Wifi calling architecture pdf

Ue can use mobike to inform epdg about change of ues ip address assigned by wifi network, not by pgw for existing ikeipsec tunnels without ike reestablishment. From an architecture perspective, the 3gpp s2a interface is used to integrate the epc with the carrier wifi access network using a trusted wlan access. Below we will discuss the wifi calling architecture in more detail and aptilos role in it. The difference between a portable and mobile station is that a portable station moves from point to point but is only used at a fixed point. Spirent ims rchitecture the lte user equipment perspective 8. The fixed end system fes acts as a server, a host, or a gateway depending on the environment. This wifi calling and the support of ims services over carrier wifi networks white paper investigates the business and technical issues pertaining to a platform, solution, or technology and examine its technical implications within the overall network architecture. Central to wifi boosters is wifi bandwidth extension. Wifi calling devices do not advance the wifi security for wifi calling. Wifi and tcpip libraries get a chance to handle any pending events each time the loopfunction completes, or when delayis called. In this article i will try to put some examples of volte call flow from ue point of view. The differences between a wifi booster, wifi extender and.

Often associated with volte voice over long term evolution, wifi calling is the means by. Is this needed even for handover within the wifi network too, i. Wifi calling is a combination of specs from gsma and 3gpp and is nothing more than voip using sip and spp, tunneled through intervening networks via standard protocols ikev2 with aes encryption. Vulnerabilities, attacks, and countermeasures tian xie, michigan state university guanhua tu, michigan state university bangjie yin, michigan state university chiyu li, national chiao tung university chunyi peng, purdue university mi zhang, michigan state university hui liu, michigan state university.

Cdpd architecture is similar to the model of the world wide web. Once on the carrier core network, the packet streams for wifi calling or lte network voice calling are served by a packet gateway pgw. The untrusted 3gpp wifi access model is used for wifi calling. As far as i know it is the only one of the key series with dual sim that will a register ims on both sims and allow volte calls on which ever sim you want. Ims ip multimedia subsystem is a standalone system. The first architecture to be presented is the socalled centralized wlan architecture. In some cases, however, the user might not be human. The dark side of operational wifi calling services tian xie. For example, a business traveler accessing the internet from a public wireless lan at an airport is a user. Ip mobility with session continuity in 3gpp wifi access. Wifi calling, or voice over wifi vowifi, presents an opportunity to. The untold secrets of operational wifi calling services arxiv. The major advantage of wifi is that it is compatible with almost every operating system, game device, and advanced printer.

The evolved packet core epc the allip epc used in lte is a part of the transport block of the architecture, where transport is the entity through which the overall network e. With trio at the center of the table, workers enjoy the. We briefly describe the wifi calling architecture as well as security. We briefly describe the wifi calling architecture as well as security mechanisms for understanding the vulnerabilities and attacks we propose in this work. Download this app from microsoft store for windows 10 mobile, windows phone 8. Voice over wifi 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 wifi. Make audio calls, video calls, share content or all three. Wifi calling and the support of ims services over carrier. Cellular networks khoury college of computer sciences. Wifi wireless technology working principles, types and. Wifi calling 5g training courses, 4g lte wifi 3g and.

Wifi calling link copied often associated with volte voice over long term evolution, wifi calling is the means by which service providers can support seamless mobility between the lte and wifi networks, whilst maintaining voice services. The layers above the physical and data link layers include tcpip. How to deploy trusted untrusted 3gpp wifi access aptilo. It resides out of the lte network and connected to pdn gateway through sgi interface. Voice over wifi vowifi allows users to make calls over. Wifi calling course description often associated with volte voice over long term evolution, wifi calling is the means by which service providers can support seamless mobility between the lte and wifi networks, whilst maintaining voice services. However, the wlan manager needs to ensure that wifi calling phones cant compromise the network. Each computer, mobile, portable or fixed, is referred to as a station in 802. The term wifi booster was a catchall phrase for devices that extended a wifi signal. The s8 home routing approach means that the voice, video calling, and messaging services are provided by the ims in the home network while the visited network provides the connectivity, qos, and regulatory services. This chapter discusses how to design a wireless network.

Smartphone sales can drop if even one aspect is sub par. Because equivalent concepts of apns and pdn connectivity are supported over wifi access using the epdg and. It is a completely different technology that uses a variety of licensed and unlicensed frequencies. Volte and vowifi wifi calling, deployment scenarios, network architecture and finally network elements and functions. Wlan architectures there are two major approaches today for deploying wlan networks in the enterprise. In adhoc mode, all radios can communicate with each other as long as they are in range. When two or more stas are wirelessly connected, they form a basic service set bss. Apple iphone once the service provider settings have been updated follow these steps to request 4g voice. A modular and flexible architecture ensures components can be. Volte roaming is deployed with the s8 home routing architecture which expands on and reuses the lte data roaming architecture. Wifi is a physicallink layer interface, as is ethernet. In the aruba architecture, security is based on roles.

