The first big issue for femtocell is increasing coverage.
We know network coverage is limited in mobile network. There are two main reasons for this.
1. Some areas have such a small population that it is not economical for an operator to install and operate a conventional base station
2. The high frequency mobile signals used in 3G systems are heavily attenuated as they pass through walls (3G networks need much stronger signals with low interference to provide high data speeds). In addition, the attenuation means that one indoor user consumes at least the same power as 10 outdoor users. In the other words, even if a user lives in an urban area, they still may not get coverage in all of the home.
Femtocells are significantly cheaper than conventional base stations so they can be installed in consumer's homes and even in the street to boost coverage.
The second big issue for femtocell is mobile broadband.
These days , we consume more traffic data and voice data. With mobile broadband traffic doubling every year, the strain on mobile networks is enormous. While mobile voice usage is approximately constant, data use is rocketing and the growth shows no signs of slowing down. Unlike their fixed cousins, mobile operators cannot simply roll out fibre-optic networks to increase capacity; the rely on radio spectrum, which is an extremely limited resource.
参考：Ingenia Articles
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