What is the difference between ec io and ec no

Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Next SlideShares. Faraz Husain Follow. Rf optimization.

What to Upload to SlideShare. Related Books Free with a 30 day trial from Scribd. Related Audiobooks Free with a 30 day trial from Scribd. Hesam Mosalli. Pra Youdha. Rupam Karmakar. Zahir Naqvion at Soo Shim Taekwondo. Shawky Menisy at Etisalat Misr community. Prasun Mallick. The lower the level of RSCP then the more chance there is of degradation in the signal, and the more chance of noise being introduced as external sites shooting into the area have a greater effect on the S?

N ratio. Hi all, I am an RF Engineer n trying to learn 3G architecture n its parameters on my own through self study. Name required :. Mail will not be published required :.

Microsoft Excel add-in lifetime licence. Eight Erlang functions to use in your own worksheets, plus prebuilt Erlang calculators. Exact matches only. Search in title. Search in content. Search in excerpt. This topic has 62 replies, 1 voice, and was last updated 7 years, 8 months ago by hela. In terms of values, and talking logarithmicly, if any ratio is less than 1, then the value is negative.

If greater than 1, positive. It is measured at the input of receiver NodeB, UE, etc. It is measured at the output of receiver NodeB, UE, etc. A more natural question would be: why we can not simply use the Signal Strength measured by the mobile as a guide for operations such as handover?

The answer is simple: the measured signal level corresponds to the Total RF power - All cells that the mobile sees. So we need another quick and simple measure that allows us to evaluate the contribution of each sector individually. We used to measure the pilot channel signal of each sector to assess the quality: if the level of the pilot is good, then also are good levels for the traffic channels for our call in this sector. Likewise, if the pilot channel is degraded, so will the other channels including traffic be, and it is best to avoid using the traffic channels in this sector.

Each sector transmits a certain power. Suppose in our example we have a pilot channel power setting of 2 W, and a power of other control channels also fixed at 2 W. Now assume that several traffic channels are busy eg use 6 W for traffic channels.

Let us now consider another situation. Instead of one, we have five sectors signal arriving at the mobile for simplicity, all with the same level of dBm. This situation where we have many overlapping sectors, and with the same level of signal is known as Pilot Pollution - the mobile sees them all at once - each acting as interferer to each other.

The solution in such cases is to eliminate unwanted signals, by setting power parameters or physical adjustments tilt, azimuth , leaving just dominant signals which should exist at this problematic place.

If the value starts to get too low, you start to have dropped calls, or can not connect. In other words, we are saying that energy is below the Noise and still have a good situation. Note, however, that this matter is very complex, and supplementary reading - books and internet - can further help you become an expert on the subject. This is a very important measure, which somehow ignores the overall strength of the signal, and focuses on how best to evaluate the pilot channel signal is desired, in relation to noise that interferes with it.