Uplink vs downlink frequency license#
Uplink vs downlink frequency download#

In this case, it's the user's phone, which has a size constraint and relies on small batteries, while base stations usually have much better electric supplies with not such strigent requirements.

You will check that the uplink frequencies are always smaller than downlinks'. This page compares Uplink vs Downlink and mentions difference between Uplink and Downlink. Take, for example, any of the UMTS FDD frequency bands. The fact that there is lack of reciprocity between uplink and downlink channels on different frequency bands makes the downlink CSI acquisition process. The UL goes from the user phone to a fixed base station. In this case, the situation is just the opposite. In the case of the UL, the so called 'ground segment' consist essentially of several-dozen-meter-diameter antennas with whole buildings for the data processing and electrical supply, so the extra attenuation due to higher frequency is not as meaningful. Since we have a power constrain, it seems logic to transmit in the lower frequency. Thus, they cannot use big power for transmission.Īs you very well stated, the attenuation is higher at higher frequencies. For this reason, their equipment is also limited: they don't have big batteries and get their power essentially from solar panels. Satellites are constrained by their weight, being the cost around several thousands of euros per kilogram. If we take the typical Ka-band for satellite communication, we see that the UL is around 30 GHz, while the DL lays around 20 GHz. I will distinguish between two cases in which Uplink and Downlink (UL and DL from now on) are interchanged. I would say it's all a matter of power consumption and handling capacity. If you could help me regarding the same, it would be very kind. I have searched almost everything (however, that's not possible). So, we require more bandwidth in DL than in UL and it can be attained only if DL freq.

Uplink vs downlink frequency download#

Generally, people download more than upload (however, its converging now). Hence, downlink frequency should be greater than uplink frequency. But due to the constraint on the amount of energy available on the MS battery, this approach is not feasible. So, in order to overcome the attenuation, MS has to transmit on high power. So, MS (mobile) has to transmit on uplink using higher freq. Hence, data is received as it should be (without attenuation). So lets suppose that BTS (as in case of GSM) transmits using low frequency on the downlink.

High frequency means higher attenuation.

But my seniors (in my company) seem not to be satisfied with the below answers. I was able to gather some answers as to why is so. Think of them as repeaters in space.Generally, downlink freq. Now, there are dozens of amateur radio satellites in space, and as a Technician you can make contacts by bouncing your signals off of them. It only lasted a few weeks before it dropped into Earth’s atmosphere and burned up, but it secured amateur radio’s place in space. It carried a small beacon transmitter whose purpose was to study radio propagation through the ionosphere.

Uplink vs downlink frequency license#

For example, one of the other cool things you can do with a Technician Class license is work the “birds,” otherwise known as amateur radio satellites.ĭid you know that amateur radio operators have been sending satellites into space since the early 1960s? The Orbiting Satellite Carrying Amateur Radio, or OSCAR I for short, was successfully launched into a low Earth orbit on December 12, 1961. This is fun for a while, but don’t get stuck just talking on the repeaters. When new hams get their licenses, they generally purchase a handheld transceiver (HT) and get on the local repeaters.