Finnish operator DNA has recently expanded its 3G network to 20 new municipalities, using 900 MHz network technology, which is suitable for sparsely populated areas. Its 3G services are currently available in over 250 municipalities, covering 4.2 million Finns. The operator offers one dual-band (900 and 2100 MHz) device, the DNA Mokkula E169 USB modem. DNA plans to construct 1,100 base stations this year.

The services were expanded in April-May, to Kristiinankaupunki, Kuhmalahti, Kustavi, Lapinlahti, Lemi, Nummi-Pusula, Padasjoki, Paltamo, Pukkila, Puumala, Pyhäntä, Pöytyä, Ristijärvi, Savitaipale, Taivassalo, Utsjoki, Uurainen, Viitasaari, Vöyri-Maksamaa and Ähtäri.

Hence, the number of municipalities in which DNA offers 3G passed the 250 milestone. The latest 3G expansions to new municipalities were implemented using modern 900 MHz network technology, suitable for sparsely populated areas.

3G services expanded first to larger municipalities and other population centres, i.e. areas where implementing network services with a 2 GHz frequency, the most common for the time being, is viable. After covering densely populated areas, we have expanded the network to more sparsely populated regions, where 900 MHz technology is more suitable. However, expansion of the 3G network within the 2 GHz frequency band is also continuing, says Tommy Olenius, the vice president of technology.

Mobile phones and other terminal devices operating in both frequencies are now available on the market. Hence DNA has introduced the new DNA Mokkula E169, which works within both frequency bands. However, most of the older devices currently in use, still operates only in the 2 GHz frequency band.

The 3G network and services have been expanded using 900 MHz technology, even to areas where they have already been implemented with the previous 2 GHz technology.

– For instance, in Espoo, Orivesi and Pori we are utilising both technologies. By combining them appropriately, we can enhance the network quality experienced by the users, which is the top priority for us when building the networks. Making both frequencies available simultaneously, we can ensure the best connection for our customers in all circumstances, independent of the terminal in use, continues Mr Olenius.

Network speed depends on several factors
Within DNA’s 3G network, the provided maximum throughput for a data subscription is currently limited to 2 Mb/s. The customer perceived data throughput depends on, for instance, the mobile terminal in use, the signal strength of the network and the number of simultaneous network users in the same area as the subscriber.
The result of surveys comparing network throughput capabilities depends highly on the monitored measures. For instance, the results of a Finnish network benchmark survey commissioned by Elisa in the spring 2009, did not consider the throughput restriction of the DNA 2M subscription. Therefore, this kind of surveys often gives misleading results and does not reflect the real customer experience of the networks.