在5G的NSA组网(双连接）结构中RRC作用之一就是添加NR小区作为以4G为锚点的SCG；
1.RRC消息主要内容
NR小区配置
NR相关SCG配置
NR无线承载配置
2.消息主要字段
RRC消息中的信息非常多，其中包括NR小区中的MIB,SIB和RRC配置消息；RRC连接配置中主要内容见下表：
字段 Function (Information) | Description |
NR小区下行频率和带宽 | spCellConfigCommon.frequencyInfoDL spCellConfigCommon.initialDownlinkBWP |
NR小区上行频率和带宽 | spCellConfigCommon.uplinkConfigCommon.frequencyInfoUL spCellConfigCommon.uplinkConfigCommon.initialUplinkBWP |
NR小区PRACH | spCellConfigCommon.uplinkConfigCommon.initialUplinkBWP.rach-ConfigCommon |
解码RAR(PDSCH)的PDCCH配置 | spCellConfigCommon.initialDownlinkBWP.pdcch-ConfigCommon |
解码RAR(PDSCH)的PDSCH配置 | spCellConfigCommon.initialDownlinkBWP.pdsch-ConfigCommon |
公共信道上PUSCH信道配置 | spCellConfigCommon.uplinkConfigCommon.initialUplinkBWP.PUSCH-ConfigCommon |
专用信道（msg4和其他）的PDCCH配置 | spCellConfigDedicated.initialDownlinkBWP.pdcch-Config |
专用信道（msg4和其他）的PDSCH配置 | spCellConfigDedicated.initialDownlinkBWP.pdsch-Config |
专用信道（msg4 应答和其他）的PUCCH配置 | spCellConfigDedicated.initialDownlinkBWP.pdcch-Config |
专用信道（msg4 应答和其他）的PUSCH配置 | spCellConfigDedicated.initialDownlinkBWP.pdcch-Config |
TDD模式UL/DL配置 | spCellConfigCommn.tdd-UL-DL-ConfigurationCommon spCellConfigDedicated.tdd-UL-DL-ConfigurationDedicated |
3.RRC消息示例
RRCConnectionReconfiguration-v1430-IEs ::= SEQUENCE {
sl-V2X-ConfigDedicated-r14 SL-V2X-ConfigDedicated-r14 OPTIONAL, -- Need ON
sCellToAddModListExt-v1430 SCellToAddModListExt-v1430 OPTIONAL, -- Need ON
perCC-GapIndicationRequest-r14 ENUMERATED{true} OPTIONAL, -- Need ON
systemInformationBlockType2Dedicated-r14
OCTET STRING (CONTAINING SystemInformationBlockType2) OPTIONAL,
nonCriticalExtension RRCConnectionReconfiguration-v15x0-IEs OPTIONAL}
RRCConnectionReconfiguration-v1510-IEs ::= SEQUENCE {
nr-Config-r15 CHOICE {
release NULL,
setup SEQUENCE {
endc-ReleaseAndAdd-r15 BOOLEAN,
nr-SecondaryCellGroupConfig-r15 OCTET STRING OPTIONAL, -- Need ON
p-MaxEUTRA-r15 P-Max OPTIONAL -- Need ON }
} OPTIONAL, -- Need ON
sk-Counter-r15 INTEGER (0.. 65535) OPTIONAL, -- Need ON
nr-RadioBearerConfig1-r15 OCTET STRING OPTIONAL, -- Need ON
nr-RadioBearerConfig2-r15 OCTET STRING OPTIONAL, -- Need ON
tdm-PatternConfig-r15 CHOICE {
release NULL,
setup SEQUENCE {
subframeAssignment-r15 SubframeAssignment-r15,
harq-Offset-r15 INTEGER (0.. 9)
} } OPTIONAL, -- Need ON
nonCriticalExtension SEQUENCE {} OPTIONAL}
RRCConnectionReconfiguration-v15x0-IEs ::= SEQUENCE {
endc-Config-r15 SEQUENCE {
scg-ConfigReleaseNR-r15 BOOLEAN,
sk-Counter-r15 INTEGER (0.. 65535) OPTIONAL, -- Need ON
nr-SecondaryCellGroupConfig-r15 OCTET STRING OPTIONAL, -- Need ON
nr-RadioBearerConfig-r15 OCTET STRING OPTIONAL, -- Need ON
nr-RadioBearerConfigS-r15 OCTET STRING OPTIONAL, -- Need ON
tdm-PatternSingle-Tx-r15 SEQUENCE {
subframeAssignment-r15 SubframeAssignment-r15,
harq-Offset-r15 INTEGER (0.. 9) OPTIONAL -- Need ON
} OPTIONAL -- Need ON}
OPTIONAL -- Need ON
nonCriticalExtension SEQUENCE {} OPTIONAL}
nr-SecondaryCellGroupConfig1-r15,nr-SecondaryCellGroupConfig2-r15 : Includes NR RRCReconfiguration message.
The field includes the configuration of RBs configured with NR PDCP.
nr-RadioBearerConfig : Include NR RadioBearerConfig. Mainly for DRB, EPS, NR PDCP Configuration
RRCConnectionResume-v15x0-IEs ::= SEQUENCE {
sk-Counter-r15 INTEGER (0.. 65535) OPTIONAL, -- Need ON
nr-RadioBearerConfig-r15 OCTET STRING OPTIONAL, -- Need ON
nr-RadioBearerConfigS-r15 OCTET STRING OPTIONAL, -- Need ON
nonCriticalExtension SEQUENCE {} OPTIONAL}
原文来自：[url]www.sharetechnote.com[/url]
整理：kangguoying20201128
"自动驾驶为什么更可靠--5G网络时延缩短的秘密！"已在微信公众号"跟着老康学5G"中推出，敬请关注！
关注楼主