Multiflow for HSPA and Coordinated Multipoint for LTE provide better bandwidth
Today, my phone connects to one base station only
So far, my phone uses the strongest signal from the surrounding base stations. Weaker signals from other base stations only interfere. I get a good signal when I am close to the base station, but the further I move away, the weaker the signal, and the closer I get to other base stations, whose signals become stronger and interfere more.
Voice calls, SMS or email work fine
Once the signal of another base station gets stronger, my phone simply switches to the better signal. For my voice calls, SMS or emails, I don’t notice anything.
Video is choppy, music staccato
For smartphones transmitting data, weak signals and interference mean less bandwidth, so I get to wait longer for my video clip, or my music stream is staccato.
Geometry dilutes my signal
The geometry of circles dilutes the radio signals. As I move away from the base station, crossing the 25 yard line and then the 50 yard line, the base station signal needs to cover three times more ground, spreading itself thinner and thinner. So I and most other folks will, on average, be quite far away from any base station. This means my smartphone mostly needs to work with a weak signal.
Send two signal streams doubling throughput
The HSPA+ solution is using two base stations to send data along two different signal streams to the smartphone, improving my smartphone throughput by 50%.
Coordinate the base station signals
The LTE Advanced solution is to send the same signals from two base stations. Two things happen: I get more useful signals without higher energy levels, and I get less interference, because the second best base station signal is converted from interferer to bearer.
Coordinated Multipoint is LTE Advanced
The Coordinated Multipoint feature speeds up LTE networks and thus requires a 4G LTE device. For Coordinated Multipoint, LTE base stations need excellent timing coordination, algorithms that quickly evaluate reported signal quality, and all properly encoded in software.
Nokia Siemens Networks focuses on mobile broadband
Building mobile networks that make online video gaming on smartphones truly enjoyable is what we do at Nokia Siemens Networks for a living. So the next time you suffer from lag*, have your network use Multiflow for HSPA or upgrade to LTE Advanced.
Read more about the first ever demo of HSPA+ Multiflow on commercial infrastructure equipment delivering up to double the cell edge data speed.
*Lag is online gamer jargon for noticeable stutter of the video game.
This post is by Maik Braun from the Mobile Broadband team