MEC Sandbox Help

Platform Concepts

MEC Sandbox is an interactive environment that enables users to learn & experiment with ETSI MEC Service APIs. These standardized RESTful APIs are targeted towards MEC application developers to expose the value added services offered by MEC, including real time access to network and context information, as well as location awareness. The design principles for developing the APIs have also been specified in ETSI GS MEC 009, along with http methods, templates, conventions and patterns. The MEC service APIs are available in YAML and JSON format at https://forge.etsi.org, presented via OpenAPI compliant descriptions.

MEC Sandbox provides the user with a choice of scenarios combining different network technologies (4G, 5G, Wi-Fi) and terminal types. Combining these assets in a geolocated environment, a user can gain hands-on experience on the behavior and capabilities of the Location (MEC013), Radio Network Information (MEC012) and WLAN Information (MEC028) service APIs. Such contextual information can offer significant differential performance for edge based MEC applications.

Web UI

MEC Sandbox Portal is a single page web application that provides an interactive interface; once signed in, it allows a user to experiment with an individual sandbox.

The home page provides:

• A brief description of the platform
• Links and references to learn more about ETSI MEC
• Control to:
  • Navigate through the MEC Sandbox pages
  • Open the help menu to get started or access this wiki page
  • Sign in to the platform

When a user signs in, the MEC Sandbox creates the necessary backend resources and opens a user-specific sandbox dashboard that allows to:

• Deploy pre-defined network scenarios in the city of Monaco
• Configure terminal devices within the network (add/remove/pause)
• Experiment with the MEC Service APIs by opening a MEC client directly in the browser
• Alternatively, experiment MEC Services directly from an external application (your own or a third party application)

In both cases, MEC Sandbox APIs respond according to the current state of the network scenario.

More details about the MEC Sandbox UI are provided in the platform usage section of this wiki.

Terminology

Point of Access (POA)

A point of attachment to access a network; MEC Sandbox networks supports 4G, 5G and WiFi POAs.

• Each POA has coverage range within which a terminal may attach to the network.
• The PoA range is represented by a circle and its the range varies depending on the network technology
• Both the PoAs and their associated range can be shown or hidden by selecting the appropriate layers on the map.

User Equipment (UE) / Terminal Device

A end user devices equipped with a wireless radio that allows to connect to a PoA.

• MEC Sandbox supports three types of UEs; stationary, low-velocity and high-velocity
  • UE types are described in more detail in this wiki section.
• Number of UEs present in a scenario can be configured
• Each UE has an associated velocity and path that defines how they move on the map; these are fixed in a scenario.
• UEs have their preferred access network types with their preferred order of connection
• Preferred connectivity order is (1) WiFi, (2) 5G and (3) 4G
• The default UE behavior is to remain connected to a POA as long as it is in range unless a higher priority network access becomes available.

Zone

A zone is a logical grouping of one or more PoAs, irrespective of their wireless technologies.

• On the map, zones are represented by using color coding.
• The definition of zones help structure the network.
• MEC Location Service (MEC013) can be used to discover zones or UEs present in a zone.

Network Scenario

A network of geo-located UEs and POAs that are grouped in Zones.

• One network scenario can be deployed at a time in a MEC Sandbox instance.
• At any time a user can terminate a scenario or select a new one without requiring to re-create a new sandbox.
• While a network scenario is deployed, requests can be sent to the MEC Service APIs which will return a response
• MEC Services may also generate notifications depending on the subscriptions created by the user
• Both responses and notifications reflect the state of the network at the moment they were generated

Network Scenarios

MEC Sandbox currently provides three network scenarios with different assortments of technologies. These scenarios were designed to simulate an urban environment using a single mobile network operator with combinations of 4G, 5G and WiFi PoAs.

UEs move along their pre-defined path, triggering changes in connectivity and in MEC Service outputs (responses & notifications).

The city of Monaco was chosen as the simulated location.

Networks

MEC Sandbox provides the following networks

Networks	Positions in the city
4G Macro Network Contains 10 4G-PoAs grouped into 4 different zones; together, these PoAs cover the entire Monaco area
4G-WiFi Macro Network Builds on 4G Macro Network by adding 11 WiFi-PoAs distributed throughout the city
4G-5G-WiFi Macro Network Builds on 4G-WiFi Macro Network by adding 19 small cell 5G-PoAs distributed throughout the city

UE Types

UEs are divided into the following categories:

UE Type	Locations and paths of UE's
Stationary UE They have a static geo location They represent smart city IoT connected devices such as street cameras, smart sensors, etc.
Low Velocity UE They change location relatively slowly They represent leisure cyclists or pedestrians moving through the city
High Velocity UE They change location quickly They represent motorized vehicles moving along the main city roads

The number of UEs in a network scenario is dynamically configurable, however the positions and paths are the same for all scenarios.

MEC Services

MEC012 - Radio Network Information Service (RNIS)

MEC Sandbox supports version v02.01.01 of the MEC012 specification, available on ETSI website

RNIS provides cellular radio network information to edge applications, such as:

• Radio network conditions
• Measurements related to user plane
• Information about UEs connected to the radio network (context, Radio Access Bearers (RAB))
• Notification events such as cell change, RAB establishment and RAB release

MEC Sandbox supports a subset of RNI API endpoints and subscription types; for more details on the supported endpoints access the SwaggerUI client in a MEC Sandbox.

