VoWiFi means that radio waves is used in wireless networks to exchange voice instead wired network. It enables VoLTE subscribers to access EPC network using WiFi register with IMS network. So that, they can use IMS services as voice calls, SMS, and other supplementary services and Subscribers can use WiFi to access EPC network when LTE is unavailable. VoWiFi is needed for Coverage Enhancement, If there is an area which has poor coverage but WiFi is available, Competence Enhance, Operators are willing to provide new services, Customer Retention, Operators provide free or unlimited services to attract more user, Saving Roaming Cost , Operators has WiFi roaming agreement in a suitable market, Less cost for operators, No need to build BTSs, In VoWiFi the caller and callee do not need to have the same application to talk to each other in contrast to OTT. The callee does not need to have internet connection to accept the call, and VoWiFi is seamless, handover is very simple and smooth VoWiFi has only three available choices, Untrusted access network and Trusted access network, IMS direct access, VoWiFi subscribers access a WiFi network, use the ePDG to attach to an EPC network, and then register with an IMS network, ePDG and AAA server is the new network elements for VoWiFi solution, all traffic is secured by AAA server and IP sec protocol, it depends mainly on VoLTE solution.
Papers:
Priyanka Luthra, M.Tech CSE, D.A.V.I.E.T, Jalandhar, Manju Sharma Associate Professor IT D.A.V.I.E.T, Jalandhar, “Performance Evaluation of Audio Codecs using VoIP Traffic in Wireless LAN using RSVP,” International Journal of Computer Applications (0975
– 8887) vol.40– No.7, February 2012.
Hi,
Voice over Wi-Fi (VoWiFi) is a term typically employed to describe the delivery of commercial telephony services using Voice over IP (VoIP) technologies from mobile devices connected across Wi-Fi.
The performance metrics are:
- Accuracy
- Speed
- Efficient
I disagree, for Voice services, the only valid criterion is M. O. S. as used in any ITU-T voice quality assessment. Typically you need a user lab, and sessions with 8-10 human subjects, rating between 1 and 5 what they hear (which is a representative sample of spoken sentences, under different channel conditions). If you get 4 that's good, and closer to 5 even better
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