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Thread: RRC connection request : Establishment cause mt-access

  1. #1
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    Default RRC connection request : Establishment cause mt-access

    What is actually happening in an RRC CONNECTION REQUEST with establishment cause: mt-access.

    I have observed this was happening in response to paging message mainly. Both paging message and rrc reqst have the same mmec and s-tmsi meaning it is a paging response to the paging done for this Ue.

    What is the information contained in the paging response in rrc reqst message with

    cause: mt-access.??

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  3. #2
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    Default Re: RRC connection request : Establishment cause mt-access

    Quote Originally Posted by eta004 View Post
    What is actually happening in an RRC CONNECTION REQUEST with establishment cause: mt-access.

    I have observed this was happening in response to paging message mainly. Both paging message and rrc reqst have the same mmec and s-tmsi meaning it is a paging response to the paging done for this Ue.

    What is the information contained in the paging response in rrc reqst message with

    cause: mt-access.??
    I think "mt" maybe stand for Mobile Terminal. UE request connection to get a call?

    I'm not sure...

    Brgds,

  4. #3
    Senior Member Reputation: 529
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    Default Re: RRC connection request : Establishment cause mt-access

    Quote Originally Posted by eta004 View Post
    What is actually happening in an RRC CONNECTION REQUEST with establishment cause: mt-access.

    I have observed this was happening in response to paging message mainly. Both paging message and rrc reqst have the same mmec and s-tmsi meaning it is a paging response to the paging done for this Ue.

    What is the information contained in the paging response in rrc reqst message with

    cause: mt-access.??

    This is generally a paging request coming for specific UE, due to some ping/data coming for UE..

    Generally if you see only MT att increase then it can be an attack from some website/server on specific Subnets/IPs of your eNBs and UEs.We have such attacks multiple times each year..Analyze Wireshark logs and try to find out the IPs doing alot of pings but no reply in response.
    --------------------------------------------------------------------------------------------------------
    Thanks!

    Pass: optimizer

  5. #4
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    Default Re: RRC connection request : Establishment cause mt-access

    RRC connection request with establishment cause mt-access contained: Ue-Identity (S-TMSI or randomValue) and the establishment cause (mt-Access)



    RRCConnectionRequest-r8-IEs ::= SEQUENCE {
    ue-Identity InitialUE-Identity,
    establishmentCause EstablishmentCause,
    spare BIT STRING (SIZE (1))
    }

    InitialUE-Identity ::= CHOICE {
    s-TMSI S-TMSI,
    randomValue BIT STRING (SIZE (40))
    }

    EstablishmentCause ::= ENUMERATED {
    emergency, highPriorityAccess, mt-Access, mo-Signalling,
    mo-Data, delayTolerantAccess-v1020, mo-VoiceCall-v1280, spare1}

  6. #5
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    1 out of 1 members found this post helpful.

    Default Re: RRC connection request : Establishment cause mt-access

    mt stands for mobile terminating or commonly known as the Bnumber. That's why it is associated with paging.

  7. #6
    Member Reputation: 37
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    2010-08-02
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    Default Re: RRC connection request : Establishment cause mt-access

    https://tech.queryhome.com/69801/con...ess-signalling

    you can search for signalling in LTE . bR.

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