MEC013 - Location Service

MEC Sandbox supports version v02.01.01 of the MEC013 specification, available on ETSI website

Location Service provides geospatial and network location information to edge applications, such as:

• Location information related to user and zones
• Notification events such as user tracking, zonal status or traffic

MEC Sandbox supports a subset of the Location API endpoints and subscription types; for more details on the supported endpoints access the SwaggerUI client in a MEC Sandbox.

MEC028 - WLAN Access Information Service (WAIS)

MEC Sandbox supports version v02.01.01 of the MEC028 specifications, available on ETSI website

WAIS provides WLAN radio network information to edge applications, such as:

• Access point conditions
• Information about terminals connected to the network
• Notification events such as terminal connectivity

MEC Sandbox supports a subset of the WAI API endpoints and subscription types. for more details on the supported endpoints access the SwaggerUI client in a MEC Sandbox.

Usage

The following section provides MEC Sandbox usage guidelines.

Sign In

The MEC Sandbox home page provides a Sign In button to initiate a user session. When clicked, the user is prompted to authenticate with one of the following external OAuth 2.0 providers: GitHub: Sign in with a public GitHub account GitLab (ETSI): Sign in with an ETSI-On-Line (EOL) GitLab account To successfully sign in to the MEC Sandbox, the user must have a valid account with one of the above providers, must successfully sign in, and must accept an authorization request for access to public profile information. Once signed in and after successful backend resource allocation, the user is redirected to the MEC Sandbox dashboard. NOTE: External OAuth provider login and authorization may be seamless if they have already been performed

MEC Sandbox Dashboard

The dashboard is the main screen of the MEC Sandbox; it is divided in 4 main areas that are explained below:

• Map area: Observe physical assets on the map
• Configuration area: Select networks and UEs
• API Console: Investigate MEC API communication
• Try-it area: Details about accessing MEC Service APIs

Area	Representation
Map Area Map area allows to observe the location of different assets; it provides the following information and capabilities: Zoom control Layer selection - display or hide assets PoAs Icon shows the type of PoA (4G/5G/WiFi) Clicking provides details PoAs are color coded according to their zone Circle surrounding the PoA represents the signal range - also color coded to the zone UEs Icon shows UE type (stationary/low/high velocity) Clicking provides details UEs are red when disconnected, blue otherwise
Configuration area Configuration area allows dynamic configuration of the MEC Sandbox; it provides the following capabilities: Network selection - deploy/terminate network scenarios Pause terminal movement - dynamically start/stop UE movement Set the number of terminals - dynamically add/remove UEs by type
API Console API console displays a table of real-time requests and notifications that the MEC Service APIs receive and generate. The table provides a summary of the communication messages, including type (request/notification), service involved, endpoint, HTTP method, time and response code. Requests are HTTP messages received by the MEC Service Click on the request line in the table to see the response returned by the MEC Service Notifications are HTTP message sent by the MEC Service These are generated only if a subscription was created in the MEC Service Click on the notification line in the table to see details about notification and received response
Try-it area Try-it area provides information on how to access a specific MEC Service API in the MEC Sandbox; a drop down allows to select the desired MEC API. Note: MEC Services are always running (from MEC Sandbox creation); selecting a MEC API only changes the displayed information in the dashboard Try-it in the browser allows to launch a SwaggerUI client for the selected MEC API; from the client a user can send requests to the MEC Services. Try-it from your MEC application provides the link to use to reach the selected MEC API from an external application. Note: the provided link needs to be provisioned in an application client to access the MEC Service running in the sandbox.

Swagger UI

The Swagger UI client is a powerful tool to learn about MEC APIs as it provides curated & browsable information about the API endpoints - but it also serves as an API client allowing to send requests and observe responses.

The figure on right shows Swagger UI for the MEC Location Service. A header provides API name and details with links to related specifications The client is configured to communicate with your own sandbox API endpoints are listed along with their HTTP verb - clicking on an endpoint provides more details
The figure on right shows the documentation details available at the endpoint level: A description of the endpoint Parameters that may be required when invoking the endpoint Possible responses that the endpoint may return The Try it out button enables the client mode
The figure on right shows how a request can be sent to the MEC service running in the MEC Sandbox. After clicking Try it out, the documentation page changes as follows: The parameters area allows to enter values if required; in this example, no parameters are needed An Execute button appears; clicking sends the request to the MEC API An informational window shows the request and parameters sent using the curl command Note that this command can be copied and sent from a Command line terminal The server response area shows the values received from the MEC Service API Responses can be downloaded

MEC Application

MEC Application developers can access MEC Services running in the MEC Sandbox using the base path URL provided in the Try-it area of the Sandbox dashboard. This link routes requests for the selected MEC API to a specific user sandbox.

NOTE: Any external application or process with HTTP client capabilities and access to the MEC Sandbox can be used to send requests to the MEC Services

MEC applications must use the provided link as a base path for API requests and must append the desired endpoint path. MEC applications must also provide path, query and body parameters when necessary. For more details on the supported endpoint paths and parameters, access the Swagger UI client in a MEC Sandbox.

For notification subscriptions, MEC applications must provide notification URLs where MEC Service notifications should be sent. If a notification URL points to a publicly accessible endpoint, the API Console will show the request and response data and codes; otherwise, the request will fail and the API console will display a 500 Internal error.

Examples

Work in Progress