Omar

Expert Opinion

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

    A Brief Introduction to REST

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    REST , (Representational State Transfer), is an architectural style. In SOA , (Service Oriented Architecture), Web services are performed on a service. REST is an ROA , (Resource Oriented Architecture), and performs operations...
  • 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

    Network Based Terminating Access Domain (T-ADS) Selection

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    (Blog Updated as of May 1, 2014) The SCC-AS , (Service Centralization and Continuity Application Server), is the entity in the VoLTE capable IMS network that determines how to terminate the call to the UE by applying either...
  • 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

    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

    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

    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...