There is a great deal of interest behind vcc from both the operator and vendor communities as the ability to provide session continuity across. Page 9 information technology disaster recovery plan july 1, 2014cm plan overview the disaster recovery plan is composed of a number of sections that document resources and procedures to be used in. Voice call continuity between ims and circuit switched systems. Our contact center continuity solution ensures the availability of your missioncritical call center operations without doubling your costs. In the second call flow, we will discuss an endtoend sip volte voice call. The voice calls on lte network are meant to be packet switched calls which use ims system to be made. Standard ims service continuity procedures are applied for execution of the session transfer. Test measurement challenges and field environment test planning school of electrical engineering master.
May 10, 2017 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. Single radio refers to the capacity of the terminal ue to transmitreceive at any given time on only one of the access networks available. A technology pioneer in distributed softswitching, damaka offers its whitelabel solution to operators, enterprises and other verticals such as telemedicine, distant learning. Continuity srvcc that seamlessly maintains voice calls. Voice call continuity based on ip multimedia subsystem, unlicensed mobile access, media independent handover and the third generation partnership project evolved. Without srvcc, a volte call on a device moving out of lte coverage will be dropped, since no operators currently support voip on 3g. Wo2007072462a2 voice call continuity for emergency calls.
The msc server initiates the session transfer by using the stnsr e. To make it inter operable with existing networks, these calls are to be handed over to circuit switched calls in. The major goal of voice call continuity vcc is to provide call consistency to the end users as calls are continuously moving between different networks and vendor technologies. Voice and data voice continuity communications systems. Srvcc from eutranutran hspa access to 3gpp utrangeran cs accesses for voice calls that are anchored in the ims, as well as the coordination between the srvcc for voice call and the handover of non voice ps. Voice call continuity how is voice call continuity abbreviated. Single radio voice call continuity srvcc and csfb vs. Deleted ct3 aspects of stage 3 for voice call continuity between cs and ims incl. Disaster recovery for your businesss call center 8x8, inc. Srvcc stands for single radio voice call continuity. Us patent for voice call continuity in hybrid networks patent. When an lte user has an active voice session in ims and is moving to areas which have legacy 2g3g coverage and does not have lte coverage.
Pdf voice call continuity a critical step towards allip. Single radio voice call continuity srvcc with lteby shwetha vittal, lead engineerlong term evolution lte is heralded as the next big thing for mobile networks. Voice call continuity vcc describes how a voice call persists even when being switched from one circuit to another. Bearer reservation with preemption for voice call continuity. Voice call continuity allows users to move voice calls between the circuitswitched cs domain and the multimedia domain mmd, connected through different. Pdf voice call continuity a critical step towards all. In this chapter, we will discuss two important volte call flows. In the first call flow, we will discuss registration of an imsvolte ue. Us patent for voice call continuity in hybrid networks. A successful business continuity bc or disaster recovery dr plan can be heavily attributed to proper planning, stakeholder awareness, and system capabilities. The srvcc is an lte functionality that allows a voipims call in the lte packet domain to be moved to a legacy voice domain gsmumts or cdma 1x.
Voice call continuity how is voice call continuity. Single radio voice call continuity srvcc can simplify rollout of a new lte network consider an operator who has decided to move voice services to voip over ims in conjunction with the deployment of an lte access network. An introduction to voice call continuity vcc clinton m. Single radio voice call continuity srvcc show commands andor outputs. The sccas entity combines the sip signaling and acts as a back. Full voice service coverage therefore relies on the following facts. Jun 10, 2018 srvcc stands for single radio voice call continuity. Bearer reservation with preemption for voice call continuity article pdf available in ieee transactions on wireless communications 85. These capabilities were designed per requirements in ts 22. We have been providing connectivity to our valued customers since 1989.
