John English

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Assicurare una chiamata VoLTE significa essenzialmente essere in grado di monitorare due sessioni correlate contemporaneamente. Before a voice over LTE session can occur, the subscriber device must connect to both the LTE and IMS networks and then establish a VoLTE session which effectively runs over-the-top (OTT) of the LTE network.

Per connettersi alla rete LTE, l'utente deve prima avere il proprio dispositivo collegato alla rete radio, quindi deve autenticarsi, ottenere l’autorizzazione e avere eseguito l'accesso, i domini devono essere tradotti per instradare i messaggi di segnalazione agli switch (query DNS) e deve essere stabilita una sessione prima della modifica del portatore. Quando l’utente è connesso alla rete LTE, quest’ultimo deve essere registrato alla rete IMS e avrà quindi inizio la segnalazione della sessione SIP. The SIP signaling to establish a VoIP session with RTP for the media will run over the LTE user plane interfaces and then onto the IMS network via the Mp or Gm interface.

Accordingly, a service assurance solution must provide both an end-to-end and hop-by-hop view to effectively monitor and perform service triage on VoLTE sessions. With that level of visibility it’s possible to take a proactive network monitoring approach where you deconstruct the LTE/VoLTE/IMS sessions into their essential procedures: radio attachment, authentication, session establishment in LTE, registration in IMS and so on. Con questo approccio, le operazioni e la progettazione delle reti possono monitorare in modo efficace le sessioni per tutti gli utenti con un approccio “top down”. If there is degradation in any step of the session model proactive measures can be taken to mediate that issue before service degradation or outage occurs.

The “top down” approach allows network operations and engineering to take a very complex service and break it down into the essential pieces or procedures to simplify service assurance and triage. In contrast, the “bottoms up” approach works off  individual subscriber sessions where the session messages are traced for each hop to identify the network or service issue. Other sessions then must be found to see if that single subscriber session is indicative of a wider ranging issue or a single instance. The “top down” approach addresses VoLTE service impacting issues for the entire subscriber base holistically and reduces the MTTR.

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