LTE: Transport of NAS messages

·            The purpose of the transport of NAS messages procedure is to carry SMS messages in an encapsulated form between the MME and the UE

·            The procedure may be initiated by the UE or the network and can only be used when the UE is attached for EPS services and IMSI attached for non-EPS services and is in EMM-CONNECTED mode

·            In the UE initiated case, upon request from the SMS entity to send an SMS message, the EMM entity in the UE initiates the procedure by sending an UPLINK NAS TRANSPORT message including the SMS message in the NAS message container IE

·            The network initiates this procedure by sending a DOWNLINK NAS TRANSPORT message which contains the actual SMS message in the NAS message container IE

·            The IE NAS message container is used to encapsulate the SMS messages transferred between the UE and the network. This IE can contain SMS messages such as CP-DATA, CP-ACK, or CP-ERROR

Reference 3GPP TS 24.301
Example1: Uplink NAS Transport – CP-ACK


Example2: Downlink NAS Transport – CP-DATA


Posted by KP
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18 comments:

  1. KuldeepJuly 15, 2015 at 9:20 PM

    Hi Kumar,
    I have a very basic question regarding Transport of NAS messages. Suppose the UE is in RRC idle state and the network wants to send an SMS over NAS. In this case does the UE need to go to RRC connected state to receive that SMS or UE can receive and decode the SMS in RRC idle state itself. I think it will be considered as a control information received on PDSCH, and the UE can decode it in RRC Idle state.
    I am little confused over this. Please help me in understanding this concept.
    Thank you

    ReplyDelete
    Replies
    1. KPJuly 27, 2015 at 9:25 AM

      The UE has to have RRC Connection and NAS Context established in order to receive SMS.

      Delete
  2. AnonymousMay 2, 2016 at 10:37 AM

    Hi may I know where can I get a sample wireshark or pcap file of this? So that I can view the whole message structure. Thank you.

    ReplyDelete
    Replies
    1. AnonymousSeptember 17, 2016 at 11:53 AM

      This comment has been removed by a blog administrator.

      Delete
  3. UnknownMay 9, 2016 at 12:43 PM

    Can anyone tell me what will be the content of SMS message?
    when is this SMS messages used?

    ReplyDelete
    Replies
    1. AnonymousSeptember 29, 2016 at 8:24 AM

      This comment has been removed by a blog administrator.

      Delete
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    Hi Can Anyone tell me the message 00fs in LTE

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  11. UnknownJanuary 6, 2022 at 6:13 AM

    Can any suggest.Is Downlink NAS Transport message is only for SMS over SGs interface ??

    ReplyDelete
  12. AnonymousJune 17, 2022 at 5:10 PM

    Will the NAS transport later exist if the sms is over ims?

    ReplyDelete
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