LTE(4G) - NR(5G) NSA Transfer (RRC UL Information transfer)

目录

​​UL / DL信息发送​​

​​描述UL/DL information transfer​​

​​UL流程图​​

​​DL流程图​​

​​DL Information Transfer Log​​

​​UL Infomation Transfer Log​​

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UL / DL信息发送

描述UL/DL information transfer

在RRC层我们是需要传输NAS消息的，NAS消息是会被封装到（UL/DL Information Transfer）信令消息中的。

这两条消息（UL/DL）主要来透传NAS消息的

UL流程图

DL流程图

DL Information Transfer Log

DLInformationTransfer
Type: DCCH_DL
Direction: Downlink
Computer Timestamp : 16:44:24.135
Earfcn\Pci : 43214 - 34
DL - DCCH-Message
  message
    c1
      dlInfomationTransfer
        rrc-TransactionIdentifier: 0
        criticalExtensions
          c1
            dlInformationTransfer-r8
              dedicatedInfoType
                dedicateInfoNAS: 0x4214A91D3445A31D25C   //定义专门用来传输NAS的
ESM Information Reqeust  //详细NAS 包含的内容。如果是UE发送给基站，那么基站是不会读NAS消息的，会传输给MME进行读取。如果UE收到，那么UE会读取NAS消息
  Security header type: (2) Integrity protected and ciphered 
  protocol_discriminator: EPS Mobility Management
  Message authentication code: 0xdabb4112
  Sequence number : 4
  0000 .... = EPS bearer identity : 0
  .... 0010 = protocol_discriminator: (2) EPS session management message
  Procedure transaction identity: 1
  NAS EPS session management messages: (0xd9) ESM information request

UL Infomation Transfer Log

ULInformationTransfer
Type DCCH_UL
Direction Uplink
Computer Timestamp 135435.42
EarfcnPci 34419 - 45
UL-DCCH-Message
  message
    c1
      ulInformationTransfer
        criticalExtensions
          c1
            ulInformationTransfer-r8
              dedicatedInfoType
                dedicatedInfoNAS 0x4512423553af15fas4444122  //定义专门用来传输NAS的
ESM Information Response //详细NAS 包含的内容。如果是UE发送给基站，那么基站是不会读NAS消息的，会传输给MME进行读取。如果UE收到，那么UE会读取NAS消息
  Security header type (2) Integrity protected and Ciphered
  protocol_discriminator EPS Mobility Management
  Message authentication code 0x88412a4123
  Sequence number 4
  0000 ... = EPS bearer identity 0
  Procedure transaction identity 1
  NAS EPS session management messages (0xda) ESM information response
  Access Point Name
    Element ID 59
    Length 5 octets
    APN cmnet