2024-09-11 Population Density Data - Meeting Minutes

CAMARA Population Density Dataย APIย - Follow-up meeting #14 - 2024-09-11

September 11th, 2024

Attendees

Name

Company

Name

Company

Gregory Lindner

Ericsson

Sachin Kumar

Vodafone

Rafal Artych

DT

Violeta Gonzรกlez

Telefรณnica

Jorge Garcia

Telefonica

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Population Density Dataย APIย minutes:ย https://lf-camaraproject.atlassian.net/wiki/display/CAM/Population+Density+Data+API+Minutes

Agenda

  • Approval of previous meeting minutes #13 and meeting agenda

  • Open issues and PRs

    • Issues: #12 #35 #37 #38 #39 #40

    • PR #25 #44 #45 #47

  • Initial algorithm proposal review

  • Timeline and next steps

  • AoB

Open Issues & PRs

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Issue#12

Telefonica

Discussion onย APIย algorithm - Initial proposal

Issue#35

Telefonica

Readiness checklist

Issue#37

Telefonica

Basic API Test Cases

Issue#38

Telefonica

API Code commonalities validation

Issue#39

Telefonica

API documentation

Issue#40

Ericsson

Area Data-type

PR#25

Telefonica

Documentation of API Algorithm

PR#44

Telefonica

Create API Test Plan proposal

PR#45

Telefonica

Create r1.2 PR (Meta M4)

PR#47

Telefonica

Align with Commonalities subscription model

Approval of previous meeting minutes & documentation (1)

Meeting Minutes #13

โ†’ Approved

APIย proposal review (2)

Issue#35

Include the checklist for meta-release Fall24, including documentation, ATPs and alignment with commonalities (0.4.0)

Item splitted into the following issues to track each item. To include proper scope for meta-relase.

AP:ย define properly the exact scope referencing the different issues.

Status: PR#36 merged, table will be updated with new status

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Issue#37

Include basic ATP for the population-density-data API, including base test-plan and related documentation

AP: PR#44 to be merged

Status: Finishedย and closed

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Issue#38

  • Confirm API definition โ†’ Current version confirmed

  • Design guidelines from Commonalities applied โ†’ย 

  • Guidelines from ICM applied โ†’ย 

AP: Final change required to align with subscriptions, included in #47

Status: Finished. and closed

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Issue#39

  • API versioning convention applied โ†’ done

  • API documentation โ†’ validate current documentation and (optionally) finalize the review of the algorithm description

AP:ย Gregory to review and validate current documentation.

Status: Finished and closed

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Issue#40

Issue opened in commonalities for the alignment on how to define the area types along all the APIs in CAMARA.

AP:ย provide direct feedback on the commonalities issueย Issue #242. Groups is ok to create a homogeneous definition of the area types, as long as each API can later select granularly which types apply (and not getting obligation to support all the types, or getting involved in a complex data model).

Status: Delayed until september, following commonalities track.

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PR#44

Including the API Test Plan proposal, updated also in wiki tracker

AP: Reviewed, to be merged after final confirmation

Status: Agreed and merged

PR#45

PR for meta M4, including public release. REQUIRES FIRST MERGING #PR44 and #25 (to include also algorythm)

AP: Both merged, but pending on final review

Initial algorithm proposal (3)

Issue#12

K-anonimization to be clarified (in which step it is implemented)

New wording agreed for step 5:

5. ย  ย Distribution and aggregation: Taking into account the coverage area of the cell, users are going to be distributed, homogeneously among the grids (currently 150m x 150m or larger) associated with the cell, and the process is repeated for all cells. As we are assuming that the distribution of users in the coverage area of each cell is uniform, we are introducing an error/noise in the distribution of users by time interval, which will be transferred to population density predictions that contribute to reducing the risk of user reidentification. Each grid on the map can typically be served by several cells of different technologies and frequency bands. To obtain the number of users per grid and time interval, an aggregation is performed.
Output 5 โ†’ Number of Users per grid, based on distribution in the cells covering that area.

When and how the prediction of persons/users is done, based on the input (devices)

New wording agreed for step 2 & 3:

2. Attribution:ย A cell is associated with each user in each time interval.

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    1. For mobile lines with persistent records, the last cell in which each user has been connected in each interval (considering intervals of 15 minutes) will be associated.

    2. It is common to have intervals for which a user does not show activity, for them it will be assumed that the user remains in the same cell in which he was last seen active.

Output 2 โ†’ Valid Users per cell in each time interval

3. ย  ย Counting and Aggregation: A count of users is performed per cell and interval. On this count, a statistical analysis is performed with the elimination of outliers. Records associated with cells with less than K users in each time interval (k โ€“ anonymity) per km2 are discarded (to be evaluated according to local regulations).
Output 3 โ†’ Total number of Users connected per cell in each time interval, considering privacy.

Telefonica to provide feedback on these two topics to move on.

Status: Comments included and PR to be merged

AoB (4)

Next steps:

  • Meta release publication. After merging all the pending PRs, create r1.2

  • Create an issue to gather new scope for next release cycle

Discussion Summary

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Issue#12

Discussion onย APIย algorithm - Initial proposal

Closed and associated PR merged

Issue#35

Readiness checklist

Updated

Issue#37

Basic API Test Cases

Closed and associated PR merged

Issue#38

API Code commonalities validation

Validated, after #47

Issue#39

API documentation

Closed and associated PR merged

Issue#40

Area Data-type

ALL to provide feedback into commonalities issue

PR#25

Algorithm proposal

Merged

PR#44

API Test Plan draft proposal

All to review

PR#45

Create r1.2 PR (Meta M4)

Pending for final review and merging

PR#47

Align with Commonalities subscription model

Merged

Next steps

  1. Scope for next release โ†’ #15

  • Next call will be 25th September