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range of radio frequencies for radio telephony

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ravitejafe
range of radio frequencies for radio telephony

In the early 1970s, following years of resistance to the idea, the Federal Communications Commission (FCC) began setting aside a range of radio frequencies for radio telephony. Near the end of that decade, a trial of cellular phone technology had been conducted in Chicago, and the world’s first commercial cellular phone service was introduced in Tokyo, Japan.

By the early 1980s, the FCC was issuing wireless telephony licenses and setting up metropolitan and rural jurisdictions (so-called metropolitan statistical areas and rural service areas), and, by the middle of the decade, first-generation wireless systems were being deployed in the United States. These systems were based on analog cellular technology using the advanced mobile phone system (or AMPS) technology that had been developed by Bell Labs. Cellular technology was being deployed in other countries, as well, although the technology and standards adopted internationally were very different from those used in the United States. Thus began one of today’s most vibrant and competitive industries—competition among wireless providers in today’s market is fierce, and new products and services emerge almost on a daily basis now.
All of the participants in the telecommunications value chain could, in principle, invest in research, but the nature of those investments would likely differ because of varying motivations and incentives. Traditionally, investments in research by end users (the demand side)15 seeking to improve the technologies available from providers and vendors (the supply side) have been the primary source of fundamental and long-time-horizon results that are much more likely to enter the public domain, making them available to all and increasing their impact. Open access to such results is particularly important for telecommunications, given that the value of a communications network grows with the number of its users, with more widely adopted and standardized technologies bringing greater benefits to all users.

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As a result of the structural changes in the telecommunications industry, the source of funds for investing in research has shifted from the demand side—telephone customers who paid for Bell System research via a tax on telephony usage—to the vendors of equipment, software, and chips, although the U.S. military (through DARPA, the Army, the Navy, and the Air Force) continues to be a major source of investment in telecommunications research. Currently, end-user organizations and commercial intermediaries are investing very little in research (an exception is AT&T, which has maintained a vestige of Bell Labs but has cut that back substantially, due to dramatic reductions in traditional telecommunications revenues over the past 3 years, from a support level of close to $140 million in 2001 to a support level of below $60 million in 2004).

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