Some snippets from the article "Concerns over Capacity"
americasnetwork.com city.htm
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Verizon plans to introduce the 1X system, a 2.5G CDMA ‘enhancement’ which, he claims, will double the carrier’s network capacity and provide ISDN-like speed. "Further out," he says, "we’re likely to deploy the HDR [high data rate] platform for CDMA. That will support throughput rates of up to 2 Mbps."
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Clearly, however, the 100 Mbps downloads permitted by the standard could take up a lot of spectrum. For this reason, GPRS is not seen as a long-term solution by anyone. "GPRS is transitional," confirms Nilsson.
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EDGE is not proven technology at this point and, indeed, has aroused skepticism in some quarters. "Sixteen QUAM is very difficult in the mobile environment," says Phil Hester, Ericsson’s director of product and technical marketing for CDMA systems. An engineer at Lucent (who declines to be identified) also sees technical hurdles, but believes they will be overcome.
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Like GPRS, 1X is an interim standard. But where 3G GSM’s second phase, EDGE, has already achieved virtual consensus, CDMA’s evolution is less certain. CDMA developers have posited a 3X standard based on a carrier width of 3.75 MHz rather than 1.25 MHz, but not everyone believes it will be implemented.
"I don’t see it," says Verizon’s Lynch. "The requirement for a wider carrier bandwidth is a big impediment."
"There’s a lot of debate on 3X," notes Hester. "I think the HDR proposal is more likely to win acceptance. It keeps the current carrier width and has a burst capability of 2.4 Mbps with a 144 kbps continuous bit rate." |
