1. TSG RAN WG4 meeting #74bis Rio de Janeiro, Brazil, April 20-24, 2015
MIMO OTA Way Forward
Intel Corporation, []

2. 1. General/Scope Decision on SIR control
A call for papers on operators’ views on SIR control in the MIMO OTA specification was requested for this meeting, and no papers were received
An adhoc discussion on this topic resulted in no consensus to include SIR control, although it is known that two operators have stated their position in the affirmative
As a working assumption, a potential SIR control definition is deferred to a later stage after the harmonization process concludes

3. 2. Harmonization testing campaign
The harmonization test plan in R has been approved
A number of proposals on participating test labs have been discussed, and it has been proposed to hold an offline conference call prior to RAN4 #75 (date and time TBD)
Data templates for submission of raw data per methodology are requested from the respective test solution providers for review during the offline call
An investigation into antenna topologies of the proposed devices in the test plan is requested to be performed by Motorola Mobility and prepared for review during the offline call
Logistics, such as procuring devices and handling shipping to test lab(s) will be defined during the offline call
An initial list of devices is proposed in the test plan
Input on potential additions or modifications of this list is requested prior to the offline call
The testing campaign shall start following the offline call (allowing for shipping of the devices to the test lab(s))

4. 3. Proposed offline call agenda
Review proposals on participating test lab(s) and reach a decision
Review methodology raw data templates and agree on formats
Review investigation into antenna topologies of the proposed devices
This investigation shall be on a best effort basis, and subsequent discussions on device availability will not jeopardize the start of the harmonization effort
Agree on logistics aspects, such as procuring devices and handling shipping to test lab(s)
Finalize the list of devices to be used in the testing campaign
All potential agreements made during the offline call shall be captured via the RAN4 approval process

5. 4. MU Working Assumption for Harmonization
The following working assumptions on MU bounds per methodology are proposed:
The bound shall be defined prior to the analysis of harmonization results with a view toward agreement during RAN4 #76
If a method cannot contribute to the definition of this bound, it shall not be considered
The MU working assumption shall be applicable only within the context of the harmonization testing campaign
If a potential device-independent (and, possibly, band-specific) fixed offset between the figures of merit generated by different methodologies is found, then the MU working assumption shall be applied after such an offset is applied

6. 5. Measurement uncertainty
Contributions are requested from the test solution providers to define MU elements with a view toward developing the MU budget for each methodology
The MU budgets per methodology shall be defined prior to the analysis of harmonization results with a view toward agreement during RAN4 #76

7. 6. Topics for RAN4 #75 General Harmonization Measurement uncertainty
Potential analysis of initial results
Reach decision on sanity check procedures identified in the harmonization test plan
Measurement uncertainty
Development of MU elements and MU budget per methodology