CoMP Increases 3G LTE Data Rates

CoMP Increases 3G LTE Data Rates

19th October , 2009


Europe : A new technology that can increase 3G LTE data transmission rates has been tested. The new technology is CoMP (Coordinated Multipoint Transmission ) and the first live field test was conducted by a number of companies (Alcatel-Lucent, Bell Labs, Deutsche Telekom Laboratories, Fraunhofer Heinrich-Hertz and Kathrein ).
By coordinating and combining signals from multiple antennas, CoMP, will make it possible for mobile users to enjoy consistent performance and quality when they access and share videos, photos and other high-bandwidth services whether they are close to the center of an LTE cell or at its outer edges.

The CoMP solution builds on Bell Labs pre-eminent research in wireless networking and takes advantage specifically of Network MIMO (Multiple Input-Multiple Output), a technique pioneered by Bell Labs that reduces interference in wireless networks and increases efficiency by tightly coordinating the transmission and reception of signals at multiple access points. The solution also reflects a commitment to open innovation and serves as a clear demonstration of the benefits that result.

The live tests were carried out in a downtown area of the German capital Berlin as part of a joint research project sponsored by the German Ministry for Education and Research (BMBF) called Enablers for Ambient Services and Systems (EASY-C). These are the first ever live tests of a technique that had been extensively evaluated for introduction in wireless networks around the world, but not previously tested in the field.

The tests showcased Coordinated Multipoint Transmission's key benefits:
- Helps improve bandwidth scalability by boosting transmission rates not only in the connection from the network to the user's mobile device (downlink), but from the mobile device to the network (uplink), a unique function that will become indispensable as Web 2.0 applications become increasingly prevalent and a growing number of users send videos and photos from their mobile devices.

- Improves quality of service by demonstrating consistently high transmission rates on the uplink from the phone to the network, even at the edges of a 'cell' where transmission quality is typically poor and difficult to maintain; data rates greater than 5Mbps were observed for the vast majority of locations.

- Maximizes the use of existing network infrastructure to achieve these higher transmission speeds without necessarily requiring deployment of additional antennas.

Transmissions between mobile devices and base stations during the field tests made use of the 2.6 GHz frequency band, which is expected to be the predominant band for introduction of commercial LTE services in Europe. Signals transmitted from mobile devices were received by two active remote radio heads deployed on two buildings located 500m from one another, then forwarded across an optical fiber link to a central unit comprising the modem and controller elements of an Alcatel-Lucent LTE base station (eNodeB). The signals were then combined with one another to increase the strength of the signal.

The configuration of this solution differs from that of basic MIMO primarily in the deployment and positioning of antennas. In MIMO, antennas involved in the solution are deployed on a single site. CoMP interconnects antennas deployed at a number of sites that are in proximity to one another.

Tight coordination of the transmission and reception of signals at these multiple access points reduces interference and increases efficiency.


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