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Six ways to make mobile networks perform better

Future mobile networks will use multiple technologies to almost reach 1Gbps

By Mikael Rickna$?s, IDG News Service
June 29, 2012 11:15 AM ET

IDG News Service - To achieve higher download and upload speeds, vendors and operators are planning to use a number of different technologies over the coming years in both HSPA and LTE networks.

At their core, many of these technologies are related to better coordination among base stations, and the introduction of smaller base stations to help networks keep up with an increasing volume of data.

OUTLOOK: Gauging the volume

However, many of these technologies will put even more strain on smartphone and tablet batteries. Another area where some smart thinking will be needed to ensure devices keep up with networks is antenna design.

"We have to trust that the technology will be improved" in these areas as well said Jan FA$?rjh, vice president and head of research at Ericsson.

Use multiple antennas at the same time

One of the key ingredients in the development of faster mobile networks is an antenna technology called MIMO (Multiple-Input Multiple-Output), which uses multiple antennas in the base station and on the device to send data.

Today, LTE (Long Term Evolution) networks use two antennas on the downlink, but future networks will at first be able to use four antennas, and then a bit further into the future eight. LTE networks that use the latter are already being demonstrated and can achieve speeds close to 1G bps.

The big challenge with MIMO is to fit all the needed antennas on the user device, especially on smartphones where there is little space to put them and still have enough distance between the antennas for the technology to be effective.

Use more antennas on the uplink, as well

Download speeds in mobile networks tend to get the most attention. But as more users upload information from mobile devices to cloud services and share photos via social networks, upload capacity is becoming more important, according to Ericsson.

Thanks to a technology called Uplink Transmit Diversity, users will be able to send data via two antennas to improve quality of the uplink connection and increase speeds or lower battery consumption, according to Jan Derksen , head of technical marketing at Ericsson Networks.

The improvements are achieved using the two antennas to aim the signal at a base station, a technology called beam-forming, according to Qualcomm.

Take advantage of spectrum in different frequencies

The speed a mobile network is able to achieve is closely linked to the amount of spectrum used; more spectrum equals higher speeds.

But spectrum is a limited resource, so the telecom industry has come up with a technology that circumvents that reality called carrier aggregation. The technology will allow operators to bunch together spectrum in different bands and use them as one data link.

At first, operators will be able to use frequency bands that are located next to each other, and then mix and match more freely, according to FA$?rjh.

The idea of using spectrum in the most effective way possible can be taken even further by making all bands technology neutral, allowing operators to turn off GSM if there are no users that need it and instead just use LTE, FA$?rjh said.

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