As users Internet wireless i ever think that a good signal should speed internet is also good. Actually this is a wrong assumption. At present, the speed of the internet is no longer a good set of signals obtained, the signal strength is not strong, but the quality of the signal obtained. Many people complain that the internet speed is slow but may signal a full 5 bars for example. Many cases like this, the full signal slow internet. To clarify why this was the case the first look at the picture below.
speed is obtained, and to the user it is influenced by several things, among others: speed modem (modem specifications), the condition of BTS, Network ISP traffic density, traffic density and the internet server bandwidth conditions. Whether it's speed EVDO Rev A, EVDO Rev B, HSDPA, 3G and the like only an access network, not over the modem to the BTS, while the Internet itself tens of thousands of kilometers jarakanya. But speed modem that actually attempted to maximum speed. Speed modem, we named the DRC (Data Rate Control) >> Requested Requested DRC.
Understanding Signal Interference and DRC Requested
In data communications (LAN), the received signal that the user is actually a composite of signals used for communication (carrier) and signal interference. Signal interference is a nuisance that can cause data communication signal error / defect. The stronger the signal, the higher the interference error data communications transmitted to the user. The high signal reduces interference will make the modem speed (DRC) to minimize the error rate.
Here's a simple way to explain what it is signal interference.
The picture above is a picture of the signal emitted each BTS in theory only. The pattern as shown above can occur if only in an empty plains or desert. If in other big cities because of the city's many large buildings that led to a greater level of signal interference due to signal reflection Reflected Ray. So the pattern is likely to occur irregularly, not the same as the picture above. Well, for a description of the picture above as follows.
Figure 1 >> Each BTS sector emits 3 pieces, known as PN (Pilot Number). Let's say one BTS emitting PN-A, PN and PN-B-C, the coverage of a sector often described in terms of six for ease in network engineering.
Figure 2 >> For more simply when seen from the picture above, the pattern of the transmit signal can not hexagons, each sector (PN) PN will intersect with another, that's it. Well, this incision area users will get 2 pieces of PN or more, then the modem will select the strongest signal as a carrier of PN, PN is another signal interference (bully).
Figure 3 >> There seems to be an area to get a signal with low interference and there are areas that get high interference. Comparison of Carrier and Interference Signals were used to determine the DRC Requested modem (modem speed). Explanation of Figure 3 is as follows.
- Area 1 is the best area, with a strong signal and low interference or no interference at all, DRC / Speed obtained will be high.
- Area 2 is an area with a weak signal but low interference obtained, lets get a decent speed. But if the location is too far from the BTS speed obtained will be low anyway and prone to interference from other base stations (neighbors).
- Area 3 is the area with a strong signal but also strong interference, in theory would speednya low / medium well. In this area you probably are, but if full modem signals obtained speed is very slow, due to the high levels of interference.
Relations parameters that influence the speed, it simply can be described as follows.
So now you know why the speed of your Internet slow when full signal. Great likelihood you are in an area with high interference. In this area the modem will get 2 or more pieces of PN. So to minimize the occurrence of more than 2 PN this then you will be required to perform pointing modem in order to have only 1 PN. One way is to use a tool called QXDM and QPST that I mentioned a little in the previous article. See also my article on what modems are already using Qualcomm chipset and could use QXDM.
