Co-Channel Interference Measurement from Verkotan

Overview

Co-channel radio interference occurs when multiple base stations share frequencies at the same time. Today’s dense and heavily congested networks are one of the main factors of limiting network performance. The same problem appears in LTE, WCDMA, and even in GSM networks.

Verkotan’s in-house developed interference measurements

Verkotan has performed in-house GSM, WCDMA and VoLTE interference benchmarking for years. Verkotan offers Interference Performance Measurements with realistic channel models for city and highway environments. Data and voice call performance have their own test procedures.

Newest addition to our interference portfolio – LTE Data Throughput Performance with Base Station
Figure 1. Measurement Setup

To accurately estimate devices’ LTE data throughput in today’s congested networks, we have developed new measurement method. We are using real base stations to accurately simulate all the features of modern LTE networks, since radio communication testers have limited capability to test dynamic behavior of radio channel.

The test is based on 3GPP TR 37.976 Radiated MIMO Performance Test specification with some modifications. Major modifications are:

  • Using real base station
  • AWGN interference with varying arrival direction

 

 

Here we have some example results of our latest measurement. In this measurement, we compared two different smartphones.

Figure 2. Average throughput [Mbits/sec]
Average throughput measured with iPerf using TCP-connection for different noise levels. DUT B throughput is 10-13% worse when signal conditions are relatively good. At high interference levels DUT B is performing 8% better compared to DUT A.

 

 

 

 

Figure 3. 95% throughput limit [Mbits/sec]
To study connection stability we calculated 95% throughput value. This is connection speed which is reached 95% of the time. Values are reported for three the different noise levels. Again, DUT B is performing well in high interference condition and DUT A is performing well in low interference condition.

 

 

 

Figure 4. Average packet BLER for different noise levels

At low interference levels DUT B have slightly higher average BLER (Block Error Rate). On average about 9% BLER levels is archived.

 

 

 

 

Figure 5. Average MIMO Rank Indicator value reported by the DUT

 

Average reported MIMO rank indicator for different noise levels. DUT A is very seldomly indicating MIMO rank 2.

 

 

 

 

Figure 6. Average CQI values

At lower interference levels DUT A is reporting higher CQI (Channel Quality Indicator) values compared to DUT B. This is to compensate DUT A low MIMO rank.

 

 

 

 

 

Verkotan is happy to provide more detailed information and make a proposal, how we, at Verkotan can verify your devices in the global environment.

If you have questions, need assistance or want directly to contact our personnel, click here for personal contacts. We are happy to help you!

Direct sales contact: arto.salo@verkotan.com

One thought on “Co-Channel Interference Measurement from Verkotan

  1. Alextraum says:

    As the demand for Smart and IoT devices grows so too does the pressure on the active radio signals supporting those devices. This is due to the increased RF activity from the many different radio links that surround us in our daily life. And with that comes performance degradation issues due to interference, which is ultimately resulting in slow data rate performance, dropped connections and failed data sessions.

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