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Third-Generation
Wireless (Wireless 3G)
The explosion of wireless devices and technologies has brought about many proposed protocols and standards, and one of the latest is the wireless 3G (third-generation wireless) standard set. Third generation wireless is an evolution from traditional circuit switching to pure packet-based communications enabling high-speed transfers of voice and data to wireless devices like mobile phones and handheld organizers. Wireless 3G is preceded by earlier wireless generations that are still in use today: 1G first-generation wireless (analog cellular), 2G second-generation wireless (digital cellular), and 2.5G second generation enhancements. First-generation of wireless technology used analog radio signals and circuit switch-based communication. The usefulness was limited, and the call quality was often poor. Second-generation wireless was a major improvement in cellular technology, moving from an analog to a digital signal. A digital signal can be filtered to improve call quality and reliability, and more calls can be handled since digital signals can be compressed and decompressed accurately. An additional benefit of using a digital signal is that it is very compatible with data transmissions as well as voice. Soon, the second-generation wireless phones were equipped with new features, such as text messaging, expanding the role of the wireless phone. These new capabilities generated a demand for even more features that were better and faster. An enhancement to the second-generation phones, called 2.5G, combined digital circuit switched voice and digital packet switched data. The 2.5G wireless phones incorporated transfer protocols that most of our mobile devices use for web browsing and other data exchanges today. The second-generation wireless phones have created the demand once again for more functionality, especially as we become more mobile in our lives and in business. Wireless 3G is the proposed answer to public demand, promising data transmission rates of thousands of kilobits per second, providing enough bandwidth for the wireless transfer of streaming video and faster web browsing. Wireless 3G will be a universal set of standards, allowing for interoperability of wireless devices, regardless of location - that means your cell phone will work anywhere in the world. Proponents of the standard foresee wireless 3G blurring the line between wired and wireless communication until the "wire" becomes irrelevant. Wireless 3G technologies are being designed for use on an IP backbone, extending voice and data convergence to the wireless world - creating an open, standards-based global IP network. Customers will get better service, and carriers will benefit from the simplification of their networks. The biggest obstacles to wireless 3G are the vendors who provide wireless technologies. There are several proposed protocols that will operate under the standard, but the companies involved are having a difficult time coming to an agreement on what to use. Because of this, it's difficult to predict exactly when wireless 3G will be fully deployed, and exactly what it will deliver. |
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