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Radio design played a role in improving spectrum utilization. The first systems, such as the one in St. Louis, used a scheme called nontrunked radio. In nontrunked radio systems, the available spectrum was divided into channels and groups of users were assigned to those channels. The advantage of this technique is that non-trunked radios were relatively inexpensive. The downside was that certain channels could become severely overloaded, while others remained virtually unused. The invention of trunked radio relieved this problem immensely. Trunked radios were frequency agile, meaning that all radios could access all channels. When a user placed a call, the radio unit would search for an available channel and use it. With the arrival of this capability, blocking became a non-issue. The downside, of course, was that frequency-agile radios, because of their more complex circuitry, were significantly more expensive than their nontrunked predecessors. Most of this work was conducted during the turbulent 1960s and led to Bell Labs introduction of Improved Mobile Telephone Service (IMTS). IMTS used two 30-kHz, narrowband FM channels for each conversation and provided full-duplex talk paths, direct dialing, and automatic trunking. Introduced commercially in 1965, IMTS is considered to be the predecessor of modern cellular telephony.
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Starting in the mid-1940s, mobile telephony went head to head against the television industry in a pitched battle for spectrum. In 1947, the Bell System proposed to the FCC a plan for a large-scale mobile telephone system, asking them to allocate 150 two-way, 100-kHz channels. The proposal was not accepted. In 1949, while the FCC wrestled with the assignment of spectrum in the 470- to 890-MHz range that would become Ultra-High Frequency (UHF) television, the telephone industry argued that they should be granted a piece of the electromagnetic pie. Their issue was that the 6 MHz of bandwidth required for a single TV channel was more than had ever been allocated for mobile telephony. Unfortunately, television had penetrated the American household; Captain Kangaroo, Roy Rogers, and Winky-Dink captivated viewers; and consumers were hungry for additional programming. Wireless telephony wasn t even on their radar screens; it would have to wait.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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In the 20 years that followed, mobile telephony continued to take a backseat to television. UHF usage grew slowly; in 1957, the Bell System petitioned the FCC to give them a piece of the earmarked spectrum in the 800-MHz range that was virtually unused. But television was still the darling of the nation, and the FCC was ferociously dedicated to expanding the deployment of UHF television. In 1962, the government signed into law the All Channels Receiver Act that mandated that all new televisions must have both Very High Frequency (VHF) and UHF receivers. Remember when televisions had two tuner knobs on them TV won again. Between 1967 and 1968, the FCC and the House of Representatives, under pressure from the telephone industry, studied the issue of spectrum allocation once again. In 1968, the FCC convened the Cellular Docket, a contentious and highly visible collection of lawmakers who eventually ruled that mobile telephony s concerns could only be solved by giving them spectrum. In 1970, the FCC reallocated UHF channels 70 to 83 from television to mobile services. From the resulting 115-MHz electromagnetic chunk, 75 MHz was allocated to mobile telephony, with 40 MHz available immediately and 35 MHz held in reserve. Once the spectrum was allocated, the political games began. It was roundly assumed that AT&T would design, install, and operate the wireless network as an extension of its own universal wireline network. After all, the spectrum allocation was deeded to the wireline telephone companies, and because AT&T provided service to roughly 85 percent of the market, this assumption was somewhat natural. Their Advanced Mobile Phone System (AMPS) architecture, based on the same design philosophy as the wireline network, relied on a massively expensive switching infrastructure, hundreds of cells, and centralized control of all functions. AT&T s only competitors in this market were the RCCs, mentioned earlier. Among them were Motorola, even then a large player in the industry. Initially, Motorola sided with AT&T, but when AT&T chose other vendors to manufacture the equipment required to establish the network, Motorola changed its spots and sided with the other 500 and some-odd RCCs in the country to sue the FCC for unfair treatment. Their suit called for the Commission to deny AT&T s application for the development of AMPS and to re-examine the spectrum allocation. In 1970, Motorola, in partnership with another large RCC, applied for permission to offer wireless service in Washington, D.C. After examining the petition, the courts decided that the answer to the industry s woes lay in a competitive market. In 1980, they began another cellular rulemaking
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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