summary

Wiring diagram

As shown in the figure below, on the basis of physical layer measurement, 5g NR analog base station (mt8000a) is extended to external server PC through optical fiber (supporting Linux system or windows system), 5g module is extended to client PC through USB network sharing, and finally iperf program is installed and run on server PC and client PC, so as to realize data filling and measurement of application layer.

Setting details

The control software interface settings of mt8000a are as follows (the figure above shows the ipdata measurement mode settings, and the figure below shows the NR server IP address settings).

Physical layer debugging

Continued（Technical article | influencing factors and implementation of 5g NR peak rate）, take the following frame structure as an example:

5ms single cycle: DDD ddsuu

D:GP:U（13:1:0）

At sub-6ghz, μ= The bandwidth is 1100MHz, the modulation mode is 256qam, the airspace resource is 4x4mimo, the expansion coefficient is 0.8, the downlink overhead is 0.14, and the peak theoretical rate of 5g NR can be calculated to be 1.86 Gbps. As shown in the figure below, the measured 5g NR downlink physical layer throughput data of a module is one thousand eight hundred and nine point one one seven Mbps。

Add APN

After the physical layer is switched on, the DUT network is shared to the client PC through USB, APN is added and connected, and the specific settings are as follows (after that, packet filling and measurement can be carried out):"Network and Internet settings" -- > "cellular" -- > "advanced options" -- > "add access point" -- > enter www.anritsu.com in the profile name and access point input boxes COM and save the settings.

Iperf filling and measurement

The serverPCThe filling results are as follows (taking Linux system as an example):

Measured maximum throughput of application layer

Continued（Technical article | influencing factors and implementation of 5g NR peak rate），Recently, a chip supports 95% duty cycle function, and the expected throughput value is 2.02 Gbps. Through joint debugging with the chip, its frame structure can be set as ddsu, where s (D: GP: U) is 11:1:2 (this frame structure is not specifically reflected in the expansion coefficient defined in 3GPP ts38.306). Under this frame structure, the maximum downlink throughput of the physical layer tested on the Anli mt8000a is 2.002 Gbps, as shown in the following figure:

At this time, the measured rate of UDP application layer is 1.95 Gbps.