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SABM

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  • #65558 Reply
    NADEL
    Guest

    What make up the SABM message sent from the MS to the BTS?

    #65559 Reply
    vikas
    Guest

    I WANT KNOW ABOUT SABM IN TELECOM

    #65560 Reply
    Mithu_BL
    Guest

    After getting immediate assignment through AGCH the MS switches to the assigned channel and activates it. By sending an SABM frame containing a „Service
    Request Message“, it switches the SDCCH to the „Multiple Frame Acknowledge“mode, there by activating it. The Service Request message helps the network to recognize the service being requested by the MS. This information is used to decide
    how to proceed.
    Service request messages are:
    · CM SERVICE REQUEST
    · LOCATION UPDATING REQUEST
    · IMSI DETACH
    · PAGING RESPONSE
    · CM REESTABLISHMENT REQUEST

    Than the BTS send the acknowledgement that it has receive the service by means of UA frames.

    #65561 Reply
    vikas
    Guest

    Mr Mithu_BL,
    Thanks a lot for sharing this concept of SABM. In future how to contact you mithu??

    #65562 Reply
    vikas
    Guest

    What is the difference between cause value and cause No with respect to 3gpp papers. for reference in TS 24.008 v 5.16

    #65563 Reply
    Mithu_BL
    Guest

    Dear Vikas,
    Its my pleasure. U can mail me at:shapnik2007@gmail.com/smithu@banglalinkgsm.com

    #65564 Reply
    Karan Chopra
    Guest

    SABM message structure contains SABM message field which contains the type of service requested .
    Discuss the message structure in detail

    #65565 Reply
    Sarvesh Verma
    Guest

    RR SABM + MM CM SERVICE REQUEST
    TCH, SAPI = 0
    This is the first message that is sent after tuning to the
    channel. The Mobile initiates a LAPm connection with the
    BSC by sending a Set Asynchronous Balanced Mode
    (SABM) message. The service request message meant
    for the MSC is also sent in this message.
    RR UA
    TCH, SAPI = 0
    The BSS replies with Unnumbered Acknowledge (UA) to
    complete the LAPm setup handshake
    BSS Expert

    #65566 Reply
    Wallis Dudhnath
    Guest

    SABM has it starting point with X25 and ISDN.
    GSM is built on ISDN therefore you will see LAP-D (LAP-B points
    to X25).SABM(E) stands for Set asynchronous balanced mode extended.
    It is used to establish a Link Layer. For example with ISDN
    several INFO messages are exchanged before a SABME is sent by the
    TE. ISDN Network will send a with UA.

    #65567 Reply
    AWANISH MISHRA
    Guest

    HII, ANYONE CAN HELP ME TO GET KNOWN ABOUT THE WHOLE SIGNALLING ESTABLISHMENT BETWEEN THE MS AND NSS ACTUALLY WHICH SIGNAL IS REQUIRED WHAT TYPE OF CHANNEL IS REQUIRED FOR MOBILE ORIGINATING AND TERMINATING WHATEVER THE WHOLE PROCESS..

    VERY THANK YOU..

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