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Advances in Mobile Telephony and Military Radio
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The concept for digital wireless and cellular voice and data is rooted in the late 1930s and 40s, when commercial mobile telephony and military radio systems reached production quality At that time, the US military began experimenting with radio frequency signal encryption for data, using it to send battle plans across enemy lines and naval fleets ship to shore Lamarr and Antheil began work on the secret" CDMA signal guidance systems that would eventually find a true home in wireless phones Meanwhile, in 1934, the US Congress created the Federal Communications Commission a regulatory body designed to manage landline interstate telephone business as well as radio spectrum the ether" required to make radio networks work The Commission began parceling out spectrum parsimoniously at first, giving priority to emergency services, government agencies, utilities, and other groups deemed helpful to people After World War II the FCC began to allocate radiotelephone channels for commercial use In June 1946 in St Louis, American Telephone and Telegraph and Southwestern Bell introduced the first American commercial mobile radiotelephone, the precursor to mobile wireless today Early Mobile Radio Telephone Systems (MTS) were plagued with crosschannel interference, forcing the carrier to restrict usage and the number of channels available for voice calls (Channels are important because they relate directly to how many communications sessions can be maintained by a radio tower at any one point in time and therefore directly affect the costs of transmission) Therein began an ongoing struggle for spectrum that has lasted right up until the present day, wherein carriers depend on technology breakthroughs boosting radio signal efficiency, for example to make better use of the crowded bandwidth available
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Roots of Cellular: MTS Voice Systems
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The earliest MTS system for voice utilized a honeycomb design prefiguring cellular systems The honeycomb consisted of one central tower and five receivers Combining signals from one or more receivers into a unified signal, the tower amplified them and sent them onto a toll switchboard This allowed roaming from one city neighborhood to the next Voice communications were half-duplex; one
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party talked at a time by pushing a handset button to talk, then releasing it to listen In MTS the base station frequency and mobile handset frequency were offset by 5 KHz, so that eavesdroppers could only hear one side of a conversation (an early attempt at privacy); a caller searched manually for an unused frequency before placing a call The systems were fairly reliable, but users complained of too few available channels The early MTS systems built the foundation for many cellular developments in years to come Bell Laboratories scientist DH Ring first articulated the cellular network concept with coauthor WR Young in 1947 Their technical memorandum outlined the essential elements of a cellular network including a network of small geographic parcels or cells," a low powered transmitter in each, a central switch, and frequency reuse Ring and Young predicted that a wireless system could optimize frequency reuse in small cells, thereby creating a blanket of wireless coverage This blueprint for cellular departed from existing mobile telephone systems that required the call to be transferred from zone to zone as the mobile unit traveled Instead, cellular switches the frequency it is placed on as the mobile unit moves (since frequencies change from cell to cell); hence frequency reuse became a trademark of the more efficient cellular systems
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In 1948 the Bell system unveiled the first transistor; this was a breakthrough that enabled radios to shrink down in size to small, handheld radio transceivers, enabling civil authorities to communicate easily with each other Public two-way radios with several frequency options became available In Stockholm, the first phone-equipped cars took to the road by the mid 1950s when pioneer Swedish telecom company LM Ericsson developed a mobile phone apparatus consisting of a receiver, transmitter, and logic unit mounted in the boot (trunk) of the car The system voraciously consumed battery power and was costly and impractical at first, but it set the stage for cellular car phones By the mid 1960s, new wireless equipment using transistors were brought onto the market, making analog mobile telephony, and ultimately, digital voice and mobile data feasible
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