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Training course O-RAN scheduler
- 2. OUTLINE • SCHEDULER INTRODUCTION • O-RAN SCHEDULER • FUTURE WORK
- 3. SCHEDULER
- 4. WHAT IS A SCHEDULER? • A mechanism of L2, which helps base station to allocate resource to users through scheduling algorithm. • It does scheduling according to report from users. (CQI, HARQ Ind.)
- 5. WHY SCHEDULER IS IMPORTANT FOR 5G NR? • Higher network efficiency – Resource Allocation – Higher Throughput – Higher Reliability – Lower Latency – Power Management
- 6. WHAT ARE THE CHALLENGES IN DESIGNING A SCHEDULER FOR 5G? • Intelligent and Efficient scheduling • Flexible and free designing platform (OAI, etc.)
- 8. WHAT DIFFERENT BETWEEN OAI AND O-RAN SCHEDULER? MAC SCH RLC MAC SCH RLC DU APP OAI architecture O-RAN architecture
- 9. WHAT IS THE ARCHITECTURE OF O-RAN SCHEDULER? • DL/UL Resource Scheduler: – This corresponds to functionality of time- domain and frequency domain scheduling in DL and UL, respectively. • DL/UL Link Adaptation (LA): – This functionality performs per UE Link Adaptation in DL and UL, respectively.
- 10. • UL Tx Power Control: – Performs Closed loop UL power control for PUSCH, SRS and PUCCH. • DL/UL MIMO Mode Control: – Determines per UE the MIMO mode, in DL and UL, respectively, to be used along with the corresponding precoding matrix. • Timing Advance (TA) Manager: – Estimating the TA Command for UE based on feedback from L1 using PUSCH, PUCCH and SRS.
- 11. O-RAN PROVIDES APIS FOR SCHEDULER • The APIs ensure any scheduler implementation interworks with MAC. This ensures the freedom of choice for OEMs and operators to plug in a scheduler implementation of choice from a third-party vendor in O-DU.
- 12. WHAT APIS ARE PROVIDED BY AN O-RAN SCHEDULER? MAC to SCH SCH to MAC Cell Configuration Request Cell (Re)Configuration Response, DL Broadcast Allocation Cell Delete Request Cell Deletion Response Add UE Configuration Request, Modify UE Configuration Request UE (Re)Configuration Response Delete UE Request UE Deletion Response Paging Indication Contents DL Paging Allocation
- 13. OTHER SCH TO MAC APIS • Scheduled Byte in DL/UL – SCH provides scheduling information for a given TTI for scheduling DL/UL data. • RAR Information – SCH shares the RAR and UL scheduling and Msg3 scheduling information with MAC. • DL Control Channel Information – SCH provides information for DCI scheduling on PDCCH to MAC. • DL Paging Allocation – SCH provides information for paging message on a paging channel to MAC.
- 14. FUTURE WORK
- 15. WHAT IS URLLC? • Low Latency (e.g., 1ms) and High Reliability (e.g., 99.999%).
- 16. WHY URLLC? • AR/VR • Healthcare • V2X • etc.
- 17. WHAT ARE THE CHALLENGES IN DESIGNING A SCHEDULER FOR SUPPORTING URLLC? • URLLC – For Reliability • Interference (Inter-cell Interference, etc.) • Channel State • Coverage • Packet dropping – For Latency • Transmission delay • Queueing delay • Processing delay • Retransmission
- 18. • Low-Complexity Hierarchical Joint Multi-Cell Scheduling Algorithm • Low-Complexity Heuristic Scheduling Algorithm
- 19. • Low-Complexity Hierarchical Joint Multi-Cell Scheduling Algorithm – Queueing delay user1 user2 user 3 user5 user4 CSI CSI CSI CSI CSI CSI CSI Cell 1 Cell 2
- 20. f t f t Cell 1 Cell 2
- 21. f t f t Cell 1 Cell 2 user 1 user 2 user 3 user 4 user 5
- 22. • Inter-cell Interference Scenario 1 Scenario 2
- 23. f t f t • Inter-cell Interference Management user1 user2 user5 user4 user3 X2 user 1 user 2 user 3 user 4 user 5
- 24. f t f t • Inter-cell Interference Management user 1 user 2 user 3 user 4 user 5 user1 user2 user5 user4 user3 X2
- 25. • Low-Complexity Heuristic Scheduling Algorithm – Multiplexing of eMBB and URLLC Services eMBB user3 eMBB user2 eMBB user1 URLLC user2 URLLC user1
- 29. f t 360kHz URLLC user 1 1080kHz URLLC user 2 180kH z
- 30. f t 360kHz URLLC user 1 900kHz URLLC user 2 180kH z Best SNR 180kH z
- 31. f t 360kHz URLLC user 1 900kHz URLLC user 2 180kH z 360kH z eMBB user 1
- 32. f t 360kHz URLLC user 1 URLLC user 2 180kH z 360kH z eMBB user 1 Best SNR 540kHz 180kH z
- 33. f t 360kHz URLLC user 1 URLLC user 2 180kH z 360kH z eMBB user 1 540kHz 180kH z eMBB user 2
- 34. f t 360kHz URLLC user 1 URLLC user 2 180kH z 360kH z eMBB user 1 540kHz 180kH z eMBB user 2 eMBB user 3
- 35. • Puncturing the resource of eMBB URLLC user3 +
- 36. f t 360kHz URLLC user 1 URLLC user 2 180kH z 360kH z eMBB user 1 540kHz 180kH z eMBB user 2 eMBB user 3 mini-slot URLLC user 3
- 37. f t 360kHz URLLC user 1 URLLC user 2 180kH z 360kH z eMBB user 1 540kHz 180kH z eMBB user 2 eMBB user 3 mini-slot URLLC user 3
Editor's Notes
- DL/UL Resource Scheduler Resource scheduling is performed per scheduling period and may be performed for a single slot or multiple slots. It may include functions such as beam selection, selecting of UEs and associated bearers per scheduling period, allocation of radio resources for PDCCH, PUSCH, PDSCH and associated channels like DMRS. DL/UL Link Adaptation (LA) LA would return effective MCS to be used for channel allocation to the UE.
- UL Tx Power Control It may estimate the UL Tx power based on UE feedback (eg: Power Headroom Report) or measured UL channels.
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz
- 15kHz 1 PRB = 1 slot x 180k Hz