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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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