RF Network Optimization

In LTE, time division duplexing (TDD) and frequency division duplexing (FDD) are typically used. If the cellular system is using two different carrier frequencies for the Uplink and Downlink, then the duplexing mode is called FDD. In this case, both the UE and the eNB can transmit at the same time. For FDD, a channel separation is needed to reduce the interference between the Uplink and Downlink traffic. RF Network Optimization should check the RF chain design that should provide enough out-of-band rejection in the transceiver. This can be accomplished using high-quality RF filters.
 

Typical KPIs in LTE networks:

 

RSSI: Received Signal Strength Indicator (RSSI) measures the wide-band received power within the specified channel bandwidth.

RSCP: Received Signal Code Power (RSCP) measures the received power on one code on the primary common-pilot channel (CPICH).

E_c / N₀ and E_c / I₀: The received energy per chip divided by the noise power density (E_c / N₀) (interference power density E_c / I₀) in the band.

BLER: Block Error Rate is used to measure error blocks within a specific
channel transmission as a measure of transmission quality.

CINR (C/(I + N)): Carrier to interference plus noise ratio power level. The CINR is measured in both the UE and eNB to determine the radio bearer to be used based on some predefined set of thresholds.

EVM: Error Vector Magnitude measures of the difference between the mea-
sured symbol coming out of the equalizer to that of the reference.

 

 
Our RF filters (only a small selection listed below) may help in optimization of your LTE network:
 

Frequency Range(MHz)	Insertion loss	Rejection	Return Loss/VSWR	Input Power
895-950	≤0.6dB	≥80dB @ 865-885MHz	≤-20 dB/1.22	≤300W
895-950 940-950	≤3.0 @ 895-897.5MHz ≤1.1 @ 897.5-898.5MHz ≤0.6 @ 898.5-905MHz ≤0.5 @ 940-950MHz	≥45dB Below 894MHz	≤- 20 dB/1.22	≤200W
895-950 940-950	≤1.5 @ 895-896.5MHz ≤0.5 @ 896.5-905MHz ≤0.5 @ 940-950MHz	≥45 dB @ 820-894MHz	≤-19dB/1.25	≤200W
885-895 930-940	≤1.2dB ≤0.8 dB	≥40 dB @ 870-880MHz ≥15 dB @ 905-920MHz	≤-19dB/1.25	≤300W
1710-1785 1805-1873	≤1 dB	≥60 @ 1880~1920	≤-19dB/1.25	≤300W

 

Please contact us for your specific project requirements: sales@oc2me.com