Hello friend!
The value of Ec/Io fluctuates (varies), as well as any wireless signal. If the value starts to get too low, you start to have dropped calls, or can not connect. But what then is a good range of Ec/Io for a sign?
In practical terms, values of Ec/Io for a good evaluation of the network (in terms of this indicator) are shown in the diagram below.
A composite Ec/Io ~ - 10 db is a reasonable value to consider as good.
Note: See we are talking about negative values, and considering them ‘good’. In other words, we are saying that energy is below the Noise (and still have a good situation).
This is a characteristic of the system itself, and Ec/Io ‘most negative’ or ‘less negative’ is going to allow assessment of the communication.
In situations where Ec/Io is very low (high negative number), and the signal level too (also high negative number), first we need to worry in enhancing the weak signal.
Another typical situation: if the measured Ec/Io is very low, even if you have a good signal level, you can not connect, or the call will drop constantly.
I hope you’ve managed to understand how the Ec/Io is important for CDMA and UMTS. Note, however, that this matter is very complex, and supplementary reading - books and internet - can further help you become an expert on the subject.
Anyway, the content displayed serves as an excellent reference, especially if you’re not familiar with the concept of signal over noise for CDMA and UMTS.
Thanks!
