TAILIEUCHUNG - Chapter 25 - Push-to-talk over Cellular

Push-to-talk over Cellular (PoC) was the first IMS-based service deployed by several mobile operators because it does not require the deployment of new radio technologies. PoC can run on top of low-bandwidth and high-delay links, which are inappropriate for running other types of services, such as voice calls. PoC is a walkie-talkie type of service. Users press (and hold) a button when they want to say something, but they do not start speaking until their terminal tells them to do so (usually by beeping). . | Chapter 25 Push-to-talk over Cellular Push-to-talk over Cellular PoC was the first IMS-based service deployed by several mobile operators because it does not require the deployment of new radio technologies. PoC can run on top of low-bandwidth and high-delay links which are inappropriate for running other types of services such as voice calls. PoC is a walkie-talkie type of service. Users press and hold a button when they want to say something but they do not start speaking until their terminal tells them to do so usually by beeping . At this point users say whatever they want to say and signal the end of their speech by releasing the button. Unlike regular voice calls which are full-duplex PoC is a half-duplex service that is only one user can speak at a time. PoC sessions can have more than two participants. At a given time one user speaks and the rest listen as in the two-party case . A simple way of understanding a multiparty PoC is a group of friends going to the movies. One at a time they take turns to tell the rest which movie they want to watch at which point they can make the final choice usually after some extra rounds of discussions . Even though Push-to-talk was originally designed to be a voice-only service it currently supports different media types such as streamed video and instant messages. PoC Standardization When the definition of the PoC service started there were several incompatible PoC specifications. Many were not based on the IMS but consisted of proprietary solutions implemented by a single vendor. As a result these PoC solutions generally could not interoperate with equipment from other vendors. Many operators willing to provide PoC services felt uncomfortable with the situation just described and asked a few vendors for a standard solution based on the IMS. As a consequence a group of vendors teamed up to develop an open PoC industry standard. These vendors were Ericsson Motorola Nokia and Siemens. The result of this collaboration .

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