The idea of ims is old, but after its deployment with lte users and operators can harness the true power of ims. Network architecture for lte and wifi interworking. The only thing missing is wifi calling which was on the key2 single sim until the oreo update and then it was removed. Or ac le s olu ti on br ie f wifi calling for mobile. The course builds on the lte system engineering and wifi. Rate limits can also be applied on a perwlan basis for every client. From the users perspective, wifi is internet access from a wirelesscapable device like a phone, tablet, or laptop.

Cellular concept several small cells instead of a single transmitter frequency reuse. The combination of passpoint authentication and wifi calling enables robust inbuilding and campus cellular coverage, delivered over wifi. Department of computer science and engineering, michigan state univeristy college of computer science, national chiao tung university department of computer science, purdue university email. The continuing importance of voice in the carrier model. This means that smartphone voice vowifi calls will work over any wifi connection, even the subscribers own network at home. Wifi calling has emerged as a way to extend coverage and improve capacity, especially indoors, by moving traffic intelligently between lte and high quality wifi connections. Similarly if we use this architectural technique in wireless lan or wifi is called as wireless lan architecture. Wireless technology overview 3 because wlans use rf, the throughput speed is inversely proportional to the distance between the transmitter and the receiver. How wireless works users a user can be anything that directly utilizes the wireless network. How wifi works like mobile phones, a wifi network makes use of radio waves to transmit information across a network. This is typically counter to alternatives, predominantly voice over lte volte, in which a mobile network operators mnos licensed spectrum i. The difference mainly lies in its service architecture, which. This can transform the 4g voice business case and, since wifi calling is imsbased too, it can offer the same range of capabilities as volte. When volte is applied the wifi calling feature will also be applied.

On the technical side, internet protocol ip being agnostic to the physical medium provides a way to run voip as. All wireless devices that join a wifi network, whether mobile, portable or fixed, are called wireless sta tions stas. Volte call flow and procedures is very big area to cover because of the many scenarios to consider from both ue and network perspective. Our wifi calling user experience always choose wifi over cellular to make or receive call calls start in cellular stay in cellular enterprise needs to unblock ipsec iphone relies on minimal qos support from the network 17. On a practical level, this means that all rabbit sample programs and customer applications for tcpip that are run on an ethernet interface. The mobile end system mes acts as a client who uses the cdpd network over the wireless environment. Overview of wireless architecture purdue university. Poly trio smart conference phones let you join a meeting in seconds with a single touch of a button. Most modern devices support wifi so that the devices can access a network to gain internet access and share network resources. Wifi calling dramatically changes the economics of providing indoor coverage for mobile network operators mnos by leveraging wifi and the internet to complement the macro radio access network ran. Calling and texting features very few other features pdas personal digital assistants. They will not relay traffic for other nodes without an additional routing protocol in infrastructure mode, clients must be within range of an access point.

Access points, consisting of antennas and routers, are the main source that transmit and receive radio waves. With this proven technology, it is not necessary to deploy costly and complex small cells, citizens band radio service cbrs, private lte or 5g or, in most cases, distributed antenna solutions. This can be done by identifying the characteristics of wifi calling traffic and writing firewall rules to ensure that only traffic meeting that profile is allowed. The two approaches have some basic philosophical differences which can have a major impact on deployment costs, security and manageability. Wifi calling solution with wifi calling aaa so called. A wireless station might be a pc, a laptop, a pda, a phone, or a rabbit core module. This serves as an anchor for either connection type where the continuous stream of packets are passed off to the ip multimedia server ims function, a highly scalable voip switch. For wifi calling, this functionality allows the device to request access to the imsapn, so the pgw can provide connectivity to the imsdefined sip servers, xcap servers, and media gateways. The first step to get wifi calling is to request that voltewifi 4g voice calls be applied to the account. If your phone has a working copy of the embedded code for this feature, and you have a valid account with a carrier supporting it, you can connect.

It covers several different types of wireless media. It is a technique of designing and arrangement of different components in wireless local area networking device in a specific way. If you have a loop somewhere in your sketch that takes a lot of time 50ms without calling delay, you might consider adding a call to delayfunction to keep the wifi stack running smoothly. Represents the core network in the 3gpp lte system architecture. Wifi has been developed for mobile computing devices, such has laptops, but it is now.