To configure call continuity settings, the companys account adminstrator can log into your admin portal and follow these basic steps. Solution to reduce voice interruption time during handover of volte call in enhanced single radio voice call continuity. In order to realize fullservice coverage as well as service continuity, however, one cannot rely on the fact that lte coverage is present everywhere the user may want to make a voice call. Srvcc, single radio voice call continuity provides a standardised means by which these transfers can be made in a seamless manner with the minimum of dropped calls. Srvcc ensures continuity of service when the mobile moves from one network in ps mode. Radio voice call continuity esrvcc supports control of voice handover into visited network in such a way that the visited network of the user equipment holds the voice data. Jan 18, 2017 unlike the csfb process, that passes from lte to 2g3g before, or during, the setup of a voice call, the srvcc involves the transfer of a call when it is already active in lte. Voice call continuity requires maintaining a voice call when a mobile. Voice call continuity is provided for calls that are carried over a hybrid network infrastructure in which access connections are distributed over loosely coupled network portions including a backend network such as a core voip voice over internet protocol service network, one or more cellular mobile networks, and a public switched telephone network pstn. Nonconfidential access to and distribution of this document is restricted to the persons permitted by the security classification.
Service centralization and continuity volte and vilte. With flexible and comprehensive features, you can be sure that in the event of a natural disaster, regional pandemic or humanerrorrelated outage, for your customers its business as usual. Vonage business cloud answer call continuity service. Service continuity an overview sciencedirect topics. Srvcc single radio voice call continuity sul evolution sae. Single radio voice call continuity voiceoveripvoip subscribersanchoredintheipmultimediasubsystem ims networkcanmoveout ofanltecoverageareaandcontinuethevoicecalloverthecircuitswitched cs networkthroughtheuse ofthesingleradiovoicecallcontinuity srvccfeature.
When deploying a cloud based call center, it is imperative to incorporate the different situations that are encountered into a business continuity or disaster recovery plan. Go to call continuity service and enter a backup number. Introduction the following template is provided as a tool and is intended to cover as many disaster scenarios as possible. The solution conforms to the recent technical requirements issued by the 3gpp and 3gpp2 standards bodies for ims to circuitswitched seamless voice handover, known as voice call continuity vcc.
Based in new jersey, voixis is a leading provider of voice, data, internet, and unified communications systems and services. Voice call continuity technology vcc is a fixedmobile convergence technology seamless handover between circuit switched and packet switched access networks requires new network components requires client software in the terminal. Voice call continuity between ims and circuit switched. Voice call continuity between circuit switched cs and ip multimedia subsystem ims study tr 23. Single radio voice call continuity srvcc and csfb vs srvcc. The 3gpp has defined the voice call continuity vcc specifications in order to describe how. Security architecturesupplementary uplink sumimo singleuser mimo tco total cost of ownership tdd time division duplexing ts technical specification ue user equipment ul uplink up user plane urllc ultra reliable low latency communications vi virtual infrastructure. Handling of nonvoice component and srvcc from 3gpp2 1xcs to eutran direction is not specified in this release. To make it inter operable with existing networks, these calls are to be handed over to circuit switched calls in gsmwcdma networks. Single radio voice call continuity srvcc provides an interim solution for handing over volte voice over lte to 2g3g networks.
Us20070149166a1 voice call continuity for emergency. Proceedings of the 6th ieee conference on consumer communications and networking conference comparing unlicensed mobile access uma and voice call continuity vcc architectures. Voice over ip voip subscribers anchored in the ip multimedia subsystem ims network can move out of an lte coverage area and continue the voice call over the circuitswitched cs network through the use of the single radio voice call continuity srvcc feature. Voice call continuity allows users to move voice calls between the circuit switched cs domain and the multimedia domain mmd, connected through different. Srvccsingle radio voice call continuityis the solution to this requirement for voice call continuity, and uses a single radio in the users device along with. Single radio voice call continuity from lte srvcc service for lte comes into the picture when a single radio user equipment ue accessing imsanchored voice call services switches from the lte network to the circuit switched domainwhile it is able to transmit or receive on only one of these access networks at a given time. Voice call continuity allows users to move voice calls between the circuitswitched cs domain and the multimedia domain mmd, connected through different internet protocol connectivity access networks ipcans e.
