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Friday, February 15, 2008 Mobile Carriers See Gold in FemtocellsIf consumers buy in to private wireless phone networks, the industry could save money. By John Borland
On its face, it sounds like a company's technological fantasy: a product sold to customers that will also save the business itself money. That's roughly the attraction of a young wireless phone technology called femtocells, which promise to give homes and businesses their own private wireless phone networks. Similar in concept to the Wi-Fi routers that many people use to blanket their homes with wireless Internet access, these little boxes instead provide a network for carrying the voice and high-speed data services of mobile phones. They're designed to give bandwidth-hungry cell-phone subscribers the strongest possible connections at home. But by keeping those customers off the main mobile network and using home broadband connections to transfer data, they could wind up saving the phone companies money, too. It's no wonder, then, that equipment vendors say that mobile phone companies are rushing into this market--with technology and even commercial trials beginning on both sides of the Atlantic--even before standards have been set or final technological hurdles cleared. "Usually in the networking business, you build equipment, and then drum up demand," says Paul Callahan, vice president of business development for Airvana, a femtocell equipment vendor. "This time, demand is already really strong." The femtocell buzz is part of a broader, years-long push by mobile phone companies to persuade their customers to use cell phones instead of landlines for all their communications needs, and increasingly to use their cells for third-generation (3G) applications such as Web surfing, downloading music, and watching videos. One hurdle, phone companies say, is that mobile phone coverage inside homes and businesses often isn't as good as it is outside. Some homes are in coverage shadows or have thick apartment walls that impede transmissions. In addition, the Wideband Code Division Multiple Access (W-CDMA) technology used for 3G services by T-Mobile and AT&T in the United States transmits at a higher frequency than does its predecessor, so it has a harder time penetrating walls. A femtocell would relieve this problem--in theory. Instead of relying on the mobile phone's nearest cellular tower (known in the industry as a base station), which might also be serving scores of other callers at the same time, a customer would have her own private, high-quality cell-phone connection. "Our goal is to get to a place where our services are available to all users at all times," says John Carvalho, head of core network innovation for Telefónica O2 Europe, which announced femtocell trials this week. Boosters of the technology paint femtocell as technology that benefits everyone. Customers get a fast, reliable broadband phone connection at home, and the mobile phone companies get to offload a small piece of their infrastructure investments to their customers. In effect, every customer who buys and installs his own home femtocell would reduce the load on the carrier's local macro network. The femtocell itself serves as an alternative base station, broadcasting and receiving ordinary wireless signals from cell phones that the femtocell owner permits. This is a strikingly attractive idea, particularly to carriers in big cities that find their networks often overloaded, and find that local regulations or public opinion makes it difficult and costly to set up new antennas. By using a femtocell, customers will send their voice and data traffic out their own DSL, cable, or fiber connection to the Internet, and then to the carrier's network. This will also reduce the load on the land-based data networks that carry voice and data traffic from the mobile phone companies' base stations to their own central switching facilities. That, in turn, could translate into less infrastructure investment. Yet all of this will happen only if customers see enough benefit to buying themselves a femtocell--and for now, that's the biggest flaw in this rosy scenario, analysts say. "What's in it for the user?" asks Keith Nissen, an analyst with the In-Stat research firm. "That's the big question. Right now, there isn't enough." |
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Android Calling
02/19/2008
Massachusetts Institute of Technology
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mobile phones