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Thread: Lte csfb

  1. #1
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    Lte csfb

    LTE CSFB
    The CS FallBack (CSFB) in EPS enables the provisioning of voice and other CS-domain services (e.g. CS UDI video, LCS, USSD) by reuse of CS infrastructure when the UE is served by E-UTRAN. A CSFB enabled terminal, connected to E-UTRAN may use GERAN or UTRAN to connect to the CS-domain. This function is only available in case E-UTRAN coverage is overlapping with either GERAN coverage or UTRAN coverage.
    The MO SMS and MT SMS are signalled over SGs and do not cause any CS Fallback to GERAN/UTRAN RATs, and consequently does not require any overlapped GERAN/UTRAN coverage.

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    Hi,
    could you confirm that SMS do not require CSFB? As far as I know LTE does not support it when only data services are enabled.

    If voice services are enabled, aka VoLTE enabled, then SMS may be also possible but there is no longer need of CSFB.


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    Hello. You can also check this material on CSFB: http://blog.yate.ro/2015/06/25/voice...-tribulations/


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    Also here is some information about options for SMS in LTE (we can support IMS MESSAGE, LTE NAS tunneling or CSFB): http://yatebts.com/technology/network_functions. Let me know if you need more info.


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    Hi adragnea,

    thanks for the link, it's interesting to see that SMS over IP is implemented somewhere. Do you know if this is already used in live networks?

    Furthermore, I see that you posted many threads about yateBTS and I assume you are somehow related to it. Could you maybe post some new thread presenting it? It looks indeed interesting and would like to know some insights about it.

    An extract from Yate's unified core network characteristics:

    SIP - Supported standards (RFC3261)
    - Registrar function
    - B2BUA for calls
    - RTP (RFC3550) with sideband DTMF (RFC2833)
    - SMS and USSD over IP
    SMS - Format: SMS PDU (MO and MT)
    - MAP/SS7 transport (T-PDU format)
    - SIP MESSAGE transport (SMS over IP, R-PDU format)



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