Single radio voice call continuity srvcc with lte radisys white paper 9. The present document specifies the functional architecture and information flows of the voice call continuity feature which provides the capability to transfer the path of an existing voice call between a 3gpp cs system gsmumts and ims, and vice versa. Handover between lte and 3g radio access technologies. Srvccsingle radio voice call continuityis the solution. The phone numbers page now displays the backup number in the call continuity column. Single radio voice call continuity electronics notes. Sep 02, 2009 damaka voice call continuity vcc technology enables call hand off between a cellular access network and a sip based voip access network. Comparing unlicensed mobile access uma and voice call. Srvcc ensures continuity of service when the mobile moves from one network in ps mode to a network in cs mode. Handover from lte to the legacy network is required when the user moves out of the lte coverage area. 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. Stage 1 for voice call continuity between cs and ims incl. Basically, srvcc is a call transfer method or handover which is implemented in a simplified and reliable manner used. Voice call continuity between ims and circuit switched systems x.
In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific. By partnering with voixis you choose an organization that has the experience to manage all of your communications needs. Unlikeothermethodslikecsfb,itdoesnot requireadualmoderadio. As voice calls in lte are packet data based within the ims environment, call continuity with legacy circuit switched services is not straightforward and can be handled in various ways. Voice and video call continuity over lte, wifi and 2g3g. To benefit earlier from seamless voice services and to increase the network coverage for calls, this manuscript presents a realizable and costeffective virtual room based vertical handoff vooh solution as a cloud voice service for seamless voice call continuity in a heterogeneous network.
Us20070149166a1 voice call continuity for emergency calls. It brings in promisingtechnologies such as semipersistent scheduling, transmission time interval tti bundling, and highperformance gains on quality of end user experience qoe. An enhanced voice call continuity vcc application server and a method are described herein that. Business continuity plan components and sequencing description this document is designed to help explain the contents of an example business continuity plans, so that team members will have a better understanding of how to relate a business continuity plan contents to the efforts needed to create them. Single radio voice call continuity srvcc 3glteinfo. Pdf solution to reduce voice interruption time during handover. This document defines an intertechnology domain transfer dt call model which supports procedures that.
If you would like assistance with your business continuity planning its is here to help. Sep, 20 voice call continuity is provided for calls that are carried over a hybrid network infrastructure in which access connections are distributed over loosely coupled network portions including a backend network such as a core voip voice over internet protocol service network, one or more cellular mobile networks, and a public switched telephone network pstn. It is expected that as you go through the template, you will edit, modify or delete the sections as appropriate to fit your business need. Sep 05, 2016 a brief overview explanation of how srvcc works.
Aug 18, 2011 voice call continuity vcc describes how a voice call persists even when being switched from one circuit to another. Dec 02, 20 rollout of lte over a legacy 2g3g network for imsbased voip service using single radio voice call continuity srvcc. Rollout of lte over a legacy 2g3g network for imsbased voip service using single radio voice call continuity srvcc. The ability to seamlessly move an active voice session between the ip multimedia subsystem news alert ims domain and the circuitswitched cs cellular network is currently being defined by 3gpp as the voice call continuity vcc effort. Click phone system icon atop the page, then phone numbers in the lefthand navigation bar. For example, the nokia n series and e series devices support. Performance evaluation of handover from umts to lte using. Srvcc from eutranutran hspa access to 3gpp utrangeran cs accesses for voice calls that are anchored in the ims, as well as the coordination between the srvcc for voice call and the handover of nonvoice ps. Pdf solution to reduce voice interruption time during. Chapter 27 voice call continuity this chapter is devoted to the voice call continuity vcc feature in the ims. Handling of non voice component and srvcc from 3gpp2 1xcs to eutran direction is not specified in this release. Ims service centralization and continuity guidelines.
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