RRCConnectionReconfigurationComplete
//step5 測量報告
根據RRC 映射關系 measId 9, measObjectId 1,reportConfigId 5 ，知道UE 要網絡配置的是LTE的信道
reportConfigId 5,
reportConfig reportConfigEUTRA :
{
triggerType periodical :
{
purpose reportStrongestCells
},
triggerQuantity rsrp,
reportQuantity both,
maxReportCells 8,
reportInterval ms5120,
reportAmount r16,
includeLocationInfo-r10 true
}
2021/06/10 03:52:20 [0xB0C0] UL_DCCH / MeasurementReport
value UL-DCCH-Message ::=
{
message c1 : measurementReport :
{
criticalExtensions c1 : measurementReport-r8 :
{
measResults
{
measId 9,
measResultPCell
{
rsrpResult 78,
rsrqResult 7
},
measResultNeighCells measResultListEUTRA :
{
{
physCellId 93,
measResult
{
rsrpResult 78,
rsrqResult 6
}
}
}
}
}
}
}
2021/06/10 03:53:13 [0xB0C0] UL_DCCH / MeasurementReport 上報的是5G cell
Interpreted PDU:
value UL-DCCH-Message ::=
{
message c1 : measurementReport :
{
criticalExtensions c1 : measurementReport-r8 :
{
measResults
{
measId 17,
measResultPCell
{
rsrpResult 79,
rsrqResult 15
},
measResultNeighCells measResultNeighCellListNR-r15 :
{
{
pci-r15 180,
measResultCell-r15
{
rsrpResult-r15 82
}
},
{
pci-r15 182,
measResultCell-r15
{
rsrpResult-r15 68
}
}
}
}
}
}
}
//step6 網絡RRCReconfig，提供5G SpCell
2021/06/10 03:53:13 DL_DCCH / RRCConnectionReconfigurationRadio Bearer ID: 1, Freq: 1226, SFN: 7191
nr-SecondaryCellGroupConfig-r15 '48091050A7700018C98E00'H
2021/06/10 03:53:13 NR5G RRC OTA Packet RRC_RECONFIG 1
2021/06/10 03:53:13 NR5G RRC Configuration InfoLength: 121 1
2021/06/10 03:53:13
2021/06/10 03:53:13 [0xB825] NR5G RRC Configuration Info
Version = 10
State = CONNECTED
Config Status = true
Connectivity Mode = NSA
Contiguous CC Info
------------------------------------------------------
| |Band | | |
|# |Number|DL BW Class |UL BW Class |
------------------------------------------------------
| 0| 78| NR5G_RRC_BWC_A| NR5G_RRC_BWC_A|
NR5G Serving Cell Info
--------------------------------------------------------------------------------------------------
| | | | | | | | | | |DL |UL |
| |CC |Cell | | | | | |DL Carrier|UL Carrier|Max |Max |
|# |Id |Id |DL Arfcn |UL Arfcn |SSB Arfcn |Band |Band Type|Bandwidth |Bandwidth |MIMO|MIMO|
--------------------------------------------------------------------------------------------------
| 0| 0| 180| 634666| 634666| 634656| 78| SUB6| BW_40MHz| BW_40MHz| 4| 1|
Radio Bearer Info
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | | | | | | | | | | | | |UL |UL PDCP |UL Data |
| |RB |Termination|DL RB | |DL ROHC| |DL Integrity |UL RB | |UL ROHC| |UL Integrity |Primary|Dup |Split |
|# |ID |Point |Type |DL RB Path|Enabled|DL Cipher Algo |Algo |Type |UL RB Path|Enabled|UL Cipher Algo |Algo |Path |Activated|Threshold |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0| 4| NR| DRB|LTE_AND_NR| false| NONE (nea0)| NONE (nea0)| DRB|LTE_AND_NR| false| NONE (nea0)| NONE (nea0)| NONE| false| 0|
2021/06/10 03:53:13 NR5G RRC OTA Packet RRC_RECONFIG_COMPLETE 1
2021/06/10 03:53:13 UL_DCCH / RRCConnectionReconfigurationCompleteRadio Bearer ID: 1, Freq: 1226, SFN: 01
//step7 Acq
//step8 5G Cell info
03:00:31.332303 [0xB825] NR5G RRC Configuration Info
Version = 10
State = IDLE
Config Status = true
Connectivity Mode = NSA
LTE Serving Cell Info
Num Bands = 1
Band List = 3