4. NB_MAC_Module_List - This document is mainly descrbing about the difference beween MAC in LTE and NB-IoT from 3gpp specification.
5. NB_MAC_SAP - This document is mainly describling about the Service Access Point (primitives) between the MAC and other layers in OAI.
6. NB_MAC_Fapi_interface - This document is mainly for the FAPI style interface between OAI MAC and PHY for NB-IoT, and described how old messages in OAI go through in the FAPI style interface.
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