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Please first read the A1 overview: A1 Mediator

RMR Communication

See https://rancodev.atlassian.net/wiki/spaces/RICPLT/pages/60784719/RIC+message+types

A1 to Xapps

When A1 sends a message to xapps, the schema for messages from A1 to the xapp is defined here: https://gerrit.o-ran-sc.org/r/gitweb?p=ric-plt/a1.git;a=blob;f=a1/openapi.yaml;h=fed4b77546264cc8a390504dae725ca15060d81a;hb=97f5cc3e3d42e1525af61560d01c4a824b0b2ad9#l324

All policy instance requests get sent from A1 using message 20010

Xapps to A1

There are three scenarios in which Xapps are to send a message to A1:

  1. When an xapp recieves a CREATE or UPDATE message for a policy instance. Xapps must respond to these requests by sending a message of type 20011 to A1. The schema for that message is here: https://gerrit.o-ran-sc.org/r/gitweb?p=ric-plt/a1.git;a=blob;f=a1/openapi.yaml;h=fed4b77546264cc8a390504dae725ca15060d81a;hb=97f5cc3e3d42e1525af61560d01c4a824b0b2ad9#l358
  2. Since policy instances can "deprecate" other instances, there are times when xapps need to asyncronously tell A1 that a policy is no longer active. Same message type and schema. The only difference between case 1 and 2 is that case 1 is a "reply" and case 2 is "unsolicited". 
  3. Xapps can request A1 to re-send all instances of a type using a query, message 20012. When A1 recieves this (TBD HERE, STILL BE WORKED OUT)



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