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Architecture introduction

Overall architecture (not component-specific)

Installing the near-RT RIC

Outdated: Bronze release (Jun-21-2020) Getting Started → Near Realtime RIC Installation (but similar sequence is used in Cherry and Dawn)

Generally the latest instructions: https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-ric-dep/en/latest/ → Installing Near Realtime RIC in RIC Cluster

There's a demo video which shows how to deploy the near-RT RIC, connect an E2 node (gNB simulator) to it and how to deploy an xApp using the DMS CLI: 2021-11-05 Demo video release Dawn

List of Dawn release docker images: Near-RT RIC (D release). Old list of cherry docker images: Near-RT RIC

Guides

An example xApp using the Golang xApp framework: link and the xApp_Writer_s_Guide_v2.pdf

Also check the "md" files in the base directory of many of the RIC repositories by name in gerrit.

Also check the currently still somewhat empty information in readthedocs

Xapp frameworks in general: see item with same name "Xapp frameworks in general:" in the "external interfaces" section below.

External interfaces

The RIC platform has the following external interfaces

E2:

(2021-12-08) implementing all of E2APv1.1 (since E release), but see exception list below. Up to the D release (incl. D) we supported E2APv1.0. Note that E2APv1.1 is backwards compatible to E2APv1.0. So you can still connect with E2APv1.0 E2 nodes to the RIC. E2APv1.1 added three capabilities on top of E2APv1.0

  • OID support in function definitions (RIC-640, implemented in E),
  • configuration transfer capabilities (RIC-638, not in E (existing partial implementation will be further developed in F),
  • support for multiple TNL associations (RIC-639, no concrete plan to implement)

Also no support for RIC-784 (timer handling in E2 control messages), RIC-785 (error indication handling), RIC-783 (support for control ack to selected xapps) and no E2 Reset (RIC-386+RIC-387).

In the F release we plan to support E2APv2.0 with the same level of functionality as in the E release, i.e., no implementation for the additional capabilities in E2APv2.0.

Note that the RIC platform is generally independent of E2SMs (E2 service models) and E2APv1.0, 1.1, 2.0 work with the various E2SMs as there are no dependencies.

Xapp Frameworks
SDL API

https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-sdl/en/latest/user-guide.html

O1:
  • Support for netconf "Hello exchange" (incl. capability exchange)
  • Alarms as VES events as per RIC Alarm System
  • get E2 stats (on number of packets over E2) via the path E2T->Prometheus->VESPA→(ONAP). Requires setting the environment variable VESMGR_PLT_CFG_FILE which contains the VESPA mapping for this path: Prometheus->VESPA
O2:

Support for O2 use case "Deploy xApp in near-RT RIC" in WG6's O-RAN orchestration use cases v2.0. This is done as per the CLI that is in this commit https://gerrit.o-ran-sc.org/r/c/ric-plt/appmgr/+/5816 

A1:

(2021-05-25) Support for A1-Policy and A1-EI as per A1APv3.0 and A1APv3.1. Note that the A1 mediator in the RIC platform is independent of A1TD (A1 type definitions) and passes them as opaque blobs to xApps.

Others

RMR: Check the read-the-docs page: https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-lib-rmr/en/latest/rel-notes.html Additionally you might read RIC Message Router (RMR)

Subscription manager: https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-submgr/en/latest/user-guide.html and REST API: link

Xapp onboarding and deployment: check section "RIC applications" in https://docs.o-ran-sc.org/projects/o-ran-sc-it-dep/en/latest/installation-guides.html#ric-applications on how to use the dms_cli to onboard and deploy xApps. Onboarding is the act of generating a Helm chart for the xApp from the its xApp descriptor. Using the generated helm chart (which is specific to a particular RIC instance) the xApp can be deployed.

Generally check the read-the-docs pages: https://docs.o-ran-sc.org/en/latest/projects.html#near-realtime-ran-intelligent-controller-ric




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