Smartphones need more coverage and better capacity
Smaller cells step in to fill the gaps indoors and in hot zones. But how can operators get better capacity and coverage from existing macro sites, when users are unevenly spread out within the area?
Signals spread over the cell sector
The signal transmitted from an antenna spreads over a cell, and very little reaches any given smartphone. For the smartphone to achieve a high data rate, either interference must be lowered or the signal increased. The latter is what active antennas do by focusing the beam on users.
Active antennas focus beams
Active antennas integrate power amplifiers, receivers and other radio frequency (RF) components directly into the antenna dipoles to form the beam. Thus phase and amplitude from each radiating element inside the antenna can be electronically controlled using signal processing.
Vertical beamforming doubles cells
Vertical beamforming can be used to create two cells per conventional cell sector; this can make a single cell act as two, for example a macro and a micro cell, boosting capacity by up to 65% in a given area.
Supporting different carriers, bands or operators automatically
Operators can tune carriers independently, for example by focusing the higher frequencies on a smaller cell area. This increases peak throughput by providing a stronger signal while lowering interference.
Active antennas can be tilted independently by carriers, but also by GSM, WCDMA or LTE band. And active antennas can be used to share transmission power between operators using the same antenna. Signals for different operators can be tilted and resources can be allocated independently to meet different subscriber densities.
Beams track users automatically
As part of self-organizing networks, beams follow users automatically and optimize antenna parameters according to traffic mix, cell location and user demands.
Nokia Siemens Networks boosts mobile broadband
Building mobile networks that give users the best experience is what we do at Nokia Siemens Networks. Operators who would like to boost data speed, should therefore ask for active antennas to speed up their network.
This post is by Maik Braun from our Mobile Broadband team.