We also have on record about 5000 actual measurements where we have replaced indoor antennas with outdoor antennas for operators which show even larger signal increases – very likely due to antenna gain.įor LTE the improvement in de-correlation between the MIMO antennas also contributes to speed increases. I have a detailed paper with credible references which confirms these numbers. This increases RSSI, SNR and other parameters by the same amount. You also need to remember that an outdoor antenna typically increases received signal by 15 dB to 25 dB. Generally, data rates can vary by about 10x from Low/Poor to High/Very good on HSPA RSSI measures both the usable signal and the noise in a single figure. The dBm scale is roughly between -50 and -120dBm, with -50 being perfect signal and -120 being when you fall off the network. Signal strength only increases with a single antenna or two antennas without much de-correlation can give about 10 times speed improvement. Generally, up to 20 times speed increases are possible between bottom and top when combining increased signal with de-correlated MIMO antennas. Where N is the number of Resource Blocks of the E-UTRA carrier RSSI measurement bandwidth.
RSSI – Represents the entire received power including the wanted power from the serving cell as well as all cochannel power and other sources of noise and it is related to the above parameters through the following formula: The RSSI is not that relevant for LTE, but could be calculated as below:
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