John English

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Asegurar una llamada de VoLTE esencialmente significa ser capaz de monitorizar dos sesiones relacionadas simultáneamente. 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.

Para conectarse a la red LTE, el suscriptor debe primero tener su dispositivo adjunto a la red de radio entonces, obtener autenticación, autorización y tener procedimientos de contabilidad realizados, dominios traducidos a ruta mensajes de señalización a switches (consulta DNS) y un sesión establecida antes de que el portador sea modificado. Una vez que el suscriptor está conectado a la red LTE, el suscriptor debe estar registrado en la red IMS y después comenzará la señalización de la sesión 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 este enfoque, las operaciones de redes y de ingeniería pueden monitorizar las sesiones de todos los suscriptores eficazmente con un enfoque de “arriba hacia abajo”. 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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