4g-cl-mimo-presentation v1 11.05.2015.pptx
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4GCL-MIMO TrialROT02, ROT03, ROT04 11 May 2015
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Contents
Introduction DT Analysis Recommendation
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Revisions
Date Version Author
11/05/2015 V1.0 Jean-Andre Sauget
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Introduction – MIMO Modes
Open-Loop MIMO and Closed-Loop MIMOIn the downlink, MIMO techniques are classified into open-loop MIMO and closed-loop MIMO based on whether UEs are required to report precoding matrix indicators (PMIs) for eNodeB downlink data transmission. Open-loop MIMO does not require UEs to report PMIs while closed-loop MIMO requires UEs to report PMIs.
The adaptive closed-loop transmission mode can be used to increase performance if most UEs are moving at low speed, PMIs reported by UEs are reliable, and demodulation performance is satisfactory in closed-loop transmission mode.There is little difference between open-loop and closed-loop 2x2 MIMO. The adaptive open- and closed-loop transmission mode is not suitable to all application scenarios. For example, when closed-loop transmission modes bring little gains compared with open-loop transmission modes and an open-loop transmission mode is selected, the adaptive open- and closed-loop transmission mode may bring losses compared with the adaptive open-loop transmission mode. Therefore, the adaptive open- and closed-loop transmission mode is not recommended.
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Drive Test Analysis
Drive Test Routes
Before After
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Drive Test Analysis
OVERALL DOWNLINK AVERAGE THROUGHPUT
- By comparing the average application throughput for the before and after DT, we notice a degradation when the feature is activated
Overall averages QoS Tester\Net Throughput\Current Netw. DL [kbit/s] : [1] QoS Tester\Net Throughput\Current Netw. DL Avg [kbit/s] : [1]
Before 28,203.25 30,149.37
After 25,230.55 25,976.25
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Recommendation
- We propose to keep the current setting of Open Loop MIMO, instead of Closed Loop MIMO
- Rollback the change in the trial clusters ROT02, ROT03, ROT04
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