The advent of Femto Cells

Home base station solutions, also called Femto cells have recently attracted a lot of attention. The idea is to give the mobile user a small box similar to wireless routers, which provides mobile cellular coverage at home. But why would mobile operators want to do that?

In order to answer this question, one has to look at what mobile operators are competing against. Fixed line carriers and DSL service providers are seriously threatening the mobile business by offering new products centered around Fixed Mobile Convergence, which in essence utilises wireless access technology to capture mobile users when at home, and divert their mobile originated voice and data calls to the fixed line network.

Mobile operators found themselves in a predicament: the traditional Macro cellular networks are not able to compete with what DSL service providers can offer, neither from a cost structure point of view, nor in terms of access speeds. (of course the mobile operators are partly to blame because they picked the wrong battle by trying to compete on the basis of access speeds rather than mobile centric applications).

A home base station or femto cell can help mobile operators in many ways. First they can compete directly with other home access solutions which rely on other types of access technology such as WiFi or WiMax. This is because low cost mobile handsets are widely available, whereas dual mode handsets with WiFi capabilities are pricey and still limited in variety.

The femto cell will also enable the operator to cater for subscribers where the service is most needed. Compare this with traditional macro deployment where the infrastructure is first built in places where subscribers are “likely” to appear and even before subscribers start using the network. A femto cell also circumvents the issue of outdoor-to-indoor propagation which typically kills the capacity of 3G and 3.5G systems.

The deployment costs associated with a femto cell are marginal in comparison with Macro cell deployment. This is because the customer is providing the “real estate” to keep the box, the power, as well as the backhaul (e.g. DSL subscription). I don’t assume here that Femto cells will replace the macro layer, nevertheless the extent of investment in the macro layer will be considerably less.

Femto cells will also enable the operator to offer creative and disruptive tariffs to directly compete with fixed line. Home zone offers can also be more effective than traditional home zone offers using macro cells which extend for kilometers sometimes (because they rely on a cell ID parameter).
Both Epen and Martin made valuable comments on my last posting, so I thought that expanding some of the ideas is in place.

From the consumer point of view, reduced call prices are definitely an important aspect of Femto cells. As for the interference aspect, whether Femto cells will cause more or less interference to Macro cells is debatable. On one hand the signal will be contained within indoors. On the other hand it is likely there will be so many of them. Also, there has to be a reasonable signal penetration into (or out of) buildings to facilitate handover between the two layers.

Will DSL providers get a piece of the pie? It depends who the DSL provider is. As Martin suggested, there are many operators buying DSL assets and are thinking of service “convergence” on the long run. If you are a mere DSL provider, your business model is unlikely to be affected much with Femto cells. Somebody is paying for the DSL subscription (could be the consumer, but could be the operator too), and that’s all that matters. If you are someone competing with mobile operators (e.g. BT), then it is likely they will put any hurdle they can think of in the way of Femto cells, unless they make some money out of it.

Femto cells will definitely face fierce competition. If mobile operators loose the battle, at least they can claim that they tried, instead of sitting back and watching the market slip away. They may well loose, but they will loose more by not trying.

There are many handsets with WiFi capabilities around. Whether someone would want to use Skype and ditch the conventional mobile network is a matter of personal preference. For the time being, only technology suave people with love of experimentation do this.

There are also many hurdles that internet based VoIP (e.g. Skype) has to pass before it is adopted on a full scale for mobility. For example, seamless call transfer between the home cell and Macro layer can not happen if you use a simple VoIP routed over the internet: the mobile operator has to be involved somehow. This makes the Femto solution more appealing, because the call is managed easily and seamlessly.

It is not perceived that wireless calls over WiFi will pick up on a large scale, simply because powerful operators (who by the way spent billions on spectrum) will not allow it to happen. So the issue of mobility support is intertwined with the spectrum license and the regulatory aspects associated with it. For example it is not permitted to support mobility on a system using the fixed wireless broadband spectrum in UK.

All in all, here is a summary of all the factors that will influence the Femto cell strategies going forward:

    * License: Is it needed, who owns it and what does it cover? What spectrum?
    * Mobility: Will seamless communication (handover,routing of incoming and outgoing calls) be part of any competing solutions?
    * Content: who has control of it, and how much will it cost to access it?
    * Backhaul: who controls DSL backhaul?
    * Regulatory: how will the spectrum be allocated and what are the conditions attached to it by the regulatory bodies?
    * HW costs: What volumes? Economies of scale? Cost in handset or router?
Indeed… only time will tell.

Posted by Housam Housami

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