5G NR PDU session qfi如怎样射到drbID呢？

lizhiming183

从amf接收到InitialContextSetupRequest消息中的PDUSessionResourceSetupListCxtReq -> PDUSessionResourceSetupRequestTransfer -> QosFlowSetupRequestList -> QosFlowSetupRequestItem ->
QosFlowSetupRequestItem ::= SEQUENCE {
qosFlowIndicator    QosFlowIndicator,
qosFlowLevelQosParameters  QosFlowLevelQosParameters,
e-RAB-ID      E-RAB-ID           OPTIONAL,
iE-Extensions  ProtocolExtensionContainer { {QosFlowSetupRequestItem-ExtIEs} } OPTIONAL,
...
}

怎么把一个或者多个qfi映射到具体的drb呢？映射关系由配置文件确定吗？

E1接口消息 BearerContextSetupRequest -> NG-RAN-BearerContextSetupRequest -> PDU-Session-Resource-To-Setup-List
- > PDU-Session-Resource-To-Setup-Item -> DRB-To-Setup-List-NG-RAN -> DRB-To-Setup-Item-NG-RAN ->
DRB-To-Setup-Item-NG-RAN ::= SEQUENCE {
dRB-ID          DRB-ID,
sDAP-Configuration       SDAP-Configuration,
pDCP-Configuration       PDCP-Configuration,
cell-Group-Information      Cell-Group-Information,
flow-Mapping-Information     QoS-Flow-QoS-Parameter-List,
dRB-Data-Forwarding-Information-Request  Data-Forwarding-Information-Request  OPTIONAL,
dRB-Inactivity-Timer      Inactivity-Timer OPTIONAL,
pDCP-UL-Count        PDCP-Count        OPTIONAL,
pDCP-DL-Count        PDCP-Count        OPTIONAL,
iE-Extensions       ProtocolExtensionContainer { { DRB-To-Setup-Item-NG-RAN-ExtIEs } } OPTIONAL,
...
}

这两条消息里面标红的qosFlowIndicator和dRB-ID是如何映射的呢？

求大神解答一下