.. This work is licensed under a Creative Commons Attribution 4.0 International License. .. http://creativecommons.org/licenses/by/4.0 API-Docs ********** This is the API-docs for D relase o-du/l2. .. contents:: :depth: 3 :local: Introduction ----------------- This document lists the APIs implemented between various modules of ODU-High and their functionality. These are in line with ORAN-WG8.AAD-v3.00.00, hereafter referred to as AAD Spec. API Functions ------------- 1. RLC-MAC Interface - AAD Spec : section 9.2.1 A. RLC to MAC a. Data Transfer(DL) : Transfers DL data to MAC as per Section 9.2.1.1 of the AAD Spec b. Buffer Status Reporting(DL) : Reports DL data volume pending in the RLC entity, as per Section 9.2.1.4 of the AAD Spec B. MAC to RLC a. Data Transfer(UL) : Transfers UL data to RLC as per Section 9.2.1.2 of the AAD Spec b. Schedule Result Reporting (DL) : Reports DL schedule result to RLC as per Section 9.2.1.3 of the AAD Spec 2. MAC-Scheduler Interface - AAD Spec : section 9.2.2 A. MAC to Scheduler a. Air Interface Time : Sends timing information over air interface in terms of SFN and slo, as per Section 9.2.2.1.1 of the AAD Spec b. Cell Configuration Request : MAC provides SCH the cell configuration as per Section 9.2.2.2.1 of the AAD Spec c. Add UE Configuration Request : MAC provides SCH the configuration/capabilities of a UE as per Section 9.2.2.2.3 of the AAD Spec d. Modify UE Reconfiguration Request : MAC provides SCH the re-configuration of UE, also used to add/release/modify existing bearers, as per Section 9.2.2.2.4 of the AAD Spec e. RACH Indication : MAC receives the RACH Indication and share the contents with SCH as per Section 9.2.2.2.10 of the AAD Spec f. DL RLC Buffer Status Information : Reports data volume per LC when it is received at MAC as per Section 9.2.2.2.14 of the AAD Spec g. UL Buffer Status Report Indication : On reception and decoding of received BSR from the UE, MAC provides SCH buffer status report for UL scheduling, as per Section 9.2.2.2.16 of the AAD Spec h. UE Delete Request : MAC receives UE delete request and forwards the request to SCH as per Section 9.2.2.2.5 of the AAD spec. i. Cell Delete Request : MAC receives UE delete request and forwards the request to SCH as per Section 9.2.2.2.2 of the AAD spec. B. Scheduler to MAC a. Cell Configuration Response - Response to cell configuration request from MAC, as per Section 9.2.2.3.1 of the AAD Spec b. UE Reconfiguration Response - Response to UE reconfiguration request from MAC, as per Section 9.2.2.3.3 of the AAD Spec c. DL Scheduling Information - Provides scheduling information for a given slot for downlink data, as per Section 9.2.2.3.5 of the AAD spec. d. UL Scheduling Information - Provides scheduled information for MAC to form the UL_TTI.request towards O-DU Low, as per Section 9.2.2.3.6 of the AAD Spec. e. RAR Information - Informs MAC of uplink scheduling and Msg3 scheduling information, as per Section 9.2.2.3.7 of the AAD Spec. f. Downlink Control Channel Information - Provides DCI scheduling information for a given slot on PDCCH, as per Section 9.2.2.3.8 of the AAD Spec g. Downlink Broadcast Allocation - Provides DCI and DL data scheduling information for SIB1 for a given slot for Broadcast Channel, as per Section 9.2.2.3.9 of the AAD Spec. h. UE Delete Response - Response to UE delete request from MAC, as per Section 9.2.2.3.4 i. Cell Delete Response - Response to Cell delete response from MAC, as per Section 9.2.2.3.2 3. DU APP - MAC Interface - AAD Spec : section 9.2.3 A. DU APP to MAC a. Cell Start - Commands MAC to start cell at L1 and to start broadcasting system information, as per Section 9.2.3.1 of the AAD Spec. b. UE Create Request - Adds UE information at MAC as per Section 9.2.3.3 of the AAD Spec. c. UE Reconfiguration Request - Reconfigure UE information for a UE already added at MAC, as per Section 9.2.3.5 of the AAD Spec. d. DL CCCH Indication - Sends DL CCCH Message to MAC to be sent to UE, as per Section 9.2.3.16 of the AAD Spec. e. Cell Stop - Commands MAC to stop cell at L1, as per Section 9.2.3.2 of the AAD spec. f. UE Delete Request - Deletes UE information at MAC as per Section 9.2.3.7 of the AAD Spec. B. MAC to DU APP a. UE Create Response - Response to UE Create Request from DU Manager as per Section 9.2.3.4 of the AAD Spec. b. UE Reconfiguration Response - Response to UE Reconfiguration Request from DU APP as per Section 9.2.3.6 of the AAD Spec. c. UL-CCCH Indication - Sends the UL CCCH Message received from UE to DU APP as per Section 9.2.3.15 of AAD Spec. d. UE Delete Response - Response to UE Delete Request from DU Manager as per Section 9.2.3.8 of the AAD Spec. 4. DU APP - RLC Interface - AAD Spec : section 9.2.4 A. DU APP to RLC a. UE Create - Adds UE associated RLC entity and related information as per Section 9.2.4.1 of the AAD Spec. b. UE Reconfiguration - Reconfigures the UE associated RLC entity previously added at RLC, as per Section 9.2.4.3 of the AAD Spec. c. DL RRC Message Transfer - Requests RLC to deliver RRC message from CU to the UE, as per Section 9.2.4.7 of the AAD Spec. d. UE Delete Request - Deletes UE associated RLC entity and related information as per Section 9.2.4.5 of the AAD Spec. B. RLC to DU APP a. UE Create Response - Response to UE Create Request from DU APP, as per Section 9.2.4.3 b. UE Reconfiguration Response - Response to UE Recofiguration Request from DU APP, as per Section 9.2.4.4 c. UL RRC Message Tranfer - Delivers RRC Message from UE to CU as per Section 9.2.4.8 of the AAD spec. d. RRC Message Delivery Report - Informs DU Manager on failed/successful delivery of a DL RRC message to UE, as per Section 9.2.4.9 of the AAD Spec. e. UE Delete Response - Response to UE Delete Request from DU APP, as per section 9.2.4.6 Additional APIs ---------------- 1. DU APP - MAC Interface A. DU APP to MAC a. Cell Configuration Request - Configures cell information at MAC b. Cell Delete Request - Deletes cell information at MAC B. MAC to DU APP a. Cell Configuration Response - Response to Cell Configuration Request from DU APP b. Cell Delete Response - Response to Cell Delet request from DU APP 2. DU APP - RLC Interface A. RLC to DU APP c. DL RRC Message Response - Informs DU APP if a DL RRC Message was successfuly processed at RLC and sent to MAC. 3. DU APP - O1 Interface a. Bring cell up - Informs DU to bring a specific cell up b. Bring cell down - Informs DU to bring specific cell up c. Set the cell operational state - Sets the cell state to ACTIVE/INACTIVE d. Raise a cell alarm - Raise an alarm when the cell is ACTIVE/INACTIV