Omar

Expert Opinion

Expert Opinion
Short LTE articles and opinions by our team of Subject Matter Experts (SMEs)
  • Omar

    What if the UE’s requested APN is different from the HSS’s defined default APN?

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    The MME decides on which APN to select as a default APN based on information provided by the UE during the initial attach, and the subscriber profile received from the HSS in the Update Location Answer. The APN identifies the...
  • Omar

    APN-FQDN Naming Structure

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    APN Usage In LTE, UEs get connected to one or more Packet Data Network (PDN), such as the Internet. The PDN Gateway (P-GW) interconnects LTE to the external PDN. Therefore, as part of the PDN Connectivity process, the UE may...
  • Omar

    APN S-NAPTR DNS Query

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    The MME may obtain the P-GW list for PDN connectivity of a specific APN (Access Point Name). However, if the MME uses APN-FQDN (Fully Qualified Domain Name) to obtain the P-GW list, then an S-NAPTR (Straightforward Name Authority...
  • Omar

    SRVCC Operation Possible Information Element

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    Purpose of SRVC operation possible indication: It is an indication flag, if set to true at the eNB, then the UE and the network are SRVCC capable. Otherwise, either the UE or the network is not SRVCC capable . SRVCC...
  • Omar

    How Does a UE Indicate it is SRVCC Capable on Attach Request?

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    The attach procedure identifies some of the important UE capabilities via the NAS signaling between the MME and the UE. In which, the UE may indicate it is SRVCC UE capable. According to clause 5.11.3 of TS 23.401, the UE...
  • Omar

    Use of Session Transfer Number STN-SR in SRVCC

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    Purpose of STN-SR : According to TS 23.003, STN-SR follows the E.164 telecommunications number format, and is used by the MSC server for session transfer of the media path from the PS domain to the CS Domain. VoLTE is a key...
  • Omar

    Use of C-MSISDN in SRVCC

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    The C-MSISDN, Correlation Mobile Station ISDN number, is one of the variables that is used to identify an anchored voice session in IMS. Below is a list of events that take place to clarify the use of the C-MSISDN during a PS...