Executive Summary

Wi-Fi calling, also known as Voice over wireless LAN (VoWLAN) and VoWiFi, is a technology that enables mobile phone voice calls and data to be made over IP networks using Wi-Fi, instead of traditional cell towers. This technology utilizes the Generic Access Network (GAN) protocol, also known as Unlicensed Mobile Access (UMA), to forward cell phone packets to a network access point over the internet. The GAN system allows for seamless handoff between Wi-Fi and cellular networks, making it particularly useful in locations with poor cell coverage.

The latest generation of Wi-Fi calling technology is named VoWiFi by several handset manufacturers, including Apple and Samsung. This technology is dependent on IP Multimedia Subsystem/Session Initiation Protocol (IMS/SIP), IPsec, IWLAN, and ePDG. Wi-Fi calling offers several benefits, including the ability to make calls over the internet using the same native calling client, without the need for third-party Voice over IP (VoIP) services.

Architecture & Design

The GAN protocol is the foundation of Wi-Fi calling technology. It allows cell phone packets to be forwarded to a network access point over the internet, rather than over-the-air using traditional cellular networks. The GAN system consists of a GAN Controller (GANC), which receives data from the internet and feeds it into the phone network as if it were coming from an antenna on a tower.

The GAN protocol supports several modes of operation, including a 2G (A/Gb) connection from the GANC into the mobile core network (MSC/GSN). The latest generation of Wi-Fi calling technology, VoWiFi, is designed to work with IMS, IPsec, IWLAN, and ePDG. The system offers seamless handoff, allowing users to move from cell to Wi-Fi and back again with the same invisibility that the cell network offers when moving from tower to tower.

In terms of architecture, Wi-Fi calling technology relies on several key components, including the GANC, the network access point, and the handset. The GANC is responsible for receiving data from the internet and feeding it into the phone network. The network access point is responsible for providing the Wi-Fi connection, while the handset is responsible for routing regular cellular calls through the Wi-Fi network.

The process of making a Wi-Fi call involves several steps. First, the handset establishes a connection with the network access point using Wi-Fi. The handset then sends a request to the GANC to establish a call. The GANC receives the request and forwards it to the phone network, where it is connected to the destination phone. The call is then routed through the internet, using the GAN protocol to forward packets between the handset and the phone network.

Performance & Thermal

The performance of Wi-Fi calling technology is dependent on several factors, including the quality of the internet connection and the capabilities of the handset. In general, Wi-Fi calling offers several benefits over traditional cellular networks, including higher data transfer rates and lower latency.

However, the performance of Wi-Fi calling can be affected by several factors, including the distance between the handset and the network access point, the number of users on the network, and the quality of the internet connection. To improve the performance of Wi-Fi calling, several techniques can be used, including Quality of Service (QoS) prioritization and traffic shaping.

In terms of thermal performance, Wi-Fi calling technology is designed to operate within the thermal limits of the handset. The thermal solution used in the handset is designed to dissipate heat generated by the processor and other components, ensuring that the device operates within a safe temperature range.

The exact thermal performance of Wi-Fi calling technology is dependent on several factors, including the design of the handset and the operating conditions. However, in general, Wi-Fi calling technology is designed to operate within the thermal limits of the handset, ensuring reliable and efficient operation.

Market Positioning

Wi-Fi calling technology is positioned as a complementary technology to traditional cellular networks. It offers several benefits, including higher data transfer rates, lower latency, and improved coverage in areas with poor cell reception.

The target market for Wi-Fi calling technology includes several segments, including consumers, businesses, and service providers. Consumers can use Wi-Fi calling to make calls and send data over the internet, while businesses can use it to provide employees with a reliable and efficient means of communication. Service providers can use Wi-Fi calling to offer customers a range of services, including voice, data, and multimedia.

The competitors in the Wi-Fi calling market include several companies, including Apple, Samsung, and other handset manufacturers. These companies offer a range of Wi-Fi calling solutions, including VoWiFi and other technologies.