Data Throughput

Tips from 3GPP

TR 37.901

This is TR (Rechnical Report), not TS (Test/Technical Specification). So it is not requirement, but you would find a lot of practical information tips from TR from TS. This is pretty thick reports, so it would take some time for me to go over the whole volumn. I would keep updating.

There are many items that is similar to what I already described in other posts. Here, I would put those portions that has not been mentioned in other post and would be a helpfu tips.

< Signal Levels >

It has been shown across different radio designs that the data performance can vary significantly due to LNA switch points which may impact the percieved SNR to the modem and thus impacting the end user perception of throughput performance even in a strong signal environment. Therefore, it is proposed to use a power sweep test to characterize the UE performance. Also, in order to exercise the hysteresis associated with the LNA switch points under realistic RF conditions, it is proposed to make use of a vehicular fading profile.

< Noise and Interference Levels >

In order to assess the end user perception of UE application Layer Data Throughput, it is desirable to vary Ior/Ioc over a range of values that are representative of the majority of the conditions experienced by the end user.

< Lower Layer (PHY) Testing >

In order to make sure the entire protocol stack is tested with regard to implementation errors and mismatch under transport block size variability and fast variations similar to what occurs in the field tests under live conditions, relevant fading scenario that triggers these variations should also be included.

< Higher-layer impact on application layer throughput >

Some lower layer (Phy) condition can influence higher layer operations (e.g, RLC retransmission). So it is a good idea to come up with some test setup that can test various aspect of higher layer processing capability by changing lower layer condition. Some of the test example is surmarized in following table.

Note : According to the document, Geometry is defined as C/I.

< LTE Test Parameters >

< Table A.3.1-2: Common Test Parameters (FDD) >

< Table A.3.1-3: Common Test Parameters (TDD) >

< Table A.3.2.1.3-1: Test Parameters for SIMO Downlink Testing >

< Table A.3.2.1.3-2: Test Parameters for SIMO Downlink Testing >

< Table A.3.2.2.3-1: Test Parameters for TxDiversity Downlink Testing >

< Table A.3.2.2.3-2: Test Parameters for TxDiversity Downlink Testing >

< Table A.3.2.3.3-1: Test Parameters for Open Loop Spatial Multiplexing Downlink Testing >

< Table A.3.2.3.3-2: Test Parameters for Open Loop Spatial Multiplexing Downlink Testing >

< Table A.3.2.4.3-1: Test Parameters for Closed Loop Spatial Multiplexing Downlink Testing >

< Table A.3.2.4.3-2: Test Parameters for Closed Loop Spatial Multiplexing Downlink Testing >