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eLTE low uplink throughput analysis

Publication Date:  2016-09-16 Views:  412 Downloads:  0
Issue Description
From A customer, they had tested the throughput in different locations. The uplink throughput is a little low.
Alarm Information

NA

Handling Process

1,Check the data below as an example, the uplink throughput is fluctuated at the same position, while at the same time the downlink is stable.


2,     Check the UL interference trace in U2000.
We made trace in this eNodeB, there is no interference. check the results of the trace

3, We delete the data with the explicitly abnormal .The SINR> 10dB and UL throughput< 0.83Mbps, there are 139 records. There are 574 records left.

4, Analysis of the data

When RSRP < -120dB, the mean throughput is 0.08 Mbps. There are 98 records.

The mean SINR is 2.72, the record is as below:

When  -115dB <=RSRP <= -120dB, the mean throughput is 0.122 Mbps. There are 116 records.
The mean SINR is 7.13, the record is as below:

When -110dB <= RSRP < -115dB, the mean throughput is 2.45 Mbps. There are 55 records.

The mean SINR is 12.3, the record is as below:

When -110dB <= RSRP < -105dB, the mean throughput is 2.53 Mbps. There are 112 records.

The mean SINR is 17.5, the record is as below:

When -100dB <= RSRP < -105dB, the mean throughput is 4.07 Mbps.

There are 111 records.

The mean SINR is 21.3, the record is as below:

When -90dB <= RSRP < -100dB, the mean throughput is
7.5 Mbps. There are 95 records. The mean SINR is 26.6, the record is as below:

When  -90dB <RSRP,
the mean throughput is 9.1 Mbps. There are 10 records.

The mean SINR is 30.4,the record is as below:

In summary, the data statistics is as below:


 

RSRP


 

 

Mean Throughput (Mbps)


 

 

Mean SINR (dB)


 

 

Test Record Count


 

 

-90dB <RSRP


 

 

9.1


 

 

30.4


 

 

10


 

 

-90dB <= RSRP < -100dB


 

 

7.5


 

 

26.6


 

 

95


 

 

-100dB <= RSRP < -105dB


 

 

4.07


 

 

21.3


 

 

111


 

 

-105dB <= RSRP < -110dB


 

 

2.53


 

 

17.5


 

 

115


 

 

-110dB <= RSRP < -115dB


 

 

2.45


 

 

12.3


 

 

55


 

 

-115dB <= RSRP <= -120dB


 

 

0.122


 

 

7.13


 

 

116


 

 

RSRP < -120dB


 

 

0.08


 

 

2.72


 

 

72


 

Abnormal test data statistics:


 

RSRP


 

 

Mean Throughput (Mbps)


 

 

Mean SINR (dB)


 

 

Test Record Count


 

 

-100dB <RSRP


 

 

0.01


 

 

26


 

 

1


 

 

-100dB <= RSRP < -105dB


 

 

0.29


 

 

19.7


 

 

11


 

 

-105dB <= RSRP < -110dB


 

 

0.226


 

 

16.0


 

 

35


 

 

-110dB <= RSRP <= -115dB


 

 

0.19


 

 

12.6


 

 

92


 


From the statistics, we can conclude, there are 2 main reasons for the low uplink throughput.

1.       The low signal RSRP.

2.       Uplink test abnormal data record.


























Root Cause

1.      The low signal RSRP.

2.      Uplink test abnormal data record.




Solution

1.     Use eA260 external antenna. We can check the test data from laboratory, the external antenna has a better RF receive gain than internal antenna.

In cell center position


In cell middle position:


In edge position:

 

2.In the test, make sure all the test data is usable. We recommend to use iperf tool for uplink and downlink UDP throughput test at the same time, and we can use the Iperf tool for recording the test data.

3.  Optimize the RF network, make sure there is a better wireless coverage









Suggestions

In the test, make sure all the test data is usable. if can use iperf tool for uplink and downlink UDP throughput test at the same time, then  we can use the Iperf tool for recording the test data.

Optimize the RF network, a better wireless coverage can provide better thoughput




END