This space on the ECO Forum aims at supporting the correspondence work on compatibility and sharing studies for WAS/RLANs in the frequency band 5925-6425 MHz.

The current version of the Draft ECC Report RLAN@6GHz is a result of the SE24 correspondence group on WI62 that previously dealt with co-existence studies with WAS/RLAN in the frequency band 5925-6425 MHz.

Sections 4.1 and 4.2 of the Draft ECC Report contain now the tables of parameters for FS and FSS proposed to be used in the co-existence studies with RLAN. These parameters were extracted from the existing ITU-R Recommendations and Reports and ECC Report 244.

The following update needs to be done by correspondence:

1. Consistency check between typical values in Table 2 of the draft ECC Report (FS Tx output power, Feeder loss, Antenna gain, and e.i.r.p.) --> Chairman, France
2. An update to Table 7 of the Draft ECC Report to reflect the current satellites in operation --> SES, INTELSAT

Once these two action points have been dealt with, Liaison Statements need to be drafted asking SE19 and SE40 for their guidance regarding the parameter sets proposed in the Draft ECC Report for FS and FSS systems and requesting any amendments or corrections.

Dear colleagues,

Broadcom and Qualcomm recommend that SE45 consider using the Winner II model for interference paths less than 1 KM in urban and suburban areas.  Please see attached justification. 

Best,

Chris & Tevfik

Dear colleagues,

As discussed before, ITU-R P.2108 is valid only for urban/suburban areas. Therefore, we propose to use rural clutter using P.452. By default, the rural clutter morphology is assumed to be village center since RLANs are generally used within buildings.  If the location is dominated by trees, a rural tree clutter morphology is assumed, instead.  The European Environment Agency’s Corine-Land Cover (CLC) raster database (https://www.eea.europa.eu/data-and-maps/data/clc-2012-raster) is used to categorize locations with deciduous trees, mixed tree forest and coniferous trees.

The P.452 assumes that for each rural clutter category there is an average clutter height and distance from the clutter.  From this geometry an elevation angle is calculated to the top of the clutter.  If the interference path elevation angle is above the elevation angle to the clutter, then there is no clutter loss.  Otherwise P.452 is used to calculate the clutter loss.  Additionally, no clutter loss is added for cases where the distance from the RLAN to the FS station is less than 10 times the distance from the RLAN to the clutter.

Attached slidedeck has more details on how the clutter category is selected using CLC data and implementation of P.452 clutter model.

Thanks.

Tevfik & Chris

Dear colleagues,

   In prior teleconferences the Monte Carlo distribution of RLANs was discussed, and in particular the exclusion of RLANs from coinciding with FS and FSS antenna locations.

   Having looked into the issue more closely, Cisco recommends excluding MC RLAN placement within one meter of FS and FSS antenna locations because FS and FSS antennas are mounted on structures.

Thanks,

Peter Ecclesine

Dear Colleagues,

as during the last meeting we considered the application of the WINNER-II model for certain interference scenarios, we had an off-line discussion with the SEAMCAT Technical Group (STG) Chairman to understand if SEAMCAT either already covers or could cover this model.

In fact, although we did not explicitly mention the possibility to use SEAMCAT for this purpose, it would be good if the tool could offer this opportunity.

Anyway, it turned out that the WINNER model (both phase 1 and phase 2) was considered in the past by STG. They will try to clarify further if/what is available at their upcoming meeting this week and let us know.

Kind regards,

Doriana

Dear Colleagues,

I´d like to share with you some updates further to the last SEAMCAT Technical Group (STG) meeting.

As a proactive approach to assist SE45, STG discussed and agreed on the possibility to include a propagation model plugin (PMP) in SEAMCAT for the WINNER-II propagation model.

In order to progress, STG would need to obtain the latest specifications of the model, noting that ITU-R Report M.2135-1 contains its description in section 1.3.1 (page 30). Ivica, our SE45 Chairman, has already started invstigating about the latest documentation available.

It should be noted that SEAMCAT plugins developed for v3.x.x already exist and STG intends to use them as appropriate.

STG plans to release the PMP in the v.5.3.0 test version.

Best regards

Doriana

Dear Colleagues,

Wifi industry would like to share two documents that would hopefully help with calibrating various FSS sharing studies.

The first file (wifi_to_fss_intelsat_33e_60e_mid_fss_link_budget_EU.xlsx) has parameters for 1000 RLANS located in Europe. Since there can be more than 1 overlapping satellite channel, there are more than 1000 entries in the spreadsheet. Lat/Long coordinates, Tx power, frequency, bandwidth, pathloss, clutter, building entry loss etc. are provided for each RLAN. The header (top row) in the file should be enough to decode the meaning of values in each column, but please e-mail me if you have any questions.

The second file (AggAvgLinkBudget.xlx) shows a simplified analysis for 4 satellites. The building entry loss and clutter loss averages are obtained by linearly averaging the values for each considered RLAN. As you can see in row 44, the results match our Monte Carlo simulation results within 1 dB (except one case, where mismatch is 1.26 dB). We were requested to provide average clutter and building entry loss only, but we thought sharing the complete analysis might be useful for anyone who does similar analysis. We are planning to contribute an input document for the next meeting which will include the analysis from this spreadsheet.

Best Regards.

Tevfik

Dear SE45 colleagues,

At its 61st meeting, STG received two implementations made by Ivica Stevanovic (OFCOM Switzerland) of the propagation models according to the latest documentation available from the Winner II project  and Report ITU-R  M.2135-1.

STG would like to forward this implementation to SE45 for validation and use in their coexistence studies within SEAMCAT.

STG took note that the next meeting of SE45 will be on 2-3 October 2018. Based on possible feedback from SE45 during its next meeting, STG is ready to include these two propagation models as built-in models in the propagation model library in the upcoming version of the software.

The two plugins are available in the attachment. To install them in SEAMCAT (please use version 5.3.0 Alpha 3), the user needs to click on the Library menu / Install JAR and select the plugins provided (files with extension ".jar").

After that, they will be available in the propagation model library. 

Kind regards,

José Carrascosa (on behalf of STG).

----

On 21/06/18 14:48 Doriana Guiducci wrote:
"

Dear Colleagues,

I´d like to share with you some updates further to the last SEAMCAT Technical Group (STG) meeting.

As a proactive approach to assist SE45, STG discussed and agreed on the possibility to include a propagation model plugin (PMP) in SEAMCAT for the WINNER-II propagation model.

In order to progress, STG would need to obtain the latest specifications of the model, noting that ITU-R Report M.2135-1 contains its description in section 1.3.1 (page 30). Ivica, our SE45 Chairman, has already started invstigating about the latest documentation available.

It should be noted that SEAMCAT plugins developed for v3.x.x already exist and STG intends to use them as appropriate.

STG plans to release the PMP in the v.5.3.0 test version.

Best regards

Doriana

"

Dear Ivica,