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Multiple DRB Support

Angelo Athanassopoulos requested to merge nr_multiple_drbs into develop

Multiple Data Radio Bearer support.

It creates DRBs based on the 5QI. If the 5QI is a GBR Flow, it assigns a dedicated bearer, else if it is a Non-GBR flow it uses one DRB, per PDU Session.

We can establish custom DRBs from the configuration file, and they will be treated like they are GBR flow. But they should only be used for testing purposes.

Currently, there is a limitation to 4 DRBs. It should be further looked into, to figure out which parts of the code causes this.

Edited by Angelo Athanassopoulos

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