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The 3GPP has defined the Voice Call Continuity (VCC) specifications in order to describe how a voice call can be persisted, as a mobile phone moves between circuit switched and packet switched radio domains (3GPP TS 23.206). Many mobile phones are becoming available that support both cellular and other broadband radio technologies.
The 3rd Generation Partnership Project (3GPP) is an umbrella term for a number of standards organizations which develop protocols for mobile telecommunications. Its best known work is the development and maintenance of: [ 1 ]
An example of an application server that is being developed in 3GPP is the Voice call continuity Function (VCC Server). Depending on the actual service, the AS can operate in SIP proxy mode, SIP UA mode or SIP B2BUA mode. An AS can be located in the home network or in an external third-party network.
Enhanced Voice Services (EVS) is a superwideband speech audio coding standard that was developed for VoLTE and VoNR. It offers up to 20 kHz audio bandwidth and has high robustness to delay jitter and packet losses due to its channel aware coding [1] and improved packet loss concealment. [2] It has been developed in 3GPP and is described in 3GPP ...
System Architecture Evolution (SAE) is the core network architecture of mobile communications protocol group 3GPP's LTE wireless communication standard.. SAE is the evolution of the GPRS Core Network, but with a simplified architecture; an all-IP Network (AIPN); support for higher throughput and lower latency radio access networks (RANs); and support for, and mobility between, multiple ...
Able to produce a reasonable call with lower signal (cell phone reception) levels. Uses soft handoff, reducing the likelihood of dropped calls. IS-95's variable rate voice coders reduce the rate being transmitted when speaker is not talking, which allows the channel to be packed more efficiently. Has a well-defined path to higher data rates.
Call flow for the mobile terminated Short Message Service. The figure to the right depicts a call flow for mobile-terminated Short Message delivery. [1] For the sake of simplicity, some of the interactions between the VMSC and VLR, and VMSC and Handset, have been omitted, and only the case when SMS home routing is not in use is shown.
Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [ 1 ] [ 2 ] VoLTE has up to three times more voice [ 3 ] and data capacity than older 3G UMTS and up to six times more than 2G GSM .