Voice over WLAN

network. In most cases, the Wi-Fi network and voice components supporting the voice system are privately owned.

VoWLAN can be conducted over any Internet accessible device, including a laptop, PDA or the new VoWLAN units which look and function like cellphones. VoWLAN's chief advantages to consumers are cheaper local and international calls, free calls to other VoWLAN units and a simplified integrated billing of both phone and Internet service providers.

Although VoWLAN and 3G have certain feature similarities, VoWLAN is different in the sense that it uses a wireless internet network (typically 802.11) rather than a Cellular network. Both VoWLAN and 3G are used in different ways.

Applications

A company with fixed warehouses or locations would take advantage of their existing WiFi network and use VoIP (hence VoWLAN) for employees to communicate with one another. This system can also be used like Land Mobile Radio System or Walkie-talkie systems with push to talk and emergency broadcast channels.

Another example would be a company that has mobile workers very much like the FedEx delivery person or the CocaCola delivery driver who delivers goods to a store. These workers need to take advantage of 3G type services whereby a cellular company (like Cingular, Verizon, T-Mobile, Sprint/Nextel) provide data access between the handheld device and the companies back-end network.

Benefits

A voice over WLAN system offers tremendous benefits to organizations, such as hospitals and warehouses. The primary benefits are mobility and cost savings. For example, nurses and doctors within a hospital can maintain voice communications at any time at less cost as compared to cellular service. In most cases, it’s possible to receive a return on investment within three years. [cite web|url=http://www.wireless-nets.com/resources/downloads/VoWLAN_C1.html|title=VoWLAN Applications and Benefits|accessdate=2008-10-09]

Types

#as an extension to celluar network using Generic access network.
#as a local network independent of cellular company.

Design Considerations

A Wi-Fi network that supports voice telephony must be carefully designed in a way that maximizes performance and is able to support the applicable call density. A voice network includes call gateways in addition to the Wi-Fi access points. The gateways provide call handling among wireless IP phones and connections to traditional telephone systems. The Wi-Fi network supporting voice applications must provide much stronger signal coverage than what’s needed for most data-only applications. In addition, the Wi-Fi network must provide seamless roaming between access points. [cite web|url=http://www.wireless-nets.com/resources/downloads/VoWLAN_C2.html|title=VoWLAN System Components|accessdate=2008-10-09]

ee also

*GAN
*Mobile VOIP
*VoWi-Fi

References