U900 Vs U2100 UMTS 900 provides superior coverage as compared to U2100. This is evident from the law of physics that : Electromagnetic wavelength is = (Speed of Light)/(Frequency of the electromagnetic waves) where speed of Light -­‐ 3x10^8 m/sec and is a constant Wavelength or distance traversed by any electromagnetic wavelength is inversely proportional to the frequency, hence U900 has better propagation characteristics as compared to U2100. Hence , it can be understood that 900 spectrum has better propagation characteristics than 2100. Additionally, U900 has better Receive signal (RSCP) at any given point as compared to U2100. Better signal strength means better CQI (Channel Quality Index) and lesser interference leading to higher user throughputs at indoors. In other words HSDPA coverage of U900 is better than U2100. Typically U900 cell coverage is almost twice the coverage of U2100 cell. Also, it has better in-­‐building penetration as compared to U2100. U900 has better 3G coverage in deep indoors, whereas users of U2100 network have high probability to fall back to 2G network in deep indoors under low coverage of U2100. Additionally U900 has better signal strength than GSM 900, as the better sensitivity of the base station in U900 band than in GSM 900. This makes U900 gives better voice calling experience. 1. Simulation results from GSMA (Global suppliers of Mobiles Association) shows that U900 has significantly better Voice and Data coverage as compared to U2100 and GSM 900/1800. 2. Slides from Qualcomm also clarifies the U900 advantages over U2100 and GSM 900 (http://www.slideshare.net/Garry54/umts-­‐900mhz-­‐overview?next_slideshow=1) 3. According to Ovum Consulting, in its summary report to GSMA, U900 benefits are highlighted below: